Propellers and rotors The pitch of a propeller blade is usually expressed in ?

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Propellers and rotors The geometric pitch of a propeller is the ?

exemple 34 — Propellers and rotors the geometric pitch of a propeller the Distance a propeller blade element travelling in forward direction in one propeller revolution, angle of a blade element, lenght of chord line of one blade element, distance a propeller would have to advance in one revolution to give no thrust.

Propellers and rotors Propeller efficiency may be defined as the ratio between ?

exemple 35 — Propellers and rotors propeller efficiency may be defined as ratio between Power available / power required, power required / power available, thrust / power, power / thrust.

Propellers and rotors a propeller blade twisted so as to Equalize lift over entire length of blade, cancel coriolis forces, move centre of gravity of blade, increase lift on blade.
The statement that best describes effect of center of gravity on aircraft stability A forward center of gravity increases natural stability of an aircraft, a rear center of gravity 5 degrees right increases natural stability of an aircraft, the center of gravity position does not affect stability of aircraft, a rear center of gravity increases natural stability of an aircraft.
Indicate how conventional multicopter controls its attitude The engines change their rotational speed (rpm) according to desired direction of flight, the engines are oriented according to desired direction of flight, the propellers change their pitch according to desired direction of flight, the pilot controls ailerons the elevator in desired direction of flight.
The ground effect Reduces induced drag, increases air resistance, increases speed of aircraft, increases parasite drag.
Question Section 7: Theory of flight 33 Answer 8

The laminar layer on a wing profile The thin, smooth flow on extrados, from leading edge to point of transition, the thin, smooth flow on intrados, from leading edge to point of transition, the thick turbulent flow on intrados, close to trailing edge, the thick turbulent flow on extrados, close to trailing edge.
Question Section 7: Theory of flight 33 Answer 9

The turbulent layer on a wing profile The thick turbulent flow on extrados, after point of transition, the thick turbulent flow on intrados, after point of transition, the thin, smooth flow on extrados, from leading edge to point of transition, the thin, smooth flow on intrados, from leading edge to point of transition.
Question Section 7: Theory of flight 33 Answer 10

The imaginary line joining leading and trailing edge of wing called Cord line, dihedral, incidence, camber.
Question Section 7: Theory of flight 33 Answer 11

The part of wing shown the arrow 55 A flap, an aileron, the vertical fine, the keel.
Question Section 7: Theory of flight 33 Answer 12

Spoiler extension a fixed wing drone causes An increase in drag decrease in lift, an increase in lift only, an increase in lift drag, decrease in drag only.
Question Section 7: Theory of flight 33 Answer 13

Induced drag associated with Lift, the angle of attack, the angle of incidence, the friction of relative airflow on contour of aircraft.
Question Section 7: Theory of flight 33 Answer 14

Parasit drag associated with The friction of relative airflow on contour of aircraft, lift, the angle of attack, the angle of incidence.
Question Section 7: Theory of flight 33 Answer 15

Wing stall occurs when we exceed Its critical angle of attack, the maximum allowable operating weight, the aspect ratio of wing, the maximum allowed speed.