Lufthans
Well Known Member
Hi guys,
I'm on the fence with my RV-3B resurrection project - either keep my (150 hp, conical mount) O-320, or turn it into a real hotrod with a Subaru and constant speed MT.
Not wanting to turn this into a Lycoming versus Subaru discussion - I've done several Subaru-powered aircraft and the aircraft I am flying most often at this moment (my Jodel) has one on it. I've put in the required engineering to make this REALLY work. Perfect cooling, runs smooth like a sewing machine and it hauls. If I am fair to myself, I'd love to have this on my -3B as well.
On my Jodel, I cruise my prop at 1750 rpm (4000 on the engine), and the engine with that steep reduction ration has loads of torque. And so I need all the prop I can get. On the Jodel this means 3 blades and 74".
I'm pretty sure that 74" is more than the RV-3 could handle. But would it handle 70"? Or is the typical 68" the limit of what can be bolted on without risking prop strike? I've searched all over this forum but haven't been able to find any answers...
Anyone know?
Thanks!
Hans
I'm on the fence with my RV-3B resurrection project - either keep my (150 hp, conical mount) O-320, or turn it into a real hotrod with a Subaru and constant speed MT.
Not wanting to turn this into a Lycoming versus Subaru discussion - I've done several Subaru-powered aircraft and the aircraft I am flying most often at this moment (my Jodel) has one on it. I've put in the required engineering to make this REALLY work. Perfect cooling, runs smooth like a sewing machine and it hauls. If I am fair to myself, I'd love to have this on my -3B as well.
On my Jodel, I cruise my prop at 1750 rpm (4000 on the engine), and the engine with that steep reduction ration has loads of torque. And so I need all the prop I can get. On the Jodel this means 3 blades and 74".
I'm pretty sure that 74" is more than the RV-3 could handle. But would it handle 70"? Or is the typical 68" the limit of what can be bolted on without risking prop strike? I've searched all over this forum but haven't been able to find any answers...
Anyone know?
Thanks!
Hans