Imagine using unattended ground sensors to provide continuous weather reports and surveillance of critical targets in enemy areas. The Defense Department thinks the idea is sound enough to pursue. The agency includes it among nine projects it will fund this fiscal year under its Advanced Concept Technology Demonstration (ACTD) program. The other projects are: a networked early warning system for biological threats, a method for detecting coordinated attacks on computer networks, a "joint continuous strike environment" using combined suites of weapons on targets, a system for moving weapons and other materiel from ship to shore in heavy seas, an interface between major tactical data links on the ground and in the air, an advanced forward looking infrared system for precise target location and identification, a markedly improved capability for precise counterfire at the battle-theater level, and a line-of-sight system for high-speed destruction of many tanks at once.
The choice between helical and spur gears in gearboxes may seem straightforward. But with planetary gearboxes, however, the choice between helical and spur gears requires some additional thought. Here’s what you need to know to make the right choice.
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