Stunting "Vickers Wellesley"
Designer Walter Musciano has come up with a true flying scale
control line just perfect for doing the stunt pattern!
Large semi-scale stunt models are currently favored by a big
segment of experienced stunt enthusiasts. Modified Stukas, P-40's,
Spitfires, Mustangs, and similar planes are winning many contests
because their performance is equal to the specially-designed stunt
model plus the fact that their scale-like configuration and coloring
accumulate many additional points.
The author has, for many years, been an exponent of scale-stunt
and scale-speed models. In 1948 we designed and constructed a 60
inch span 3/4" to the foot scale model of the "Vickers Wellesley."
Performance of this exact scale model equaled that of any specially
designed model. A 30 inch model of this plane was constructed and
flown in 1953; this craft occupied a chapter in the author's book
"Building and Flying Scale Model Aircraft." Powered by an .099 engine
this small model almost equaled its big brother in performance.
Numerous model builders who read this book have either requested
that plans of a larger model be published or have enlarged the model
themselves to "man-size" proportions. It was this favorable reaction
to the "Vickers Wellesley" that prompted the presentation of this,
our third "Wellesley."
The real "Vickers Wellesley" was developed as a long range torpedo
bomber, reconnaissance, or general purpose craft a few years before
World War Two. A new type of light weight "Geodetic Construction"
was employed and it contributed considerably to the success of this
airplane. This consisted of a criss-cross diagonally braced basket-type
structure covered with fabric. Major disadvantage was its inability
to be adapted to mass production which automatically spelled its
doom during the early days of WW-2.
The "Wellesley" crashed the aviation headlines when a Bristol
"Pegasus" XXII engine-powered version established a world's record
for long distance, non-stop flying on November 8, 1938. A distance
of 7,158 miles was covered in this flight from Ismailia, Egypt to
Port Darwin, Australia.
All service "Wellesleys" were powered with the Bristol "Pegasus"
XX engine. They were capable of a speed of 228 mph and a range of
2,590 miles with a full bomb load. Landing speed was a mere 57 miles
per hour, ceiling was 35,250 ft.
Any engine from .23 to .59 cubic inch displacement can power
this model successfully. A .35 is the ideal powerplant for all around
good stunting. Wing area is 420 square inches which is in line with
many of the contemporary specially-designed stunt contest winners.
The wing builds first. Cut the hard balsa spars to length, firmly
cement them to the 1/4" plywood joiner. While this dries ribs should
be cut to shape.
It will be noted that only a root rib and tip rib are shown on
the plans. Trace and cut these to shape. All other ribs are easily
made by cutting oversized rectangular blanks from 1/8" sheet balsa
and then pinning these blanks between the root and tip ribs. Carve
these assembled blanks until they are in line with the root and
tip rib. Sand well and cut notches for the spins. Wedge all ribs
between the spars being sure to fit the spars into the notches.
Cement well. Follow this with the hard balsa leading edge and sheet
trailing edge pieces.
The area behind the spars between the ribs is covered with a
1/8" balsa web. This should run up to the top of the upper spar
and the bottom of the lower spar. Cement the webs well.
Cut the plywood landing gear foundations and fit these into slots
cut into the ribs. Cement well. Bend the wire landing gear and bind
and solder the pieces together. Sew this to the plywood using strong
thread. Smear several coats of cement around this installation.
The bellcrank is mounted between two hardwood pieces by means
of a steel bolt. Use washers to center the bellcrank in place. Install
the control rod and leave the length oversize. Holes for the lead
out lines can be made with a leather punch or can be turned through
by means of a hot nail. Add the lead out lines now.
Cover that portion of the wing forward of the spar with 1/16"
sheet balsa on both upper and lower surfaces. The wing root is also
covered with balsa. Add the 1/16" X 1/4" balsa cap strips on the
upper and lower edges of the ribs as shown. Add the balsa wing tips
now. Be sure to add weight to the outboard tip and aluminum tubes
to the inboard tip.
Sand the wing well and cover with silk. Apply several coats of
clear dope and set aside to dry.
Cut the keel to shape and cement this onto the wing. Follow by
cutting the horizontal tail and firmly attach the control horn.
Hinge the elevator to the stabilizer and cement the stabilizer into
the slot in the keel. Attach the control rod to the horn and solder
a washer to it as the plans illustrate.
Cement the fuselage formers to the keel, add the engine mounts
and fuel tank and plank the entire fuselage with 1/8" x 1/4" balsa
strips. Sand well.
Add the fin and rudder and apply as many as twenty coats of wood
sealer for a good finish. Apply clear dope to the silk until it
is well sealed and taut.
TThe drag ring type cowl is made from rings of 1/4" sheet balsa
which are laminated crossgrain and sanded to shape when dry. Do
not cement this in place until after the engine has been installed.
The full size "Wellesley" was colored sand and spinach (brown
and green) on all upper surfaces while the bottom. was either very
light sky blue or. jet black. Apply as many coats as are required
to obtain a good finish. We used six coats.
Bolt the engine in place and cement the cowl in place. Paint
the cowl. The two bubble canopies are Berkeley P-47 canopies cut
down to fit our model. Cement these in place and add the frames
with colored dope and masking tape.
Flying can be conducted on extra long flight lines. We fly models
this size on lines well over eighty feet long. It is, however, advisable
to handle the first few flights on shorter lines.
List Of Material
Four 1/8" x 3" X 36" of med. balsa for wing ribs, spar webs,
fuselage formers; (7) 1/16" x 3" x 36". med. balsa, wing root &
leading & trailing surface covering; (3) 1/4" x 3" x 36", hard
balsa, fuselage keel, empennage, cowl, wing tips; (4) 1/4" x 1/4"
x 36", hard balsa, wing spars; (10) 1/16" x 1/4" x 36", med. balsa,
rib cap strips; (2) 3/8" 1/2" "18", maple or other hardwood, engine
mounts; (24) 1/8" x 1/4" X 36", med. balsa, fuselage planking; (1)
1/4" x 1/4" x 12", hardwood, elevator joiner; (1) 1/4" x 3" x 12",
plywood, wing spar joiner; (1) 1/8" 4" x 18", plywood, landing gear
foundation, bulkhead B; (1) 3/32" dia. x 36", music wire, landing
gear, control rod.
Miscellaneous: Cement, medium green dope, brown dope, light blue
or black dope, bellcrank, control horn, wheels, washers, sandpaper,
silk, clear dope, brushes, transparent bubble canopies, fuel tank,
fuel line, straight pins, decals (TrimFilm or Flex-cote).
Posted , 2018