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by bohme
Wed Oct 07, 2020 1:06 pm
Forum: Hydrofoil
Topic: Slingshot Phantasm Carbon foil launch - 2020
Replies: 93
Views: 11591

Re: Slingshot Phantasm Carbon foil launch - 2020

TomW wrote:
Tue Oct 06, 2020 9:24 pm
That mast laminate looks messed up. Or is it the image compression?
I think it is very messed up just above G in SLINGSHOT.
The black areas are probably cover ups of messed ups.
by bohme
Wed Sep 09, 2020 10:37 am
Forum: Hydrofoil
Topic: Foil gybe with race kite
Replies: 9
Views: 616

Re: Foil gybe with race kite

I have found that longer lines is more forgiving when practising downloop "race kite" gybes.
Less risky, more drag (line tension), and more time in the powerzone.
by bohme
Wed Aug 26, 2020 10:51 am
Forum: Hydrofoil
Topic: Sailrocket 65 kts/ 75 mph!
Replies: 10
Views: 922

Re: Sailrocket 65 kts/ 75 mph!

Try google "supercavitating foils"
Originally invented for high speed propellers. One of the first to use it was "Turbinia" in 1897...
by bohme
Tue Jun 16, 2020 12:28 pm
Forum: Foil Kites
Topic: Flysurfer is going to beat fishnets? (Release of VMG2)
Replies: 79
Views: 7048

Re: Flysurfer is going to beat fishnets? (Release of VMG2)

There is too much BS in this thread. This was originally about a 2 level bridle made possible by using some FLEXIBLE battens. I will now explain why glass fibre might be a good choice for THIS application: Imagine you have a straight rod batten you want to curve into a closed circle. You can either ...
by bohme
Mon Jun 15, 2020 9:13 am
Forum: Foil Kites
Topic: Flysurfer is going to beat fishnets? (Release of VMG2)
Replies: 79
Views: 7048

Re: Flysurfer is going to beat fishnets? (Release of VMG2)

Bille,
I asked for failure strain, not yield strength. You should only use yield strength for ductile materials (most metals).

I would be genuinely very interested if you know a fibre composite with a compression strain failure higher than S-glass.

Jacob
by bohme
Sun Jun 14, 2020 8:59 pm
Forum: Foil Kites
Topic: Flysurfer is going to beat fishnets? (Release of VMG2)
Replies: 79
Views: 7048

Re: Flysurfer is going to beat fishnets? (Release of VMG2)

Bille,
Fibreglass has a very high failure strain level. Some fibres above 5%.
How can you achieve this by mixing Carbon, with Kevlar, Spectra, or Synthex fibers?
Jacob
by bohme
Fri May 22, 2020 9:43 pm
Forum: Hydrofoil
Topic: renew clear coat for mast
Replies: 7
Views: 727

Re: renew clear coat for mast

My cheapskate approach: Sanding Aerosol primer 1200 grid wet sanding Polyester filler for bigger scratches and pinholes. Sanding Aerosol acrylic paint Wet sanding 800 or 1200 I sometimes clean it with a bit of soap, or light sanding. I guess the best way is a professional 2 part polyurethane clear p...
by bohme
Sat Apr 04, 2020 5:58 pm
Forum: Hydrofoil
Topic: Surf/wave wing thickness and NACA profiles
Replies: 76
Views: 6475

Re: Surf/wave wing thickness and NACA profiles

Designing your own shape is difficult :-) Picking a foil from a databases is easier:
https://m-selig.ae.illinois.edu/ads/coord_database.html.
If you just want to go fast, I suggest you go as thin as you can.
by bohme
Sat Apr 04, 2020 10:30 am
Forum: Foil Kites
Topic: Flysurfer Peak 4
Replies: 1662
Views: 112559

Re: Flysurfer Peak 4

I dropped my 4m Peak4 for the first time yesterday at my wave spot. It happened in a downloop transition, and I foiled a few metres towards the kite. Slack lines... It turned out to be a lot easier and safer to self-resque than I expected. It sits deeper in the water and does not yank you like a LEI...
by bohme
Tue Mar 24, 2020 5:43 pm
Forum: Hydrofoil
Topic: Surf/wave wing thickness and NACA profiles
Replies: 76
Views: 6475

Re: Surf/wave wing thickness and NACA profiles

my latest wing 5% thickness, n-10 profile, ar 3, 600x200mm , ~900cm2 low speed is very good, top speed is good (depends on stab) what is different? feels like wing cutting the water like a knife, very smooth riding in the waves I like this :-) Scaling an n-10 to 5% is not a bad choice. The lower dr...

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