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A Semi-Scale ARF R/C Model of the Douglas A-26 Invader
The A-26 Invader, the fastest U.S. bomber of WWII, saw
multi-national military service from 944 WWII through
975 serving as everything from a bomber, to a target
drone tug, to a Vietnam-era counter-insurgence fighter.
In an unusual event, it saw a name change from A-26
to B-26 in 948 when the B-26 Marauder was
decommissioned. The aircraft then saw some aircraft
switched back to the A-26 designation in 965. In civilian
use its services ranged from a luxury corporate trans-
port to a firefighter known as a Borate-Bomber seeing
service all the way through to 985. Indeed the A-26
proved to be a versatile design that found usefullness
through four decades of service. Today only a few A-26
aircraft are flyable. However, many remain in museums
throughout the world.
The ASM A-26 is an exciting replica of the original A-26.
Its impressive 2.3m (92 inch) wingspan and .6m (66 inch)
length results in a great flying model that is easy to see
and easy to fly, yet because of its three-piece wing, the
model breaks down to fit nicely into most vehicles. And
while we certainly do not intend for this model to be
flown or built by the novice modeler, experienced modelers will find the ASM model easy to assemble and versatile.
Wing Span: 2.3m (70ft)
Gross Weight: 2,59kg (27,600lb)
maximum Speed: 570km/h (355mph)
Made in China
ASSEMBLY INSTRUCTIONS
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FuLL-ScALE douGLAS A-26 invAdER SpEciFicATionS
Wing Area: 50m
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maximum Takeoff Weight: 5,900kg (35,000lb)
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combat Range: 2,250km (,400mi)
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ASm A-26 invAdER SpEciFicATionS And FEATuRES
Wing Span: 2237mm (92 Inches)
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Wing Area: 63.87dm
(990 Square Inches)
Length: 676mm (66 Inches)
Weight RTF: 6.6~7.9kg (4.5~7.5 Pounds)
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Wing Loading: 02~23gr/dm
Functions: Elevator, Ailerons, Rudder, Flaps, and Throttles (Retracts Optional)
Radio Required: 5~6 Channel or More with Ball Bearing Servos
Engines Required: 2x .52 Two-Stroke / .52~.70 Four-Stroke / KMS 420/05BL
Plywood, Balsa and Carbon Fibre Airframe with Moulded ABS Skins
Factory-Covered Wings and Factory-Painted Fuselage, Nacelles and Cowls
3-Piece Wing for Easy Transportation
Accepts a Wide Range of Power Systems: Two-Stroke, Four-Stroke or BL Electric
Exceptional Flying Qualities for a Twin-Engine Scale Warbird
Strong, Prebent Wire Landing Gear and Lightweight Stand-Off Scale Wheels
Generous Hardware Package
Phneumatic Retractable Landing Gear and Oleo Struts Available Separately
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(540ft
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Length: 5.6m (5ft 3in)
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Service ceiling: 6,700m (22,000ft)
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(34~4 Ounces/Square Foot)
Height: 5.6m (8ft 3in)
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Engines: 2 x Pratt & Whitney 2000hp Radials
Kit Product Number ASM005
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Summary of Contents for advanced scale models A-26 invader
- Page 1 ASSEMBLY INSTRUCTIONS A Semi-Scale ARF R/C Model of the Douglas A-26 Invader The A-26 Invader, the fastest U.S. bomber of WWII, saw ASm A-26 invAdER SpEciFicATionS And FEATuRES multi-national military service from 944 WWII through 975 serving as everything from a bomber, to a target Wing Span: 2237mm (92 Inches) drone tug, to a Vietnam-era counter-insurgence fighter.
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Page 2: Customer Service Information
Assorted Modeling Supplies (i.e., Sandpaper, Sanding Block, Aircraft Stand, Paper Towels, Etc.) optional phneumatic Retract installation x ASM Retract Set and Control System for A-26 Invader (P/N ASM-ARS05) x ASM Landing Gear Strut Set for A-26 Invader (P/N ASM-AVSS05) -
Page 3: Tips From The Pros
TipS FRom THE pRoS During the covering process, colour may sometimes smear slightly from the seams. If you see any smeared colours on the covering material, it can be quickly removed by simply wiping it off with a paper towel and a small amount of acetone. Make sure to test-fit the parts before applying glue. - Page 4 q After the epoxy sets up, apply a thin layer of 5 minute epoxy to the exposed half of each hinge, then hinge the aileron to the wing. IMPORTANT Push the aileron firmly into place to ensure that the hinge gap is as tight as possible. The hinge gap should be no more than mm (~/32").
- Page 5 IMPORTANT The flap control horn on the left wing panel should be positioned approximately 37mm (5-3/8") out from the inboard edge of the flap (measured at the hinge line) and the servo arm should point toward the root end. The control horn on the right wing panel should be positioned approximately 154mm (6") out from the inboard edge of the flap (measured at the hinge line) and the servo arm should point toward the wing tip.
- Page 6 STEp 5: inSTALLinG THE vERTicAL Fin q Test-fit and glue the vertical fin to the fuselage, using 30 minute epoxy. Again, make sure to first sand away the paint from the gluing surfaces to ensure a strong bond. STEp 6: HinGinG THE ELEvAToR HALvES IMPORTANT A plywood control horn mounting plate is installed in the bottom of each elevator half.
