What would give a 4*60 infinite vertical? I have a TS91AR on mine and i dont know if that is enough to give it unlimited vertical.

I had an OS 1.08 on mine and it had plenty of power.

I got a WM Superchipmunk with a ST G90, not enough for unlimited vertical, I think a minimum of 100 sized 2C is a must! Perhaps any 90-100 sized engine that can comfortably throw a 14x6 at about 12,000 RPM would do the job.

A ST .90 will do the trick. My friend has one and it pulls it with athourity