Albee
Member
Does anyone know if there is a standard scaling for skid/slip balls in aircraft instruments (or, specifically, what scaling Dynon uses)?
To clarify, we all know we want to keep the ball in the center, and there are the two reference lines to tell us where that is. But the actual old mechanical instruments used a curved clear tube so there was a linear relationship between the angle of the lift vector and the direction it should point (straight up from the wing). When someone is half a ball off, or a full ball off, what is that angle? Some poking around in online search hasn't led to anything. I measured my old T&C, which came out when Dynon went in, and I got 5 degrees equal to one ball width. So I'm wondering if that's one of those de-facto standards that isn't written down, or just whatever the instrument maker thinks is good?
To clarify, we all know we want to keep the ball in the center, and there are the two reference lines to tell us where that is. But the actual old mechanical instruments used a curved clear tube so there was a linear relationship between the angle of the lift vector and the direction it should point (straight up from the wing). When someone is half a ball off, or a full ball off, what is that angle? Some poking around in online search hasn't led to anything. I measured my old T&C, which came out when Dynon went in, and I got 5 degrees equal to one ball width. So I'm wondering if that's one of those de-facto standards that isn't written down, or just whatever the instrument maker thinks is good?