I bought a YS-91-C for sport flying on a Sig Hog Bipe.

I bought an OS-F plug, a Zinger 14X6-10 prop for break-in and a Zinger 15X6-10 for after break-in.

Now for the hard part, what fuel???

I have been reading for some time now many debates over synthetic; castor; synthetic castor combination.

Every engine expert, every fuel expert, and everyone inbetween all have very different opinions of what is best.

The YS manual states 15-20% synthetic or castor or a combination can be used.

What oil do you recomend and at what percent min. / max.

Also is 15% nitro okay for sport flying, I know most people use 20% but I do most of my flying about 1/2 throutle most of the time anyways.

Thanks for any help in this matter,
Tim