“The actor Reginald Denny, a First World War ace and model-plane enthusiast, designed remote-piloted target drones for the United States Army in anticipation of the Second World War (he eventually sold the business to Northrop)…”
From Nick Paumgarten’s article about drones, “Here’s Looking at You,” in the 5/14/12 issue of The New Yorker.
I guess Hedy Lamarr wasn’t the only Hollywood star turned inventor (although she was certainly the prettiest).