Multi-Engine

Accelerated Slipstream

The descending propeller blade takes a bigger bite, so the fastest part of each slipstream — and the extra lift it makes on the wing behind it — is displaced toward that blade. With both props turning clockwise the fast patch lands outboard on the right wing and inboard on the left. Fail an engine and the surviving one rolls you toward the dead side; the right engine does it with the longer arm.

Rear view · looking forward

accelerated slipstream + its lift roll toward the dead engine—

Power & angle of attackHighCruise (fast, low power) → slow flight at climb power. More power makes the slipstream stronger; more angle of attack pushes it further toward the descending blade.

Side · faster air over the wing

Right engine rotationCounter-rotating: the right engine's descending blade moves to the left, so its fast patch sits inboard — a mirror image of the left engine.

Rolling moment left by the surviving engine

Lose left engine
(right engine working)

Lose right engine
(left engine working)

Accelerated slipstream

PAST

PP-factor
AAccelerated slipstream
SSpiraling slipstream
TTorque