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  driving on the highway with canoe
  Posted by: Dr1Gonzo on Jul-23-13 1:32 PM (EST)
   Category: unassigned 

After about 60kmh, the canoe starts to make a whining sound due to wind passing between the roof and canoe - is this normal? Can you still drive on faster or will more wind start to catch the underside of the canoe making it dangerous?

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Messages in this Topic


  Not dangerous. It may be air resonance
  Posted by: ezwater on Jul-23-13 2:07 PM (EST)
with your rack. Try tying some socks over the rack, and see if it breaks up the resonance.

There are a couple of overpriced "solutions" offered if you have Yakima racks. One is to buy a couple of Windjammers, snap on streamlining devices. The other is to get one of the sloping fairing add-ons. On our cars, the fairing attachment tended to interfere with where the canoes sit. So we've used Windjammers.

I don't know if you've done it, but one overpriced accessory I recommend is a set of gunwale brackets. They markedly improve canoe security on the rack.
  Posted by: Dr1Gonzo on Jul-23-13 2:24 PM (EST)
just had it on a set of foam blocks...
  In that case
  Posted by: deuce on Jul-23-13 2:42 PM (EST)
you might try moving the boat forward or back. I've noticed that sometimes makes a difference. You also might try putting pool noodles or other type of foam on thwarts, yokes, etc. for transport.
  Posted by: PJC on Jul-23-13 2:57 PM (EST)
Back years ago when I used foam blocks, I can recall there was sometimes a buzzing from the straps vibrating in the wind that could maybe be described as a whine. It was a little like the sounding of a stringed instrument with the boat/car roof was acting as a "sounding board". Depended a little on wind direction as I recall. Think it was because there was a longer length of strap spanning the roof and exposed to the wind than when using a rack, where the strap is typically very tight to the boat.

It was a little annoying and I suspect it may have shortened the life of the strap a bit. (The "bridge" of the "string" was on the abraded keel of an aluminum canoe which wore at it. I know I used to wear out straps quicker with that rig.) Don't think its really a safety problem as long as you're using bow & stern tie downs and replace straps when there's sign of wear.
  Strap noise
  Posted by: Guideboatguy on Jul-23-13 5:32 PM (EST)
-- Last Updated: Jul-23-13 5:35 PM EST --

If the straps are buzzing, you can easily silence them by putting a twist in each section of strap that is in the air (not touching the boat). It only takes half a twist. You may notice that truckers hauling very tall loads on flatbed trailers often do this as well, for the same reason. I doubt if they are concerned about the noise, but as Pat points out, a vibrating strap is more prone to wear at its contact points, so for a trucker, stopping that vibration can be a good idea.

One of my Royalex canoes recently acquired a perfect imprint of a strap on a portion of one side of the hull. You can see a perfect replica of the strap, including the weave, slightly "polished" into the surface of the hull. I know the strap was plenty tight, so I assume it must have been vibrating.



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