Sunshine Yacht Tender Model #5: Stongback and Molds Pt. 1

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Blog entry by kharder posted 06-07-2010 07:06 PM 5558 reads 1 time favorited 3 comments Add to Favorites Watch
« Part 4: Lofting Pt. 3 Part 5 of Sunshine Yacht Tender Model series Part 6: Buying the Wood »

Enough with the lofting, on to working with some wood and actually building something.

I cut two 4”x6” pieces of 1/4” plywood for each station mold and matched up the most square cornors to be the bottom and inside edges of bookmatched pairs.

I lined up the edges and clamped the sets so that each pair could be temporarily attached together with screws for shaping. I pre-drilled 1/16” holes so the plywood wouldn’t split and tried to get the screws along the outside edge so they would hold the two pieces together for cutting and sanding.

I traced the outline from the templates onto each side rough cut them out with a coping saw.

I then sanded them down to the finished edge with a bench disk sander. The inside faces which are now identical will be the edge used in shaping the boat. This should make for completely symmetrical molds even if the edge was sanded at an angle.

Next up opening up the pairs and mounting them to aluminum angle bases and putting it all on the strongback, which in this case is a piece of 3/4” plywood used as a mounting base.

Build Costs:
  • Plans – $45.00
  • Lofting – $6.50
  • 24” x 36” x 3/4” plywood – $5.00
  • 24” x 36” x 1/4” plywood – $3.00
  • Screws – $4.00
  • 3’ 1”x1” Aluminum Angle – $6.50

Total Cost = $70.00

Build Hours:
  • Lofting – 16 hours
  • Molds – 10 hours

Total Build Hours = 26 hours

Next Steps
  • finish station molds
  • mount molds to strongback

3 comments so far

View a1Jim's profile


115177 posts in 3001 days

#1 posted 06-07-2010 10:14 PM

Boy this might as well be a foreign language to me. But it’s interesting.

-- Custom furniture

View kharder's profile


19 posts in 2421 days

#2 posted 06-07-2010 10:24 PM

Boats and boat building pretty much do have their own language! I sometimes forget how little sense it might make without a nautical dictionary. Hopefully the pictures will all make a bit more sense as it comes together.

View a1Jim's profile


115177 posts in 3001 days

#3 posted 06-08-2010 01:37 AM

I’ll just keep watching and see what I can learn. Thanks for the blog.

-- Custom furniture

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