AIRFIX A20005 User manual

Jet Engine
A20005
A Product Hornby Hobbies Limited, Margate, Kent CT9 4JX UK Tel:[phone] www.airfix.com
Batteries required:
4 x 1.5 V - (Not included)
Hornby Hobbies 4/A20005A - R1 0610
Please retain these instructions and the address for future reference

Identify all the component parts
and study the assembly sequences
thoroughly before comencing
assembly of the Jet Engine
Remove the plastic parts from the
plastic runners as they are required
Remove any burrs from the plastic
parts when separating from the
plastic runners to assist when
assembling
Study the assembly sequences for
the electric components to battery
box to ensure the electric cables
are correctly installed and
connected for the successful
operation of the power control unit,
fan motor and nacelle light unit
Tools required to assemble the kit
Kit Parts - Engine Fan Blades
Kit Parts - Engine Turbine and Compressor
Blades - Numbers 1 and 2
Kit Parts - Engine Turbine and Compressor
Blades - Numbers 1 and 2
Leave components on the sprue
until required.
1
2
2
1
3
SHORT BLADES
LONG BLADES
3
Battery Safety Guidelines
Used correctly, domestic batteries are a safe and dependable source of portable
power. Problems can occur if they are misused or abused – resulting in leakage
or, in extreme cases, fire or explosion.
Please follow these simple guidelines to eliminate the possibility of such problems:
Only use good qualityAlkaline batteries. To fit the batteries, refer to the instructions and
the diagram inside the battery compartment. Make sure battery compartment lid is
firmly secured.
Do not use re-chargeable batteries.
Do not short-circuit battery terminals.
Always take care to fit batteries correctly. Observe the plus and minus signs on
the batteries and in the battery compartment.
Always replace the complete set of batteries at one time, taking care not to
mix old and new batteries or batteries of different types.
Always store unused batteries in their packaging and away from metal objects
which may cause short-circuits.
Always remove dead batteries from equipment. Remove batteries from
equipment which you know will not be used for a long time, otherwise the batteries may
leak and cause damage.
Always supervise children if they are replacing batteries themselves to ensure
these guidelines are followed.
Always make sure that battery compartments are secure.
Never dispose of batteries in a fire as this can cause them to explode.
Never attempt to recharge ordinary batteries as this may cause fire or explosion.
Waste electrical products should not be disposed of with household waste.
Please recycle where facilities exist. Check with your Local Authority or retailer
for recycling advice.

Kit Parts - Securing screws and Instrument Panel Sticker
Kit Parts - Circuit board and voltage regulator,
power switch and fan motor
Kit Parts - Battery cover, pylon half, plug, engine spindle
spacers and washers and battery terminals
5
Assembly sequence 64
Assembly sequence 65
Assembly sequence 66
Note: Batteries are not supplied
Four batteries,1.5 volt - size C, are
required to operate the completed
Jet Engine model
To ensure a power suppy to the
motor, the batteries must be
correctly installed into the battery
compartment as indicated
Push the securing bolt, for the
battery box cover plate, through the
hole in its lower lug.
Turn the cover plate over and place
the clear retaining washer onto the
bolt to secure the bolt to the cover
plate
Push the locating lugs of the
battery box cover into the locating
holes of the battery box/base plate
jet engine
28

jet engine
Assembly sequence 58
Assembly sequence 59
Assembly sequence 60
Assemble the engine turbine/
compressor blades unit into the
outer engine casing half.
Assemble the inner engine casing
half onto the outer engine casing
half aligning the screw holes.
Note: The inner casing half has a
locating lug to ensure correct
positioning into the inner engine
nacelle half.
Secure the two engine casing
halves with four screws, and at this
stage check that the fan blades spin
freely by blowing on them.
NOTE: If they do not spin freely, it is
because the fan blades have been
fitted too tightly together on the
spindle, so remove the casing and
gently ease the fan blades further
apart.
Blades must have “end float” when
in position.
26
Assembly sequence 1
Assembly sequence 2
Assembly sequence 3
Locate the push button into the top
cover with the cut-out positioned
to the top of the push button
Locate the switch unit over the top
of the push button and secure the
switch with two screws
Overview of the switch and button
assembly secured inside the top
cover
7

