I know this is a dumb question but a search hasn't immediately revealed the answer to it even so...
Looking at what to get in the way of an aux engine for the RIB.
How do I decide/measure/work out whether I need a standard or long shaft engine? How long is standard and how long is long? Seems to be one of those things that I presume "everybody knows the meaning of" but isn't defined anywhere, or not that I can see anyway! I sort of assume that standard is for where the engine is the main engine on a small inflatable and long is probably for where the engine is fitted as an aux on a bigger boat, or am I barking up completely the wrong tree here?
Looking at Mailspeed Marine (not necessarily where I am going to buy it from, just that they have a selection of different engines on there with prices shown) there is a Honda 4 stroke 5hp for £800 and a Mariner 2 stroke 5hp for £729 so it seems to me to be worth a few quid extra for a 4 stroke - are these prices reasonable? they are about what I was expecting. I think the Honda looks like quite a good bet, bound to be fairly reliable if it is like everything Honda make on land, and I guess a 4 stroke is likely to be more reliable than a 2, which is probably a good thing in an emergency engine
and would mean no messing with mixing fuel up
Finally are there any makes of engine that are particularly "narrow" in physical size - it is pretty tight on the transom between the main engine and the tube and really the smaller the physical size of the aux engine the better. That Honda looks pretty good in the photo.