WHATS IN THE BOX?
The Hangar 9 Extra 330S arrives in two boxes. The larger box contains
the balsa-and-ply fuselage, built-up balsa rudder, fiberglass painted
cowl and wheel pants, canopy, wing tube, aluminum landing gear, decal
set and a 48-page manual. The second box contains the right and left wing
panels with ailerons; these parts are individually wrapped for protection.
The left and right stabilizers with the elevators are also wrapped and
taped down for protection during shipping. Youll need to provide
an engine, radio gear, your favorite hardware and, of course, a really
cool pilot figure. Hangar 9 offers a complete, 1/3-scale hardware package
(sold separately for $149.95) thats made especially for the Extra
|The Extra 330S is designed with the rudder and elevator
servos in the tail. This is a standard setup that provides slop-free
control response and permits quick and easy adjustments to the linkage.
As with nearly all almost-ready-to-fly (ARF) planes, I began my construction
by removing the wrinkles in the covering. The Hangar 9 UltraCote did not
require much shrinking, but because this is such a large airplane, you
should allow yourself enough time to work over all the surfaces with a
covering iron. I also gathered up all the hardware necessary for completing
the plane. At the time I was building this plane, Hangar 9s 1/3-scale
hardware package wasnt yet available, so I used high-quality Du-Bro
products, all of which fit perfectly.
The manual begins with instructions for assembling the wings. You only
have to hinge the ailerons and install the servos. Because this is a big
plane, it requires two servos for each aileron. I selected the JR DS 8411
digital servo for all of the control surfaces because of its quick response
and powerful torque. I also used a JR MatchBox on each of the ailerons,
the elevator and the rudder to make it easier to synchronize the servos
for each surface. Each servo required a servo extension that I attached
firmly with shrink tubing; this will prevent anything from coming loose
inside the wing. After I had screwed the servos in tightly, I used the
methods outlined in the instructions to attach the control horns to the
ailerons. Du-Bros heavy-duty control horns were great for this application;
they make solid, reliable connections.
|The Zenoah GT-80 twin-cylinder engine is ideal for
powering the Extra 330S. The throttle servo is just aft of the firewall
for simple throttle-linkage setup.
Detailed instructions explain how to install and hinge the ailerons;
the same method is used for the elevators and rudder. The control surfaces
are drilled out for Robart hinge points. I like to use Vaseline on the
knuckles of the Robart hinges to prevent epoxy from seeping in during
assembly. I also roughen up the hinge points with 100-grit sandpaper.
It is important that the hinge pivot pins be parallel and flush with the
ailerons leading edge. Install the hinge points in the ailerons
first, and allow them to dry. After the epoxy has fully cured, I work
each hinge point back and forth until the hinge can move throughout its
full travel without resistance. Attach the ailerons to the wings using
this same method. Press the ailerons onto the wing so that there is a
1/64-inch gap between the aileron and wings hinge line. After the
epoxy has cured, deflect the surface fully until there is full travel
with little or no resistance.
The large hinge gaps on the control surfaces of the Extra 330S need to
be sealed to prevent any flutter. Hangar 9 suggests that you use a strip
of 3-inch-wide clear UltraCote that has been folded in half and ironed
onto both sides of the hinge line (wing and aileron). This method is easy
and works quite well. Sealing the aileron, elevator and rudder hinge lines
is extremely important. If you fail to do this, the resulting surface
flutter may very well cause a crash.
MODEL: Extra 330S
MANUFACTURER: Hangar 9TYPE: 1/3-scale aerobatic
WINGSPAN: 97 in.
WING AREA: 1,750 sq. in.
WEIGHT: 25.4 lb.
WING LOADING: 33.74 oz./sq. ft.
LENGTH: 83 in.
ENGINE REQD: 3.8 to 4.8ci 2-stroke gas
ENGINE USED: Zenoah GT-80
RADIO REQD: 4-channel w/9 servos
RADIO USED: JR 10X w/8 DS 8411, 1 537 and 4 JR MatchBox servos
PROP USED:24x10 Pro Zinger; Tru-Turn spinner
FEATURES: fuselage is all lite-ply and balsa construction
with built-up balsa-constructed wings, elevator and rudder; painted
fiberglass cowl and wheel pants, heavy-duty aluminum main gear,
clear-plastic canopy hatch, metal wing tube, decal sheet and a 48-page
instruction manual (including a section on flying various maneuvers)
are all included.
COMMENTS: for a large aircraft, theExtra 330S goes together
quickly. This plane is designed to be light and extremely responsive,
and it fulfills both of those ambitions quite well. The Zenoah GT-80
is a perfect engine for this plane; it allows unlimited vertical
performance and has more than enough power to pull the plane through
any maneuver with authority.
Well-thought-out design and assembly.
Manual includes setup and flying tips.
Hatch assembly can warp if youre not careful.
