Lightest ones have been in the 17-18 lb range (dry). Lighter the turbine the better - most R54's need nose weight, so add that to the list of items that may help reduce overall weight. Would be tough to reduce weight of the retracts, they are already very light. Also, guys with the lighter R54s report floatiness on landing. They've just never seen a jet land that slow. Reduce overall weight by a pound or two and you will see amazingly slow landings!!!