Hull Modifications
Kent.P...@mailexcite.com
Classic and could use some insight from these experts. I understand this hull
was originally designed for an inboard and was never modified for sterndrives.
The Hull is stock with the exception of having the hook taken out. The
present inside strake (3" wide) stop 24" from the transom. The bottom at the
transom is rounded, not a sharp vee. I want to get the hull higher out of the
water, increase stability at speed without killing me on re-entries when I
launch. I am presently propped to run 60.
I am planning on extenting these and looking at three options.
1) Extending to the transom(full width)
2) Extending partially to the transom (full width)
3) Extending to the transom but at a reduced width.
Any comments?
Kent
-----== Posted via Deja News, The Leader in Internet Discussion ==-----
http://www.dejanews.com/rg_mkgrp.xp Create Your Own Free Member Forum
LAM700x
6" or 8" wide at the transom running forward
about 18" then tapering to the vee ??????????
the pad bottom has been used sucessfully
in several deep vee applications
Bosn-Paul K.
that has a more quiet and smoth running 300 HP Diesel out there.
The newest engine from Yanmar is the 6LY2-STE, it's a 420 HP 6 Cyl.
Diesel that weights only 1100 Lbs. We have the first one's comming with ZF's
new 2 speed elec. shift transmissions. Can't wait to rig the first boat with
it.
Mark Whatman
Unless the lifting strakes and the chines are modified the boat will
lift up on the pad and chine walk like a mother. You could extend the
strakes to provide more lift at a point away from the keel and preserve
your lateral stability. I believe Volvo markets a product developed by
Ocke Mannerfelt called the Speed Rail (
http://www.ocke.se/omd/technology.html ) . They are add-ons for your
inside strakes that create lift. You could also look into an extension
box for your outdrive. Mastry was working an a nifty device that looked
like a jack plate for outdrives. It provided extension and the ability
to move the drive vertically while under power. It looked pretty neat
at the Miami show but I haven't heard much since.
I'd add the speed rails first, a pretty cheap alternative to extending
the transom, then go from there. One word of advice, make one change at
a time and document everything. It takes longer but it's the only way
to really see if the money you're spending is paying off
--
Mark Whatman
mwha...@worldnet.att.net
http://home.att.net/~mwhatman
LAM700x
MAllwe5877
>From: Mark Whatman <mwha...@worldnet.att.net>
>Date: Wed, Aug 5, 1998 20:13 EDT
>Message-id: <35C8F501...@worldnet.att.net>
The Mastry adjustable box, known as the "X" Factor is now undergoing extensive
testing. Interestingly, Mastry has employed the box on a 300hp Yanmar Diesel
powered 22' Donzi Classic with extremely impressive results. With the addition
of the box, the boat has picked up approximately 6-7mph and is now running
close to 80mph. Just another example of Adib's genious.
Mike A.
JBrown5940
strakes install the 380s's on the boat but level across the transom not
parallel to the bottom, this creates transom lift with little drag and great
stability. my offshore raceboats are set up this way.
jeb brown
spoiled banana racing
cool running racing
Kent.P...@mailexcite.com
I've looked at the "speed rails", but I don't need lift at slower speeds. At
60+ I can trim high enough to where I am riding right where the center
strakes end. I've considered "padding" the bottom, but Mark is right, I would
need to add external power assisted steering to "drive" it unless I also
extend the strakes also. If I do both, I will basically have a "Flat Bottom"
that looks like a deep vee. Would get kinda nasty in 3'+ chop.
Andrew?, Mike Jenkins?, Laser? Would love to hear your comments.
Mark Whatman
> I've looked at the "speed rails", but I don't need lift at slower
> speeds. At
> 60+ I can trim high enough to where I am riding right where the center
>
> strakes end. I've considered "padding" the bottom, but Mark is right,
> I would
> need to add external power assisted steering to "drive" it unless I
> also
> extend the strakes also. If I do both, I will basically have a "Flat
> Bottom"
> that looks like a deep vee. Would get kinda nasty in 3'+ chop.
