Smallest Wheel Around 7.5" Hub ?

[(PeteCresswell)]

Got a no-longer-used ebike motor that I would like to re-purpose into a
powered trailer dolly in the spirit of
http://www.proud-canadian.com/diy-power-trailer-dolly/

The diff being that my boat weighs a couple hundred pounds with about
25-30 pounds "Hitch Weight" when it's on it's beach wheels.

Consequently I am thinking something more like a powered pack wheel like
this guy made from a muy-expensivo pack wheel:
http://tinyurl.com/jlmbxmu or
http://www.thediyhunter.com/images/journal/2015/packwheel-motor-smallwheel/motorized-packwheel-small-20in-wheel-l.jpg

Cut the seat tube/rear triangle off of a junk bike and go from
there.....

Actually it might work with the existing 26" rim, but smaller would be
better - right down to some scheme that attached some sort of wheel/tire
directly to the hub.

So, The Question: What is the smallest rim I could spoke on to the 7.5"
hub in question?...... I've got couple of Rohloff-based bike wheels and
the spokes are *really* short.... and the Rohloff hub is nowhere near
7.5"....
--
Pete Cresswell

[James]

I don't know off hand, but a suggestion is you could work it out by
drawing a wheel using a CAD package that allows you to resize the rim
dynamically and visualise the result. Obviously you will need some
spokes to cross to transmit torque from the hub to the rim.

LibreCAD is free.

I used it to plan my 24 spoke/rim on 32 hole hub rear wheel.

--
JS

[(PeteCresswell)]

Per James:

> Obviously you will need some
>spokes to cross to transmit torque from the hub to the rim.

OK... that answers one question: spokes need to be crossed to transmit
torque.

Thanks.

I am starting to think in terms of something attached directly to the
hub - like a garden cart tire sewn into the spoke holes, maybe with some
foam stuffed inside. .... I've got some Spectra kite line...tough
stuff....

Or maybe just wrap it with a strip of something....

This thing doesn't have to move faster than a slow walk and the weight
on it will not exceed 50# (more like 25....).
--
Pete Cresswell

[sms]

12.5". Custom spokes of course. Do you a spoke cutting and threading
machine? I see offers on eBay for custom cut spokes and they are not too
bad, about $22 for 40 spokes.

Trying to find something to build with the parts you happen to have is
usually a disaster that ends up costing a lot more than buying the
proper parts to begin with.

A motorized wheel for a scooter is what you really need. No spokes, just
mount the tire directly onto the wheel
<http://www.leafbike.com/products/e-scooter-hub-motor/12-inch-electric-motor/updated-version-12-inch-36v-250w-bldc-motor-front-wheel-1052.html>.

The idea of attaching a wheel/tire directly to the hub would probably be
more practical. Harbor freight sells 8", 10" and 13" pneumatic wheels/tires.
<http://www.harborfreight.com/catalogsearch/result/index/?AttribSel=Wheel+Type%3D%27Pneumatic+Tires%27&CatPath=All%2BProducts%252F%252F%252F%252FUserSearch1%253Dwheels&RequestData=CA_AttributeSelected&q=wheels>

[AMuzi]

That's an interesting approach. Maybe some smallish rim
mounted between the flanges with epoxy and a few locating
pins through the hub's spoke holes? If a suitably sized rim
can be found with hollow section, locating pins would be
simple. With enough surface contact between hub and rim
epoxy may be enough and a mechanical stop with pins may not
be necessary.

Not ridiculous and perhaps better than extremely short
spokes which would likely be difficult especially as regards
spoke angle at the rim side.

--
Andrew Muzi
<www.yellowjersey.org/>
Open every day since 1 April, 1971

[avag...@gmail.com]

GNAW BUY A SOLID RIM SOLID TIRE FROM SAY Home Depot for $15/each

https://goo.gl/xzhtV1

[John B.]

On Tue, 26 Apr 2016 09:47:47 -0400, "(PeteCresswell)" <x...@y.Invalid>
wrote:

"25 pounds at a slow walk"? "Hands"?
--

Cheers,

John B.

[(PeteCresswell)]

ePer John B.:

>
>"25 pounds at a slow walk"? "Hands"?

Hills.
--
Pete Cresswell

[(PeteCresswell)]

Per (PeteCresswell):
>Hills.

Plus moving 220# up same...... 25 is the tongue weight.
--
Pete Cresswell

[John B.]

On Wed, 27 Apr 2016 09:11:57 -0400, "(PeteCresswell)" <x...@y.Invalid>
wrote:

>ePer John B.:
>>
>>"25 pounds at a slow walk"? "Hands"?
>
>Hills.

