visitor Wells S. just wrote asking for another article to be posted - this time it is a very nice scale radio controlled
Spitfire IX. As was common in the era (1962), construction is very robust and therefore heavy (10 pounds with a
64" wingspan). A Super Tigre .56 powered the model in the article, and an Orbit radio with Bonner servos were used.
My favorite line in the article is, "In flight the Spitfire is very stable but snaps through maneuvers and will
tie knots in itself if you can operate transmitter switches fast enough." We've come a long way, baby.
[Table of Contents]|
Aircraft modeling has undergone
significant changes over the decades - both in technology and preferences. Magazines like American Aircraft Modeler, and
American Modeler before that, were the best venues for capturing snapshots of the status quo of the day. Still, many things
never change, so much of the old content is relevant to today's modeler.
Whether you are here to wax nostalgic,
or are just interested in learning history, hopefully you will find what you are seeking. As time permits, I will be glad
to scan articles for you. All copyrights (if any) are hereby acknowledged.
How to Build George Harris' Magnificent Radio Controlled
of the most beautiful aircraft ever built, with all-elliptical surfaces, was the Supermarine Spitfire. Designer
was R. J. Mitchell who was also responsible for a series of racing seaplanes which included every British winner
of the Schneider Trophy races from 1918 to the end of the contests - which resulted in the outright winning of the
trophy for Britain.
The prototype Spitfire which first flew on March 5, 1936 was an outstanding success,
but Mitchell died in 1937 before his creation began the job for which it was designed. During the Battle of Britain,
the Spitfire - together with the Hurricane and greatly outnumbered - smashed the Luftwaffe and ruined Hitler's invasion
plans. While various modifications greatly improved the Spitfire, the Focke Wulf 190 appearing in late 1941 was
a serious threat. In answer to this menace a much improved Rolls-Royce Merlin engine was fitted to a strengthened
airframe to give the Spitfire IX. The most obvious changes in the Mark 9 were the lengthened nose, large "flattop"
cowling and equal size radiators under each wing.
This aircraft had a top speed of 408 mph at 25,000 feet
and a rate of climb that was most upsetting to the enemy. The Spitfire was the only Allied aircraft to remain in
production throughout the war. The last one built was an F.24 delivered in February 1948. Final operational flights
by Spitfires were in mid-1957.
Since scale modelers are a demanding bunch, the markings have been kept authentic
and several different aircraft squadron designations have been given as alternatives. The camouflage scheme and
R.A.F. markings are as applied during the appropriate period.
Originally a 70 inch span Spit built as a
test bed for this type of model flew with a Fox .59, followed by a McCoy 60. This model has made almost 100 flights
and, despite its heavy weight of 10-lbs, is very aerobatic, even in a glide. A second, smaller model to accurate
scale with full war paint proved to be even more aerobatic. So far the second, shown in the photographs, has made
113 flights. It is momentarily retired after the right landing gear leg snapped off at the bend while landing across
a deep rut.
Test pilot for the project was Ed Fitzgibbon of the San Diego Drones R/C club, who went through all the usual tricks
plus a few unusual ones. Most of the flying was with a Super Tigre .56 - but a .45 will be plenty when the structure.
is lightened as shown in the plans. When modified Hassad .65 was installed the Spit just spiraled itself up into
Real Spit Mark 9 flies with beer barrel under each wing to landing strip on Normandy beachhead soon after D-Day.
Full size plans for radio controlled Spitfire are available from Hobby Helpers as part of group #262 (see ad
Spitfires in flight.
STRUCTURE. The model is not intended for beginners, so details like control systems and equipment
installations have been skipped. Most experienced modelers have their own ideas about such things anyhow and their
equipment varies considerably.
The fuselage is built upside-down on the crutch directly on the bottom view,
the basic structure completed to a considerable degree before removal. This ensures a true alignment which is essential
in a large, fast model. The ply sides key into the formers and the separate side pieces lock the whole assembly
together, The rear formers are held erect by the bottom longeron, the main part of the planking being easily applied
in this position.
This structure is now removed from the board and the upper section added. Note that the
fin fairs smoothly into the rear fuselage with no definite break. The tailplane installed at this point rests atop
Tail construction is simple, the tailplane being covered with 1/16" sheet and the elevators
silked. On the original model the tail assembly, separate and held by rubber bands, has never been removed since
the first flight, so the drawings show it all in one lump with the fuselage. This arrangement is lighter and if
a crash is hard enough to knock the tail loose, your repairs are going to be extensive anyway. The tailwheel hook-up
should be made before completing planking; don't use anything less than 3/32" wire for the tail wheel strut. Keep
the tail light and beef up the nose to eliminate later ballast. The 1/8" planking on the fuselage may seem a little
heavy, but there is not too much inner structure and sanding will reduce it some.
A covering of fiberglass
on the nose back to the wing will help a lot in rough landings. Details such as the reflector gun sight and rear
view mirror help a lot toward realism and don't require much time to make. The instrument panel layout is shown,
but accurate dials are a bit impractical in this size, except to the real fanatic who will probably have access
to photographs of the things anyway. Cockpit framing is cut from green plastic or cloth tape and seems to stay on
very well in use. The large wing root fillets are no problem if made from narrow strips; the thin ply platform provides
a very firm support for the wing. If 1/32" ply is not available in the required size, hard 1/16" balsa can be used
with the grain across the fuselage.
