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Old 29 November 2019, 07:35   #1
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Country: UK - Wales
Town: Llanfairfechan& Collioure
Boat name: Spirit of Adventure
Make: Tohatsu &Quicksilver
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Engine: Outboards 25hp & 9.8
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Have I got a problem?

I am after a bit of advice from your experience please. Having searched posts and not found anything specific enough, I hope you will indulge me.

Bought my mini rib several weeks ago and she lives in the garage.
Flat calm in the bay this morning so I decided to get out on the water. Sadly, foiled by the council who, in their wisdom, have locked the floodgates on the slipway.
However, I noticed that the tubes have gone decidedly squidgy. I appreciate that temperature will affect the pressure but the temperature today is only about 4 degrees lower than when I bought her less than 2 months ago and there has been no high temperatures in the interim. This seems too small a change in temperature to cause such a drop in pressure.

Should I go back to the supplier or would you consider this level of deflation normal?
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Old 29 November 2019, 07:58   #2
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Country: Other
Town: Lima-Peru
Boat name: Nautile
Make: Sea Rider 450 Rib
Length: 4m +
Engine: Tohatsu 5/18/30 HP
Join Date: Sep 2007
Posts: 1,871
Need to ask yourself if the tubes were inflated to their working pressure factory recommended when bought the boat to start with. All tubes lose pressure on cold days that's why you need to pump tubes once combo is on water back again to their working pressure. Need a pressure gauge for that..

If suspect there are air leaks spray soappy water on the tubes and air valves to check that out..

Happy Boating
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Old 29 November 2019, 08:03   #3
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id say just temp lower, 0.003 bar / 0.045 psi = 1 degree temp rise of air in boat tubes. you've lost about 6% in volume @ 4 degrees i reckon assuming 3 psi when you pumped it up in all chambers
i would blow them up again to pressure and see assuming you have all the dust caps fitted [secondary seal] of course
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Old 30 November 2019, 11:21   #4
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Country: UK - Wales
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Boat name: Spirit of Adventure
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Length: under 3m
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Thanks Gents. Useful advice for me there. I shall buy a pressure gauge and monitor pressure and temperature regularly.
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Old 02 December 2019, 10:03   #5
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Country: Other
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Boat name: Nautile
Make: Sea Rider 450 Rib
Length: 4m +
Engine: Tohatsu 5/18/30 HP
Join Date: Sep 2007
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Quote:
Originally Posted by Pecheur Anglais View Post
Thanks Gents. Useful advice for me there. I shall buy a pressure gauge and monitor pressure and temperature regularly.
Yep, best investment ever, all what's been glued on tubes, transom related will last well glued for years to come including better fuel consumption, boat rigidity and much better water performance on most water conditions.

Happy Boating
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