Please excuse my ignorance. I am only a beginner.<br /><br />I have just purchased for our Scouts a second-hand 13 foot aluminium tinny. I now need to buy an outboard motor.<br /><br />How can I tell whether I need a long shaft or short shaft? Is it based on the distance from the top of the transom to the very bottom of the keel? Does anyone know of a website where all is explained?<br /><br />Appreciate any help. Thanks,<br /><br />David<br />dgolding@gtlaw.com.au<br />Sydney, Australia