Assembly sequence 7
Assembly sequence 8
Assembly sequence 9
Position the lever arms, voltage
regulator and circuit board into the
base unit
Push the lever slides onto the lever
arms
Overview of the electric cable connections
between the base unit and base cover after
assembly
Connect the RED wire from the voltage
regulator (speed control) to battery terminal
“B” with the nut and screw provided.
Connect the BLACK wire from the starter
switch to the BLACK wire from the voltage
regulator (speed control) by twisting together
and covering with sleeve as shown in
sequence 10.
Connect the red wire from the starter switch
to battery terminal “C” with the nut and screw
provided.
(Nut and screws connections are to be used on wires
with ring terminals.)
See assembly sequences 10 to 18 for the correct
method of connecting the electric cables
A
CB
RED RED
RED
BLACK
BLACK
9
Assembly sequence 52
Assembly sequence 53
Assembly sequence 54
Assemblethe1ststagecompressor
blades, numbers 1 and 2, the cone,
spacer and spindle washer onto the
spindle as indicated.
Please make sure that you
assemble the correct size blades
(SHORT).
Assemble the smaller 2nd stage
compressor blades with the spacer
and coned blade to the rear, as
indicated, onto the spindle.
Assemble the 1st stage turbine
bladewithconedendfacing forward
and fit the mating turbine blade No.
1, with collar, also facing forward.
Assemble the larger 2nd stage
turbine blades. The coned end of
the first turbine blade faces forward
and the mating turbine blades,
numbers 1, 2, and 3 are fitted with
their collars also facing forward.
Please make sure that you
assemble the correct size blades
(LONG).
With the turbine blades in position
fit the end cap with collar facing
forward into the recess of the rear
mating turbine blade.
jet engine
1
2
SHORT BLADES
2
1
3
LONG BLADES
24

jet engine
Assembly sequence 46
Assembly sequence 47
Assembly sequence 48
Push the air directional tubing
through the lower aerofoil half and
position the motor housing onto its
cradle
Motor housing and air directional
tubing in position
Position the top aerofoil half onto
the lower aerofoil half
22
Assembly sequence 13
Assembly sequence 14
Assembly sequence 15
Slide the shrink sleeve over folded
exposed cable ends
Apply heat using a hair dryer to
secure the shrink sleeve in position
Cut a piece of shrink sleeve to the
appropriate size and slide the
shrink sleeve over exposed cable
ends
A
A
BC
RED
BLACK
RED
11

Assembly sequence 19
Assembly sequence 20
Assembly sequence 21
The battery cover securing nut and
blanking plug are positioned into
the aperture as indicated in
assembly sequences 20 and 21
Place the nut into the aperture and
allow it to drop inside
Push the plug fully into the top of
the aperture to lock the securing
nut permanently inside aperture
13
Assembly sequence 40
Assembly sequence 41
Assembly sequence 42
Push the collar of the air directional
tubing onto the fan motor housing
unit.
Note: The collar is recessed to fit
onto the motor housing. Ensure the
collar is pushed securely in position
over the two halves of the fan outer
casing to hold them together
Connect the motor electric cables
to the engine light unit supply
cables by twisting them together as
indicated, red to red and black to
black
Cut two pieces of shrink sleeve to
length and thread over the joined
cables as indicated
jet engine
RED
BLACK
BLACK
RED
20

