As posted by Alan Brickhaus, and also Brodak's site, the rules have been opened up.
It was: Fox 35 Stunt on Shoestring, Buster or Cosmic Wind, only three options.
Now: Also Flite Streak, Lightening Streak, Brodak 25, and LA 25, a total of 15 combos.
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If this gets back to the Racing ED at Brodak, how about answering this:
How do you use a Cosmic Wind and comply with these four rules?
Cosmic Wind is permitted.
Built to the plan.
2 ounce plastic tank.
Tank in front of the wing.
You can't build it to the plan without having the tank over the wing. You could make a special tank, but that's against the rules, too. You could just build something else, but the rule sayes you can use a Cosmic Wind.
My suggestion is to change the rule,
FROM: Tank in front of the wing,
TO: Tank where the plan indicates.