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by bohme
Sat Apr 04, 2020 5:58 pm
Forum: Hydrofoil
Topic: Surf/wave wing thickness and NACA profiles
Replies: 76
Views: 5637

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: 901
Views: 64158

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: 5637

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...
by bohme
Tue Feb 18, 2020 10:40 pm
Forum: Foil Kites
Topic: Flysurfer Peak 4
Replies: 901
Views: 64158

Re: Flysurfer Peak 4

I have used a 53cm race bar with 20m lines for my 3-4-5 Peak4's, with SK99 1mm for the rear and 1.6mm for the front lines. Kitefoil only. I am now setting up a new shorter bar around 48cm specifically for my Peaks. 20m lines with 8m extensions. I will keep it simple, and leave out the depower pulley...
by bohme
Thu Jan 02, 2020 8:52 pm
Forum: Hydrofoil
Topic: Surf/wave wing thickness and NACA profiles
Replies: 76
Views: 5637

Re: Surf/wave wing thickness and NACA profiles

I'm 12hrs + get. So the next question is this this should the naca profile on the rear be the same as the front? Or should I look at a different profile? The front wing operates, from take off to max speed, between stall (cl more than 1.0 or aoa 10°) and cl = 0.25. The rear wing operates, from take...
by bohme
Mon Dec 30, 2019 6:39 pm
Forum: Hydrofoil
Topic: Surf/wave wing thickness and NACA profiles
Replies: 76
Views: 5637

Re: Surf/wave wing thickness and NACA profiles

Why e387? The e387 has a lot of camber and a very high sweet spot Cl around 0.7 (around 10kn of foil speed) My guess is it get unstable above 18kn (Cl below 0.4). A NACA 4 series might be a better choice. I used 387 as it was a recommendation on another site. I'm open to change however. Hmmm, think...
by bohme
Sun Dec 29, 2019 9:19 pm
Forum: Hydrofoil
Topic: Surf/wave wing thickness and NACA profiles
Replies: 76
Views: 5637

Re: Surf/wave wing thickness and NACA profiles

Why e387?
The e387 has a lot of camber and a very high sweet spot Cl around 0.7 (around 10kn of foil speed)
My guess is it get unstable above 18kn (Cl below 0.4).
A NACA 4 series might be a better choice.
by bohme
Wed Nov 20, 2019 1:13 pm
Forum: Foil Kites
Topic: 80 knots on a foilkite
Replies: 12
Views: 1425

Re: 80 knots on a foilkite

Wow. 76kn on a switchblade. Apparently, the stern-steerer ice yacht Debutaunte was timed over a measured mile at 124 knots on the ice of Lake Winnebago in 1938. I guess you do not need high efficiency. You might even consider the complete opposite. If you want to do 80kn, dig a trench and go out i 1...
by bohme
Thu Oct 24, 2019 10:55 am
Forum: Hydrofoil
Topic: The longest non-stop leg
Replies: 4
Views: 525

Re: The longest non-stop leg

Impressive. Maybe a bit crazy :-) What stops me from doing this is safety. I have been en trouble once because of fatigue and and a long swim. I often foil solo, and bring my mobile in an aqua-pack and some glow sticks. You can now call 112 with gps coordinates (country dependent). What is the next ...
by bohme
Fri Oct 11, 2019 10:42 am
Forum: Foil Kites
Topic: Flysurfer Peak 4
Replies: 901
Views: 64158

Re: Flysurfer Peak 4

I have tried line length 14m, 17m, 28m on a Peak4 4m2. 17m is the sweet spot for me, but I still prefer 28m lines to my old 9m LEI. With 28m lines I waterstart using a big powerstroke. With 17m lines I sometimes have to use "flat figure 8" to keep the kite in the powerzone for longer. I do not mind ...

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