I'm Paul Smith & I know both Dave Jones & Marvin Denny. We didn't have Foxberg in Wichita in the 1973-1977 era.
They currently have a Foxberg event at The Brodak Fly In in Pennsylvania. In 2005 they were using Shoestrings, Busters and Cosmics with Fox 35 Stunts. The event was spiraling into nothing because only a few people were able to get decent consistant performance with the modern low grade Fox 35's. The engines were opened up to include the lower-price/higher quality LA25 and Mr. Brodak's new 25. The event is alive and well as of yesterday.
The airplane menu now includes the Flite Streak and Lightning Streak. I'm not running the thing, but I would also include other big sport planes such as the Ringmaster and Sig Skyray. Back in the day, when Carl Goldberg kits were $3.95 and Fox 35 Stunts were $16.95, Foxberg was a good economy event. The organizers need to look at the economy of today. Goldberg designs, as well as the Flite Steak & Ringmaster call for specialty machined-balsa parts that most people can't get.
Altough I knuckle-under and comply with the rules, a certain fuel tank coupled with minimum pits stops is a redundancy.
Likewise, a suction tank, outboard tank, and stock venturi size really hits the same issue with three hammers when only one is needed. In the absence of a pressure system, you can't open up the air intake very much and still get off the ground. Drills and grinders are not controlled substances. Anybody can hog out a venturi and see what happens.