BM3 Ops And Seamanship Flashcards
What is displacement?
The weight of the vessel measured in long tons. *long ton is 2,240 pounds
What is critical speed?
The max speed a displacement hull will travel before requiring excessive power. 1.34x the square root of the waterline.
What is light displacement?
Weight excluding fuel, water, outfit cargo, crew and passengers.
What is loaded displacement?
Fuel, water, outfit cargo, Crew and passengers
What is dead weight?
The difference between light and maximum loaded displacement.
What are lines measured by?
Circumference
What is wire rope measured by?
Diameter
What is right hand lay known as?
Z
What is left hand lay known as?
S
What is Manila line made from?
Abaca plant
What is marlin line made from?
Hemp. * does not recover from being stretched.
What is the main component in natural fiber line?
Cellulose
During bending, line strength may decrease up to __ times.
5
Damage to internal natural fiber lines occurs when a line is under strain greater than ____% of it’s breaking strength
75%
Cockles can reduce the strength of a line by as much as ___.
1/3
If the circumference of a line is reduced by ___% or more, the line should be replaced.
5%
Rust that extends into the cross section of a line can lower the strength by as much as ___%.
40%
A knot can reduce the strength of a line by as much as ___-___%.
50-60%
A splice can reduce the strength of a line by as much as ___-___%.
5-10%
The eye of a line should be __ times the diameter of the line.
6
For three strand line how many tucks are required for natural line?
3
For three strand line, the number of tucks for synthetic line is__.
4
Markings for splicing line:
R- length of fid
X- desired loop size (where the core will come out)
Z- 1/2 fid from X towards the slip knot
Slip knot is 5 fid lengths towards the standing line.
How many wraps including an extra foot are needed for temporary whipping?
15-20
For temporary whipping, also known as common whipping, how many times the circumference the line is needed?
10
What is the most commonly used and most practical method of seizing?
Round seizing. Marlin is the most common used and the smallest.
What is the rule of thumb in figuring what size cleat is needed with the size of line?
The line should be 1/16 in diameter for each inch of cleat. Example: For 1/2” line, an 8” cleat would be used.
What is the minimum lbs of buoyancy for a type III PFD?
15.5 lbs
If a type III is worn without a SAR vest a ____ and ____ are required.
Strobe light and whistle
Mustang survival MD3031 has ___ inches of reflective tape and provides ___ lbs of buoyancy.
64 inches, 35 lbs
The hydrostatic release of the inflatable PFD will inflate when submerged __ inches or more of water.
4 inches
AEC has __-__ lbs of buoyancy.
22-45 lbs
What do you lubricate the neck seals on dry suits with?
Talcum powder
Use beeswax otherwise known as ________, to lubricate the slide fasteners.
Paraffin
The Boat Crew Survival Vest has __ storage pockets.
5
ACR firefly was tested at __ feet of depth.
33 feet
ACR firefly3 has a minimum of __ hours of continuous use at __ degrees Celsius.
8 hours, -1 C
PLB is capable of broadcasting on ___ MHz and provides a position accurate within __ miles within __ minutes.
406 MHz, 3NM, 90 minutes
What are the 4 scenarios likely to lead to capsizing the RBS?
- High speed maneuver
- Boarding operations
- Extreme seas/surf
- Towing
Water less than __ degrees F can lower your body temperature, robbing your body of heat __ times faster than air.
70 degrees, 26 times
A member in water temperature of 50-60 degrees F has an expected survival time of __-__ hours.
1-6
Life rafts must meet or exceed __________.
46CFR160.051
Life rafts have a __ year service life.
20
Stokes litter floats face up at a ___ degree angle.
45
The top __-__ inches will stay above the water.
18-24
There is a __ lb buoyancy weight on the bottom of the stokes litter.
5 lb
Stokes litter has __ retaining straps.
5 Gray Black Blue Red Green
Floatation shall consist of a chest pad, floatations tubes, ballast bar, and _______ straps.
Restraint
Time spent at a sheltered anchorage can reduce the maximum underway hours for crew on watch by __%.
50%
“Heavy weather” is defined as sea and swell conditions combining to exceed __ feet and/or winds exceeding __ knots.
8, 30
What does AFFF stand for?
Aqueous film forming foam
Carbon dioxide is ___ times heavier than air.
1.5
Maximum speed of HH-60C Dolphin?
