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by rynhardt
Wed Jan 17, 2018 2:00 pm
Forum: Kitesurfing
Topic: Cape Town Visitors - Avoid killing each other
Replies: 7
Views: 348

Re: Cape Town Visitors - Avoid killing each other

I wonder why signs would be needed? These are basic rules in our sport! Everyone should know them and act accordingly. I very much know not all know and do, riding on Brazilian lagoons...the question now is why don’t they know??? Kite schools and instructors can/should be held responsible? The thin...
by rynhardt
Wed Jan 17, 2018 12:46 pm
Forum: Kitesurfing
Topic: Cape Town Visitors - Avoid killing each other
Replies: 7
Views: 348

Re: Cape Town Visitors - Avoid killing each other

From the perspective a being a regular tourist to Cape Town. It's great that the locals have established a set of guidelines that work for them. However, unless it is signposted somewhere visible, it's unlikely that visitors will be aware of these. Posting on the internet forums is a good start, but...
by rynhardt
Mon Jan 15, 2018 10:34 pm
Forum: Kitesurfing
Topic: Bar sheeting travel / kite's angle of attack.
Replies: 4
Views: 329

Re: Bar sheeting travel / kite's angle of attack.

Hi, I have recently been told that the Ocean Rodeo Stickshift bar has 115 cm of bar sheeting travel if the adjustable stopper is set at the very top (which seems HUGE to me). My question is: How long can a bar's sheeting travel be without messing with the kite's angle of attack? Tks Depends on the ...
by rynhardt
Mon Jan 15, 2018 10:17 pm
Forum: Board Builders
Topic: Forces on a twintip
Replies: 9
Views: 445

Re: Forces on a twintip

I decided to do a step-wise approximation for the non-uniform (savitsky) load case. Did a quick graph in Excel to get the approximate shape, then applied the loads in 10cm bands down the length of the board. End result is as expected, with a fairly large downwards deformation at the stagnation (hing...
by rynhardt
Mon Jan 15, 2018 8:11 pm
Forum: Board Builders
Topic: Forces on a twintip
Replies: 9
Views: 445

Re: Forces on a twintip

This is a plain board ride against the water, not edging. Not sure what is this proving when we just do not ride a TT that way 99% of time. Thoughts? D. Well sure. But I have to start somewhere. It's easier for me to understand one scenario at a time, and I simply picked the easiest one to start wi...
by rynhardt
Mon Jan 15, 2018 8:08 pm
Forum: Board Builders
Topic: Forces on a twintip
Replies: 9
Views: 445

Re: Forces on a twintip

Dusted off some of my FEA skills and modeled a 1400x400 board with slightly tapered tips, flat (no rocker). I used a uniform load of 1500N/m2 on the board. First pic is the top view with colour coded deformation scale. I did 3 scenarios for feet placed: 400 apart: camber (negative rocker) is almost ...
by rynhardt
Mon Jan 15, 2018 9:33 am
Forum: Board Builders
Topic: Custom Kiteboard Full Carbon
Replies: 20
Views: 1118

Re: Custom Kiteboard Full Carbon

The one that I am now finishing has two strips on top with glass and carbon with glass under. She is quite thin in the middle and really I have to add probable more heavy glass. The two carbo strips on the top with glass ...makine her flexy and strong. For sure the best would be to able to cut the ...
by rynhardt
Mon Jan 15, 2018 9:01 am
Forum: Board Builders
Topic: Custom Kiteboard Full Carbon
Replies: 20
Views: 1118

Re: Custom Kiteboard Full Carbon

"Fibreglass twintips that have too much flex bend to much and produce a negative rocker line between the footstraps." The stiffer the board in the middle, the less possible to produce a negative rocker. But, I push my back foot heel and lift my front foot toes when riding, lets say this is a torsio...
by rynhardt
Sun Jan 14, 2018 10:39 am
Forum: Board Builders
Topic: Forces on a twintip
Replies: 9
Views: 445

Re: Forces on a twintip

downunder wrote:
Sat Jan 13, 2018 4:48 pm
Have a play in here:
https://webstructural.com/beam-designer.html

Instead of steel, we might use a carbon modulos on top/ bottom of wood beam:)

Let us know :)
D.
Thanks. I might just do that for the hell of it :-)

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