Hobby King de Havilland Mosquito TT.35 User manual

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Assembly manual
Intended for use by intermediate fliers.
Some build and soldering experience is required.
Specifications:
Material: Fiberglass, plywood and film covered balsa.
Wingspan: 1230MM.
Length: 900MM
Scale: 1:14
AFR Weight: 1500-1800g
Motor: 3536-1200KV
ESC: 2X40A
Servo: 2x9g and 3x5g
Battery: 2x2200 mah 3S
Prop: 1Xx1045R and 1x1045L
Radio System: 4-6 Channel

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Included in the box:
Wooden and fiberglass parts:
Hardware:

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Wooden and fiberglass parts:
!Fuselage
!Canopy
!Main wings x2
!Horizontal stab x2
!Rudder
!Motor mount x2
!Motor cowling x2
!Clear plastic canopy
Hardware:
!Landing gear (wheels and struts)
!Long and short pushrods
!Long and short CF rod
!Thumbscrews x2
!Additional hardware (screws, clevises, horns etc.)
Equipment required (not included):
!4 - 6 channel radio and receiver
!2x9g servos and 3x5g servos
!Battery (2200mah 3S1P is recommended)
!Strong epoxy (~15min) and foam safe CA glue
!Velcro
!2.5mm drill bit
!Small screwdrivers and Allen (hex) keys
!Craft knife
!Soldering iron
!1 - 1.5 meters of 12AWG cable
!Various bullet connectors
!Heat shrink and heat gun
!2x 30cm servo extension leads (an additional two will be required depending on
your choice of ESC)
!Servo Y harness (for dual elevator servos)

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Step 1: Main wing preparation
Remove covering film in the locations shown below with a craft knife.
Ensure that the ailerons and aileron hinges are glued in place. To secure, use medium
viscosity CA glue to glue the hinges in the main wings such that half of the hinge
remains exposed. Place a drop of CA on the tip of each hinge and slide the ailerons in
place.
Take two 9g servos, add servo extension leads and install in the main wings. Route
wires through the wings to the exits provided. Pre drill 2mm pilot holes before securing
each servo with two woodscrews. Connect a short pushrod, clevis, control horn and a
servo horn. Trim the pushrods to the correct length. Repeat for both sides.

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Step 2: Horizontal stabs and tail servo installation
Take three 5g servos, three pushrods and three clevises and install in the fuselage as
depicted below. Note that two servos control the two elevators and one servo controls
the rudder. Do not trim the pushrods to size yet. There is also no need to secure the
pushrods in place, as they will need to be removed later in this step.
Attach the elevator control surfaces to the horizontal stabs using the same procedure
used to secure the ailerons to the main wings. Next, locate the short carbon fiber rod
and insert as depicted in the following image. Also insert the small locating pin to
ensure the correct angle of attack of the horizontal stabs.
Dry fit both horizontal stabs to ensure that everything goes together in the correct
manner.

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Before gluing these in place, roughen the surface of the fuselage to which the stabs
will attach to ensure maximum bond strength. Apply Hobbyking 30 minute epoxy to all
surfaces in contact and support using blocks or tape. Wipe away any excess glue and
allow to dry before proceeding.
Next, install control horns and the pushrods as below. Pre drill 2mm pilot holes through
the control surfaces as required. Attach a pushrod to the control horn before securing
the control horn to the elevator surface using 4 long M2 bolts and a plastic back plate.
You may now trim these pushrods to the correct length.
Note the small locating pin

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Step 3: Rudder and tail wheel install
On the top side of the fuselage at the rudder hinge point, drill a 2mm hole through the
fuselage.
Directly below this drill a 4mm hole and insert the small plastic collar as seen.
Fully insert the tail wheel strut from below and bend through a right angle in line with
the tail wheel 12mm (half an inch) above the fuselage as depicted in the image above.
Drill 2mm hole here
12mm (1/2”)

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Install the rudder and hinges as before. Note that the tail wheel strut is inserted into
the rudder to steer the plane on the ground. You may need to drill a 2mm hole
through the rudder in the correct position. Once installed add a control horn as before
and hook up the pushrod and servos.
Finally, install the small wheel onto the tail wheel strut and secure using a small collar
or a small piece of heat shrink and CA glue.

