Buggy Speedometer
S.K. Brown
Take a look at various models of bicycle speedometers, some can be
calibrated down to 12".
I have a CCM 8 function Cyclocomputer, cost ~ $15.00 Canadian. It
handles 16" wheels.
Use a flexible tape measure to find the wheel circumference, look up how
to calibrate that size to your speedo. It doesn't take to long to do it,
sort of like programming a digital watch.
The hard part is mounting the sensor magnet, unless you have the old
style spoked wheels. I drilled a hole in the sensor magnet housing and
threaded it onto the inner tube's valve stem. Then I mounted the sensor
unit onto the front fork, aligning everything carefully.
Trial & error 'til it works is the method.
Good luck,
Steve
Stinginit
have done so recommend? I see that most of the bicycle units are adjustable for
various wheel sizes, all of which are larger than the 16" buggy wheels. Is
calibration a problem?
Thanx,
Vince
Stin...@aol.com -V. Bobrosky
AhClem0013
In article <19990223000644...@ng-fz1.aol.com>, stin...@aol.com
(Stinginit) writes:
>I would like to put a speedo/odometer on my buggy. What would those of you
>who
>have done so recommend? I see that most of the bicycle units are adjustable
>for
>various wheel sizes, all of which are larger than the 16" buggy wheels. Is
>calibration a problem?
The biggest problem i found was the addictive nature of the beast. While they
work, they are great, but they allways seem to break! Calibration is not a
problem if you get one that goes down that small. I'm going back to Wallyworld
to get another one for the upcoming SBBB and see what the prices are like.
Make sure you mount the read out where it will not smash if your buggy turns
upside down. A 35 mm film canister can be used (in place of the handlebar it
was designed to fit on) and zip-tied in place on your top bar below the point
where it will strike the ground. 2 part epoxy works good for securing the
magnet, the rest bolts on the buggy just like a bike.
I think we put more strain on them than what would be found on a bicycle. A
solution would be to remove the unit when you go off road, but often what
breaks is the connection to the sending unit. I've had no success fixing this
as the wire is quite small.
Make sure you measure your wheel at the air pressure you run it at, as the
difference is noticble for sure. Good luck.
Will we see you at SBBB? Any other's coming not on my list? I'll publish the
list soon, we have quite a group coming and racing will be happening most days
as well, not to mention bar b que and other fine fun filled events.
I hear a hunt for Cobey's magic rock will take place later in the week.
total AoxomoxoA brought to you by. . .
. . . dean jordan
please buy * jordan air kites * every chance you get!
13
Gene Matocha
> I would like to put a speedo/odometer on my buggy. What would those of you who
> have done so recommend? I see that most of the bicycle units are adjustable for
> various wheel sizes, all of which are larger than the 16" buggy wheels. Is
> calibration a problem?
>
Two workable Speedos I have found are the Avochet and the Trek...they both can
calibrate to 16" wheels (about 1240mm). However, after replacing two Avochet's (no
crashes - they just stopped working), the guy at the bike shop told me they have
battery case problems, and a very high failure rate. So high that he no longer
carries them.
I have yet to find one with a really nice large display, however. On a bike you are
much closer to the speedo, but for a buggy I would like a slightly larger display.
If anyone knows of one that works w/ buggys, please let me know.
Good Luck!
Coreykite
Works great for me.
I believe it is the C-20 model.
I use a piece of pvc tubing instead of a film can.
Sturdier and easy to mount on the down tube with a lock-tie.
Diplay failure is usually just the battery running out...
in my experience.
There are many models out there...
getting a good one for less than $25 is how to win the game.
One needs at least a 5 function model to acquire the needed functions:
Speed, trip odo, top speed memory, ride time, average speed...
The clock is needed for the average times to work...
the top speed memory is the feature not
usually available on cheaper models...
Mounting the magnet is easy...
Just use a dab of GOOP to adhere the magnet to the rim...
the magnet comes off if you change wheels too...
The pickup mounts to the fork leg...
Put the magnet on the opposite side of the rim
from the valve stem so there is no interference.
Calibration number for standard wheels and tires is 1224
(So shoot me if i'm wrong)
At least all this has worked beautifully for me.
aoxo core...@aol.com
Jean Lemire
Your number of 1224 compute to an outside diameter of 15.34 inches for your
tire. That looks ok if the standard buggy wheels are about 16 inches in
diameter.
