The article I read didn't specify Lexan, just said "plastic". You're are probably correct... The article also said that the exemption was granted because the builders argued that they couldn't use heavy safety glass and still get the thing airborne. Sounds like they're cutting it pretty close on the ol' power-to-weight ratio!
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Quinn, Son of a...
Build LogQuinn the Slotus:Ford 302 Powered, Mallock-Inspired, Tube Frame, Hillclimb Special "Gonzo and friends: Last night must have been quite a night. Camelot moments, mechanical marvels, Rustoleum launches, flying squirrels, fru-fru tea cuppers, V8 envy, Ensure catch cans -- and it wasn't even a full moon." -- SeattleTom