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YOU BEEN TECHNICAL PAPERS
FOR... upon its frontal area, is approximately 0.04 CLARK B
^
About 1/2 of the drag of this body results fron
skin friction and 1/2 from pressure drag. One cut your ci
difference between this ideal shape and any
actual automobile body is that the ideal body your produ
is assumed to be suspended in mid-air, while
the automobile is supported by its four wheels
touching the ground. The addition of well- Standards Or
shielded wheels to the ideal body increases its hoice is varie
drag by a factor of about 3 or 4 to 0.15, or per 3rrous metals
haps slightly less. This value is realizable for lark fastener*
all but the most extreme automobile body f products, in
shapes. Modifications to this basic automobile ■y. We add str
shape by windshields and rough undersurfaces while holding c
SOR increase the drag to the value of about 0.45yor accura|e
CITY? A 15( AGITATOR SHAFT SEAL? that is generally realized today. ^kj||ed
gainst the The drag of automobiles is shown in com- ..
rings . . . Used in automatic laundries, this seal is molded parison to that of various ideal shapes, and the* your neare
ve fatigue to final dimensions. No machining of the intricate stributor.
configuration is necessary. 0.14
— Cp
Drag co e fficie n ts MILLDALE.
1
Fineness ratio — l/d
DRAG COEFFICIENTS OF STREAMLINED BODIES
ATIONS? NON-CONTAMINATING SEALS FOR
CORROSIVE-CHEMICAL/ACID USE?
1 container
ve bearing Purebon seals are used in Florida fruit industries,
at 700°F. in power plants and in soap plants where they are SHAPE DRAG SHAPE DRAG
s and seals subject to citrus juices, nitric acid and detergent COEFFICIENT COEFF1CI
png up to slurries. Will not deteriorate. Will not contaminate ' o.O4 ,--- 0.45
even the most delicate of ingestible liquids.
1/ 0.13 0.51
0.20
c
JS: Our family of Purebon carbon-graphite mate-
|these jobs and many more. Check your product
: these outstanding Purebon properties: (1) Self
ing when mated with metals; (2) Lightweight—
[ter than magnesium; (3) Heat resistant — grows
pres soar, all the way up to 55OO°F; (4) Corro DRAG COEFFICIENTS FOR VARIOUS SHAPES
de ted by most chemicals; (5) Thermal-shock factors contributing to this drag are exam
rically conductive; (7) Dimensionally stable—an ined. It is shown that rough estimates of
thermal expansion. automobile-drag coefficients can be made
omplete information, send today for our free kit, from an analysis of the shapes of the vehicles.
The problem of automobile list also is discussed
Vith Carbon.” Pure Carbon Inc., St. Marys, Pa.
from the standpoint of shape, proximity to
ground and boundary-layer development.
Circle Service No. 120 Circle Ser
DESIGN N M R C H 3 1,