For the curious (I dont buggy but I have such a speedometer on my bicycle)
these devices are often calibrated by entering the outside tire
circumference in millimeters.
So, if your tire diameter (D) is exactly 16 inches, for example, this gives
a circumference (C) of 50.27 inches or 1277 mm.
C = D * pi
pi = 3.1416
mm = inch * 25.4
BTW dont bother measuring the diameter. Using a piece of chalk (or
whatever), draw a mark on your tire. Place the tire so the mark is on the
bottom or six o'clock position (tangent point with the floor). Make a mark
on the floor in line with the tire mark. Roll the tire straigth so that the
mark comes again to the same six o'clock position. Make another mark on the
floor. Measure the distance between the two marks and you have the
circumference. Measure it in mm if you have such a ruler or tape and you
have the required number to adjust your speedometer. Better yet, roll the
buggy with the pilot in to take into consideration the tire deformation
caused by the pilot weigth. Dont laugh, a change of 1/8 inch (3 mm) caused
by the pilot will cause a difference of about 1.5 % on the distance
indicated and so on the speed.
OK you may laugh now, you probably dont need that kind of precision.
Do I have time to loose : yes a little :-)
Do I have fun doing that : yes a lot :-)
Good calibrating and buggying folks. And remember. Dont buggy and drink,
you migth hit a bump and spill some liquid :-)
Wind or no wind, fly for fun.
Jean (Johnny) Lemire of team S.T.A.F.F. from Montreal, Canada.
PirminAlan
comps. mounting these buggers with clear silicon glue found all aross this
globe will suffice. we've mounted comps using only this goo to vast success.
makes for clean and simple installs. wet finger then wipe off excess goo,
leaves a smooth almost polished finish to mount. also the silicon acts as
dampner for the "rough" rides. hope that helps.
Charles Ernest Hemingway : trout bum, wannabe kite flyer
"rise again damn trout"
Bob Pebly
manufacturers, here are the wireless models where I could get confirmation that
16" wheels are supported.
- CatEye Cordless 2 (avail from Bike Nashbar)
- all Vetta models
Some reading in the cycling newsgroups reveals a lot of quality complaints with
the Vetta models.
Bob
Stinginit wrote in message <19990223000644...@ng-fz1.aol.com>...
>I would like to put a speedo/odometer on my buggy. What would those of you who
>have done so recommend? I see that most of the bicycle units are adjustable for
>various wheel sizes, all of which are larger than the 16" buggy wheels. Is
>calibration a problem?
>
Steve Bateman
>
> I would like to put a speedo/odometer on my buggy. What would those of you who
> have done so recommend? I see that most of the bicycle units are adjustable for
> various wheel sizes, all of which are larger than the 16" buggy wheels. Is
> calibration a problem?
The *best* speedo for bikes, as well as buggies is
the Enduro 2. I have one for my bike and one for
my buggy.
Heavy duty wire, dual tire settings, resettable odo, max
speed, dual trip meters, etc.
--
Steve Bateman geokite at sprintmail dot com
7.0m 1st gen. Chevron buggy kite, Icarex+spectra, $175+shipping
The best health info is at http://www.healthcentral.com
JEB1954
Many have advised to measure the tire for the circumference, but no one has
suggested to put your weight on the buggy to make it accurate. I ride many
miles a year on a couple of bikes and my bike computers are as accurate as any
that I know of. (yes, I've checked) I make a mark the sidewalk in relation to
the valve stem on the tire that the sensor and magnet use. Get on and roll it
for ten tire revolutions. Make another mark on the sidewalk where the valve
stem comes down on the tenth revolution. Measure the distance. Convert this
measurement to millimeters (or centimeters, if that is what your computer
uses.) Divide by ten. Input this figure into the computer using the
calibration instructions for your computer.
I realize that this is more accurate than most people need, especially on the
dirt. but if you just measure for one revolution (and don't divide by ten) Be
sure to put your weight on the buggy (or bike) for accuracy.
hope this helps
Jerry
Stinginit
No,,,,,,,,, I won't be making to SBBB,,,,,,,long story.... :(((( I will be
going to Elmer in May for BBT and hopefully again to one in the fall.
Have a good time at SBBB!!!!!!!
