A ducktail's effect on rear end lift can be measured above 35mph and felt above 70mph. After four wheel drifting at 120mph through turn 1 at SIR in my non-tailed, S front spoilered '72S, I decided a tail is a good idea! An S spoiler is a good balance with a ducktail - for Carrera tailed cars, a Carrera front spoiler or RS spoiler is better.
Randy W
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