GRAUPNER ASH 31 MI Instruction Manual

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY

Changes reserved! No liability for printing errors ID. no. 0063067 07/2012

1

for Order no. 42125

42135

Instruction Manual

ASH 31 MI

RC Glider and Electric Aircraft

for

Slope Flying, Towing and Electric Flight

A remote control with 6 functions is needed!

This models is not a beginner model and is only

intended for experienced model builders!

The present model is a technically mature design with well-balanced flight
characteristics. The pre-assembly of a number of the individual parts enables a rapid
building process.

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY

Changes reserved! No liability for printing errors ID. no. 0063067 07/2012

2

Technical data

Wingspan, about 4510 mm
Length about 1785 mm
Wing airfoil TA06/11
Tailplane airfoil NACA 009
Total surface area about 79 dm²
Flying weight depending on
equipment from about 5500 g Glider
7000 g Electric
Center of gravity about 95 mm behind the leading edge measured on the left and

right of the hull.

Longitudinal dihedral about 1°

Notices for the construction of the model

Before building of the model, be sure to study the manual from start to finish. Be
aware of the potential dangers associated with the use of tools.
Clean all oily residue off of the surfaces to be adhered prior to adhering them. This
can be achieved with light sanding and a non-oily cleanser. Prior to adhering parts,
make sure to roughen the corresponding surfaces (especially with GRP hulls)
carefully using a fine sandpaper and be sure to thoroughly remove all grease and oil
using acetone, etc. Otherwise, sufficient adhesion cannot be guaranteed.

Required tool for the construction of ASH 31 MI

Pencil (hardness HB), all-purpose pen, geometry triangle, as well as a measuring
tape or meter stick, household scissors, a thin and sharp knife - such as a balsa
knife Order No. 980, small electric drill, various spiral drills, Allen wrenches, injection
syringe Order No. 729.3.

Adhesion of materials
The table below shows some examples for adhesive bonds.
It should not be considered exhaustive.

Material Adhesion example Adhesive
Order No.

GRP with Hull with UHU plus endfest 300
Plywood Landing gear ribs Order no. 950.43

GRP with Hull with UHU plus endfest 300
Aluminum F tow coupling Order no. 950.43

Areas of the hull without pull-away material which are to be adhered must be sanded
using a fine grain sandpaper in order to remove any remaining release agent. Wipe
away sanding dust. In the process, the shiny surface of the hull must always become
matte, otherwise a good adhesion of the adhesive with the hull cannot be assured.
To join the individual parts with one another, make sure to following the
corresponding instructions for use provided on the adhesive. Additional adhesives
can be found in the FS catalog.

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY

Changes reserved! No liability for printing errors ID. no. 0063067 07/2012

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When using adhesives with solvents, make sure that the room is well-ventilated.
Observe the manufacturer's notices.

Remote control system

Strongly recommended: Computer system mc-32

Recommended servos:
Rudder DES 678 BB,MG Order no. 7943 1 unit
Elevator DS 3288 BB,MG Order no. 5187 1 unit
Outer aileron DS 3288 BB,MG Order no. 5187 2 units
Center aileron DS 3288 BB,MG Order no. 5187 2 units
Camber-changing flap DS 3288 BB,MG Order no. 5187 2 units
Landing flap DES 678 BB,MG Order no. 7943 2 units
F tow coupling DES 678 BB,MG Order no. 7943 1 unit
Retractable landing gear HBS 760 BB,MG Order no. 7985 1 unit
Wheel brake HBS 760 BB,MG Order no. 7985 1 unit

For the connection of the servos to the receiver

6x Servo voltage regulator PS 5.9 volt Order no. 4197
For battery connection cable 4x Order no. 3941.6
1x Order no. 2985.D
Required servo extension cables
Order no. 3935.180 For elevator 1 unit
Order no. 3935.180 For rudder 1 unit
Order no. 3935.75 For connection to the receiver 8 units

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY

Changes reserved! No liability for printing errors ID. no. 0063067 07/2012

4

Order no. 3935.65 For connection to the receiver 2 units
Order No. 1587-20 Hook-and-loop cable tie 1 package

As a receiver battery, we recommend a two-cell LiPo battery with a capacity of at
least 5 Ah, e.g. Order no. 99013, which must always be well-maintained before and
after flight.

