Great Planes PT-40 MkII Kit - GPMA0118 - Manual (Page 53)

Control throw adjustment: If you move the clevis at the
control horn on the control surface toward the outermost
hole, you will decrease the amount of throw. If you move
the clevis to a hole nearer the control surface you will
increase the amount of throw. If these adjustments do not
provide the desired throws, you may need to work with a
combination of adjustments by repositioning the pushrod at
the servo. If you move the pushrod toward the splined shaft
on the servo arm, it will decrease the control surface throw
– outward will increase it.
❏
1. “Eyeball” the side of the fuselage from 6 - 10 feet away.
If necessary adjust the height of the nose by raising or
lowering the nose gear wire so that your model will sit
pretty much level, as shown in the sketches.
❏
2. Once the correct ground stance is established, grind
the flat spot on the nose gear wire to lock the bottom
wheel collar in position. Use thread lock on the set screw.
Tends to lift-off
automatically on
takeoff.
May bounce and
become airborne
during landing.
Will lift off easily
on takeoff.
Lands predictably
and stays put on
runway.
May be difficult to
rotate on takeoff.
Sticks to the
runway after
landing.
Ground Stance
PT-40
ELEVATOR
(High Rate) (Low Rate)
3/8"(10mm) up 1/4"(6mm) up
3/8"(10mm) down 1/4"(6mm) down
RUDDER
(High Rate) (Low Rate)
3/8"(10mm) right 1/4"(6mm) right
3/8"(10mm) left 1/4"(6mm) left
AILERONS
(High Rate) (Low Rate)
9/16"(14mm) up 7/16"(11mm) up
3/8"(10mm) down 1/4"(6mm) down
Note: The balance and control throws for the PT have
been thoroughly tested and represent the settings at
which the PT flies best. Please set up your PT to the
specifications listed. If after a few flights, you would
like to adjust the throws to suit your taste, that’s fine.
Remember,
“more is not better.”
DUAL RATE TRANSMITTER
A feature available on some radios which allows you to
switch the control surface throws in flight is referred to as
“Dual Rates.” This lets you change the responsiveness of
your model for the type of flying you are doing.
The following throws are for a transmitter equipped for
Dual Rate servo control.
PT-20
ELEVATOR
(High Rate) (Low Rate)
3/8"(10mm) up 1/4"(6mm) up
3/8"(10mm) down 1/4"(6mm) down
RUDDER
(High Rate) (Low Rate)
3/8"(10mm) right 1/4"(6mm) right
3/8"(10mm) left 1/4"(6mm) left
AILERONS
(High Rate) (Low Rate)
5/8"(16mm) up 1/2"(13mm) up
3/8"(10mm) down 1/4"(6mm) down
results in more throw.
Moving the clevis inward on the control horn
throw
More
throw
More
More
movement
results in more pushrod movement.
Moving the clevis outward on the servo arm
Less
movement
movement
More
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