Construction
The wing is one-piece in Carbon, with an ultra high modulus spar.
The outer layer is 125 gram very high-density twill weave carbon
biased at 45 degrees. Inside the Balsa or Herex sandwich is a layer
of 200 gram plain weave carbon again biased at 45 degrees. The spar
is set into the sandwich just below the outer layer of carbon, and
is tapered from centre to tip. The off cuts from this ultra high
modulus unidirectional carbon are not wasted but incorporated in
a tapered fashion into the D-box area of the wing. Flaps and ailerons
are used, and have wipers. Torsionally both the wing and its control
surfaces are very stiff. Care is taken to keep the control surfaces
lightweight yet strong to resist flutter. Heavy control surfaces
are bad!
The fuselage is primarily constructed in glassfibre. Carbon reinforcement
is used in the large diameter tailboom, and the result is very
stiff. The one-piece V-tail is bolt-on and resides in a decent
sized seat, meaning the entire tail-group is very solid with no
possibility of movement in the air. The heavyweight glass construction
also is transparent to radar and allows the noseweight and radio
equipment a better chance to reflect the radar emissions from the
gun and get you that personal best! A rudimentary radar reflector
is also fitted in the most forward part of the nose. So far the
model is showing up very well on the gun, but the reflector experiments
are ongoing and new designs of reflector will be tried and incorporated
if proven better.
Flying
The DS Falcon flies smooth but responsive. So far at beyond 200
mph no signs at all of loss of control authority, bunting or tucking-under
or bending, or “squirrelly” behaviour has been seen,
or even hinted at. Quite often DS specific slopes only offer tiny
landing zones or “front side” landings. The Falcon’s
crow-braking is strong, allowing the model to be landed in small
areas. So far no landing zones have troubled it. Given the amount
of heavyweight carbon in the lay-up, the wing loading is quite a
bit higher than you’re average 2 metre sport model. None the
less it shows no adverse traits. However being an efficient model
it will fly in quite light lift, but that’s not what its intended
for! I designed it to operate reliably at beyond 200 mph, which is
not an “average” flight envelope for the vast majority
of RC aircraft.
|
|
|
click
on any image for a larger version
|
|