1185 mm Span
EPP Power Scale Slope Soarer
by Stan Yeo
by PHOENIX MODEL PRODUCTS
is a stylish crash resistant character scale EPP slope soarer designed
for the sport flyer looking for something different. It will fly in relatively
light winds up to very strong winds with added ballast. Whilst the inverted
performance is limited (it will perform outside loops (bunts)) this is
more than compensated for by its manouvreability and docile handling characteristics.
Building time is anything from 6-8 hours upwards depending on the care
taken and the finish required i.e. whether decorated using coloured vinyl
tape or as, like the protoype, covered in Easycoat. Tools / Materials
Required The only tools required are a modelling knife with spare blades,
a pair of sharp scissors, 180 grade Wet & Dry sanding block, a tube of
impact adhesive such as Evo-Stik, Epoxy, some runny super glue (please
observe safety precautions on packets!) and a soldering iron.
equipment used in the prototypes consisted of standard size servos for
the elevator and ailerons (single servo installation), HS300 size, a square
700mA nicad pack and a Hitec mini Rx. For the twin aileron servo installation
any mini / metal gear micro servos can be used. We recommend the Perkins
SuperTec 3002BB minis and HS81MG servos along with a Webra 6 ch. Rx /
Hitec 7 ch. Dual conversion receivers. All the items mentioned are available
from PMP. Impact adhesive is used for all 'foam' joints EXCEPT the mainspars
and the wing brace where Epoxy is used. Superglue is used for all wood
to wood joints except wing brace.
- Lightly sand the fuselage doublers with 180 grade wet and dry.
Remove dust with a small brush or vacuum cleaner.
- Glue nose & tail sections together using impact adhesive ensuring
they align with the plan!. Drill wing dowel holes in ply nose doublers
in positions marked.
- Glue nose and tail doublers in position using impact adhesive.
Note tail doubler position.
- Hot drill (Item 10) dowel holes in foam. Glue nose former in position.
Fit 5mm balsa distance pieces (2 off) and bolcks B1 & 2 (fit wing
dowels and use as a guide to get fuselage square).
- Fit elevator servo to blocks B3 & 4. Glue in position ensuring
servo is flush with the top of the fuselage but not protruding.
- Using Dorsal Fin as a dsitance piece tape rear fuselage together
and taper underside of fuselage top where it meets the tailplane as
per plan. Cut top to shape and radius corner in Fin area.
- Mark elevator hinge line on Correx tailplane and remove strip of
plastic on one side to form hinge line. The elevator hinge line is
6 whole flutes forward of the trailing edge. Push fit elevator joiner
- Glue Tailplane and Fin to fuselage and join fuselage at rear. Assemble
with glue still wet! Fit rear fuselage top, canopy and front fuselage
top. Fit Fin to Tailplane with 25mm strip CW (cross-weave) tape.
- Check which side the elevator control rod must be connected to
the elevator servo for the controls to operate in the correct sense.
- Install elevator control rod. Bore hole in foam by heating the
end 10mm of elevator control rod. Tape elevator control rod to fuselage
to prevent backlash.
- Fit fuselage bottoms (front and rear) checking that fuselage is
not bent or twisted.
- Cover fuselage using CW tape. In restricted areas such as the base
of the fin etc strip CW tape to 25mm wide. In high stress areas i.e.
under the leading edge of tailplane and above the wing trailing edge
apply EXTRA layers of tape for added strength.
- Lightly sand wing surfaces and remove dust as before. Using a SHARP
scalpel and straight edge trim spar slots to size. Unfortunately due
to restriction in the CNC foam cutting machines tapered wings produce
tapered spar slots. Remove waste from wing brace slot.
- Fit 3mm x 10mm hardwood trailing edges using impact adhesive. Ensure
that the TE is straight otherwise difficulty will be experienced in
fitting the ailerons.
- Fit top wing spars using Epoxy, cut to length and join wings upside
down (helps overcome the droop wing look). TE should be STRAIGHT i.e.
no sweep either way.
- Fit wing brace and bottom wing spars, again using Epoxy. Trim spars
to length and shape wing tips. If fitting individual wing servos cut
boxes for the servos in the wing behind the main spar. Distance from
wing joint will depend on the length of servo lead. If servo lead
is too short use servo extension leads to allow mounting of the servo
further outboard. With mini servos the servo may protrude slightly
from top of the wing. If using a single servo to drive the ailerons
mount the servo along the wing join behind the mainspars and use the
torque rods supplied. Relieve rear spar to accommodate the torque
rods to prevent binding. Using CW tape, tape torque rods in position.
