commenting on Xiangyu's results.
Video, I find it a little hard to see what the plane is doing from that perspective, I recommend you take more from the side, I find it easier to see flight attitude that way.
Agree with Eric's comment on where you stand. Once you launch, back slowly away from the planes flight path, outside the circle. Less chance of the plane hitting you and as noted, you'd be surprised how much your body influences the local air movement. And back to the video, I personally find it easier to understand what the plane is doing from the side as opposed to being under it
General comment on mono vs bi-plane. Drag, yeah, at some point that becomes very important. With the faster planes this year, perhaps even more so.
I know you like the end posts to keep the wings tied together, but I'm not sure you really need them and I suspect they are a big source of drag. Consider sticking to the conventional solution of only two wing posts.
End fences. They do nicely taking the place of dihedral, but can be a surprisingly large source of drag if they aren't aligned correctly (think snowplow). You have the fences on both wings, consider dropping the lower ones, I suspect you don't need them.
Turn diameter. Turns are inefficient, we have to turn to stay in the gym, but larger turns are lower drag than smaller. Try to trim to the largest circle you can fly without significant risk of hitting the walls.
Jeff Anderson
Livonia, MI
) to 20.5 feet for four minutes, after which the motor was 32.125" (3/8" increase). Relubed weight=2.85g (with O-rings).
