NICE JOB! rider 5

> 10 years ago
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jord070
jord070
WA
1109 posts
WA, 1109 posts
2 Mar 2008 12:53pm
only one thing that i would have doen differently with your new twinny is make it a convertible, i dono if alberto showed you his custom, with center finbox still is it so it could be wither twinnie or single, but still very nice, have to let us know how it goes on the water now.

KeepSailing
Jordan
jord070
jord070
WA
1109 posts
WA, 1109 posts
2 Mar 2008 1:05pm
Rider5
Rider5
WA
567 posts
WA, 567 posts
2 Mar 2008 2:57pm
Thanks Jordo,
I though about keeping the single in, but it would add 1/2 a kilo to the weight of the board. Plus I like to take chances and commit I already knew what it was like as a single fin. I also adjusted the bottom shape/contour a bit to work better with twins before I did the conversion.
hoop
hoop
1979 posts
1979 posts
2 Mar 2008 3:42pm
Is that you Blue Juice? Have you changed the name of your boards now?
curac
curac
WA
1160 posts
WA, 1160 posts
2 Mar 2008 3:43pm
what type of board was it before..

and how does the twinie go?

i would have thought there would not have been to much point unless you have the right board shape to accompany the fins
jord070
jord070
WA
1109 posts
WA, 1109 posts
2 Mar 2008 3:53pm
was it one of your customs?
Greenroom
Greenroom
WA
7608 posts
WA, 7608 posts
2 Mar 2008 10:51pm
Come on Twin King spill the beans! How did the flame board go with the twin set up? Can I try it tomorrow?
pweedas
pweedas
WA
4642 posts
WA, 4642 posts
3 Mar 2008 12:11am
jord070 said...




Just looking, I think it might work better with the fins further apart.
The closer they are together, the more they are pushing on the same water stream, i.e. they interfere with each others slipsteam.
This will make them more prone to sliding out.

Fins work very much like plane wings and back in the days of biplanes it was found that the best lift was obtained when the wings were further apart, thus they made them as far apart as possible within the constraints of still fitting them on the aeroplane.
Just my thoughts.
555
555
892 posts
555 555
892 posts
3 Mar 2008 7:54am
pweedas.. your comment about biplanes sparked another thought which may or may not prove useful.

Some of the old school biplanes had the top wing slightly further forward of the lower wing to counter some of the wake turbulence interaction. I wonder whether the same theory would have a positive effect on a twin fin board. You'd have the windward fin forward of the leeward one, and you'd want to move both by the same distance so that they'd remain balanced about the centre of pressure. It could make things unusually interesting if you managed to spin out one fin though..

Sounds like a worthy experiment to me - a screwdriver, and some consistent conditions are all you'd need.
Rider5
Rider5
WA
567 posts
WA, 567 posts
3 Mar 2008 2:26pm
Lano good swell, wind, board is super loose
Yes Hoop it's me I'm so so so bored with the other name.
It was one of my single fins.
Curac yes there was much of a point for me( I have been useing a twin fin as a light wind board for the last 7 years), I adjusted the bottom shape heaps before turning it into a twin fin, Twin fins give a different feel on the wave that I like, the turns are tighter, the board has more control when the wind picks up and I point higher putting me in a better position to get a wave.
Pweedas if I put them further apart the fins get to close to the rail which means they can then suck air down the fin and cavitate these are 12 cm apart, I've done them in the past 8cm apart and on a wide tailed board 14cm, cant say I noticed too much of a difference.
The toe in angle, size of fins to sail area and bottom shape of the board seem to have more of an effect on spin out.
555 I have been down that path taken screw driver down the beach for the afternoon and have tried them in so many different combinations of positions and sailed them alongside a mate to see how it affected speed and upwind and bottom and top turning and after all that! the conclusion I came up with is to have them both in the same position. If I have the correct size well foiled fins and angle and bottom shape, they just dont cavitate, if say the fins are too small then it is always the windward one that cavitates first I see the messy trial of water comming of that fin.
Yes you may greenroom but I'm putting in the older fins don't want you trashing my new fins.
Mr. No-one
Mr. No-one
WA
921 posts
WA, 921 posts
3 Mar 2008 3:16pm
Hmmmm, where did I put that router?
Rider5
Rider5
WA
567 posts
WA, 567 posts
3 Mar 2008 3:27pm
Long drive for you Mr No one I was quite surprised to see you up there. Did you head over to main break there were some nice lumps coming through there.
Mr. No-one
Mr. No-one
WA
921 posts
WA, 921 posts
3 Mar 2008 3:43pm
I did , got a couple of size waves but the wind died so sailed back to south passage.
Was hoping for a Scarbs session today but...................
So was the twin conversion worth while? Got to go, the phones ringing.

It's ok, it was just you.
Rider5
Rider5
WA
567 posts
WA, 567 posts
3 Mar 2008 4:11pm
yeah your funny
Greenroom
Greenroom
WA
7608 posts
WA, 7608 posts
4 Mar 2008 12:25am
Funny haha or just funny?
Rider5
Rider5
WA
567 posts
WA, 567 posts
4 Mar 2008 12:47pm
Both
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