VQ Radio Control Model P-39 Q/N AIRACOBRA Building Instructions
VQ Radio Control Model P-39 Q/N AIRACOBRA is a semi-scale, almost ready-to-fly, all-balsa plane powered by a 2-cycle .40 engine or a 4-cycle .52 engine, or an electric motor equivalent. It features a 1580mm wingspan, 1160mm length, and a flying weight of 2500g. The model requires a 7-channel radio with 7 servos to control its ailerons, flaps, elevator, rudder, and retracts. The model also includes an engine mount, control horns, and linkages, and requires additional purchase of glues, tools, and optional accessories.
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40 Class 2-cycle engine 52 Class 4-cycle engine Or Electric equivalent BUILDING INSTRUCTIONS / MONTAGEANLEITUNG VQA09 / VQA091 Semi scale model RADIO CONTROLED ALMOST READY-TO-FLY ENGINE POWERED ALL BALSA PLANE SPECIFICATIONS Wingspan Length Flying weight Electric Motor Glow Engine Radio 1580mm 1160mm 2500g 650 Watt 6,5cc 2T / 8,5cc 4-T 7 Channel / 7 Servos Technische Daten Spannweite Länge Fluggewicht Elektroantrieb Verbrennerantrieb Fernsteuerung 1580mm 1160mm 2500g 650 Watt 6,5cc 2T / 8,5cc 4T 7 Kanal / 7 Servos WARNING! This radio controlled model is NOT a toy. If modified or flown carelessly it could go out of controll and cause serious human injury or property damage. Before flying your airplane, ensure the air field is spacious enough. Always fly it outdoors in safe areas and seek professional advice if you are unexperienced. ACHTUNG! Dieses ferngesteuerte Modell ist KEIN Spielzeug! Es ist für fortgeschrittene Modellflugpiloten bestimmt, die ausreichende Erfahrung im Umgang mit derartigen Modellen besitzen Bei unsachgemäßer Verwendung kann hoher Personen- und/oder Sachschaden entstehen. Fragen Sie in einem Modellbauverein in Ihrer Nähe um professionelle Unterstützung, wenn Sie Hilfe im Bau und Betrieb benötigen. Der Zusammenbau dieses Modells ist durch die vielen Abbildungen selbsterklärend und ist für fortgeschrittene, erfahrene Modellbauer bestimmt. OPTIONAL ACCESSORIES 10.5x6 for .40 - 2 cycle engine 11x6 for .46 - 2 cycle engine 11X7 for .52 - 4 cycle engine 13X8 for Electric motor. Minimum 7 channel radio for airplane with 7 mini servos .Motor control x1 .Aileron x 2 .Flap x 2 .Elevator x 2 .Rudder x1 .40-.45 - 2 cycle Extension for ailerons, flaps, elevators, rudder servo. G-46 HP Motor 5 cell 4500mAh. or equivalent. .52-.60 - 4 cycle Silicone tube GLUE (Purchase separately) Cyanoacrylate Glue Klebstoff SILICON Silicon sealer CA EPOXY A Epoxy Glue (5 minute type) Epoxy-Klebstoff (5min-Typ) EPOXY B Epoxy Glue (30 minute type) Epoxy-Klebstoff (30min-Typ) TOLLS REQUIRED (Purchase separately) Hex Wrench Phillip screw driver Hobby knife Awl Needle nose Pliers Scissors Sander Wire Cutters ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... ......................................................... Masking tape - Straight Edged Ruler - Pen or pencil - Rubbing alcohol - Drill and Assorted Drill Bits If exposed to direct sunlight and/or heat, wrinkels can appear. Storing the model in a cool place will let the wrinkles disappear. Otherwise, remove wrinkles in covering film with a hair dryer, starting with low temperature. You can fix the corners by using a hot iron. Bei Sonneneinstrahlung und/oder Wärme kann die Folie erschlaffen bzw. Falten entstehen. Verwenden Sie ein Warumluftgebläse (Haartrockner) um evtl. Falten aus der Folie zu bekommen. Die Kanten können Sie mit einem Bügeleisen behandeln. Nicht zuviel Hitze anwenden ! Drill holes using the stated 1.5mm size of drill (in this case 1.5 mm Ø) ! A B Use epoxy glue CA Hatched-in areas: remove covering film carefully Take particular care here Apply cyano glue L/R Assemble left and right sides the same way. Check during assembly that these parts move freely, without binding X Not included. These parts must be purchased separately Read through the manual before you begin, so you will have an overall idea of what to do. CONVERSION TABLE 3.0mm = 1/8” 1.0mm = 3/64” 4.0mm = 5/32” 1.5mm = 1/16” 5.0mm = 13/64” 2.0mm = 5/64” 6.0mm = 15/64” 2.5mm = 3/32” 10mm = 13/32” 12mm = 15/32” 15mm = 19/32” 20mm = 51/64” 25mm = 1” 30mm = 1-3/16” 45mm = 1-51/64” Low setting 1- JOINING THE WING Nylon wing bolt A B Rubber band (both the top and bottom) Binder clip Center line Use epoxy glue to bury the opening A B 1- Using a pencil, mark the center of the brace. 