I know we have discussed this before but do you guys think an OS 91 FS would be fine for a GP Skybolt or should I go with a Saito 100?

I have expirience with the OS and it have behave with me I have no complains; also I like the extra power of the FA-100 but I heard about having to use heli fuel for Saitos and I don't want to be carrying more fuel jugs to the field, Is this truth?

And no I don't want to go 120 it look like a tummor on the cowl.

An OS 91 would power it well, but it won't have any super power. I flew mine for many years with an old (Pre Surpass) 90 and it flew great.

Now I'm using a YS 91 AC and I REALLY like it better.

I run Wildcat 15% with 18% oil in all my Saitos. They do like 30% but it's not necessary. I may run 30% in my Funtana 90 though

I think I 'll go with the FA-100 and a 16x4.