Asymmetric Push Pull

[LaGaffe]

Another idea I've toyed with is something asymmetric, something along the lines of Gotha G.VI (or imagine a twin engine BV-141 with a pusher prop behind the pilot). A twin engine aircraft with a tractor port engine and a pusher starboard engine. The pusher (given what can be accomplished in my kitchen with VarioProps) will presumably be less efficient than the tractor (by how much? anyone with a reasonable ballpark guesstimate?) so it should perhaps be a tad further from the centreline of the model than the tractor and main fuselage (would help balancing the contraption as well), but by how much? (Given reasonable guesstimates of slipstream effects on the tail-feathers etc.)

Cheers/tm

[BMatthews]

A pusher prop is only less efficient due to the mass of structure that is located in the airflow. If the design uses a fine enough taper to the fuselage then it should not have much effect.