| Rossiter Pintail Mortagne sur Gironde, near Bordeaux |
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| Laser 28 - Excellent example of this great design Hamble le rice |
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List classes of boat for sale |
Favourite Photos |
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Lucy Lee 
Far too distracted from work 
Joined: 17 Mar 04 Location: United Kingdom Online Status: Offline Posts: 276 |
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 Topic: Favourite PhotosPosted: 15 Jan 05 at 12:38am |
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Ah, I can see you've never sailed a Cherub Just kidding, I was completely wrong. It isn't cavitation but aeration. I rather like the fact they have a nice short foil at the surface piercing point and still keep pleanty of surface area under the water to make sure they can steer at Mach 10 (approx.) |
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Fly Cherub!
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Barty
Far too distracted from work
Joined: 16 Mar 04 Location: Scotland Online Status: Offline Posts: 240 |
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Posted: 16 Jan 05 at 9:22pm |
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The short chord limits the effects of ventilation. When a wing or foil is working there is a low pressure and a high pressure side. Now the low pressure like nothing better than to mix it up with the high pressure side. Ventilation is when you have a foil operating at a medium (air, wter etc) interface, i.e. in the water right by the surface. The low pressure flows up the foil to meet the air and equalise itself. When this happens you lose lift and you create drag. Viewed from the rear (!), the rudder will have unequal water levels on each side. This is the ventilation. The shorter the chord the less lift and hence less ventilation there can be and therefore the less drag. If you don't put fences at the top of your rudder then you will just have to accept ventilation. Rudders would work much better with longer chords lower down but the engineering (too much stress at the stock) stops this. Btw the pressure differentials created across foils can mean that water boils and hence cavitates. Edited by Barty |
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sailor.jon
Far too distracted from work
Joined: 02 Nov 04 Location: United Kingdom Online Status: Offline Posts: 361 |
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Posted: 16 Jan 05 at 10:14pm |
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right its coming up to that dreaded time again, monday morning, so does anyone have a photo for the week about to start?
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Tornado_ALIVE
Really should get out more 
Joined: 07 Nov 04 Location: Australia Online Status: Offline Posts: 611 |
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Posted: 17 Jan 05 at 6:44am |
Here ya go Mate... |
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Chris 249
Really should get out more
Joined: 10 May 04 Online Status: Offline Posts: 2041 |
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Posted: 17 Jan 05 at 8:26am |
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Hmmmm, Mistral sailor in the background sheeting in and loving it, some
guys on a Tornado with the forward hand standing there brave and tall
and the skipper skulking down to leeward, too scared to get on the
wire. If you look closely, you can see his white knuckles and terrified
brow from here, and yet he sails that old people's home known as a
Tornado rather than a fast lively cat like a Taipan 4.9.......what's
wid dat guy????
 
As my forward hand/skipper says, a Tornado worlds is the sort of
regatta you do the season after you start sailing, before you get onto
macho boats like Lasers and windsurfers....I bet he didn't even sail this Sunday......WE would have sailed this Sunday, of course, if only we hadn't agreed to let some Vicwegians use the boat. We woz raring to go.  Edited by Chris 249 |
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ed490
Newbie 
Joined: 17 Jan 05 Location: United Kingdom Online Status: Offline Posts: 34 |
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Posted: 17 Jan 05 at 11:43am |
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How about this?! |
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Doctor Clifford
Far too distracted from work
Joined: 16 Mar 04 Location: Scotland Online Status: Offline Posts: 243 |
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Posted: 17 Jan 05 at 11:48am |
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That water loks like bileous vomit
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regards
Dr. Clifford take two tablets twice daily |
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sailor.jon
Far too distracted from work
Joined: 02 Nov 04 Location: United Kingdom Online Status: Offline Posts: 361 |
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Posted: 17 Jan 05 at 5:19pm |
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hey cheers guys that managed to get me thru the day,
both pics look great, the water on the second one looks like yeadon tarn. tho it cand't be cos the tarn is so shallow :'( not deep enough 4 me to put down the daggerboard on the laser 2 |
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Phil eltringham
Really should get out more
Joined: 16 Mar 04 Location: England/Hitchin Online Status: Offline Posts: 1105 |
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Posted: 17 Jan 05 at 5:41pm |
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Is it a 'spot the helm' competition?
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FLAT IS FAST!
Shifts Happen |
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sailor.jon
Far too distracted from work
Joined: 02 Nov 04 Location: United Kingdom Online Status: Offline Posts: 361 |
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Posted: 17 Jan 05 at 8:01pm |
 u reckon this could be real?? i'm not to sure, |
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