COMPUMARINE
Cedar Strip Small Craft Designs
Since 1989
260 Camino Apolena
Rio Rico AZ 85648-1028
Bus: 520-604-6700
Fax: 520-377-2900
Res: 520-281-2901

Email: 
johnc@compumarine.com

Compumarine has moved from
Everett, WA to Rio Rico, AZ!!!


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Congratulations to Bob Hardy
of Hardy Marine, Marathon Florida

12' Foam & Fiberglass Power Dinghy

9/15/03

Hi John
Just wanted to let you know new address hardy26@bellsouth.net should have this one for awhile been working out good for a year. Been enjoying the boat recently towed it on a trip to some islands off Key West got caught in some bad thunderstorms the dink was jumping clear of the water on some waves towed like a charm left the plug out stayed empty even in the storms had a good time once we got there.  Have a good day.
Bob Hardy

2/4/2003

Hi John
Recently finished the boat I built from your plans.   It works great and is pretty.   You should be getting some pictures in a few days.   Any questions should be emailed here 
hardymarine@earthlink.net  Its a new ISP from the one I had when I ordered the plans.  Love the boat!  Planes in a good chop and is dry, sails well, makes 22 miles an hour with a 15 HP Mercury, is self bailing and unsinkable as it is made of foam.   Thanks again.  Have a good day! 
Bob Hardy

2/7/2003

 

 

 

 

 

 

 

 

 

 

 

 

 


This Power Dinghy is built using 1/2" Core Cell Foam & Fiberglass.

See the materials list and Labor Log of Hours at the end of the photos.

In this photo the boat is on a plane at 1/3 throttle with 15 HP Mercury. 

Power Dinghy under Sail using a Lugsail.

Foam Power Dinghy Materials

 
15 gal vinlyester resin 393.00
Cloth from Christan - start Weight = 28 lbs. 3.25lb. Used it all 91.00
4 – sheets core cell foam     4 x 8 x 1/2 456.82
Wood for strongback and molds 75.21
First hardware order – Handles, eyes, etc. 165.03
Carbon paper 3.00
Last sheet CDX for molds       4 Total 14.50
Rub rail  vinyl 113.35
1-sheet 1-in core cell foam for transom & cap rail   125.00 125.00
1-gal classic plastic 15.00
Wood battens for fairing 12.00
Hot glue 3 bags 15.00
Box finish nails 2.00
¾ mat 3lbs 2.00 lb 6.00
1- 4iin roller set 6.00
5qt pails 1.30ea = 2-2-1-1- 7.80
Acetone 8.00 gal. = 1-1-1/2-1/2-1/2- 28.00
8in stick on discs 2.00 ea = 4-2- 2 - 16.00
Gloves start with one box 12.00 12.00
3m dust masks 2.25 ea. = 1-1- 4.50
11/2oz mat 2.00 lb = 10- 8-2 40.00
4in roller cover 2.00 ea. =1 2.00
Roloc discs 1.75 ea = 4-2-1- 12.25
Grinding suits = 7.00 ea. = 1-1-1-1- 28.00
5in discs = 2.00 ea. = 3 – 3-3-2-2 26.00
6in discs stick on .50 ea. = 6-2-3-14-8-4-10-2-5-= 45 22.50
4in brushes –3.75 ea. = 1 3.75
Another ½ sheet core cell foam (left over from job) seat parts 50.00
12in bi ax tape 18oz .85ft =15-8 – 5 –9-4- 34.85
1-gal of polyfill light weight filler 20.00
Start on second box of gloves today 12.00 12.00
1qt of white enamel for inside of lockers 10.00
6in plastic spreaders .60 ea. = 4 – 1-1-1- 4.20
Jig saw blade 3.00ea. = 1 -2 12.00
West epoxy =5qt. kit 75.00
11/4 drain liner and plug and epoxy 8.00
16in file sheets 40grit 2.00 ea = 2 –4-2- 16.00
Plastic hatches 3 100.00
LV 300 epoxy resin 1 qt. 1-1/2qts. 1/2qt. 8.00
4in foam roller covers 1.00 ea. = 2-2-2- 6.00
2-1/2qt pails = 1.25 ea = 4-3-2-1-2-1 –1- 17.50
3in brushes – 1.00 ea = 2-1-1-1 5.00
Microballons 15.00 gal. = 1-1/2-1/2- 30.00
4oz tube 5200 5.00
545 epoxy primer 1-1/2 qts.  30.00 qt. 45.00
Awl grip paint 46.00 qt .mixed product = 1 –1/2 –1/2-green 1-1/2qts. 161.00
Paint strainers .25 ea = 3 - 0.75
Paper and tape = 5.00 5.00
Brass tube for drain & bolt liners 2.00
Bolts for transom handles 3.00
Another gudgeon, tiller fittings, caulk and fasteners 25.00
                                                                                              Total
2351.01
      Date

