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it to hang freely. Ideally the model will balance level with the
nose angled slightly down.
- If ballast is required, secure it carefully so that it cannot
possibly shift in flight, as this would alter the model's Centre
of Gravity.
Checking the control surfaces
- Set the transmitter sticks and trims to centre.
- Switch on the transmitter, then the receiving system.
- All the control surfaces should now be at centre (neutral).
If necessary screw the clevises in or out on the pushrods
until this is the case.
- Stand behind the model and operate the rudder stick:
when you move the stick to the right, the rudder should also
deflect to the right.
- Pull the elevator stick back towards you, and the trailing
edge of the elevators should rise.
- When you move the aileron stick to the right, the trailing
edge of the right-hand ailerons should rise, the left-hand
ailerons fall.
- If any function works the wrong way round, correct it using
the servo reverse facility on your transmitter.
- Set the correct control surface travels as stated in Figs. 108
to 110.
- Insufficient travel: re-connect the pushrod further in on the
horn, or further out at the servo output arm.
- Excessive travel: re-connect the pushrod further out on the
horn, or further in at the servo output arm.
- Alternatively you can adjust the control surface travels using
your transmitter's servo travel reduction facility.
Checking the power system: the glow version
- Switch on the transmitter, then the receiving system.
- Loosen the socket-head screw in the pushrod connector on
the throttle servo. Apply full-throttle at the transmitter to run
the throttle servo to the "full-throttle" end-point.
- Move the throttle pushrod forward by hand in order to open
the carburettor barrel fully. Re-tighten the socket-head
screw in the pushrod connector.
- Now check the function of the throttle at both end-points:
this is done by moving the throttle stick trim forward and
applying full-throttle: the throttle barrel in the carburettor
should now be completely open. If the servo works in the
wrong direction, correct it using the servo reverse facility on
your transmitter.
- At the idle setting the throttle barrel should close to the
point where there is a visible gap about 1 mm wide. Pull the
trim back fully, and the throttle barrel should close comple-
tely; this will cause the motor to stop. Check these settings
with the motor running before you fly the model for the first
time.
- Note: the throttle linkage must not be under tension or
strain at either end-point, as this stalls the servo and
causes it to draw a constant high current. If necessary
adjust the pushrod connector or alter the linear travel by re-
connecting the pushrod to a different hole.
- Preparing the motor: the glow motor must be properly run-
in before you fly the model for the first time. Adjust the
carburettor so that the motor runs smoothly at all throttle
settings. The motor should not change speed when you
hold the model nose-up or nose-down.
- Note: whenever you are working on the motor for adjust-
All manuals and user guides at all-guides.com
Assembly and operating instructions
Pitts S 1 ARF
Checking the power system: the electric version
- Switch on the transmitter, and check that the throttle stick is
- When switching off always disconnect the battery from the
Test-flying, flying the model
- Please read the sections in the Safety Notes entitled
- Note concerning the power system: a .40 glow motor
- For the initial test-flights please wait for a day with little or
- Assemble the model and repeat the check of the working
- The model must be taken off directly into wind.
- The model should be taken off from the ground.
- Carry out a few taxi-ing tests on the take-off strip, so that
- Once you feel confident with the model, place it directly into
- Adjust the trims of the other control surfaces as required
- Check the model's response to all the controls. Once the
- Take the model up to a safe altitude and check its minimum
- If you had to move the transmitter trims during the first flight,
robbe Modellsport GmbH & Co. KG
We reserve the right to alter technical specifications.
28
ment or maintenance, keep well clear of the rotational plane
of the propeller - injury hazard. Ensure also that no people
are standing in front of the model when the motor is running.
at the "motor stopped" position. Connect the flight battery;
this action also switches on the receiving system. Ensure
that the motor rotates in the correct direction. Check that
the motor responds properly over the full range of throttle
settings. If necessary make adjustments as described in the
instructions supplied with the speed controller.
speed controller first, and only then switch off the
transmitter.
"Routine pre-flight checks" and "Flying the model" before
you attempt to fly the Pitts for the first time.
provides more than adequate power for the Pitts S 1, and
offers a good reserve of power for ground take-off even from
a grass strip.
In the air the model does not require full motor power. The
throttle should be used as the primary means of controlling
the aeroplane's rate of climb and descent. If the Pitts climbs
too steeply, throttle back until it cruises straight and level. If
you wish to lose height, throttle back; if you wish to climb,
open the throttle gradually.
no breeze. Seek out a large, flat grassy field devoid of
obstacles (trees, fences, high-tension overhead cables etc.)
as the flying site.
systems as described above.
you have some idea how the model behaves on the ground.
wind and slowly advance the throttle stick to the full-
throttle point. When the aircraft has reached flying speed,
apply gentle up-elevator to lift off, taking care not to stall it.
Adjust the elevator trim immediately if necessary.
until the model is climbing straight ahead at a steady rate.
Pitts is back on the ground, the mechanical linkages should
be adjusted if necessary to increase or reduce the control
response.
airspeed. When landing the aeroplane keep its speed well
above the stall speed you have established.
adjust the pushrod lengths after the landing so that you can
move the transmitter trims back to centre. This ensures that
full trim travel is available to both sides of centre for subse-
quent flights.
No.
3049
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