dubd

This may sound like a silly question, but I'd rather be safe than sorry. Can someone tell me which arrow is pointing to the leading edge on the AT-6. I ask because I am not sure if the area that the red arrow is pointing to is considered the wing.

The manual states CoG is 3.5" from leading edge. If measured from the red arrow the tail falls to the ground. When measured from the green arrow, the plane balances. I am using the recommended equipment and location, so there should not be such a huge deviation.

Thanks!

BankYank

My Feedback: (63)

Looks like your looking for a cog point? If so i would go from the red arrow next to the fuse unless the directions say otherwise.
Pat

drone pilot

I balanced my VQ T-6 using the measurements from next to the fuse (red arrow) seems to work for me. Most cases the measurement for the CoG is given at the point where the wing meets the fuse. You might try flying with the balance at the green arrow and see how it handles, or at the red arrow, then adjust to your liking......... There isn't that much difference tween the two, at least not on mine...

Hogrider

My Feedback: (392)

riotgear,

The RED arrow is pointing at the "Wheel Housing", which is part of the wing, and the Green Arrow is pointing at the "Leading Edge" of the wing.

dubd

Hogrider, that is exactly what I have been trying to get clarification on. I've was told by others that the leading edge starts at the wheel housing, which why I started this thread.

NickC5FE

My Feedback: (31)

If it is a flying surface(part of the airfoil), as the wheel housin is on the t-6....it is calculated in the cg measurements. go with the red line.

drone pilot

If you take the wing off, then lay a straight edge along the leading edge to the front center, I think you will find the front of the wheel well close to that line. Any help?

LDM

My Feedback: (15)

Interesting conparison see Top Flite Plans on line for there seafury .

dubd

I talked to a tech at Hobby Lobby today and he said balance from the green arrow. This is amusing.

LDM

My Feedback: (15)

That would be what the Top Flight plans say on the seafury , balance from the leading edge of the wing ---less the plastic fairing ... , the seafury has almost the same outline as the AT-6 , ok scale buffs dont go crazy with that statment , but the wing from top view on one side is almost identical in the front .

drone pilot

I wonder what the dimensions of the two planes are. Is the wing chord the same?, the distance from the CoG point to the nose and tail? These would seem to me more important than where they tell you to measure on the wing. Or do we figure the MAC and put the CoG at a percentage of that regardless of the other measurements? Top flight might say 28 percent at thier given point and the other plane 30 percent at thier given point.

dubd

Well I flew the AT-6 with the CG 3.5" from the green arrow and it flew great. In fact, it was a tad nose heavy.

Hogrider

My Feedback: (392)

An air foil has a top and a bottom surface.
The Wheelwell has only a top surface and a rather large cavity for the bottom surface;
not very conducive for lift.

drone pilot

Does your statment hold true when the wheels are in the retract position?

Hogrider

My Feedback: (392)

Yes. The wheels are not part of the airfoil because they do not contribute to the function of the airfoil. They only help in filling the cavity of the wheel well during flight. When landing or taking off, the wheel well is working as a handicap to the lift at slow speed, when you need all the lift you can get. It is this cavity, with or without the wheel, that interfers with the flow of air. The wells are taking up valuable real estate when taking off and landing and causing an abundance of turbulence at this time.

wb2fka

That's an ARF model of the North American AT-6 Harvard, not the Texan. Graupner labeled it the Havard. they must have a German to English interpreter from Boston.

Hogrider

My Feedback: (392)

The North American AT-6 is called by the U.S. Army Air Corps. the "Texan" (common name),
the U.S. Navy labeled it the "SNJ" and Great Britain called it the "Harvard."
So it depends who owns this Reno air race plane as to what it is labeled.
Apparently, this AT-6 is own by Great Britain, thus the name "Harvard."
It does not make any difference who owns the AT-6, it is still a North American AT-6 product.