>
> Andrew?, Mike Jenkins?, Laser? Would love to hear your comments.
>
> Kent
>
I didn't realize the strakes ended that far forward. Extending the
strakes would have a similar effect to adding a small pad but the lift
would be farther out.
Another possible idea might be Arneson "rocker" plates (I think that's
what he calls them). They claim to provide both bow and stern lift,
depending on the setting. Arneson's a bit out there but most of his
inventions do what they say. Couple that with the added leverage of an
extension box and you might be on the right track.
If Mastry actually saw 7-8 mph with their "X Factor" box, and I suspect
they did, that might be all you need to satisfy that need for speed!
Ric
out of the water? Ride attitude or level lift?
If you desire a higher riding bow, then extending the strakes rearward will hinder
that instead of enhancing it.. The boat would then raise higher in the rear, thus
pushing the nose farther over... Not a desirable effect if the boat is running
wet...
What is the diameter of the your propeller??? What type of propulsion are you
using, i.e. a bravo or alpha? Or is the boat as you mentioned an inboard? What is
the gear ratio and propeller Pitch? What type of engine? Do you know the boat's
weight?
With a 6' straight edge, (Metal not a piece of wood) is there any hook or rocker
in that last 6' of the hull? You stated that the hook was removed, but a boat that
sits on the trailer allot will tend to form to the shape of the trailer bunks, and
that sagging under the weight of the boat can re-introduce some hook when the boat
is first launched.. (seen this allot on older boats)
Does the boat chine walk? Is 60 as fast as you want to go, or can afford to go? I
know of a 18' Donzi with an Arneson Surface Drive and a 454 that runs in the low
90's.. No it doesn't have allot of power, just a loose nut behind the wheel.. But
it Chine Walks terribly.. Which can be cured though...
Ric
Kent.P...@mailexcite.com wrote:
> I have been looking very seriously about some hull modifications to a Donzi 18
> Classic and could use some insight from these experts. I understand this hull
> was originally designed for an inboard and was never modified for sterndrives.
>
> The Hull is stock with the exception of having the hook taken out. The
> present inside strake (3" wide) stop 24" from the transom. The bottom at the
> transom is rounded, not a sharp vee. I want to get the hull higher out of the
> water, increase stability at speed without killing me on re-entries when I
> launch. I am presently propped to run 60.
>
> I am planning on extenting these and looking at three options.
>
> 1) Extending to the transom(full width)
> 2) Extending partially to the transom (full width)
> 3) Extending to the transom but at a reduced width.
>
> Any comments?
>
Ric
Mark Whatman wrote:
> .
>
> Another possible idea might be Arneson "rocker" plates (I think that's
> what he calls them). They claim to provide both bow and stern lift,
> depending on the setting. Arneson's a bit out there but most of his
> inventions do what they say. Couple that with the added leverage of an
> extension box and you might be on the right track.
>
>
They will make the boat far more stable, and can help if the boat is "Chine
walking". In the ruff they can lower the bow without the sacrificial drag
of a conventional K-Plate or other trim tabs, and in the Smooth, they can
raise the bow of the boat..
Question is, what exactly is Kent looking for? Higher bow attitude, or
merely better boat control in an 18' er....
Ric
User198
!!! Mostly a bunch of bench racers that have more money than brains ( hence the
llama jokes) Consult a proffesional for all your boating related questions
Mike Carter
I have met quite a few and they are great people and now friends and good
aquantinces. I have learned more on this NG than anywhere and some people on
this NG have actually got me involved in boat racing even more. Now I'm not
saying I'm a racer (far from it right now) but I know alot more now than I
did 9 months ago!!! You would be suprised who post's on this NG and who
reads this NG. See ya, Mike Carter
User198 wrote in message
Ric
MAllwe5877
>Date: Fri, Aug 7, 1998 04:40 EDT
>Message-id: <35CABD69...@FO.Com>
Don't forget the "DICK" part. BTW, dickhead (L'USER198), what type of raceboat
are you currently running?
Laser
And does it have a swim deck ??
