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Whats with the dagger board.. |
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ifoxwell 
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Joined: 05 Jan 06 Location: Hoo Online Status: Offline Posts: 669 |
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 Topic: Whats with the dagger board..Posted: 21 Jan 13 at 11:28am |
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...hanging off the back of this keel boat.
And whats the small prop sitting on top of it all about? Ian  |
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RS300
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PeterG
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Joined: 12 Jan 08 Location: United Kingdom Online Status: Offline Posts: 822 |
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Posted: 21 Jan 13 at 11:34am |
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Is it some sort of water flow generator? Flip it down (I'd think it folds down dinghy rudder style rather than dagger board style) and the prop is then linked to a dynamo?
Alternatively it acts as a log when it's down, but I can't see the need, or the advantage of doing it that way.
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Peter
Ex Cont 707 Ex Laser 189635 DY 59 |
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jeffers
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Joined: 29 Mar 04 Location: United Kingdom Online Status: Offline Posts: 3048 |
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Posted: 21 Jan 13 at 11:59am |
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The will be a hydro generator at a guess.....
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Paul
---------------------- D-Zero GBR 74 |
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olly_love
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Joined: 18 Jan 05 Location: United Kingdom Online Status: Offline Posts: 1145 |
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Posted: 21 Jan 13 at 11:59am |
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its a hydrogenerator, we fit them to our boats as an option, they can generate alot of power at sailing speeds with very little drag, and they flip up for when the winds light or you knock somthing
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TWO FRANK-Hunter Impala
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winging it
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Joined: 22 Mar 07 Online Status: Offline Posts: 3958 |
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Posted: 21 Jan 13 at 12:56pm |
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it's the latest 420 option, they're trialling it for the CA ahead of the steve nicks.....
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the same, but different...
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tgruitt
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Joined: 02 Dec 04 Online Status: Offline Posts: 2479 |
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Posted: 21 Jan 13 at 1:02pm |
You beat me to it!!!  |
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Needs to sail more...
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ASok
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Joined: 26 Sep 07 Location: United Kingdom Online Status: Offline Posts: 739 |
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Posted: 21 Jan 13 at 1:04pm |
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Definitely a hydrogenerator
Have you not followed any of the Vendee Globe? They have been a major source of pain to Alex Thomson on Hugo Boss. A couple of others have had issues with them.
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Contender 541
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Joined: 05 Dec 05 Location: Burton on Trent Online Status: Offline Posts: 1402 |
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Posted: 21 Jan 13 at 1:22pm |
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Yeah - Hydrogen
Brilliant idea - you make power for free with little to no (read so small not worth calculation in real world applications) drag penalty Small problem when they are your primary source of power and you break them - see Vendee (Is it 5 of them now?)
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When you find a big kettle of crazy it's probably best not to stir it - Pointy Haired Boss
Crew on 505 8780 |
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gbr940
Posting king 
Joined: 04 Jan 06 Location: United Kingdom Online Status: Offline Posts: 198 |
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Posted: 21 Jan 13 at 1:57pm |
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That one in particular is a Watt&Sea Cruising Hydrogenerator - most the Vendee boys are running the Racing version which has variable pitch props to reduce drag.
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RS400 GBR1321
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ifoxwell
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Joined: 05 Jan 06 Location: Hoo Online Status: Offline Posts: 669 |
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Posted: 21 Jan 13 at 2:56pm |
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Ok guess that makes sense.
Seems like a lot of engineering to just hang a prop off the back but I can see the thinking Ian
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RS300
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