Re: Propster

["John Burk" <joyseydevil@comcast.net>]

We once did a pull test on a Paraplane (the original motorized parachute)
which had twin engines  and coaxial counter rotating props - With both engines
running the pull was 85% of the combined total when the engines were run one
at a time - The sound of those counter rotating props was fierce - Paraplane
eventually changed to one engine driving one prop .