Limited Artificial and Natural Icing Test of the OV-1D (Re-Evaluation).

The USAAEFA conducted an icing evaluation of the engine inlets of an OV-1D aircraft. The test included artificial icing flights in St. Paul, Minnesota and natural icing flights in Salem, Oregon. A total of 13 test flights, 8 artificial tests and 5 natural tests, totalling 22.8 hours were performed....

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Bibliographic Details
Main Authors: Carpenter,Ronald B, Ward,Robert N, Robbins,Robert D
Other Authors: ARMY AVIATION ENGINEERING FLIGHT ACTIVITY EDWARDS AFB CA
Format: Text
Language:English
Published: 1982
Subjects:
Aircraft
Snow
Ice and Permafrost
*AIRCRAFT
*DEICING SYSTEMS
*ICE PREVENTION
SIMULATION
FIELD TESTS
TEST METHODS
ICE FORMATION
WINDSHIELDS
KITS
RETROFITTING
COLD WEATHER TESTS
PROPELLER BLADES
OV-1D aircraft
Engine inlets
Ice
permafrost
Online Access:http://www.dtic.mil/docs/citations/ADA127191
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA127191
Description
Summary:The USAAEFA conducted an icing evaluation of the engine inlets of an OV-1D aircraft. The test included artificial icing flights in St. Paul, Minnesota and natural icing flights in Salem, Oregon. A total of 13 test flights, 8 artificial tests and 5 natural tests, totalling 22.8 hours were performed. Total cloud immersion time was 4.2 hours for artificial icing and 6.5 for natural icing. A range of temperatures, liquid water contents and droplet sizes were experienced. The engine inlet ice protection system was modified three times. The modifications included increased electrical power available, increased duty times of heating elements, and addition of insulation in the cowling. The No. 2 engine final configuration cowling produced the most favorable ice accretion characteristics. However, in all cases, ice formed on the propeller blades, propeller spinners and propeller spinner afterbody. In artificial icing tests, ice was found inside the engine inlet. Aircraft performance was significantly degraded apparently due to ice accretion on the propeller blades. Two deficiencies were identified: the inability of the windshield anti-ice system to clear the windshield of ice; and, significant qunatiites of ice forming on the propeller spinner afterbody.

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