2- Trial fit the wing joiner into one of the wing panels. It should insert smoothly up to the center line marked above. 3- Slide the other wing half onto the dihedral brace until the wing panel meet. If the fit is over tight, it may be necessary to lightly sand the dihedral brace. 4- Check for the correct dihedral angle. 5- Mix up some 30 minute epoxy and apply a generous amount of epoxy into the wing joiner cavity of one wing half. 6- Coat one half of the dihedral brace with epoxy up to the center line. Install the epoxy-coated side of the dihedral brace into the wing joiner cavity up to the center line, marking sure that the “V” of the dihedral brace is positioned correctly 7- Do the same way with the other wing half. 8- Carefully slide the wing halves together, ensuring that they are accurately aligned. Firmly press the two halves together, allowing the excess epoxy to run out. Clean off the excess epoxy with paper towel and kerosene. IMPORTANT: Please do not clean off the excess epoxy on the wing with strong solvent or pure alcohol, only use kerosene to keep the colour of your model not fade. 2- SERVO WING - BOTTOM VIEW Adhesive tape 1-Cut away the covering of the wing bottom where the aileron servo goes. 2-Connect the aileron servo cord to the aileron extension cord. 3-Install the aileron servo on the servo mount. Do the same way with second wing half 3-CONTROL HORN WING - BOTTOM VIEW -Switch on the radio (trims centered) then mount the ailerons servo horn in neutral position. -The servo horn should be perpendicular to the servo YES NO Plastic control horn ..........4 2x30mm....8 ..........4 Control horn Alignment Do the same way with second wing half. 1-Depending on the position of the linkage, determine the location of aileron control horn. The horn holes must be perfectly aligned with the axis of articulation. 2-Mark the position of the “foot” of the horn on the aileron. Then, with the drill, make the 2 holes. 3-Install the aileron control horn as shown. 4- LINKAGES WING - BOTTOM VIEW 3mm set Screw Aileron pushrod D=5/64”(2mm) 2 mm X Do the same way with second wing half. 5- RETRACT SERVO TRAY CA B Retract servo mount C Retract servo mount B C BOTTOM CA Retract servo tray A CA A CENTER WING SECTION Fahrwerk servohalterung CA Retract servo tray installation Cut away only the covering Schneiden Sie etwas Folie weg 6- RETRACT SERVO Install the retract servo onto the retract servo mount and secure it in place with four screw (included with radio set). RETRACT SERVO INSTALLATION Note: The head of servo should be positioned toward the rear of the wing. X CENTER WING SECTION BOTTOM 1/16” 1.5mm Retract landing gear servo 7- LINKAGES EXTENDED AUSGEFAHREN RETRACTED EINGEFAHREN With the retract and retract servo in the retracted position, mark the position where each of the pushrod will attach to the servo arm, a small piece of masking tape works well for this. Cut off the excess length each rod. Link the servo and retract gear arm with push rod. Be sure to adjust the stroke so that the landing gear locks in both up and down position. Retract servo Retract gear Retract gear 8- ELECTRIC RETRACT ELECTRIC RETRACT LANDING GEAR EXTENDED POSITION RETRACTED POSITION ELECTRIC RETRACT LANDING GEAR ON GEAR RECEIVER OFF 2mm Bottom view /Ansicht von unten 9- FIXED GEAR 3x20mm Main landing gear 3x12mm screw ..........8 3x20mm screw ......16 2mm Nylon gear strap Ply gear mount flat 2mm Gear mount Square plastic Nylon gear strap .......4 3x12mm screw 1 2 3x20mm Gear mount x 2 2mm 3x20mm screw Ply gear mount plate x 2 4 Square plastic x 2 2mm Wing - bottom view 3 10- GEAR COVER Bottom view /Ansicht von unten CA plastic wheel well cover Plastic gear strap 2x6mm screw ..........4 4mm collar ...2 2x6 screw 50mm ....2 11- CANOPY HATCH 12- ENGINE MOUNT ! Align the mark on both mounts with the mark on the fuselage B A B’ ! Engine thrust on balk head is already adjust at factory FRONT-VIEW A - Position the top and bottom engine mounts to the fire-wall, using a pencil or felt tipped pen, mark the fire-wall where the four holes are to be drilled. 