Accession Number:

ADA180966

Title:

Evaluation of the OV-1D Aircraft with the YT53-L-704 Engine and Rudder Augmentation System. Phase 2

Descriptive Note:

Final rept. 16 Dec 1985-7 Mar 1986

Corporate Author:

ARMY AVIATION ENGINEERING FLIGHT ACTIVITY EDWARDS AFB CA

Report Date:

1986-11-01

Pagination or Media Count:

105.0

Abstract:

A 3-phase evaluation of the OV-1D aircraft with increased power YT53- L- 704 engines and a prototype rudder augmentation system RAS installation was performed. Phase I involved engine build-up, initial engine and RAS installation, enginepropellerairframe compatibility tests, and initial flight tests. The Louvered Scarfed Shroud Suppressor LSSS system was removed following a high power ground run due to high engine nacelle temperatures which caused extensive damage to the fire shield and seal. All subsequent tests were conducted without LSSS installed. In the Phase IIA tests, the directional control system as designed and modified with RAS was unsatisfactory. Phase IIB required 30.5 flight hours to complete. No problem of YT53-L-704 engine OV-1D airframe compatibility were identified with the exception of the LSSS high nacelle temperature. With YT53-L-704 engines installed, the OV-1D takeoff and single-engine climb performance were significantly improved. Dual-engine level flight range and endurance decreased approximately 5 and 4, respectively. Handling qualities of the OV-1D were essentially unchanged at the high powers attainable with the Y53-L-704. Pedal forces, although high, did not increase significantly during single-engine operation at the YT53-L-704 attainable power. The single-engine minimum control airspeed increased approximately 34 knot per 100 shaft horsepower.

Subject Categories:

  • Military Aircraft Operations
  • VSTOL
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE