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Blackfly
Materials list, and Tables of Offsets

 

: | blackflyDWG.zip 1.1Mb |
: DWG. DES. ( COREL)  

 

Recommended Construction method: Lapstrake plywood, as described in Iain Oughtreds book, Clinker Plywood Boatbuilding, and Tom Hills Ultralight Boatbuilding.Moulds do not need to be bevelled. Forward moulds should be located aft of the station marks on the strongback; aft moulds should be located forward of station marks.

Materials:

Keel, Inner----------------------------------- 5/8" cherry, ash, or similar

Keel, Outer---------------------------------- ?" cherry, ash...

Stem, Inner & Outer------------------------ 1 ? laminated cherry, ash, doug fir, spruce or other

Transom-------------------------------------- 3/4" mahogany, butternut, spanish cedar, or similar (transom may also be built up from 3/16" ply and solid frame)

Planking-------------------------------------- 3/16" marine-grade okoume plywood, or similar.

Bottom planks (garboard, broadstrake and third plank) may be gotten out of 1/4" ply for added strength. If weight is not a concern, 1/4" may be used throughout.

Rubrails--------------------------------------- 3/4" Cherry, ash...

Gunwale-------------------------------------- 5/8" X 3/4" Cherry, or similar

Sheer clamp (inwale)------------------------ ? X 5/8" spruce

Sheer clamp spacer blocks------------------ 3/8" spruce

Floor frames --------------------------------- 1" White cedar

Breasthook----------------------------------- 7/8" cherry, ash...

Quarter knees-------------------------------- 5/8" Cherry, ash...

Mast thwart---------------------------------- 7/8" Cherry, ash...

Middle thwart and support----------------- 3/4" Butternut, mahogany, or other lightweight wood. Thwart may be narrowed to save weight, but not reduced in thickness.

Canoe-style thwart, forward---------------- 7/8" X 2" cherry, ash...

Removable thwart (aft)--------------------- 3/4" Butternut, mahogany or similar

Risers------------------------------------------ 3/4" cherry, ash...

Daggerboard trunk--------------------------- 3/16" ply panels, with cedar spacers and cherry (or other) braces & cap.

Rudder----------------------------------------- 5/8" mahogany, or similar

Daggerboard---------------------------------- 3/4" mahogany, or similar

Tiller------------------------------------------- 5/8" laminated ash, cherry.....

 

Offsets

Offsets in feet- inches-eighths to the inside of the planking

Heights above baseline

Buttocks spaced at 6" intervals from CL

STA

Sheer

Butt18

Butt12

Butt6

Keel

0

1-10-2

-

-

-

0-11-0

1

1-8-7 +

-

-

0-10-7 +

0-2-1 +

2

1-7-6

-

0-11-7

0-4-3 +

0-1-4 +

3

1-6-6

-

0-5-6

0-2-6

0-0-7

4

1-6-0

0-7-5 +

0-3-5

0-1-6

0-0-4

5

1-5-3

0-4-5 +

0-2-5

0-1-3

0-0-2

6

1-4-7 +

0-3-3

0-1-7 +

0-1-0

0-0-1

7

1-4-5

0-2-4 +

0-1-3 +

0-0-6

0-0-0

8

1-4-4

0-2-5

0-1-4

0-0-6

0-0-0

9

1-4-4 +

0-3-3

0-1-6 +

0-1-0+

0-0-2 +

10

1-4-6

0-4-4

0-2-5

0-1-6+

0-1-1

11

1-5-0

0-6-2 +

0-3-7

0-3-0 +

0-2-2 +

12

1-5-3 +

0-8-5

0-5-3

0-4-3

0-3-5

13

1-6-1

1-0-6

0-7-5

0-5-7 +

0-5-1 +

14

1-7-0

-

0-10-0

0-8-0

0-7-0

Halfbreadths from CL

Waterlines spaced at 2 inch intervals, starting 4" above baseline at WL4

STA

Sheer

WL10

WL8

WL6

WL4

0

0-0-0

-

-

-

-

1

0-7-2

0-5-6

0-4-7 +

0-3-7

0-2-2 +

2

1-1-0

0-11-0 +

0-10-0

0-7-7

0-5-2 +

3

1-5-1 +

1-3-6 +

1-2-5

1-0-2

0-9-0

4

1-8-1 +

1-7-3

1-6-2

1-4-4

1-0-6 +

5

1-10-2 +

1-9-6

1-8-6

1-7-5 +

1-4-5 +

6

1-11-4

1-11-1 +

1-10-3

1-9-5

1-7-4 +

7

2-0-0

1-11-7

1-11-2

1-10-4

1-8-5 +

8

2-0-0

1-11-7

1-11-3

1-10-4

1-8-4

9

1-11-4

1-11-4 +

1-10-7

1-9-6

1-7-1 +

10

1-11-0 +

1-10-5 +

1-9-6 +

1-8-3

1-4-5

11

1-10-1

1-9-2 +

1-7-6 +

1-5-5

0-11-7

12

1-8-6

1-7-2

1-4-5

1-1-1

0-3-2

13

1-7-0

1-4-2

1-0-0

0-5-4

-

14

1-5-0

1-1-5

1-6-7 +

-

-

Diagonals

Diag. A 1' 2" up on CL, 1' 6" out on baseline

Diag. B 1' 4" up on CL, 2' out on baseline

Diag. C 1' 6" up on CL, 2' 6" out on baseline

Diag. D 1' 8" up on CL, 3' out on baseline

STA

Diag. A

Diag. B

Diag. C

Diag.D

0

-

-

-

-

1

0-7-1

0-7-4

0-7-5

0-7-7

2

0-11-3

1-0-6

1-1-5

1-1-7

3

1-2-3

1-4-3

1-5-5

1-6-3

4

1-4-2

1-7-0

1-8-6

1-9-5

5

1-5-6

1-9-0

1-11-1

2-0-1

6

1-6-6

1-10-3

2-0-4

2-1-5

7

1-7-5

1-11-2

2-1-3

2-2-2

8

1-7-4

1-11-1

2-1-2

2-2-4

9

1-7-0

1-10-3

2-0-5

2-1-7

10

1-5-6

1-9-1

1-11-4

2-0-7

11

1-4-1

1-7-3

1-9-7

1-11-3

12

1-2-2

1-5-4

1-8-0

1-9-4

13

0-11-6

1-2-7

1-5-3

1-7-2

14

0-9-2

1-0-2

1-2-6

1-4-5


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: 01.01.2006 ., © ., .