Up at the front end the ply motor plate allows installation of
different motors without carving on the motor mounts. Cut the removable top cowl to fit around your particular motor,
have an ample cutout for exhaust. A large spinner as shown may be a slight problem but it can be made from fiberglass
or compounded from a small spinner with a built-up back section. The one in the photos is custom made hand-spun
Wings are best built with the bottom main spars flat on the plans, the other members packed
up with scrap to proper height. Laminated leading edges simplify curvature and are very strong. Covering the wings
completely with sheet balsa adds very little to the weight and increases strength tremendously, in addition to giving
an appearance of metal covering. The only fabric covered surfaces on the Spit are the rudder and elevators, so that's
the way our model is built. Both wings are joined and the landing gear and aileron controls installed before sheeting.
Ailerons and associated shroud inner surfaces are best painted before assembly for neat appearance. Aileron hinges
in scale position are very strong and smooth in operation. Use good strong brackets or many J-bolts to hold the
landing gear on the 1/4" ply spar joiner.
Wing radiators are realistic with insect screen inserts
to simulate cores, the insides between the screen pieces being painted black. The screen material offers little
drag and, for a gimmick, a toy whistle can be concealed in one to give a Merlin whine in flight. The tubes through
the wing fillets provide a neat solution for the rubber retaining bands without any strain on the fillets.
Cannons built around aluminum tubes are held on by short dowel plugs which are easily replaced if knocked off in
a crash. The Spitfire IX had a "universal" wing which could carry four 20mm cannons or two cannons and four .303
machine guns - most had the latter with two cannon ports blanked off.
FINISHING. Considering the stresses
involved in violent aerobatics it is advisable to hold everything together with silk covering all over, filled and
doped to a smooth consistency. The basic color of the Spitfire is gray and the true color is closely matched by
Fuller's Butyrate Dope, Aircraft Gray for the under surfaces. Dark gray for the top surface is obtained by mixing
about one part black to five parts of the gray. Incidentally, AeroGloss mixes very well with Fuller's dope which
comes in quart cans, one being ample for the Spit. AeroGloss Stinson Green is the camouflage green, the red, white,
blue and yellow being standard insignia colors. The light gray letters on the fuselage are of the basic gray with
a little white added and the spinner and rear fuselage band are a very light blue made by adding just a touch of
blue to white dope.
CONTROLS AND FLYING. My original model used Bonner servos and Orbit radio, but
the space available is ample for all the popular equipment. If you use Space Control an opening should be cut in
F3 and the servo rails extended from F2 to F5 to carry the mounting platform. The receiver can then be adjusted
fore and aft for balance. Control movements need not be excessive - the surface areas are large and the plane is
In flight the Spitfire is very stable but snaps through maneuvers and will tie knots
in itself if you can operate transmitter switches fast enough. There is no tendency to fall off in tight banks;
inverted flight is a cinch. Glide characteristics are good and stalling speed low, although the Spit should be flown
into a landing rather than just dropped and flopped. Even with that narrow track landing gear ground looping is
not a problem.
Watching the Spitfire in the air brings back nostalgic memories to those of us who
saw the real thing in action... the war paint and little details being very convincing. About the only requirement
for complete realism would be a retracting landing gear - this is planned for a near future project.
Spitfire IX Fuselage & Empennage Plans Sheet
Spitfire IX Wing Plans Sheet
Spitfire IX List of Materials
SHEET BALSA: 4 sheets, 3/32 x 4 x 36 for Wing & tail ribs, trailing edges; (14) 1/16 x 4 x 36 for Wing &
tail sheeting; (6) 1/8 x 4 x 36 for Fuselage formers & planking, wing L.E.; 3/16 x 3 x 36 for Elevator T.E.,
wing ribs; 1/4 x 4 x 36 for Wing rear spars, fin spars, rudder outline; 3/8 x 3 x 36 for Wing radiators, cannon
blisters; 1/2 x 3 x 36 for Wing radiators; 3/4 x 4 x 24 for Top cowl sides, nose sides, wing tips, rudder base block.
STRIP BALSA: 2 pieces 1/2 sq. for Tailplane spars; (7) 1/2 x 1/4 for Crutch, wing spars; (4) 1/4 sq. for
Wing rear spars, fuselage longerons
BLOCK BALSA: 1 piece, 2 x 5 x 9 for Lower nose block; 1·1-3/4 x 1 x
5 for Carb. air intake.
HARDWOOD: 1 piece, 10 x 15 x 1/32 ply for Wing platform; 4 x 12 x 1/16 ply for T.E.
fairing, canopy arch; 12 x 30 x 3/32 ply for Fuselage box frames, windshield frame; 12 x 16 x 1/8 ply for Formers,
rear spar joiners; 4 x 16 x 1/4 ply for Main spar joiners, motor plate; 3/4 x 3/8 x 24 maple for Motor mounts; 3/8
x 1/4 x 12 spruce for Servo rails; 1/4 dowel x 15 for Wing & top cowl retaining dowels.
2 pieces, 1/16 dia. x 36 for Aileron & rudder linkage; 3/32 dia. x 18 for Aileron hinges, tail wheel strut;
5/32 dia. x 36 for Landing gear.
MISC.: 1 pair 3-1/2 dia. wheels; 1-1/4 dia. wheel; 3/32 I.D. x 12 brass
tube for aileron & tail wheel hinges; 3/16 I.D. x 20 alum. tube for cannons. Elevator horn, hinges, push rods,
pilot head, canopy, plastic for windows, green plastic tape, spruce for antenna & pitot head, landing gear brackets,
nuts & bolts.
AMA Plans Service offers a full-size version of
many of the plans show here at a very reasonable cost. They will scale the plans any size for you.
It is always best to buy printed plans because my scanner
versions often have distortions that can cause parts to fit poorly. Purchasing plans also help to
support the operation of the Academy of Model
Aeronautics - the #1 advocate for model aviation throughout the world. If the AMA no longer has this plan on file, I
will be glad to send you my higher resolution version.
Try my Scale Calculator for Model Airplane Plans.
Posted on 5/29/2013