RE: Great Planes Super Skybolt ARF
My ST 90 is using a 14 x6 apc now and I am going to try a 15X4w apc but I doubt it will want anything to do with a 16. Mine has never really impressed me with its power. When I had it on a Goldberg Extra it flew best with a 13x6 turning more rpm. I know thats not what you wanted to hear.