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. - 2- Results similar to this