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@d_m
Im not sure the aerodynamic gains at 50kmph are particularly strong against the above reasons. Racing motorcycles are going up to 300kmph! Those who have attempted speed records on bikes typically havent used them. My very crude scientific understanding is that they create too much aero disturbance and would need something at the back to offset it.
I think on a TT a decent helmet, good position and modern skinsuit are more critical.
That damage looks like someone has attempted to cut the frame in half?