Choosing the right shaft length

This is dictated by depth of your boat's transom, as measured from top to bottom in the centre. If your boat is about 15"-16" you will need short shaft and if it is 20"-21" you will require long shaft. Small inflatables and dinghies tend to require 'short shaft' whilst larger boats usually require long or ultra long shaft. Auxiliary engines for yachts usually require long shaft. We are often asked if shaft length is really critical when people are changing boats and want to keep their existing engine. There's no doubt about it, you must have the right length for the engine to operate efficiently and safely.