Accession Number : ADA167719


Title :   A Trade-off Study of Tilt Rotor Aircraft versus Helicopters Using VASCOMP 2 and HESCOMP


Descriptive Note : Master's thesis


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA


Personal Author(s) : Walsh, Thomas P


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a167719.pdf


Report Date : Mar 1986


Pagination or Media Count : 218


Abstract : Trade-off studies were conducted wherein two versions of tilt rotor aircraft were examined to determine optimum mission distances where the tilt rotor designs were superior to a comparable contemporary (pure) helicopter. Two FORTRAN computer programs (VASCOMP II and HESCOMP) were used to predict aircraft performance. Program results were validated using data from independent sources. A simplified user's manual is included (with sample data and program output) for VASCOMP II. The experimental results substantiate that the V-22, designated to replace the CH-46F among other aircraft, will offer significant improvements in speed, loiter endurance, hover endurance, performance, and efficiency. The results lend further credence to the manufacturer's claims that tilt rotor aircraft can transport more passengers/payload over longer distances in less time than conventional helicopters while retaining the important advantage of vertical takeoff and landing. It is acknowledged that the tilt rotor can readily perform transport missions using less fuel than helicopters but if a large percentage of hovering flight is required, conventional rotary wing aircraft are far more efficient than a fuel consumption standpoint. However, they do not have the staying power that the tilt rotor demonstrates.


Descriptors :   *HELICOPTERS , *TILT ROTOR AIRCRAFT , COMPUTER PROGRAMS , USER MANUALS , OUTPUT , SOURCES , PAYLOAD , OPTIMIZATION , AIRCRAFT , VERTICAL ORIENTATION , ROTARY WING AIRCRAFT , PASSENGERS , SIMPLIFICATION , ROTORS , TRADE OFF ANALYSIS , FUEL CONSUMPTION , TAKEOFF , TRANSPORT , MISSIONS , SHORT TAKEOFF AIRCRAFT , VERTICAL TAKEOFF AIRCRAFT , HOVERING , TILT , FLIGHT , PERFORMANCE(ENGINEERING) , THESES , ROTOR BLADES(ROTARY WINGS) , FORTRAN , FUELS , ENDURANCE(GENERAL)


Subject Categories : Helicopters
      V/STOL
      Computer Programming and Software


Distribution Statement : APPROVED FOR PUBLIC RELEASE