Sopwith Triplane N5912 1-32.pdf
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Sopwith Triplane N5912
A paper
model of
Sopwith
Triplane
N5912
Cover photo depicts N5912, one of the only two
preserved original Sopwith Triplanes, and the
subject of this kit.
[Photo courtesy RAF Museum, Hendon]
Printing advice:
The kit is formatted for A4 paper size.
Do
not
use any kind of “Scale to
t paper size” setting.
Printing at 95 percent should enable you to use US
Letter paper size. That setting will also give you a model
close to the more common 1/33 scale.
Sopwith Triplane
1/32 scale
The prototype appeared in May 1916 and
was found to be highly manoeuvrable
with a phenomenal rate of climb.
Richthofen. The triplane concept had a
brief life and in less than two years it had
been eclipsed by the new and more
powerful biplane
ghters on both sides.
Data (original):
Length:
18 ft 10 in (5.73 m)
Wingspan:
26 ft 6 in (8 m)
Height:
10 ft 6 in (3.2 m)
Wing area:
231 ft
(21.46 m
)
Empty weight:
993 lb (450 kg)
Loaded weight:
1,415 lb (642 kg)
Powerplant:
Clerget 9B rotary,
130 hp (96 kw)
Maximum speed:
117 mph (187 km/h)
Both the Royal Flying Corps and the Royal
Naval Air Service ordered the type but
policy changes led to the Triplane only
being used by the Royal Naval Air Service
on the Western Front.
Only two authentic Sopwith Triplanes
remain in existence. N5912 was one of
three aircraft built by Oakley & Co. Ltd. and
delivered in late 1917. The aircraft saw no
combat service and instead served with
No. 2 School of Aerial Fighting and
Gunnery at Marske. After the war, the
Imperial War Museum displayed the
aircraft in a temporary exhibition until
1924. In 1936, the Royal Air Force acquired
and restored the aircraft,
ying it in several
RAF Pageants at Hendon. Today, N5912 is
preserved at the RAF Museum, Hendon.
Several of the Royal Naval Air Squadron
pilots scored many victories while
ying
the type and it made such a profound
impression on the Germans that a speci
c
request was made to their aircraft
manufacturers to design and produce
triplane
ghters. Only the Fokker Dr.I was
built in quantity and it gained fame as the
aircraft frequently
own by Manfred von
at 5,000 ft (1,830 m)
Range:
280 mi (450 km)
Service ceiling:
20,500 ft (6,250 m)
Wing loading:
6.13 lb/ft
(29.92 kg/m
)
Endurance:
2 hrs 45 min
Time to altitude:
6.33 min to 6,500 ft
(1,980 m)
Propeller parts:
laminate “+”-marked
with one extra layer,
and “++”-marked with
two extra layers
for scale thickness
Engine, prop, cowling &
rewall may be built as a
separate unit. Glue
built-up engine to
metal-coloured
rewall
bulkhead. Mount
built-up cowling on
rewall, and
nally prop
on a suitable shaft.
Parts for a properly
rotating engine will
have to be devised by
the builder.
+
++
++
++
++
++
+
Cowling parts
Firewall bulkhead (++)
engine section
fuse section
Gun
parts
Crankcase:
- main part
- front parts
- rear parts
Small wire
part
for barrel
Cylinders left,
cylinder heads below
Exhaust funnel, bend inwards
See full-size
sideview on last
page for panel
position.
Laminate
bottom layer
++. Tape over
instrument
faces in that
layer with clear
tape. Cut out
instrument
faces in top
layer. Then join
the two layers.
Air intake
(goes on
each side
where
marked)
++
Instrument panel
Cockpit
coaming, make
many small cuts
and fold
inwards
Cockpit inside below; stab trim wheel on
right
side
Bulkhead
fuse
section
aft (++)
Seat
parts
Double parts marked “++” with card ca 0.3 mm or
two extra layers of the paper you use for printing.
Double all parts marked “+” with one extra layer.
The design uses the traditional method of fuselage
in three sections, joined at the engine
rewall, and
the cockpit bulkhead. Be sure to sand adjoining
formers to exactly the sampe shape. Glue tabs on
cowling sections may be dispensed with, and
sections butt-glued, or joining strips devised.
Download a very detailed
Clerget engine
1/33
scale model by Richard Schulten from:
http://home.planet.nl/~schul923/submersible.html
Download an advanced 1/33
layered prop
from:
http://www.papermodelers.com/forum/downloads.
php?do=
le&id=79
Prop parts need careful edge-colouring in two
shades.
++
++
++
Glue extra doublers
one on each side
of stab sti
ener;
sand l.e. to pro
le
++
++
++
The underside of the wings,
stab, and fuselage are clear
doped linen (”CDL”), which is
slightly translucent. That is why
the spars are marked on the
underside of the stab & elevator,
but not on the top side, which is
painted khaki green (”PC10”).
