Oral Exam Page 14

Explain turning tendencies. (PHAK 4-26)

• Torque – clockwise spinning prop causes airplane to roll left about the longitudinal axis. This is an example of Newton’s 3rd law. On the ground, this left rolling tendency causes more weight to be on the left main gear thereby increasing the friction and inducing a left yawing tendency.

• Gyroscopic Precession – During a descent the tail rises and causes a force to felt on the top of the propeller. The resultant force is therefore 90 degrees ahead in the direction of the rotation (RIGHT SIDE of propeller) causing a left yawing tendency. This is mostly associated with tailwheel aircraft because on their takeoff roll the tail has to be raised and this creates a left turning tendency. This is otherwise a right turning tendency in a climb because the effective force would now be at the bottom of the propeller and thus the effective force would be on the LEFT SIDE. The other left turning tendencies, however, make this effect negligible.

• Asymmetrical Thrust/P-factor – In a climb, the descending propeller blade (RIGHT SIDE) has a greater angle of attack and therefore creates more lift. This causes a left yawing tendency.

• Spiraling Slipstream – Propeller wash strikes the aircraft of the left side of the vertical stabilizer causing a left yawing tendency. The slipstream also strikes the right wing from above causing a right rolling tendency. The left rolling tendency from torque, however, makes this effect negligible. All of these tendencies are more pronounced at low airspeeds, high angles of attack, and high power settings.

What is the wingspan and length of the archer and why is it important? (POH 1-2)

It is 35.5 feet wingspan and 24 feet long, important for hanger/parking spacing at new airports as well as calculating ground effect with wing span

Describe the engine in this aircraft (6-pack/G500). (POH 1-3)

• Lycoming O-360-A4M

• horizontally opposed 4-cylinder air cooled direct drive carbureted reciprocating piston engine

• Naturally aspirated

• 180 HP at 2700RPM

• 360=cubic inch displacement

• “O”=horizontally opposed

-2 magnetos, 8 sparkplugs

Describe the engine in this aircraft (G1000). (POH 9-46)

• Lycoming IO-360-B4A

• horizontally opposed 4-cylinder air cooled direct drive fuel injected reciprocating piston engine

• Naturally aspirated

• 180 HP at 2700RPM

• 360=cubic inch displacement

• “0”=horizontally opposed

• 4=4 cylinders