Drawing Frames In Full Size

Sheer

Do the same for the chine

CSI CM

CM CM

Construction base for tran som

Construction base for tran som

Fishing Boat DrawingFrame Draw Boat

The beam of the various boats can be modified on the basis of the frame dimensions given in pages 6 to 10. The maximum increase in the beam is 20 % which means that the moulded beam increase from 1.85 m to 2.20 m.

As an example how this is done is taken the frames from midship and forward.

Start with the widest frame and multiply the half beam with the chosen factor of increase, in this case = 1.2. Draw a line parallel with the base line and mark off the new beam.

From this new sheerpoint, draw a line parallel with the old sideframe and transfer the length of the sideframe = B and mark off the new chlnepoint. Draw the new bottom frame. Draw a line at right angle to the side -frame through the old sheerpoint, Measure the distance C from the new sheerpoint down to this line.

On the next frame, draw a line through the sheerpoint and at right angle to the sideframe. Draw a parallel line at a distance = C.

Multiply the halfbeam of this frame with the factor =1.2 and mark off the new sheerpoint on the parallel line drawn earlier,

Transfer the length of the old sideframe = E to the new sideframe in the same way as done for the midship frame, From the new chinepoint draw the new bottomframe.

Boat Technical DrawingSteel Stairway Details

TYPE A

A timber of medium weight, between 650 kg / m3and 750 kg / m3when air-dried. This heavier timber has two important advantages compared with a lighter timber;

  1. It will hold fastenings such as nails and boits well and in a wooden boat the strength is mainly dependent on the fastenings,
  2. Heavier timber is usually more rot resistant than lighter timber and this is important in parts of the boat that are difficult to change such as frames, keel and the stem.

Through experience, boatbuilders have been able to determine which local timber is suitable for these items and it is safest to follow their advice. The more known timbers of type A are oak, iroko, kapur, afromosia, opepe, gurjun and teak, but there are many other species that might be known locally as suitable.

TYPE B

A timber of relatively light weight of between 500 kg / m to 600 kg / m3when air-dried. The timber is mainly used for planking and deck, and the most important quality is low movement in service, that it does not swell or shrink much with changing humidity. Known timber suitable for this is mahogany, Douglas fir and European redwood, but there are many other species.

QUANTITY OF TIMBER FOR THE BOATS

Below is given a list of sawn timber required for the various planked boots, Timber for the buiding jig is given on page 25.

The quantity includes a wastage factor of 25 %. The wastage factor could be lower or higher dependent on the quality and the length of timber available. Longer lengths of timber gives less wastage. However an advantage of the cross-planked bottom is the utilization of short lengths of timber.

TYPE OF TIMBER

DIMENSION FROM SAWMILL

TOTAL LENGTH OF TIMBER IN METRES

MM

INCH

5.2 M BOAT

6.3 M BOAT

7.4 M BOAT

8.5 M BOAT

A

25x150

1 x 6

7

9

10

12

38 x 150

1 V2 x6

32

39

45

52

38 x 200

1 y2 x 8

15

18

21

25

50 x 150

2x6

18

22

20

22

75 x 150

3x6

4.0

4.0

6.5

7.6

100x250

4x10

1.4

1.4

1.4

1.4

A m3

0.54

0.65

0.76

0.86

B

20 x 150

3/4 x 6

63

76

90

103

25x150

1 x 6

58

70

82

94

25 x 200

1 x 8

34

41

48

55

B m3

0.58

0.70

0.82

0.95

Total volume A + B m 3

1.12

1.35

1.59

1.81

Proper stacking of timber is important.

AIR DRYING OF TIMBER

After sawing, the timber must be stored under a roof protected against sun and rain. The drying time depends on the season. During the dry season a 25 mm plank will dry in 3 months, but it will take 9 months during the rainy season.

Proper stacking of timber is important.

20x35

PLANKED BOAT 5.2 M - TIMBER 19

FOR THE OTHER BOATS MULTIPLY THE LENGTHS WITH THE FACTOR F : 6.3 M BOAT. F = 1.2, 7.4 M BOAT: F = 1.4. 8.5 M BOAT: F = 1.6. NOTE: The keel for the 7.4 m and the 8.5 m boat is 68 x 68 sawn from 75 x 150

TYPE OF

TIMBER

DIMENSION FROM SAWMILL mm

TOTAL LENGTH m

SAWING INTO SMALLER SECTIONS mm

TOTAL LENGTH m

PLANED DIMENSION mm

ITEM NUMBER

A

25 x 150

25 1 1 1

6

20x68

©

4

50 50 50 25 1 1 1 1

12

20x44

©

38 x 150

8

38

150

8

32 x 143

©

14

38

75 75

28

32x68

©

10

38

50 50 50

30

32x44

©

38 x 200

14

200

14

32 x 193

©

38

1

100 100

2

32x93

©

38

50 x 150

7

50

150

7

44 x 143

©

5

50

75 75

10

44x68

©

6

50 50 50

12

44x44

©

50

75 x 150

2.5

75

150

2.5

68 x 143

©

1.3

75

75

75

2.6

68x68

©

100x250

1.4

100x250

1.4

93 x 240

©

B

20 x 150

57

20 i 1

57

15x 143

©

2

75 75 20 1 1 1

4

15x68

©

201 1 1 1

12

15x44

©

25 x 150

58

25 1 1

58

20x143

©

25 x 200

29

25 1 1

29

20 x 193

©

5

100 100 OS 1 1 1

10

20x93

©

How To Have A Perfect Boating Experience

How To Have A Perfect Boating Experience

Lets start by identifying what exactly certain boats are. Sometimes the terminology can get lost on beginners, so well look at some of the most common boats and what theyre called. These boats are exactly what the name implies. They are meant to be used for fishing. Most fishing boats are powered by outboard motors, and many also have a trolling motor mounted on the bow. Bass boats can be made of aluminium or fibreglass.

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