Build rudders on Durafly D.H. 100 Vampire MK 6

The model, as delivered, has no rudders. The full size Vampire has two.
I have flown a Durafly Vampire during several years and I have missed the rudder

Now I have bought a second Durafly Vampire (Canadian version) and I modified it
to have two working rudders.

Rudder design
An extra servo, mounted in the stabilizer, controls both rudders with a pushrod.

The hinges are two half's of a nylon hinge per rudder.

The control horns,which I made myself from aluminum plate and CA-glue,
 points forward, inside the tail boom.

Vampire rudder parts


Rudder horn drawing

roderhorn
The rear parts of the stabilizer, beside the elevator, need strengthening around the push rod hole.
See pictures below.

enforce


Stabbe1


To get the CG more forward I use 4.1 gram servos for the rudder and the elevator.

servos


Right push rod connection

righthorn


Left push rod connection

lefthorn


Hood made of brown paper

cover


The servo installation is hidden with brown paper and white glue/water 50/50.

Brunpapper


Painted and ready!

målat



Bill of material
  1. 1 pcs push rod of 1 mm piano wire threaded in one end
  2. 1 pcs of plastic tube for the push rod above
  3. 1 pcs servo link for the thread above
  4. 1 pcs E/Z connector (Push rod connector)
  5. 2 pcs digital servos ES9051    EMax ES9051D 0.8 kpxcm, 4.3 g, 0.09 s
  6.  Brown paper and white glue
  7.  Balsa to strengthen the stabilizer
  8. Aluminum plate 0.5 mm for rudder horns
  9. 2 pcs  nylon hinges
  10. Color: silver or aluminum
Building instructions

Replace the elevator servo with an ES9051 servo.
 Cut out the rudders from the fins.
Make the rudder horns from the aluminum plate (CA glue).
Glue the rudder horns and the hinges to the rudders.
Cut out some space for the rudder horns in the fins. (= the end of the tail booms).
Cut out a pocket for the rudder servo and mount it provisionally.
 Make a hole for the push rod ,with its tube and glue the tube to the stabilizer.
Mount the servo link on the push rod (half way on the threads) and mount the E/Z connector.
Glue the left rudder to it's fin and connect the servo link to the rudder horn.
Mount the right rudder provisionally in it's fin and decide where the push rod should be bent
 to give both rudders the same deviations.
Disconnect the servo link on the left rudder and bend the push rod at the right end.
 Glue the right rudder to it's fin with the hinges when the rudder horn is connected to the push rod.
Connect the left servo link again and adjust as needed.
Mount the rudder servo permanently.
Make the  balsa reinforcements for the stabilizer and glue them in place.
Make the hoods of brown paper and glue them in place.
Cover the servo installation with brown paper and white glue / water 50/50.
Paint the brown paper with silver or aluminum color.
All set, I believe.