On 06/30/2011 12:06 AM,
bktrub@aol.com wrote:
I'm in need of a test prop so that I can achieve cruise RPM on
the ground for engine tuning/test purposes. I am having problems
in the rpm range that I am only able to achive in flight with my
current prop. I need a prop that is suitable for equal to or
less than 160 hp, and turns in the clockwise direction on a
tractor airplane as seen from the cockpit. I only need this for
ground running with the tail tied down and at speeds not to
exceed 2500 RPM. If anyone knows of such a prop being available
for my purposes, I'd appreciate hearing from them.
Brian Trubee
I finished this prop today, Brian. Nothing left to do but put some
paint on it. It is 90mm square and 70" long. The theory is that I
will be able to enter the RPM my engine drives this at into an
equation, and it will tell me the HP I'm producing.
If you've got a few days for me to finish some test runs, I could
certainly share.
On a related note: I modified the previous prop I had carved to give
it more pitch. My airplane moved under its own power today. Not
fast, or far, but I did get a chance to use the brake 8*)
I also got a smooth idle between 850 and 900 RPM.
I've got to get my generator sorted out, and then I'll be ready to
put the cowl on with its radiator so that I can have some extended
tuning runs.