I centered the servos by connecting them to the receiver and turning
on the transmitter. I then hooked up the aileron control rods to the control
horns and servo arms. The wings were now finished and could be set aside;
I attached them later when I was ready to adjust all the control surfaces.
RUDDER AND ELEVATOR
Install the rudder and elevator servos in the rear of the fuselage. Each
of these servos also requires a servo extension and is held together with
heat-shrink tubing. There is a servo for the elevator on each side and
two servos (one on each side) for the large rudder. Install these control
surfaces using the same method (Robart hinges and UltraCote for the hinge
gap) as was used for the ailerons. After youve hinged the stabilizer
and elevator, attach them using two stabilizer tubes. Insert two metal
tubes through the aft end of the fuselage (just below the rudder fin),
and then slide the stabilizers onto these tubes and secure them with 4-40
bolts screwed into each tube. This method of attachment allows easy stabilizer
removal when you transport the plane to and from the field.
Attach an elevator servo to the elevator control surface on each side
of the plane. I used the new, heavy-duty control-horn system from Du-Bro
for the rudder; this is essentially a pull-pull system that uses solid
pushrods instead of wires. I used a JR MatchBox for the two elevators
and another one for the two rudder servos. It made it simple to adjust
the servos to synchronize with each other, so there wont be any
excess resistance caused by the servos working against each other. With
the installation of the tail feathers complete, I moved on to the fuselage.
Install the landing gear in the belly of the fuselage. It is attached
to a solidly constructed undercarriage with four 10-32x1 hex-head bolts.
I made the appropriate cutouts on the wheel pants and installed them,
too, along with the wheels before moving on to the tailwheel. I used screws
and two springs to attach the tail bracket to the rudder control horns
to move. This allows the tailwheel to move in sync with the rudder movement.
I found an appropriate spot on the side of the fuselage for the receiver
switch and installed the receiver and battery pack inside the fuselage.
I made 1/8-inch plywood receiver and battery trays and epoxied them in
the fuselage at the recommended locations. I wrapped the battery, receiver
and two JR MatchBoxes in foam and secured them with rubber bands. I also
wrapped the fuel tank with foam, placed it on the floor of the tank compartment
and secured it with rubber bands. I attached the rubber bands to small
cup hooks screwed into the tank floor.
Attach the canopy to the hatch assembly; use four, 4-40 hex-head capscrews
to secure it to the fuselage. I installed my custom-made 1/3-scale pilot
figure using screws and Zap-a-Dap-a-Goo II. After that had dried completely,
I sealed the canopy to the hatch assembly using RCZ56 canopy glue. Be
sure to install the canopy while the hatch assembly is attached to the
fuselage. I installed the canopy while the hatch was off the plane, and
after everything had dried, I discovered that the hatch had warped somewhat.
||Left: To prevent the fuel pick-up clunk from shifting
forward in the tank, I installed a short length of brass tube in the
internal fuel line.
||Left: With such big control surfaces, its
important to seal the hinge gap with a strip of covering material.
Be sure to securely iron the hinge gap seal into place.
Right: My intrepid pilot, complete with his Model Airplane News baseball
cap. I got this handsome guy from Vailly Aviation.
ENGINE AND COWL INSTALLATION
Hangar 9s manual supplies step-by-step instructions to install the
Zenoah GT-80 engine, and it was extremely easy to do. I bolted the engine
to the firewall with the provided four 1/4-20x1/2 hex-head screws. I made
a cutout for the throttle servo on top of the engine box and then screwed
it into place. I connected the linkage to the carburetor from the servo
arm. For safety, I installed an electronic kill switch for the engine.
This switch (which is available from RCATS) allows me to designate an
unused transmitter channel as a kill switch.
To complete the engine installation, I used a rotary tool to make the
necessary cutouts in the cowl to accommodate the engine. Following the
instructions, I also cut a large air outlet into the aft end of the cowl.
I mounted the cowl using five 4-40x3/4 hex-head screws. I balanced a 24x10
Pro Zinger prop and mounted it with a Tru-Turn spinner to complete the
Balancing a plane of this size requires two peopleone at each end
of the wing. Using our index fingers, my helper and I lifted the plane
at the balance point. Because of the detailed instructions, we only had
to adjust the position of the battery pack to balance the plane.
Although a computer radio is not required for this plane, having one
really makes the radio setup much simpler. This is especially true if
you want to use any type of computer mixing such as flaperons, rudder-to-aileron
and rudder-to-elevator which, of course, I did! I set the controls to
the recommended throws for both standard and 3D maneuvers. I also included
exponential settings that matched the prototype model setup outlined in
The Hangar 9 Extra 330S is a great-looking plane, and because of its size,
it will attract a lot of attention at any flying field. Its great flight
characteristics and handling performance make this an outstanding plane
to own and fly. If youve wanted to get into 3D aerobatics or precision
flying in a big way, you cant beat the Hangar 9 Extra 330S.