The U.S. Army has evaluated more than a dozen bids to replace the engine in its widely used AAI RQ-7B Shadow tactical unmanned aircraft to address reliability issues. The proposals were received in response to a request for information on potential replacements for the Shadow’s 38-hp AR741 rotary engine, made by UAV Engines Ltd., which has suffered a spate of failures when operating in Afghanistan. “We broke [the engine] away from AAI and are competing it,” says Col. Timothy Baxter, ...


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