ram air affect which affords the FlatsŪ Cat to run smoothly across the top of
the waves also serves another function when entering shallow water. As air passes
under the bow and approaches the inside walls of
the Cat Hulls, the water under the boat is compressed slightly and in turn rebounds
up into the water channel of the twin hulls. It is here that the water comes in
contact with the sub-hull. The sub-hull is a slightly downward curve about one
third of the way back from the bow. The purpose of the sub hull is to purge most
of the air out of the water that is flowing into the Cat Hulls. The water is then
wedged or trapped in between the Cat Hulls by the patented reverse angle inside
hull wall. When the water passes under the transom, a jet effect is formed compacting
the water even more and aiding in forward motion. When the water exits the transom
it explodes up into the lower unit and propeller of the outboard which
allows for good handling characteristics, and more than adequate water pressure
for engine cooling. At speeds exceeding 20 MPH the FlatsŪ Cat Hull has 1/2"
draft, meaning the boat is on top of the water, not pushing through it. When entering
water that is 7" or less in depth, the water is compacted between the hull
and the bottom creating a lifting effect which raises the boat to about 1/2"
plus draft. This means that the keel-less Flats Cat will not hit sub surface strata
while there is any water below the boat at speed. However, when equipped with
a tilt and trim engine and a standard 5" Jack Plate, skeg drag will occur
in about 3 1/2" of water, signaling the boat operator to seek deeper water.
This is a built-in safety factor for shallow water running, which has been well
received and appreciated by our boat owners.