GRAUPNER Discus 2CT, 4217.HOTT Operating Instructions Manual
GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY
Modifications reserved. No liability for printing errors. Id. No. 0062611 9/2011
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Order No. 4217.HOTT
OPERATING INSTRUCTIONS
DISCUS 2CT
Ready-to-fly RC model fitted with motor pylon,
three 850 mAh LiPo cells and HoTT receiving system
This model requires a HoTT COMPUTER SYSTEM
GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY
Modifications reserved. No liability for printing errors. Id. No. 0062611 9/2011
- 2 -
Please be sure to read through the safety notes in the Appendix to these operating instructions. If you ever dispose of the model, it is important to pass on the complete operating instructions to the new owner.
Introduction
The DISCUS 2CT is a semi-scale RC model aircraft which is capable of an
outstanding performance. The model can be converted in seconds from a pure
glider to a powered glider; all you need to do is fit or remove the motor pylon.
Please start by reading right through these operating instructions - before you
attempt to operate the model - and make yourself familiar with the method of
operating your HoTT transmitter. Keep the manual for your HoTT COMPUTER
SYSTEM to hand when preparing the model.
Pack contents
1. Fuselage, with factory-fitted motor pylon base and DES 231 rudder and elevator
servos, Graupner GR-12S HoTT receiver, PICO 8 speed controller, canopy with
snap-fit latch.
2. Wing with CFRP spar, decals applied
3. Tailplane and elevator horn, supplied loose
4. Factory-assembled motor pylon, complete with CAM PUSHPROP propeller
5. 3/850 LiPo battery, 11.1 V / 0.85 Ah, Order No. 7621.3BEC, with safety notes
6. 4217.HOTT operating instructions in German, English and French
7. Operating instructions for PICO 8 speed controller, various promotional brochures
Essential accessories (not included)
GRAUPNER HoTT COMPUTER SYSTEM transmitter min. MX 12 to MC 32
Transmitter battery charge lead Order No. 3022
Charge lead with BEC connector Order No. 3037
ULTRA TRIO PLUS 14 battery charger Order No. 6466
Essential adhesives (not included)
Cyano-acrylate glue (“cyano”), Order No. 5821, cyano activator, Order No. 953.150
Assembling the model
The model can very quickly be prepared for the air, but it is important to read and observe the following notes, as this will avoid problems, especially on the first flight.
Glue the tailplane to the fin, then connect the elevator horn to the pushrod and glue
the horn in the recess, as shown in the photo. Use cyano for these joints. This
GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY
Modifications reserved. No liability for printing errors. Id. No. 0062611 9/2011
- 3 -
procedure cannot be carried out at the factory for packaging reasons. Push the wing
into place and install the LiPo battery to complete the assembly stage.
The motor pylon
The motor pylon is a high-quality item which is supplied in the set ready to use. The
associated speed controller is set up as standard to suit the DISCUS 2CT; this
eliminates the need for any programming. Please note that the operating instructions
for the PICO 8 speed controller are supplied separately in the pack.
Binding the GR-12 receiver in the model to your HoTT transmitter
The “BINDING” procedure varies according to the HoTT COMPUTER SYSTEM you
are using; please observe the following notes, and the section entitled “Binding the
receiver” in the manual supplied with your radio control system.
1. Give the LiPo flight battery and the transmitter battery a full charge.
2. Locate the right-hand stick on your transmitter, and move it back towards you to
the “motor stop” position.
3. Now connect the BEC plug and socket between the speed controller and the LiPo
battery.
4. Initiate the “BINDING” procedure, and then carry out a full check of the working
systems. The servo leads should be connected to the receiver in the following
sequence: socket 1: speed controller; socket 2: rudder servo; socket 3: elevator
servo. This means that the throttle (motor control) and direction (rudder control)
are both assigned to the right-hand stick on the transmitter, and the elevator to
the left-hand stick. Pulling the elevator stick back towards you causes the elevator
to deflect up; moving it away from you causes it to deflect down.
5. If necessary, use your transmitter’s “Servo settings” menu to correct the direction
of rotation of the servos, and set the control surfaces exactly to centre (neutral
position). This is very important, otherwise the model will not fly straight, and will
constantly tend to climb or dive.
6. Now it is time to check the motor function by cautiously moving the right-hand
stick forward (away from you). It is always better to test the motor outdoors, and it
is very useful to have a friend to hold the model securely while you operate the
transmitter.
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