Dave and Tim have worked together for over 30 years at large corporations, smaller organizations, and eventually as partners in their own businesses. Dave and Tim’s combined 70 years of experience means that if it is mechanically complex, uses fuel, or traverses land or water then it’s in their wheelhouse.


Tim Bartley and Dave Gruenwald, third and fourth from left, pose beside the L-Drive
(circa 1989)

Together, Dave and Tim hold more than 25 U.S. patents and have utilized their innovation and creativity in a number of diverse, award-winning products including a 500 horsepower “Zeus” pod drive for yachts, a high-end pedicure spa, underwater diving machines, and ATV’s. They worked together to spearhead the design of a marine propulsion system that Boating Magazine called, “The Most Innovative Drive of Decade”. The 18-month project from concept to production won first place in Design News’s “Design of the Year Award” and the State of Wisconsin’s Governor’s Award, and it was listed as one of Popular Mechanics “Best Of New Designs.” Dave and Tim’s first venture together grew to 74 employees and $7M+ revenue in only 10 years.