I have made 300+ mile trips with this cover on a Piranha Burn. The kayak
was on Yakima Hully Rollers on the back and Mako Aero Saddles on the
Speed was 70 mph most of the time. There were a few times I reached 80 mph
for less than a minute. It has always stayed secured. I have no doubt that
the cover would stay even at a constant speed of 80 mph. Never heard it
flapping or making any strange noise.
As a side note, the reason I limit vehicle speed is not the cover, but the
rack. I don't like to strain the rack nor the attachment points on the
vehicle. In any case, I always tie a cord between one of the kayak's
handles and the cover's release strap, so I don't loose it in case
something unusual happens.
Hope this helps.
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Answered on 1/21/2013 by Anonymous