Originally Posted by Tim M
I would say if you're planning to do a lot of watersports with it along with buzzing around in sheltered waters and picnicking on the beach then a jet RIB is spot on. If more serious stuff (like going around the Isle of Wight or similar) is the plan you'll be better off with a more traditional outboard powered RIB with jockey seating (small jet ribs don't like the rough stuff much!). Much safer than something with an outboard when you've got people in the water. Beaching is also a lot easier as you can nudge it up onto the beach without having to worry about the prop and making sure the leg is deep enough to get enough cooling water. Avon is obviously a respected brand. I like Williams but they are quite pricey. With regards laughing it, you'll have no problems launching something of around 4m single handed on a shallow slip.
You shouldn't run a jet pump in less than 24" of water not so different to a small OB, also a small OB isn't as affected by a pebble, or a brush with some weeds (weed at low rpm will choke any small jet even the bigs ones, at high rpm it's fine but low rpm is a real pita..... Seen 1800cc supercharged skis choked by weed (much weed on Windermere?)
I would be concerned about parts for the older Avons the main engine bits are probably easily found but Avon specific bits may be an issue
If you do go look at one I suggest you water test under full load not just run on a hose........
Also get the pump,assembly checked any more than a rival between the impeller and wear ring and its strip the pump (not sure what the pump they used is?)