English Česky Deutsch Francais

- About Project
- History
- NA 542
- NA 542 CTS
- NA 40 Bongo
- Gallery
- Video

- Patents
- CoCoMo vs. NOTAR
Compound twin turboshaft helicopter
NA 542 CTS
NA 542 CTS
Technical specification:  
Never-Exceed Speed 350 km/h
Max.Cruising Speed 290 km/h
Economical Speed 260 km/h
Climb Rate 9.5 m/s
Range 1050 km
Endurance 4.5 hrs.
Service ceiling 5800 m
Max. operating altitude 6200 m
Hovering in ground effect 3100 m
Hovering out of ground effect 2100 m
Empty (without options) 745 kg
Max. take-off weight - normal cat. 1540 kg
Max. take-off - external load oper. 1635 kg
Maximum internal weight 685 kg
Max. external weight 720 kg
Usable internal fuel capacity 405 kg
Disk span 8.20 m
Length 6.88 m
Height 2.42 m
Power unit  
Type 2x TS-100
Take-off power 2x 220 kW
Fuel Jet A, A1, JP5, JP8


Technical description

NA-542 CTS is a light five-seated twin-engine compound helicopter. Its tail rotor has been substituted by a proprietary patented system for complete compensation of momentum (COCOMO) and is equipped with Tail Fan System for better efficiency during horizontal flight.

Fuselage is manufactured from carbon fibres, nomex & aluminium honeycombs and other composite materials. The cockpit, power units and fuel tank are based on a primary composite double curvature monocoque sandwich structure, which is manufactured using high-temperature vacuume production technology just like for other primary and secondary composite parts.

Cockpit configuration is equipped with analogue avionics for VFR flights and has dual flight control systems. IFR and "glass cockpit" versions will be developed at a later stage.

Standard HEMS stretcher fits into interior for HEMS missions.

The power unit consists of two turboshaft engines TS-100 - output 2x220 kW. A digital/analogue FADEC computer continuously monitors and controls the unit.

Four fully-composite rotorblades are fitted in three axes with elastomeric suspensions and have a "safe when damaged"-design.

Helicopter's elastomeric rotorhead is designed for maintenance-free service and its conception is similar to the Starflex system.

Helicopter's tail section is equally fully-composite including the stabilisation, compensation elements and Tail Fan System.

The helicopter is equipped with a fixed-skids landing gear.

Normal VFR, IFR
Operational JAR Ops 3, Category A, Performance Class 1, 2

Helicopter JAR 27
Noise JAR 36
Power unit JAR 33
Emission JAR 34

Safety is improved by elimination of tail rotor hazards.

Helicopter is friendly to the Environment due to very quiet operations (flyover at 500 feet AGL = 72,5 dbA).


První brněnská strojírna Velká Bítes, a.s.
GRM Systems
PeckaDesign, s.r.o.