ATPS (Critical Engine Factors)

Question 1

A

Answer 1

Accelerated Slipstream (Roll). More relative wind on the outer part of the wing due to prop rotation. Traditionally on the right wing which causes left banking tendencies.

Question 2

T

Answer 2

Torque (Roll). Prop spins right so the aircraft tends to roll left.

Question 3

P

Answer 3

P-Factor (Yaw). At low speeds and high power settings more thrust is generated on the downward moving prop blade resulting in a longer lever arm for that increased force on the right engine. This results in a left yawing movement.

Question 4

S

Answer 4

Spiraling Slipstream (Yaw). Slipstream off of the left engine hits the vertical stabilizer on the left side causing left yaw tendencies. The right engine slipstream doesn’t hit anything.