Wiki Sail by GRF

I'd reckon actual designers DO consider displacement. They'd be foolish not to.

Originally posted by fab100 I love the ways GRF's theories bear no relation to the laws of physics, whether its about buoyancy, jibs interacting with airflow over mainsails [sorry 'front sails' interacting with 'back sails' - lapsed into the quaint, outmoded, brainwashed, apparently foolish habit of using the proper name for things there] So perhaps our hero could use this wiki to define The iGRF Laws of Physics, being obviously right, rather than the best those doddering imbeciles from Archimedes, thru De Vinci and Newton to Einstein and Hawking and all their peers could come up with. Without our illustrious forum oracle, all they could think of was these. Poor deluded fools. Such wasted lives. Luckily it's looking like our saviour may well now enlighten us (and them) - which excites me greatly as it could really give my son an edge with his physics PhD. And eat your heart out all those learned institutions; you are nothing to the power of the Y&Y forum - also wake up you Nobel lot - a shoe-in approaches. The prize could fund the next v-twin methinks.

I'm wondering if the problem is that GRF is confusing "bouyancy" and "displacement". The two aren't the same for open vessels such as boats- and really the same for larger windsurfers either, as they have a considerable volume ("bouyancy"?) above the waterline. Boats will still float (indeed, float higher, what less weight in them) if you remove all bouyancy tanks, bouyancy bags etc from inside the hull shell, but if you started filling that empty shell with water, they'd sink due to lank of bouyancy. Yes?

Originally posted by 2547 I wonder if iGRF could redirect his genius to solve the national debt, that would be far more use than a V3.

Well whatever you call it, you have to bear in mind, we consider an enclosed volume, you don't, since you are sitting within it, so yes maybe displacement is a better term, but it essentially counts as the same thing, the amount of volume that the boat uses by displacing water to support the crew weight the greater the area, the bigger the crew, the faster in low winds.

How do you measure that then?

And, why isn't it published?

You couldn't sell a sailboard without the published volume

Why is it you are all happy to buy your boats just on the say so of your friend, your club or because everyone else sales them so you step up to be shawn..

The sail thing, I guess is the same reason that a hercules heavy lift aircraft wing is lower aspect than a fighter jet. At lower speeds, the greater chord length of the combined jib and main which act in unison in reality are more efficient than the same area projected vertically in say a high aspect wing mast.

However the higher the wind speed, due say to increased created wind increasing the apparent wind, the reduced parasitic drag of a smaller surface area is more efficient. I don't believe it has anything to do with wind being faster a few feet up than closer to the surface, that's bollox imv

As to bloodlust, you kind of get that with dumb animals, you just need to crack the whip and get them back in their boxes..

Edited by iGRF - 26 Mar 13 at 3:07pm