A MAIN POWER SYSTEM FOR SHAFT-DRIVEN HEAVY LIFT HELICOPTERS
Abstract
Multiple gas generators, installed in a conventional horizontal position, are all gas-coupled to the same peripherally-driven remote turbine of the lift and cruise fan type. The remote turbine is mounted co-axially to a speed-reducing gearbox which is also coaxial with the rotor. The concept is known as the Turbine Integrated Geared Rotor 'TIGR'. The TIGR arrangement eliminates from transmission design the functions of engine combining, change of direction, part of the required speed reduction from conventional engine speed to rotor speed, misalignment couplings and all of the multiple individualengine overrunning-clutch provisions required for engineout operation and for autorotation. A three-phase program of design, analysis, and comparative evaluation of TIGR, including the effect on adjacent systems and the resulting Heavy Lift Helicopter (HLH) aircraft, is presented. The results show TIGR has a 280 percent improvement in mean time between mission-abort failure over conventional multiple engine/transmission practice for the entire HLH power train from the engine inlets to the rotor hub. Cost per HLH flight hour is reduced, and the high fuel efficiency of mechanically-driven rotors is retained. TIGR is believed to be eminently practical and is ready for dynamic testing.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1965
- Accession Number
- AD0624145
Entities
People
- Robert B. Bossler Jr.
Organizations
- Kaman Corporation