Llamafeeder
>>>
>>>User198 wrote:
>>>
>>>> Caution !!!! I would not take anyones advice too seriously on this
>>>nesgroup
>>>> !!! Mostly a bunch of bench racers that have more money than brains ( hence
>>>the
>>>> llama jokes) Consult a proffesional for all your boating related questions
>
>And does it have a swim deck ??
Perhaps a LUSER song contest is in order...
LF
Kent.P...@mailexcite.com
> >
>
> I didn't realize the strakes ended that far forward. Extending the
> strakes would have a similar effect to adding a small pad but the lift
> would be farther out.
>
> Another possible idea might be Arneson "rocker" plates (I think that's
> what he calls them). They claim to provide both bow and stern lift,
> depending on the setting. Arneson's a bit out there but most of his
> inventions do what they say. Couple that with the added leverage of an
> extension box and you might be on the right track.
>
> If Mastry actually saw 7-8 mph with their "X Factor" box, and I suspect
> they did, that might be all you need to satisfy that need for speed!
>
> --
> Mark Whatman
> mwha...@worldnet.att.net
> http://home.att.net/~mwhatman
>
I haven't seen the Arneson rocker plates. Would be interested to see how they
work. I have a Volvo 280 outdrive which has one hell of a hole in the transom
for it. If I consider an extension box, I'll probably also change to a bravo
outdrive. I'll get a bigger boat before I go that route. Because I have a
rounded bottom on the hull, if I extend the bottom strakes to the transom, I
will have very close to a pad bottom.
Adib and Mike, you need to bring that 80 mph Diesel Donzi to the next Hot
boat shoot-out! (They thought 65 was fast before.) Since extending the
strakes should be good for about 4mph Mike, Adibs diesel would be up to the
Donzi Blackhawks' top end!
billy badarse
>
> ><HTML><PRE>Subject: Re: Hull Modifications
> >From: Ric <ScrewJun...@FO.Com>
> >Date: Fri, Aug 7, 1998 04:40 EDT
> >Message-id: <35CABD69...@FO.Com>
> >
> >Could this be comming from someone then that is both short on $$ and brains??
> >
> >
> >> Caution !!!! I would not take anyones advice too seriously on this
> >nesgroup
> >> !!! Mostly a bunch of bench racers that have more money than brains ( hence
> >the
> >> llama jokes) Consult a proffesional for all your boating related questions
> >
> >
> >
>
> Don't forget the "DICK" part. BTW, dickhead (L'USER198), what type of raceboat
> are you currently running?
You called him a "dick",
User198.
But you just didn't realize,
It was just something he ate.
He posted his cheep shots,
He did have his fun.
But whem llamafeeder issued a song contest,
His friends say, "Just run!"
Mike Jenkins
Mike A is right in his T shirt post , " A dick"
You and some like you are why I try to keep
my comments off this NG.
Ric,Mark and others are asking the right Questions and im sure there are
number of
very experienced people following this thread
who may offer advice off the NG. Mike J.
blake
---snip---
> >
> > If Mastry actually saw 7-8 mph with their "X Factor" box, and I suspect
> > they did, that might be all you need to satisfy that need for speed!
> >
> > --
> > Mark Whatman
> > mwha...@worldnet.att.net
> > http://home.att.net/~mwhatman
> >
> boat shoot-out! (They thought 65 was fast before.) Since extending the
> strakes should be good for about 4mph Mike, Adibs diesel would be up to the
> Donzi Blackhawks' top end!
>
> Kent
Hot Boat seems to be pretty good at getting spec's and pictures confused
on a regular basis, but the issue I have with the Donzi and Diesel
reported a 60.1 mph for a top speed. So if Mike A. says they picked up
7-8mph with the X-factor box and the boat is now running close to 80,
something else must have changed too, right ? Anybody know what it was ?
The engine package sure sounds good (from a weight and not having to
rebuild as often perspective), anybody putting them in their boats ? How
many has Mastry installed (if it's something that can be revealed)
--
Reply if needed
Blake.Marriner at worldnet.att.net
GOBB24
gonna do that again...time to bust out the kazoo again...
