Instructs_NF21.pdf

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History
The De Havilland Sea Hornet was conceived as a carrier capable variant of its
land-based counterpart, the De Havilland Hornet F.3. The Sea Hornet retained all of the
basic design features of previous Hornets, such as early composite design that mainly
exploited wooden/alcad construction, which is directly descended from the De Havilland
Mosquito line of aircraft. Modifications for carrier operation included slotted flaps for
better handling at lower airspeeds. Among other improvements was reinforced landing
gear with conventional hydraulic oleos, airframe longerons to absorb the landing shock
loads, and Lockheed designed folding wing mechanisms. The NF.21 was designed as a
tandem seat radar equipped night fighter version built to replace the aging Fairey Firefly
NF1. Though a superb fighter in it’s time, it enjoyed a relatively short operational history,
in no small part due to the rapidly developing jet fighters in the early 1950s.
The (land based) Hornet prototype made its first flight in July 1944. The Hornet
was designed primarily to be a long range strike fighter to be used against Japan in the
Pacific Theater. The main design focus of the type was ease of control and good pilot
visibility. Operational performance was another main design point, as thus was given a
pair of Rolls Royce Merlin Slimline engines, which both maximized power and minimized
frontal drag. The powerplant pair were counter-rotating, or ‘handed’ to minimize critical
engine performance tendencies and reducing adverse yaw. The cockpit was un-
pressurized and was protected by both an armored windscreen and armored cockpit
structures. Standard armament for all Hornets were four Hispano Mk. V short barrel
20mm cannons, mounted in the nose.
The first Sea Hornet flew in April of 1945. Sea Hornets were attached to a variety
of Naval Squadrons, but only 801 squadron flew the type exclusively. All Hornets and Sea
Hornets were withdrawn from service by the summer of 1956. Though 79 Sea Hornets
NF.21s were built, no examples exist today.
Specifications-Sea Hornet NF.21
Length
Wingspan
Height
Basic Empty Weight
Max Ramp Weight
Engine
Fuel Capacity
37' 0"
45'
14'2"
14,781 lbs
19,531 lbs.
(2) Rolls Royce Merlin 133/134 (Derated) Engines
2030 BHP each, at 1,220 Prop RPM
Internal-411 US Gallons (1,557 L)
External-2(240 US Gallons) Drop Tanks (1,818 L)
Total: 891 US Gallons
4-Hispano Mk. V 20 mm cannons, 120 rounds each
4-60lb Unguided Rockets
425 MPH (Loaded) 459 MPH (Empty)
2,995 Miles
36,500 Feet
Armament
Max Speed
Range
Absolute Ceiling
Building Instructions
Note: This model does not include the use of mating strips in its
construction. It is designed to utilize the ‘butt-glue’ method of construction.
However, if you prefer, mating strips can be easily made and adapted to
this model. Simply add about 1/2 inch around fuselage & engine parts
before cutting the part out. Once the part is cut free the remaining scrap
forms a decent mating strip to be modified to your preference.
Cockpit (Part I)
1.
2.
Begin by cutting and folding the cockpit floor structure, CP1.
The Instrument panel comes in two sections. First use a punch to cut out the
panel frames from parts CP7B, CP12B, CP8B, & CP9B. Do not fully cut the
parts free from the sheet yet.
Next use spray adhesive to cover the backs of these parts with gages &
dials.
Glue clear acetate sheet to the backs of these parts.
Add the dials, CP7A, to the back of CP7B.
Add the dials, CP8A, to the back of CP8B.
Add the dial, CP9A, to the back of CP9B.
Add the dial, CP12A, to the back of CP12B.
Shape and glue into place the completed CP7B to the cockpit floor, CP1.
The Main panel will be next. Glue CP8B, to the floor, CP1. It should be
supported from behind with CP7B.
Fold & assemble CP12B, the center console.
Glue CP12B to the floor, CP1. It should sit exactly in the center of the panel
on the floor.
Next add the left console, CP9B. Fold and add it to the left side of the main
panel, CP8B.
Add the right console, CP10. It should be framed by the main panel, CP8B,
on the front, and the main floor rear wall of part CP1.
Add the left rear console, part CP11. It will be framed by CP9B in the front,
and the main floor rear wall, CP1, at the rear.
Next add the rudder pedals. First install the supports, parts CP5, (4) to the
cockpit floor, CP1.
Add the pedals, CP6 (2) to the supports, CP5. There should be two
supports to each pedal. The pedals should sit about 2mm above the floor
to achieve a more accurate look.
Build the cockpit main oxygen tank. Start by building the support, part
CP15A. Glue it into place on the 1
st
rearward blank area on the cockpit
floor, part CP1.
