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Power Grunt Hobbies - Hobby News

Falcon 120 modifications for Turbine use!!!

The Falcon 120 can be flown
by a 1.20-1.60 Glow engine or
a 10-14Lbs thrust Turbine.
Below are the modifications we
done to our kit to add strength
to the airframe for turbine power.

Our engine choice will be the
PST600 which is rated at 6kg thrust
and will suit the falcon 120 nicely.











WING TUBE


First thing was to make sure that the wing tubes are glued securely, you will see in the picture I used 30 min Epoxy and ran a full bead of glue around the tubes, make sure to check the tubes in both wings.
There are four wing ribs that I applied the glue to, this will make sure the wing tube is secure.
Make sure to check both the front and rear wing tubes.







LANDING GEAR MOUNTING BLOCKS

Next was to reinforce the landing gear mounts and to do this I made up some triangle gussets out of 10mm square hardwood stripped down to shape which were then glued to the corners of the formers and the retract blocks.

I used 30min epoxy and small strips of fiberglass cloth between the triangles to add extra strength, This was applied to all the mount corners between the rib and retract blocks.
You will need to make a total of 16, 8 triangles per wing.





Wing Servo Mounts

The servo set up for the aileron and flap's are mounted straight onto a plywood plate glued under the wing sheeting which will work fine but as the servo protrudes outside the wing I wanted to add to the streamlined look so I made up my own servo mounts from 1.6mm ply plate which I then bolted two L brackets to mount the servo on then laminated the top with 1.5mm balsa and sanded it to the wing profile so that only the servo arm and linkage was all that will be seen.


My choice of servo was the Hitec digital HS-5245MG, these are rated at 5.5kg torque on 6V and as I will be using a 5 cell RX battery they will have plenty of torque to fly the falcon.
The below pictures show the way I installed the servo plates to the wing,

  • First I cut the balsa sheeting away from the wing to clear the servo plate.
  • Next cut the ply so that there is approx 1mm clearance for the servo to drop into the wing freely.
  • Once the servo mount fits the wing I then added 1/8" plywood around the wing so that later I can add a counter sink screw to each corner of the servo plate.



    Below pictures show the servo mounted in the wing with the black circle finished ready for the linkage to be fitted.



    We custom made the PST600 turbine mount shown below which is available from us along with
    a full accessories kit with heavy duty horns, metal links etc handle the higher loads of the turbine.



    Below Pictures were taken at its maiden flight at Wangaratta Jets 08

    Finished Weight w/o Fuel is 6.2Kg

    Flight performance is very stable in both slow and fast flight with no sign of dropping a wing.
    The Flaps are very affective and will slow the falcon to a landing speed of most sport models
    which makes it perfect for small grass fields.





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