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by fluidity
Fri Oct 09, 2020 11:12 am
Forum: Gear Builders
Topic: An object in a fluid
Replies: 25
Views: 2814

Re: An object in a fluid

Ok, answering my own question: https://openfoam.org/ (the engine) https://sim-flow.com/ (the cockpit to drive it) Just ordered the first parts for a CNC table I'll build soon. Steppersonline for my stepper motors, drivers, interface board and water cooled spindlemotor. Robotdig for splined pulleys,...
by fluidity
Fri Oct 09, 2020 10:56 am
Forum: Foil Kites
Topic: Weird sensation boosting
Replies: 8
Views: 561

Re: Weird sensation boosting

Hey all, Last few times I was out on a 15m soul with 20 to 25 knt wind, when I boosted next to side of the reservoir and a cliff side I felt like i was not moving down wind, I felt like I was going upwind like on a glide on snow in the mountains. I was kiting in a narrow reservoir with mostly therm...
by fluidity
Sat Oct 03, 2020 9:16 pm
Forum: Wingsurfing
Topic: Off shore winds, yes or no?
Replies: 20
Views: 967

Re: Off shore winds, yes or no?

It sure looks nice in this video: https://www.youtube.com/watch?v=3p6g9_arpsU But seriously though, it's all up to the rider and I think it's pretty much the same for kiting or winging, with the one main difference being that considering offshore wind will be gusty you might have an easier time wit...
by fluidity
Sat Oct 03, 2020 8:55 pm
Forum: Gear Builders
Topic: Wing profile info for backyard hydrofoil builders
Replies: 68
Views: 3501

Re: Wing profile info for backyard hydrofoil builders

Hi, seeing the graphs first thing that shot through my mind was that it prooved what I read before, that plane surffaces on a wing are super ineffciant.I always wondered if that flat surf fins are just because fo the cheapness of shaper and industry ...anyway. What stroke me, too, is how close the ...
by fluidity
Fri Oct 02, 2020 10:08 am
Forum: Gear Builders
Topic: Open Fuse
Replies: 39
Views: 1966

Front wing offset angle?

For my first wings/fuselage combo I set the front wing flat. I ended up using a -3 degree angle on the rear wing to provide very mild pitching up of the bow of the board. So then I designed my second wing with a built in 3 degree angle of attack to put it in the right starting region and also to nes...
by fluidity
Fri Oct 02, 2020 9:53 am
Forum: Gear Builders
Topic: Wing profile info for backyard hydrofoil builders
Replies: 68
Views: 3501

Re: Wing profile info for backyard hydrofoil builders

<cut> Even with this fabrication technique, I thin it is possible to do it with any profile. When making the wood templates, one just needs to include a little stand on the trailing edge, to set the angle of attack, so that the template will stand on a flat surface with the correct AOA. Simple sket...
by fluidity
Thu Oct 01, 2020 8:56 am
Forum: Wingsurfing
Topic: Wing Boards: Fanatic vs Fone vs Naish vs Custom Carbon
Replies: 11
Views: 1021

Re: Wing Boards: Fanatic VS Fone VS Naish VS Custom Carbon

@joekitetime - Thanks for the detailed and informative review. May I ask regarding the durability of the boards : Do the F-one boards ding from falling onto them on the water - for example do you expect that knees and elbows will cause dings? Any dinging on my F-one rocket air bounces right back ou...
by fluidity
Thu Oct 01, 2020 8:41 am
Forum: Gear Builders
Topic: Pumping foil section/airfoil?
Replies: 5
Views: 668

Re: Pumping foil section/airfoil?

It seems there is some dispute over the differential flow theory. Angle of attack and displacement are larger factors. I almost clicked on that video in another list on youtube last night. It does do a nice quick summary of the history and thoughts on hydrofoils. Airfoils are designed differently f...
by fluidity
Wed Sep 30, 2020 9:04 am
Forum: Kitesurfing
Topic: Who uses a cnc for their builds
Replies: 30
Views: 1375

Re: Who uses a cnc for their builds

Hey Graham, good to hear it´s working now! 18 hours milling sounds like a challenge. What I sometimes do with big milling projects is splitting them into several operations, for example "3D-milling surface", "outline" and so on. Another hint for long lasting milling: Have always a look on the G-cod...

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