Vince
Stin...@aol.com -V. Bobrosky
Peter de Jong
<krus...@seaside.net> wrote:
>Hi Vince,
>
>Take a look at various models of bicycle speedometers, some can be
>calibrated down to 12".
>
>I have a CCM 8 function Cyclocomputer, cost ~ $15.00 Canadian. It
>handles 16" wheels.
>
>Use a flexible tape measure to find the wheel circumference, look up how
>to calibrate that size to your speedo. It doesn't take to long to do it,
>sort of like programming a digital watch.
>
Hoi
A better way is to make a mark on your wheel, and sitting in your
buggy move it 10 revolutions forward. Measure the distance and divide
by 10.
Much more accurate.
Regards, Peter
Peter de Jong <p...@xs4all.nl>
A&F Custom Kites Werkhoven NL
For kitebuilding tips: <http://www.xs4all.nl/~pdj>
Coreykite
Pumped up the tires...
Sat in the buggy...
rolled it out 10 revolutions
did the math...
Once, speeding across elmer's garage,
in the company of a self-proclaimed speedster...
after a quick 34-35 mph run...
he pulled up and loudly touted his 55 mph record!!!
*No Way* I retorted, *That was only 35!*
Just then Steve Bateman (reknowned buggyer and Very Honest Guy)
rolled up. He had started trailing us and then had passed us midway throught
he run... *How fast did ya go?* I hollered
*Nearly 40!* He responded...
*See!* I yelled... No way that was 55!*
So I started pushing buttons on the braggarts cyclocomputer...
and found he had calibrated it for a 26 inch tire...
Or rather, as he claimed, just left it where it was
when he bought it.
The rest of the afternoon was spent buggy
across the bays and pucker bumps
of elmer's garage... to the accompanying laughter
of the assembled rude crew.
55 my ass.
aoxo core...@aol.com
AhClem0013
In article <19990224142832...@ng-fq1.aol.com>, core...@aol.com
(Coreykite) writes:
>55 my ass.
He wouldn't as i recall, have known what to do with 55! That's fast even for
Dave Town! Shoot, that might even be fast for Andrew.
All this talk about speedo's makes me want one. Now why did y'all have to go
and do that for?!?
Tom McAlister
> A 35 mm film canister can be used (in place of the handlebar it
> was designed to fit on) and zip-tied in place on your top bar below the point
> where it will strike the ground.
I have always used the largest hexagonal bolt I could find instead of a film canister.
I like using a bolt because the flat side of the bolt mounts solidly to the up-tube with a simple
pipe clamp. I usually but a wrap bit of innertube rubber between the clamp and the up-tube. It acts
as a kind of gasket which prevents the pipe clamp from damaging the up-tube.
Have fun,
Tom
--
/ Tom McAlister \
/ Highline Kites of Berkeley \
/ Home of the Berkeley Kite Festival & WCKC \
\ Visit our Store at http://www.HighLineKites.com /
Morrie & Kelci Williams
>
>In article <19990224142832...@ng-fq1.aol.com>, core...@aol.com
>(Coreykite) writes:
>
>>55 my ass.
>
>He wouldn't as i recall, have known what to do with 55! That's fast even for
>Dave Town! Shoot, that might even be fast for Andrew.
>
I've clocked 45-46 before and my eyes were as big as dinner plates. I
can't imagine what a real 55 would feel like!
>All this talk about speedo's makes me want one. Now why did y'all have to go
>and do that for?!?
>
It's just another toy to have on your buggy. It doesn't really mean
anything to anyone but you! It gives you a relative reading of your
kite/buggy's performance.
>
> total AoxomoxoA brought to you by. . .
> . . . dean jordan
>please buy * jordan air kites * every chance you get!
> 13
See you all at Ivanpah in 10 days.
Morrie
==========================================================================
Morrie & Kelci Williams Buggy NorthWest Buggy Pilots Assoc.
Westport, WA, USA or Washington Kitefliers Assoc.
Internet : will...@techline.com Die!!! American Kitefliers Assoc.
michael m. moss
many years on my mountain bike without any failure even with way too
many crashes to count a(gott love learning to love those new clipless
pedals) maybe they dont make it anymore. I've kinda thought about
putting it on my buggy, but seldom get to 1)get into and move the thing.
and 2) stay in the thing once moving.
but will continue trying. ;-)
Just me
Mikey luvs ya!
