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Old 14 May 2012, 17:25   #1
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Avon FRB

Anyone know the inflation pressures for a Avon FRB from the nineties, its the 3.8 meter boat with the roll up aluminium slat floor and pressure relief valves.
I need to get hold of the pressure relief diaphrams as one is leaking and torn, any help please.
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Old 19 May 2012, 11:16   #2
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Avon E R B

Cleaned it up yesterday with tube cleaner and conditioner and it looks great but it did take me all day scrubbing.
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Old 19 May 2012, 13:32   #3
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Your Avon is not unlike my Zodiac Mk11CGT (3.8m with aluminium floor.) From memory it was 240mbar for sponsons and 220mbar for inflatable keel.
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Old 17 April 2015, 04:59   #4
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Hi, I have recently purchased the same boat and I'm struggling to find the correct inflation pressure for the tubes.
Did you ever manage to find this out?
I have just bought a 20hp 4 stroke to go on the back of it but when I open the throttle to try and get it up on the plane the tubes start to crease at the back and the transom dips back towards the water.
I'm not sure if its because I'm not pumping the tubes up enough or because the engine is to heavy for the boat.
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Old 17 April 2015, 05:26   #5
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Unlikely to be different to most other SIBs, try 3.2 to 3.4 psi for the tubes.
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Old 17 April 2015, 05:28   #6
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As a general rule I'd start at 2.5psi then go up maybe as far as 3.5psi, just because Avons in general (ribs and sibs) usually run 2.5psi upwards.


Has yours got the pressure release valves and have you got a pressure gauge? A gauge is essential as you'll be surprised how hard the tubes are at 2.5-3.5psi. You'll also be surprised how much it getting colder when it goes into the water will drop the pressure.
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Old 17 April 2015, 05:38   #7
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Thanks for the response guys.
The tubes have pressure relief valves on them but I was unsure how they operate. I didn't know if they are a one time pop or if they reseal.
I have a pressure gauge as well which I have been using to check the pressure whilst inflating.
I first started at 2.5 and this was no where near enough so I went up to 3 and although it is a lot better the creasing of the tubes and transom dip are still there.
I have just been taking baby step because I didn't want to damage it.
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Old 17 April 2015, 05:48   #8
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The last 1/2 psi is critical and makes all the difference.
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Old 17 April 2015, 07:26   #9
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You should be able to go a fair way over 3.5psi without damaging it as well. I picked one of my boats up from repair and it was pumped up to 5psi without any issues. The PRVs will cut in way before that-and the PRVs will just drop the pressure to their cutoff point.
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Old 17 April 2015, 13:04   #10
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Avon FRB

I fear the 20hp 4/s may be too heavy, I had the same boat briefly a few years ago. Really its a flood rescue boat designed to be unpacked and deployed quickly on flat water.

The slatted aluminium floor doesn't provide any structure unlike a solid ply or alloy deck or a high pressure air deck. I didn't keep it long for this reason, my engine at the time was a 10hp 2 stroke (i think).
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