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Fixed Prop Search
My Velocity fixed gear Elite still needs tail feathers. I've decided to go
fixed pitch for a first prop - that's pretty firm. I'm looking for any
suggestions or advice fellow builders/flyers can offer.
Following Fred Carter's dyno proven Vortec V-6 specs, my all alum. Chevy
racing engine should easily deliver 2,800 to 3000 RPMs static to the prop
with 300 Ft. Lbs. of torque. (Dave Crower - my crank and cam maker - says
his computer dyno shows my engine will deliver even more than Carter's
older design heads and block). The PSRU has a 2 to 1 ratio. I've narrowed
my search to three prop makers: Prince, Felix and Performance.
Both Prince and Felix want me to go with a two blade, although they will
make the three. (They assure me the two blade will do just fine). Given
my 300+ HP, I think three blades will help absorb HP and make for a shorter
prop. Also, it should be smoother and quieter by avoiding parallel wake
My decision right now: A wood prop from Performance. Clark Lydick at
Performance said he won't sell me a two blade because I would not be happy
with it given my HP/torque curves. And, he suggests the other prop makers
prefer the two blade because it's a lot easier to make. Clark's price:
Just guessing, he thinks I should start out with a 68" diameter with 74
degrees of pitch. The widest part of the prop would be approx. 5 to 5.5
I told Clark my #1 priority is a strong take-off prop, and that I would
accept whatever top end speed it delivers.
I know very little about this subject. I'm open to any suggestions,
critiques, other prop makers, etc.
Thanks in advance.
Velocity 173 FGE