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Old 29 August 2014, 06:35   #11
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Once again thanks all. Yep Martin it was your thread that got me thinking and like you say never thought it was a problem until it was mentioned. (Cheers mate :thumbs) You like me, you have prob got a short shaft - but like mine its 17 inch which is just that bit too long for most Sib transoms. I think like you I will raise a few cm's maybe more and see how it rides (don't really want to drill more holes if need to but if it makes a big difference will do).

Re keel inflation I don't think it's that as I have been under inflating keel and still had this issue (had other issues too!!). Reading all different internet articles it seems that the best height for the anti vent plate is around level with bottom of transom or even higher so you like me are well below that by 5cm. Interestingly some articles were saying that although in a similar situation to ours they raised the engine and then had more problems so it may not solve all the issues. I think it just giving it a try and see what happens.

I'm learning that boating is just one big learning curve that prob will never end!!!!
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Old 29 August 2014, 06:46   #12
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Couple of photos admittedly not very good showing my out of the box 3.5 AE Honwave & 20 hp Tohatsu shortshaft. Absolutely no issues with splashing with this setup either solo or with 5 people aboard.

I hope this helps!
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Old 29 August 2014, 07:13   #13
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Chris...ha ha I am also discovering its a very steep learning curve!!!

Lookin at the pictures of Paddlers boat, that would appear to be the way forward. I mentioned the keel pressure (over inflation) cause I had mine pumped up very hard whilst I was away a week ago and was just wondering if over inflation could be a contributing factor.
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Old 29 August 2014, 07:32   #14
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With regard to pressures they were spot on prior to putting it in the sea & I didn't top them up as I'm more concerned about the thing blowing a seam when it's sat on the beach in the sun which it did for two weeks when not used !!!!
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Old 29 August 2014, 07:38   #15
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Helpful pics Paddlers - reinforces the thinking that level with bottom of transom is where it needs to be. I also worry about too much pressure on boat so end up inflating then letting air out and then inflating again etc... Pain in the butt. All Ribs should have pressure release valves as standard - save the worry!!
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Old 29 August 2014, 07:57   #16
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I agree about the pressure release valves. If I lived near someone who could fit them I'd have it done, the tubes feel rock hard when they get the sun on them and it's a pita taking the pressure gauge/pump every time you want to use the boat.
For the relatively small cost to the manufacturers and the catastrophic cost of a blown seam when on holiday you'd think they'd be standard !
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Old 29 August 2014, 10:56   #17
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Originally Posted by paddlers View Post
With regard to pressures they were spot on prior to putting it in the sea & I didn't top them up as I'm more concerned about the thing blowing a seam when it's sat on the beach in the sun which it did for two weeks when not used !!!!
It can be an issue. I partially deflate my RIB when it comes out of the water on a sunny day.

I have an on-board electric pump, and top the tubes off to working pressure after splashing the boat.

FWIW, I bought some OP valves a while back, but haven't gotten around to having them fitted.

jky
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Old 29 August 2014, 11:26   #18
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JKY I've thought about these quite a bit but I'm a wimp when it comes to hacking into a perfectly good tube to fit them!

They would solve the main issue which to me is pumping the boat up to pressure on cold water then bringing it ashore which we do a lot to let the kids snorkel/fish from the shore. To that end I content myself with hitting pressure ashore before we set off and tolerate the cold water drop in the knowledge I can to some degree relax about the thing going pop!

Not that it gets that sunny but the tubes do seem rock hard in no time!
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Old 29 August 2014, 12:50   #19
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Just take a deep breath, Stanley knife, small pair of scissors, and fit these;

NEW A 6 Leafield Air Pressure Relief Valve Boat Rib Inflatable Marine Sib PRV C7 | eBay

Took me half an hour to fit 3, once I had plucked up the courage to start

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Old 01 October 2014, 15:03   #20
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I am having the same issue with mine, a 40 Marina where at high speed getting a lot of spray over the transom. I'm a complete newbie, can you explain how I alter the height and trim?

thanks
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