Hours

                                Work preformed
12/9/2002 2 Build strong back
12/10/2002 3 Start making station molds
12/13/2002 1 Assemble transom mold
12/15/2002 8 Finish molds set up strongback attach molds
12/18/2002 1 Attach stem start on transom glass one side 1 mat
12/19/2002 1 Mount transom sand bevel and fair
12/21/2002 10 Start putting foam on mold its slow going some hot glue & Bondo
12/22/2002 10 All but 3 - 2 in. strips - boat is planked  4 - 3 in. from sheer up 1-23/4 - then 2 in. from the centerline down. worked out good, hot glue in the easy spots, Bondo in the hard to hold areas 2&3/4 - sheets foam with a little left not including the transom its 1 in. ¼ sheet used
12/23/2002 8 Finish putting foam on, sanded and faired the hull, then fiber glassed the whole outside with 1 - 18oz. Stitched woven and a 3/4oz Mat over it about 31 lbs. Of material - 6 gal. of resin
12/24/2002 8 Flipped the hull, removed most of the molds glassed in between, then removed the rest and finished glassing its glassed inside and out.
12/26/2002 9 Make cap, its on the boat shaped and resin coated ready to glass
12/27/2002 8 Glass cap, start making seats and float chamber fwd.
12/28/2002 10 All day on seats bow compartment made mast step, should close it all up tomorrow
12/29/2002 7 Seat tops finished & bow compartment all 95% glassed started on centerboard trunk
12/30/2002 2 Assemble daggerboard trunk, cut hole in boat resin coat mud in
12/31/2002 3 Glass daggerboard trunk, cut down and glass transom, Cut out sand install Glass plates for transom (epoxy)
1/1/2003 6 Work on transom, glass top piece on trunk, cleats for center seat, grind whole inside of boat
1/2/2003 3 Sand filler, install drain liner
1/3/2003 4 Finish sanding, cut all hatch holes, epoxy coat whole boat inside
1/4/2003 7 Flip boat, grind hull, make spray rails & skeg, glass on
1/5/2003 2 Sand spray rails and skeg, epoxy fill whole hull outside
1/6/2003 3 Air file hull not done
1/7/2003 3 Finish sanding, apply over a quart of west and balloons
1/8/2002 3 Sand hull, get ready for resin coat
1/9/2002 1 Epoxy coat hull
1/10/2003                Sea trial boat, put back under shed for painting
1/11/2003 3 Sanded the hull and got the bow eye in ready for primer tomorrow
1/12/2003 3 Sand and prime boat, fill pinholes, sand whole boat 220
1/13/2003 3 Finish sanding boat, spray paint, glass seat (center)
1/14/2003 2 Finish green stripe, flip boat over, sand edges of seat, fit to boat, sand ends of seat brackets
1/15/2003 2.5 Mask hull, Sand cap, start on inside
1/16/2003 3 Sand inside, start on oar socket pads
1/17/2003 3 Install bolt and drain liners, also stern handles, glue oar socket pads
1/18/2003 3 Cut out hull # plate attach, start on raising transom to right height
1/19/2003 6 Finish running wires for lights, glass transom & fill, make stern light mount, start on daggerboard cover and gasket
1/20/2003 3 Finish daggerboard cover, grind & sand transom
1/21/2003 2 Sand seat and rest of inside ready for primer
1/22/2003 1 1/2 Spray first coat of cream awlgrip paint in boat
1/23/2003 3 Second coat of paint and webbing
1/24/2003 9 Put all hardware and hatches on, make rudder, rubrail on
1/25/2003 4 Finish wiring lights, build battery box, then load boat on truck.  Go weigh it.  244 lbs. completed.   Launched it, went for a ride around the island, 17 miles, 15 knots wind, boat is dry, planes at half throttle with 2 adults, engine 15 HP Mercury I am happy with it.
148 Total hours, start to launch  -  Still have rudder and daggerboard to finish

Construction photos start here.







 

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