dr max Sorry, mate, a bit late... The event was 3 weeks ago. We will try to organize some more events end of this year. :O

New Forum? Plus some Technical Stuff
 

This subject could be the basis for a new forum. Certainly, there is obviously a lot of interest in the subject.

Back to the subject. I have designed an aerobatic model with a very thick symetrical aerofoil section, with a very rounded leading edge, very light, under three pounds with a wing area of 720 sq in, (48 in x 15 in), with an OS25 powering it. It flies with very little speed differential in all attitudes, since drag builds up as it flies faster. It performs very well.

It has lead me to think- just how thick, and how blunt a leading edge could an aerofoil section be, before it's not capable of lift??

A friend of mine constructed a 3-D aeroplane. It looks a bit like the Modeltech Magic, but it is bigger (64 inch wingspan). When I saw the wing, I thought it would never fly: a very roundish leading edge, I would estimate about 5 inches (!!!!!) and then the upper and lower airfoil going straight back to the trailing edge, fully symetrical.

I think he used one of these tubes, which FedEx, UPS, or DHL are using, to shape his leading edge.

The model (I call it IKEA-Magic, :p) is powerd by a Saito 72, 4-stroke) is the proof, that what we learn in aerodynamics is all wrong... :} It lifts off after 5 feet groundrun and does all kind of wild 3-D stuff.

Hi all RCers,

I fancy trying to build one of these :

http://www.angelfire.com/blues/heli_project/

for a laugh. I only want to buy the rotors (can't really be bothered with trying to build a matched pair), the only thing I can see difficulty with is the swash plate.

The chap has a diagram on his website on how he built his, but its not very clear, and any search on the Internet on how a swash plate works, and is constructed didn't reveal very much. Is there anyone out there who has information like this - it would be good to try and build one as it would seem to be the most technical part of the project (the tail rotor is controlled by a separate motor).

Any help would be greatly appreciated.

Cheers


(P.S. if I've hijacked the thread, sorry.....:O )