Dave,

I'm about to trade in a Saito 91 on another YS 63S. The only reason why I bought the Saito is that my uncle gave me one that turned out to have some problems but I had already bought the set up for it. So now i'm spending even some extra money to get an engine I can count on. Anyways, I bought some Pro Zinger 14x5 props for the 91, could I use them on the YS 63S? How do you think the 63S compares power wise to a Saito 82 or 91? I've heard they're just as powerful as a 91 despite the fact they can't turn as big of a prop.

I always tell people that if a particular prop will turn in the right rpm range, try flying it.

The 63's like to run best above 11000. I like them between 11500 and 12500. You need to test it and see if it works for you. My feeling is that the 14x5 will be too big, but what do I know?

Some guys run the 63 at 10500 and are perfectly happy with the performance.

YOU be the judge!

Sounds like you know a lot. I follow this forum from time to time and I think you have the best customer service and knowledge. If there was an award for best support forum, I'd nominate and vote for you.

Well thanks, I appreciate that.

YS engines require that we provide a lot of info. They are a little more complex than the average model engine, and can be a little tougher to figure out, but the end result is serious performance for the modeler. It's kind of like anything that makes a lot of horsepower, it requires more attention.

Good Flying!

Dave