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#257044 - 02/06/13 04:48 AM Re: My F16 Blade build [Re: Rolf_Nilsen]  
Joined: May 2003
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Rolf_Nilsen Offline
Rolf_Nilsen  Offline


Carpal Tunnel

Joined: May 2003
Posts: 4,451
West coast of Norway
Hi Sam,

we are getting closer to diving into foils, but not quite there yet!
I dont remember if sections was included in the plywood plans. What I know have been used as a safe section earlier is NACA0007 for daggers and NACA0012 for rudders. But there is a whole world of sections available and tuning that can be done. A very nice catsailor here sent me profile data for a modified NACA0013 to be used as both daggers and rudders. Then there are DAG sections which are used on quite a few catamaran foils..

Planform is also very important.



Not too much info is available but most in the know-how will answer direct questions on a good day.
We will start with proven sections and planforms and eventually make insets if we build experimental sections later on.

Place your bets and hold your breath smile

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#257060 - 02/06/13 09:20 AM Re: My F16 Blade build [Re: Rolf_Nilsen]  
Joined: Jan 2005
Posts: 6,021
Timbo Offline
Carpal Tunnel
Timbo  Offline
Carpal Tunnel

Joined: Jan 2005
Posts: 6,021
Sebring, Florida.
Once you get the section sorted out, just make them 2 meters long...or longer.

;^)


Blade F16
#777
#257088 - 02/06/13 02:48 PM Re: My F16 Blade build [Re: Rolf_Nilsen]  
Joined: May 2003
Posts: 4,451
Rolf_Nilsen Offline
Rolf_Nilsen  Offline


Carpal Tunnel

Joined: May 2003
Posts: 4,451
West coast of Norway
2 meters!! Bethewaite was on to something but pulled out before it became ridicilous!

#257098 - 02/06/13 04:07 PM Re: My F16 Blade build [Re: Rolf_Nilsen]  

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Originally Posted by Rolf_Nilsen
2 meters!! Bethewaite was on to something but pulled out before it became ridicilous!


Welcome to modern cats, there is a table of standard F18 board sizes here (last page)

#257115 - 02/07/13 03:00 AM Re: My F16 Blade build [Re: ]  
Joined: May 2003
Posts: 4,451
Rolf_Nilsen Offline
Rolf_Nilsen  Offline


Carpal Tunnel

Joined: May 2003
Posts: 4,451
West coast of Norway
Thanks for the link. 1965x23x192mm is.. Well, a challenge.

Considering the lower boat and perhaps also crew weight of an F16 a smaller foil is probably the optimum. But the trend is clear. Longer and slimmer foils.. Where is the practical limit and is it only a trend that will reverse in time.. I dont know, but I do think we will continue to see long and slim foils smile

#257123 - 02/07/13 07:34 AM Re: My F16 Blade build [Re: Rolf_Nilsen]  
Joined: Jan 2009
Posts: 5,525
pgp Offline
Carpal Tunnel
pgp  Offline
Carpal Tunnel

Joined: Jan 2009
Posts: 5,525
Picked this up on SA: " On an older A-Class with smaller transoms, the conversion from straight to curved boards may have a better chance for improvement if rudder winglets are also included in the upgrade.

There's no doubt that curved boards are here to stay. "

http://forums.sailinganarchy.com/index.php?showtopic=144251#entry4037605

I suppose, that if that is true, we should address the issue in the rules.

Last edited by pgp; 02/07/13 07:38 AM.

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.

#257129 - 02/07/13 08:45 AM Re: My F16 Blade build [Re: Rolf_Nilsen]  
Joined: Dec 2001
Posts: 5,573
waterbug_wpb Offline
Carpal Tunnel
waterbug_wpb  Offline
Carpal Tunnel

Joined: Dec 2001
Posts: 5,573
Naples, FL
Originally Posted by Rolf_Nilsen
Where is the practical limit ?


I would suspect currently, the limit would have to do with the stiffness of the foil using current materials/technology.

Until, that is, I develop "transparent aluminum"


Jay

#257154 - 02/07/13 01:36 PM Re: My F16 Blade build [Re: Rolf_Nilsen]  
Joined: Jun 2001
Posts: 3,904
David Ingram Offline
Carpal Tunnel
David Ingram  Offline
Carpal Tunnel

Joined: Jun 2001
Posts: 3,904
Clermont, FL, USA
Originally Posted by Rolf_Nilsen
Thanks for the link. 1965x23x192mm is.. Well, a challenge.

Considering the lower boat and perhaps also crew weight of an F16 a smaller foil is probably the optimum. But the trend is clear. Longer and slimmer foils.. Where is the practical limit and is it only a trend that will reverse in time.. I dont know, but I do think we will continue to see long and slim foils smile


Speaking as a player in the F18 fleet I don't see the daggerboard length trend ever reversing. Granted there is a pretty small window where they pay but that's where the game is being played now. I'm still running the short boards mainly because I like saying "It's not the length of your daggerboard it's how you use it"


David Ingram
F18 USA 242
http://www.solarwind.solar

"Do or do not. There is no try." - Yoda
"Excuses are the tools of the weak and incompetent" - Two sista's I overheard in the hall
"You don't have to be a brain surgeon to be a complete idiot, but it helps"
#257170 - 02/07/13 02:49 PM Re: My F16 Blade build [Re: David Ingram]  
Joined: Dec 2001
Posts: 5,573
waterbug_wpb Offline
Carpal Tunnel
waterbug_wpb  Offline
Carpal Tunnel

Joined: Dec 2001
Posts: 5,573
Naples, FL
enzyte baby...enzyte


Jay

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