Enstrom Helicopter unveiled plans last week to develop a new helicopter, as well as a major plant expansion and upgrade of its Menominee, Mich. headquarters. Construction is set to begin next month on an $8 million, 70,000-sq-ft expansion. Enstrom was purchased late last year by Chongqing (China) Helicopter Investment. Over the last 18 months Enstrom has more than doubled its employment to 165 and plans to deliver 32 helicopters this year and 45 next year.