Currently in design are a range of rugged marine drive units to suit different horsepower inboard engines whether petrol or diesel. Particularly suited to commercial and military rib applications and other fast boat types they offer a simple but strong and easily maintained unit that enables safer beaching and good maneouvreability yet still have good high speed performance and economy. Able to operate in shallow waters similar to a waterjet where debris may be present and at the same time offer good performance, this is a unique concept that will offer fast boat operators a good alternative. They can be fitted to all Carson Ribs or supplied to other fast boat users.