Accession Number:

AD0620587

Title:

TIME DELAY RELAYS FOR AIRCRAFT APPLICATIONS,

Descriptive Note:

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s):

Report Date:

1948-06-09

Pagination or Media Count:

17.0

Abstract:

An investigation was conducted to determine methods of obtaining time delay in aircraft relays in which the delay is not to be adversely affected by current, voltage, atmospheric pressure, vibrations, or ambient temperature changes. Various means of obtaining time delays were investigated, both theoretically and experimentally. Two types of relays found to have good possibilities were a thermal and an electromechanical type. The thermal type containing two electrically heated bimetal strips gives a fair degree of accuracy but requires at least 45 seconds recycling time. The electromechanical type contains a timing motor whose speed is controlled by a vibrating reed. It has good accuracy and can be recycled almost instantly. Further development of both types is recommended. A constant current device should be incorporated into the thermal type so as to make it reasonable independent of applied voltage. Size, weight and susceptibility to vibration should be improved upon in the electromechanical type. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE