US Government As Represented by the Secretary of the Army

William P D'Amico

Bradford S Davis

Gary S Borgen

Thomas E Harkins

David J Hepner

Michael S L Hollis

Edward F Bukowski

Peter C Muller

Lawrence W Burke

An electronic safe and arm apparatus disposed in a projectile having a spin axis and a spin rate includes a battery; a power supply board connected to the battery, the power supply board including a mechanical G-switch that closes permanently at a predetermined acceleration, and a time-delay circuit connected to the G-switch; a firing board connected to the power supply board, the firing board including: an accelerometer that is oriented perpendicular to and disposed a fixed distance from the spin axis, an output of the accelerometer varying according to the fixed distance from the spin axis and the spin rate of the projectile; a comparator connected to the output of the accelerometer wherein the comparator compares the output of the accelerometer to a threshold voltage and an output of the comparator is low when the output of the accelerometer is less than the threshold voltage and the output of the comparator is high when the output of the accelerometer exceeds the threshold voltage; a rectifier connected to the output of the comparator; a firing capacitor, the rectifier being connected between the battery and the firing capacitor whereby when the output of the comparator is high the comparator saturates a gate of the rectifier thereby allowing the firing capacitor to charge; and an initiator connected to an output of the firing capacitor; and a timing board connected to the power supply board and the firing board, the timing board for setting and controlling a predetermined time delay for discharge of the firing capacitor into the initiator.

Electronic safe and arm apparatus for initiating a pyrotechnic

A system which is packaged within a projectile fuze body and obtains data relative to the projectile during a launch. Sensors are provided which obtain in-bore data as well as in-flight data. The in-bore data is recorded at a fast rate during in-bore travel of the projectile and is read out, continuously, at a slower rate during in-flight travel. Both in-bore data and in-flight data are encoded and transmitted to a ground station for analysis.

Aeroballistic diagnostic system

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Havre de Grace, MD, United States of America

William P D'Amico