Apples to oranges, but...
I have an 800mm Corsair that requires up elevator to fly straight and level. If you go to Motion's site and look at the glamor shots of the plane, almost all of the pics show it flying with up elevator. We discussed this on the 800mm warbird thread, and the general consensus was the horizontal stabilizer is not in line with the thrust angle of the prop. Several folks modified their Corsairs by shaving the area where the H-stab fits, by basically lowering the front of the horizontal stabilizer a couple of millimeters. Then, they can fly straight and level with the elevator at true neutral. Basically, it was a design flaw (maybe?) that wasn't caught, and corrected at the factory.
Link to the Corsair here. http://www.motionrc.com/fms-f4u-cors...-wingspan-pnp/
Now, maybe the demo pilot was just holding up elevator when the all of the pictures were snapped, but it does seem odd that it's up in every picture. Also, it's about the same amount of up trim mine needs for straight and level flight.
Like I said, apples and oranges. Just throwing it out there...
Edit: I did try moving CG to the rear to get the elevator neutral on that plane. It didn't work, just made for an obviously tail heavy plane. e.g. uncontrollable...
I have an 800mm Corsair that requires up elevator to fly straight and level. If you go to Motion's site and look at the glamor shots of the plane, almost all of the pics show it flying with up elevator. We discussed this on the 800mm warbird thread, and the general consensus was the horizontal stabilizer is not in line with the thrust angle of the prop. Several folks modified their Corsairs by shaving the area where the H-stab fits, by basically lowering the front of the horizontal stabilizer a couple of millimeters. Then, they can fly straight and level with the elevator at true neutral. Basically, it was a design flaw (maybe?) that wasn't caught, and corrected at the factory.
Link to the Corsair here. http://www.motionrc.com/fms-f4u-cors...-wingspan-pnp/
Now, maybe the demo pilot was just holding up elevator when the all of the pictures were snapped, but it does seem odd that it's up in every picture. Also, it's about the same amount of up trim mine needs for straight and level flight.
Like I said, apples and oranges. Just throwing it out there...
Edit: I did try moving CG to the rear to get the elevator neutral on that plane. It didn't work, just made for an obviously tail heavy plane. e.g. uncontrollable...
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