| Re: v deep or rounded plaining???
[Re: Mark P]
#127135 12/28/07 09:26 PM 12/28/07 09:26 PM |
Joined: Jun 2001 Posts: 12,310 South Carolina Jake
Carpal Tunnel
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Carpal Tunnel
Joined: Jun 2001
Posts: 12,310 South Carolina | oh they plane. Ever had the kite up in 20?
Jake Kohl | | | Re: v deep or rounded plaining???
[Re: jollyrodgers]
#127140 12/29/07 05:26 AM 12/29/07 05:26 AM |
Joined: Jun 2001 Posts: 9,582 North-West Europe Wouter
Carpal Tunnel
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Carpal Tunnel
Joined: Jun 2001
Posts: 9,582 North-West Europe | I'm mostly with Jolly on this one.
The speed difference between a well designed Deep V-ed hull and a rounded keel hull is surprisingly small. No I wouldn't design a deep V-ed hull for racing in the F18 class, because it will be at a disadvantage on the start and upwind leg but that still doesn't say the disadvantage is very large.
Wouter
Last edited by Wouter; 12/29/07 05:32 AM.
Wouter Hijink Formula 16 NED 243 (one-off; homebuild) The Netherlands
| | | Re: v deep or rounded plaining???
[Re: warbird]
#127141 12/29/07 07:54 AM 12/29/07 07:54 AM | Anonymous
Unregistered
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Unregistered | Thought you had the TS back on the market. Was I wrong or did you change your mind? | | | Re: v deep or rounded plaining???
[Re: Jake]
#127145 12/30/07 03:10 AM 12/30/07 03:10 AM |
Joined: Jun 2001 Posts: 1,459 Annapolis,MD Keith
veteran
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veteran
Joined: Jun 2001
Posts: 1,459 Annapolis,MD | Out of the boats I've owned/sailed, the only one that I would say that I have experienced true planing on is the N-20. In the rough, with wind, the boat picks up and gets quiet, and keeps hauling more butt. It feels great - get set, flick it upwind a tad to heat it and drive down fast and smooth. The first time we had the boat out in a lot of wind we shot down the Bay under main only, and with every gust it pick up, get quiet, and take off.
The N-20 hull section is fat and flat aft, and the hulls are canted. The bows, although flared pretty dramatically at the deck, are pretty standard stuff at and below the waterline. The bouyancy in the bows is a wonderful thing, but maybe not so good going out through surf. Other than that I wouldn't trade them.
My 6.0 never felt like it was planing, although it is plenty fast. Rounded hulls, decent bouyancy, not as fat as the N-20 hulls. These hulls cut through just about anything, just power through it. But again, never had the planing sensation like on the N-20. Same goes with the H-20, and H-18.
So, I'm fairly convinced that most of the rounded hulls at best semi-plane (like semi-displacement, semi-planing power boats). As for the v-hulls planing when heeled - that depends on the boat. Most v hulled boats are asymmetrical - the outside of the hull is flat and fairly vertical. I believe you'd have to heel pretty far to get planing action on such a hull. A symmetrical v would give you that action, and the less deadrise the quicker that would happen - but would it be as good upwind? And the chined v, with smaller amount of deadrise will present a planing section earlier, with boards might be the better of both worlds. I'm not convinced that on a decently made boat that the dagger slots should present a lot of drag relative to everything else.
I'm very intrigued by the hull shape of the Blade F-16 - with flat sections going all the way out to the bow stem. To me, the Blade is to the T-4.9 as the N-20 is to the N-6.0. Although I've not sailed the 4.9 or Blade, it appears that like the 6.0 and N-20, there are times when the 4.9 is faster, but on the whole the Blade is the faster boat. The main differences being the flatter hull sections. | | |
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