BB
MAllwe5877
>From: blake <bl...@nospam.com>
>Date: Fri, Aug 7, 1998 11:39 EDT
>Message-id: <35CB21...@nospam.com>
Hey Blake,
The Donzi you read about is the same one I was referring to. The test was
literally the first time the boat had been in the water. Since then there was a
change in drive ratio and more particularly propeller. Plus, at the time of the
test Adib had the boat running consistently 2-3 mph faster than the HotBoat
test driver so the published speed was light to begin with.
Believe it or not, the "X" Factor was originally tested on a turbine
powered 21' Talon. Cannot reveal much else about it except that there is a ton
of interest.
The 300hp Yanmar with the Masforce Bravo One Drive package has been
installed in a great many boats and is dynamite.
In fact, one weekend, before the installation of the box, Adib and I took
the boat up to Miklos' (St. Pete to New Port Richey) and back and cruised the
whole way at over 60mph, running at WOT alot of the time. By the time we got
back the fuel gauge had not moved at all. Remarkable.
Laser
>Kent.P...@mailexcite.com wrote:
>---snip---
>> >
>> > If Mastry actually saw 7-8 mph with their "X Factor" box, and I suspect
>> > they did, that might be all you need to satisfy that need for speed!
>> >
>> > --
>> > Mark Whatman
>> > mwha...@worldnet.att.net
>> > http://home.att.net/~mwhatman
>> >
>---snip---
>> Adib and Mike, you need to bring that 80 mph Diesel Donzi to the next Hot
>> boat shoot-out! (They thought 65 was fast before.) Since extending the
>> strakes should be good for about 4mph Mike, Adibs diesel would be up to the
>> Donzi Blackhawks' top end!
>>
>> Kent
>
>
>Hot Boat seems to be pretty good at getting spec's and pictures confused
>on a regular basis, but the issue I have with the Donzi and Diesel
>reported a 60.1 mph for a top speed. So if Mike A. says they picked up
>7-8mph with the X-factor box and the boat is now running close to 80,
>something else must have changed too, right ? Anybody know what it was ?
>The engine package sure sounds good (from a weight and not having to
>rebuild as often perspective), anybody putting them in their boats ? How
>many has Mastry installed (if it's something that can be revealed)
The boat also had a gear change from 1.5:1 to 1.36:1 . It is running
very fast right now.
blake
Thanks for the update. No kidding, almost 80 from 300hp is impressive.
blake
>
> ><HTML><PRE>Subject: Diesel Donzi/X factor Box was Re: Hull Modifications
> >From: blake <bl...@nospam.com>
> >Date: Fri, Aug 7, 1998 11:39 EDT
> >Message-id: <35CB21...@nospam.com>
> >
> >---snip---
> >> >
> >> > If Mastry actually saw 7-8 mph with their "X Factor" box, and I suspect
> >> > they did, that might be all you need to satisfy that need for speed!
> >> >
> >> > --
> >> > Mark Whatman
> >> > mwha...@worldnet.att.net
> >> > http://home.att.net/~mwhatman
> >> >
> >---snip---
> >> Adib and Mike, you need to bring that 80 mph Diesel Donzi to the next Hot
> >> boat shoot-out! (They thought 65 was fast before.) Since extending the
> >> strakes should be good for about 4mph Mike, Adibs diesel would be up to the
> >> Donzi Blackhawks' top end!
> >>
> >> Kent
> >
> >
> >Hot Boat seems to be pretty good at getting spec's and pictures confused
> >on a regular basis, but the issue I have with the Donzi and Diesel
> >reported a 60.1 mph for a top speed. So if Mike A. says they picked up
> >7-8mph with the X-factor box and the boat is now running close to 80,
> >something else must have changed too, right ? Anybody know what it was ?
