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Paul H (admin) |
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She looks great Rob. Well done for all that hard work.
The Paradox-style roller blind sail should work well. -Paul |
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In reply to this post by Rob Blackburn
I understand that it takes a day to get a boat half built (all the planks or moulds cut and assembled for instance.) Then a day to do half of the half that remains. Then another day to do half of the remainder, a day to do half the remainder again and so on.
Someone will tell me what the name is of the scientific principle that theory is based on. Clearly, following that theory the boat is never actually finished! But she's looking good. Will enjoy seeing pictures of her afloat and reading of the journey's you make together. Tim.
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Port-Na-Storm |
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Timmo,
You have brought back not altogether welcome memories of my old maths teacher, "Beaky" Spence who was so old she'd actually taught my mother. She tried to introduce Differential Calculus with a tale of a frog jumping across a road in a similar way, each time it jumped half the previous distance. I couldn't understand why the stupid thing didn't just get off the bloody road. Maybe if Beaky had described it as a boat build I'd have got it. But probably not. Huge congratulations to Rob; Building Katie was a massive leap half way across the road and I'm glad he's got to the other side. The world waits in anticipation for the sea trails. Grum. |
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Chris Waite |
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Isn't it
"The Law of Diminishing Concerns" That is you've put off all the fiddly little bits as you really, really don't want to be bothered with them and once your dream-boat just about works, your mind is already on a slightly (or very) different version. Anyway, she's on the water and you can get her about by hook and by crook so off you go; well I know that I do anyway. A long time ago I was lucky enough to acquire a 'sail-away' gaffer courtesy of the Bank of Father Waite; ready to sail, but empty below. Ha!, I thought, a couple of weeks and I'll have this sorted out. How naive can you get? It wasn't until I was about to step aboard for the adventure of a lifetime, ten years later that the interior eventually turned white, having been a somewhat bilious pale glass-fibre green for the previous decade. Even then, in the steps of Donald Crowhurst, there was a pile of raw materials, alright ply off-cuts and the like in the forepeak, to complete. Then more recently, those of you on the Thames Raid (?2013), or at Beale will perhaps remember Polly Wee, rig-less and interiorly unpainted. I spent a large part of the first night at Lechlade tying in my hammock-berth, by torchlight, under a cammo polytarp, in the pitch black and pissing rain, courtesy of some green light line kindly donated by Graham, as I had forgotten to put my usual bag of bits on board. And talking of that gentleman, he is still sailing the annual raids, from that time on, under mizzen. And a good job it is doing for him, though I do seem to remember that Katie Beardie, was meant to be a sailing canoe with a rig that included a mainsail. I see his point - "Why bother?" And so it goes CW |
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Paul H (admin) |
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It's an "integer sequence".
One nice example is Fibonacci Numbers: https://en.wikipedia.org/wiki/Fibonacci_number See how the spiral gets smaller and smaller on each step...It never finishes until infinity. Paul Sent from my Samsung device |
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Rob Blackburn |
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In reply to this post by Chris Waite
Well I was worrying about that whole problem of the next boat. That whole middle of the night thing.
So here is my solution. https://goo.gl/photos/t7V5Au7ZUXSKxkmM8 |
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In reply to this post by Paul H (admin)
Errrrrm, no, it's not; in your example Paul the spiral is really getting bigger not smaller, in integer steps ('cos the next number is the sum of previous two integers). If you want to look at it from the other way as a decreasing spiral it _does_ have an end - the spiral is complete with the last 1 (or zero, depending how you want to look at it, but a square of side length 0 is a concept only a mathematician would worry about........)
