14.48

9.72

4.76

Periwinkle - a 17' 1-1/2" x 5' 1-3/4" boat for sail, oars, and small outboard

designed by Ross Lillistone

This design remains the property ofRoss Lillistone.All rights reserved. Purchase of plans fromthe designer authorises the building of one boatto this design.

Periwinkle - Outboard Profile17ft x 5ft

DWL at 387kg/851lbs in fresh water,or 399kg/877lbs in salt water

280

This design remains the property ofRoss Lillistone.All rights reserved. Purchase of plans fromthe designer authorises the building of one boatto this design.

599944

1352

1760

3031

3588

2396

4145

4664

Periwinkle - Inboard Profile17ft x 5ft

Level of Stongback

DWL

DWL at 387kg/851lbs in fresh water,or 399kg/877lbs in salt water

F1 F2 F3 B1 F4 B2 F5 B3 F6

LCB

138

253

224

120

120 236

236

599944

1352

1760

3031

3588

2396

4145

4664

50

610 approximately

524

436

539

534

This line is the topof the strongback

This line butts up againstthe aft face of Frame #6

Outline of two plywood braces whichsupport transom at correct angle and height. Upper/left corner lines up witha line drawn across transom at the level of the second plnk from the sheer (see Transom Drawing)

This design remains the property ofRoss Lillistone.All rights reserved. Purchase of plans fromthe designer authorises the building of one boatto this design.

Periwinkle- Strongback

Strongback set on legs to be about 610mm/2ft above the floor at the upper surface.Width of strongback not critical - I suggest about 610mm/2ft as a minimum. Attachframes, molds, and bulkheads to cross-spalls at the height noted on the drawingsfor each section. Cross-spall dimensions not critical - I use roughly 70mm x 35mmor 2-3/4" x 1-1/2" standard house stud material, or similar - vary to taste and availability.

F6 B3 F5 B2 F4 B1 F3 F2 F1

This design remains the property ofRoss Lillistone.All rights reserved. Purchase of plans fromthe designer authorises the building of one boatto this design.

Periwinkle - Frame 5

50

22

150

100

19

1

1

1

1

2 2

3 3

1. Frame 5 from 12mm/1/2" plywood to the blue lines shown. May be made up from several pieces joined together with butt-straps to save material.2. 38mm x 12mm (1-1/2" x 1/2") cross piece glued to aft face of frame.3. Floor timbers from 19mm/3/4" timber. Glued to for'd face of frame and butted up against centreboard case bed-logs and keelson.4. Limber holes for drainage - 24mm (1") radius or more.

NOTE: Centreboard case (in black) shown for illustration purposes only

Strongback

Cross spall attached to Bulkhead by temporarylegs - ommitted from drawing for clarity.

DWL

755

735

686

552

297

24

79

193

325

488

307307

362

12641

343

393

131

4

Typical Bulkhead or Frame Drawing Layout

114

13

43

128

599

28

260

395

479

533

566

587

604

100

100

100

100

100

100

10063

599

1

1

1

1

2

1. Stem made from 3 laminations of 12mm/1/2" plywood (or 6 laminations of 6mm/1/4" plywood) to finish sided 36mm/1-1/2".Molded dimension approximately 50mm/2", except for base which must be accurately to the dimensions shown at the bottomof the left-hand drawing.2. Outer stem laminated over the outside of the stem and planking after the hull has been completed. Make from 3mm/1/8" strips of timber to finish up about 37mm/1-1/2" molded (fore-and-aft) dimension. Make strips wider than necessary and and mark actual width by tracing either side of planking.3. Black dimensions show the approximate locations of the upper edges of planks. Test actual location by running a battenand using your eye to determine fairness. 4. Blue dimensions indicate approximate bevel line for an inner stem of 36mm/1-7/16" siding (width) and a face width of 21mm/7/8".

50

128

29

175

152

170

219

190

176

156

183

285

208

19

20

21

27

49

106

3

4

36

12

21

700

This design remains the property ofRoss Lillistone.All rights reserved. Purchase of plans fromthe designer authorises the building of one boatto this design.

Periwinkle - Inner and Outer Stem

153

30

139126114102

9282736456494236302520

1500

52

100mm Spacings100

355 337

4811141719202122232323222119

1570

337

403 386

1828

110

12

Periwinkle - Centreboard Case and Skeg

Skeg from two laminations of 12mm/1/2" plywood or good quality hardwood to finish 24mm/1" in thickness.Thickness can be increased to 37mm/1-1/2" for greater strength and increased bearing area on trailer rollersif preferred. I used two laminations of hardwood with a layer of 400gsm/12oz glass cloth in-between to preventsplitting of the natural timber. This would not be required with plywood, but plywood is vulnerable to edge-grain damage.

28

24

12

18

42

12

This design remains the property ofRoss Lillistone.All rights reserved. Purchase of plans fromthe designer authorises the building of one boatto this design.

1

2

22

333

44

5

1. Centreboard Case Sides from 12mm/1/2" Plywood.2. End Posts (Head Ledges) from 42mm x 28mm/1-5/8" x 1-3/32"3. Bed Logs from 48mm x 24mm/1-7/8" x 15/16"4. Cleats from 42mm x 12mm/1-5/8" x 11/16"5. Case Cap from 12mm/1/2" solid timber or ply - slot for handleof centreboard.

This design remains the property ofRoss Lillistone.All rights reserved. Purchase of plans fromthe designer authorises the building of one boatto this design.

599944

1352

3588

2396

4664

Periwinkle17ft x 5ft

DWL

1.33/14

46

49

50

50

48

44

38

Gaff Heel

Gaff Peak

40

46

49

50

48

43

36

3540

590

590

590

590

590

590

3942

657

657

657

657

657

657

Boom Heel

Boom Outhaul End

10.92/117.512.25 sq.m132 sq.ft

Mainsail

Luff 2200mm (86-5/8")Leech 5008mm (197-3/16")Head 3453mm (135-15/16")Foot 3774mm (148-9/16")Peak to Tack 5501mm (216-6/16")

Reefs

Luff 750mm (29-1/2") & 1500mm (59-1/16")Leech 900mm (35-5/8") & 1800mm (70-7/8")

Jib

Luff 2724mm (107-1/4")Leech 2302mm (90-5/8")Foot 1164mm (45-13/16")

Mast is same as main mast in Cat-Ketch rig - see "Masts" sheet.

11

The strongback should be as level as

possible, although minor variations can

be corrected by shimming the molds and

bulkheads during the set up.

It is essential that you have an accurate

centreline from which to work. I

normally run a string-line along the full

length of the strongback, just below the

level of the cross spalls on the molds and

bulkheads

Dimensions shown on page Periwinkle

Strongback of the plans will provide the

critical dimensions required for the

setting up of the strongback. Within the

limitations set by these dimensions, you

can use your own judgment about the

construction of the strongback.

In the case of the molds, I would attach

temporary legs to the structure and

extend them down to the strongback.

When making the bulkheads (i.e. those

sectional shapes which remain in the

boat after construction, unlike the molds,

which are removed after the hull is

planked), I suggest attaching temporary

legs to the bulkheads with a temporary

cross member attached to the legs. Use

your imagination in choosing a system –

all that matters is that the component be

accurately and firmly located above the

strongback.

The final dimension which needs to be

determined is the longitudinal centreline.