RE: STORMER design by Doug Spreng,
I think it would be more accurate to say that the Sr. Falcon looks alot like a Flattop Stormer.
Doug Spreng was the inventer of the digital servo for modeling. A very good write-up on the early development of Digital proportional radio is here:
http://www.modelaircraft.org/museum/bio/Spreng.pdf#search='doug%20spreng%20ama'