Edition
Old club classes |
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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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 Topic: Old club classesPosted: 20 Apr 22 at 7:01pm |
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How is the mizzen controlled ?
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Robert
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davidyacht
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Joined: 29 Mar 05 Online Status: Offline Posts: 1345 |
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Posted: 20 Apr 22 at 7:46pm |
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Double ended sheet, led to side deck by helm. I have a kicker strop. The Mizzen affects balance on the helm quite a lot. It is a mute point whether a Yawl is faster with or without the Mizzen, but you are not allowed to race without one, and must finish with it up. In truth a Salcombe Yawl is a ketch, since the Mizzen is forward of the rudder!
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Happily living in the past
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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: 20 Apr 22 at 9:05pm |
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Trying to get my head round what it does to centre of effort, presumably there isn't one as such?
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Robert
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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: 20 Apr 22 at 9:46pm |
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There is always a centre of effort
 just as there is always a centre of lateral resistance. Adding a jib will move it forward, adding a mizzen will move it aft but it's always there. |
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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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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: 20 Apr 22 at 9:54pm |
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Missing something
OK, why did the designer think he needed a mizzen?
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Robert
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423zero
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Posted: 21 Apr 22 at 6:02am |
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Went on a cruising forum and had a read, useful sail.
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Robert
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davidyacht
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Posted: 21 Apr 22 at 6:33am |
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I believe that it originates from fishing boat origins, whilst the early Salcombe Yawls were never intended as fishing boats, this was a configuration back in the day, as a balancing sail. And yes the Mizzen moves the centre of effort back, on a reach it is vital to get the trim right or it weights up the helm. It is also slow to over trim the mainsail upwind otherwise the dirty air off the main shunts straight into the Mizzen. There is a minimum size for the Mizzen and the Howlett boats have gone down this route to reduce drag.
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Happily living in the past
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Gordon 1430
Far too distracted from work 
Joined: 27 Jun 17 Location: Lee on Solent Online Status: Offline Posts: 310 |
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Posted: 21 Apr 22 at 8:17am |
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Hi Davidyacht
Are the fleet at Rock similar? |
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Gordon
Phantom 1430 |
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davidyacht
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Posted: 21 Apr 22 at 8:40am |
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Don't they sail Shrimpers? Big fleet at Poole too
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Happily living in the past
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Mozzy
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Joined: 21 Apr 20 Online Status: Offline Posts: 209 |
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Posted: 21 Apr 22 at 10:15am |
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There is a mizzen on the in laws day boat. It completely gets rid of lee helm upwind. Of course, it's a bit of an air break, like sailing with lee helm is a water break. So I doubt it's any faster with it up, but it does make the boat nicer to sail.
It does raise the question of why you wouldn't just have the sail plan balanced without it. But it does allow you to keep more sail area forward and an open back deck area (good for fishing I suppose). It can also help with manoeuvrability as you can change the CoE quick dramatically by sheeting it on or off. Also keeps you head to wind when hoisting or dropping the mainsail. Edited by Mozzy - 21 Apr 22 at 10:20am |
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