[quote]Yo Momma wrote:
The boats I work on are 11M RIbs, powered by twin Cat diesels and Kamewa jets. I have operated these boats in sea states from pond-like glass, to big Pacific rollers, to East Coast 8 footers. The Pacific tends to roll, so it is easy to time the crests and keep the boat in the water without bow plunging. The Atlantic, on the other hand, tends to be more chaotic, with sharper waves and little or no set pattern. So the boat inevitably ends up in the air when we run in these types of seas. As many times as I have launched my boat, I have never seen a boat ‘stall’ because the jets run dry. The jet drive itself is completely separate from the inner workings of the engine. The engine will continue to turn even if the boat is on a trailer. You would burn up the raw water impeller if you did this(raw water impeller sucks seawater into the cooling system to cool the jacket water, or coolant), but the jet drive itself would be unharmed.
As far as the system clogging, the only thing I have sucked into the actual drive portion that caused a problem was a sheet of 1/2 inch neoprene which shredded in the drive impeller and then jammed the system up(boat still ran, albeit much slower at higher RPMs). I suppose it could be possible to suck rope or something in, but I’ve never done it. If you suck stuff into the cooling system(which is much more common), then you can overheat and, again, burn up your impeller. Don’t know about civilian boats, but ours have strainer baskets in the system to catch anything sucked in, such as sand, garbage, shrimp, whatever. In this case, you would just open the top, pull the basket, dump it out and rinse it, and then slap it back in. No worries.
THe thing about it being for flatwater boating only, I’m guessing you meant the Yamaha boat itself?
The OP provided a link to his civilian boat of interest that has all the stats. It sure ain’t your 36 foot RIb, that’s for sure. But even if we assume equal overall length, horsepower, fuel capacity, etc. wouldn’t a solid hull boat still move through the water and handle quite differently than an inflatable boat? Just wondering if those big military inflatables handle as “squishy” as my 12 foot inflatable Zodiac dinghy with a 2 horse outboard. Guess not!
The larger inflatables have have stiffening strakes on the bottom of the tube to keep them from folding.
I recently saw an inflatable catamaran with a 40hp outboard that was badass, turned on a dime at 30mph. Funny thing was, he tried pulling a tuber but couldn’t get it on plane.