165 knots
Maximum crew endurance of Dolphin?
3 hrs
Hoist capacity of Dolphin?
600 lbs
Maximum speed of HH 60J Jayhawk?
180 knots
Jayhawk max endurance?
6 hrs
Hoist capacity of Jayhawk?
600 lbs
The trail line consists of ___ feet of orange polypropylene line.
105
Weak like is rated not to allow more than ___ pounds of force to be applied to the hoist.
300
Hoists normally require a wind speed of __-__ knots off the port bow __-__ degrees relative.
15-30, 35-45
The angle on a two-legged pendant shall never be more than __ degrees.
30
Mk-127 must be fired at a __ degree angle.
90
What does VOC stand for?
Volatile Organic Compounds
In confined spaces, vapors shall be kept below __% the lower explosive limit.
10%
Paints shall contain no more than __% lead by weight.
.06%
Paint Storage Life: unopened two part epoxy paint __ years.
10
Paint Storage Life: opened but mixed two part epoxy paint __ years.
3-4 years
Paint Storage Life: Water/oil unopened __ years?
3-5
Paint Storage Life: Water/oil opened __ years?
1 year
Storage cabinets must be in compliance with National Fire Code # __ ?
30
Made of at least __ gauge steel?
18
Storage cabinets are floored with ___ inch air space between inner and outer surface.
1.5
Maximum amount of flammable product allowed in any one cabinet?
60 gallons
Maximum amount of combustible products allowed in any one cabinet?
120
Paints consist of two principals: _______ and _______.
Solid pigment and liquid vehicles
Best temp to mix paint is __-__ degrees F.
65-85
______ is the mixing procedure where material is repeatedly poured back and fourth between toe containers.
Boxing
_______ is the required time after mixing of the components where te critical chemical reaction is allowed to initiate prior to application.
Induction time
______ paint dries by oxidation.
Varnish
______ paint dries by evaporation.
Lacquer
What is safety factor?
The ratio between the breaking strength of a rope and the total applied load. Minimum safety factor is 5:1.
Shackles shall be constructed of ____________ and should be ____ pin or ____ pin type.
Forges alloy steel. Screw pin, bolt pin
Rated load test is ___% of the WLL.
100%
Dynamic load test is ___% of the WLL.
125%
Static load test is ___% of the WLL.
150%
Light characteristic, what is Occulting?
Light is mostly on, with brief off periods regularly repeated.
Light characteristic, what is isophase?
Light is on and off for equal periods of time.
What does IALA stand for?
International Association of Lighthouse Authorities
Published by the USCG (7 volumes)
Light List
Published by National Geospatial Intelligence Agency
List of Lights
An actual NM is ____ feet or ____ yards.
6,076, 2,025
______ is the water depth measured at the mean lower low water.
Datum
How many colors are on a chart?
6, buff, green, white, blue, black, magenta
What are the 2 types of lettering on a chart?
Slanted and vertical
Slanted are those items items affected by tide while vertical is not.
Compass rose: ______ direction is the outer ring. ______ direction is the inside.
True, magnetic
Fathometer: sharp, clear flash
Hard bottom
Fathometer: broad, fuzzy flash
Soft, muddy bottom
Fathometer: multiple, fairly sharp flashes
Rocky bottom
Lead line lead weight of __ to __ lbs.
7-14
What form is the standard bearing book?
OPNAV Form 3530/2
In the CG, small arms are defined as all weapons of __ caliber or less and shotguns.
.50
The interval between monthly inventories shall not be less that __ or more than __ calendar days.
23, 35
Temp Transfer of ammo/ small arms: “temporary” is defined as a maximum of ___ days.
30
What does NAR stand for?
Notice of Ammunition Reclassification
Law enforcement belts, holster, or storage pouches shall be made of either ______, _______, or ________.
Black ballistic nylon, polymer, or black leather.
What is Standard Ride, in regards to belt mounted holsters?
Holds the pistol grip no lower than 4 inches below the belt.
The aerosol must contain no greater than __% and no less than __% OC concentration.
10, 5
The SLTG has a security risk category of __.
IV
Percent of line BS loss for square knot.
46%
Percent of line BS loss for Bowline?
37%
Percent of line BS loss for becket bend?
41%
Percent of line BS loss for eye splice?
5-10%
A ____ knot may be used to prevent an un whipped line from un laying.
Crown
