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Old 02 May 2015, 03:48   #1
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Deflate the tubes for long distance towing?

I'll be towing my 440 Hurricane to the West Coast and back this summer. It is going to be about 5800 km round trip. Would it make sense to deflate and tie down the tubes for this sort of trip? I'll be driving over some mountain passes and deflating removes any expansion risk, the 440 doesn't have pressure relieving valves. I'm also thinking that the deflated tubes might be more aerodynamic behind the tow vehicle.
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Old 02 May 2015, 12:57   #2
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I think you have answered your own question really. Yes, I agree with you, let the tubes down, secure to stop any flapping. They may well burst otherwise up in the mountains! Save some fuel due to less drag in the process! Enjoy your trip!
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Old 02 May 2015, 13:16   #3
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Quote:
Originally Posted by headdamage View Post
I'll be towing my 440 Hurricane to the West Coast and back this summer. It is going to be about 5800 km round trip. Would it make sense to deflate and tie down the tubes for this sort of trip? I'll be driving over some mountain passes and deflating removes any expansion risk, the 440 doesn't have pressure relieving valves. I'm also thinking that the deflated tubes might be more aerodynamic behind the tow vehicle.

Pump out all the air this way the tubes won't flap but keep the bow chamber inflated
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Old 02 May 2015, 13:19   #4
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I dont think it will make an aerodynamic improvement. Your driving at towing speeds and its following you.

Id leave them pumped up (perhaps a bit soft if your really going over a high pass).

Saves flapping about, saves having to secure them down, saves having to pump them back up again.

I towed my boat to Corsica and left them pumped - Id not bother letting them down.
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Old 02 May 2015, 16:14   #5
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It won't be oversize, so it is better around for the tubes to stay inflated. No matter how well you secure them they will start to chaff somewhere! Check the pressures at the passes. Road grime can be hard to clean off where the creases in the deflated tubes are for some reason.
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Old 02 May 2015, 19:22   #6
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I leave the tubes just firm enough to hold shape (and verify by looking for a little bounce in the mirrors.) Going cold to hot or changing altitude calls for a check every now and then (on a tow from the SF Bay Area to Tahoe, I ended up stopping more than half a dozen times to release pressure, and once after the pass on the way down to Tahoe to put air in.)

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Old 02 May 2015, 20:04   #7
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Altitude is a bigger issue that heat in my opinion. Driving in CA is normal to be 50 degrees and foggy at the coast but 110 degrees 30 minutes inland

Going to Tahoe I saw a much bigger changes in pressure with altitude than with the heat.

Better safe than sorry

Jason
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Old 03 May 2015, 15:37   #8
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Agree, Jason, but I've also left home in sub 50 degrees, and drove through Santa Rosa at 110; tubes will overpressurize if taut to begin with. Which is why I always lower tube pressure before trailering (unless starting out in the evening.)

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Old 06 May 2015, 15:02   #9
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I have talked to an engineer at Hurricane and he said that deflated towing was fine and that it would be better than towing with the tubes under inflated.
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Old 06 May 2015, 15:12   #10
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My advice would be to use a pump to remove all the air from the sections. While they collapse, fold them up into the GRP carrier section (where they are attached) and secure them with ratchet straps or similar covered with pipe lagging or another soft material. Tie in the cone ends with soft rope running loops. It removes all the issues with heat, altitude and flapping. It also makes for a much more manageable package on the road.

In this job, an electric pump is your best friend!
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