This summer I worked on a river survey project on the Platte River here in Nebraska. The survey company I was working with had an airboat they used to survey the riverbed. It had a Chevy 4.3 in it but had no harmonic dampener, just the pulley. Can an airboat or other special application get away with this due to less rotating mass in the drivetrain (simple gear box and prop vs. transmission, driveshaft, diff., wheel and tire) or is this just bad judgement from whoever built the boat?