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The SUP style of foiling
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dllee



Joined: 03 Jul 2009
Posts: 3856
Location: East Bay

PostPosted: Thu Mar 22, 2018 11:42 am    Post subject: Reply with quote

Go for it! Remember to use a rope leash from rear strap to loop around the vertical fin/mast to retain your foil after it rips out. I use 2mm Spectra.
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grantmac017



Joined: 04 Aug 2016
Posts: 487

PostPosted: Thu Mar 22, 2018 12:22 pm    Post subject: Reply with quote

There is no way you will get the center of gravity anywhere near the center of lift without a fuselage and rear wing.
But have fun replacing your fin box.
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dllee



Joined: 03 Jul 2009
Posts: 3856
Location: East Bay

PostPosted: Thu Mar 22, 2018 1:56 pm    Post subject: Reply with quote

Like riding a Bongo board.
That's why FRP's use the tail of the board for trim control.
Let's re invent the wheel.
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coachg



Joined: 10 Sep 2000
Posts: 2586

PostPosted: Fri Mar 23, 2018 8:35 am    Post subject: Reply with quote

dllee wrote:
Go for it! Remember to use a rope leash from rear strap to loop around the vertical fin/mast to retain your foil after it rips out. I use 2mm Spectra.

Thanks for posting. I had totally forgot about that. I remember when Anders first started foiling out of Berkeley about 4 years ago he told me that they were hitting fish because the fish couldn't hear them coming so he had the same leash system on his foil.

Coachg
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dllee



Joined: 03 Jul 2009
Posts: 3856
Location: East Bay

PostPosted: Fri Mar 23, 2018 12:33 pm    Post subject: Reply with quote

In the fall, those7 foilers hit more than 3 fish a day, sometimes big ones..like rays and shark.
But watch for half sunken driftwood the most.
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ittiandro



Joined: 22 Nov 2009
Posts: 238

PostPosted: Sat Mar 24, 2018 11:10 am    Post subject: Reply with quote

Does the length of the wing's mast increase the forces ( torsional or other) on the fin box ?

I'd be inclined to think so, especially with those slender, almost 1 m long masts you see around. I believe they are likely to sway the longer the mast, but I am not too sure.

Perhaps by attaching my full D.I.Y contraption ( front and rear wing) directly on a 36 cm fin as a mast, I can reduce the stress on the US fin box to a safe level.
All I risk is may be that I have no lift off or that the board drifts downwind , because the fin is too short, as somebody suggested in this Forum, but it is better than breaking anything, as U2U2U2ís maths quite convincingly indicated.

There must be also a relationship between the wing's surface and the stress forces on the fin and fin box, in addition to the forces on the sail, isn't it ?

Also, I see that people bolt reinforcing plates around the fin box. I am sure they work, but I can't see how , because , from what I know, underneath the hard shell of the board there is soft foam or other similar material.
Thanks for your comments, as usual

Ittiandro
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