I'll forgive you because you say english is your second language, but trust me I would not be the one laughing if i was you and try to learn english a bit better.kitexpert wrote:WTF? You mean your observation is that 21m kite is bigger (thicker) than say 9m kite? "Absolute thickness"
Again I forgive you because of your english and maybe you don't know what you are typing. But I have explained and proven that this incorrect. Go back and read again what I posted. Feel free to ask me if there is something you are not sure about.kitexpert wrote: higher camber..... are more efficient.
Not at all, if you can read them correctly the links are there and you can see the context. There is a lot more information available too. The real world is also available 24/7 to test any statements or theories.kitexpert wrote: Your examples are "tweaked" ones.
kitexpert wrote: Using flaps is much the same than tightening very much brakes - of course it lowers L/D, it causes huge drag. I have not suggested anything like that, but using higher camber airfoils to get more efficient kites.
Flaps increase camber and are as such "higher camber airfoils". There is a youtube link there showing tests from 1938 of cambered airfoils, well flat plates they call them but they are still airfoils. You can see the actually increase drag created by them. You can not increase lift without drag. Lowest L/D is at low lift though..... There is actually a discussion there that talks about actually lift or glide rate and that is actually better at higher L/D, so low camber, low AoA and higher speeds.
I am not. You are arguing in the face of facts presented to you. I have actually observed these things to be true in the real world from experience. Which is actually where the term expert comes from, the latin experiri or to try. There is things I have tried that you have not and there is also things you have tried which I have not. We can learn from each other.kitexpert wrote: Stop arguing against known facts, foilholio.
kitexpert wrote: Or have a test with some wind tunnel program: take some airfoil and change it's camber. You will see when you increase the camber airfoils efficiency - both L and L/D - will increase.
Sure but is it a high amount of camber? is it at all windspeeds and AoAs? Is the program accurate?
kitexpert wrote: I did quite a lot that kind of study ten years ago
Congratulations, it takes some of us a while and a lot of effort but we can learn. You do know incorrect theories of lift were still being banded around 10 years ago?
kitexpert wrote: and I dare to say I know which airfoils are suitable for kites
I doubt that based on the statements you make. Like why a kite needs not weight less than a certain amount or how higher camber gives better L/D ,etc etc all incorrect. I am sure you are actually a failed kite designer, used to to do work for some brand. Just a guess Like most of the rubbish of past years I bet you are convinced of the benefits of giant tubes and massive luff curves, hence your repeated incorrect assertions about high camber have good L/D. You probably sold the same bullshit to your bosses, well one they woke up to your bullshit and out you go. BYE BYE. But do you know what you can actually be right, you can learn what is actually the correct understanding. you just need not be so arrogant and just be a little humble and think hmm maybe i could be wrong, and lets have a look at it again.
BTW I can see why you hate on Greg so much, the guy has gone against the collective bullshit of you and the likes and without the fancy degrees and years of study come up with a kick arse kite. I think your tea cup is too full.
Of course, square structures are too draggy and flat ones too flexible. One must use curves, such is the natural world and a very pretty one it can be. Smile !kitexpert wrote: Of course they all use cambered airfoils.