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Old 06 April 2014, 13:52   #1
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Country: UK - England
Boat name: Son of a Beach
Make: Avon SR4
Length: 4m +
Engine: Mercury 50hp
Join Date: Sep 2012
Posts: 130
Anyone fitted a keelguard to an SR4 or similar?

If so how far did you take the keel guard back? - I'm trying to work out what length to go for.

Also has anyone used Keeleazy as an alternative?

I'm just figuring out the best way to protect the hull on a drying mooring...
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Old 06 April 2014, 14:52   #2
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im also quite intrested as the mooring i keep my sr4 no longer has sand underneath :L not ideal having it dry out on sharp rocks im half temped to flip it over and lay a layer of mat on the length of the keel but depends on time really
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Old 06 April 2014, 14:58   #3
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We have a 6" wide one I think left over from the MacRib project. It's not an east job on an SR because of the chines, drain holes and planing pad.

I think you bought the Orange and Cream SR4 that I looked at, nice boat that.

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Old 06 April 2014, 15:04   #4
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Country: UK - England
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Yep orange tubes and whiteish hull. Nice, perhaps a little on the expensive side but had everything I wanted and the owner seemed pretty genuine. When you factor in diesel in to going to look at boats etc it seemed worth going for. Just a few chips in the gel coat to go over as it'll be living in the water a lot. Also toying with the idea of anti fouling, but not sure.

How long is the 6" wide keel guard you have left over? And what kind of donation would you want?
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Old 06 April 2014, 17:16   #5
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Hi, my name is Mark... This is my first post on RIB Net. Hello all.

I worked at Yamaha Motor UK Ltd for 16 years, latterly being responsible for Marine Special Projects, where we fitted KeelGuard to RNLI Rescue Water Craft amongst a number of others. I recently decided to leave Yamaha to start my own business, and am now sole importer / distributor of KeelShield for UK & Eire (amongst other products).

I can add a few details that my assist Tim with his enquiry (and will try to do so without doing a sales pitch!)...

I supplied a 6' Black KeelShield to Rib 4 Macmillan in support of the fabulous work they were and are doing with a great Cancer Charity. I guess it is a KeelShield (rather than a KeelGuard) that is being referred to. I had a conversation with R4M about selling it to raise money for the charity. The RRP of a 6' KeelShield is 149.95.

Both KeelGuard & KeelShield are 5 inches wide. Visually KeelGuard and KeelShield have different profiles and are made from different materials. KeelGuard is made from a more rubbery material and KeelShield is made from a urethane. Both are available in a variety of lengths. Both benefit from fitment when the protection strip and boat are warm & dry (70 degrees ideally) - this both for flexibility of the strip and maximum adhesion.

Both products recommend pre-cleaning the boat with an alcohol before fitting - KeelShield insist on Isopropyl and nothing else (as other alcohol solvents can leave a film). From memory KeelGuard are not so insistant. The SR4 has strong chines right up to the bow, so either strip would be under more strain than if they were stuck to an "unchined" bow. Personal Watercraft also have strong chines and can have hull protection strips fitted, although I concede an SR4's chines are sharper & more regular. KeelShield recommend using a PU product such as Sikaflex to add extra strength and protection to the edge of the strip. When I was with Yamaha, we took the decision to do this with KeelGuard aswell after a few issues with lifting adhesive.

Regards length, in general, from under the U-bold / bow eye to the first full load bearing keelroller is recommended when used regularly on a trailer. The reason being that with a sticky keelroller on one side and a boat on the other, movement may be taken up by the hull protection strip, eventually potentially causing the adhesive to blister (a bit like going for a long walk in your wellies with only one pair of socks on...!). If being kept on a drying mooring then this may not be an issue. I'm not familiar with the full hull profile on the SR4, but theoretically, a KeelShield could be fitted to a RIB's full keel length. A personal watercraft has a similar changing hull profile to a pad, as the vee-hull changes to flat profile for the jet intake. I've never known a problem with adhesion in this area. The drain holes could certainly be an issue. Both products can be cut if required (don't use a saw as the dust will stick to the adhesive).

The KeelShield installation video may assist and can be found here: .

My company has a facebook page which has various pics and images on it (most recently 8 photos from an installation of Kevlar KeelShield with C-Fury): https://www.facebook.com/specialistsmallcraft

If you decided you wanted to have a hull protection strip on your SR4, it certainly wouldn't be the most straight forward hull to fit it too. Ultimate adhesion would I think depend on the preparation, temperature at time of installation and fitting as much as the product. KeelShield is available from all good Dealers - Yamaha Dealers especially will know me. If they have a warm dry workshop, they should be able to fit it for you too if required.

Forum members will of course be able to advise you from their personal experience of course, but I hope this assists.
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Old 07 April 2014, 03:17   #6
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I have a roll of this gear that Mark donated to the macrib. I have had a talk with Mark and we are going to do a little test on his product. We will be putting some on a small tender I have here and I'll be towing it up the drive without a trailer to see how good it's abrasive qualities are. Pics will follow.
You might think that the band is pricey but repairing a keel to it former glory would cost a a whole lot more.
As mark has pointed out some boats have chines that may make it difficult to fit the band satisfactorily. We can have a look at macrib when we have our meeting as I think this one will be the most difficult that you will encounter. If it's doable then I'll fit it. Pics will follow
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Old 07 April 2014, 07:25   #7
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Country: UK - England
Boat name: Son of a Beach
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Thanks for the above so far, very useful. Has anyone on here fitted any of the above products to an SR4? Or even a bigger SR?
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Old 08 April 2014, 00:45   #8
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I have fitted them to both a 4.0 and a 5.4. the one on my 5.4 has come loose and i ended up removeing it. as stated earlier it is really tough because of the chines on the seariders, Flip the boat over, will make things a lot easier and a better job. the 4.0 isnt as bad as the 5.4. to apply, there arnt as many chines to cover, what i did is where the guard comes over the chine i used a razor knife to to slice it so it would sit nice and flat. On the 4.0 i had the guard extended almost 3/4 the way back on the boat. the 5.4 ended just a few feet back from the bow. Lay the guard out and dry fit it a few times, look for any spot that will give u problems. its really only going over the chines, thay dont allow the guard to lay flat and they will fail and start to come loose. I used a hair dryer and applied it in direct sunlight so it was nice and pliable, definately helped. I did have to cut a couple notches in front for the holes but just a little, my guard wasnt wide enough to completely cover the holes. Follow directions , scuff the hull good. and be carefull when u use the primer cleaner they gave you, the applictaer fell apart while useing it before i finished the job. I started applying from the bow back. had marked out where with a pencil so i knew the glue and guard would match. and just press tightly for good seal. also they dont recomend guard not contact any roller on trailer..., hope this helps
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Old 08 April 2014, 03:13   #9
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Thanks for the extra tips.
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Old 11 April 2014, 07:05   #10
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