ORIGINAL: BMatthews
Yes they do. And you can set up the combo for either low or high speed as I understand from reading about the issues.
Well, I got copies of the older P.E. Norman D.F. experiments, but most A/C are British Hawker types, and his plans always seem to NOT show up the C.G. They are over the top on glow engine power, and how to built this thing (like a fan) in trippliate in alternatives.
Wm.