We have a Wilson Bifold door on our Hangar/Home. It has been trouble free for almost 18 years. It uses an electric motor with a winch shaft to raise the door. The door is 12.5 high by 38 ft wide.
Roberta
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Roberta Hegy
Built/Flew an RV-7A
Air Troy Estates, East Troy, WI
Ford Expedition and TRICE "Q"
Built Glen L "ZIP" Classic Outboard Runabout and Super Spartan Hydroplane
Glen L Torpedo
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