john_tullamarine
Bellerophon has given the discussion a bit of a puch, he wants to know if assymetric thrust straight flying is possible with zero slip.
It an ideal condition since it would give you min drag.
Straight flight is only possible if the sum of the projection of all forces on the horizontal plane has no componrent perpendiculal to the TAS vector. Hense in the case of zero slip, perpendicular to the longitudinal axis.
Somehow you will need to balance the moment of the live engine.
I think what Bellerophon is looking for is possible but only at one single point (or confined area around this point) and speed and it may well be somewhere verh high above sea-level.
A point where rudder and bank forces are able to cope with the assymetric thrust.