New-York tribune., 1901-03-18
YACHTING.
BRIDGE TRUSS IN THE INDEPENDENCE
Mr.. CROwNINSHTELD'S INVENTION
FOR STRENGTHENING THE
OVERHANGs

Boston. March L CspeciaD.-Mr CrowninshieId
has devised simple. strong and light system OF
oraeing Or the Overhangs OF the Independence
While the frames stiTen the yacht 10 a large ex-
tent they need aids. and they must be braced 10
each other So from the centre line fore and aft
the deck. ,tanchcns viii De placed al every fourth
frame station. extending dagOnaIly ron the deck
10 the bilge. thus bracng the deck 10 the frames.
Then, from the mast station forward TO within a
few feet OF the bow. the rods will run angles
70 each other from longitudinal strip steel TAX
ing the place Of the keelson. 10 the fourth frame
station forward aft OF the point from which they
start up 10 the centre line Of the deck
These tie rods. crossing each other will form with
the diagonal staachions. sleel truss. similar
that Of bridge. which is expected 10 resist every
possible strain against the forward overhanS. Each
tie rod Will be IN TWO places connected with turn
buckle. having right and left hand threads. that
they may be frightened or loosened as required TO
distribute the strain evealy.
When the Independence dips her nose into the
brine the tendency Of the water is TO break the bow
short Off In upward direction just forward Of
the mast. When the bow rises ou- Of watt the
reverse is the case, but IN a lesser degree The
strain of the forestry and jibstays wAcn under
sail also tends 10 pull the bow upward. and the
Y shaped trusses tie rods. will II is said with
stand his strain.
IN the stern the problems ara not complex.
The greatest strains on the after overhang are
due ~ the pulling OF the mansa against the main
sheet. which tends lift the stern away from the
same direction due TO the buoyancy Of the over
hang when pitching in a rough So IN the
after overhang there is only SET OF diagonal
tie rods instead OF two. IN the bow, but they
are thought 10 be enough 70 meet all require
ments.
The interior bracinS will he fitted until the
boat is almost entirely sheathed.
The smoothing down OF the plating into a brill
liant finish viii be started in a few days, and
Il is expected thar the Independence-s hull viii
shine like a watch case. No decision has yet
been reached as 10 the color OF the paint for the
upper body, and II was rumored to-day that the
boat might be black. Mr. Lawson's Dreamer is
painted glossy black and has always been npca
color she viii be the hrst aspIraat for CUP de-
fender honors since the Priscilla. OF issS. that has
nor NOT been painted White. ,,,,, -..,t., ~ al
eiconal coating OF black lead above the water line
has not Yet been determined. although Boston
rs rs sSoG 81 % I'1s 80 5 -S TT1,ie M IL iSS
We're thoroughly rubbed over before the cup races
To those who have doubted whether Mr. Crown
inshield's balance rudder for the Lawson defender
would be strong enough 10 stand the strain Il has
strength and has been adopted FOR warships IN he
$50 9-s 60 f 80 - isrl, a7a az Tsa- long Under
wafer was greatly improved by being provided with
tiviry which a balance rudGer gives 10 vessel in
turning. II has been shown that while a ~arshlp 5
with ber balance r.ider in less than twice her
IN which she turned was 80 feet. while the regu-
lar allowance would ne expected 10 he l64S feet
From this Il is said that The same principle can
hardly fail give the Lawson boat a superiority
quick continued tackng. the craft being able
10 sail right into the next tack with almost una
bated speed
The balance rudder viii be 10 feet long and feet
inches deep IN the blade. about tW0-tlircs of
which will be abafr the post. which Will take the
water al the after end Of the water line. The boat
will be launched with rhs IN place. and. after she
has fully with il she viii be thrown BY
the head 10 have II removed. after which she viii
tried under the older form OF rudder. so that
h=- performance under both Dc compared 4
considerable saving is by the device gained IN
the lessened amount of wetred surface exposed 10
the friction Of The w1teT the old form Qf rucc-r
for this boat having seventy square feet OF such
surface.