Catto props
Hi soarandtow, I've got a 9a with a 0235 C2C (115 max power, plated 108 hp). This a/c weighed 893 lb empty, but in the four years since getting it into the air (with a few minor changes) it has crept up to 905 lb. I mention the weight as part of your consideration for your choice of prop. The engine is another part.
The C2C is a low compression engine 6.7-1. It is fitted with duel P-Mags, Rotec TBI, 1 1/2" Vetterman crossover exhaust and a Catto prop.
I've had two Catto props on this 9a, 60" pitch two blade and a 64" pitch 2 blade. The 60" got off the ground about 40' quicker and climbed about 50' pm better but cruising @ 2400 rpm the 64" sat the IAS on 120 kts where the 60" sat the IAS on 118 kts. At that RPM the 64" sat the fuel flow meter at 20 Lph and the 60" at 22 Lph. At altitude when cruising at this IAS, TAS is usually around 140 kts. There is 100 rpm difference between the two props on t/o and climb out.
I now only use the 64" pitch prop.
This may interest you, I live in QLD Australia and I've just returned from a trip to Victoria (850 nm each way). Because I had a good tail wind on the way back I pulled the throttle back to cruise at 115 kts IAS (137 TAS). this resulted in 6.1 hrs for the trip and averaged 17.9 Lph ROP. I believe the awesome economy comes from the Rotec TBI and the duel P-Mags, the 1 1/2" exhaust would also contribute to that!
Hope that is of some help!
Bob
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