RE: O.S.55AX whos got what with what?
I already have two planes with the OS .55AX. The first is a Hangar 9 Ultra Stick 40 and the second is a kit built Rookie look-a-like called an SR-41. Both engines are nearly a year old and have run flawlessly since day one. Today I purchased another .55AX for the new Great Planes Revolver which recommends a .55 two-stroke at the top of its range.