Assembly sequence 34
Assembly sequence 35
Assembly sequence 36
Secure the pylon to the lower
aerofoil half using two screws with
integral washers
Thread the motor electric cables
through the hole in the lower
aerofoilhalf and position the upright
support pins into the location holes
of the lower aerofoil half and engine
nacelle unit
Secure the lower aerofoil to the
upright support unit using two
screws
jet engine
18
Assembly sequence 25
Assembly sequence 26
Assembly sequence 27
Locate the top cover and support
unit onto the base unit and place
the control levers through the
holes in the top cover
Secure the base unit to the top
cover using six screws
Push the control lever handle onto
the control lever arms
15

Assembly sequence 28
Assembly sequence 29
Assembly sequence 30
Thread the motor electric cables
through the hole in the top of the
upright support unit
Position and secure the upright
support rear cover onto the upright
support using six screws
Locate the outer pylon cover onto
the inner engine nacelle and pylon
half
Note: Ensure the electric cables
from the nacelle light unit are
threaded through the pylon as
indicated before assembling the
units
jet engine
16
Assembly sequence 31
Assembly sequence 32
Assembly sequence 33
Secure pylon halves using two
screws
Thread the electric cables through
the lower aerofoil as indicated
Locate the pylon and inner engine
nacelle unit into the lower aerofoil
half
17

Assembly sequence 37
Assembly sequence 38
Assembly sequence 39
Assemble the fan blower air
directional tubing as indicated
Ensure the vertical down tube with
locating notch (clear solid plastic)
engages with the cut-out in the
right angle elbow piece (clear solid
plastic). This will ensure that the air
passes through the tubing in the
right direction to turn the engine
turbofan blades when the fan
motor is switched on
Locate the fan blade onto the motor
spindle ensuring that it is fully
pushed onto the spindle to prevent
rubbing on the outer casing
Push the outer casing over the
fan blade
This is a very tight fit - ask an adult
to help.
19
Assembly sequence 22
Assembly sequence 23
Assembly sequence 24
Push the location pins to the upright
support, into the top cover location
holes
Note: Ensure the pins to the upright
support are the correct way around
to ensure the electric cables from
the power controller can be fed
through the access holes when
assembling the base unit
Secure the upright support to the
top cover using two screws as
indicated
Offer the assembled base unit to
the top cover and thread the electric
motor connections from the power
control unit into the upright support
unit
jet engine
14

Assembly sequence 16
Assembly sequence 17
Assembly sequence 18
Push the exposed cable end
through the hole in the battery
terminal post
Secure the cable end onto the
battery terminal post
Slide the shrink sleeve over the
batteryterminalpostandconnected
cable, and apply heat using a hair
dryer to shrink the sleeve in
position
jet engine
BC
BC
BC
RED
12
Assembly sequence 43
Assembly sequence 44
Assembly sequence 45
Connect the exposed cable ends to
the wires from the motor housing by
twisting them together as indicated
Red to Red and Black to Black
Double check the polarity of wires
are correct, Red in + ve and
Black in – ve,
Slide the shrink sleeve over the
wire joints
Apply heat using a hair dryer,
shrinking the sleeve an to the
joint wires
_
+
_
+
_
+
RED
BLACK
RED
BLACK
RED
BLACK
21

Assembly sequence 49
Assembly sequence 50
Assembly sequence 51
Secure the aerofoil halves together
using four screws
Assemble the large front fan
engine blades
Push the engine spindle into
assembled large fan blades
23
Assembly sequence 10
Assembly sequence 11
Assembly sequence 12
Twist the exposed cable ends
together
Cut a length of shrink sleeve and
slide over the cables
Fold the exposed cable ends to
secure them together and to enable
the shrink sleeve to pass over the
top of the exposed part of the
cables
jet engine
A
A
A
BLACK
RED
10