Join the army. They'll show you how to carry 40 - 50 lbs. at a brisk
walk. Up hill and down dale :-)

But more seriously, you must have been raised in town as a "bucket" or
"Pail" usually held in the region of 4 gallons and most farm kids
could carry two of them to water the animals. 4 gallons is ~15 Litres,
is 15 Kg., is ~33 lbs, times, two is 66 pounds :-)

HANDS!
--

Cheers,

John B.

[James]

IIRC, most buckets I've come across hold approximately 10 litres when
brim full.

--
JS

[John B.]

On Thu, 28 Apr 2016 12:53:10 +1000, James <james.e...@gmail.com>
wrote:

Well, O.K. then. 10 x 2 = 20 ltrs = 44 lbs.

But I think yo had small pails as 10 litres is only about 2-1/2
gallons which is a pretty small bucket. At least back on the farm :-)

By the way, didn't you recently mention a wheel or set of wheels that
you had just built that had mismatched holes in the hub and rim?

If so could you elaborate.
--

Cheers,

John B.

[(PeteCresswell)]

Per John B.:

>But more seriously, you must have been raised in town as a "bucket" or
>"Pail" usually held in the region of 4 gallons and most farm kids
>could carry two of them to water the animals. 4 gallons is ~15 Litres,
>is 15 Kg., is ~33 lbs, times, two is 66 pounds :-)

This is all going over my head.

The total load is about 220#.

I can carry one Honda EU2000 generator in each hand (about 50# per
generator) - although I don't feel real good about the possibilities of
collapsing a vertebra or something, so I don't make a habit of it.

Aside from the ability to "Carry" (actually wheel) a 220# load, there
are also traction considerations: loose gravel and such wherein a fall
while trying to manage the load becomes likely and a runaway 220# on a
hill can't be a good thing....

But the *real* driver is that people keep on offering to help me - and
it doesn't feel right putting myself into a situation where it is
obvious that I need help.
--
Pete Cresswell

[Radey Shouman]

Quite a few materials are sold in the US in 5 gallon (~19 l) plastic
buckets, for example drywall mud and doughnut filling. Those buckets
are not easy to carry long distance when filled with water, especially
since the handles aren't very good.

I suppose a real old school farm boy might carry two with a yoke.

Buckets sold qua buckets tend to be smaller, as you say.

--

[avag...@gmail.com]

no 5/10 10L is very weenie....


we have entire university systems founded on the 10G milk can....

[avag...@gmail.com]

https://www.google.com/search?site=imghp&tbm=isch&source=hp&biw=1522&bih=765&q=old+dairy+milk+cans&oq=dairy+milk+cans&gs_l=img.1.1.0j0i5i30j0i24.1715.13140.0.15644.24.16.4.4.4.0.379.2486.0j12j2j1.15.0....0...1ac.1.64.img..1.23.2578...0i8i30.RIXb4YmvG60#imgrc=w7u2ldMFcMzX5M%3A

https://www.google.com/search?site=imghp&tbm=isch&source=hp&biw=1522&bih=765&q=old+dairy+milk+cans&oq=dairy+milk+cans&gs_l=img.1.1.0j0i5i30j0i24.1715.13140.0.15644.24.16.4.4.4.0.379.2486.0j12j2j1.15.0....0...1ac.1.64.img..1.23.2578...0i8i30.RIXb4YmvG60#imgrc=Dqvp7d82E9wqrM%3A

[James]

On 28/04/16 21:25, John B. wrote:

>
> By the way, didn't you recently mention a wheel or set of wheels that
> you had just built that had mismatched holes in the hub and rim?
>
> If so could you elaborate.
>

Sure.

This is on a road bike with 700C wheels.

The back wheel has 16 spokes with 3 cross on the right hand side, and 8
spokes with 1 cross on the left. The rim has 24 holes while the hub has
32 holes - but only every second hole is used on the left flange.

The result is that the left side spokes have about the same tension as
the right side spokes. In a "normal" wheel, the left side spokes have
so little tension that the builder must use some "goop" on the spoke
threads to prevent the nipples from becoming loose.

The rim is a 30mm aero profile, so a fairly robust aluminium rim.

<https://www.flickr.com/photos/55102679@N05/6797865179/>

--
JS

[John B.]

On Fri, 29 Apr 2016 08:00:52 +1000, James <james.e...@gmail.com>
wrote:

"Thinking outside the box" :-)

I usually use different diameter spokes and sometimes a different
"cross pattern" on the rear wheel but I had never thought of skipping
holes.
--

Cheers,

John B.

[John B.]

The thing is, that buckets (or pails) sold to contain something are
just that. A container for something. Buckets sold to haul something
are a totally different device. You didn't carry an old paint bucket
out to the barn to milk a cow into :-)

This discussion started with the statement " "25 pounds at a slow
walk" :-)

--

Cheers,

John B.