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Re: F16 board length and F16 class rules [Re: pgp] #246574
03/31/12 07:08 AM
03/31/12 07:08 AM
Joined: Jan 2009
Posts: 5,525
pgp Offline OP
Carpal Tunnel
pgp  Offline OP
Carpal Tunnel

Joined: Jan 2009
Posts: 5,525
+1

Thanks Wouter.


Pete Pollard
Blade 702

'When you have a lot of things to do, it's best to get your nap out of the way first.

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Re: F16 board length and F16 class rules [Re: pgp] #246581
03/31/12 11:21 AM
03/31/12 11:21 AM
Joined: Sep 2005
Posts: 893
W
waynemarlow Offline
old hand
waynemarlow  Offline
old hand
W

Joined: Sep 2005
Posts: 893
The price of the carbon boards is a bit artificial at the moment, the more manufacturers that get involved the cheaper they will become.

My worry about limiting the aspect ratio to less than 5 is that there is a fair bit of foil design going on at the moment and new foil shapes are appearing that give good handling with minimum drag at high aspect ratios. If we limit the aspect ratio, will we miss out on the benefits of these new foil shapes and become slower boats in comparison to the F18's etc.

The other factor is the SCHRS and Texel handicapping systems are very aware of the advantages of high aspect boards and steadily increasing the handicap attributed to the boards, very soon they will penalise these boards and we will all back to square one.

Another problem will be if the Viper is selected for the Olympics and goes immediately to longer high aspect boards ( they after all will be sailed by some of the worlds best ) then we immediately exclude them from the F16 class, I for one would love to at some stage compete against these guys just to learn how good you have to be.

I'm not sure it is a problem yet and think we could perhaps let things lie for a year or two.

Re: F16 board length and F16 class rules [Re: pgp] #246584
03/31/12 12:20 PM
03/31/12 12:20 PM
Joined: May 2003
Posts: 4,451
West coast of Norway
Rolf_Nilsen Offline

Carpal Tunnel
Rolf_Nilsen  Offline

Carpal Tunnel

Joined: May 2003
Posts: 4,451
West coast of Norway
Quote
A 0.1445 sq. mtr daggerboard with a wetted length of 0.85 mtr will have an aspect ratio of exactly 5. Such a board will have a width at its root of about 0.175 mm. This appears as the optimal F16 daggerboard when going on the math numbers.


Width 0.175mm?? Are you going supersonic smile

Amateur contests are best for amateurs.

Re: F16 board length and F16 class rules [Re: pgp] #246585
03/31/12 01:41 PM
03/31/12 01:41 PM
Joined: Feb 2005
Posts: 4,118
Northfield Mn
Karl_Brogger Offline
Carpal Tunnel
Karl_Brogger  Offline
Carpal Tunnel

Joined: Feb 2005
Posts: 4,118
Northfield Mn
I'm thinking thats supposed to be 17.5mm. Crazy kids, and your silly french measuring systems.

I'm game for supersonic, though I think the winds would be a bit hairy.


I'm boatless.
Re: F16 board length and F16 class rules [Re: pgp] #246587
03/31/12 02:06 PM
03/31/12 02:06 PM
Joined: Oct 2011
Posts: 217
Palm Harbor, FL
daniel_t Offline
enthusiast
daniel_t  Offline
enthusiast

Joined: Oct 2011
Posts: 217
Palm Harbor, FL
I'm probably going to expose my ignorance here, but why not just put a hard limit on maximum draft? I mean, we have a limit on maximum length, maximum width, and maximum mast height so why not? That way designers can use any aspect ratio they want.



Daniel T.
Taipan F16 - USA 213
Re: F16 board length and F16 class rules [Re: daniel_t] #246592
03/31/12 04:26 PM
03/31/12 04:26 PM
Joined: Jun 2001
Posts: 9,582
North-West Europe
Wouter Offline
Carpal Tunnel
Wouter  Offline
Carpal Tunnel

Joined: Jun 2001
Posts: 9,582
North-West Europe

wetted length is basically the same as draft.

Your idea is the same as mine. I didn't propose any rule on aspect ratio although a limit on that is somewhat implied.


Wouter Hijink
Formula 16 NED 243 (one-off; homebuild)
The Netherlands
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