3.1 General Lcac Characteristics

Front 1

Primary purpose of an LCAC

Back 1

high speed ship to shore, transports passengers/ equipment "over the horizon"

Front 2

Purpose of LCAC (Con't)

Back 2

Provides civil/ humanitarian relief- can deliver life saving supplies and equipment to otherwise inaccessible sites/ provides medvac

Front 3

Two operating conditions of an LCAC

Back 3

On cushion- Rides cushion of air with small gap between tips of fingers and water

Off cushion- (boating mode) A floating barge

Front 4

The LCAC is propelled by:

Back 4

2 ducted propellers mounted aft
2 bow thrusters
4 (ET40B) engines
4 Double entry centrifugal fans

Front 5

Lift fan flow percentage to bow thruster and cushion

Back 5

60% cushion
40% Bow thruster

Front 6

Percentage of THRUST from bow thruster and propellers

Back 6

Propellers- 80%
Bow thrusters- 20%

Front 7

LCAC increase shoreline landing sites from 17% to:

Back 7

70%

Front 8

LCACs are compatible with how many ship classes?

Back 8

6

Front 9

What support ship classes support LCAC operations/ how many LCAC can be transported on each?

Back 9

LHD-1 (3)
LHA-1 (1)
LPD-4 (1)
LPD-17 (2)
LSD-41 (5)
LSD-49 (2)

Front 10

HULL length

(less cushion)

Back 10

81' 10"

Front 11

LCAC length on cushion with deep skirt

Back 11

91' 9.5"

Front 12

HULL beam width

(less cushion)

Back 12

46' 10"

Front 13

Beam width on cushion with deep skirt

Back 13

47' 10" @ design N2

49' 2" @ reduced N2

Front 14

Hull borne height

(light payload)

Back 14

17' 2.5"

Front 15

Hull borne height

(heavy payload)

Back 15

16' 6"

Front 16

Height

(Off cushion)

Back 16

19' 2"

Front 17

Height on cushion with deep skirt

Back 17

25' 10" @ design N2

24' 4" @ reduced N2

Front 18

Height on cushion, mast extended, with deep skirt

Back 18

34' 5.5"

Front 19

Craft design weight (SLEP LCAC)

Back 19

344,658 lbs

Front 20

Hover height

Back 20

7'

Front 21

TACW
(total allowable craft weight)

Back 21

mission dependent

Front 22

MACW
(maximum allowable craft weight)

Back 22

389,984 lbs

Front 23

Baseline light craft weight with no fuel

Back 23

211,533 lbs

Front 24

Buoyancy box- comprised of what decks

Back 24

cargo deck
second deck ( lower skin of craft)

Front 25

Buoyancy box-
How many water-tight compartments?

Back 25

45

Front 26

Buoyancy box-
How deep is the buoyancy box

Back 26

3.5'

Front 27

What material are LCACs primarily composed of

Back 27

5456 marine aluminum alloy

Front 28

Cargo deck-
How many longitudinal tie down rails are there?

Back 28

4

Front 29

Cargo deck-
Constructed of what thickness aluminum?

Back 29

3/8"

Front 30

Ramps-
constructed from what?

Back 30

welded aluminum plate

Front 31

Length of Bow ramp

Back 31

28' 4"

Front 32

Length of Stern ramp

Back 32

14' 10"

Front 33

Ramps can be raised manually using a:

Back 33

Hydraulic hand pump

Front 34

The superstructure includes:

Back 34

(CCM) Command and control module
(PEM) Personnel and Equipment module
APU modules
Lift fan modules
Prop shrouds

Front 35

How many persons can be transported in the CCM?

Back 35

7 seats in lower deck
5 seats in upper deck

Front 36

How many Passengers can be transported in the (PEM)

Back 36

17 total
16 pax/ 1 load master

Front 37

how many non-combatant Passengers can fit, not including crew

Back 37

23

(7 ccm, 16pem)

Front 38

Combat loaded troops decrease capacity by what percent?

Back 38

20%

Front 39

Purpose of Prop shroud

Back 39

Directs air for thrust

Front 40

Length of prop shroud

Back 40

14'

Front 41

Purpose of the deep skirt

Back 41

Skirt keeps air contained under craft, the flexibility of the skirt enables the craft to remain on cushion in rough sea and over land

Front 42

Weight of skirt

Back 42

16,000 lbs

Front 43

Skirt is made out of what material:

Back 43

nylon impregnated neoprene

Front 44

Skirt fingers are made out of what material

Back 44

Nylon impregnated rubber

Front 45

Skirt system is constructed of how many segments?

Back 45

12
(1 FWD)
(1AFT)
(5 PORT)
(5 STBD)

Front 46

Skirt segments consist of :

Back 46

Outer and inner bag assemblies

Front 47

Purpose of lateral stability seal

Back 47

lateral stability seal divides the air cushion into two chambers,restricting movement of cushion air

Front 48

What type of skirt fingers are on the aft segment

Back 48

Reinforced planning cone fingers

Front 49

Cushion interior length

Back 49

79'

Front 50

Cushion interior beam

Back 50

40' 6"

Front 51

Cushion area

Back 51

3,136 SqFt

Front 52

Cushion pressure (design weight)

Back 52

104 ft lbs

Front 53

Cushion splice hardware

Back 53

magna grip lock bolt