Aircraft overview
The BO105 is a twin-turbine light helicopter distinguished by its four-bladed, hingeless main rotor. A titanium rotor head and glass-fibre-reinforced blades form the central feature of the design, while skid landing gear and a compact cabin support passenger, rescue and utility work.
The first BO105 flew on 16 February 1967, with deliveries beginning in 1970. The CBS-4 uses two 250-C20B engines and has a 2,500 kg maximum mass.
Photo: Mark Harkin · 24 June 2013 · Photo source: Scotland's Charity Air Ambulance G-CDBS (9129022497) · CC BY 2.0 · Uncropped original.
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At a glance
BO105 S · CBS-4 configuration with 250-C20B engines
- Engines
- Two Rolls-Royce/Allison 250-C20B turboshaftsCBS/CBS-4 installation.
- Main rotor
- Four blades ·9.84 m diameterHingeless hub and glass-fibre-reinforced blades.
- Tail rotor
- Two blades ·1.90 m diameterGlass-fibre-reinforced blades.
- Body width
- 1.58 mFuselage dimension.
- Maximum mass
- 2,500 kgCBS-4; earlier configurations differ.
- Cabin
- One pilot + up to four passengersFive passengers with the approved optional four-seat bench.
- Fuel ·total /usable
- 580 /570 litresPublished S-series installation.
In Air Defender
Role guidance · v0.8.16.0
Air Defender v0.8.16.0 has no dedicated BO105 entry in its general aircraft-reference catalogue.
Compare the AS355 and the Bell 407. Aircraft Data explains the game’s aircraft-information display.
Game catalogue values · v0.8.16.0
Read the selected flight
The game names the aircraft family, without a variant suffix. Read Flight Info for this contact’s reported type, height and speed. The real-aircraft specifications describe the named variant; they are not the current state of your selected flight.
In depth
Origins and roles
The BO105 first flew in February 1967, and deliveries began in 1970. It was developed as a light multi-purpose helicopter and went on to work in rescue, police, military, passenger and cargo roles.
Its hingeless rotor became a defining feature of the design. Different military and civil equipment fits developed around the basic airframe; those mission installations are separate from the CBS-4 specification.
The hingeless main rotor
The four main blades are attached to a rigid titanium rotor head without conventional flapping and lead-lag hinges. The blades use glass-fibre-reinforced construction, whose flexibility accommodates the required movement.
The CBS-4 main rotor is 9.84 m in diameter. The CBS-5 has a different 9.80 m figure, so even a small change in the model designation matters to the dimensional reference.
Structure and engine installation
The semi-monocoque airframe uses honeycomb components in parts of its structure. It has skid landing gear, a conventional two-bladed tail rotor and a horizontal stabiliser with end plates.
Two 250-C20B turboshafts power the CBS-4. The engine and transmission limits distinguish normal two-engine conditions from one-engine-inoperative ratings.
Cabin and loading
The minimum crew is one pilot in the right seat. The normal maximum is four passengers; an approved optional four-seat rear bench increases that to five passengers.
The CBS-4 maximum mass is 2,500 kg. Earlier CS and CBS configurations have different limits or require a specific modification for the increased weight.
Fuel and equipment options
The published tank capacity is 580 litres, with 570 usable. Mission equipment and cabin arrangements affect empty weight and the remaining capacity for occupants and fuel.
Instrument-flight and particular take-off/landing capabilities depend on the approved equipment and flight-manual supplements. They are configuration approvals, rather than capabilities to assign to every BO105 from the type name alone.
Variants
BO105 CS /CBS
Earlier configurations with their own engine, loading and modification conditions.
BO105 CBS-4
250-C20B-powered, 2,500 kg configuration.
BO105 CBS-5
Related configuration with a 9.80 m main-rotor diameter.
After 1998
2017 · successor context
By 2017, the H135 had succeeded the BO105 in the manufacturer’s light-helicopter range. Its newer cockpit and Fenestron tail rotor belong to the H135, not a BO105 in the game’s 1998 setting.