Roll and assemble the tank itself, part CP15B. Once dry, align and add it to
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
the top of the support, part CP15A.
20.
Add the filler spout. Layer parts CP15C, & CP15D to the top of the tank,
part CP15B.
21.
Add the radio boxes. Fold and assemble CP17 and CP18.
22.
Add these parts to its corresponding blank area at the rear of the cockpit
floor area, part CP1.
23.
Next add the control stick. Start by rolling up the main torque tube, part
ST1. Cap it off on the left side with ST2.
24.
Add the main shaft, part ST3 to the torque tube, ST1. Use the diagram for
alignment.
25.
Add the roll hinge, part ST4 to the top of the main shaft, ST3. Note that the
stick roll hinge should arc TOWARDS the panel, not towards the pilot.
26.
Next add the stick handle, part ST5 to the top of the roll hinge, part ST4.
27.
Fold and assemble the top of the stick, part ST6. Add it to the top of the
handle, part ST5.
28.
Add the shaker, part ST7, to the front of the stick cap, part ST6.
29.
Align and glue into place the completed stick to the right console, part
CP10.
Cockpit (Part II)
1.
2.
3.
4.
5.
Now to add some structure to the cockpit assembly. Align and glue W3* to
the front cockpit wall, CP1.
Behind bulkhead W3*, beneath the floor at the fold line, add W5*. It
should glue directly to the lower rear of bulkhead W3*.
Add the center nose bulkhead, by aligning and adding part W4* to the
center of parts W3*.
Align and add the front bulkhead formers, W1* & W2* to the center
former, W4*.
W6* should be glued under the cockpit floor, CP1. It will sit at the rear floor
area where the first bend uppward occurs to support the oxygen tank. You
may want to add heavy card gussets to the front of the part so it stays a true
90 degrees when inserted into the fuselage later.
No more of the cockpit can be completed at this time. Doing so will cause building
problems later in construction. Set cockpit assembly aside.
Fuselage (Part I)
1.
2.
Some prep work needs first to be done. F4, F5 and F6 have interior parts to
be added to them before continuing.
Cut out part F4. Begin by spraying the reverse side with a light layer of
matte black spray paint. This will mask any gaps that may later occur
between the interior walls and the cockpit floor.
On the matte black side, align and glue CP2#.
Once completed, roll and assemble the fuselage section F4.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
Cut out part F5. Begin by spraying the reverse side with a light layer of
matte black spray paint. This will mask any gaps that may later occur
between the interior walls and the cockpit floor.
On the matte black side, align and glue CP3#.
Once completed, roll and assemble the fuselage section F5.
Cut out part F6. Begin by spraying the reverse side with a light layer of
matte black spray paint. This will mask any gaps that may later occur
between the interior walls and the cockpit floor.
On the matte black side, align and glue CP4#.
Once completed, roll and assemble the fuselage section F6.
Next cut out and assemble the nose sections, F1, F2, & F3. Align and glue
these together (in sequence) and end it with part F4.
From the inside, glue the gun barrels into place, G1L, & G2L on the left
side, and G1R & G2R on the right.
Next add the front cockpit segment, part F5.
Last align and add the rear cockpit segment, part F6. Note that the cutout
for the main spar must be removed from this part.
Now the cockpit assembly must be added in order to continue. CAREFULLY
align and slide in the (thus-far) completed cockpit assembly through the
rear of part F6. Once satisfied with the alignment & fit, glue into place and
allow to dry.
Rear Cabin
The rear cabin served as the radar operator’s cockpit. It is built partly of interior
parts, internal bulkheads, and the external fuselage segment, F7.
1.
Begin by spray painting the reverse side of F7 with matte black before
rolling and assembling. Also carefully and align the interior walls F7A# to
the inside of the painted F7. Note that the rear cabin can be made with the
lower door open or closed. If you plan to leave it closed, simply glue MC18
to the floor, and MC17 to the bottom of F7, covering the seam. If left open,
cut and remove the door outline of F7 first. Then use parts MC18 and
MC17 to construct the door and add it later in construction.
Install bulkhead W7* to the rear of F7.
There are two bulkheads to consider at the front of the rear cabin. First, cut
and install W6A* to the rear of F6. Note that this bulkhead is distinct from
the rear cabin itself. It sits at a slight angle and will be used later to align
and connect F6 to F7.
Cut and remove bulkhead MC1*.
Before proceeding to install MC1*, first construct the seat. The upper
cushion is constructed of MS2. Assemble and glue into place. Note that
there are two sets of seat belts included with the kit. Drape the long belts,
B1, and B2 from the top of the seat.
The lower cushion is constructed in three parts. MS1R and MS1L are the
2.
3.
4.
5.
6.

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