Laser (ILCA) S-turn technique when sailing downwind

Рет қаралды 76,430

WB- Sails

Күн бұрын

Пікірлер: 32

@mjuliofranco 2 жыл бұрын

Awesome!! Brilliant model! Thanks for sharing,

@PeterLaFontaine-h8b 6 ай бұрын

These are awesome, cam you do more simply fascinating

@ILCALaserSailor 2 жыл бұрын

This is great thank you for sharing! #ilcalasersailor @ilcalasersailor

@Alexandra-qw3hp 2 жыл бұрын

Super interesting. What do you think is the impact of the frequency? Does it also help to do the S turn, trimming and rolling more slowly? (That way you don't risk to get a penalty.)

@casatv8916 2 жыл бұрын

Awesome! You should make one on snipes sailing downwind, with the pole and the flying jib and no spinnaker...

@sankdom4598 Жыл бұрын

Should I pull up my center board for the s turn? I'd assume so right but wouldn't that make it a little harder to turn accurately

@trackie1957 2 жыл бұрын

Great information, though I would have preferred actual human voices narrating. I muted and used captions instead.

@bug9999 2 жыл бұрын

thanks bro~~

@TheDigger76 2 жыл бұрын

Is this even ok with rule 42?

@WBSAILS1 2 жыл бұрын

Talking to umpires, yes. You are allowed to steer the boat through heeling: Heel to windward to bear away, and to leeward to head up. So the S-turns technique should be OK, while sailing in straight line and just rocking the boat is not. S-turns could be something for Finn masters, for whom free pumping is too physical.

@keyrockcdn Жыл бұрын

@keyrockcdn 0 seconds ago kzbin.info/www/bejne/n6nbpqKKo52bm9k this might answer your question number 4

@ajohncant Жыл бұрын

Awesome simulation and really interesting results! Really interesting to know that you can get so much extra power out of these S-turns. They definitely gain you a few places near the back of the UK ILCA nationals. Got to add this dissertation to the reading list. My understanding was that these turns helped you surf the waves, and keep your speed up, while not ploughing forward into the next wave until you see a gap. However, it never made sense why it was faster than surfing diagonally down the waves for several boat lengths in alternate directions (which wasn't faster than someone sailing in a straight line when I tried it)

@vincenthontarrede550 20 күн бұрын

Do you have implemented transition models for the intralaminar characteristics of the viscous sublayer? And what is your Reynolds Number please ? Y+ value would also be intersting to know

@WBSAILS1 20 күн бұрын

XFlow uses a non-equilibrium wall function to model the boundary layer. This wall model takes into account the adverse pressure gradients responsible for flow separation, important in aerodynamics analysis. Moreover, the wall model is automatically disabled as soon as the lattice size near walls is small enough to resolve directly the flow in the boundary layer. There is no transition model, XFlow assumes turbulent flow. The Reynols number varies obviously a lot in different parts of the model, as does Y+.

@timstorey8551 2 жыл бұрын

It would be interesting to see the results of this study at different wind speeds. I imagine that the differences in downwind angles to sail an asymmetric spinnaker boat downwind in light vs heavy wind would be relevant to how to sail a laser downwind in various wind speeds also.

@captainsirjackchucklebutty6147 2 жыл бұрын

Ask Sir Ben ! He would never tell you all this. Top secret ! xxxxx

@d_sparrow 2 жыл бұрын

This is amazing! Thanks a lot for sharing!!

@ross.venner 10 ай бұрын

Interesting, I shall attempt to apply this in my lowrider Hawkmoth. The scows have us beat in the lightest of light airs because they can reduce their wetted surface so dramatically by healing.

@mikemalloy1681 Жыл бұрын

how does that square with Rule 42, for ILCA Lasers?

@keyrockcdn Жыл бұрын

kzbin.info/www/bejne/n6nbpqKKo52bm9k this might answer your question number 4

@isaacislaughter Жыл бұрын

International laser class association, " formerly known as laser" ?🤨 Super interesting at any rate..cheers

@UnkleSi Жыл бұрын

Fantastic!

@bug9999 2 жыл бұрын

thanks a lot

@大阪北港ディンギークラブ-l3k 4 ай бұрын

Awesome! Thank you a lot, we learned a lot from it!

@JamesFosterSailing 10 ай бұрын

What is the equivalent underwater part of the problem; the increase in driving force isn't the full story as you are generating more drag from turning, but there are also rolling benefits to the underwater side too.

@WBSAILS1 10 ай бұрын

Good question - there's not necessarily more drag from the turning, as you steer by heeling, following the turn with the rudder. Heel means less wet area, so could be even beneficial. You are right, there could be benefits from rolling through the underwater fins, too, although the centreboard would be lifted. Maybe someday I will do the underwater sim as well.