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Building a Traditional Wooden Boat #7: Stem and Knee - Part 2

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Blog entry by MattD posted 07-31-2009 06:44 AM 10085 reads 1 time favorited 5 comments Add to Favorites Watch
« Part 6: Stem and Knee - Part 1 Part 7 of Building a Traditional Wooden Boat series Part 8: Keel, Keelson, Skeg and Sternpost - Part 1 »

Greetings.. Things are moving along well with the boat construction.

This part in the series is cutting out the stem and knee parts which form the front “backbone” of the boat. To do this, I created templates from 1/8” birch plywood and used those as patterns to cut the actual parts from 2” thick white oak.

To get the shape of the templates, I used the same picking up method as I used when getting the shapes from the drawing to the actual molds in part 2. This involves placing nails (which have had half the heads ground off so they lay flat), on the lofting:

Next, I carefully layed a sheet of plywood over the nails and hammered it down so that the nails stuck into the plywood at the same positions as they were on the lofting. The board is flipped over. Crude yet effective.

Next step is to connect the marks left by the nails using battens to get the curves and straight edges where appropriate.

After the lines are drawn, the templates are cut out on the bandsaw and the edges are trimmed to fit exactly on the lofting.

Now the templates are positioned and traced onto white oak. Just barely fit! Phew!

The final stem and knee pieces were cut on the bandsaw. Sections were planed down to 1.5”. All edges were smoothed with a spokeshave and card scraper to fit the lofting. The top of the stem is left long intentionally to attach it to the strongback. Later, this will be cut to size after planking.

Lessons Learned

I probably should have set up to cut out the keel and keelson before starting on the stem, but no harm done. I’m just going to wait until the keel and keelson are on the molds before cutting out the rabbet in the stem which I had initially planned to do for my next step. I want to be able to do some actual test fitting as I cut out the rabbet and can’t do that yet! Also, halfway through planing the 2” oak down to 1.5”, I realized that I should have resawn it and at least have saved a 3/8” piece of oak. It’s all sawdust from the planer now. Ah well.

Next Step

Cutting out the keel and keelson.

Materials List:

  • 8/4 White Oak 32”x10”, Lakeshore Hardwoods, $40
  • 1/8” Birch Plywood, 2’x4’, Lowes, $7

Project Materials Summary:

  • Plans and Book: $60
  • Lofting Supplies: $47.88
  • Mold Supplies: $36
  • Strongback Lumber: $33
  • Transom Materials: $22
  • Stem and Knee: $47

- Total Project Expenses so far: $245.88

Labor Hours Summary:

  • 5/29/09 – 6/8/09: Lofting – 12 Hours
  • 6/14/09 – 6/20/09: Building Molds: 5 Hours
  • 6/25/09 – 6/27/09: Building Strongback: 7.5 Hours
  • 6/30/09 – 7/13/09: Building Transom: 6 Hours
  • 7/14/09 – 7/20/09: Stem Lofting Detail: 3 Hours
  • 7/22/09 – 7/29/09: Stem and Knee Cutout: 4 Hours

- Total Project Labor Hours so far: 37.5 Hours
- Time since starting project: 63 days (2 months 2 days)

-- Matt - Syracuse, NY



5 comments so far

View patron's profile (online now)

patron

13171 posts in 2089 days


#1 posted 07-31-2009 06:53 AM

great work ,
and tutorial .
you show everything and explain it very well .
when are we planing on launching ?

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View MattD's profile

MattD

149 posts in 2692 days


#2 posted 07-31-2009 07:00 AM

Thanks David. I think I could reasonably launch in spring 2010, maybe with the sail too. That would be ideal, but it’s not really a goal.

-- Matt - Syracuse, NY

View a1Jim's profile (online now)

a1Jim

112888 posts in 2325 days


#3 posted 08-03-2009 04:21 PM

super blog well done

-- http://artisticwoodstudio.com Custom furniture

View Napaman's profile

Napaman

5365 posts in 2825 days


#4 posted 08-10-2009 09:57 PM

very nice…

-- Matt--Proud LJ since 2007

View Splinterman's profile

Splinterman

23057 posts in 2109 days


#5 posted 08-15-2009 12:31 PM

Hey Matt,
You are right…..Keel and Keelson is prefered but it will be ok…...take your time….....looking good.

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