kookaburra
Member
I have an aero sport power engine (o-375 205hp 9.6:1 compression) from 2010 and it looks like back then they only install non-counter weighted crankshafts 
It seems like nowadays, no company says their constant speed prop is compatible with non counterweighted cranks. I’ve checked composite ones from hartzell, MT, and whirlwind.
I have a Catto prop right now but the plane is incredibly slow for an RV7a. I can barely get it above 152 KTAS. Fastest was probably 158 KTAS. Rigging is fine. It’s just a climb prop was what I was told. So I send the prop to Catto to repitch but I was told that I got a different blade than what they sell now and I’ll only get another 3kts for 2” of pitch. The folks at Catto were nice enough to offer to trial a prop in a couple weeks with the all around pitch and see how they performs.
I’ve wanted to get a constant speed prop in the future was eyeing the Whirlwind 300 or 330 initially and was hoping to upgrade in a year or two or so when funds permit. Seemingly with the whole non counterweighted crank situation that’s not even a possibility and so am I just stuck with a lemon of an engine and slow RV?
It seems like nowadays, no company says their constant speed prop is compatible with non counterweighted cranks. I’ve checked composite ones from hartzell, MT, and whirlwind.
I have a Catto prop right now but the plane is incredibly slow for an RV7a. I can barely get it above 152 KTAS. Fastest was probably 158 KTAS. Rigging is fine. It’s just a climb prop was what I was told. So I send the prop to Catto to repitch but I was told that I got a different blade than what they sell now and I’ll only get another 3kts for 2” of pitch. The folks at Catto were nice enough to offer to trial a prop in a couple weeks with the all around pitch and see how they performs.
I’ve wanted to get a constant speed prop in the future was eyeing the Whirlwind 300 or 330 initially and was hoping to upgrade in a year or two or so when funds permit. Seemingly with the whole non counterweighted crank situation that’s not even a possibility and so am I just stuck with a lemon of an engine and slow RV?
