Sea Otter is the only company I know if who make aluminium narrowboats. Most of the boats you will see for sale second hand are “trail” boats which means that they are designed to be small and light enough to be taken out of one waterway and then transported to another waterway by the owner. They are generally very much more expensive then steel hulled narrowboats of the same length and I believe, because they are aluminium, they are very difficult to modify.
I have also heard that they aren’t as robust as steel hulled narrowboats but I haven’t read any evidence to support this. On the contrary, I found this post raving about the indestructibility of a Sea Otter. (Please note that the boat referred to in this post is a trail boat).
Sea Otters, because they are aluminium, are much lighter than steel hulled narrowboats which means that you struggle to cruise in winds which wouldn’t be too much of a problem for a steel hulled narrowboat.
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Paul answered most of the points.
Aluminum is also more expensive than steel. It is much more difficult to weld than steel and there are, accordingly, many less qualified welders who have a ticket for it.
“Never give up, never leave anyone behind!”
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I’m posting the following on behalf of Sea Otter owner Brian Colling. He appears to be having a problem adding content to the forum. I’ll get him there but, in the meantime, here’s what he wants to add to the thread…
Regarding being blown about in the wind, in my experience, there is little difference…..both are blown off course when the wind blows hard, and both are hard to manoeuvre in the wind. The Sea Otter may be lighter (but that rather depends on how much gear you carry with you, and I carry a lot!) but it also has a v-shaped hull, full of water ballast, which aids manoeuvrability and stability.
Incidentally, the v-shaped hull helps enormously when mooring on the banks of shallow canals, such as the Lancaster, which I am presently on.
But the main reason I decided to opt for a more expensive aluminium boat…….I hate rust !
My Sea Otter is now approaching 3 years old. My Nannni engine’s guarantee will soon be running out, but the boat looks as good, if not better, than the day it was launched at Crick. If I was the owner of a more normal steel boat, I would now be considering having the hull re-blacked, and all the inconvenience that entails. Instead I imaginarily bung a few hundred quid back into my coffers, towards the initial higher cost of the boat. Whether or not I fully recoup it may well depend how long I live, but if I need to sell the boat, a totally rust-free boat MUST attract more interest, and for sure the resale value of a Sea Otter is anyway much higher. I see brand new boats, from the cheapest to the VERY dearest manufacturers, with brown stains gradually building up from steel hinges, steel frames, steel hatches, steel hand-rails, and ……pretend rivets ! On a Sea Otter, ALL the metal (except for the stainless steel water tank) is aluminium, and I see absolutely no evidence of corrosion of any description. Even the engine bay is as bright as the day it was built, without any need to paint it.
Paul mentions a factor I had never considered, that of an aluminium boat being more difficult to modify at a later time. I don’t know much about that, but I have attached a photograph showing bulkheads in place during the building of my boat, so you can perhaps judge for yourself.
I also include a photograph of the finished product at Stratford.
I need also to tell you that the guys at Sea Otter are the nicest you’ll meet anywhere. Right from the directors down to the sparks and carpenters. They all work together to build a boat exactly how YOU want it !”
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