Terry,
I've got a super tempest that was designed in the late 80's by Rodger Barret. I also have the original full size mylar.Rodger used a
OS MAX .46VF reworked by Leon Demosky (great engine run)plenty
of power and good fuel milage. I have three or four of them myself.
Anyway,the super tempest is a very competitive for precision stunt.