Fin Question: Symptons of wrong fin?

Fin Question: Symptons of wrong fin?

Post by Matt Melv » Wed, 10 Jun 1998 04:00:00


Hi,

Wondering what the "symptoms" of too much or too little fin are?  Is
fin selection based purely on sail size or what other factors affect
the choice?

Thanks from a renewbie.  (getting back into the sport after loooong
absence)

Matt.

 
 
 

Fin Question: Symptons of wrong fin?

Post by Wolfgang Soerge » Wed, 10 Jun 1998 04:00:00

Quote:

> Hi,

> Wondering what the "symptoms" of too much or too little fin are?  Is
> fin selection based purely on sail size or what other factors affect
> the choice?

Fin too small:
+ you have difficulty to get decent upwind performance
+ can't get the board planning well, despite enough sail & skill
+ a general tendency to smear sideways due to fin overloading at low
speeds

Fin too big (or too far back in case of US boxes):
+ Board feels stiff in the turns, tendency to bounce, especially if
  one does anything else than 100 % commited wide race-type jibes.
+ Slalom and race boards tend to rail up on the leeward rail when
  ridden on too much fin.
+ No problem ggoing upwind or planning.
+ Control problems at top speed.

To feel the difference it's very beneficial to take your time once
and try some different fins with the same sail and board.
Generally, if you want to plane and go upwind, a bigger fin can be used,
for maximum reaching speed and especially if you want to learn to
jibe a smaller (for the later also curvier) fin will help a lot.

Wolfgang
--
Wolfgang Soergel                  
Lehrstuhl fuer Nachrichtentechnik / phone: ++49-9131-857781
Universitaet Erlangen-Nuernberg  /  fax:   ++49-9131-858849
Cauerstrasse 7             /     email:

D-91058 Erlangen, GERMANY /
http://www.nt.e-technik.uni-erlangen.de/~wsoergel

 
 
 

Fin Question: Symptons of wrong fin?

Post by Matt Melv » Wed, 10 Jun 1998 04:00:00

Hi Wolfgang,

Thanks for the response, I think you've just sent me off to spend some
more money.........

Matt.

On Tue, 09 Jun 1998 13:59:50 +0200, Wolfgang Soergel

Quote:


>> Hi,

>> Wondering what the "symptoms" of too much or too little fin are?  Is
>> fin selection based purely on sail size or what other factors affect
>> the choice?

>Fin too small:
>+ you have difficulty to get decent upwind performance
>+ can't get the board planning well, despite enough sail & skill
>+ a general tendency to smear sideways due to fin overloading at low
>speeds

>Fin too big (or too far back in case of US boxes):
>+ Board feels stiff in the turns, tendency to bounce, especially if
>  one does anything else than 100 % commited wide race-type jibes.
>+ Slalom and race boards tend to rail up on the leeward rail when
>  ridden on too much fin.
>+ No problem ggoing upwind or planning.
>+ Control problems at top speed.

>To feel the difference it's very beneficial to take your time once
>and try some different fins with the same sail and board.
>Generally, if you want to plane and go upwind, a bigger fin can be used,
>for maximum reaching speed and especially if you want to learn to
>jibe a smaller (for the later also curvier) fin will help a lot.

>Wolfgang
>--
>Wolfgang Soergel              
>Lehrstuhl fuer Nachrichtentechnik / phone: ++49-9131-857781
>Universitaet Erlangen-Nuernberg  /  fax:   ++49-9131-858849
>Cauerstrasse 7             /     email:

>D-91058 Erlangen, GERMANY /
>http://www.nt.e-technik.uni-erlangen.de/~wsoergel


 
 
 

Fin Question: Symptons of wrong fin?

Post by TS » Thu, 11 Jun 1998 04:00:00

Acording to Fin Works you will not be far away if you take the size of the
sail in sq. meters and multiplie it with the area of the sail. The number
should be the approximate area of the fin in sq. cm. Check out:
http://www.sailusa.com/fins.html

TS


Quote:
>Hi,

>Wondering what the "symptoms" of too much or too little fin are?  Is
>fin selection based purely on sail size or what other factors affect
>the choice?

>Thanks from a renewbie.  (getting back into the sport after loooong
>absence)

>Matt.

 
 
 

Fin Question: Symptons of wrong fin?

Post by TS » Thu, 11 Jun 1998 04:00:00

Nice one, right? I try again: Multiply the size of the sail in sq. meters
with 50. The number should be the approximate area of the fin in sq. cm. It
is really this that is the magic number, but lenght is easier for us to
relate to.  Check out:
http://www.sailusa.com/fins.html

TS


Quote:
>Acording to Fin Works you will not be far away if you take the size of the
>sail in sq. meters and multiplie it with the area of the sail. The number
>should be the approximate area of the fin in sq. cm. Check out:
>http://www.sailusa.com/fins.html

>TS