I am new to sailing. I am an ex cooperate jet pilot and flight instructor. I understand the dynamics of a propeller in the air. Just wondering if when sailing does a free wheeling prop (eng in neutral) create more drag than a stopped prop? If so how much difference? In a propeller aircraft a stopped prop can offer considerably less drag. Talking to the mechanic who works on my engine he claims it will do no harm placing the engine in gear after shutdown.