Rechargeable batteries are recommended for the receiver and transmitter, because
they offer the greatest safety.
See the FS catalog for the corresponding charger.
Foam rubber for the bearing of the receiver
Hook and loop tape Order no. 3368.1 for the fastening of the receiver
Hook-and-loop cable tie Order no. 1587 for the fastening of the drive battery

Required accessories
Retractable landing gear Order no. 1137

Cockpit equipment Order no. 1055.1
Joystick set Order no. 1064.2

Assembly of the ASH 31 MI

Only the assembly of the electric version is described in the assembly manual.
Obviously the work pertaining to the extend/retract drive is omitted for the glider
version.
Only begin with the assembly once you are familiar with the components and
individual building stages. If there are grounds for objection of a component, inform
your specialist dealer prior to beginning with the construction.

The hull

All parts of the hull to be adhered must be sanded with sandpaper until the area to be
adhered becomes matte (also refer to the information in the adhesives table).
Remove the pull-away material on the adhesion areas of the hinge joints for the
closing flaps of the landing gear and extend/retract drive. Attach the hinges at the
flaps and hull as shown in the photos. In the process, make sure that the gap
between the hull and flaps is the same size all the way around.

After the adhesive hardens, it should
adhered with a strip of glass fabric leaving a slight protrusion for the hinged joints.
Torsional springs must be bent from the accompanying Ø 0.6 mm steel wire to close
the flaps and must be adhered as shown in the photo.

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY

Changes reserved! No liability for printing errors ID. no. 0063067 07/2012

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As you can see in the photos, stops in the hull are adhered at the ends of

the flaps so that the flaps end flush with the outer contour of the hull.
The ribs for the extend/retract drive and the retractable landing gear are only
attached in the hull and still have to be adhered with 24-hour epoxy resin.
The retractable landing gear and the extend/retract drive are mounted in the hull after
the adhesive has hardened.

Please follow the instructions accompanying the landing gear for the assembly of the
retractable landing gear. Here are a few photos showing how the retractable landing
gear is assembled.
Now insert the retractable landing gear into both ribs and fasten using the Allen
screws and the holder bracket.

The extend/retract drive is screwed onto the rib with the two screws.

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY

Changes reserved! No liability for printing errors ID. no. 0063067 07/2012

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The screw must be secured against loosening with UHU thread-lock.
For the assembly of the tail wheel and the rudder servo, the recess at the hull end
must be cut out and filed down to match the tail wheel.

Adhere the fin end and rudder servo board together.
Extend the rudder servo connection cable with the appropriate extension cable.
Secure the plug connection against loosening. Using rubber bushes, rivets and the
accompanying screws, fasten the servo to the board.
Attach the rudder linkage to the servo lever as shown in the photo.

Now the fin end can be adhered. In the process, make sure that it is recessed from
the edge approx. 13 mm at the bottom and approx. 11 mm at the top.

GRAUPNER GmbH & Co. KG D-73230 KIRCHHEIM/TECK GERMANY

Changes reserved! No liability for printing errors ID. no. 0063067 07/2012

7

Drill a Ø 2 mm hole on the left and right side of the hull for the bearing shaft of the tail
wheel corresponding to the specifications in the photo. Mount the tail wheel together
with the bearing shaft in the hull. Adhere the bearing shaft on the right and left sides
of the inside of the hull.

Check whether the rudder can move equally far to the left and right. Remove the
rudder, apply adhesive to the GRP bearings and re-insert the rudder and bearings in
the same position. Secure the rudder against slipping with adhesive strips until the
adhesive hardens. After the adhesive hardens, mark the position of the control arm.
Drill a Ø 4 mm hole in the rudder. Attach the steering linkage in the servo lever and
with the Z-bending in the control arm. Check the correct length of the linkage with the
servo mounted in the rudder center position and the control arm connected. Now
adhere the control arm to the rudder with adhesive.