> >The engine package sure sounds good (from a weight and not having to
> >rebuild as often perspective), anybody putting them in their boats ? How
> >many has Mastry installed (if it's something that can be revealed)
> >
>
> Hey Blake,
> The Donzi you read about is the same one I was referring to. The test was
> literally the first time the boat had been in the water. Since then there was a
> change in drive ratio and more particularly propeller. Plus, at the time of the
> test Adib had the boat running consistently 2-3 mph faster than the HotBoat
> test driver so the published speed was light to begin with.
> Believe it or not, the "X" Factor was originally tested on a turbine
> powered 21' Talon. Cannot reveal much else about it except that there is a ton
> of interest.
> The 300hp Yanmar with the Masforce Bravo One Drive package has been
> installed in a great many boats and is dynamite.
> In fact, one weekend, before the installation of the box, Adib and I took
> the boat up to Miklos' (St. Pete to New Port Richey) and back and cruised the
> whole way at over 60mph, running at WOT alot of the time. By the time we got
> back the fuel gauge had not moved at all. Remarkable.
>
Mike, thanks for filling in the details. Sounds like a package to
consider for repowering my 24' Superboat. Must be a gas (bad pun
intended) to pass some unsuspecting type in his big block powered boat
and watch his nose and face change when he gets a whiff of the diesel
fumes.......
MAllwe5877
>From: blake <bl...@nospam.com>
>Date: Sat, Aug 8, 1998 07:28 EDT
>Message-id: <35CC38...@nospam.com>
It is even more fun to go on long runs cruising at 90+% of WOT and watch
the gas guys throw their arms up in disgust because they know they will break
if they keep going at those speeds. I'd rather have a pleasure boat that goes
70 but cruises all day at 60+ then an 80mph boat which stresses to cruise at
50+, guzzling gas etc.
Baja, with assistance from Mastry actually just put a pair of Yanmar Diesel
350's in a 38' and the boat reportedly ran 64mph. I think you will see more of
these packages in the future.
Kent.P...@mailexcite.com
use...@aol.com (User198) wrote:
> Caution !!!! I would not take anyones advice too seriously on this nesgroup
> !!! Mostly a bunch of bench racers that have more money than brains ( hence
the
> llama jokes) Consult a proffesional for all your boating related questions
>
Hate to burst your bubble User, but most of these "Llama Racers" have more
racing and boat design experience in their little toe than some of us will
gain in a lifetime.
Kent.P...@mailexcite.com
Ric <ScrewJun...@FO.Com> wrote:
> Is the boat running wet? What exactly are you defining as getting the hull
more
> out of the water? Ride attitude or level lift?
Look in the classified of http://www.listco.com. The picture shows the boat
trimmed out at 60mph @4200rpm.
>
> If you desire a higher riding bow, then extending the strakes rearward will
hinder
> that instead of enhancing it.. The boat would then raise higher in the rear,
thus
> pushing the nose farther over... Not a desirable effect if the boat is running
> wet...
>
I desire to reduce the wetted surface of the hull. (I.E. maximum speed with
available power and minimal $.
> What is the diameter of the your propeller??? What type of propulsion are you
> using, i.e. a bravo or alpha? Or is the boat as you mentioned an inboard? What
is
> the gear ratio and propeller Pitch? What type of engine? Do you know the
boat's
> weight?
>
Prop: 14.5 x 26 Mercury outboard lab finished chopper (OverHubExh)
Outdrive: Volvo 280 with hydromotive nosecone, 1.61:1 ratio
350 ci Bal. with Dart II heads, 302 adv/dur cam. Stainless Mar. 4" thru-hull
Has not been weighed, but est. 2600lbs.
> With a 6' straight edge, (Metal not a piece of wood) is there any hook or
rocker
> in that last 6' of the hull? You stated that the hook was removed, but a boat
that
> sits on the trailer allot will tend to form to the shape of the trailer bunks,
and
> that sagging under the weight of the boat can re-introduce some hook when the
boat
> is first launched.. (seen this allot on older boats)
Only worked on the last 2' of the hull (where it runs at top speed)
>
> Does the boat chine walk? Is 60 as fast as you want to go, or can afford to
go? I
> know of a 18' Donzi with an Arneson Surface Drive and a 454 that runs in the
low
> 90's.. No it doesn't have allot of power, just a loose nut behind the wheel..
