Wiki Sail by GRF

Right they're bored again, and need some more piss taking semisailingscience from the master of virtual physics.

To recap facts concerning laminates with bubbles being faster than laminates without bubbles which of course I've now proven beyond any doubt, but they are still covering their ignorance with irony over on the photo thread.

There followed an exchange about a Tv program about bubbles to which I came across with this gem.

"I hope it works I'm already fitting bubble expulsion kit to the Alto..

Years ago we tried a ram air system to stream air from the rear of chines under the hull in speed boats.

Wish we'd had laminates with bubbles in them back then, they'd have been much faster.

Oh, now I've just thought of something else, I'll copy this to the wiki, think I can get you going all over again on hygroscopy.."


So now, bubbles aside which is already proven and true now it's been on that BBC4, so what do the team think about having a laminate that used hygroscopic (not sure if that is the term there are two one meaning expels water the other meaning attracts water as per fish scales) anyway there are plastics that have this feature, I was thinking about it back in the V2 early days. There are sprays, we used them back in the water ski racing days, made hulls super skippy, probably banned in your world.

So the question is do you deny they a)Exist and b)Work to make your boat faster and if so why, or if not why not. (I know they do but could never understand exactly why).



Edited by iGRF - 12 Apr 13 at 4:30pm

I understand why Rule 53 might try to prevent the release of harmful substances, but I've never understood why it seeks to control surface texture. Isn't that a matter for individual classes?

This goes back to the sharkskin tech in swimming, and sub boundary layer vortex generators. It's the argument of super smooth vs rough finish. The fluid dynamic theory indicates that a benefit is achievable when using such a device but in practice the empirical testing completed by the likes of Bethwaite for example show that it's difficult to get a benefit. This is possibly due to water/air interactions and also 6-component dynamics ie our boats don't tend to go straight through water, they pitch and yaw and accelerate fairly violently, rather than operate at a fixed condition.
Discuss...

Edited by craiggo - 12 Apr 13 at 4:50pm

Originally posted by craiggo This goes back to the sharkskin tech in swimming Discuss...