Hi Weedfix

I think the first thing I would like to know is what pattern plane are we talking about? How much does it weigh?

IMO, I would get the YS110. The engine has more power than the others and a better throttle. As for the vibration, don't worry about it. If the model will let you soft mount the engine, do that. If the model doesn't allow for an easy/not expensive soft mount (a model that has a removable cowl. Eg. Swallow, etc) then hard mount the engine.

My advise for beginners is to buy the best engine and radio gear that you can afford. It can then be moved into other F3A planes as you get better at flying them. (or it is time for a new one)

As for the 25% fuel ....... I think it is a matter of opinion and how good you are at tuning your engine. I have successfully ran YS engines (91AC, 120FZ, AC, SC, 140FZ and L) on anything from 10% - 25% nitro. More nitro makes them a little easier to tune with a better idle. (That is not to say the idle on 10% is unreliable....it is!) I would run the YS110 on 15% nitro and see how is goes. Start with a 13-12 or 14-10 prop and go from there.

You will get a lot of pattern advise and opinions. This is one of them.

Cheers

Buzz