Nieuport 17Gbr Slip Indicator

[czech693]

Is the slip indicator on the Nieuport 17Gbr operating backwards?  Since the tube is concave downwards (if only slightly), pressing left rudder should move the ball to the left (opposite of what happens when the tube is concave upwards).  It's moving opposite to the rudder press.

[AndyJWest]

It's clearly a bubble, rather than a ball - as in a spirit level. A ball wouldn't work with the curve going down at the ends. You are right though, it isn't moving in the right direction. Sideslipping makes the bubble go 'downhill'.

Edited March 29 by AndyJWest

[czech693]

You're right.  Gravity would pull a ball down into one end or the other, whereas a bubble floats.