The belt drive is the shock absorber for the Scavenger. This eliminates costly repairs to the machine for when you do run it aground. Scavengers are made to take the punishment of rocks and weeds encountered in shallow water applications. The see through guard enables you to monitor the drives condition. The belt, Kevlar reinforced, can be easily replaced and is an "off the shelf" product. The propeller is designed to keep debris out of the bearing area, ensuring long life of the sealed bearings.