Tilt Wing Aerodynamic

Question 0

Nacelle

Answer 0

Forward nacelles produces a nose up attitude. Aft nacelles produce a nose down attitude

Question 1

Modes of Flight

Answer 1

VTOL
CONV
APLN

Question 2

Roll

Answer 2

Location of the engines, proprotors and gearboxes in the wingtip nacelles results in high inertia in the roll axis

Question 3

Yaw

Answer 3

Inertia is high like the roll axis, but the yaw control power is less

Question 4

Vertical

Answer 4

TCL Trust Control Lever controls overall trust, does not operate as a typical collective.

Question 5

Vertical takeoff to a hover

Answer 5

for takeoff approximately 90* nacelle will generally give a level deck attitude on takeoff

Question 6

Pitch up with sideslip

Answer 6

Refers to the pitch up tendency of the AC when the empennage and horizontal tail are directly downwind of a proprotor wash

Question 7

STO takeoff departure

Answer 7

60 or 75 degrees nacelle

Question 8

Transition to Forward flight

Answer 8

as the AC builds airspeed and the nacelles continue their forward movement, the control surface become increasingly effective

Question 9

Translational Lift

Answer 9

Power required decreases as forward airspeed increases

Question 10

Approach to landing

Answer 10

an increase in TCL will be required to maintain or arrest the descent.

Question 11

CONV mode

Answer 11

the corresponding increase in airspeed allows the FCS to respond to pilot inputs using the elevator, flaperons, and rudders to a greater degree than in VTOL mode

Question 12

Conversion

Answer 12

Anytime the nacelles are rotated aft

Question 13

ROL

Answer 13

Run on Landing may be necessary at decreased power margins or preferred in the presence of certain AC malfunctions

Question 14

APLN mode

Answer 14

Flight characteristics similar to a multi-engine turboprop AC

Question 15

Reduced Pitch Authority at High Mach and High Altitude

Answer 15

Prevent exceeding structural loads in flight