The Great White Mouse
George,
I had great success with the Viojet .91 powered T-38. It flies like it's on rails. I would not hesitate to build another DF version or recommend it to someone who likes this bird despite it's small size. Craniums up (Air Force PC) It hauls the mail both in flight and in the landing pattern.
I also converted one to turbine power (JDE 54) last year. In a rush to prove it's air worthiness, I dorked away the bird on the first flight. I'm still not pleased with my decision to fly that day but live and learn.
good luck
buck