Whats with the dagger board..
Printed From: Yachts and Yachting Online
Category: Dinghy classes
Forum Name: Dinghy development
Forum Discription: The latest moves in the dinghy market
URL: http://www.yachtsandyachting.com/forum/forum_posts.asp?TID=10655
Printed Date: 18 Jul 25 at 5:58am
Software Version: Web Wiz Forums 9.665y - http://www.webwizforums.com
Topic: Whats with the dagger board..
Posted By: ifoxwell
Subject: Whats with the dagger board..
Date 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  ------------- RS300 |
Replies:
Posted By: PeterG
Date 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. ------------- Peter Ex Cont 707 Ex Laser 189635 DY 59 |
Posted By: jeffers
Date Posted: 21 Jan 13 at 11:59am
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The will be a hydro generator at a guess..... ------------- Paul ---------------------- D-Zero GBR 74 |
Posted By: olly_love
Date 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 ------------- TWO FRANK-Hunter Impala |
Posted By: winging it
Date 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.....
------------- the same, but different... |
Posted By: tgruitt
Date Posted: 21 Jan 13 at 1:02pm
You beat me to it!!!  ------------- Needs to sail more... |
Posted By: ASok
Date 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. ------------- |
Posted By: Contender 541
Date 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?) ------------- When you find a big kettle of crazy it's probably best not to stir it - Pointy Haired Boss Crew on 505 8780 |
Posted By: gbr940
Date 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. ------------- RS400 GBR1321 |
Posted By: ifoxwell
Date 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 ------------- RS300 |
Posted By: getafix
Date Posted: 21 Jan 13 at 8:46pm
I'm thinking a fair few dollars will be spent on re-designs when the Vendee is over.... might be Ok cruising along <10knts, but obviously a few lessons needed to be taken into account when cruising at ~18knts is more the norm! |
Posted By: johnreekie1980
Date Posted: 22 Jan 13 at 1:02pm
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The problems on the vendee have been a mixture of poor stock design, competitors hitting things and electronic failures out with the unit. It seems a really neat solution for your average cruising boat. The higher speeds of the vendee clobe require adjustment of the pitch of the blades this is another layer of compexity the cruisers do not have to deal with. Pretty expensive though.
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Posted By: ASok
Date Posted: 22 Jan 13 at 2:01pm
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As a positive the vendee has proved to be one hell of a sea trial for the equipment. I'm sure the manufacturers will be working on improvements and it wont be long before more robust units are produced. Does seem like a really neat idea though. More reliable than solar panels and I've never been a fan of the mini wind turbine on transoms ------------- |
Posted By: getafix
Date Posted: 23 Jan 13 at 12:52pm
| They are a great idea and fit nicely into the ethos of powering your boat's electronics and systems naturally, rather than with a stinky engine ... however, I do think that the proliferation of technology inside boats, particularly in navigation systems, is taking away from old fashioned chart reading and plotting skills... not a good trend IMO. |
Posted By: fleaberto
Date Posted: 23 Jan 13 at 1:21pm
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Not all of the Vendee boats H/G's have failed - don't forget Javier Sanso is still there and 100% fossil fuel free...not a drop of fuel was put onboard and Dominique Wavre has no complaints, having only used 10litres of diesel since the start: http://www.vendeeglobe.org/en/news/newswire/10707/dominique-wavre-s-energy-system.html - http://www.vendeeglobe.org/en/news/newswire/10707/dominique-wavre-s-energy-system.html
------------- Lightning368 'All the Gear' (409), Lightning368 'Sprite' (101), Laser (big number) 'Yellow Jack', RS Vareo (432)'The Golden Rays' |