PRO-DESIGN Twin User manual

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F22 Twin 68mm EDF
High performance Fiberglass F22 for twin 68mm electric ducted fan
Specifications are subject to change without notice
Warning !
This model is not a toy and please read the manual carefully before construction and
operating this model aircraft.
Specification
• Flying Weight ~3700g
• Wing span 862mm.
• Length 1184mm.
• Rotor diameter 68mm

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Radio system for 4 channels or above
2x Electronic speed controllers for brushless motor
2x 70mm fan-units
2x 700W size brushless motors
4x Servo extension wires
2x Metal gear standard size servo, for elevator
2x 9g servos for ailerons.
5 or 30 minute epoxy, CA Glue
Velcro.
Locktite/ threadlock
Drill , drill bit 2mm, 3mm
Dremel tool
Plier/cutter/ Philip screw driver
2mm , 3mm hex driver
Scissor

Tools needed
Equipment and parts needed

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Fuselage, Main wing, Exit ducting sheet, elevator , EDF cover, vertical fin, wing joiner,
landing gear and wheel, canopy, hardware bags ( screw, horn, linkage connector, M3 nut,
steering arm, 3mm collar, mounting plate, magnet), Elevator control hub . Waterslide décor.
Find a pre-cut slot at the underside of the wing and cut open the film. Insert the aileron servo
and pass the wire through the hole. You may use servo extension wire. CA the aileron to the
wing. Before gluing the aileron servo, center the servo horn by means of a servo tester or
Inside the Box
Aileron Servo

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with a receiver/ transmitter. Install the servo with the balsa wood block provided. Mark the
horn insertion and cut a 5mm slot in the aileron and epoxy the control horn. Use CA to
connect the aileron to the wing. Connect the 9.5cm linkage wire to the servo horn.
Do not glue the wing at this point. Try fitting the wings to the fuselage with the wing joiner.
Two joiners are used in each side. The thicker part of the wing joiner goes into the wing.
Adjust and orient the joiner such that both wings are in perfect position. A 5mm hole can be
drilled on the side to pass the wire of the aileron servos.
The wing joiner is made of fiberglass and this guarantee no risk of wing breakage at high
velocity. Sand the surface of the contact area to maximize bonding strength.
Glue the main wings with epoxy, tape or clamp the wings firmly to the fuselage. Support
the wing with blocks if necessary. Check for horizontal and longitudinal symmetry.
Main Wing
Main Wing

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The full motion elevator needs attention when assemble. The pro-design kit includes a
elevator hub that renders the elevator movement precise and maintenance free.
Use coarse sandpaper to remove excessive paint on the elevator control rod.
Make a slot on the control rod with dremel . Try assembling the collar. Make sure the collar
with the M3 screw and control horn can lock the elevator rod without slop.
Try fitting the elevator into the fuselage and the elevator hub. Adjust the best alignment in
different axis. Ensure the elevator have enough clearance from the fuselage. Use a 3mm
collar as a spacer between the elevator and the fuselage. Check symmetry on both sides.
Insert balsa block under the hub. Apply sufficient epoxy around the control hub.
Elevator
Elevator Control Hub

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Locktite the collar control arm through a hole drilled on the fuselage.
Connect the 15cm control link to the servo control arm. Install standard size metal gear
servo. Connect the linkage. Install the linkage connector and center the servo horn.
Make the exit ducting with the temple provided. Cut the template and try fitting the EDF
unit. The calculate length is 20cm with exit area equals 85% of fan sweep area. Exit
diameter is 55mm. Adjust the exit diameter to your favor. Smaller exit diameter may
sacrifice thrust for terminal speed.
Exit Ducting
Elevator Servos

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Attach double sided adhersive tape around both end of the EDF housing. This is to make a
better seal to enhance the EDF efficiency. Assemble the ducted fan unit and anchor the
ESC.
Check the inflow duct clearance. Test run the EDF and ensure air is blow backward. Check
for any excessive vibration.
Apply sufficient glue so that there is no air leakage.
Drill holes and epoxy the magnets in the canopy and the EDF compartment cover.
EDF cover
Ducted Fan Unit

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Main landing gear assembly. Connect the wheel collar. Use 2mm screw to connect to the
fuselage retractable gear base. This design allows you to upgrade to retractable gears
without any modification.
Assemble the front gear as shown. Use a 3mm collar at the base. Tighten the steering
control arm. Connect the linkage connector to the steering servo (Rudder Channel)
The height of the front gear is adjusted by the 3mm at the bottom. This is critical for runway
take off. The Wing incidence, the attack angle of the main wing to the runway path, will be
one of the factors for the take off distance. It should be slightly positive when the aircraft is
battery loaded.
Main Landing gear
Front Landing gear

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Trial fit the vertical fin first. Sand the contact areas and apply epoxy. Install the fin and confirm
symmetry on both sides.
Realistic water decal is supplied with the ProDesign kit. Cut the water decal into reasonable
pieces and soak in water for 2 seconds. Use your finger to slide the decal in position. Use
tissue paper to remove excessive water.
Decals
Vertical Stabilizer

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Trim the canopy and glue inside the fiberglass frame. Drill 4mm hole at front of the cockpit.
Epoxy the 3cm FG rod in the front. Glue the magnets to the canopy.
The neutral position of the elevator should be the same horizontal level with main wing.
The above photo shows the down elevator stick/ pitch up at low rate.
Elevator throws 15 mm up 15mm down. Use 50% exponential. Low rate 10mm.
Ailerons throws 13 mm up 13 mm down. Use 30% exponential. Low rate 10mm.
Control Throws
Cockpit

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The idea C.G. position is 9cm behind the leading edge measured at where the wing meets
the fuselage. Adjust the battery position to obtain the correct C.G. Check the C.G. before
flying.
C.G. setting

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Assistancefromexperiencedpilotisnecessaryforbeginners.
Pre-flightadjustmentandtrimmingmustbedonebefore flying. Check all
linkage, nuts, servo horns, linkage nuts and screws are tightened. Make sure
thread lockers are applied.
Ensuretheflyingfieldisspaciousandsafetofly.
Benchtesttheelectronicequipmentonloadingfor5minutes. Check
temperature of the ESC, BEC and battery. This is to ensure the power
system and the BEC are reliable. All EDF should be run in to test for
vibrations and loosen shaft.
Checkallelectronicequipment.Rangechecktheradio equipment. Test all
control surface are move in the assigned direction.
Checkbatteryvoltagebeforeuse,eventhebatteryare recently charged.
Atthefirstflight,itisprudenttochecktheC.G.
Inrunwaytakeoff,slightfingerpressureatthetrailing edge of the elevator
should be able to pitch up the aircraft.
Enjoy!
Take pictures and vid eo of your sc ale looking,
high performance ProDesign fighter!
Warning for pilot

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Ducting Template