RB-S Study Guide
Courtesy of SN Meredith Hodgin
www.boatswainsmate.net

Missions
o Defense Operations (DO)
o Port Safety and Security (PSS)
o Recreational Boating Safety (RBS)
o Marine Environmental Protection (MEP)
o Enforcement of Laws and Treaties (ELT)
o Marine Safety and Security (MSS)
o Search and Rescue (SAR)

Physical Characteristics
o Design length of hull:
o Length overall:
o Length at waterline:
o Beam overall:
o Operation draft:
o Highest fixed point above waterline:
o Highest fixed point on trailer:
o Highest fixed point on trailer:
o Crew capacity:
o Passenger capacity:
o Fuel tank capacity:
o Propulsion Machinery:
o Propellers:
25’2 ½”
29’6 ½”
22’8 ½”
8’6” (including collar)
39” (DIW with engines vertical)
8’9”
11’1 ½” (with anchor light)
8’10” (with anchor light down)
4
6
105 gallons
Twin Honda 225-HP, 4-stroke outb.
14” x 19” Mercury Offshore/Vensura
Operational Characteristics
o Maximum speed:
o Cruise speed:
o Maximum range at cruise speed:
o Maximum operating winds:
o Maximum operating seas:
o Maximum towing capacity:
o Maximum offshore:
o Outside air temperature:
o Outside water temperature:
o Operation in ice:
46 kts at 6000 rpm
35 kts at 4800 rpm
150 NM
25 kts
6’ (no surf)
10 displacement tons
10 NM
0 to 105F
28 to 95F
NONE
Construction:
o Hull:
o Cabin:
o Fuel Tank:
o Seats:
o Windows:
o Cleats:
o Tow Bitts:
o Lifting Eyes:
5086 Marine Grade Aluminum
5052 Marine Grade Aluminum
¼” 5086 MGA with Rubber Isolation
4 Pneumatic Suspension Seats
14 (2 sliding/escape), 6 small tinted
6- 10” aluminum standard cleats
2 with Norman pins (gun mounts)
4 rated at 9500 pounds


RB-S Study Guide
Courtesy of SN Meredith Hodgin
www.boatswainsmate.net

Miscellaneous
o Electric Cabin Dewatering Pump: 1100 GPH, auto on at 2 1/8”
o Fire Extinguishers: Two B-1 type, 2lbs of dry chemical agent (Ammonium
Phosphate); will discharge 9-10 secs after handle activated; designed to
work on A, B and C fires

Boat Systems
o Propulsion System: Twin Honda, 225 HP at 5500 RPM, four-stroke, V6,
water-cooled engine with a single overhead cam
o Lubrication System: SAE 10W- 30 (30 weight), API standard, 8 U.S.
quarts. Gear case: 1.24 quarts of SAE 90 outboard motor gear oil
o Engine Cooling System: Raw water cooled, impeller type pump and
thermostat; two cooling water intake ports are on port/stbd side of lower
outboard, also has cooling system indicator on stbd side of cover
o Engine Fuel System:



Electric-powered Mechanical Fuel Pump: provides fuel to each
cylinder as metered by an electronic fuel injection system
Priming Bulb: primes and pressurized fuel system for starting
Water Separator: visual indication of water in fuel
o Ignition System: Fully transistorized battery ignition system with six spark
plugs and six ignition coils
o Fuse Panels:


Side-mounted: Houses 10-amp, 15-amp, and 30-amp fuses for the
ignition switch circuit, power trim/tilt switch circuit, and electric
starter circuit
Top-mounted: 150-amp alternator/charging circuit
o Manual Relief Valve: Insert screwdriver in manual release valve and turn
screw, engine can be manually tilted and locked
o Tilt Lock Lever: Supports engine in the fully raised position
o Sacrificial Zinc Anodes: Protects outboard motor from corrosion
o Know about the 1) Engine Kill Switch, 2) Engine Controls/Throttles, and
3) Power Tilt Switch
RB-S Study Guide
Courtesy of SN Meredith Hodgin
www.boatswainsmate.net

Hull
o
o
o
o
o
o
5086 Marine Grade Aluminum
Deep-V Mono-Hull With Pointed Bow and Flat Transom
Bottom Plating:
¼” (5086 MGA)
Decks and Side Plating:
3/16” (5086 MGA)
Beaching Plate:
¼” (5086 MGA)
Fixed Fender System (still has sufficient buoyancy and stability without
fendering system attached)
o Sound Insulation: 2-part, maintenance free, polyurethane foam covers
bottom 4” of hull

Collar
o
o
o
o
SAFE (Secured Around Flotation Equipped)
Provides flotation, fendering and stability
Solid, closed-cell, polyethylene foam
Collar attachment bolts thread into ultra-high molecular weight plastic
blocks located at the collar attaching gussets

Steering System
o Hydraulic Steering Cylinder: front-mount system that is compatible with
twin-engine, independent tilt; has a five-turn lock-to-lock response; rated
for up to 600 HP on a counter-rotating, twin-engine application
o Tie Bar Assembly: ½” solid, stainless steel rod, with adjustable ball joint
on one end and a rod end connector on the other; provides equal, uniform
directional control of the engines but does not interfere with independent
trim, tilt and throttle
o Helm Pump Assembly (HPA): on the console, wheel is attached to 5/8”
shaft on PA; hydraulic lines from the steering cylinder connect into the
rear of the HPA; an expansion tube/vent is installed in the top of the pump
to allow for additional fluid expansion

