-- Last Updated: Sep-26-12 1:05 PM EST --
Ive had this happen once in a strong cross wind. I didnt know what happened at the time. A different time I noticed the canoe shifting slightly in a strong cross wind so I stopped and found that my ratchet straps had loosened up just slightly and that was enough to let it move around. I re-tightened the straps and was fine for the rest of the 4 hour trip.
I was using the 4 foam blocks.
Also if you're using rope as a tie down some nylon ropes will stretch. Use a non-nylon rope.
Other thoughts: you could cut the groove deeper on the front set of blocks so that there is less distance for it to pivot on.
You should be using 3 straps. If youre only using 2 add a center strap. Using a round rope will be much quieter than a flat webbing/ratchet
You could move the canoe back on the car so its centered closer to the rear, thus reducing the lever length for the wind to push on so it should be more stable.
Kayak Deck Gear Bags
Classic Freestanding Rack
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