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pondmonkey View Drop Down
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Posts: 2202 		Post Options Post Options   Quote pondmonkey Quote  Post ReplyReply Direct Link To This Post Topic: Dinghy Development
    Posted: 05 Feb 13 at 2:06pm
Can't we infect the world's oceans, seas, rivers and reservoirs with some sort of deranged weapons-grade chemical substance that changes it from H2O into a luminous pink electro-ectoplasm that could power modes of transport without worrying about the wind?  

Venkman: Dude... what are you fishing for?

Winston: Oh the usual... some nasty kid chucked their wing tips down here and his dad's ranting on the internet
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 13 at 2:33pm
You don't need pink ectoplasm to travel the world's oceans without wind (or an engine). It is already doable with underwater gliders and wave gliders:



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Pierre View Drop Down
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Posts: 1532 		Post Options Post Options   Quote Pierre Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 13 at 2:41pm
So, just for the hell of it, and if I had the money and time, I would just love to make a very light and strong carbon Osprey or some such "traditional" dinghy. No restriction on weight and such like, just to see what would happen performance-wise.
I happen to like boat shaped boats.



Edited by Pierre - 05 Feb 13 at 2:42pm
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pondmonkey View Drop Down
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Posts: 2202 		Post Options Post Options   Quote pondmonkey Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 13 at 2:54pm
Originally posted by Pierre

 
I happen to like boat shaped boats.


me too... and I'm kicking myself for not downloading a photo of a smooth finished NZ boat based on a Merlin I saw on Facebook a couple of weeks ago.  I think it was a Keith Callaghan jobby, but not a Hadron, well nice it was.
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 13 at 3:01pm
Ah, but Pierre, if you make it lighter you will make it float higher. This will reduce the waterline beam, and hence reduce its stability (as distinct from righting moment). The lighter hull will also mean a higher centre of gravity, again reducing stability. The lower mass will also mean less inertia. The upshot is that your beautiful seaworthy boat will suddenly not stay upright when launched, will be twitchy in every puff/lull and will get tossed around by every wave. Just like any other lightweight skiff.

I think it was Uffa Fox who said weight was only of use in a steam roller. I would respectfully disagree. It is too easy to fall in to the trap that better = faster. Better can also be cheaper, stronger, more sensitive, more responsive, less responsive etc.
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tick View Drop Down
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Posts: 223 		Post Options Post Options   Quote tick Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 13 at 3:44pm
As I thought. Just improvements, carbon Osprey? centre sheeted Laser? all just developments. No "improbability drive"* or "Cavorite"*, just James pretty plastic Dyson. As a man snowed in with a mad woman and four cats I was hoping for mind stretching diversion.......how about catching the high pressure air as it leaves the sail/wing and piping it to loads of small holes in the hull, like an inside out jacuzi, would that get rid of all that nasty friction? We will have to wait until GRF gets back for some er....original thought.

* Anyone who can give me the literary references to these gains my admiration.
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fab100 View Drop Down
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Posts: 1005 		Post Options Post Options   Quote fab100 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 13 at 4:01pm
Infinite Improbability Drive - machine required to generate a boat-design that could keep both GRF and James happy for more than 3 months

Said boat would likely need to be constructed from Cavorite, built by Messrs Round-Tuit, ropes made from unicorn hair and sails from phoenix feathers. No trolley for launching/storage - just uses a sky-hook




Edited by fab100 - 05 Feb 13 at 4:02pm
Great book for Club Sailors here
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Pierre View Drop Down
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Posts: 1532 		Post Options Post Options   Quote Pierre Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 13 at 4:03pm
Dear Peaky
Thank you so much for raining on my parade.
I disagree  Tongue
......and with 30 stone on board I think I think the centre of gravity
and inertia are going absolutely nowhere.

Dear Tick
Get a grip man.

Dear James
Thank god. I am not alone.
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fab100 View Drop Down
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Posts: 1005 		Post Options Post Options   Quote fab100 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 13 at 4:05pm
Back to the original post...

How about sails that flap like a birds-wing? - err-no, perhaps not, that would just be back to the windy-board/Finn air-rowing nonsense
Great book for Club Sailors here
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Posts: 742 		Post Options Post Options   Quote rb_stretch Quote  Post ReplyReply Direct Link To This Post Posted: 05 Feb 13 at 4:15pm
Originally posted by Pierre

So, just for the hell of it, and if I had the money and time, I would just love to make a very light and strong carbon Osprey or some such "traditional" dinghy. No restriction on weight and such like, just to see what would happen performance-wise.
I happen to like boat shaped boats.

 
I would love to see that as well. With unrestricted carbon rig and moulded sails the CoG need not be any higher and I reckon the waterline beam would only be fractionally narrower. Let's say you could knock the Osprey down to 74kg rather than 134kg. That is only 60 litres of volume you need to lose, spread out over 17ft and I reckon you'll lose a few centimetres at most.


Edited by rb_stretch - 05 Feb 13 at 4:15pm
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