My maths teacher would call Tim's example a geometric progression, where today's progress is ((today - 1)'s progress)/2 and work completed is sum between start & today of (today's progress). Does Nabble do Greek letters?! This never ends, i.e. with the common ratio of 1/2, 1/2+1/4+1/8+1/16+....... never reaches 1. A line representing progress against time would be asymptotic to a horizontal line representing the finished boat. You just have to hope you've reached 'watertight' before you hit 'launch' on the time axis. Engineers will assume the frog's dead & paddle to the pub. Off to cut some firewood. Random lengths. Phil. |
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Port-Na-Storm |
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I'm with the engineers on this one. It's similar to the principle that whatever course you set from Cobnor the result ends up being the pub at Dell Quay. Soon. Grum. From: [hidden email] Sent: 16/08/2016 15:32 To: [hidden email] Subject: Re: Katie Beardie as done in Australia... My maths teacher would call Tim's example a geometric progression, where today's progress is ((today - 1)'s progress)/2 and work completed is sum between start & today of (today's progress). Does Nabble do Greek letters?! This never ends, i.e. with the common ratio of 1/2, 1/2+1/4+1/8+1/16+....... never reaches 1. A line representing progress against time would be asymptotic to a horizontal line representing the finished boat. You just have to hope you've reached 'watertight' before you hit 'launch' on the time axis. Engineers will assume the frog's dead & paddle to the pub. Off to cut some firewood. Random lengths. Phil. If you reply to this email, your message will be added to the discussion below:
http://uk-hbbr-forum.967333.n3.nabble.com/Katie-Beardie-as-done-in-Australia-tp4028760p4029608.html
To start a new topic under Builds in Progress, email [hidden email]
To unsubscribe from UK HBBR Forum, click here. NAML |
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Rob Blackburn |
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End of the road.
https://goo.gl/photos/txLuU8yLtZBRDbABA Awinya was launched today and I must admit to mixed emotions. I was fearful she would not sail, would be by the bow and have lee helm. No problem. Perfect balance and you can steer her by rolling her one way or the other with the rudder neutral. So that was a relief. Light winds, sheltered bay and my sailor daughter Cate, to help me launch. So conditions were perfect. Rig Light winds but the overarching feeling is it should have been bigger. We will see how it goes with 15 knots Roller reefing worked perfectly. Helm is perfectly balanced Interesting that the narrow hull does not respond like a catamaran… (he jokes) Gust hits and the boat heels, without much increase in speed, shift your weight, boat powers up etc… One needs to have served a Laser Dinghy apprenticeship to handle this in bigger winds I think. Put some tell tales on and made it easier. Rudder Seems as if the rudder cheeks etc I built is too big/low in the water and as soon as you get a bit of pace on the noise/turbulence starts behind you. First world problem I know. Not sure if it is worth the effort to alter. Pedals are noisy. Very noisy. Will try silicon spray. Needs a rudder stick thing to steer by hand too. Paddling Seemed much easier to use half the kayak paddle ie one blade on one side. I have a longer Hobie paddle which does not split in the middle to try next. Seat needs to be higher to enable full paddle I think. Will modify maybe to allow the seat to be lifted up against a stop, ¼ inch rod with plastic tube over? Felt heavy to start with but as day went on it became a sail:paddle ratio in my mind of 80:20. Less paddling the better really, it is really a canoe to sail and then paddle only as you must. Centreboard Works really well Could be a bit big but... Seems to give good stability by reducing rolling, Points really well when you get it going, ie start off about 15deg off the close hauled position and then as you get some lift on the board, steer up and away it goes. Up and down mechanism all good. Tracking Perfect. Slow to tack if wind is v light Long and narrow would suggest that this is to be expected. Also fairly big skeg installed by the builder would be part of this issue. Canting Seat Really good as you do get sick of sitting on a lean. Think I should trim the edges a bit and glue some white melamine on inside of canoe to make it move easier up and down. Downside is that it looks as if a demented spider has been at work with all the ropes in the cockpit. Overall. It does exactly what I thought/hoped. I had a great few hours sailing around in skinny water totally absorbed by the boat and the day. Simple to launch, simple to rig and just fun to sail. If I had my time over starting today, I would have to look at the CLC kit that has just come out with the Hobie Mirage drive. Looks good and I think that with the roller reefed main would be pretty well perfect. But I am going to leave that to someone else. See you all later with some photos from Fraser Island. Rob |
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Port-Na-Storm |
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Hi Rob,
Brilliant! Congratulations, I'm probably as excited as you to see her on the water. I often paddle on one side, probably through laziness as much as anything, switching to both sides when I need to put some power down. Seeing your roller reefing has inspired me to get on and make one for Katie, which I've started. What is the area of your sail? I hope you enjoy Awinya, I look forward to hearing about your adventures. cheers Graham |
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