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@xavierdisley published a graph showing something like 5s per kilo for the best (in his test) pointy hat vs. some random road helmet. If you can get that much benefit, you could be looking at a 1s improvement, assuming the same ~28mph speed. Obviously you'd hope to be going quite a bit quicker than that, so the time saving would be smaller, but it could still be several tenths.
gbj_tester
dan
Aerodynamics mandems - any idea what the saving will be for me wearing a sperm hat for a flying 200m TT versus a normal helmet (kask vertigo)?