IanD

I meant the amount of effort needed to move the tiller against the force of the prop wash, which I thought was called "weight" just like for steering on a car?

That path (from moorings next to bridge 208) is "interesting" in the dark when it's been raining... (good food and beer at the end of it though)

So a restaurant not a pub, then? 😉

In which case it should indeed be better for manoeuvring, but might be heavier to steer because the balance is the same size (small!) as the flat plate one, it should be a bit bigger to keep the same tiller weight. IIRC the extra lift from the aerofoil (hydrofoil?) shape moves the centre of pressure backwards compared to a flat plate -- not as much for a thin section like yours as a thicker one like mine, but probably still noticeable.

Not suggesting you had a problem, but there's no harm in making things better still... 😉 (a lot of the boats I've been on certainly couldn't turn like that, but some were better than others...)

Having started at Shakespeare's at 11am (they opened specially...) we went on afterwards to dance at the Sheffield Tap before getting the train back -- great weekend, large quantities of delicious beer at Sheffield prices consumed, much fun was had by all. You should have come over and said hello... 🙂 Boat is coming along as planned, last hitch was the question of whether the planned bike locker (which tapers in both directions) would be deep enough, so I had to borrow a friend's Brompton and drive up to Stoke (and back) yesterday to check. 300 mile round trip but couldn't find any alternative -- still, better than finding out it won't fit *after* the boat is built... 😉

It's getting to be a real pain mooring at Castlefield. Last time we were there the "tuning fork" moorings were blocked off for work, and there were almost no spaces on the other (almost non-existent) visitor moorings. It's almost as if they don't *want* any visiting boats... 😞

There are usually spaces on the VMs (48h?) in the "tuning fork" arms north of the main basin under the railway bridge.

We were the cheerful ones (without green trousers and with beer), you obviously didn't spot us... 😉 (the Flower Market had asked for some dancing and booked a couple of spots...)

You can get marine ones made from either copper (cheaper, easier to work with) or stainless steel (more expensive, harder to work with). Unlike domestic ones they're designed to be pump pressurised and are tested to quite high pressure (5 bar?), so are made from thicker material than domestic ones, which is why they cost more. If the boat system is badly designed (no accumulator, lots of cycles from high to low pressure -- or even worse, a cylinder not designed to take the pressure) then they can still fail from fatigue, regardless of material.

It will be better than a flat plate rudder, but it's a pretty thin section (looks like NACA005?) so really optimised for low drag at higher speeds not low-speed manoeuvrability. The pivot point also looks rather close to the front (small balance area), a profiled rudder like this needs more balance than a flat plate because the extra lift moves the centre of pressure backwards. To really help with low-speed turning (trawlers, tugs, narrowboats) you need a much thicker profile, typically around 20% (maximum thickness divided by chord) -- this is the (partly-finished) Schilling rudder being built for my boat, 100mm thick with 500mm chord and 25% balance...

Surecal are widely available and well regarded, also expensive (distributor markup) and only come in standard configurations, which is not helpful if where all the connections are doesn't allow an easy direct replacement for your existing one. Two companies who are also well regarded, cheaper (direct from manufacturer), and IIRC will make a cylinder to your exact requirements if a standard one doesn't suit: https://www.coppercylinder.co.uk/marine-calorifiers-boat-cylinders.html https://shop.newarkcylinders.co.uk/marine-calorifiers

I suspect she means "rusticles", which are what the Titanic was covered in... https://en.wikipedia.org/wiki/Rusticle

As in so many other "non-traditional" subjects (such as EVs and electric/hybrid boats), it's not always easy to take the "sticks and stones" approach when posts are based on misinformation, ignorance, entrenched attitudes, are just plain factually wrong, or are saying "this wouldn't suit me so it must be wrong" -- and it would certainly be difficult to do on a thread I'd started about my boat... 😉

You're probably correct. Still doubtful about posting a build diary and getting inundated by "that's modern not trad, <xxx> is much better" comments, especially from people who seem to think that doing things the old way is *always* good and the new way is *always* bad -- if I thought that, I wouldn't be building a hybrid boat... 😉 If people want to live on boats and stick with 50 year old technology for power and electrics (or 100 year old hull designs...) then that's their business -- I might not want to do the same, but I wouldn't say they're *wrong* do do it this way. But many of them seem to think that anyone else who wants to do something different *is* wrong, because it's not what *they* want...

We're not arguing about the Doom Bar plague (or worse still, Greene King IPA) or Landlord, which is why I said "up North" -- many pubs don't know how to keep (or serve) it properly, but there are some non-tied-TT ones who do, and some of them are even down here in Lunnon 😉 Like a lot of other pubs, Wetherspoon have a tendency to select stronger beers especially from smaller breweries, because they keep better especially with slow turnover. They often don't have or sell out of the kind of weaker hoppier beers I prefer which is one reason (among many) that I don't like 'spoons, but that's just my preference. And before someone says "he doesn't know what he's talking about", see my avatar -- I spend plenty of time in pubs all over the country, in fact we're just about to get the train up to Sheffield for a weekend of dancing/playing/carousing which I know will involve a lot of delicious beers in many pubs there... 😉 (Shakespeare's, Kelham Island...)

The "eco hull" was obviously inappropriate for canals, the bow structure in particular works for high-speed ships in deep water but not low-speed ones in shallow water. Rudders only see the water immediately around them and what the prop pushes over them; what works in deep water (if done for low-speed vessels like trawlers and tugs, like the rudder design I posted) will work just as well in canals. It's important to recognise when situations are different and when they're similar, because this makes the difference between something working and not... 😉

I should also point out that the kind of "your boat is rubbish, mine's much better" reaction of some posters on this thread -- and the "why are you trying to make us do what you want" sniping on this and many others, especially anything that isn't "traditional" -- is another reason not to post build pictures and information... 😞 I wouldn't want some of the boats that have been posted as paragons of design and happen to think that the TT design is more elegant and "fit for purpose" than most, but that's my opinion, and I don't want to spend lots of time defending it against people who think that "traditional is always best" and "modern design and technology is rubbish". Modern technology is what lets people post on and read CWDF -- and incidentally it's almost certain that every word you read on it has got there via a chip I designed... 😉

None of which is relevant to electric boats (which use LFP batteries), the subject of this thread... 😉

And I've has the opposite experience in London; their beer choices are often bland and not to my taste, and the service is definitely slower and worse than other *good* pubs I go into -- maybe similar to other crap ones, but then I avoid these... YMMV 😉

True, but there's a difference between copying a look and copying how things are built having put a lot of time and effort into working out how to do this properly... For example anyone can throw together an electric drive system, but developing one that works really well including customised components takes a lot of time and effort and money and trial and error, and copying the end result instead of putting in the effort yourself is -- in my view -- distinctly dodgy, it's what the Chinese get accused of all the time. But then I've been involved in developing new technology for many years including all the issues to do with patents and trade secrets and intellectual property, unlike some people who just seem to think copying is OK... 😉