Thanks for the reply!

I understand the cooling head issue. Too much or too little airflow around the head will change the engine temps. I think the fan should be able to suck air around the engine and cool it effciently. That's something I'll just have to figure out later.

I also understand the RPM thing. If I spin the fan blade faster than it's designed for, it will explode. There is certainly a potential of that as my engine IS stronger than the O.S. Max .15CVX-DF.

That's why I've chosen to ask this question here. You guys know your ducted fan blades -- I don't. Is there another ducted fan blade made for nitro engines that is tough? Do they make them out of fiberglass or anything? The above one is plastic. The only requirement is that it's 3-4 inches in diameter.

I don't know where to start or where to search. Google turns up exactly squat on nitro ducted fan blades.

Thanks again for the help!

-RobH