1/2 A DF
Jetpack,
In 1980 I built a Midwest A-4 Skyhawk( foam fuse and built up wing)-it flew pretty good on just 2 channels(aie@elv)-it was bungee launched-had a midwest .049 fan with a TD .051 for power-it flew about 50mph.I think Bob Kress built the fan.
Jackjet