crecsent tail...yes/no?

[sf_firestarter]

I'm trying to work out the design for my next board and was considering adapting the crecsent tail design as used on many bodyboards. What would be the pros/cons of using this type of tail on a kneeboard?


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[red]

What's the pro of having a crescent tail on a bodyboard?

My guess is that it fits the body of a prone rider better than a swallow tail would. It's also easy to achieve a crescent in die cut foam, but may be another issue on urethane.

[surfhorn]

My first Freeline KB back in 1971 was a 5'0" twin fin (boxes w/ 6" fins). Tail was a crescent....evolutionary step before a swallow tail.

But I've created crescent tails from swallow tails. One time I was surfing so fast that the swallow tail meltd into a crescent and then...........lol

[john -]

Check out hart's double pin - the current photo on the home page or if its changed just click previous - for a kneeboard design this might be similar to the end shape of the cresent boogie boards - strange that i was thinkin "what the..." in terms of the body board idea and then, sure enough, Hart's creative bent seems to legitimise it.

So harty - tell us about the double pin theory!

dorje


ps http://www.ksusa.org./Forum/album_showp ... e=previous

[joe]

... Hart's creative bent ...

[willli]

Lots a rights round sydney?
Asymmagic!!!!

[MTBarrels]

A flex-rail, crescent-tail, shell-type, twin-fin kneeboard (1992-present):



Progressively decreasing rocker becoming flat at the tail:



In a (carving) turn, the rail (but not the centerline) flexes to facilitate turning:

[sf_firestarter]

I like that hart double pin. I had not seen that before but its exactly how I had visualized adapting the crescent tail. My father told me that many of the early boards used the crescent tail. So why no more? Seems like a great design to me. Does the swallow tail provide some performance advantage that a crescent tail would not?

[Beeline2.0]

..

[hart]

Lots a rights round sydney?

I can so hear your NY accent mate..too bloody good!!

Now think (et all) sooo many forehand turns and a really hoooky top turn back.

Simon put this thing under his arm 4 days (?) ago.. I was surprised he picked it up.. (Simon is cautiously conservative as all brilliant surfers are)

He thought that a really long drawn out (forehand) bottomturn could be punctuated by a ballistic (backhand) topturn..in an instant.

Enough said..I thought.

We both, however, deliberated about the 'opposite' scenario.

This board will go well for a Naturalfooter on Right-handers..

Lefts on the other hand..will be another thing all together.

And we weren't thinking of Gomez Addams..

Will report back as soon as Mortisha gets wet



hart

[sf_firestarter]

Beeline, thanks thats exactly the input I was looking for. I want a wide outline with bite, the board is going to be short so I wanted to maximize my surface area. I also thought the crescent would be easier to shape than a fish, but easier is not always better.

Thanks all, I'm sure I'll have some additional design questions before the projet gets underway.

[hart]

sf_

sometimes two 'points' like in a swallowtail are easier to maintain than a curve..(read) crescent when you are working by hand in a soft/porous medium like foam.

look closely and see how i cheated;.

two stringers that converge

two (too) easy



hart

PS

you gotta report back

PPS

mt

pics are awesome