Hi Arch,
Interesting alright !
How far forward as % of MAC.
Also where is section highpoint as % of MAC .
How does it 'hold' for spins especially if little or no headwind.
I will try this off season, need something to help roll back the years.

Brian

Well since the plane in question is here on my wall for repairs, I think I can answer for Arch....

CG is right between 29-30% MAC right now. After checking mine is about 31%, and needs to go forward just a hair.

Highpoint is 32.5%. Much further back and the plane "hunts" some but does a very violent snap. High point much farther forward and the plane locks fantastic but the snaps suffer a bit without playing with the CG and messing up the whole thing. Balance....and feel.

Spins: stops dead and drops like a rock.....a gentle rock. There is video out there of both mine and Arch's spins at Com Air, but the video quality isn't all that great. just a spur of the moment hand held camcorder thingy. I can post a link if you want. There are no clouds and zero wind so, you have to watch it a couple of times to be critical.

If you find the answer to rolling back years let me know! LOL

Oh to address what Vince said about the incidence; wing thickness plays a large part here. Thinner wings are more efficient and therefore are much more sensitive to incidence than thicker wings. Each airfoil has an optimal AOA at a given speed, and the AOA is diferent for different airfoils and thicknesses. You have to find the one that works best for your particular wing, CG, and plane in general. But the +.5 is a great place to start. You may end up at less than +.25 or greater than +1 depending on the rest of the variables. All planes are not crated equal. in fact after trimming like crazy and being very critical, the wing incidence on both mine and Arch's VF3s are actually at +.4, slightly less than a full +.5 and the plane seems to like it there. I've had mine all the way to +.75 when I had the CG way forward, but the plane felt a little mushy to me around center and rolled wierd. But WOW did it track lines!!!! To this day I have never flown anything that tracked better, wind was just not a factor at all. But the plane felt like it was "plowing" if that makes any sense, and there's no other way to put it. And again that's a personal feel thing, not anything really tangible.

-Mike

Hi Mike,
Thanks for that.
I think your high point is forward 'ish,which I think is good.
I believe CG and centre of lift relate but that stuff is not my forte.
I will check some wings here ,just to see.
I will do some proper tests come springtime.
Clock's go back here tonight ,dark tomorrow at 5pm, so good weather Sundays only from now until March.

Brian

Thanks Mike....since my location and distance from the plane prevented me from measuring it..I was hoping you'd chime in with exactly where it was....

Arch

LOL No prob, I'm in mad scientist mode

-M

That can be a good thing...