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Step 4: Motor and motor mount install
Install each wooden motor mount on the corresponding main wing. Use 30-minute
epoxy to secure. Note that the motor mounts are not identical, the photo below shows
the LHS motor mount being installed on the LHS wing.
Install a motor on the mount by bolting the motor to its supplied CNC aluminum mount
and bolting the aluminum mount to the plywood frame. Ensure that the motor is
centered on the wooden mount. Alternatively, if you motor is too big you can bolt it
directly to the wooden mount from the back as depicted below. Drill 3mm holes in the
correct location and don’t forget to use washers and M3 bolts of the correct length. In
particular, ensure that the bolts that you use do not come into contact with the
windings inside the motor.
Repeat for both sides.
Larger motors such as this
one must be bolted directly to
the plywood from behind.

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Step 5: Motor cowling and ESC install
Begin by attaching the landing gear to the reinforced motor cowling. Drill a 3mm hole
in the location shown below.
Insert the main landing gear strut into this hole and pre-drill 2mm holes for the plastic
straps seen in the image below. Note that the LHS assembly is shown below (the main
struts are also sided).
Apply 30-minute epoxy and allow to dry. Also add a large wheel and a collar to secure.

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Before installing the motor cowlings on the main wings you must make a decision as
to how you will set up your motor and ESC. You have two options, your choice of
which will depend on personal preference and ESC size:
1. (Recommended) Mount the ESCs in each cowling and extend the battery wires
into the fuselage. The servo lead of most ESCs should reach without requiring
extension. The battery leads should be only as long as is necessary. Needless
to say if you do not have any experience soldering and using heat-shrink then
seek assistance from someone who does.
2. Extend the motor wires by soldering 10” lengths of 12AWG directly to the motor
wires and soldering bullet connectors to these. This is the best option if you
have two new motors that were supplied without pre-soldered bullet
connectors. Alternatively you can make extension wires with a male bullet on
one end and a female on the other. Ensure that you use the correct size bullet.
Also, do not make the wires longer than they need to be. This is important. 10”
is a guide but this will of course vary depending on the initial length of the
motor wires. Size them so that only 40-50mm (1.5” - 2”) protrudes from the
main wings.
Attempt the first method to begin. Fit your ESC on the outside of the wooden motor
mount and dry-fit the cowling. If the ESC and motor mount foul then determine if the
ESC will fit inside the wooden mount. You will need to remove a small amount of wood
using a craft knife. If not you will need to proceed with the second method.
These motor cowlings are secured to the main wings using three screws as depicted
below. To finish this step, add props and spinners to each motor. Ensure that each
prop rotates in the correct direction. If not, swap two wires between the motor and
ESC.

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Step 6: Main wing attachment
Insert the long CF rod into the fuselage and into each main wing. Secure each wing to
the fuselage using a thumbscrew.

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Step 7: Finishing touches
Cut out the vac-formed plastic canopy and glue using CA to the nose of the model.
Install your receiver and battery packs. Connect the elevator servos to the one
channel using a Y-harness or create a slave channel on your radio if it has the
capability. It is suggested that you use an individual battery pack for each motor/ESC.
Install these in the nose of the aircraft. Secure all components using Velcro.

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CG location:
The correct location for the CG is shown below.
Important:
•Pre-flight adjustment and trimming must be done before flying. Check that all
linkages, nuts, servo horns, linkage nuts and screws are tightened.
•Ensure the flying field is spacious and safe to fly. Bench test the electronic
power system on load for 1 minute.
•Check all electronic equipment. Range-check the radio equipment. Test all
control surface are moving in their assigned directions before each flight.
•Check battery voltage before use, even the batteries are recently charged.
•After the first flight, it is prudent to check the CG for all subsequent flights.
Plane should balance
when lifted here