Bob Pebly
AhClem0013 wrote in message <19990224163545...@ngol07.aol.com>...
>All this talk about speedo's makes me want one. Now why did y'all have to go
>and do that for?!?
>
>
> . . . dean jordan
>please buy * jordan air kites * every chance you get!
> 13
Dean in a pair of speedo's, now there's a scary thought! Oh, wait, you meant
speedometer...
;-)
Terry GizmoGerweck
(Morrie & Kelci Williams) wrote:
>
> See you all at Ivanpah in 10 days.
>
Absolutely NO FAIR! I gotta wait 13 days ;-(
See ya
Terry "Gizmo" Gerweck
TEDSFOILS
let me know before I leave. I will be arriving the 10th.
Ted Dougherty http://members.aol.com/tqkites
Designer of the Original Quadrifoil, Sparless Stunter, Quad-Trac, Quad-Trac
Pro, Quadraflex2, etc.
Stay tuned for the newest in traction kiting only by Ted Dougherty and feel
free to pass the word.
AhClem0013
In article <19990224232834...@ng-fr1.aol.com>, teds...@aol.com
(TEDSFOILS) writes:
> I will be arriving the 10th.
Whoooeeee!!! You gonna race Ted?? C'mon, are you???? Beat you to the fence
and back, give you a half a length! Travo, you in? Invisible Dave wanna go?
Hey DT, tiger boy, what up? and those boys from Oklahoma. . . shoot, and we
always get someone there for their first time. Kieth is gotta be there. Dave
Lord with a mast! Fritz to fast. . . . and you never know, Dodd could
surprise us all.
ahh, it's making me sick, i don't know if i can wait any longer.
DAFkite
>
> In article <19990224142832...@ng-fq1.aol.com>, core...@aol.com
> (Coreykite) writes:
>
> >55 my ass.
>
> He wouldn't as i recall, have known what to do with 55! That's fast even for
> Dave Town! Shoot, that might even be fast for Andrew.
>
> and do that for?!?
I've had one since I started this buggy lark..... had a Cateye solar on
my mbike until I got curious about how fast we were really going (cos it
feels so fast but I knew the feeling lied)
Turned out what we thought was 'highway speed' was about 25km/h (-:
but at least my curiousity was satisfied, and continues to be....
I found the Cateye ate batterys fast, despite the solar panel (its' prob
broken, I got it 2nd hand), so I carved a piece of wood to fit, glued on
some brass plate, to make a surrogate 'battery', which connectes via
short wires to 2 AAA alkaline cells bluesticked to the outside. spot of
clear varnish from a spray can to keep the terminals dry and it's still
working a year later.....
anyhow, last weekend what felt like 'holyshit' speed turned out to be
exactly that, local speed record of 47km/h (by Steve), personal best of
39.9km/h (and most of that was sideways with the Cquad parked,
wooohoooo, with buddy Dave riding past with his Jojo saying "you could
go faster if you work the kite", and there I was 100 meters from the
'must turn now cos of people on the beach' point thinking "how the heck
do I slow down to turn this thing without blundering off into the dunes
while I'm at it!")
(I figure it out though.....'just do it'....)
I mounted my magnet as close to the center of the wheel as I could,
since I'd noticed before that at high speeds it misses pulses. The
center of the wheel is travelling slowly. My advice is to do this, most
cycloputer sensors are not rated for the sort of speeds we do.....(it's
the angular velocity you see....small wheels turn at higher rpm for the
same mph than a bike wheel)
steam and wind
--
David Forsyth DaForce A-T Iwr.Ru.Ac.Za
Keeper of the listserver for South African Railways fans _|_ His
Part time gricer, kiter, photographer, father etc etc | Way
http://www.ru.ac.za/departments/iwr/staff/daf/welcome.html | Up
DAFkite
> See you all at Ivanpah in 10 days.
ah, shut up already about Ivanpah.....
(-:
yeah, i'm jealous
TEDSFOILS
retail for $39. reg. If anyone wants one let me know I will put your name on
it. Of course I will give you all a discount.
Sylvain Bouju
> The *best* speedo for bikes, as well as buggies is
> the Enduro 2. I have one for my bike and one for
> my buggy.
...and the best dentist is mine;-)
In my opinion, the really best is the Garmin GPS III,
with his compass page and with the big digits option.
