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Old 03 November 2018, 16:23   #1
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Avon sr4 of unknown vintage

Hi I have been lurking on here for a while eventually decided to ask. I bought this sea rider as a project and for pottering up and sown the canal mainly. But now thinking of taking it in the estuary and out to sea. I am wondering if anyone could identify a possible age for it from the pictures as I cannot find the hull number. Also do you think it would be a good or bad idea to cut a hatch in the floor near the transom and build a sump for a bilge pump? Would it affect the transom and or floor strength a lot?
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Old 03 November 2018, 16:57   #2
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Avon sr4 of unknown vintage

I would say from the logo itís an old one!! I have the same logos on mine and itís serial number predates the newer serial numbers where the last two digits represents the year of manufacture. Do you have any numbers? Some have an Ali plate on the transom and others stamped onto a hypalon strip in the bow.

As per a transom well I am not sure. Later seariders have transoms that run all the way down to the keel but earlier ones stop at the deck. Although it is a pain there is no well, I would be concerned about chopping the deck there as the transoms are not the thickest as they are. Most people find an elephant trunk drain to keep the deck free of water whilst underway.

I think there is a rebuild thread somewhere on here where someone built a transom well but I think they also replaced the transom?
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Old 03 November 2018, 17:20   #3
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Can't see anything on the transom where it should be because someone has added a nice piece of electrical conduit to the top of the transom presumably for reinforcement. I'm thinking of removing it and replacing with stainless and making it part of the a frame I have ideas for. On the bow I can't see anything but it was a sport boat. I have the old dash but it's pretty rotten.

Yes my transom appears to stop at deck level I guess I could double up the deck thickness around my sump to compensate as it appears to be very thin. I am also thinking of fitting an elephant trunk also but the idea for the pump was to keep the deck dry when I am using it in the canal at low speeds.

This was my general idea and not to go below the keel drain hole too mutch.
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Old 03 November 2018, 17:50   #4
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Avon sr4 of unknown vintage

I think a lot depends on what outboard you are going to put on the back, if you are going for a 40 or 50 I would be concerned that force and weight of the motor would break the join between the deck and transom. Compared to modern boats the seariders have very thin transoms, that coupled with old ply that has even with the best will in the world taken some water and it might be a recipe for breakage.

Would you drop the well all the way to keel and are you considering blocking up the hull?
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Old 03 November 2018, 18:12   #5
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Yes tbh I'm expecting that when I remove this but of metal from the top of the transom I will find out why they put it there

I currently have a 3 Chinese hp electric outboard that turns out to only be 1 real hp so no issue yet but I am looking towards something 40 to 50 hp and possibly a diesel so possibly a little on the heavy side so some sort of strengthening will be needed I guess

I was planning on keeping the flooding hull tbh it does make it very stable compared to with it blocked up. It was partly/badly blocked when I first got it the fronts had silicone and a single layer of glass over them and the back had a bit of rotten ply siliconed to it currently running it on the canal it feels a lot safer flooded but I do have very little weight atm apart from myself
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Old 04 November 2018, 03:23   #6
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Absolutely not cut it. Looks to me a very early SR4 indeed.

You may have a bit of history there but do not alter it
And turn it into something its wasnt meant to be
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Old 04 November 2018, 04:27   #7
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Why is there so much water on deck? If you are in the sea, or travelling at speed you get waves etc. But in a canal...? It shouldn't get THAT wet...

Eli Trunk is the answer to significant water.

But perhaps the lack of (proper) engine on the back is affecting the bow-stern trim...
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Old 04 November 2018, 05:01   #8
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Avon sr4 of unknown vintage

I get the opís point, the sr deck is totally flat so even a small amount of water washes about and comes forward when you back off the throttle but I donít think cutting the deck is the answer, an elephant trunk is a better solution.

I saw one over the summer that had a blocked hull with a bilge pump in the void space and enlarged deck drains. I never saw the owner so didnít find out how well it worked.
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Old 04 November 2018, 06:28   #9
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Well it was rain I was most concerned about in the canal it soon gets a couple of inches deep in the back while your in the pub! But on the other hand I thought it would be handy for fishing and other pottering about stuff where the trunks would be more likely to backfill. I know if I am at any speed and take a wave over the bow the pump osnt going to make a scrap of difference and I would need the trunks then. I guess if the transom has no rot in it I will leave it as is but if it is rotten I will have to cut out round there anyway maybe a sneaky little modification, it was an ultra rare factory option back in the 70s

On another subject has anyone seen replacement Avon searider logos like these? I'm going to replace all the tube attachments and rub strip to tidy it up a little. Also there is a hole in the keel up near the front that needs doing too nothing major though.

This picture is the current state of the transom not sure what purpose that 1mm ally plate actually has
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Old 04 November 2018, 08:06   #10
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Oooh that metal may be hiding a lot of things you don't want to imagine.

Not seen those Avon badges before. But henshaws can laser cut so if an image can be created it may be possible....

What are your reasons for a diesel OB? I like the idea, but struggle to find a persuasive arguement!!
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