User manual Crack WING BLEUE RC Factory
Crack Wing
Building Instructions
1. Glue (use Cyanoacrylate – CA – glue) both wing halves together.
2. Cut through the little bridges in the spar slots and CA glue the spars into the wing.
3. Center your servos and put the servo horns on, rectangular to the servo orientation. Install
the adjustable links into the horns. With the wing in upside down position, install the servos
and secure them with medium or thick CA or use your favorite method. The pushrods and
horns are on the lower side of the model. There is a pre-cut slot for the control horns in the
elevons. Cut it all the way through, using sharp hobby knife.
4. Install the Z-bends on the pushrods (1 x 140mm) – CA glue them on and cover the joint in
shrink tube (4a-4c). Insert the Z-bends into the elevon horns. Deflect the elevon and insert
the pushrod into the adjustable link in the servo arm. Neutralize the elevon and tighten the
screw in the servo link. Cut away excess length of the pushrod.
5. Glue the reinforcement on the bottom of the wing.
6. Glue the reinforcement on the top of the wing (upper “fuselage” or “canopy”). CA glue the
motor mount.
7. It makes sense to put the propeller on the motor first – the access is later somewhat limited.
If you use flexible prop mount, use a very tight O-ring or maybe two instead of one. When
you crash the wing, the prop tends to swing and bite into the foam – if it is attached in too
flexible way. Remember that the prop is in pusher configuration and attach accordingly.
Install the ESC and receiver. Cut through the indicated locations on the rudders and SFGs.
According to the size of your servos, you may have to cut away some more foam from the
rudders. Install (CA glue) the rudders into the wing. Install the SFGs. The Center of Gravity is
recommended to be 13 mm back from the main spar.
The battery should have a tight fit in the opening – you may modify the opening to your
battery size. The default opening is for a typical 240 mAh 2s pack, which should balance the
model well. Finally glue the lower fuselage.
Model Setup:
Less experienced pilots should adjust their elevon throws in such a way that maximum
deflection of both aileron and elevator sticks move the elevon within the rudder cut-outs.
Expert pilots may increase the throws in such a way that aileron or elevator stick deflection
alone moves the elevon fully to the limit of the rudder cut-out. In such case you must limit
the servo travel, to avoid mechanical collision and damage to your servo.
What you need for the build:
A workbench, preferably covered in polyethylene foil
CA glue + kicker
Sharp hobby knife
Little cutters or hobby saw