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A new class of dinghy? |
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Daniel Holman 
Really should get out more 
Joined: 17 Nov 08 Online Status: Offline Posts: 997 |
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 Topic: A new class of dinghy?Posted: 29 Sep 18 at 3:49pm |
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Correct. It’s a variable in that dynamic system in a similar manner to the tyre pressure, tyre stiffness, and spring stiffness in a cars suspension. Both affect the dynamics of the overall system.
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turnturtle
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Joined: 05 Dec 14 Online Status: Offline Posts: 2538 |
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Posted: 29 Sep 18 at 6:43pm |
Correct |
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KazRob
Far too distracted from work 
Joined: 22 Oct 16 Location: Scotland Online Status: Offline Posts: 245 |
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Posted: 29 Sep 18 at 7:23pm |
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Lots of people tried to build 'stiff' Finns but they were all dog slow. Someone described sailing them as like driving a Landrover with no suspension and perhaps the rig was just too brutal early on and a bit of flex in the hull eased the task with a bit of extra response. What was needed before Devoti worked out how to make them 'just right' was an good old boat with soft decks and flexy hull up front but fairly stiff from the board backwards. Seems strange to those brought up on 'stiff is fast' but they worked this stuff out in the 60s
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OK 2249
D-1 138 |
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Sam.Spoons
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Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3401 |
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Posted: 29 Sep 18 at 8:08pm |
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I suspect it wouldn't work on a skiffy hull, the Finn only just qualifies as a planing dinghy
 but I'm prepared to be wrong, If I am then maybe rotomould is the way to go?
Edited by Sam.Spoons - 29 Sep 18 at 8:08pm |
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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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Daniel Holman
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Joined: 17 Nov 08 Online Status: Offline Posts: 997 |
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Posted: 29 Sep 18 at 8:17pm |
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Any unstayed cat rig boat would benefit from managed torsional rigidity.
Rotor mould is excellent in many ways, cost and robustness to name but two but will always result in a fairly heavy panel weight, and can’t be locally reinforced like frp so needs careful reconciliation of loaded points. |
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Posted: 29 Sep 18 at 9:10pm |
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Is it possible to use short (or long) fibre reinforcement in the moulding process to improve the mechanical properties?
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Daniel Holman
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Posted: 29 Sep 18 at 9:20pm |
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I havent heard of it rotormoulding, but I'm not an expert. There is a fair bit of that in other moulding processes - glass filled nylon is reasoanbly common in moulded plastic parts like gudgeons. Its quite strong.
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Posted: 29 Sep 18 at 9:35pm |
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Cheers Dan. Not something I know much about so maybe it isn’t possible - could be onto a winner if you can figure it out though!
Edited by Peaky - 29 Sep 18 at 9:35pm |
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Daniel Holman
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Joined: 17 Nov 08 Online Status: Offline Posts: 997 |
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Posted: 29 Sep 18 at 9:47pm |
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No sweat - it would be someone far more expert at plastic than me that would know whether or not it were possible and why. Hmm
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423zero
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Joined: 08 Jan 15 Location: United Kingdom Online Status: Offline Posts: 3420 |
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Posted: 30 Sep 18 at 8:28pm |
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Anyone tried aluminium pressings ?
Would be stiff and light, not sure about landing impacts though ?
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