The eTug is a Piper PA-25 Pawnee fitted with a General Motors LS1 V8 347 Cubic inch (5.7 litres) capacity, all-alloy automotive water cooled engine driving a three blade composite 84 inch diameter propeller.

VH-CUR has been developed by a syndicate in NSW with a goal of using automotive engines and fuel for glider launching. With much cheaper engines and lower cost fuel and burn-rates, it offers the potential for significant launch cost reductions. A water-cooled engine allows shaving time off the descent as there is much less chance of shock-cooling the cylinders.