All large amounts of camber are going to induce lots of drag. It's for lift that airplanes change their camber, they have big powerful engines to overcome any drag but not a significant way to increase wing area, they can extend the wing a little bit with Fowler flaps and certain LE flaps, but camber is the big changer on lift. With kites it is possible to increase projected area and camber, but it's you and your board that fights the drag.Bille wrote: When Ya add camber with B and C ; it ain't worth the drag for the return.
80% is the hinge point ; so when you pull on Z at 90 to 100% , your hinge point is
still at C.
Further back than 80% hinge point, will give a higher CL change : but it's at
the expense of More drag. Most flaps on an airplane are at, or near 80% for a reason.
The relation to the % cord that each bridle is attached ,has to
do with the ratio your changing A,B and C with your mixer ; if the ratio doesn't match the % cord
then you get more drag because it introduces wrinkles to the top & bottom surface.
In other words : changing A, B and C with a mixer ,should only affect the AOA, and NOT the camber.
ONLY the Z should affect camber ; and it's best done at 80%.
This is a good point. Using a more stable profile but perhaps lower performance so the depower is more user friendly but gaining back some performance when the bridles are remixed.kitexpert wrote:However it is more beneficial to have increased camber when sheeting in than to have some added drag, so changing camber is used. This allows to use low cambered airfoils, which are stable and make high depower possible because they have low lift.
I think some use of pulleys on leis could be classed as a mixer, mainly thinking about pulleys used on the LE from my memory. I definitely think more bridles will help leis perform better, mainly on the TE as the lack of support there causes them to arc more and lose projected area. The problem with lei designers is they overdo fucking everything. Adding more bridles and attachment points will just compound the problem. First they need to adopt good aerospace engineering and design closer to the minimum needed. Requires restraint and thinking, I doubt some of them have it. Even flysurfer over does things a bit, but the LEI rider looks at a flysurfer kite and can't believe even how lightly constructed they are. The simple problem is if you have a 300kg component like a front line throwing a 2000kg pigtail or bridle line in doesn't make the system suddenly 2000kg.kitexpert wrote:LEI kites don't need speedsystems because they are rigid, they change AoA just pulling backlines. But still, if struts have attachment points for bridles (like Genetrix) even more control for powering/depower is possible. Cost is added complexity and some line drag.
For VMG, I like the second one ; (matching board AND kite) !!foilholio wrote: ...
Thinking about it a bit more you should get the optimum upwind angle while the kite is at it's minimum drag speed.
As to max VMG that is probably matching the board speed to the kites minimum drag speed.
Users browsing this forum: No registered users and 3 guests