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by Kevin Brooker
Wed Dec 13, 2017 1:26 am
Forum: Hydrofoil
Topic: How to turn a hydrofoil - and what is YAW ?
Replies: 70
Views: 4203

Re: How to turn a hydrofoil - and what is YAW ?

Joyrider1. I missed the surfing part and readout as w/ kite. I'll concede the act of trying to imitate a turn by trying to impart yaw is correct but pure yaw will not turn.

Mitaka had a much clearer explaination then mine and thanks.
by Kevin Brooker
Tue Dec 12, 2017 9:21 pm
Forum: Hydrofoil
Topic: How to turn a hydrofoil - and what is YAW ?
Replies: 70
Views: 4203

Re: How to turn a hydrofoil - and what is YAW ?

We impart yaw by pulling against the kite. If we just twist the yaw will be imparted until we try to realign ourselves ( untwist) when it will return to the pre twist state. This is what happens to the astronaut. On a surfboard we twist and roll the board which now tries to move under us giving us b...
by Kevin Brooker
Tue Dec 12, 2017 7:01 pm
Forum: Hydrofoil
Topic: How to turn a hydrofoil - and what is YAW ?
Replies: 70
Views: 4203

Re: How to turn a hydrofoil - and what is YAW ?

From the aero guy: positive stability is when a craft is displaced and returns to the original pre-displaced orientation. Neutral stability is the craft remains in the new displaced orientation. Negative stability ( unstable) is when the displacement amplifies itself. The stability definitions can b...
by Kevin Brooker
Tue Dec 12, 2017 12:50 pm
Forum: Hydrofoil
Topic: How to turn a hydrofoil - and what is YAW ?
Replies: 70
Views: 4203

Re: How to turn a hydrofoil - and what is YAW ?

With dihedral in the wing, instigating a yaw vector will cause differential lift from the change in AoA of each panel. This will cause the entire setup to roll thus changing the lift vector to turn the craft. When adding rudder only to an aircraft the dihedral does the same thing. Keeping the wings ...
by Kevin Brooker
Sat Dec 09, 2017 1:37 pm
Forum: Safety
Topic: Q: How to make my 2002 kite "safe"?
Replies: 17
Views: 7905

Re: Q: How to make my 2002 kite "safe"?

My quiver is almost a history of kite development. Back in the 90s we used two line stunt kites (flexi foil stacks, Hawaiian Team kites) to skate when the lakes froze. No depowering and relaunching was s process. The ride was basically a broad teach as the kites didn't work too well for going upwind...
by Kevin Brooker
Fri Dec 08, 2017 3:33 pm
Forum: Hydrofoil
Topic: hydrofoil at max speed limit
Replies: 63
Views: 3779

Re: hydrofoil at max speed limit

The drag created by the non-lift generating parts (lines,rider, anything but the wing) will kill the L/D at a rate greater than the development of pure lift. Generating power will not be the limiting factor. we seem to agree the limit will be the strength of the rider.
by Kevin Brooker
Fri Dec 08, 2017 1:38 pm
Forum: Hydrofoil
Topic: hydrofoil at max speed limit
Replies: 63
Views: 3779

Re: hydrofoil at max speed limit

The L/D goes down as speed goes up. A max of 10 (as in the example) is at best glide. Go faster and the drag goes up as the square of the speed. The formula holds for the foil too. The limit is a lot closer than we realize and is most likely governed by the limit of the rider than equipment.
by Kevin Brooker
Sat Dec 02, 2017 1:24 pm
Forum: Snow / Land
Topic: cross country bindings for snow kite skiing?
Replies: 3
Views: 415

Re: cross country bindings for snow kite skiing?

Ski gear matters for your fun and safety. I use tele gear which makes it easier to move around in the finicky winds of New England. There are not many fields near where I live so lakes are the prime riding area. When kite skiing you are essentially turning (skis on edge)the entire time. Too light of...
by Kevin Brooker
Fri Nov 17, 2017 1:28 pm
Forum: Hydrofoil Builders
Topic: Dihedral stabilizers
Replies: 12
Views: 1069

Re: Dihedral stabilizers

Distance from the CE does matter. The same force ten time the distance has a ten fold effect. It is just a lever. Move the stab farther away and it can be smaller and have less angle of incidence which should reduce drag. The compromise is the fuse needs to be stiffer which adds weight and length ad...
by Kevin Brooker
Thu Nov 16, 2017 1:37 pm
Forum: Hydrofoil Builders
Topic: Dihedral stabilizers
Replies: 12
Views: 1069

Re: Dihedral stabilizers

Trying to follow this thread but the terminology is being used in a way I am unfamiliar with. My background with foils and flight is with models and full sized aircraft. Most of the models are 1.5 meter span dicus launched gliders wherevyou hold the model by a wing tip and spin to generate speed and...

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