The effect of normal acceleration during the pull up maneuver will not be discernible on the non-compensated variometer. However, it is easily seen on the TE variometer if it is well compensated because the part of the vertical speed which is due to the trajectory's inclination is compensated out, and the part due to the energy loss caused by the increased drag is still indicated. During actual pulling where the load factor is high, the additional loss can lead to an additional sink rate which exceeds the glider's polar sink rate by an important amount. Therefore it becomes clearly visible on the TE variometer. Conditions are inverted in a push over maneuver.
Lift is reduced and also drag, and consequently the energy loss rate.
The sink rate indicated by the TE variometer decreases as the glider follows it's curved trajectory. It can approach zero sink rate in the case where one follows a parabolic trajectory near zero 'G', calm air being assumed. For other gliders, the effect is essentially the same. The normal sink rate will double when pulling up at 1.5 G at a speed of 44 kts, or when flying at 48 degree bank angle at the same speed. Upon pulling even more, the flow around the wing will begin to separate.