Page 16 -

Basic HTML Version

Email your answer to
Want to see how much you know? Want to show everyone else how much you know?
The first three people to submit the correct answer to the following question will win a
Westlawn tee shirt and cap, and will also receive a Know It All certificate. The answer
and winners to be published in the next issue of
The Masthead.
Orca3D User Tip
. . . continued from previous page
the normal is point-
ing) are shaded in
your chosen back-
face color. If any of
your surfaces have
incorrect normal
directions, you can
use the Rhino Flip
command to correct
3) Using the backface coloring, it’s easy to see
that the normal direction on the transom sur-
face is incorrect.
4) The normal direction on the transom surfac
has been corrected with the Flip command.
The aluminum sloop
is under construction at Flakey Bay
Boatbuilders. She has a conven-
tional aluminum mast with a dou-
ble spreader rig with double lowers
and no spreader sweepback.
Flakey Bay Boatbuilders needs you
to confirm that the weld on the
combined intermediate- and cap-
shroud chainplates is sufficiently
strong. The 3/4-inch (19 mm)
thick aluminum chainplate lug is
welded to a 1/4” (6 mm) knee un-
der the deck, as shown in the
drawing. All is of 5086 aluminum.
The intermediate shroud is
3/8” (9.52 mm) 1x19 316
stainless rated at 14,500 lb.
(6580 kg), and the cap shroud cap
shroud is 5/16” dia. (8 mm) 1x19
316 stainless rated at 10,300 lb.
(4640 kg).
Do the chainplate lugs as detailed
allow for sufficient weld to secure
them against the loads from the
two shrouds they support?