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Elco 80' Hull Construction
Elco PT Boat Outboard Profile Plan

Updates


2010 April 10 update: Deck construction table added.

2010 February 7 update: Deck beam dimension table to Elco drawings added.

2010 January 11 update: Hull profile drawing updated to Elco drawings.


The following information is based mainly on Elco drawings. Dimensions given were found on the drawings or derived from them. They represent a best effort on my part, please confirm dimensions and information given here for yourself if errors cannot be tolerated. Images are for non-commercial personal use only, please obtain permission for any other use.


Hull profile
PT Boat Hull Profile


The following image shows hull sections located at the stations. Stations are evenly spaced 88" divisions along the LWL (length on water line, not the same as the painted W.L.). The LWL is 73' 4" (880") and goes from station 0 (68" aft of foremost point) to station 10 (948" aft of foremost point) with st 1/2 added between st 0 and st 1. I have straightened it the best that I could. The blue lines were added as guides for straightening. A larger version is Here.

Derived from Elco lines drawing 3000, available at ptboats.org
PT Boat BOS Elco Plan 3000 Lines Plan Frame Stations


Deck camber layout
Deck Camber Layout


Elco 80' PT Boat Deck Beam Table
Deck Beam Number Sided (depth) Molded (height) Material
10 - 12 - 14 - 16 - 18 - 20 7/8" (.875") 1 3/8" Oak
30 - 31 - 38 - 40 - 49 - 50 - 53 - 54 - 57 - 59 - 63 - 67 1 3/8" (1.375") 6" Mahogany
64 - 66 - 68 7/8" (.875") 3" Mahogany
All others 1 1/8" (1.125") 6" Mahogany
Changes:
PT 486-545, 731-760, : Frames 10 - 12 - 14 - 16 - 18 - 20 molded changed to 3", material to mahogany.
PT 565-624: Same as above except frame 16 sided changed to 1 1/8" (1.125")", molded changed to 6".

Notes:
PT 139 and on drawings state regular, light, (and "intermediate" on the early drawings) deck beams.
center over side frames, heavy beams have after face flush with after face of frames.

Information is based on Elco deck framing drawings.


Elco 80' PT Boat Deck Construction Table
Boat Number Construction Dimensions
103-108 Mahogany planking, 2 layers
laid fore and aft
Inner layer 5/16", outer layer 3/8"
109-196, 314-367, 372-383, 487-497,
546-563, 731-760
Mahogany planking, 2 layers
laid fore and aft
Inner layer 3/8", outer layer 5/16"
486, 498-545, 565-624 Plywood 9/16"
Notes:
Coaming sits on lower layer of planking on plank decked boats.
Coaming sits on top of plywood on plywood decked boats.
Planked boats have a layer of marine glued airplane fabric between layers.

Information is based on Elco type section drawings.


Frame Sections, 1942 Elco 80' Patrol Torpedo (PT) Boat

General Notes:
Section labels are from Elco Cabin Arrangement drawing 3008.

Section Section From Section Length Frame Spacing
Forepeak 0 to 77"
From frames 0 to 4
6' - 5", 6.417', 77" 1 frame at 29":
0 to 1

3 frames at 16":
1 to 2 through 4

Crews Toilet 77" to 155"
From frames 4 to 9
6' - 6", 6.5', 78" 4 frames at 16":
4 to 5 through 8

1 frame at 14":
8 to 9

Crews Quarters 155" to 311"
From frames 9 to 21
13' - 0", 13', 156" 6 frames at 14":
9 to 10 through 15

6 frames at 12":
15 to 16 through 21

Officers Quarters 311" to 534.5"
From frames 21 to 39
18' - 7.5", 18.625', 223.5" 12 frames at 12":
21 to 22 through 33

5 frames at 13.5":
33 to 34 through 38

1 frame at 12":
38 to 39

Tank Compartment
Crews Day Room Over
534.5" to 650"
From frames 39 to 47
9' - 7.5", 9.625', 115.5" 1 frame at 12":
39 to 40

6 frames at 15":
40 to 41 through 46

1 frame at 13.5":
46 to 47

Engine Compartment 650" to 854"
From frames 47 to 61
17' - 0", 17', 204" 1 frame at 10":
47 to 48

11 frames at 16":
48 to 49 through 59

2 frames at 9":
59 to 60, 61

Rudder Compartment 854" to 960"
From frames 61 to 69
8' - 10", 8.833', 106" 1 frame at 9":
61 to 62

7 frames at 12":
62 to 63 through 69


Frame Spacing, 1942 Elco 80' PT Boat

General Notes:
Measurements are to aft face of frames per drawings.
Frame 69 is a partial frame that intersects the transom.
** = watertight bulkheads.

Frame Number: 1 2 3 4 ** 5 6 7 8 9 ** 10
Distance Aft Of Foremost Point: 29" 45" 61" 77" 93" 109" 125" 141" 155" 169"
 
  11 12 13 14 15 16 17 18 19 20
  183" 197" 211" 225" 239" 251" 263" 275" 287" 299"
 
  21 ** 22 23 24 25 26 27 28 ** 29 30
  311" 323" 335" 347" 359" 371" 383" 395" 407" 419"
 
  31 32 33 ** 34 35 36 37 38 39 ** 40
  431" 443" 455" 468.5" 482" 495.5" 509" 522.5" 534.5" 546.5"
 
  41 42 43 44 45 46 47 ** 48 49 50
  561.5" 576.5" 591.5" 606.5" 621.5" 636.5" 650" 660" 676" 692"
 
  51 52 53 54 55 56 57 58 59 60
  708" 724" 740" 756" 772" 788" 804" 820" 836" 845"
 
  61 ** 62 63 64 65 66 67 68 69
  854" 863" 875" 887" 899" 911" 923" 935" 947"

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