Walther

My Feedback: (1)

I have ordered a diesel head for my Norvel .074 and would like to know what prop I should use on it.
The guy I talked to at NV said 7x3 the same as glow. It seems to me you can run a bigger prop then that.
What say you?

Hobbsy

My Feedback: (102)

7x5 or 8x4 should be perfect, this trying to judge downward from .10 engine and upward from an .051.

Lou Crane

Walther, I'd go with Hobbsy's suggestion. The NV guy may have had in mind that the engines are designed for more RPM than most others. That suggests a smaller prop than you'd think - to let it rev.
I've converted a few aluminum fin NorVel .8cc and 1.0cc engines on the bench; MECOA diesel heads. Ran fine! Spun up pretty high RPM, almost up to the glow versions. Didn't push for absolute max RPM, just checking that the combo worked, and was reasonable to start, set and adjust. APC props, homebrew 33%E, 23-25% O, rest #2 auto diesel, +1.5% AMSOIL cetane booster.

Walther

My Feedback: (1)

Thanks guys; I ordered this head from NV so it should be interesting to see how it starts and runs.

Tom.