keel bearers drilled, cut, and shaped
The keel bearers have been drilled cut and shaped, they are made from Afzelia/ Doussie
Janka hardness 8050N
modulus of rupture 122.3MPa
elastic modulus 14.44GPa
crushing strength 74.1 MPa
average dried weight 805Kg/cubic m
shrinkage - radial 2.3% - tangential 3.9% - volumetric 6.3% - T/R ratio 1.7
Rot Resistance Rated as very durable Moderately resistant to termites and marine borers
used for docks, boatbuilding, etc
instead of Oak (I could not source the required good oak)
the best Oak for boats is White Oak, NOT red Oak
Janka hardness 5990N
modulus of rupture 102.3MPa
elastic modulus 12.15GPa
crushing strength 50.8 MPa
average dried weight 755Kg/cubic m
shrinkage - radial 5.6% - tangential 10.5% - volumetric 16.3% - T/R ratio 1.9
Rated as very durable frequently used in boatbuilding and tight cooperage
Why white oak and not red oak?,
Red Oak has a grain structure that looks like little drinking straws and when you put it in water the little straws suck up water, that is why white oak is used for cooperage, if you had barrels made of red oak all the contents would soak the wood and leak out - Also Red oak is commonly used for cabinetry, furniture, interior trim and is rated as non-durable to perishable with poor insect resistance - it is also quite hard to tell which is red oak and which is white oak, you can test by putting it in water and seeing if it sucks up liquid through the grain straws, or use sodium, nitrite solution- google it -
The mast support is made from a really nice piece of Sapele Mahogany
Janka hardness 6060N
modulus of rupture 110.9MPa
elastic modulus 12.35GPa
crushing strength 58.9 MPa
average dried weight 665Kg/cubic m
shrinkage - radial 5.2% - tangential 7.2% - volumetric 12.9% - T/R ratio 1.4
Rot Resistance heartwood ranges from Moderately durable to very durable in regard to decay resistance Moderate insect/borer resistance
used for docks, boatbuilding, etc
the Afzelia for the keel bearers were available in a size that would allow a finished 5cm thick piece so they will have an extra piece laminated onto the to make up the the thickness as specified in the plans, though even at 5cm thick the specs say to me they are more than strong enough
the extra piece laminated to the keel bearer will have a cut out to countersink the nut see the test piece
if you are interested in wood and timber and the specific qualities of wood
- have a look at the website
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