Just a little too expensive to have it with me on the
buggy...
--
Sylvain Bouju
sbo...@bigfoot.com
.
DAFkite
>
> AhClem0013 wrote:
> >
> > In article <19990224142832...@ng-fq1.aol.com>, core...@aol.com
> > (Coreykite) writes:
> >
> > >55 my ass.
> >
>
> I mounted my magnet as close to the center of the wheel as I could,
> since I'd noticed before that at high speeds it misses pulses. The
> center of the wheel is travelling slowly. My advice is to do this, most
> cycloputer sensors are not rated for the sort of speeds we do.....(it's
> the angular velocity you see....small wheels turn at higher rpm for the
> same mph than a bike wheel)
just to clarify further, I did some spreadsheeting on this and found
that
at 6 mph, a 16" buggy wheel does about 132 RPM
at 6 mph, a 26" cycle wheel does about 80 RPM
and so on up the scale
a significant difference in angular velocity at the sensor. so mount
them as close to the center of the hub as you can, and you'll have
reliable speed readout right up to the mythical '55 my ass'
Steve Bateman
> a significant difference in angular velocity at the sensor. so mount
> them as close to the center of the hub as you can, and you'll have
> reliable speed readout right up to the mythical '55 my ass'
Please correct me if I'm wrong, but a RPM is a RPM no matter
where on the radius of the wheel you are. So the magnet is
going to move past the sensor the same rate no matter where
you mount it.
right?
Maybe you are talking about something else. If so, ignore
this post!
Cheers
Matt Vaughn
center of the wheel, but the linear velocity changes a WHOLE lot (pi*2*r/t =
linear velocity ??). I think the idea with mounting it closer to the center
was suggested because some of the speedometers can't tell that the magnet
has gone by the sensor when it's turning really really fast and the magnet
is mounted near the outside (can't read the "pass" when the linear velocity
is really high). BUT if you put the sensor and magnet near the middle, the
sensor has more time to pick up the signal as the magnet passes.
Also, it doesn't matter where you mount it (that constant angular velocity
thing) when you're trying to figure out the circumference of the wheel.
Look at it this way, the spoke stays straight, right? So, if you mark the
wheel at one spoke, then turn the wheel one complete revolution, didn't the
spoke also make one complete revolution? So, what you are really worried
about, circumference-wise, is the outer diameter of the wheel. As long as
the speedometer thinks 1 revolution is 60" (or whatever it is), then it will
count every revolution as 60", no matter where the sensor is mounted.
Matt Vaughn
>I saw a TV prog. recently about the Thrust SSC. If I remember correctly,
>the force acting at a tangent on the outer rim of each aluminium wheel was
>somthing like 35,000g.
>
>I guess the speedo would feel more comfortable and have a more relaxed life
>nearer the hub but might be easier to calibrate (chalk line method) further
>out.
Matt Vaughn
clarify in my own little way. . .
James Hodson
wrote:
>Please correct me if I'm wrong, but a RPM is a RPM no matter
>where on the radius of the wheel you are. So the magnet is
>going to move past the sensor the same rate no matter where
>you mount it.
>
>right?
Sounds right to me.
Wouldn't the force on the speedo be greater the further out from the hub
the device is?
I saw a TV prog. recently about the Thrust SSC. If I remember correctly,
the force acting at a tangent on the outer rim of each aluminium wheel was
somthing like 35,000g.
I guess the speedo would feel more comfortable and have a more relaxed life
nearer the hub but might be easier to calibrate (chalk line method) further
out.
Physics... I've forgotten it all!
Regards
James
It's about time I changed this sig.
AhClem0013
<mat...@nospamclemson.edu> writes:
>It is the angular velocity that remains constant any distance from the
>center of the wheel, but the linear velocity changes a WHOLE lot (pi*2*r/t =
>linear velocity ??). I think the idea with mounting it closer to the center
>was suggested because some of the speedometers can't tell that the magnet
>has gone by the sensor when it's turning really really fast and the magnet
>is mounted near the outside (can't read the "pass" when the linear velocity
>is really high). BUT if you put the sensor and magnet near the middle, the
>sensor has more time to pick up the signal as the magnet passes.
What he say. Yes Steve, it goes by at the same time no matter where it is in
relation to the center(unless it was in the center-clue)but, it is moving
slower in relationship to the magnet, closer to the center, than to the
outside. It took me a second to get my head around it too, but i did.
