Jim....

Right now, am working on a Modelcraft Spook circa 1941 and original plan says Zero degrees of downthrust when using an O&R 60. Fellow from Washington who has built several of them through out the 1950's says that does not work unless you want a lot of loops once engine gets up to full power. So he adds in 8 degrees of downthrust, and adds power, and on ocasion goes up to 16 degrees downthrust to control things, if he has a good running engine. He is a bit too old to try anything else, but knows the big downthrust stopped things getting away from him.

I would like to go a bit more modern power, and maybe less downthrust too.


Wm.