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Old 21 May 2022, 17:09   #1
Country: UK - England
Town: worthing
Join Date: May 2022
Posts: 1
Tube Pressure - Merlin 17

Hi I have just got a Merlin 17 rib.... Its Hypalon

Im trying to find out what the 'default' pressure should be. in morning/end of day it deflates (I know this is expected with temp change) but it does it a little too much and I feel and loses its shape a little (see pic) so I want to top it up.

PS when the suns out its pretty firm.

Also I was thinking of adding safety release valves as a safe guard - not sure if I can retro fit anything (see pic)?


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hazardpro is offline   Reply With Quote
Old 22 May 2022, 07:17   #2
Country: UK - England
Town: Southampton
Boat name: rocinante
Make: tornado
Length: 4m +
Engine: 40hp tohatsu
Join Date: Jun 2010
Posts: 269
2-3psi is a typically working pressure. You can fit pressure relief valves which make sense in hot climates but in the UK if you store the boat with a cover / out of the sun and let some air out as the weather gets warmer you shouldn't have any issues.

rik_elliott is offline   Reply With Quote
Old 23 May 2022, 14:32   #3
Country: USA
Town: Dixon
Boat name: "H8 2 Swim"
Make: monaco yachtsman
Length: 4m +
Engine: OB
Join Date: Dec 2021
Posts: 67
3.2 PSI is standard good pressure. Under becomes too soft when you put it in the water. Never go above 3.5 as it begins to stress the seams. Watch the pressure i the hot sun. Over pressure valves are a good idea in hotter climates or if you travel to altitude. Saw a boat on the side of the road with blown tubes.
GARYSHORT is offline   Reply With Quote

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