13- ENGINE MOUNT 13/64” 5mm - Reposition the engine mounts on to the fire-wall and secure them with four 4x25mm screw - Remove the engine mounts and drill a 13/64”(5mm) hole through the fire-wall at each of the four marks marked. - Attach the four blind-nut to the fire-wall as show 1/8” 3mm - Position the engine on to the engine mounts so the distance -Remove the engine and drill a 1/8” (3mm) holes through from the prop hub to the fire wall is 4.6”(118mm). - Mark the engine mounting plate where the four holes are to be drilled. the beam at each of the four marks make before. 5/32x1” 4x25mm screw ...4 - Reposition the engine on the engine mount beams, aligning it with the holes. Secure the engine to the engine mount using four 1/8x51/64”(3x25mm) screws. 14- MOTOR MOUNT SIDE-VIEW Firewall 118mm B 5mm washer...16 3mm screw/nut...4 .................4 ...4 1/8”(3mm) nut .................4 -Using a aluminum motor mounting plate as a template, mark the plywood motor mounting plate where the four holes are to be drilled. -Remove the aluminum motor mounting plate and drill a 1/8”(3mm) hole through the plywood at each of the four marks marked . Note: The aluminum motor mounting included with electric motor set. 3mm 5x70mm.......4 5mm nut.......12 Blind-nut 1/8x5-1/64” 3x20mm screw B=B’ B’ 15- NOSE GEAR Plywood nose gear plate CA CA Plastic nose gear mount Attach the plastic nose gear mount to the plywood nose gear plate using four 3x20mm screws and blind nuts. Secure the plywood nose gear plate in place using CA glue. 16- NOSE GEAR 17- STRUTS (NOSE GEAR) Struts (purchase separately) Electric retract (purchase separately) Insert the nose gear pushrod into the fuselage with the “Z” bend in front. Insert the “Z” bend into the hole on the nose gear control horn. 18- HORIZONTAL STABILIZER Cut away only the covering both sides When you are satisfied with the alignment, use a pencil to trace around the top and bottom of the stabilizer where it meets the fuselage. Note: use the thin CA glue only Glue inside the slot, where the horizontal stabilizer meet the fuselage. CA A = A’ B = B’ A 90 A’ O 90 O B B’ CA Glue the top and bottom of the horizontal stabilizer, where it meets the fuselage Slide the Horizontal stabilizer into the fuselage. When you are satisfied with the alignment, use a pencil to carefully trace around the left and right of the Horizontal stabilizer where them meet the fuselage. Note, it is important not to disturb the alignment of the stabilizer. Remove the Horizontal stabilizer from the fuselage, cut away the covering inside the lines. Not to cut into the wood. Reposition the stabilizers into the fuselage, ensuring that they are accurately aligned. Secure the horizontal stabilizer in place using thin CA glue. 19- VERTICAL STABILIZER B=B’ B B’ Insert the Vertical stabilizer into the slot of the fuselage as shown. Glue the left and right of the vertical stabilizer, where it meets the fuselage CA Cut away only the covering both sides CA Glue the bottom of the vertical stabilizer, where it sit on the fuselage. Note: use the thin CA glue only When you are satisfied with the alignment, use a pencil to carefully trace around the left and right of the Vertical stabilizer where it meets the fuselage. Note, it is important not to disturb the alignment of the stabilizer. Remove the vertical stabilizer from the fuselage. Cut away the covering inside the lines. Not to cut into the wood. Reposition the stabilizers onto the fuselage, ensuring that they are accurately aligned. Secure the horizontal stabilizer in place using thin CA glue. 20- SERVOS AND LIKAGES Petroleum jelly Thin CA glue Hinge Right elevator servo (mini servo) STABILIZER Apply a thin layer of machine oil or petroleum jelly to only the top and bottom of the trailing edge of the elevator, then push the elevator and its hinges into the hinge slots in the trailing edge of the horizontal stabilizer. When satisfied with the and alignment, hinge the elevator to the horizontal stabilizer using CA glue. Do the same way with the rudder. 