Originally Posted by Twin-Stack
Almost by accident (it was intended as a budget priced engine) Duke Fox produced one of his best motors back in the early 1960's - the "Blue Ribbon" 35 X. This engine had dual needle roller bearings on the shaft and came, not in a box, but in a "bubble pack." Here is the rarely seen printed instructions which came on the back of the pack. BOB
I had to go look at my small collection of Fox Combat 36X engines. Early versions of the series.
Anyway I had converted one for RC purposes. One engine still has the open intake for use with a bladder or a pressure fuel tank. The other two have the special venturi intake restrictor inserts for slow combat competitions.