ADY - Control

Question 1

Thrust and drag produce a nose ….. moment

Answer 1

up

Question 2

Lift and weight produce a nose ….. moment

Answer 2

down

Question 3

lift acts ….. weight

Answer 3

behind

Question 4

Ground adjustable trim tabs:

Aileron:

Answer 4

Tab down - wing down

Question 5

Ground adjustable trim tabs

Rudder:

Answer 5

tab left - tail left

tab right - tail right

Question 6

Ground adjustable trim tabs

Rudder - a simple way to remember which way to bend the tab is to …..

Answer 6

simply bend the tab in the direction you want the ball to move

Question 7

5 points about stabilators …..

Answer 7

1. one piece symmetrical aerofoil
2. Requires less deflection for the same result
3. Achieves trim wil less parasite drag (half as much)
4. +30⁰ to -20⁰
5. Improves control in transconic speeds from 0.8 to 1.2

Question 8

If your controls are feeling a little too light what type of tab would you be using …..

Answer 8

an anti-balance or leading balance tab

Question 9

If your controls are feeling too heavy what type of balancing tab will you need to use …..

Answer 9

A balance tab or a lagging balance tab

Question 10

How do you adjust an anti-balance tab …..

Answer 10

1. Elevator up - tab up
2. Elevator down - tab down

Question 11

How do you adjust a balance tab …..

Answer 11

1. Elevator up - tab down
2. Elevator down - tab up

Question 12

Describe how a Spring Tab for a rudder works ….

Answer 12

There is a spring with a pre-set limt applied to the tab. Once that limit is exceeded the bellcrank breaks and the spring assists in the deflection of the rudder

Question 13

Elevator trim - Changing the incidence of the tail plane. Explain how this works …..

Answer 13

Much the same as a stabilator. The control moves the leading edge of the tail plane, this in turn requires less deflection and produces less parasite drag

Question 14

What are aileron spades for ……

Answer 14

They greatly assist the physical effort required to pull on the controls at high speeds and high AoA in aerobatic aircraft

Question 15

Name the 2 ways that aileron drag is reduced …..

Answer 15

1. Frise ailerons
2. Differential ailerons

Question 16

Describe the action of the aileron input …..

Answer 16

1. The up aileron is the direction of roll
2. The down aileron is the direction of yaw (opposite)

Question 17

Spoilers do 4-things, name them …..

Answer 17

1. They spoil the lift on touch down
2. Allow high rates of decent without excessive airspeed
3. Assist to enhance roll
4. Effective through a large speed range

Question 18

Describe horn balancing …..

Answer 18

Where a horn pretrudes from the control surface on the opposite side to the deflection. This horn meets the airflow to assist in the deflection

Question 19

Mass balance is designed to prevent …..

Answer 19

Aileron flutter

Question 20

Describe how mass balancing works …..

Answer 20

Counter weights are inserted to bring the CoG closer to the hinge of the control surface

Question 21

Differential Ailerons are rigged so the downward travel is ….. than the upward. This is usually ……

Answer 21

less, 1/2

Question 22

Describe how frise ailerons generate more parasite drag …..

Answer 22

When the wedge shaped aileron is deflected up the bottom section prtrudes into the airflow disrupting the airflow and creating more parasite drag