Construction / tuning:
The shape of this plane fascinated me since I first saw it two years
ago. Like a real plane!! However the stock version did not have ailerons
and a push motor (brushed 300-er) on a pylon on top of the wings. As
usual I started to modify.
- I fixed two mini servos (left over from some indoor flyer) in the wings,
cut out the ailerons (3 x 25 cm each) run the cable jointly with the CFK
rod to the fuselage. There I burned a hole from the cabin area to the
wing center where I could run the wires into the cabin area to the
- Then I cut of the front of the plane and glued on (with epoxy) the motor
mount of an EasyGlider Pro - first I flew with a 28 mm dia outrunner,
however this setup required me to add weight at the end of the
fuselage - so I decided to down scale the motor to the same setup as
the Merlin (Multiplex) a 22mm dia motor with approx. 100 W. Although
this plane is double the wing span of the Merlin the power of that motor
on 3 Lipos was good enough for vertical climbs in the Merlin, so I
thought that it should be sufficient for the Discus! And it was! Although
not vertical, but at a good 45 degree the plane climbs towards the
The downside of this installation was that I had to trim the canopy too
(not too well done, I should spend some more time to make it
"rounder"... well during some rainy days on a rainy weekend when
there is no other plane to be build (.... that means almost surely ...
For further weigth reduction I left out the landing wheel.
What a beautiful sight - like a big one! However the Discus does not
like it slow - it falls over a wing very quickly - in my case most of the
time to the left! Therefor I do not recommend it really for beginners (and
I do not understand why Graupner sells it for that target market - they
will get quickly disappointed and de-motivated)..
The plane easily takes medium winds and climbs quickly in thermal
uplifts. It is stable enough for some acrobatics, but does not like flying
on its back!
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