The original Byron prop drive was made for a .60 engine and used 2 little Gates V belts..It could be ordered with different diameter pulleys, depending on engine..I reworked one for a .90 SuperTigre, still not very powerful..We had one with a Gates 3/4 wide tooth belt on it, worked better because the tooth belt didn't slip..There is no way a Q100 would even fit on the original belt drive, hanging on the end of a 3/4 aluminum tube on a 1/4 firewall in a foam fuselage...the Purr Power was next, direct drive,an aluminum can with a fitting that went to the engine..It was made for the Sachs 4.2..The Purr power was mounted to the fuselage with 2 half circle mounts to 2 firewalls..This would hold a Q100 if the pipe to the can was reworked...There is no reason to use a reduction drive on a Q100 unless you are planning to put it in an ultralight..The original Quicksilver ultralights used a 100 cc Yamaha.. .A Mick Reeves belt reduction on a G62 will turn a 30 inch prop, so with a Q100 on a belt drive the prop would be too big to clear the ground...
Pictures on the Iron Bay Models website...