Evaluation of the OH-58A Helicopter with an Allison 250-C20 Engine
Abstract
The United States Army Aviation Systems Test Activity conducted a limited performance and handling qualities evaluation of the Bell Helicopter Company model OH-58A helicopter with an Allison 250-C20 engine installed. Twenty-five flights, 21.2 productive test hours, were required for the evaluation. Test results obtained with the Allison 250-C20 engine were compared with those previously obtained with the standard T63-A-700 engine. The primary performance improvement noted was an increase in out-of-ground-effect hover ceiling at a 3000-lb gross weight to 10,000 ft from 4600 ft. The long-range cruise airspeed was increased to 111 knots true airspeed from 104 knots true airspeed at a 5000-ft density altitude and a 3000-lb gross weight. The increased engine power did not significantly increase the service ceiling over the basic OH-58A at identical gross weights. One shortcoming, insufficient left directional control at 35 knots true airspeed in right sideward flight, was noted. Within the scope of the test, the performance of the OH-58A helicopter with the Allison 250-C20 engine was improved over the basic OH-58A helicopter. Handling qualities were essentially unchanged.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1972
- Accession Number
- AD0907291
Entities
People
- Alton W. Werner
- Donald G. Broadhurst
- Emmett J. Laing
- Tom P. Benson
Organizations
- Edwards Air Force Base