Here is Butch Patterson's Spinks Akromaster. Butch provides the following description:

Pilot Radio Control Scale Model

SPINKS AKROMASTER, OK Model Co. Ltd.

Purchased 8/13/80

Length- 47.6"
Wing Span-64.9"
Wing Area-573 sq ", 3.98 sf
Weight- 7.6 #
Power-OS61
Wing Loading-29.6 oz/sf

Fast, responsive, somewhat squirelly, not a beginner's airplane.
Designed by Y. Matsumoto.
Built by Randy Franks.

The Akromaster (without Butch).