- Make a rectangular template of the aileron servo(s) ignoring lugs
but allowing for output arm and cut rectangular hole(s) in wing. Servo(s)
should be a snug fit in hole. If fitting outboard wing servos use
foam block removed to restore lower wing surface and a hacksaw blade
to cut recess for servo lugs.
- Before covering the wing with CW Tape remove the aileron servo(s)
and prime the foam with a spray on impact adhesive. Hold nozzle 40
to 50 mm away from foam and allow 10 minutes for solvent to evaporate
- Cover wing with CW tape. Start by laying a strip along the TE of
each wing panel. Each strip should overlap the wing joint by 100mm
each side. This provides increased strength and stiffness at the wing
joint. Work forward, bottom first, overlapping the previous strip
by 6-10mm. At the leading edge overlap tape by 10 mm.
- Cut ailerons to size and shape aileron leading edge. The ailerons
are top hinged for twin servo installation and centre hinged for single
- Cover the ailerons, starting at TE using coloured vinyl tape or
iron on flim.
- Decorate model using stick on trim such as Protrim / Solartrim
/ Fablon or coloured vinyl tape which is available from PMP. Alternatively
an iron-on film such as Easycoat can be used (Easycoat comes highly
recommended. It is a polyester film with excellent shrinkage properties).
- Hinge ailerons using M&M Developments Sticky Hinge supplied in
kit. If top hinging use either aileron covering tape as a hinge or
the M&M Developments Sticky Hinge. Cut Sticky Hinge into 50mm lengths,
3 per aileron. If using Sticky Hinge cover hinge with tape or iron
on film (Item 10 above) to prevent ultra violet light damaging the
- Fit EPP plug into plastic spinner and glue spinner in place.
- Fit control linkages and adjust to obtain required throws (see
- Set the controls to give the following movements for initial flights:
- Elevator +/- 12mm
- Ailerons +/- 15mm
- Flaps (if fitted) +/- 5mm
- Rudder (optional) +/- 30 degrees
- Balance Point 70mm +/- 5mm from LE.
- Prototypes required 20 - 40gms of lead in the nose. It is important
that the balance point is in the correct position as final flying
trim depends on it. Check alignment of wing and tailplane and wing
to tailplane incidence (bottom of flying surfaces should be parallel).
Laterally balance wing and check that it is not twisted. If the wing
is twisted, twist back in the required direction and re-smooth covering
tape with warm iron. If model is fitted with flaperons check zero
flap is in fact zero flap otherwise performance will be impaired!
- Please remember all aerobatic manoeuvres require energy in the
form of speed to perform the manoeuvre. If the model has insufficient
speed it will fail to complete the manoeuvre or perform it half-heartedly.
Vertical or near vertical dives are not an efficient way to build
up speed. A 30 deg. dive is much more efficient. Avoid sudden control
inputs. In most cases all they do is scrub off speed and lose height.
Try to fly smoothly as not only do the manoeuvres look better but
you will be able to perform more of them before having to regain height.
With tip tanks fitted and only aileron elevator control the Tucano
spins well and takes approximately ONE turn to come out of it.
- Pay particular attention to positioning and where others are in
- If the lift is good or you are having difficulty penetrating into
wind try taping ballast under the balance point. This will increase
penetration and help the model maintain speed through the manoeuvres.
- The suggested control settings are a starting point and can be
adjusted to suit your personal tastes. Adjust the balance point so
that when the model is trimmed the elevator is more or less in the
neutral position. If the elevator control is then sluggish or over
responsive it is likely that the wing tailplane incidence is incorrect.
- The Tucano will take a lot of punishment. It is excellent for building
confidence and will add another dimension to your flying but please
remember if you take a big enough hammer to anything it will break.
Store the model away from direct sunlight in a cool place as the CW
tape degrades in UV light. Do not rest anything on the Correx tailplane
as this will deform it.
- Finally should you require further assistance or advice please
contact us either by letter, telephone, email or visit our website
(http://www.phoenixmp.com) where you will find useful information
on sloping etc.