Contact   Imprint   Advertising   Guidelines

"cutout" in rear of race boards?

Forum for everyone who is into racing and speeding on kites.


NorCalNomad
Frequent Poster
Posts: 287
Joined: Thu Feb 13, 2014 4:40 am
Kiting since: 2013
Local Beach: San Francisco
Gear: Why should it matter?

"cutout" in rear of race boards?

Postby NorCalNomad » Mon Apr 28, 2014 6:25 pm

Seen this in a few race boards but what is the thinking behind the cutout or stepdown in surface at the rear of the bottom race board like in this photo.

Image

FrederikS
Medium Poster
Posts: 165
Joined: Sat Nov 24, 2012 3:33 pm
Kiting since: 0
Brand Affiliation: None

Re: "cutout" in rear of race boards?

Postby FrederikS » Mon Apr 28, 2014 6:29 pm

Probably to minimize wetted surface once the board is planing.

ronnie
Very Frequent Poster
Posts: 3475
Joined: Sun Jul 24, 2005 6:39 pm

Re: "cutout" in rear of race boards?

Postby ronnie » Mon Apr 28, 2014 8:02 pm

On windsurf boards, they claim they give better acceleration and a higher top speed.

http://www.star-board-windsurfing.com/2 ... oard-range

eree
Very Frequent Poster
Posts: 1254
Joined: Sun Jul 13, 2008 9:49 am
Kiting since: 0
Brand Affiliation: None
Location: shallow sea

Re: "cutout" in rear of race boards?

Postby eree » Mon Apr 28, 2014 10:15 pm

as you already got it, it is most probably a wishful thinking.

matth
Very Frequent Poster
Posts: 948
Joined: Wed Apr 03, 2013 1:18 pm
Kiting since: 2011
Local Beach: Revere, Nahant, Chapin, West Dennis, Hardings , Kalmus, First Encounter, Dog
Favorite Beaches: West Dennis, Kalmus, Chapin, Revere, Nahant, Dog
Style: Freeride
Gear: 8m,10m, 12, Switchblades, 14m Velocity . Cabrinha Ace, Shinn Monk, Litewave DV8
Brand Affiliation: None

Re: "cutout" in rear of race boards?

Postby matth » Tue Apr 29, 2014 1:36 am

I think its about release which helps speed. Light wind boards have really wide tails for planning power but that leaves you with a long trailing edge which has more drag . The cut outs help reduce the effective area and speeds things up. It must work because it has been around for a long time.

ronnie
Very Frequent Poster
Posts: 3475
Joined: Sun Jul 24, 2005 6:39 pm

Re: "cutout" in rear of race boards?

Postby ronnie » Tue Apr 29, 2014 10:35 am

Nearly every windsurf Formula race board has the cut outs, so they have been established for many years and therefore must work on a windsurfer. The slightly wider release edge length while still having the fin back and getting more control from the narrow tail seem like things that should help a kite raceboard too.
The cut-outs are used on many performance slalom and freeride windsurf boards too and are difficult and expensive to include, so they must work for those boards too.

Johnny Heineken had a Mike's Lab board with cut-outs which could be filled with blanks but seemed to prefer the cut-out blanked. I'm sure if kiteboarding had gone into the Olympics there would be no doubt whether cut-outs worked or not as they spend fortunes testing much smaller details in Olympic disciplines.
I would expect the cut-out to affect the trim of the board and the positioning of the footstraps and possibly the fins, so I'm surprised that they didn't have two separate boards to compare.
You can see Erika is using it with the blanks in at 6 minutes in this video.


wdric
Frequent Poster
Posts: 229
Joined: Fri Dec 26, 2003 12:52 am
Kiting since: 0
Brand Affiliation: None
Location: Australia

Re: "cutout" in rear of race boards?

Postby wdric » Wed Apr 30, 2014 8:59 am

A 2014 green board may have these cutouts!

ozchrisb
Frequent Poster
Posts: 275
Joined: Sat Dec 29, 2012 2:59 am
Kiting since: 1999
Brand Affiliation: None

Re: "cutout" in rear of race boards?

Postby ozchrisb » Wed Apr 30, 2014 10:52 pm

Haha and I was about to say they didn't work because nobody did them on kiteboard anymore :D



Return to “Kiteracer”

Who is online

Users browsing this forum: No registered users and 3 guests