Floyd is possibly right to say that longboards and light wind windsurfing would be better off with their own movement, but then again distinct disciplines like karting and rallying are both covered by UIM and in some cases the same mags etc. Skiing from XC to jumping to freestyle all come under the same banner, like sailing does from 98 foot maxis to Optis. There's probably less difference between a wavesailor and a longboarder than there is between maxi and its bowman and a cruising yacht and its cook, or a 12 Voetsjoel and its skipper - yet everyone from Ellen Macarthur to the Opti kids and cruisers are "sailors".
And it's weird to say that just because a sport has developed (grown, then shrunk, with technological and design and accent changes like most activities) then the original form of doing that sport and the original equipment has lost its original name to a newer form.
That's like saying that the Wright Flyer III was not an aeroplane and didn't fly, because there are modern aircraft like the SR72 Blackbird and 747 that look different and fly differently.
Look at the two sports that created windsurfing, boat sailing and surfing. Surfing has changed radically over hundreds of years, but no one says that The Duke or King Kamehamaha "weren't surfers" and that the ancient redwood boards "aren't surfboards". I'd love to see some people here tell longboard surfing world champ Nat Young that he's "not a surfer" and his longboard is "not a surfboard" because it's longer than a modern thruster and doesn't get used for tow surfing! I think you'll get a very sharp reply 'cause "Nat's Nat and That's That".
The sport of boat sailing - one of the inspirations for the first Windsurfer (TM) - has changed one hell of a lot over 150 or so years, but it's still called sailing and an old yacht or skiff is still called what it was called years before. No one says that the original schooner America isn't a yacht just because it's not like a modern IACC racer. No one tells the guys who sail replica 18 Foot Skiffs that they aren't sailing skiffs because their boats aren't lightweight trapeze-powered planing flyers.
No one tells a cross-country skier that he's not skiing because downhilling and freestyle have been invented more recently.
No one tells the guys who race historic F1 cars that they aren't racing cars because they are not carbon Ferraris or Red Bulls.
Sure, language changes, but you know what really shows this "longboards and lightwinds are not windsurfing" claim to be way off the air?? If it was true, then if you put Schweitzer, Drake, and Bert Salisbury (the man who invented the term "windsurfer" and applied it to a 12' long board sailed in light winds) all on Windsurfer (TM) longboards they wouldn't be "windsurfing" as the revisionists define it.
Now, it's bizarre to say that if the people who created the sport and called it "windsurfing" were sailing a board that is and was sold, trademarked, and called the Windsurfer (TM) and which gave its name to the sport, they wouldn't be "windsurfing" on a "windsurfer". It's bizarre to say that the competitions that have existed for the Windsurfer (TM) class for 30 years are "not windsurfing".
The other really bizarre thing is that the efforts to create the name "boardsailing" or "sailboarding" only came about after longboard sailing had become huge, short boards had appeared, and Windsurfing Int tried to keep its cool name from becoming a generic. Until then, the sport WAS windsurfing.
Sure, the term used for the sport has changed, but there is no logical reason whatsoever for sailing in the original style to have its original trademarked name taken from it. The sport of windsurfing is much wider than the wonderful high-wind stuff that some people keep trying to straightjacket it into - that's just one aspect.
By the way, the original Windsurfer, like Div 2 boards, Raceboards and other longboards, is and was steered by the feet when that is most efficient - and the "barge" can be carve gybed, tacked and foot steered a lot better than a Serenity in my experience! The Serenity is nice, but whether it is the "best, fastest and funnest displacement board" is a very open question.
FLOYD; re planing.
You don't create a planing hull by having dynamic lift that exceeds weight - that would create an aircraft! And there is always some buoyancy lift in a hull (confirmed by Mr Drake and the renowed Daniel Savitsky, planing hull research guru).
Yes, many hulls create dynamic lift but non-planing ones also create suction aft and that, with the growth of the midships trough, causes the C of G of the hull to actually sink lower - "squatting". A planing hull is one that passes through this inevitable stage and then has its C of G rise above the static (ie bouyancy lift only) position because of dynamic lift.
Have you read Marchaj, Larsson and Eliasson, Gutelle etc? They are all quite good on this.
Interestingly Marchaj uses tank test data of an International Canoe at the National Physics Laboratory (IIRC) for his planing hull drag graphs. The Canoe is a lot like a heavier, flatter Serenity and Marchaj and the NPL guys and every sailor who knows them reckons the Canoe planes;
they are certainly planing and the Serenity feels "planier".
I have done a lot of sailing against the world's best A Class cats, which have "planier" type hulls than the Spit and Stealth - the Serenity, like a D2 or a Windsurfer or the Olympic Windglider, is much much more of a planing hull.
PPS - Unregistered is right, comments like "barge" are the sort of thing that hurt the sport.