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Aerodynamics What makes 'em fly? Designs & technology related to aerodynamics.

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Old 06-21-2009, 01:42 PM   #1 (permalink)
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Default MAC for 3d

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.
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Old 07-11-2009, 08:28 AM   #2 (permalink)
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Arrow Re: MAC for 3d

What plane are you flying?
Are you carrying any up trim in the elevators when upright?
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Old 07-15-2009, 11:15 PM   #3 (permalink)
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Default Re: MAC for 3d

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?
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Old 07-16-2009, 08:55 AM   #4 (permalink)
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Default Re: MAC for 3d

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.
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