grunf Posted November 20, 2015 Posted November 20, 2015 (edited) Moving the stick forward causes the slip indicator ball to move all the way to the side, usualy left. The stick has to be moved pretty far, almost to the redout point. The plane itself doesn't seem to slip. I wonder if this behavior is intentional, and if it is, what's causing it? Edited November 20, 2015 by grunf added screenshot
Goblin Posted November 20, 2015 Posted November 20, 2015 Interesting! I haven't seen it myself... Could this be because of gyroscopic precession from the engine..? Does it move to the right if you pull the stick?
grunf Posted November 20, 2015 Author Posted November 20, 2015 Interesting! I haven't seen it myself... Could this be because of gyroscopic precession from the engine..? I don't think so. It also happens with the engine off. :D Does it move to the right if you pull the stick? No. The only time I saw it move right is when I push the stick while the plane is banked to the right.
Cykyrios Posted November 20, 2015 Posted November 20, 2015 (edited) This is actually normal behavior for any slip indicator: the ball wants to "fall", so if you stand still on the ground, it will be at the lowest point, which is the center. If you turn, it will go toward the outside of the turn. Now, if you push the stick forward, you get negative Gs, which you can also get by flying upside down; I would be surprised to see the ball centered while upside down. I'm pretty sure the only cases where it would be centered under negative Gs are somewhat high friction between the ball and the tube it runs in, and actively trying to balance the ball, which first requires sending it there when it wants to fall to either side. Edited November 20, 2015 by Cykyrios
grunf Posted November 21, 2015 Author Posted November 21, 2015 This is actually normal behavior for any slip indicator: the ball wants to "fall", so if you stand still on the ground, it will be at the lowest point, which is the center. If you turn, it will go toward the outside of the turn. Now, if you push the stick forward, you get negative Gs, which you can also get by flying upside down; I would be surprised to see the ball centered while upside down. I'm pretty sure the only cases where it would be centered under negative Gs are somewhat high friction between the ball and the tube it runs in, and actively trying to balance the ball, which first requires sending it there when it wants to fall to either side. That makes sense, thank you. :) Before opening this thread I tested it in MiG-21, however MiG's ball remained centered. After reading your post, I tried several different planes, and majority behaves like L-39.
Goblin Posted November 21, 2015 Posted November 21, 2015 the ball wants to "fall", so if you stand still on the ground, it will be at the lowest point, which is the center. DUH! Of course... Why didn't I think of that? It was late, I was tired and I had a beer... That's my excuse, and I'm sticking to it! ;)
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