Assembly sequence 4
Assembly sequence 5
Assembly sequence 6
Insert the battery terminals inside
the battery aperture as indicated
Ensure the terminals wi th
connection posts are pushed firmly
into their location slots with their
posts protruding through the box
cover
Ensure that the ‘D’ shaped shaft of
the voltage regulator is fully rotated
in a anticlockwise direction before
inserting into the mating aperture of
the control lever.
See assembly sequence 6
Push together and assemble the
lever arms, ensuring that they are
both aligned as shown, and push
the ‘D’ shaped shaft of the voltage
regulator into the mating aperture
of the right-hand lever arm
jet engine
8
Assembly sequence 55
Assembly sequence 56
Assembly sequence 57
Push the tailcone halves together
Assemble the spacer, washer and
tailcone onto the spindle
Assembled engine fan/turbine/
compressor blade unit
25

Assembly sequence 61
Assembly sequence 62
Assembly sequence 63
Assemble the turbine blade and
engine casing into the inner engine
nacelle locating the casing lug into
the nacelle notch.
Note: Secure the electric cabling
with adhesive tape into the engine
nacelle as indicated
Assemble the clear outer engine
nacelle half onto the lugs of the
inner engine nacelle half. Click and
secure into position
Insert the instrument panel sticker
into the recess to the top of the
base cover
27
Kit Parts - Turbine blade spindle, shrink sleeve
and clear tube
Kit Parts - Various
Kit Parts - Engine casings, air ducting elbow
and down tube
jet engine
6

Kit Parts - Lower and Upper Aerofoils
Kit Parts - Base and Cover
Kit Parts - Outer and Inner Engine Nacelles
Kit Parts - Rear Cover and Upright Support
jet engine
4
Assembled kit
To operate the Jet Engine, press
the button to start the motor and
then rotate the lever handle to
increase or decrease the power to
the engine turbine blade assembly
Assembly sequence 67
Using a cross head screw
driver,tighten the bolt to secure the
cover plate to the base
29

jet engine
The Jet Engine
The jet engine was developed
simultaneously by Great Britain and Germany
in the 1930s. A young flying officer in the
British Royal Air Force, Frank Whittle, and a
German physics student, Hans von Ohain
both developed the idea at the same time for
a turbojet power plant which over the years
has become the jet engine as we know it
today.The original turbojet jet engine was a
breakthrough in engineering which enabled
aircraft to fly up to speeds of 500mph, today
the jet engine has been developed so that
they can fly at up to three times the speed of
sound which is nearly 2000mph!
The jet engine is in the shape of a barrel with
both ends open. Huge quantities of air are
sucked into the front end and then
compressed with the use of fan blades. The
compressed air is fed into the combustion
chamber at the centre of the engine.
A constant spray of fuel is fed into the
chamber which then mixes with the air
inside. When the air and fuel mixture burns
it becomes extremely hot which causes the
mixture to expand massively. This
expansion makes the hot gases rush out of
the exhaust nozzle at the back of the
barrel-shaped jet engine. As the air rushes
out of the jet engine a big fan known as a
turbine spins around and sucks more air into
the front of the engine through the forward
compressor. As the gases rush out of the jet
engine this causes the engine to move for-
ward, this is based on the famous scientist
Sir Isaac Newton’s Third Law of Motion.
Newton discovered that for every action
there must be an equal and opposite reac-
tion, so the big push of gases out of the back
of the jet engine (or backward thrust) results
in an equally strong push forward (forward
thrust). The faster the jet engine spins, the
more air is sucked in which, in turn creates
more power. When you have built your Jet
Engine switch it on and move the handle
backwards and forwards to adjust the speed
and see how the engine works. Today jet
engines based on the original design are
used for most Military aircraft, however, the
design has been adapted for use on large
passenger aircraft to make the engine both
quieter and cheaper to run. By increasing
the size of the front fan blades part of the air
is fed directly to the turbine at the back while
the rest of the air is directed through the
centre of the engine. The colder air fed to
the back mixes with the hot gases from the
turbine which expands to give greater thrust
from the same amount of fuel. Since its
invention the jet engine has made the world
a smaller place allowing people to travel
large distances at speeds they would have
never dreamt of before.
2
Notes