But
> it Chine Walks terribly.. Which can be cured though...
>
> Ric
>
Does not chine walk yet. I have a smaller "volvo" prop which the boat will run
63-64 @ 5500 and it did not chine-walk there either.
My intention of legthening the strakes are to give the hull some "flat"
surface to plane on. At 60+ trimmed out, the 18 Donzi is riding on a round
surface deep in the water. I learned from water skiing, you need a flat
surface to plane on, rounded surfaces ride deep.
I am wanting to increase hull efficiency (less wetted surface at speed) with
available power/drive. I'd raise the X-dimension, but I ski behind it, so I
don't want to get it too high. I'll also send my prop back in and have it
adjusted to my peak torque (about 5,000rpm-5500) but need to do other mods
before I cut my $1000 prop up.
MAllwe5877
>Date: Sat, Aug 8, 1998 09:11 EDT
>Message-id: <6qhiqk$dul$1...@nnrp1.dejanews.com>
>
>In article <199808070313...@ladder03.news.aol.com>,
> use...@aol.com (User198) wrote:
>> Caution !!!! I would not take anyones advice too seriously on this
>nesgroup
>> !!! Mostly a bunch of bench racers that have more money than brains ( hence
>the
>> llama jokes) Consult a proffesional for all your boating related questions
>>
>
>Hate to burst your bubble User, but most of these "Llama Racers" have more
>racing and boat design experience in their little toe than some of us will
>gain in a lifetime.
>
>
>
>-----== Posted via Deja News, The Leader in Internet Discussion ==-----
>http://www.dejanews.com/rg_mkgrp.xp Create Your Own Free Member Forum
That's L'uuuuuuuuuuuuuzzzzzzzzzzheeerrrrrrrrrrrrrrrrrrr.
Russ...@my-dejanews.com
> In fact, one weekend, before the installation of the box, Adib and I took
> the boat up to Miklos' (St. Pete to New Port Richey) and back and cruised the
> whole way at over 60mph, running at WOT alot of the time. By the time we got
> back the fuel gauge had not moved at all. Remarkable.
Was that a Hooters trip? I was out that day and Steve waived me over and I
saw that Donzi at Hooters. That is a sweet ride. I was in the red Donzi
Hornet III.
Mike Carter
mad, I'm smiling! See ya, Mike Carter
Mike Jenkins wrote in message
You and some like you are why I try to keep
my comments off this NG....
MAllwe5877
>Date: Sat, Aug 8, 1998 10:26 EDT
>Message-id: <6qhn5t$hul$1...@nnrp1.dejanews.com>
That was us. The best part was that we had 4 kids in the boat too and they
loved it. Gotta get 'em going early.
Kent.P...@mailexcite.com
> Must be a gas (bad pun
> intended) to pass some unsuspecting type in his big block powered boat
> and watch his nose and face change when he gets a whiff of the diesel
> fumes.......
>
> --
>
> Reply if needed
> Blake.Marriner at worldnet.att.net
>
Not to mention the thing has one (1) exhaust port in the center of the
transom...LOL
Mike Jenkins
use numbers or names to hid behind and then
take cheap shots, some really get crazy with
there Emails, Your not one of them.......Mike J.
H82LUZ1
H82LUZ1
>racing and boat design experience in their little toe than some of us will
>gain in a lifetime.
>
>
Kent is right. I have met some of these people personally, and have the
utmost respect for all of them. I have learned more from the knowledge and
advice of Adib, Mike A., Steve M.,(Laser), and others, than I may have ever
learned on my own. They, and others on this N.G. (such as Drew Corn), have
taught me to be faster, safer, more consistant and how to be a better racer and
competitor. This News Group has the "Best of the Best" (Top Guns, if you
will), of the offshore racing world. To ignore the experience of the old, and
the technology of the new, that is offered to all of us here would be foolish.
