In the distance today while out paddling I saw two pedal-powered kayaks
(Georges River - Sydney Australia). Interestingly they both had a pair
of fixed wheels sticking up in the air behind the cockpit. I imagine
that they are some sort of transport system for when on land.
Does anyone know of a model like this?

In the states there's a pedal-powered kayak made by Hobie. Works by
moving two flippers from side to side below the kayak. There's a lever arm
to the rudder. It's a sit-on-top design and the whole pedal mechanism can
be lifted out.
There was one on a trip I was on in the NJ Pine Barrens and the flippers
flipped back neatly as the kayak went over shallow logs or sandbars so there
was little restriction due to water depth.
Haven't seen permanently mounted wheels but not a few paddlers have
them, often carrying them on the back deck...

Joe P.