Specifications

Chapter 3 – Boat Systems
Section B. Hull System
Introduction
The boat’s hull is fabricated from 5086 marine grade aluminum. The hull’s
design is a deep-V mono-hull with a pointed bow and flat transom. The
deadrise is 25 degrees at the transom; defined as the angle between the
baseline plane and the hull bottom when measured perpendicular to the
boat’s centerline.
The hull consists of ¼-inch 5086 marine grade aluminum bottom plating.
The decks and side plating are
3
/
16
-inch 5086 marine grade aluminum. The
boat has a fixed fender system to protect the exterior of the hull during
alongside work. The boat’s hull has sufficient buoyancy and stability to float
upright with the fendering system removed.
CAUTION !
B.1. Draft
The hull’s deepest draft with the engines raised is at the step, which is on the
keel at bulkhead 1, forward of the transom (Figure 2-1).
B.2. Sound
Insulation
A layer of two-part, maintenance free, polyurethane foam covers the bottom
4 inches of the hull. The foam is flame retardant and complies with ASTM
flame spread requirements. The foam’s main purpose is to provide sound
insulation. No polyurethane foam is installed directly below the fuel tank in
the bilge area on the RB-S.
B.3.
Performance
Fins
The performance fins (Figure 3-15) are located port and starboard below the
aft portion of the collar. They provide lift upon acceleration and create a
vacuum for stabilization during turning.
B.4. Lifting
Strakes
The hull contains three custom lifting strakes (Figure 3-15) on each side of
the V bottom hull to improve seakeeping, directional stability, and planing
performance.
B.5. Beaching
Plate
A ¼-inch 5086 marine grade aluminum beaching plate (Figure 3-16) is
welded to the keel along the forefoot to provide additional protection to the
hull.
With the engines trimmed to the maximum depth and the boat making no headway,
the draft is 39 inches.
3-17