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@@SamuelLanghorn great question. a few options: mischa heemskerk recommended to me sanding foils with coarser grit (eg 600 or 800) the colder the water. that helped, but not entirely. smoother sheeting and better body weight management can help aa well. finally when switching to exploder and their foils i saw biggest improvement. so i am concluding that foil shape has a huge role in this. even in these smaller boats vs americas cup multiyear foil tuning

@@flyinggorilla ...Switching to "exploder" what is exploder? a specific foil type? sanding: in one of my first books in competitive sailing I took note of the comment to give the hull and foil a little texture so that a thin water film can build up.... I did not know that there is a relationship between coarseness and temperature?

@@SamuelLanghorn 1) exploder is polish boat maker who also creates foils. their A-Cat foils ventilate less likely than the ones in the video, as theirs have a slightly different shape 2) salt water is heavier and less likely to ventilate than fresh-water 3) while cold water has also higher density, the issue is increased viscosity that can cause sooner ventilation. hence the coarser grit should help the flow stay attached.

@@flyinggorilla ok, verstehe. ....ich denke Dein Deutsch ist nicht so schlecht🙂 ich bin gerade dabei, meinen neuen Bootsentwurf zu konzipieren, deshalb schaue ich mich ein bisschen bei den aktuellen Foils um. Der A-Cat ist da sicher kein schlechtes Beispiel. Verkauft Exploder auch einzeln einen Satz Foils? Interessant, wie die Polen sich im Bootsmarkt etabliert haben. Schoene Gruesse vom uebern Teich Sam

@@SamuelLanghorn sie bieten die foils im online shop an. würde allerdings per email anfragen.

@@Kognito72 you still need to be careful. best to always stay a bit sideways (eg hips) and dont lean directly with the belly and thus hook on the boat. i had punctured my hull once with the hook. learned since then.

sorry, could you be more specific what your ask is?

@@flyinggorilla could you share a quick video on that little cradle and slipway you have for your catamaran that you launch it from the shore into the water please

exploder 2022. yes there is a big difference. the new exploder daggerboards are more stable and forgiving than any i had before.

the spanish company Telemetry overlay has the best software for that. it is affordable and has powerful sync options. simple video overlays are easy. for multi-cam videos i figured exporting the speed overlay with green-screen works best (and use the overlay in the video editor as an additional track). and gopro 11 should work fine, telemetry overlay extracts gps data directly from videos.

indeed the upwind performance is worse than a straight board cat as the water resistance of the large foils is so much higher. downwind performance is roughly similar, i go downwind 17kn with a straight board F16. however, to learn foiling this boat was really helpful and fun.

@dunk856 When I first read your comment, I thought it ended with "plus a good dose of brewery!"

Exploder a-cat

This boat is super lightweight and only 18ft long and has less than 90kg. So it is a boat that is suited for relatively flat water anyway. You could still use longer foils, but then the drag becomes higher in non-foiling displacement mode. In that mode a foiling A-Cat is already slower than the non-foiling peers, just because of the drag from the longer rudders. The final argument is class regulation that dont allow any longer ones or drastically different shapes like t-foils. hth

ok, i ask you!

@@flyinggorilla then you can't uncleat the main in time - or at for some reason it did not go out and, of course this has never ever happened to me...

​@@SpaceCrete all good questions. there is no cleat, so it was me hanging on. mischa heemskerk watched the video and suggested more rudder rake, so that the foils dont lose grip that easily, and the wind gust doesnt blow under the tramp lifting it. what we observe is that i tried to tighten the main really hard and simultaneously turn into the wind. however i lost grip on the foils so that maneuver failed. the gust came like a hammer from 10 to 25 knots in a secod. so probably yes, a different reaction, or even better an earlier reaction would be needed.

@@flyinggorilla That is my problem - not reacting fast enough. Going upwind it is amazing how much a cat main depowers with minimal release. Reaching, not any sure options, depending on the boat. Head up and flip. Head down and pitchpole. But the rudders don't seem to work very well just in air.

foiling A-class fully rigged is about 90kg. classic A-Class boats are at minimum 75kg.

surprisingly good. works well from trapeze. also it is in reach to start the race timer, or ping the line.

It really is!

Thanks. It is lake Attersee in Austria, right in front of the alps.

thanks for watching! indeed, in that light conditions it is very risky to chase for velocity. However, we raced A-Class classic (non-foiling) and A-Class foiling together, and as the classics have less water resistance and a sail shape that works better for non-foiling downwind, there is no chance to win against the classic boats but try to get onto the foils when there is a reasonable chance. I lost the bet with choosing foiling mode, but displacement mode wouldnt have brought me to the front either. The Austrian A-Class champion foiled better than me in these conditions and took a top place in that race. bottom line you are right, I learned in further light wind regattas this year that more patience and being more conservative by going downwind shortest distance, very very deep derisks and pays off more often than it harms due to a lost opportunity of speed. thanks!

Yes! Thank you! Only caveat: i broke the tiller extension. you can hear the crack of the carbon tiller extension in the video. I do have replacements of those as it is better to break the tiller extension than the cross-bar or rudder stocks of the boat.

yes, I know what you mean. however, i figured the risk of injury is lower if staying attached to the boat vs. making a flight off around the boat while hanging in the trapeze. in fact i took a small injury away during this capsize, but not on the foot in the footstrap. it is the forward foot taking all my body mass and inertia that strained my foot tendons. so while i generally agree with your comment, I feel only safe on this boat when "locked in". thx for watching!

@@flyinggorilla Yeah it’s a tricky balance. Had a few similar incidents on the Musto and a board. I’ve always wondered if there isn’t a better solution for footstraps - something that lets go under too much tension etc.

Those froot loops looks sketchy as well, we don't eat those around here but I feel like I digress

great observation! I probably had too much lift on both foils and rudders. Those angles are adjustable on the water.

yes, thats cool. the shape of the main foils is also somewhat self controlling, because the higher the flight the lower their lift. to a limit.

Thanks for watching!

hah! indeed that drove me nuts too. in the meantime i got great advise from steve brewin to make two small modifications to stop the flapping. now i just need proper winds to prove it works :-)

I have the same problem with my deck sweeper, except I have a bungee to try stop it

indeed. always hard to estimate how much to try to go onto the foils or go straight downwind. as foilers have more drag than classic a-cats flight time is essential. still lots to learn, its great fun

same as boat class :-) which is 75kg

~35kEUR Segelfertig und damit eigentlich in der ähnlichen Preisliga wie eine Motte.