How to measure outboard shaft length the right way

If you're getting ready to repower your boat or buy a new motor, you absolutely have to know how to measure outboard shaft length before you spend a single dime. It sounds like a simple task—and honestly, it is—but getting it wrong can lead to a massive headache once you're out on the water. If the shaft is too long, you're creating unnecessary drag and potentially hitting rocks in shallow water. If it's too short, your prop is going to suck in air instead of water, and you won't get anywhere fast. ...

February 28, 2026 · 7 min · Briese Winhold