Although we all may "bag" on each other at times, we know we have some of
the top racers in just about every division of powerboat racing. Whether it
be Unlimiteds, hydros, tunnels, drags, etc., EVERYONE shares the love of the
sport and the thrill of true competition. And though we may brag on which type
of racing is bigger, badder, or faster, we ALL have a deep respect for the
danger involved.
SO, in short...
>Consult a proffesional for all your boating >related questions
Dude, These ARE the professionals !!!
Respectfully submitted to you on this date, August eight, 1998. Michael S.
Gordon, seargent at arms.
(Rush chairman, Damn glad to meet ya)
MAllwe5877
>Date: Sat, Aug 8, 1998 17:11 EDT
>Message-id: <199808082111...@ladder03.news.aol.com>
You are gross.
Mike Carter
ya, Mike Carter
Mike Jenkins wrote in message
H82LUZ1
Been called Kinky, Perverted, Twisted, and sick. But gross is a new one to add
to the list.
Mike G.
Mike Carter
and have learn alot from them and made so friends and great acquaintances.
This NG has got me more involved in boating (racing & pleasure) than I ever
thought. See ya, Mike Carter
H82LUZ1 wrote in message
MAllwe5877
>Date: Sat, Aug 8, 1998 18:09 EDT
>Message-id: <6qii9p$4mc0$1...@newssvr04-int.news.prodigy.com>
And so ends one of the great rivalries in all of motorsports. Assholes. Now I
gotta go back to slamming Boob just to get the NG going again.
Ric
Kent.P...@mailexcite.com wrote:
> Look in the classified of http://www.listco.com. The picture shows the boat
> trimmed out at 60mph @4200rpm.
The boat is pretty much out of the water at 60!
> I desire to reduce the wetted surface of the hull. (I.E. maximum speed with
> available power and minimal $.
>
That's a saying I've heard before...But running the number and guessing that you
were using the 26" prop, you only have 6.5% slippage which is excellent. If you can
pull more RPM's then the boat will speed up and get more and more free'er.. If
that's even possible.. (guessing that the pic was taken with the boat running, not
just launching off a wave, water is to flat for that)
>
>
>
> Only worked on the last 2' of the hull (where it runs at top speed)
>
I'd still look at the entire 6' area.. You have to overcome the shape of those first
6' to be able to run on the last 2', and that can help or hinder getting the boat to
run free, if every time you bump a wave the 6' area affects the ride of the boat.
> My intention of legthening the strakes are to give the hull some "flat"
> surface to plane on. At 60+ trimmed out, the 18 Donzi is riding on a round
> surface deep in the water. I learned from water skiing, you need a flat
> surface to plane on, rounded surfaces ride deep.
>
Give it a try is all I can say. I've added strakes and they will lift the rear of
the boat, but at the same time, that will lower the front..
> I am wanting to increase hull efficiency (less wetted surface at speed) with
> available power/drive. I'd raise the X-dimension, but I ski behind it, so I
> don't want to get it too high. I'll also send my prop back in and have it
> adjusted to my peak torque (about 5,000rpm-5500) but need to do other mods
> before I cut my $1000 prop up.
>
From the pic, I'd say its hard to get it much cleaner running..
>
Mike Carter
post's about Velocity were a lot of Fun!!!! Hummm, I really don't have
anything to argue about and this NG has really been DEAD lately. See ya,
Mike Carter
MAllwe5877 wrote in message
<199808082217...@ladder01.news.aol.com>...
Eric C. DeWitt
>And so ends one of the great rivalries in all of motorsports. Assholes. Now I
>gotta go back to slamming Boob just to get the NG going again.
I don't know..LUSER198 is lurking out there somewhere...
it'll be ok, trust me.
LF
Mike Jenkins
Mike Carter
boat racing t-shirt last week in the mail. See ya, Mike Carter
Mike Jenkins wrote in message
<27486-35C...@newsd-144.iap.bryant.webtv.net>...
blake
Yeah, noticed that in the magazine. Judging by the amount of cooling
water spitting out, looks like you could hook a flexible reducing nozzle
on it, aim it up a little and hose down those gas guzzlers as you pass
them <g>
Laser
I have writers block ! I cannot get anything PG13 to rhyme with
USER198 !! Be a sport change your name. Some consider it a honor to be
in a song contest !
