power

[fast_hydro]

dose a boat engine have more power than a plane engine (.30boat = to a .30plane engine)
and if so would the .30 out of my boat have more power than my .40 out of my plane (there both os max s i think)

[Hydro Junkie]

The biggest difference is the RPM rating. A marine engine will turn a lot more RPM than an aircraft engine. If memory serves, an airplane engine usually tops out at around 16K, while a good marine racing engine turns better than 23K. To go any further, you would need to go to the OS website and check the stat page for both your engines.

[Doubledog]

In my experiences it was a total waist of time getting a plane engine to turn a boat prop. No Rrrrr's.

[Watercadet]

The biggest difference is the RPM rating. A marine engine will turn a lot more RPM than an aircraft engine. If memory serves, an airplane engine usually tops out at around 16K, while a good marine racing engine turns better than 23K. To go any further, you would need to go to the OS website and check the stat page for both your engines.

A good marine motor is turning a lot more Rs than that, more like 30k under load. And no aero motors in boats you say? You didn't forget about sport 40-I did you?
Adam

[Hydro Junkie]

I was using what I knew to be top end for the .67/.82 sized boat engines from OS as a baseline for the 23K figure. Last I knew, the .82 listed at 23K and the .67 at 25K. As for the Sport 40-I, it used to be a factory modded airplane engine with the water cooled head. I have an HB 20 marine that is the same way, an aircraft engine with a water cooled head with a top speed of 16K. Bought it back in 1982, when I was young and stupid for my 30" Dumas Pay N' Pak. Might explain why I could never get it up on plane. Too heavy of boat and not enough power to get it there

[Watercadet]

OS are great motors for reliable easy to tune power. That said, their motors are not known for high numbers.
Adam