Propulsion Fuel System
o 100 Gallons (95%), 105 Gallons (100%)
o Tank construction: ¼” 5086 MGA, transverse baffles restrict free surface
movement of fuel
o Shock absorbent rubber isolation pads mounted on bottom
o Doubler plates isolate the tank from mounting brackets
o Rubber mounts isolate the tank from the hull
o Fuel Tank Vent Line: connects fuel tank to vent
o Fuel Filter/Water Separator: 60 GPH, 10-micron disposable filter (clear
bowl to check for presence of water in fuel)
RB-S Study Guide
Courtesy of SN Meredith Hodgin
www.boatswainsmate.net

Electrical System
o Consists of two engine-driven alternators, two starting batteries, one
accessory battery and control devices and indicators
o Two engine-driven alternators: provide charging power for boats’ batteries
12 VDC, 60 amps at 2300 RPM / 48 amps at 1000 RPM
o Three 12-V gel-cell batteries

Heating System
o 12,000- BTU combustion heater, uses diesel fuel (2.5 gal tank)
o Draws air from outside combustion (25%) and mixes it with cabin air
(75%)
o Incorporates an internal electric fan for air circulation, a self-contained
ignition system for igniting the fuel and a fuel pump
o 30-amp breaker connects the heater to the 12-VDC electrical system

Trailer System
o E-Z Loader
o Primary Frame: 4” by 6” aluminum I-beam
o Torsion Axle suspension system
o 6-wheel configuration
o LEDs used for trailer brake, tail and clearance lights
 Procedure Particulars:
 Factory trailer hitch ball coupler is 2 5/16”
 Wheel lug nuts tightened to 85ft/lbs

Performance Monitoring
o Overheating Indicator: Red Light, engine speed will be gradually reduced
to approximately to 1800 RPM and the engine will stop after 20 seconds
 2 overheat sensors on engine activate indicator through ECM
 Honda 225-HP require approx. 12 PSI water pressure with
minimum of 5 PSI to maintain adequate cooling
o Oil Pressure Indicator: Green Oil Light Will Turn OFF, if at cruising,
ECM will gradually decrease engine speed
 Light activated below 23 PSI at 1800 RPM
 Stop engine, service oil level
o Alternator Indicator: Red Light, malfunction in charging system
 Each alternator rated at 12 VDC, 60 amp at 2300 RPM and
produces 48 amps of power at 1000 RPM, protected by 150-amp
fuse
o Programmed Fuel Injection Indicator: Red Light, ECM activated by one of
nine engine mounted sensors, carefully monitor performance, stop if
deteriorates
o Helm Dash Panel: Trim tilt indicators, Tachometers (650 +/- 50 RPM
Idle), Fuel Totalizer
RB-S Study Guide
Courtesy of SN Meredith Hodgin
www.boatswainsmate.net

Casualty Control
o Capsizing:
 Inflate PFDs (exit through side/slide windows)
 Account for all crewmembers
 Try to determine if EPIRB floated clear of hull and deployed
 Stay as close to boat as possible, climb atop of capsized hull to aid
in SAR efforts
o Steering Casualty
 Crew: investigate the casualty and report status, cause and
estimated time of repair (ETR) to cox’n
 Cox’n: notify station/OOD
 Crew: check for steering fluid in the stbd aft compartment and well
deck, around helm pump and adjacent to the transom near the
steering actuator
 Ensure all lines and fittings in the steering system are installed and
tight-----Report to Cox’n
o Loss of Control of Engine RPM
 Crew: investigate the casualty and report status, cause and ETR to
cox’n
 Check: 1) Throttle and shift control cables and 2) Throttle arm on
engine---Report to Cox’n
 If necessary secure engine while in gear
 Cox’n: notify station/OOD
o Loss of Fuel Pressure
 Crew: investigate the casualty and report status, cause and ETR to
cox’n
 Verify fuel tank level at the gauge on console, sound the fuel tank
to double check
 Crew Check: 1) Fuel in aft compartments or around covers, 2) 2nd
fuel filters, 3) Fuel lines for holes or loose connections, 4) Fuel
filter and water separator for contamination---Report to Cox’n
 Cox’n: notify station/OOD
o Loss of Lube Oil Pressure
 Crew: investigate the casualty and report status, cause and ETR to
cox’n
 Cox’n: secure engine
 Crew Check: 1) Outboard area for oil, 2) Oil level on dipstick,
3)Check spin-on oil filter tight, and 4) Check oil drain fitting for
security-----Report to Cox’n
 Cox’n: notify station/OOD
RB-S Study Guide
Courtesy of SN Meredith Hodgin
www.boatswainsmate.net
o Engine High Water Temperature
 Crew: investigate casualty and report status, cause and ETR to
cox’n
 Cox’n: bring engine to idle and stop
 Crew Check: 1) Abnormal temperatures on engine cover, 2) Steam
around engine cover, and 3) Obstructions in cooling water intake
screen-----Report to Cox’n
 Cox’n: notify station/OOD
o Damage to Collar
 Crew: investigate casualty and report status, cause and ETR to
cox’n
 Crew: Check physical condition of collar---- Report to Cox’n
 Cox’n: report casualty, disabling or restrictive to OOD; RTB
depending on extent and OOD
o No Power/Insufficient Power to Communications and Navigation
Equipment
 Crew: investigate casualty and report status, cause and ETR to
cox’n
 Verify alternator output on voltmeter for each engine
 Check position on power panels of all breakers and switches for
affected equipment----- Report to Cox’n
 Cox’n : notify station/OOD