3mm set Screw Rudder pushrod (Or elev. pushrod) 2 mm X Left elevator servo Elevator or rudder servo Rudder servo (mini servo) ................3 2x12mm screw ..........6 Connector ........ 3 3/8 in. (9.5mm) When you are satisfied with the alignment of the control horn mark the mounting hole positions with a felt tipped pen or a pencil. Remove the control horn and drill two 2mm (5/64”) holes through the rudder and elevator. Attach the rudder and elevators control horn using two 5/64X15/32”(2x12mm) screws and a back plate. 21- COWLING 2mm 3/32x13/32” 2.5x10mm.....4 2mm Relieve the cowl to clear the engine head 22- BATTERY&FUEL TANK AREA Throttle servo hole FUEL TANK OR LI-PO BATTERY AREA Throttle servo hole FUSELAGE - TOP VIEW 23- CANOPY HATCH 30x4mm nylon bolt ............2 Cut away only the covering 24- AERO GUN Aerogun Aerogun CA RIGHT Wing section Aerogun BOTTOM VIEW WRONG CA Wing section X 4mm 5/32” 25- CONTROL SURFACE RUDDER Aerogun 1-23/64”(35 mm) 1-23/64”(35 mm) 15/64”(6mm) 15/64”(6mm) AILERON 13/32”(10mm) ELEVATOR FLAP 13/32”(10mm) Take off 10mm (25/64”) Landing 22mm (55/64”) IMPORTANT: Flying your model at these throws will provide you with the greatest chance for successful first flights. If,after you have become accustomed to the way the P-39 flies, you would like to change the throws to suit your taste that is fine. However, too much control throw could make the model difficult to control, so remember, “more is not always better”. 26- BALANCE WARNING ! Securely install the receiver and power pack, ensuring they will not come loose or rattle during flight. Never fly before checking the Cg’s required position. 3-15/64”(82mm) Wing center section In order to obtain the CG specified, reposition the receiver and power pack 27- DECALS Note: Cut out the stickers and apply them in the proper area. Do not peel the backing paper off all at once. Peel off one corner of the backing and cut off with scissors. Arrange sticker on model and when satisfied adhere the corner without backing. Carefully peel back the rest of the backing while at the same time adhering the rest of the sticker. Try not to make air bubbles, if there are some, carefully puncture sticker (center of bubble) but not model surface with the tip of the knife or sharp pin and squeeze out the air. At curves stretch sticker and apply a little heat so that no ceases occur. Cut off the excess that is produced. 219995 Snoohs 2 ND Betty Lou “3rd” FRESNO CALIF VQA09 VQA091 VQA09 DECAL SHEET VQA091 DECAL SHEET VQ MODEL / P-39Q/N VERSION 1 VQA091 DECAL SHEET VQ MODELS. P-39 Q/N .46 SIZE IMPORTANT: Please do not clean your model with pure alcohol, only use liquid soap with water or use glass cleaner to clean on surface of your model to keep the colour not fade. WARNING Do not put in a large-than recommended engine. A bigger engine does not necessarily mean better performance. ">

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Key features
- Semi-scale model
- Almost Ready To Fly
- All-balsa construction
- 2-cycle .40 or 4-cycle .52 engine compatible
- Electric motor equivalent
- Retractable landing gear
- 7-channel radio system
- 7 servos
- 1580mm wingspan
- 1160mm length
Frequently asked questions
This model can be powered by a 2-cycle .40 engine, a 4-cycle .52 engine, or an electric motor equivalent.
This model requires a 7-channel radio with 7 servos.
The wingspan of this model is 1580mm.
The length of this model is 1160mm.
The flying weight of this model is 2500g.