That David guy is bright. duh.
l i n e a r v e l o c i t y cool!
DAFkite
>
> DAFkite wrote:
>
> > a significant difference in angular velocity at the sensor. so mount
> > them as close to the center of the hub as you can, and you'll have
> > reliable speed readout right up to the mythical '55 my ass'
>
> where on the radius of the wheel you are. So the magnet is
> going to move past the sensor the same rate no matter where
> you mount it.
>
> right?
Hi Steve
Wrong....
picture a bike wheel going round. picture which bit of each spoke you
can follow going round with your eyes, and which bits you can't..
correct! you can follow the inside bits near the axle, but the outside
goes too fast (even though the whole wheel is turning at the same speed)
and appears blurred.
As Matt says, it's the velocity at radius x from the hub center that
concerns us here. For a given RPM, the velocity that a magnet at 4
inches out has is much lower than one at 8 inches out. This is the
issue. We want that magnet to go past the sensor as slow as possible
so the sensor (just a magnetic reed switch on most units) has time to
close properly, EVERY time.
The speedo still counts revs and calculates, from the circumference you
entered during setup, how far you went and sets that off against time
elapsed to give you speed in MPH or KMH.
> Maybe you are talking about something else. If so, ignore
> this post!
can't do that, if you don't get it, nor will many others, and they'll
live in ignorance of my fantastic truths.
can't have that!
(-:
they'll be doing 55 in no time if we allow them to.....
DAFkite
>
> In article <7bfkat$osk$1...@hubcap.clemson.edu>, "Matt Vaughn"
> <mat...@nospamclemson.edu> writes:
>
> >It is the angular velocity that remains constant any distance from
yes....
the
> >center of the wheel, but the linear velocity changes a WHOLE lot (pi*2*r/t =
> >linear velocity ??). I think the idea with mounting it closer to the
yes, grind stones are rated so that at their recommend RPM, the grinding
surface has a certain velocity, and certain grits and compositions have
preffered velocities at which they grind better.....
ergo, placing you finger on the edgeof the grinding wheel grinds it off
faster than if you put it near the axle (don't ask me how I know :-)
> >near the middle, the
> >sensor has more time to pick up the signal as the magnet passes.
yes....
> What he say. Yes Steve, it goes by at the same time no matter where
> it is in relation to the center(unless it was in the center-clue)but, it is moving
> slower in relationship to the magnet, closer to the center, than to the
> outside. It took me a second to get my head around it too, but i did.
>
> That David guy is bright. duh.
thanks
> l i n e a r v e l o c i t y cool!
quite so, sorry, 'angular' was the wrong term, right idea
though.....(pats self on back)
David and Patty Town
>Whoooeeee!!! You gonna race Ted?? C'mon, are you???? Beat you to the fence
>and back, give you a half a length! Travo, you in? Invisible Dave wanna go?
>Hey DT, tiger boy, what up? and those boys from Oklahoma. . . shoot, and we
>always get someone there for their first time. Kieth is gotta be there. Dave
>Lord with a mast! Fritz to fast. . . . and you never know, Dodd could
>surprise us all.
You guys are going to have to have fun at SBBB without me this year.
Can't make it. Bummer... but a word of caution for you speedsters that
want a speedo to measure your best runs... A typical bike speedo uses
a 3 digit counter to count revs per minute to calculate and display
your speed. This is no problem for bikes with those big 26 and 27"
wheels. But on buggys, when you are running a 16" wheel, you start
turning 1000 rpm at just about 46 mph. After that, the three digit
counters get "confused" and the displayed speed will fluctuate wildly
and be totally wrong. Don't get me wrong, there are some speedos out
there that are accurate above 1000 rpm. If you're going to go fast, be
sure to verify that the speedo of your dreams will do what you need it
to.
Hey Dean... guess you'll just have to find someone else to serve up an
extra large helping of dust this year. But 'll be back next year...
See ya in Wildwood !
D.T. (Tiger Boy)
AhClem0013
(David and Patty Town) writes:
>You guys are going to have to have fun at SBBB without me this year.
Dang it Tiger Boy, we need you there, it just won't be the same without your
big bad body going by in a whoosh!
Sorry you gonna miss out Dave, we'll miss you!
