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the "Malabar" mixer test for large foilkites in light wind

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foilholio
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Re: the "Malabar" mixer test for large foilkites in light wi

Postby foilholio » Fri Jan 29, 2016 8:13 am

I tried fixed BC, B becomes slack with C still tensioned when depowering. Turning seems slower and less responsive than BC on a pulley. Even powered the pulley will distribute tension more even than fixed.

I have another idea.
10.jpg
10.jpg (18.54 KiB) Viewed 691 times
Should increase C movement powered and reduce B? Technically B should hold half the tension of C, the actual lengths will be interesting.

I could obviously add more pulleys to the C section and increase the tension on it further. I wonder if this could create a similar effect to a 631 or higher mixer, but with a short throw.

kitexpert
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Re: the "Malabar" mixer test for large foilkites in light wi

Postby kitexpert » Fri Jan 29, 2016 6:26 pm

Interesting thread, thanks for Regis, foilholio and Kiter_from_Germany. Like KfG wrote, modern kites are designed for 1:1/2:1/4 speedsystem, only in biggest sizes more efficient systems may be needed or are possible.

Regis's Malabar is reasonable invention. Too bad if it does not relaunch. It could have been too efficient anyway.

KfG's "conventional B" looks good too and has original idea. It may be too efficient, but adding a pulley to get 1:3 instead of 1:2 to B-C, would help. Then pulling ratios would be: 4/3:2/3:1/3, for Z:C:B, if I calculated correctly (modified to normal system with fixed A).

Looks good, a bit more AoA change than normal system allows. Drawback is additional pulley. Original camber change is controlled and stays the same. This deserves testing, foilholio? :)

Number10 is foilholios idea in which B-C adjust automatically. I don't know if it is a good idea, because change of camber is not controlled like it normally is. If I see it correctly, added orange pulleyline should be doubled on B side, not C? But I'm not sure of that...

foilholio
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Re: the "Malabar" mixer test for large foilkites in light wi

Postby foilholio » Sat Jan 30, 2016 12:08 am

Looks good? which one? conventional_B? That will just lock ABC together and the kite probably wont even fly. It'll be permanently in a stall.

Number 10, yes you could think that the extra pulley needs to be on B. You need to think about it a bit. It's B and C that move each other. B has more leverage on C with the extra pulley.

Number 9 worked quite well. The reduction in weight on this style of mixer should be enough for maybe 6 extra pulleys. The two main pulleys could be replaced with one ring.If it turns out a tripling or quadrupling of force on C is best, even lightweight multi sheaved pulleys could be designed and used. I wish someone would improve upon the current plastic pulleys, they seem to have a bit of waste in them. 3 grams should be achievable. They are designed for 4mm ropes and we use 2mm.

foilholio
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Re: the "Malabar" mixer test for large foilkites in light wi

Postby foilholio » Sat Jan 30, 2016 2:11 am

Very limited test of 10. Works as it should. The effect seems greater than 421 maybe more 841. I don't think more pulleys will be needed. The reduced tension on b is really quite noticeable. Seems to highlight flaws in existing bridle design with some parts becoming very slack. Otherwise the profile looks good with this mixer. Will need to test more with it.

One thing I have to do is install a line to restrain B depowered. The kite I am using needs AB to depower with enough stability. I see the potential to actually restrain B and C depowered with this style of mixer,on such kites, and not need a line to do it. There may be a possible reduction in C pulley line available as such. Only reason stopping it would be being able to still relaunch.

foilholio
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Re: the "Malabar" mixer test for large foilkites in light wind

Postby foilholio » Thu Mar 17, 2016 7:08 am

I tested 9 and 10 more trying to see if I could get them to hold BC depowered in such a way as the kite would be stable. Unfortunately it seems impossible. It seems with some tension alone on AB foils can depower but hold good stability, but as soon as C is introduced it all goes out the window. I think for kites that depower solely on A this could still work. I still need to test a line restraining B depowered.


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