- Page 7 STEp 8: inSTALLinG THE ELEvAToR SERvoS And conTRoL LinkAGES q Install one elevator servo into each of the two elevator servo mounting holes in the servo tray. IMPORTANT Both servo output shafts should be toward the back of the fuselage. q Install one elevator pushrod into the fuselage, using one control horn, two wood screws and one clevis provided.
- Page 8 q Thread one clevis onto two threaded couplers, then attach the clevises into the holes that are 9mm (3/4") out from the centre of the servo horn. q Install the servo horn onto the servo, making sure that it's centred. q Hold the rudder centred, using several pieces of masking tape. q Attach the cable from the left side of the rudder tiller arm to the threaded coupler on the left side of the servo arm, then attach the length of cable from the right side of the rudder tiller arm to the threaded coupler on the right...
- Page 9 q Mark and drill a hole through the firewall for the throttle pushrod wire, then install the throttle pushrod wire onto your engine. q Double-check that the pushrod doesn't bind. IMPORTANT You will need to make a shallow bend in the pushrod wire so that it will line up with the servo arm and not interfere with the bulkhead in front of the throttle servo.
- Page 10 q Install one fuel tank into each nacelle, making sure that the top of each fuel tank is toward the top of each nacelle. The front of each fuel tank should fit into the predrilled hole in each firewall and the back of each fuel tank should be angled down enough to clear the centre wing panel when the nacelles are installed.
- Page 11 q Insert the landing gear wires into the mounting slots and secure them into place, using the four landing gear mounting straps and eight small wood screws provided. IMPORTANT The coil in each landing gear wire should be toward the back of the nacelles.
- Page 12 q Centre both the nose gear and the rudder servo arm, then connect the two cables to the inner hole in each servo arm, using the two threaded couplers, two crimp collets and two clevises provided. Use the same techniques that you used to install the rudder cables to the servo arms.
- Page 13 STEp 17: inSTALLinG THE cEnTRE WinG pAnEL IMPORTANT Below we describe the layout of the servo extensions. We've done it in a way to make it more convenient when assembling the aircraft. All the servo leads feed into the fuselage, where the receiver will be located. The servo leads then run through the centre wing panel and into each of the nacelles to plug into the throttle servos.
- Page 14 q Locate the positions of the latch pins onto the forward wing mounting bulkhead on the fuselage and the rear hatch cover support, then drill holes through the bulkhead and the hatch cover support for the pins to slide into. q Install the hatch cover and double-check that the hatch latches hold the hatch cover securely in place.
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Page 15: Balance Point
BALAncinG, conTRoL THRoWS And FLYinG TipS BALAncE poinT The Centre of Gravity (C/G or Balance Point) is 102mm (4") back from the leading edge of the wing, measured at the sides of the fuselage. The C/G can be moved fore or aft to change the flight characteristics of the aircraft; however, the C/G should never be more than 114mm (4-1/2") back from the leading edge of the wing, measured at the fuselage sides. - Page 16 inSTALLinG THE opTionAL RETRAcTABLE LAndinG GEAR STEp 1: inSTALLinG THE mAin GEAR RETRAcT ASSEmBLiES q Install the two main gear struts into two retracts, making sure that the struts are lined up straight and that the scissor links are toward the back of the retracts.
- Page 17 STEp 3: inSTALLinG THE AiR conTRoL vALvE q Install your air control valve servo and the air control valve to the centre wing panel, using the plywood mounting plate, threaded pushrod wire, clevis and four wood screws provided. Note the direction of the servo output shaft. It should be toward the trailing edge of the wing and the air control valve should be installed on the left side of the wing's centreline.
- Page 18 q Test-fit and hinge the main landing gear doors to the nacelle. When aligned properly, the main landing gear doors should be flush with the nacelle when closed and they should pivot freely. IMPORTANT You will need to cut shallow notches over the four holes that you drilled in the nacelle to recess the hinges, so that the bottom edges of the main landing gear doors can be mounted flush with the nacelle.
- Page 19 STEp 7: inSTALLinG THE noSE GEAR LAndinG GEAR dooRS q Cut two 3mm (/8") square notches in both edges of the landing gear opening, using the landing gear doors themselves to position the notches so that they are aligned with the precut notches in the landing gear doors. q Drill one 3mm (/8") diameter hole through the centre of each precut notch in both landing gear doors.
- Page 20 An opTionAL BRuSHLESS poWER SYSTEm The A-26 Invader is an excellent platform for electric power. In this section, we list the power system that we suggest, along with photographs showing the basic installation of the motors, electronic speed controls and batteries. We have performed extensive flight testing using the suggested power system and have found it to fly the aircraft amazingly well.
- Page 21 q To access the LiPO batteries, you will need to cut a hatch in the top of each cowling. Cut a hatch in the top of each cowling. Cut along the grooves in the cowling flaps, then cut up to and along the yellow and black painted edge.
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Page 24: Our Guarantee
In that Advanced Scale Models has no control over the final assembly or material used for final assembly, no liability shall be assumed for any damage resulting from the use by the user of the final user-assembled product. By the act of using the final user-assembled product, the user accepts all resulting liability.