Patty too.
Dave Franklin
>Please correct me if I'm wrong, but a RPM is a RPM no matter
>where on the radius of the wheel you are. So the magnet is
>going to move past the sensor the same rate no matter where
>you mount it.
>
>right?
SORRY
Not Evan close
the significant thing is the distance covered by the section of wheel under
the magnet to complete the round trip
Assume wheel is doing one rev a second and the distance around the wheel at
the point under the magnet is 12 inches
then you are moving at 12 inches per sec
if the wheel was doing one rev a second and the distance around the wheel at
the point under the magnet is 12 mile
then you are moving at twelve mile per second
sm...@optonline.net
Dave Franklin wrote:
WHAT???
the speed you are going has NOTHING to do with the placement of the magnet on
the wheel!
with your theory you just move the magnet further away from the axle and you go
faster :) cool
the magnet will move faster but not you.
of course if you are on a buggy with 3.8 miles diameter wheels (= 12 miles
circumference) and they turn once per second you are going mighty fast (43200
mph).
bernd
AhClem0013
<dfra...@intertain.com.au> writes:
>>Please correct me if I'm wrong, but a RPM is a RPM no matter
>>where on the radius of the wheel you are. So the magnet is
>>going to move past the sensor the same rate no matter where
>>you mount it.
>>
>>right?
We mounted my magnet on the hub itself, so when i was going 40, it still seemed
to be barely moving. Calibrated it with a GPS spot on, is really nice to know,
because when i felt like i was going the fastest(slightly upwind) i was
actually only going about 27-31mph, and when i was really going the
fastest(slightly downwind)it felt like is was barely moving but i would really
be going 40-44mph! Weird!
Brent Cooper
> because when i felt like i was going the fastest(slightly upwind) i was
> actually only going about 27-31mph, and when i was really going the
> fastest(slightly downwind)it felt like is was barely moving but i would really
> be going 40-44mph! Weird!
>
> total AoxomoxoA brought to you by. . .
> . . . dean jordan
> please buy * jordan air kites * every chance you get!
> 13
Anyone.....
So, if I had a GPS, I could turn it on, stick it in my pocket while buggying,
then take it out and see how fast I went??
Brent Cooper
AhClem0013
<bcf...@ix.netcom.com> writes:
>So, if I had a GPS, I could turn it on, stick it in my pocket while buggying,
>then take it out and see how fast I went??
Most of the people using them, mount them on their down tube so they can look
at it in motion. It would be a real help in the endurance race, believe me!
Collette Lemons
trimmer thing) it has a zipper accross the top perfect for sliding it in and I cut
a hole for the button and one for the face. I sewed reinforsement around it and a
strap accross the areabetween the buttons and the picture face to keep it from
coming out. Then we added a layer of computer packing foam - the dark gray stuff
works great. (the rubbery back clings to the foam and helps hold it steady) Then
we found some really heavy duty velcro and put it on the buggy and the back of the
leather bag. We also wrapped tape around the ends of the velcro on the buggy so
it would not come up with all the pulling and bouncing around. He could play and
glance down at it and it was ok.
A lot of GPS owners simply put velcro on the back of the GPS and on the buggy slap
it on and away they go. We didnt want the sticky glue on our GPs and we wanted to
cut down on the abuse it would be taking. I am not sure if it matters much either
way. It will work putting it in your pocket - but you can't see it as you go. It
will still record your speed and where you have been.
The bag was easy to do - I made it so anyone can. If you are good at sewing - you
could probly make the bag itself too.
Collette
Brent Cooper
I'm going to run out and get a GPS. I'll think about the mounting
of it after I get one.
Brent Cooper
Steve Bateman
>
> In article <ddBI2.145$Q33....@nswpull.telstra.net>, "Dave Franklin"
> <dfra...@intertain.com.au> writes:
>
> >>Please correct me if I'm wrong, but a RPM is a RPM no matter
> >>where on the radius of the wheel you are. So the magnet is
> >>going to move past the sensor the same rate no matter where
> >>you mount it.
Boy, I posted that a looong time ago...
> We mounted my magnet on the hub itself, so when i was going 40, it still seemed
> to be barely moving. Calibrated it with a GPS spot on,
When I was going to try to set an endurace record in the buggy, I
shopped around for a GPS. Most everywhere I shopped told me that
they are not accurate for speeds under 15mph. Don't bitch and rave
at me, that's just what I was told.
