BO 105

The BO 105 is a five-place, multi-purpose utility helicopter having a hingeless, four-bladed main rotor and a semi-rigid two-bladed tail rotor. The main and tail rotor blades are constructed of fiber-reinforced composite materials.The helicopter is powered by two Allison 250-C20 series engines of the free wheel turbine type. The engine power is transmitted by the main rotor transmission via independent drive systems.The main transmission consists of three major subassemblies, in which two bevel gear input stages with freewheel clutches, a spur collector gear stage and a planetary reduction stage are housed.The total fuel quantity is stored in three flexible bladder-type tanks, two main tanks (forward and aft) and one supply tank, all installed in the tank compartment beneath the cabin floor.

The BO 105 is used by the DLR as a research platform with a wide range of applications like

analysis of flight characteristics
use as camera platform for infrared videos
measurement of noise during special flight procedures
development of pilot assistance systems
flying with external loads

For the research tasks we have very special equipment like

data recording system
nose boom
instrumentated main and tail rotor (strain gauges and pressure sensors)
external cargo hook system
hardpoints at the fuselage for external loads
IFR-cockpit
LASSIE-system

Technical Data

Overall length 11.86 m

Rotor diameter 9.84 m

Number of seats 1+4

Max. takeoff weight 2400 kg

Engines 2 x Allison 250-C 20B (2 x 313 KW)

Max. operating altitude 17000 ft

Max. range (sea level) 330 NM

Max. endurance 2:30 h

Max. payload 640 kg

Max. fuel 456 kg

Cruising speed 110 knots

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