Re: [bolger] Width of Birdmouth Staves
Correction. I should have said Vee cutter for a molding head rather
than "dado cutter". A Vee cutter for a router table/shaper would also
work. The author recommends use of dial calipers for measurement for
this small stock.
Vince Chew
than "dado cutter". A Vee cutter for a router table/shaper would also
work. The author recommends use of dial calipers for measurement for
this small stock.
Vince Chew
Yes, the article about oars by Joel Herzel in MAIB (2/15/01) uses the
0.40 for width, and 0.20 for thickness, but adds that strong rowers in
heavier boats might want to increase the thickness. He recommends a "V"
shaped 45° dado head rather than trying to make two cuts on a table saw
in such thin stock. Depth of birdmouth so as to leave slightly more than
a feather edge. His article is very detailed with excellent photos of
every step. It goes into making and attaching the blades and handles,
also. I highly recommend writing to MAIB for a back issue before
starting this project. ($1.00 each)
MAIB
29 Burley St.
Wenham, MA 01984
Vince
0.40 for width, and 0.20 for thickness, but adds that strong rowers in
heavier boats might want to increase the thickness. He recommends a "V"
shaped 45° dado head rather than trying to make two cuts on a table saw
in such thin stock. Depth of birdmouth so as to leave slightly more than
a feather edge. His article is very detailed with excellent photos of
every step. It goes into making and attaching the blades and handles,
also. I highly recommend writing to MAIB for a back issue before
starting this project. ($1.00 each)
MAIB
29 Burley St.
Wenham, MA 01984
Vince
Is there such a list of parameters for oar looms?
Carron
Carron
According to both the WoodenBoat and the recent MAIB articles:
To find the width of each stave:
At the widest point:
Maximum diameter x 0.40 = maximum stave width
At the narrowest point:
Minimum diameter x 0.40 = minimum stave width
Taper each stave (edge opposite the birdmouth) to yield a spar that
conforms to the design specs.
To find the thickness of each stave:
Maximum diameter x 0.20 = thickness
A note on thickness (from the Woodenboat article). The formula above is
for spruce masts on larger yachts. A multiplier of 0.15 is probably
ample for clear Douglas fir, and as little as 0.10 for very small light boats.
FWIW -- I haven't built one -- just relating what is in the article for
those who don't have access to it.
Vince Chew
To find the width of each stave:
At the widest point:
Maximum diameter x 0.40 = maximum stave width
At the narrowest point:
Minimum diameter x 0.40 = minimum stave width
Taper each stave (edge opposite the birdmouth) to yield a spar that
conforms to the design specs.
To find the thickness of each stave:
Maximum diameter x 0.20 = thickness
A note on thickness (from the Woodenboat article). The formula above is
for spruce masts on larger yachts. A multiplier of 0.15 is probably
ample for clear Douglas fir, and as little as 0.10 for very small light boats.
FWIW -- I haven't built one -- just relating what is in the article for
those who don't have access to it.
Vince Chew