As long as your speed is up, I'm sure they work fine. But for a
all around speedo they are a tad expensive, when you can buy a regular
speedo for $20.
Steve Irby
Steve Bateman wrote in message <36F5C4...@sprintmail.com>...
>
>When I was going to try to set an endurace record in the buggy, I
>shopped around for a GPS. Most everywhere I shopped told me that
>they are not accurate for speeds under 15mph. Don't bitch and rave
>at me, that's just what I was told.
>
>As long as your speed is up, I'm sure they work fine. But for a
>all around speedo they are a tad expensive, when you can buy a regular
>speedo for $20.
>
>--
>Steve Bateman geokite at sprintmail dot com
>7.0m 1st gen. Chevron buggy kite, Icarex+spectra, $175+shipping
>The best health info is at http://www.healthcentral.com
>
kind, which was less fuss not having wires to fool with and get snagged
loose in transit etc. It is possible to get one calibrated so that it is
quite accurate. My sending unit was difficult to mount on the fork so that
it was secure enough to keep from moving around. It finally got lost on the
beach somewhere. I still have the display unit part ( receiver?) I'll give
to a good home. The more powerful magnets I found at a hardware store seemed
to help it get a good wave on every rev. I actually bought the GPS for use
on the motorcycle, and found that it made a handy replacement for the bike
speedo. The GPS is very accurate and has some unique functions, like
telling which way is it back to the camp from some lonely part of Alvord dry
lake. If I gave a newcomer the waypoints for "Walts Bay" on ElMirage, he
would have no trouble finding us with his GPS. That would have helped one
buggier that stopped by Elmer when we were there, but didn't know where we
were. Also, using the "Go-TO" feature, it can constantly tell you the
distance from where you are to, say, camp, at a glance, no button pushing.
I always wear heavy gloves, so the hands free display is I guess my favorite
feature.
Another fun feature when using a GPS, is that you can try out another
persons buggy, and take along your "speedo" with little fuss. Mine simply
straps on to any buggy downtube with a velcro belt and a safety strap.
For about $99 you can get a good one , maybe less nowadays. I may upgrade
to a Garmin GPS III, does anyone want to buy my Garmin GPS 12 ?
It's funny, motorcycle speedo's are so inaccurate, reading 5-10% high, that
there is a similar thread on the motohead newsgroup about using bicycle
speedo's on motorcycles. hah!
Whatever works for you is the best, I say.
Steve ( busy working on my Ivanpah web pages..) Irby
I'll let the group know when they are up.
si...@nwlink.com
http://www.nwlink.com/~sirby
daForce
<19990319222224...@ngol04.aol.com>:
>In article <ddBI2.145$Q33....@nswpull.telstra.net>, "Dave Franklin"
><dfra...@intertain.com.au> writes:
>
>>>Please correct me if I'm wrong, but a RPM is a RPM no matter
>>>where on the radius of the wheel you are. So the magnet is
>>>going to move past the sensor the same rate no matter where
>>>you mount it.
>>>
>>>right?
>
>We mounted my magnet on the hub itself, so when i was going 40, it
still seemed
>to be barely moving. Calibrated it with a GPS spot on, is really
nice to know,
>because when i felt like i was going the fastest(slightly upwind) i
was
>actually only going about 27-31mph, and when i was really going the
>fastest(slightly downwind)it felt like is was barely moving but i
would really
>be going 40-44mph! Weird!
it's the 'wind the face' effect
going downwind you have none or low wind-in-the-face, so you don't
feel you're moving
going corss or upwind, you gets lots of face wind, ergo feeling
faster.
this all based on ones normal experience of wind, in that if you
walk, and feel wind, it gives you a sense of your speed, then run,
you get more wind, and you know you're going faster......all undone
by travelling at near windspeed in various directions.
AhClem0013
writes:
>this all based on ones normal experience of wind, in that if you
>walk, and feel wind, it gives you a sense of your speed, then run,
>you get more wind, and you know you're going faster......all undone
>by travelling at near windspeed in various directions.
Plus no doubt the shaking and shuddering you get trying to fight upwind or hold
a line cross wind, and the smoothness you feel when you are slightly off wind
lulls you into thinking , ah it's nothing!