||Graupner speed 400 wired reverse for pusher configuration
||GWS Park HPX BB (0.67 Oz - 19
||8 cell AA 1400 and 8 cell AA 1800 from www.CheapBatteryPacks.com
(Elevon mix and throttle), using a Berg5 Rx and Futaba 6XAs Tx
13-15 minutes with the 1400 pack
15-20 minutes with the 1800 pack. both
with throttle management
||540 Sq Inch
1.372 Sq Mtr
from wing edge
Recommended 10” – 254mm from
Currently flying at 10.5” – 267mm
||No prior experience needed.
Be patient, and just follow the extremely well written
instructions. When using the recommended glues it can be done in 3 to 4
evenings. Cover either with
packing tape, or Oracover. If
you have the ability, use Oracover (or similar).
It makes for a smoother surface.
The supplied wood for the winglets and elevons is of fairly poor
quality. I strongly recommend
at least for the elevons to use different balsa right from the start.
||The “Pizza Toss” works very
well for me. Hold the Unicorn
by the nose with thumb on top, throw
into the wind with motor off as you would toss an overhand baseball.
When the Unicorn leaves your hand give ¾ to full throttle, and by
the time your throw arm is on the controls you can start a 40-45 degree
Very stable, at ½ to ¾ throttle
almost docile. Although it will
tip stall while banking steeply at low speed.
At ¾ to full throttle the Unicorn is as aerobatic as any wing, and
then some. In the right hands
it can even do 4-point rolls! Inverted
flight needs only a little bit “up”.
With the 1400 pack there is no need to pick up speed with a slight
dive at all, for any maneuver.
would say beginner to intermediary.
||Landing needs a bit of planning, because this plane just won’t stop!
Final should start way out, otherwise you’ll be doing a lot of
walking. When done well, the
Unicorn will slow down to a crawl, and then gently settle down on terra
firma. It is also supposed to
be quite easy to hand catch the Unicorn, but I leave that to those with
more experience (and better insurance).
||The wing as all EPP, and has 3 carbon fiber rods embedded in the wing, so
is nearly indestructible. I have
tried real hard! Nose-ins
from 20 meters high give a spectacular 5 meter high bounce.
||The only damage you will encounter on a regular basis, are the winglets.
Although the Unicorn will fly without them, it will not track as
good. I always make sure
there are a couple of spares in my field kit, made from 2mm balsa.
On real hard nose-ins your motor can shift forward into the motor
tube. More often than not, the propeller will just pop off
undamaged. All you need to do
is, with a pair of nose pliers, pull the motor back into place, put a new
tiewrap on, and put the prop back on.
And it is always good to have some extra tape and CA on hand.
||I have recently epoxy glued 2 sheets of 2mm balsa together, and shaped
new elevons out of this. They
came out 15grams heavier, but much stronger.
Another mod that is advisable (if you have the building experience)
is to not use the provided pushrods, but go for flexible ones (eg. Golden
Rods) This way the servos can
be close to the centerline, and further forward, making it easier to
balance on the CG. It also
enables you to place the control horns in the middle of the elevons and at
a 90 degree angle. So there
will be less chance of elevon flutter and more control.
and there are several more
threads and building threads on RCGroups.
Unicorn on it's first flight,
Monday, 20 June 2005