knyfe wrote:Ok I started my DYI and based it on:
http://www.seabreeze.com.au/News/Kitesu ... 49403.aspx
Now Of course I didnt use the crazy air profile they recommended for the main foil
- the plan states that one should mount the rear wing upside down to counteract the front wing pitching. Now that sounds fishy to me ... Whats your read?
THNX, G
The given F wing profile would work just fine, but ypur choice is better.
We always use either epp 817 or ep222 or a combination for the R wing as well , but sure a sym will work, and yes upside down!
Never even seen a sym F wing but again it will work, but how well?
They do work well for 3d helis though and needed!
As far as I can see all the factory foils use asym F wings and Almost all use asym R wings as well.
Why not haf the struts width, say 5 cm, and half the thickness, say 6mm instead of using a single strut spec for the 2?
As H said you will have twice the surface area therefore twice the surface friction, and note that airchair Many, MANY years ago gave up on the 2 V strut idea.
But maybe they did not half all the specs like I said, I thought of this as well a few years back, so go for it and let all of us know.
It would seem that a V twin strut could be made lighter, thinner and maybe MUCH stiffer in both twist and flex, as well as hydrodynamically better?
Sometimes an idea that was given up on was a good one only not fully thought out?
A thought about almost sym F wings, the t speer 105 is close and the numbers look great!
H wrote;
I am a believer of symmetrical foil for both front and rear at 0 degree angle.
The reason is at different speed the lift produced by asymmetrical foil will be different.
If you have the front one pitching up and rear pitching down, it just pronounce the Kangaroo effect. Unless you are an experienced racer, able to control the positive lift into higher upwind angle
I am sorry but I disagree with all of that!
R H