View Full Version : Who´s faster on 15knots?

9th January 2009, 04:44 PM
Hi all,
This next sunday we are having the II Fast-val , sort of speed contest.
32 competitors with heats of 4 each time, 500m only one leg on beam reach.
The forecast is about 15k, a bit stronger of what windguru says http://windguru.com/pt/index.php?sc=3624. It´s a lake, some chop, but it is flat water.
Any gear is allowed, and probably about 10-12 are gonna be formula guys who don´t have slalom to chose. Some are good sailors, and there are very good slalom guys who don´t have formula either...
Other thing is Fevesc (Santa Catarina Sailing Federation) and a TV channel are prizing the first ones with some cash... The first one is getting BR$1500!!!!
What are your bets, if we had hypothetically two sailors with same skill and competitive gear, formula against slalom, with that forescast on flat water ??

9th January 2009, 05:25 PM
15 knots max over 500m Formula.
If carrying GPS big slalom might post best Vmax.

If 15 knots steady gusting bit more big slalom on (assuming 90 degree beam reach) might do it.
(Covered it all )

PS Board with best VMG !!!

9th January 2009, 06:51 PM
On sunday, after the event I´ll post the results, as I don´t believe there´s a website for it...
Hey floyd, whats PS board?

9th January 2009, 06:59 PM
My bet is that with steady 15 knots on flat water a light guy on a slalom equipment should be the fastest over 500m. Is Schurmann participating?

mark h
9th January 2009, 09:23 PM
XXL Slalom (iS133/Fanatic Falcon 145 etc), a 9m and a fast 45/48cm fin should be good for nearly a 2:1 wind ratio, steady 15k should see 25/30k beam reaching on the 500m course.

9th January 2009, 09:34 PM
I would bet on a large slalom board too, something well balanced with a 9-10 m sail.

For a formula board to be faster on a beam reach, the wind would have to be pretty light, probably 10 knots or less.

9th January 2009, 09:57 PM
Me. ;) always.

9th January 2009, 10:10 PM
100kg+ formula guy will win. If the water is flat...

9th January 2009, 10:39 PM
My bet is that with steady 15 knots on flat water a light guy on a slalom equipment should be the fastest over 500m. Is Schurmann participating?

Schurmann won the last year´s , Im not sure about the gear as i could not go, but he probably is gonna be there this one also

9th January 2009, 10:44 PM
Untill max. 15k. Formula with 85 kg sailor 11m sail , fin 66-68cm and no rake (I am 90% sure) will win the speed contest.
But over 15 k. there is no chance for Formula to beat the bigger slalom boards, that is my experience at the greek slalom blaster we race in Greece where all the categories of Windsurf are racing together.

10th January 2009, 08:22 PM
Whats the wind angle likely to be ?

If big Slalom isn't faster reaching in 15 knots then it they have a very small window of superiority before mid size slalom takes over ?

11th January 2009, 02:19 AM
15 knots is not marginal winds. A big slalom board will be well powered with a 9.8 sail, with its smaller wetted surface and fin it should be quickest when the course isn't very high or deep. You only need 100 cm width and 70 cm fins for pointing or planing in the marginal stuff. And yes I agree with #11, if the big slalom boards aren't the fastest boards in 15 knots, what's the point in having them? Thats the theory, reality will show. Very interesting topic..

11th January 2009, 01:23 PM
2 years ago we had same situation.
Bjorn was on a 80cm SL 9,8sqm and a 48fin.
My friends and me was on Formula with 11 sqm.
Finally I would say over 500m average the F will win. Maybe topspeed by SL. But all very closed in 15kn.
But:!!!!! If you go trough gates you can influence the result by choosing the wind angle.
My bet is only valid for free course for everybody.

12th January 2009, 12:48 AM
This is a tough one. In 15 knt winds I hit faster max speeds on my big slalom gear then I do with my formula gear using the same 9.8 sail. In the big gusts, to maintain control, the slalom board accelerates where the formula board points up or down wind. Also, I know you loose more speed over distance in lulls then you gain in gusts. So over a 500 meter beam reach course with 15 knt averages it would be very close. The more lulls, the lower the lulls, the bigger the advantage to the formula I think. The more gust, the bigger the gusts, the more advantage to the slalom board.

12th January 2009, 04:12 PM
Very light winds during the whole event, with formula being the best option. However in the final, it rose up to 18k, with Schurman swaping from formula to slalom kit in the last minute... The final results were:
1º - Slalom kit (Lang)
2º - Slalom kit (Schurman)
3º - Formula Experience kit (Neves)
4º - Formula kit (Tomas)

Still my bet is that if it was 15k steady, with 2 sailors same level, the formula wins. Just a guess though.

Abraço e bons ventos