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by rynhardt
Fri May 24, 2019 9:34 am
Forum: Kitesurfing
Topic: Negative rocker TT?
Replies: 22
Views: 1133

Re: Negative rocker TT?

If that is correct, how come you have more pressure on the back foot? I'm not saying it is correct per se :lol: But given my personal experience, knowledge and deductive reasoning I offered an explanation. And within the scope of my explanation, the centre of water pressure (COWP) (red arrow) will ...
by rynhardt
Fri May 24, 2019 7:08 am
Forum: Kitesurfing
Topic: Negative rocker TT?
Replies: 22
Views: 1133

Re: Negative rocker TT?

The lift pressure is dependent on the distance from the spray root, and the angle of attack (Tau in fig 2). Qualitatively, if you have negative rocker in the middle of the board, the angle of attack will decrease for the red area, and increase for the orange/yellow areas. Given that everything else ...
by rynhardt
Wed May 22, 2019 7:39 am
Forum: Kitesurfing
Topic: Negative rocker TT?
Replies: 22
Views: 1133

Re: Negative rocker TT?

If you are comfortable with those assumptions then I can comment, otherwise I can't. :o Go for it. You have got me curious! So.. under fairly steady state conditions, while under kite power, and edging on a typical reach/tack, the waterline under the board looks like the photo below. The board is p...
by rynhardt
Tue May 21, 2019 10:03 am
Forum: Gear Builders
Topic: Covering screw inserts
Replies: 11
Views: 439

Re: Covering screw inserts

The trick is to put a ferrous metal in the insert, and then use a strong rare-earth (neodynium) magnet to find the metal.
The typical magnet tape they sell on places like junksupply are too weak to find easily.
by rynhardt
Tue May 21, 2019 10:00 am
Forum: Gear Builders
Topic: Pneumatics
Replies: 20
Views: 4252

Re: Pneumatics

The I-beam press will allow you to shape the wood and ski building forums have great info on using them. If you resin infuse the laminates you have time to set the dry fabric (spray adhesive works great) and see if the vac is steady before adding resin. Infusion is also great since you can stop at ...
by rynhardt
Tue May 21, 2019 9:55 am
Forum: Hydrofoil
Topic: The Naish Wing-Surfer
Replies: 159
Views: 7298

Re: The Naish Wing-Surfer

Peter_Frank wrote:
Mon May 20, 2019 8:59 pm

I am not impressed in any way I must say, so hope it is thrilling and fun if it is the "thing" :wink:

8) Peter
Yeah I feel the same way about those weird hydrofoil boards :rollgrin:
by rynhardt
Tue May 21, 2019 9:44 am
Forum: Kitesurfing
Topic: Negative rocker TT?
Replies: 22
Views: 1133

Re: Negative rocker TT?

Maybe read up on Savitsky planing hull theory if you are really interested in answers. Any chance you could give some insight or a primer of what to expect as far as the relationship of Savitsky theory's and flat planing hulls engaged at an angle (edged) with relatively continuous rocker and variab...
by rynhardt
Mon May 20, 2019 5:50 pm
Forum: Kitesurfing
Topic: Negative rocker TT?
Replies: 22
Views: 1133

Re: Negative rocker TT?

Maybe read up on Savitsky planing hull theory if you are really interested in answers.
by rynhardt
Wed May 15, 2019 11:00 am
Forum: Kitesurfing
Topic: Negative rocker TT?
Replies: 22
Views: 1133

Re: Negative rocker TT?

Nothing wrong with negative rocker (camber) in the middle of the board. You'll find this happens with very flexible boards by default.
The net effect is the center of lift is moved more towards the rear foot.
by rynhardt
Sun May 12, 2019 1:02 pm
Forum: Gear Builders
Topic: Covering screw inserts
Replies: 11
Views: 439

Re: Covering screw inserts

Drop in a small ball bearing, cover with wax.
You can find the ball bearing with a magnet if you use SS316 inserts.
Drill out the laminate and use the same magnet to remove the ball bearing.

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