MAC for 3d

[tomatocan]

What MAC are you finding to be the most useful for 3d flying? I'm at about 35% right now, and it still seems like I'm nose heavy. Still requires more down elevator than I like inverted, and harriers are just now starting to come in without much wing rock.

[bob_nj]

What plane are you flying?
Are you carrying any up trim in the elevators when upright?

[tomatocan]

I'm flying a Great Planes Reactor. I'm trimmed for level flight at about half throttle cruise. The elevators are pretty flat. I just flew a scratch built giant scale profile that was fairly tail heavy (42% MAC), and that was too much....so I'm guessing somewhere around 37-38% might be just about right. I like to fly my indoor stuff so it requires just a very lite touch of down elevator when inverted.....I was just wondering if anyone use a MAC percentage that seemed pretty standard for 3d?

[flyingairplanes]

I'm guessing that most people don't get that technical these days as far as an actual percentage figure.
The norm seems to be to put the plane in a 45° upline inverted and see how the plane
reacts. (no pun intended) (-:

It should not climb, but nose slightly toward the ground.

It also depends on your flying style and particular airframe.