Helicopter Hover Performance Estimation Comparison with UH-IH Iroquois Flight Data.

reportActive / Technical Report | Accession Number: ADA173707 | Open PDF

Abstract:

The hover performance of the UH-1H Iroquois has been estimated under a variety of operational conditions using POLAR2, a program based on blade element theory. This program is an improved version of POLAR, a program previously developed at ARL, which did not allow for compressibility effects. The occurrence of these effects in a hovering situation is discussed, and a relationship allowing for such effects has been derived and included in POLAR2. Other improvements, designed to make the program more convenient ot use include the calculation of tail rotor performance together with variables such as tip loss, air density and Lock number which were previously input. The role of the induced velocity factor is also discussed. Finally, comparisons of estimates using POLAR2 and ARDU flight trials data for the UH-1H are presented.

Author(s):
Williams, M. J. ; Arney, A. M.
Author Organization(s):
AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)
Descriptive Note:
Technical memo.,
Pagination:
0038

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
ARL-AERO-TM-377
 Subject Terms
Joint Capability Areas:
JCA_7.2.1_Mitigate Lethal Effects; JCA_7.2_Mitigate; JCA_7_Protection; JCA_6_Net Centric; JCA_1_Force Support; JCA_6.4.1_Secure Information Exchange; JCA_4.6_Engineering; JCA_6.1_Information Transport; JCA_1.2_Force Preparation; JCA_4.3_Maintain; JCA_6.4_Information Assurance; JCA_1.2.3_Educating
Communities of Interest:
Air Platforms
Descriptor(s):
*HELICOPTERS, *HOVERING, COMPUTER PROGRAMS, PERFORMANCE(ENGINEERING), ROTOR BLADES(ROTARY WINGS), MATHEMATICAL PREDICTION, AERODYNAMIC CHARACTERISTICS, POWER, AUSTRALIA, ALTITUDE, THRUST, TORQUE, GROUND EFFECT, TAIL HELICOPTER ROTORS
Field(s)/Group(s):
Fluid Mechanics
Keyword(s):
POLAR2 Computer Program, H 1 Aircraft, UH 1H Aircraft, Blade ELement Theory
Report Date:
1986 Apr 01