I have a little inflatable boat I got for a hundred bucks as a dinghy. Folds up really small and I have one of those ryobi 18v inflators that fills that sucker in less than 5 minutes. I got mine for $100 but it is missing the floor. Still sort of works but I need to get some PT plywood or somesuch. Also doesn;t have oar locks which is a pain. Here is one on ebay but it is seriously overpriced. For that money buy a real inflatable. The ice thing about this one is it is light and has nylon protecting the tubes. The intex mariner or somesuch looks pretty decent for as cheap as it is.
I use an Intex Seahawk II, fold it up under the companion way steps & pump it up on deck with an electric pump I carry when I'm going to use it. I also bought a bridle to tow it out the back so I don't always have to deflate. It works well for me.
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Even though this is 4 year old thread still may help/or be of interest to some...
When cruising any distance I carry my 9.5 Ft soft floor inflatable on board deflated and then inflate and will tow without motor short distances.
My small 30 fter will lose as much as a half knot towing. I also have a self made bridle that turns itself into a 4 point lifting sling to
lift dinghy on side or fore deck using halyard. (i deflate tubes when on fore deck as not a lot of room).
tschmidty's old post of needing a floor for his basic dinghy reminds me that for years I tooled around in a similar dink
that I had cut a piece of hard foam insulation (was pink 1.5 or 2" thick) to size of floor of dink and when dinghy was inflated
floor became locked into place and was nice and rigid. Floor fit under bunk just right.