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Jim Allen

Jim Allen

Well-Known Member
Joined
Jun 7, 2005
Messages
1,622
I have been receiving E-mails about a test stand that can be used for nitro & gas engine testing or break in. The posted photos show the test stand which uses various diameter carbon fiber propellers as a loading device. The 30 lb test stand is very rigid & careful propeller balancing gives very smooth operation at high RPM's. Falcon brand carbon fiber propellers used are absolutely rigid & shatter proof.

Jim Allen
 
dave roach said:
Jim

No shield around the propeller.
Click to expand...
Dave,

I haven't considered doing this safety feature for this test stand because it uses cut down carbon fiber props. I'm using 17" to 20" diameter propellers that are approximately .650" thick X 1.500" diameter at the hub. They come with a 5/16" hole which I machine to a very tight fitting .3750" - .0003" for the .3750" prop shaft. They are cut down to size in 1/2" increments before balancing. Notice the hardened steel washers on both sides of the hardened steel prop shaft. On other test stands which used glass filled nylon props, a 3/8" thick aluminum shield was used. Wood propellers would be out of the question & glass filled nylon would be border line for continuous high RPM use!

JA
 
Very Nice!!!! Are those your own billet motors?

Brad

Yes.

JA
 
Last edited by a moderator:
As always Jim, incredible work!

I was thinking about doing something similar to break in nitro motors but was considering a 1/4" flex shaft with a pillow block and bearings on the stub end. Was also thinking about using a pusher prop and small exhaust deflector to minimize the mess. That way the motor could go right from the boat and onto the cradle with minimal "reconfiguring".

Thoughts?
default_rolleyes.gif
 
Last edited by a moderator:
Terry Keeley said:
As always Jim, incredible work!

I was thinking about doing something similar to break in nitro motors but was considering a 1/4" flex shaft with a pillow block and bearings on the stub end. Was also thinking about using a pusher prop and small exhaust deflector to minimize the mess. That way the motor could go right from the boat and onto the cradle with minimal "reconfiguring".

Thoughts?
default_rolleyes.gif
Click to expand...
That is exactly what I do with this thing. Look at the shock mounts used for the gas engine which are used in Andy's gas rigger & the solid mounting used in Andy's .80 size rigger. I have been trying to call you. Give me a time to call & I promise to give you something to laugh at?????

JA
 
Last edited by a moderator:
Terry Keeley said:
As always Jim, incredible work!

I was thinking about doing something similar to break in nitro motors but was considering a 1/4" flex shaft with a pillow block and bearings on the stub end. Was also thinking about using a pusher prop and small exhaust deflector to minimize the mess. That way the motor could go right from the boat and onto the cradle with minimal "reconfiguring".

Thoughts?
default_rolleyes.gif
Click to expand...
Hi Terry,

I think John Ackerman built and used one in Indy many years ago, Marty may be able to add more details but from what I recall he used stainless steel tubing for the flex shaft to run in and it was bent on a 45 or 90 degree angle so as to clear the pipes. It think the props used were a Kavan product.

Thanks, John
 

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