"Roger Long" wrote in
:

The real efficiency for a boat running around doing research in a
shallow bay is being able plow through an oyster bar if there is a
navigational error and still being operational as opposed to needing
to be towed immediately to a shipyard where they would spend the
better part of a year's


Is there anywhere I can see a cutaway of what the pump looks like, inside.
My experience is with jetskis and small, single impeller jet boats. If
these pumps suck in anything bigger than a dime, it wedges itself in
between the impeller's aft end and the stator's forward end, destroying the
pump, most times catastrophically, i.e. they explode.

Those pumps must have some way to keep the rocks passing through the moving
parts and not getting wedged in between the moving parts and the static
parts that keep the flow from being rotational, instead of straight back
power.

We're very careful not to get Mercury Sport Jets and jetski pumps anywhere
near anything solid it can suck up. The bar gaps in the intake grates is
way too far apart for efficiency to filter out the rocks that will destroy
them.