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aluminium boats
Are there any disadvantages to an aluminium hulled boat?
Seaotters (I think the only people making aluminium narrowboats in England) claim lightness, efficiency, reduced maintenance etc. But I wonder what the disadvantages are. Would they stand up to a bump from a steel narrowboat for example? Or running aground on rocks? Is an aluminium hull really almost maintenance free?
e.g., isn't there a serious problem with electrolysis?
I have a 30' Sea Otter (8 years old) - bodywork never been re-painted, don't even bother to touch-up the scratches! And a narrow boat which doesn't have scratches has never been anywhere!!
They are made from a marine-grade aluminium alloy, the same sort of material used for harbour work boats, oil rig support vessels, the Swedish Navy, the Thames water police, some cross-channel ferries and life-boats.
As regards "a bump" from a steel narrowboat, a few years ago when returning to the Midlands from the National Festival at Beale Park, and just outside of Braunston, we were hit so hard by an out-of-control hire boat (being "driven" by a kid whose head barely came above the cabin) that we were pushed through the hawthorn bushes and up onto the bank!
The only damage to our boat was about a yard of the rubber fender was lifted.
We returned to our mooring - contacted Sea Otter who said to leave it with them. Next week when we went to the Marina, she was sitting back in the water looking as though butter wouldn't melt in her mouth! Sea Otter had collected her, trailed her back to Chesterfield, replaced the fender and returned her within that week.
Have you looked at the Sea Otter web site for more info.
Of course, the big disadvantage of owning a Sea Otter is that you feel compelled to join the Sea Otter Owners' Club (Countrywide membership) who run their own "Rescue Service" for members (if you are in my area - just phone if you need a new fan belt, address of a dentist, Vet or just a good pub) and to join groups at National Festivals or small group cruises (you can get 4 x 31' Sea Otters in the locks on the Caen Hill flight - that's a lot of wheelers!)
How can you get from the Trent & Mersey to Bristol to Walton on Thames and back in ten days?
Easy - Sea Otter trail you to Bristol Marina where you join a happy gang, you cruise to Walton, along the Avon, Kennet & Avon and the Thames, then phone Sea Otter to say "come and get us"
No probs with electrolysis. Husband is a graduate metallurgist and wouldn't have anything but a Sea Otter.
A report from Sheffield University Metallurgical lab gave a report of "a life's expectancy in excess of 100 years". I reckon that will see us out!!
Disadvantages: They are lighter so a strong gust could be more of a problem than with a similar-sized steel boat; but have you ever tried to push off a steel boat which is wedged firmly against a bank? You can do it single handed with a pole when you have a captive Sea Otter.
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What metal might you fasten to the hull of an aluminium boat to give it cathodic protection in sea water?
Name two metals that you would not use. Explain your choices.
You need to use metals that are higher (than the metal to be protected) on the electrochemical series. Problem is aluminium is near the top & metals above it are very reactive.
The series is K, Na, Ca, Mg, Al, Mn, Zn, Fe, Ni, Sn, Cu, Hg, Ag , Au for some comon metals. So Zinc is used to protect copper propellers and fittings since it is higher on the series. In your example Magnesium, theoretically could be an option as other higher metals will react readily with water. In practice aluminium is protected by a thin film of alum. oxide which forms spontaneously in air , also aluminium boats may be painted.
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