Craft, Vehicles and Equipment: Spectrum Helijet

LATEST UPDATES: APRIL 20, 2025: FAN FICTION: "Easter Bunny Trouble", by Cwissy /// MARCH 17, 2025: FAN FICTION: "St Patrick's Day Dream", by Cwissy /// MARCH 9, 2025: FAN FICTION: "Only Acceptable Course of Action", by Shades /// FEBRUARY 14, 2025: FAN FICTION: "Many Ways to Say it And Some of Them Involves Words", by Shades - VALENTINE DAY FAN FICTION: "Five Very Important Words", by Shades - "The Valentine Tiger", by Cwissy /// JANUARY 30, 2025: CHRISTMAS CHALLENGE ENDS! Reposting of 10 stories from the first decade of Spectrum HQ: "The Gift of Oneself", "Darkness of the Mind" and "Christmas Lights", by Marion Woods - "I'll be Home for Christmas", by Tiger Jackson - "The Spirit of Christmas", by Alan J. Porter - "The Society for the Prevention of Bah'Humbug", by Sage Harper - "Twisted Trinity" and "The Vigil", by Skybase Girl", "Underground Heroics", by Kimberly Murphy - "Have You Got a Light?" by Marizel /// DECEMBER 31, 2024: CHRISTMAS CHALLENGE: "Spectrum Reconstructed!" Unofficial 2025 Captain Scarlet Calendar, by Clya Brown, with the collaboration of Chris Bishop, Caroline Smith and Hazel Köhler /// DECEMBER 25, 2024: CHRISTMAS FAN FICTION CHALLENGE: First stories posted: "Duty of Care", by Shades - "The True Spirit of Christmas", by Marion Woods - "A Christmas Modelling Bee", by Cwissy /// DECEMBER 1rst, 2024: CHRISTMAS FAN FICTION CHALLENGE now launched! See the page for information on how to participate! /// NOVEMBER 13, 2024: HALLOWEEN FAN FICTION CHALLENGE: "Kokkino", by Sharn - New arts posted on the HALLOWEEN IMAGES page /// NOVEMBER 3rd, 2024: HALLOWEEN FAN FICTION CHALLENGE: "Secrets", by Shades ///

SPECTRUM CRAFT

Spectrum logo

Angels Flight

Image courtesy of Keith McNeill's Space Model Photography website, with permission.

The Spectrum Helijet (or Spectrum Helicopter) is designed primarily for high-speed transportation of personnel over short distances, particularly where rough and difficult terrain is involved, and for reconnaissance duties.

Based on the World Army Air-force "Rotar" (Round Tail Rotor) helijets (2066), the Spectrum Helijet is usually armed with a single machine-gun, and are powered by seven air-feed mark II Windenown turbo-engines. The triple rotor-blades (for lift, travelling at 2,000 RPM), plus quad bladed ring-rotor for tail, are driving by two of these air-inducted turbo-jets.

The Helijet is 45 feet long with 19 feet 6 inches wide each rotor-blade, giving a rotor-diameters of 39 feet), a weight of 36,000 Lbs (16.07 Tons). It has a flight ceiling of 40,000 feet (height of Cloudbase) and a top speed of 302 MPH.

The Spectrum Helijet is five seater vehicles, constructed at Universal Engineering Incorporated, Sydney, Australia. The Helijet is powered by fuel distilled from the Spectrum refinery at Bensheba, are made from Fleetonium allow and are Blue and White in colour. The landing legs are fitted with black floatation pods/pontoons for landing on water.

Cutaways

Flight instruments measuring wind speed, air pressure and temperature.
Wide angle duel-dish radar system.
Variable gun attachment, normally carrying a high explosive rocket projectile launcher.
Control console, featuring LCD navigation screen and auto pilot situated directly beneath.
Central pilot' seat.
Passenger seats with service access to electronics bay and storage compartments.
Port air intake.
Air intake for gearbox cooling system.
Cabin air and pressurisation system.
Port turbojet driving rotor.
Gearbox transmitting drive from turbojets to rotor.
Rotor drive shaft housing.

Rotor head.
Port exhaust bleed off system.
Oil cooler.
Electronics bay.
Fuel tanks.
Exhaust outlet for cooling air with bleed off pump serving floats.
Booster jet for attaining maximum speed in forward flight.
Emergency rocket booster.
Rocket fuel tank.
Actuator for variable incident tail vanes.
ump regulator controlling air flow to floats.
Port float - these can be inflated to any pressure required according to the landing terrain. Air is contained in an inner tube protected by a Maylon armoured outer skin bonded to the metal shoe on top of the float.

Elevations

Graciously provided by Arthur Twosheds' DeviantArt Gallery.

Powerplant

Air intakes (1) supply air to twin motors, one each side (7). Intake (2) supplies cooling 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 turbos to rotor head (4).

The grill behind (5) masks the oil-cooling system.

For normal landing or reducing air speed quickly, bled air is used as braking jets (4), whilst in case of emergency a small but powerful retro rocket (5) can be brought into play. The lower double slit supplies booster reheat warm air.

Fuselage

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.

Helicopter Fuselage

Tail

Unusual ring-shaped wing tail gives great stability and in conjunction with the other air-flow surfaces of the craft enables the plane to glide for a considerable way in the unlikely event of power failure.

Helicopter tail

Floats

Bled air from gearbox cooling intake feeds compressor which inflates air bags 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.

Helicopter Floats

Cabin

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.

Helicopter cabin

Weapon

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.

(Sources: TV Century 21 material (Annuals, books and magazines), Engale Marketing's Century 21 magazine, Issue 15, Winter 1995, Fleetway Magazines, Captain Scarlet & the Mysterons book by Chris Drake & Graham Bassett, Complete Book of Captain Scarlet by Chris Bentley… all related to TV Century 21 material - Photo-montages provided by Keith McNeill's 's Space Model Photography.)

CLOUDBASE - ANGEL AIRCRAFT - SPECTRUM PASSENGER JET (SPJ) - SPECTRUM HELIJET - MAGNACOPTER

SPECTRUM PURSUIT VEHICLE (SPV) - MAXIMUM SECURITY VEHICLE (MSV) - SPECTRUM SALOON CAR (SSC) - YELLOW FOX

SPECTRUM DETECTOR VAN - SPECTRUM HOVERCRAFT - SPECTRUM CLAM SUB

COLOR-CODED OFFICER UNIFORM - ANGEL PILOT UNIFORM - OTHER UNIFORMS

WEAPONS - COMMUNICATIONS DEVICES - OTHER EQUIPMENT - NEW CAPTAIN SCARLET EQUIPMENT

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