That is also why you should
score the ribs only, not the spars,
from the back (unprinted) side;
the ribs touch the covering
material, while the spars do not.
Refer to cover photo.
+
Strut
tting doublers above optional. Refer to cover
photo. Use glued-up top wing as template for aligning
wings. Dihedral is 3.5 mm each wingtip. Distance
between leading edges is equal, 31.5 mm (diagonally).
Use full-size sideview on last page to check positioning.
+
Outer strut R ++ (both)
Centre strut R ++ (both)
+
Centre strut L ++ (both)
Outer strut L ++ (both)
+
Mark positions for stab ribs and top fuselage
stringers on unprinted side (not formers or spars).
Score from the backside (only fore-aft direction)
with a very dull knife or your favourite embossing
tool. Do the same for forward fuselage part on p. 1,
but score that part both vertically & horizontally to
achieve the chequered pattern typical for the
cockpit area of several Sopwith aircraft.
For a proper wheel/tyre pro
le, laminate
“+”-marked parts with an extra layer. Paint with
glue, mixed with desired shade of grey or black,
before glueing spoke coverings in place.
Rear spar
divided
between
ribs. Note
di
erence
between
end ribs &
inner ribs.
Right lower wing
Right mid wing
Scale rib shown
for comparison
Spar & ribs required
for each wing (typical)
Mark scale rib positions, both main & nose, on the
back of the parts and score, same as the stabilizer.
Do not score spar lines on bottom of wings.
Score aileron separation lines from the printed side.
(Do the same for elevator & rudder. )
When you score to bend the wing pieces along the
leading edge, score from the backside along
several parallell lines close to each other, to help
get a nicely rounded leading edge.
When mounting the wings note the 3.5 mm
dihedral each wingtip, apparent in the three-view
drawings and the cover photo. Sand joints in top
and bottom wings before glueing them to the top
center section, and fuse, respectively.
Left lower wing
Left mid wing
Laminate
spars and
ribs with
two layers
of paper
or ca 0.3
mm card
(++).
Rigging notes:
Where rigging wires are to be
attached or pass through parts they are marked
with a dot like this: . Study the instruction
sketches and cover photo. Pre-glue long strands of
rigging wires in the wing parts. Pre-glue similar
small loops or eyelets of wire in the fuselage. Knots
made here when rigging the finished aircraft will
simulate turnbuckles which as a rule were attached
at the “lower, inner, forward” ends of rigging wires.
The rigging wires are:
1) Flying wires (double) from
the top of the outer struts to the lower fuselage
longerons, just in front of the lower wing, passing
(cont. next page)
Wrap handle
of control stick
with thread
Ribs and spars
follow the
general outline and
positions of the full-scale
original (simpli
ed sketch
above). There is no need to
make more than the four
ribs per wing indicated on
the main spar, and the rear
spar itself is optional.
Rear spar
divided
between
ribs. Note
di
erence
between
end ribs &
inner ribs.
The builder who wishes to
build a very detailed inner
wing structure can do so by
printing enough ribs and
spars on wood-coloured
paper.
Templates for wire parts:
Wheel axle & control stick
above, U/C legs below. Make
from soft
oral wire, available
in several diameters.
One wing made like this,
e.g. the mid wing on one
side, with optional internal
wire bracing and large
cut-outs in the covering, will
demonstrate the original
structure very e
ectively.
Such a full set of ribs for one
wing (plus a few spares) is
included below. A scale
drawing of the mid wing
inner structure is included
on the last page.
Right top wing
[++]
Top wing centre
section
Left top wing
[++]
Impeller & wire part
for pump (left).
Pitot tube wire
parts (right).
Fold & glue
Laminate
spars and
ribs with
two layers
of paper
or ca 0.3
mm card
(++).
Rudder horns, 4 x ailerons,
2 x elevator, rudder & skid;
fold and glue with an extra
layer inside.
++
Skid, laminate each ++ and join.
Glue top against bottom of stab.
Wire part for skid steering horn
Wheel axle
fairing (left) with
endplates (right).
Front legs
Fold leg
parts and
wheel axle
fairing
around UC
wire parts
and glue.
Rear legs
(cont. from previous page:)
through the leading edge of the mid wing.
2) Landing wires (single) from the top of the centre
struts to the bottom of the outer struts, passing
through the middle of the mid wing. 3) Drag &
anti-drag wires, from the middle of the underside
of the mid wing, to the upper fuselage longerons,
at the firewall in front, and aft of the cockpit in the
rear. 4) Centre section crossed wires from the top of
the centre struts to the upper longerons of the
fuselage at the firewall. Landing-gear wires: 5) One
crossed set from the lower fuse longerons in front
of the lower wing to the wheel axle fairing; and
(cont. next page)
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