helicopter cutaway drawing
Rotor head
Gearbox transmitting drive from gearbox to rotor
Starboard of twin turbojets driving rotor
Air intake for gearbox cooling
Grill over oil cooler
Air intakes (one on each side)
Control console
Pilot tube and flight instruments
Radar; one on each side of fuselage
gives extra wide angle coverage
Rocket projectile launcher with magazine under pressure bulkhead
Pressure bulkhead
Cabin air system
Exhaust outlet for cooling airwith bleed-off pump serving floats
Floats can be inflated to any pressure required according
to the nature of the landing terrain. Air is contained in
an inner tube protected by an outer of tough Maylon which
is bonded to the metal shoe on top of the float
Booster jet for attaining maximum speed in forward flight
Emergency rocket booster
Rocket fuel tank
Actuator for variable incident tail vanes;
the design of the tail is such that the old
style side propellor can be dispensed with
Fuel tanks
Electronics bay
power plant
Air intakes (1) supply air to twin motors, one each side (7). Intake (2) supplies air to gearbox (6). The hot air then passes to exhaust port via various bleed-off systems (8) through the structural member (3). Gearbox transmits drive from gearbox to rotor head (4). the grill behind (5) masks the oil-cooling system.
power plant
air intake
air intake
structural member
rotor head
bleed-off system
Passengers carried to rear of pilot. Pilot position shown. Main feature is the navigation screen which shows the helicopter's position in relation to other known factors such as Spectrum agents.
puppet scale cabin
The puppet scale interior
Bled air from gearbox cooling intake feeds compressor which inflates airbags inside float to correct pressure for landing on sea, smooth or rough ground. The float has an outer skin of tough maylon bonded to the metal shoe on the top of the float.
Unusual wing-shaped ring tail gives great stability and in conjunction with the other airflow surfaces
of the craft enables the plane to glide for a considerable way in the unlikely event of power failure.
Unusual wing-shaped ring tail gives great stability and in conjunction with the other airflow surfaces of the craft enables the plane to glide for a considerable way in the unlikely event of power failure.
Can be varied – provision for attachment of most kinds of guns but normally carries one only. This is situated immediately in front of the cockpit and fires high explosive rocket projectiles.
Immensely strong box and tube construction. The interior of these structural members is put to several uses. The arrows show the passage of air from the vicinity of the motors to an exhaust port at the bottom. This air column is tapped for cabin heating, de-icing and float inflation.

Technical specifications published originally in Captain Scarlet 1968 Annual,
later reprinted in Dutch Captain Scarlet Album


  1. Designed basically for high speed transportation of Spectrum personnel over short distances.
  2. Can land in any area of terrain.
  3. Powered by Harrison fuel, the twin rotor blades are driven by twin air induction turbo jets.
  4. Radar scanners and radar computer navigational control equipment are housed in the cockpit. The cockpit also houses an automatic pilot and the omin scanner — a device for showing the type of terrain over which the craft is flying.


Helicopter illustration Helicopter illustration Helicopter illustration

Emergency Control

Spectrum research has devised a special emergency control attachment for the Spectrum helicopter to prevent crashing once the rotor blades become ineffective. As soon as the rotors "cut out", the emergency propulsion unit is brought into play allowing the craft to land safely.

Deflector plates fitted into the four (2x twin) jet motors are activated when main propulsion rotor drive ceases. Hot air is then forced through the deflector blades to the reserve jet-thrust situated in the underside of the fuselage. Energy built up within the main engines is then diffused down inflatron-magna-pipes to create a thrust unit within the reserve engine. Befere conversion into boost to fire reserve power, this energy is passed through a reheat-ring to give extra boost power to already spent power. The reserve engines are served by the main rocket fuel tanks in the nose and once main engines fail, computer pre-selection diverts this fuel into reserve.

Once in operation, stubwings expand from the helicopter's main body as the engines provide enough energy and hover power to allow the pilot to land the 'copter safely.

additional specifications published originally in Captain Scarlet 1969 annual

side elevation
Side elevation
front elevation
Front elevation
back elevation
Back elevation
reverse plan
Reverse plan

Elevations published originally in Captain Scarlet model sheet

Technical Specifications
name: Spectrum Helicopter
top speed: 400 m.p.h.
length: 45 feet
weight: 36,000 ibs
armaments: high speed high explosive rocket projected cannons; electron ray discharge cannon
power plant: air feed turbos, mark 2 Windenown, 7 turbos.
blades: 20 feet
description: Fast, light, and with all the manoeuverability and versatility available through man's enormous technological advances, the Spectrum Helicopter forms a vital part in the organisation's transport line-up. Ideal for quick shifting of personnel from one scene of action to another, for fast, intricate, local manoeuvres and for landing or delivering men or supplies where no other craft can reach, the helicopter is without equal.
General purpose vehicle, used primarily for transporting Spectrum personnel from place to place. Its rugged construction makes it especially suitable for landing on rough terrain, shifting sand and heavy seas. 45 ft. in length with 39 ft. diameter 'copter blades rotating at 2,000 rpm, it can carry up to five men flying at a maximum speed of 302 mph. Although specifically a non-combat vehicle, Spectrum helicopters pack a veritable artillery – ready for any situation.
designer: Derek Meddings