PBR 31 Mk,II
Patrol Boat River "Pibber"
Knowing that patrolling coastal and river waterways during a conflict
in Vietnam was going to be extremely hazardous, the U.S.Navy searched for
a boat design that could be quickly produced and employed. One chosen was
a fiberglass hulled pleasure craft built by Modutec Marine in Seattle
Washington. The patrol boat, river or PBR as it was known militarily,
became one of the most successful weapons systems used in Southeast
Asia. it was 31'11" long, 11'7" wide, and 9'9" high above
the waterline, it displaced 8¾ tons loaded drawing two feet of water.
It's crew of four was armed with a pair of 0.5 caliber machine guns in a
turret at the bow, a single .5 cal gun or grenade launcher mounted on a
tripod in the fantail, plus a single M-60 on a pipe mount bolted to one of
the amidships splinter shields. It was powered by two turbocharged Detroit
Diesel 205 HP, V-6 marine engine, driving a pair of Jaccuzzi 14 JY water
jetdrives. The engines were located underneath the after decking, and the
boat was steered by two movable nozzles below the water line, mounted on
the rear transom, The water intakes were located on the hull bottom. It
had a top speed in excess of 25 knots. Surface radar and two way radio
equipment provided communication and maneuvering safely.
(From Tamiya Manual)