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Old 10 September 2015, 13:16   #1
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Country: USA
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Boat name: Six Park
Make: Mercury
Length: 4m +
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Let air out?

My boat says to inflate to 3.6 PSI, so I pumped it at that pressure inside my garage at around 80 degree Fahrenheit. I am planning to go out to Santa Cruz this Saturday at dawn and come back at around 1pm. The forecast is 54-84 degrees.

Do I need to worry about pumping in more air in the morning, and letting air out in the PM, especially when I am towing the boat and it's under direct sunlight? Will the tubes be much hotter than, say 100 degrees? How often do tubes break due to over inflation?

I have white Hypalon tubes.

Do you guys bring air pressure gauge and pump with you on the water?
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Old 10 September 2015, 21:54   #2
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I always deflate when I put the boat on the trailer, unless I'm towing at night. Starting at home, I put enough pressure in to keep the tubes from flapping. If going through extreme temp changes, I recheck pressure every 20 degree change or so. Watch altitude changes as well. I fill once the boat hits the water, and don't worry about it again until it's out of the water.

Caveat: I have a Bravo pump wired into the boat, so pumping it up is a snap.

jky
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Old 10 September 2015, 22:34   #3
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Yeah I got the wired pump so similar story. I travel with enough air to just keep from flopping if I know I'm going places hotter. Not sure your location or route but you could have some hot hot valleys and a (small) mountain to go over to get to Santa Cruz. (I grew up near San Jose / Los gatos border by hwy 17.

This question has been asked a million times and I've never found anybody with the physics knowledge to give a good technical answer. Have to go dig up a smart high school student

Jason
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Old 10 September 2015, 22:47   #4
zip
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Bravo Pump?

Just Googled it, and came back with a few models.
Are you guys talking about the one for $180.00?

I always keep my tubes low when not I use. I squirt a little air in from my pony scuba bottle, and top off with foot pump.

Now that I have PRVs, I might be a little less cautious.
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Old 10 September 2015, 23:53   #5
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I have the bravo BST that only goes to 4.4 psi. Have a switched wire with a big battery cable connector http://m.summitracing.com/parts/aaf-...FVCBfgodZrEK9g

Jason
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Old 11 September 2015, 00:22   #6
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I am leaving my house at 5am so hopefully there won't be any heat issue while going to Santa Cruz. I'll bring my hand pump just in case the tubes get too soft when it hits the water. I'll make sure I let some air out on the way home. Thanks guys!
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Old 11 September 2015, 08:37   #7
zip
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Jason, where did you purchase that pump?
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Old 11 September 2015, 13:48   #8
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Lot of kite shops have them.

Do a search for Bravo Superturbo BST-12

jky
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Old 11 September 2015, 16:06   #9
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The kite shops are usually the high pressure pumps. I'll have to dig up where I got it.

Jason
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Old 11 September 2015, 18:05   #10
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Inflatable Kayak, Inflatable Canoe, Inflatable Boat, and Accessories by Innova Inflatable Kayaks and Canoes - for Touring, Whitewater, and Adventure.

Is the one I got.

Jason
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