Thanks for the reply Mark. The wing is a flat airfoil. When the motor mount broke, just the motor fell off & I was able to softly land in my neighbors' sandy horse arena. The mounting stick is solid and unchanged. A new motor mount, A beefy one, and a few cosmetic patches where the prop hit the foam before becoming detached was all that was needed to fix. I've always set the thrust line at 0 deg. on all of my other pusher jets, but I will recheck the thrust line and maybe try your suggestion to add some slight up thrust to the motor. I've always used the LAR, (looks about right) method and maybe it wasn't about right. I love cold war jets! This plane has such a mistique and strange history, that a complete airframe wasn't preserved for a museum boggles the mind!! Your planes look great!! Thanks again for your time and suggestions. I'll let you know how things turn out. Happy flying.

Rick