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914World.com _ 914World Garage _ I was thinking it may be fun to build a prop

Posted by: rick 918-S Nov 2 2005, 10:45 PM

I have a couple of good type 4 motors laying around. I was thinking it would be fun to build a prop driven snowmobile like a swamp boat. Anyone know where can get a prop? No I haven't googled the thing.

Posted by: r_towle Nov 2 2005, 10:53 PM

try to google...there is a type 4 airplane company that has been making them for about 20 years...

http://www.ultralightnews.ca/Ivoprop/index.html
http://www.greatplainsas.com/

the prop setup is a bolt on kit from them...

Cool idea...

Rich

Posted by: Dave_Darling Nov 2 2005, 11:16 PM

Aircraft props are optimized for about 2000 RPM operation. Aircraft that use automotive engines usually run gear-reduction boxes to allow the prop's optimal RPM (about 2000-2500, maybe) to occur near the engine's peak power RPM.

You can sometimes find AC props that have "aged out"--they seem structurally good, but have been in use long enough that the FAA won't let them be used any more.

You might have better luck with some sort of ducted fan setup--though I don't know where you'd find that for cheap.

--DD

Posted by: East coaster Nov 3 2005, 07:16 AM

Try a place called "Great Planes". They do type I and type IV conversions and can help you with props, prob hub/flanges, etc..

I'm runnning on of their type I motors on this<<<<<<<<<<<<<<

Here a link: http://www.greatplainsas.com/

Posted by: SGB Nov 3 2005, 09:47 AM

Rick- you be Kraze-zee!

Posted by: bd1308 Nov 3 2005, 10:03 AM

are these actual aircraft that can be registered with the FAA?

b

Posted by: East coaster Nov 3 2005, 10:37 AM

b, yup! real aircraft (experimental) that receive FAA certification

Posted by: JCG Nov 3 2005, 12:26 PM

I had similar thoughts years ago after seeing a picture of a "snowplane" in the back of a woodworking magazine. Apparently they used bent hickory or ash to make the skis. It might be cool to cut up a bug and use as a fuselage. I hope you do it.
http://images.google.com/images?q=snowplane&svnum=10&hl=en&lr=&ie=UTF-8&safe=off&start=0&sa=N

Posted by: airsix Nov 3 2005, 02:19 PM

Speaking as both a pilot and snomobile rider I think you'd have more success building a snow-vehicle that put the power to the ground vs. using a prop (unless it's really flat where you live and the snow is never sticky).
-Ben M.

Posted by: rick 918-S Nov 3 2005, 03:54 PM

Just thinking out loud now. Like I really have time. I haven't been home for a week in the last two months. Maybe I should get a life first.

Posted by: Twystd1 Nov 3 2005, 04:00 PM

QUOTE
Aircraft props are optimized for about 2000 RPM operation. Aircraft that use automotive engines usually run gear-reduction boxes to allow the prop's optimal RPM (about 2000-2500, maybe) to occur near the engine's peak power RPM.

Dave,

You never cease to amaze me.

You know way to much...

Please act dumb for a week so the rest of us can catch up...

Regards..

Twystd1

Posted by: rick 918-S Nov 3 2005, 09:20 PM

The combined brain power here is 100 times the ability of the Cray.. You can ask most anything and get real world experience answers. Way better than google.