Llamafeeder
>
>I have writers block ! I cannot get anything PG13 to rhyme with
>USER198 !! Be a sport change your name. Some consider it a honor to be
>in a song contest !
just shorten it to USER, we'll know of whom you speak.
LF
Kent.P...@mailexcite.com
>
> From the pic, I'd say its hard to get it much cleaner running..
>
Well, I'm making the strakes this week. (Now I remember why fiberglass workers
charge so much )
I'll let you know what, if, I gain anything. I can always grind them off if I
don't like them.
Kent
Ric
Kent.P...@mailexcite.com wrote:
>
>
> Well, I'm making the strakes this week. (Now I remember why fiberglass workers
> charge so much )
>
>
>
Can you pull more than 4200 RPM's with that 26" Prop? Maybe the diameter should
be reduced a bit..
Kent.P...@mailexcite.com
>
> Can you pull more than 4200 RPM's with that 26" Prop? Maybe the diameter
should
> be reduced a bit..
>
>
I had a 14.5 x 24 Merc Chopper(wrong rotation; ran hard on the chine and could
not trim). Ran 63 @ 5300 rpm.
I also still have a Volvo 14 x 26 that runs 60 @ 5000, and 63 @ 5500 (trimmed
very high) This prop slips way too much. Might see about having this one
re-worked.
I will see about having the prop worked a bit when I get though with the
strakes. The Merc Chopper holds very good and cutting it down a little should
not hurt.
ShaneNLa
if you honestly think you can improve on a design by Don Aronow and Jim Wynne,
that has been in production for over 30 years, you should have your head
examined. Leave the boat alone, save your money. I have been there, you will
thank me.
Shane
Kent.P...@mailexcite.com
Improve on a design 30 years old? 1) Don Aronow did that himself several
times in short order. If memory serves me correctly, the 16 Doonzi was from a
17' Formula mold, then the 18 was a stretched 16. The Magnum was Aronows'
next design after the Donzi, then Cigarette, then Aronow/USA Racing. 2) I
guess Formulas, Donzis and Magnums (even Cigarettes) are still winning
Offshore races? 3) Correct me also if I am wrong, but Nortech that has been
DEMOLISHING Factory II looks like an old Cigarette hull with "Hull
Improvements".
Donzi's (and Magnums) are gorgeous boats with a timeless classic style, but
the efficiencies of the hulls are ancient. I know several people that have
extended the inside strakes on both the 16 and the 18, both partially and all
the way, with excellent results; in both speed and stability with a small
loss in ride comfort. The rounded hull with the strakes ending 24" forward of
the transom give a very good ride in rough water, but has a tendancy to start
chine walking over 65mph. The questions posted here was to get feedback from
some of the racers and some of the people here that were involved with Aronow
during his reign.
Thanks for the input though. I hope you enjoy your Magnum as much as I enjoy
my Donzi.
Kent
ShaneNLa
However, my point is this; instead of re-hashing a classic design and spending
lots of time and $$$, for what will still be 1960's/70's technology, my advice
would be to get into a later model boat , where you will benefit from the
modern design and manufacture techniques ( modern materials, lighter weight
layups, high performance rigging, etc.)
I am guilty of " do as I say, not as I do", if it floats, has an engine and
goes like hell, I have probably thrown lots of money at it. Remember this when
you are in the shop working on your boats, and your friends are out on the
water. Good luck with your project.
Shane
Mike
NG!!! I totally agree with your come back though. See you in St. Pete , Mike
C.
Kent.P...@mailexcite.com
> you are in the shop working on your boats, and your friends are out on the
> water. Good luck with your project.
>
> Shane
>
Unfortunately, I enjoy fiddling with boats just as much, if not more than
driving them. If I don't have anyhing to try new, I get bored.
ShaneNLa
Shane