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by RalfsB
Wed May 22, 2019 2:02 pm
Forum: Gear Builders
Topic: vacuum ... or something else
Replies: 13
Views: 937

Re: vacuum ... or something else

I found this technique extremely useful, the "poor man's vacuum" series, as in https://vimeo.com/188255088.
I have been using it for laminating boards and also for some smaller custom parts. I am not sure though how well it would work for wings.
by RalfsB
Tue May 21, 2019 8:18 am
Forum: Kitesurfing
Topic: Negative rocker TT?
Replies: 22
Views: 1469

Re: Negative rocker TT?

May be 2 negative rocker areas then, one at the front and one at the back? To even out the maximum lift distribution. Just a thought. A bit like foil with 2 wings? 8 knots riding? In 2 places it might work but I am not sure about how much drag will be there, especially at low speeds. It is not exac...
by RalfsB
Wed May 15, 2019 2:25 pm
Forum: Kitesurfing
Topic: Negative rocker TT?
Replies: 22
Views: 1469

Re: Negative rocker TT?

TT already requires uneven foot pressure, more pressure on the back foot than on the front foot. If you do negative rocker, even more back foot pressure will be needed to compensate for the lift in that part. Sounds like uncomfortable riding.
by RalfsB
Tue Apr 02, 2019 7:50 am
Forum: Foil Kites
Topic: Something new from HQ Kites.
Replies: 10
Views: 1722

Re: Something new from HQ Kites.

But to compare 18m Matrixx by its turning speed to a 18m inflatable does not make much sense. In reality not even 15m Matrixx turns as fast as decent big LEI, hardly 12m Matrixx either. There is many 9m foil kites which turn slower than 17m LEI. I mean, I did not test Matrixx side by side with an 1...
by RalfsB
Mon Apr 01, 2019 6:51 am
Forum: Foil Kites
Topic: Something new from HQ Kites.
Replies: 10
Views: 1722

Re: Something new from HQ Kites.

Maybe this is a bit an off-topic; I was thinking of buying an Empulse but stumbled upon a very good deal on a HQ4 18m Matrixx. Yesterday I tried Matrixx for the first time. I do not have a huge experience with different foil kites but I used 1st generation Ozone Chrono 18m for one season so I have s...
by RalfsB
Sat Mar 30, 2019 10:57 am
Forum: Hydrofoil
Topic: Do you need some rocker at tail of board
Replies: 17
Views: 1480

Re: Do you need some rocker at tail of board

Right now I am riding the Alpine foil with Alpine board (142cm); when I ride the board I think it is pointing up a bit, especially at slower speeds, but it is hard to tell the exact angle when you are riding. I just want to have another universal board that can be used both as a surfboard and as a f...
by RalfsB
Sat Mar 30, 2019 8:38 am
Forum: Hydrofoil
Topic: Do you need some rocker at tail of board
Replies: 17
Views: 1480

Re: Do you need some rocker at tail of board

I suggest you place the board on your foil in your shop and use your eye to see how much you need to compensate for the tail rocker. Look from the side. I'd try to get the fuselage parallel with the area that you will stand on. With the nose up enough to give you 100 mm nose over that fuselage line...
by RalfsB
Fri Mar 29, 2019 5:06 pm
Forum: Hydrofoil
Topic: Do you need some rocker at tail of board
Replies: 17
Views: 1480

Re: Do you need some rocker at tail of board

What I mean by tail rocker is not " tail kick," . It is the rocker from 1/3 up from tail to the tail. The foil is mounted on that curve. "Made a 120cm with 20mm tail rocker works great." I am planning to convert a kite surfboard to a foilboard. The surfboard, of course, has some rocker in the tail ...
by RalfsB
Tue Mar 26, 2019 3:34 pm
Forum: Kitesurfing
Topic: Best 6m for strong Wind freeride/wave
Replies: 15
Views: 867

Re: Best 6m for strong Wind freeride/wave

Check out Naish Slash -- very well-behaved and friendly
by RalfsB
Sun Feb 24, 2019 11:42 pm
Forum: Gear Builders
Topic: Wakeboard DIY build from XPS foam and Fiberglass
Replies: 7
Views: 791

Re: Wakeboard DIY build from XPS foam and Fiberglass

I have built several directional boards from XPS, a very good material; with XPS usually it is suggested to go over the surface with rough sandpaper so that the bond between the layup and the XPS is stronger and there is less risk of delamination. Hard for me to tell about the number of layers; for ...

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