Hatz Biplane Association

.... like my X told me, I think I am at a point where I can't afford you.

They would need to be designed from ground up ( sorry for the pun), without some dimensions and load/stress data its going to take some serious engineering. They will not be cheap, but then what is in the world of airplanes. May take a completely different approach too, looking at it from a point we are just interested in the out side appearance, then how we do the inside is open to many ideas. I like to use off-the-shelf parts and modify if possible.

So the idea is what would carry all the load requirements as a rim to mount the tyre & brake disc on? The outside can then be made of any material for looks.

Ideas?

KAP

P.S. Would be great to have, on loan, a rim assembly to measure.

Coker Tyres: http://store.cokertire.com/

Question: does anyone know what the max side load would be on the rim? .... estimate?

I know there are a lot of variables in involved but maybe we can start somewhere .... (?)

Keri-Ann,

The grove 6 inch wheels are rated to a 1750 lb static load per wheel, not sure what the clevelands are. That might be a starting point but it also may be easier to just use the Classic's gross weight and use the FAA guidance for ground loads for certified aircraft to estabilsh design goals for the larger wheels.

I checked the FARs for design criteria for Part 23 aircraft and pasted the applicable section here but it might be worthwhile to see the whole section

Sec. 23.485 Side load conditions.

(a) For the side load condition, the airplane is assumed to be in a level attitude with only the main wheels contacting the ground and with the shock absorbers and tires in their static positions.

(b) The limit vertical load factor must be 1.33, with the vertical ground reaction divided equally between the main wheels.

(c) The limit side inertia factor must be 0.83, with the side ground reaction divided between the main wheels so that--

(1) 0.5 (W) is acting inboard on one side; and

(2) 0.33 (W) is acting outboard on the other side.

(d) The side loads prescribed in paragraph (c) of this section are assumed to be applied at the ground contact point and the drag loads may be assumed to be zero


v/r,
Jud

Thanks Jud. Good place to start looking at a the numbers and a design.

I like the statement "the airplane is assumed to be in a level attitude with only the main wheels contacting the ground". I do not think I ever put both wheels on the ground at exactly the same time.

Blue skies,
Keri-Ann

well we all know the FAA lives in fantansy land!

If anyone has one of these Bendix cast aluminum hubs, it would be great if you could send me a dimensional drawing so I may build a 3D Model of it and do some load simulation on the hub. Looking to do a detailed set of drawings, so others would have the option to build a pair if so needed. We could make the rim fit off-the-shelf tires.

..... anyone willing to help out with this project?

Blue skies,
Keri-Ann

I would if I had a set...

Its been a while since Dick Fisher said it would be a while before he made wheels again. Has anyone had any contact with him in the last few months or found any options for 16" wheels other than those discussed above??