A few of the newer boards coming out have a large single concave running the length of the board. These can be 10mm in depth and a pain to hand shape. Anyone know the reasons behind these? Seems to be a kiteboard only thing.
Thanks
Which boards?
Big concave all the way through will give you early planing, nice big carving turns and reduce snappy turns a bit. can also make a board ride smoother.
But the whole thing depends on combining with out line and general width to length etc
correct me if iam wrong (someone here will ) cocave = steering
yep the fins do so much but between concave and rocker it is a bit like power steering to non power steering in the car . so what the aim is smaller fins (less drag) more concave so you can steer . Also helps to edge in kitting like digs board into water better .Some boards are low wind boards no fins but concave in them .
The BWS Drifter and the Slinshot Celeritas both use the large concave, probably others too that I haven't seen.
Probably an easy thing to do when CNC shaped, takes more effort when hand shaping. Just wondered if it was worth the effort, flat is pretty easy.
Agree that the concave may help reduce the requirement for fin size, thus less drag. And the concave would have a similar effect to a slight V, smoothing out the slap of the nose, we used a slight V on sailboards for this reason.
I guess it is worth a try, blanks are pretty cheap. I am finding production boards are too heavy for jumps (strapless), they have to be or they would break too often.
full length deep concave is to maximise the lift. ie. plane early. Usually seen on the short trunk style of board. It is the opposite to vee, which will sit into the water more, be slower but smoother and give easy rail to rail turns. I doubt that more concave would allow any smaller fins.
most modern surfboards have some sort of concave, whether single or double etc
same with windsurfers used for waves and kite boards used for surfing.
they work real well with it. i used to have flat many many years ago, but performance not as good . i had some V in the tail on one sailboard but that was a dog for turning
the concave, shoot me down or add some inteligence.
playing with an old single fin surfboard blank, will become tri.
have shaped tunnels on each side of C/L, not too late to shape a single concave.
the tail is not broard, ?? where stop the cave in relation to fins and a wide,flat
fat arse,etc.
merci
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I have been shaping concaves since 1970....they are great if done well...my theory is they give lift...and of course speed...two elements that are needed in a good board...they do start to suck onto the wave face at speed though ,so this is where a good rail profile is important...great way to see a concave in motion is to turn on the garden hose and rest a spoon on the water flow, rolled side down..it even feels slugish when the water flows over it...now turn the spoon over and you can feel straight away how lively it feels...dont know if a concave will enable you to use smaller fins though...I am using around 10ml of concave in my kiteboard, with a lot of rocker, it works great forhand but my staighter...less concaved other board seems better on my backhand....like all surf design...its unscientific...if it feels good for you its right.
