LACROSSE
Project 1,6 - DRAG LOADING ON MODEL TARGSTS ~ J. Petes
The U. S. Naval Oreérance Laboratory participated in Operation EeCOwING
en Shot LACROSSE with a peogect designed to study diag force loading on
rodel targets,
Two and three cozponent force guages eve used with test
odels of cylindrical, parallelepiped, cubical, and spherical shapes,
‘Shot
LACROSSE, approxi:stely 40 KT yield cevice, was det onated at the ground
surface and protuced at the distances of interest, 2,500 feet and 5,200 feet
from ground ucro, essentially clean, Mach shocks with negligible precurgor,
therral, op Cust disturbences,
At these dicvtances, side-on over~prescu)
end dynzie pressurcs of 18,1 psi end 6.1 pst, «nd 4.5 psi end 0.47 psd
respectively, vere i sesied by this rroject,
AV Fes bat Aca cloned o tae t chal ay cds
time histowtles were obtained freoa all ea:es,
ave shapes
ond
plowe Cvaeg Po. s-
Good csgres int was obtained in
explituc:s bauuren siniler g:gcs at acl-tion, thus estab-
Tishing a high confidsnee le,el in the » protuctbility of the gages end
peliability of the data,
The stingless configurations of cubes mounted on
grovnd plenes, and cylinders and paraWelepl, eta cove Pishly
.esults and reasonable drag cosfficient valves,
repreducie
The Cats for thse rolels
cid not vary significantly betveen the high q and lew q regions; () values
Cotatned wore 1,0 for the 4" oxbes, 0,87 for the 6" dianster cylindars, ~ad
1,38 for the 6" x 6" cress-ssction parallelepipsds,
The spherical models mounted on stings did not produce data readily
interpretable.
Drag coefficients at the low q region «ere higher by a factor
of two than the Cp values at the higher q region.
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