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View Full Version : Why not a quad fin formula board??


Unregistered
27th June 2009, 06:37 PM
Does it make sense?

Unregistered
27th June 2009, 10:34 PM
It doesn't make sense at all.

Ken
27th June 2009, 10:39 PM
Four 17.5 cm fins = 70 cm.

17.5 cm too sort for flexing?

Same drag, less drag, more drag?

Four custom 17.5 cm fins = expensive.

Four tuttle boxes, eight bolts = more weight

Too much to comprehend at the moment.

nonopr
27th June 2009, 11:36 PM
Basic logic. Have you seen a sailboat?.

crazychemical
28th June 2009, 12:25 AM
I owned an old Klepper120 which was an oldskool slalomboard with 3 fins. I remember that at first i always put in all 3 but then one day 1 of them broke and since you can't find that finbox anymore i had to sail twinfin. The first thing i noticed when i went out was that it suddenly tacked and jibed much faster. Then i tried the one fin setting and it went through the curve like a modern freerider.
I guess that with 3 fins or more you increase the sideways resistance of the board making the turn more physical for the sailor however increasing planningtime and eventually speed? I mean, the twinfins where praised because they created a bigger spray and jumped higher. A big spray is made by 1) pure legpower and 2) the board not slipping away over the wave because of that power, ie a slower curve. And big speed = big air so the planning issue and speed issues i noticed could be explained.
So i don't really see the problem in making quadfin formulas though i'd have my doubts considering a quadfin slalomboard.

just my thoughts ...

Unregistered
28th June 2009, 04:47 AM
That brings me to my point:

What is so good about the quad fin then?

Hot Ice
28th June 2009, 04:56 AM
That brings me to my point:

What is so good about the quad fin then?

Fast and skatey.

Remi
28th June 2009, 07:14 AM
Hi All,

The main reason is first because is a Class and we have to play with the rules.

Only one fin, second price, weight but of course will be interest to test to see what's going on.

All the best

Unregistered
7th July 2009, 04:46 AM
Do you think you could handle a quad finned formula board?
Imagine the forces trying to gybe the thing in more than 15k!!
Your ankles would be ripped out of their sockets.

Unregistered
7th July 2009, 07:43 AM
For a formula board you need a deep fin that flexes to allow the fin to bend enough to fly the board. Short fins might proved lateral resistance but the board would sit too flat on the water.

Ola_H
7th July 2009, 04:45 PM
Do you think you could handle a quad finned formula board?
Imagine the forces trying to gybe the thing in more than 15k!!
Your ankles would be ripped out of their sockets.

Listen to Anders Bringdal talking about speed sailing and that windsurfers might have to go to multi fin hull to catch up the monster sailboats that are not in use.

http://www.dailydose.tv/bringdal2009.htm

Ken
7th July 2009, 11:25 PM
Consider the kiters that are now course racing (upwind / downwind). They are trying to figure out what works best and all are using milti-fins at the moment. However, their boards are relatively small compared to formula boards and a single long fin simply has too much lift for their narrow boards, so they use three or four small fins. They are all experimenting with different board and fin designs, but the bottom line is that they are pretty darn fast around a formula course in windy conditions (20 - 30 knots) for a variety of reasons.

I don't think there is a direct correlation between the two (formula and kiting), but it's interesting to see them developing their sport.

Unregistered
8th July 2009, 12:29 AM
San Francisco kite racing and development.
Check out these fins.
http://www.youtube.com/watch?v=bYV3f5HCW2s&eurl=http%3A%2F%2Fstevebodner.blogspot.com%2F&feature=player_embedded

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mark h
8th July 2009, 02:07 AM
Nice video, looked like a lot fun, racing and working out what works best. I liked the "non acid rivalry" feel.