 C00212846
 ??? Document 4 of 25 for FBIS ??'
 DOCK 000056961
 PD-rG R 151430Z FEB 95
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 SERI SERIAL:   BR1502143095
 PASS PASS:     ATTN BBC SD
 COPY TO 40
 COUN COUNTRY: FRANCE
 SUBJ SUBJ:     TAKE 2 OF 2 -- HYPERVELOCITY TEST TECHNIQUES DISCUSSED
 REF      REF:  BR1502142895 PARIS NEWS FROM PROSPACE ENGLISH DEC 94///
 EXPERIMENTAL RESULTS ((SUBHEAD))
 ((FBIS TRANSCRIBED EXCERPT))  ((PASSAGE OMITTED ON DELICACY OF
 EXPERIMENTS)) THE FLATNESS OF EACH INTERMEDIATE LAUNCH PLAYS A VITAL
 ROLE IN ACCELERATING THE LAST STAGE. ANY DIVERGENCE OF THE SHOCK
 WAVE, AT ANY LEVEL, MEANS A CORRESPONDING DECREASE IN ENERGY
 TRANSMITED TO THE' PROJECTILE, WHILE INCREASING THE RISK OF
 FRAGMENTING THE PROJECTILE RIGHT FROM THE BEGINNING. FOR THIS REASON
 THE DIAMETER OF THE PROJECTILE IS LIMITED TO A FRACTION OF THE
 CARTRIDGE DIAMETER (LESS THAN 25 PERCENT, BUT VARIABLE DEPENDING ON
 MATERIAL USED.)
 BY COMBINING A JUDICIOUS CHOICE OF CARTRIDGE SIZE WITH VARIABLE
 PROJECTILE THICKNESS AND DIAMETERS, THIS TECHNIQUE OPENS THE WAY TQ pprove
 C00212846
 A VAST RANGE OF SPEEDS AND WEIGHTS.   IT IS ALSO THEORETICALLY EASY
 TO CALCULATE PERFORMANCE.
 A NUMBER OF TEST SHOTS HAVE BEEN FIRED USING COPPER, ALUMINUM
 AND,  MORE RECENTLY,  LIGHTER MATERIALS SUCH AS MAGNESIUM.   THREE
 TYPES OF TEST DIAGNOSTICS ARE GENERALLY USED, PARTICUL.ARLY-FOR SPEED
 MEASUTREDCNT: FLASH X-RAY AND LASER  DOPPLER  INTER::EROMETRY FOR THE
 SINGLE-STAGE AND OCCASIONALLY TWO-STAGE LAUNCHERS, AND CHRONOMETRIC
 SWITCHES FOR TEE THREE-STAGE LAUNCHERS.
 PROMISES AND PROBLEMS  ((SUBHEAD))
 THE BEST  TEST RESULTS OBTAINED TO DATE ARE:
 - 2-STAGE: 9.5KM/S (9 GRAMS OF STEEL)
 - 3-STAGE: 13.8 KM/S  (1.75 GRAMS OF ALUMINUM)
 THE MULTISTAGE LAUNCHER TECHNIQUE IS POTENTIALLY WELL AAPTED TO
 THE STUDY OF SPACE DEBRIS,  SINCE THE PROJECTILES USED ARE
 ORTHOCYLINDERS WITH VARIABLE FORMATS, THAT CAN BE MODELED AND ARE
 VERY GRADUALLY ACCELERATED,  THANKS TO THE MULTISTAGE DESIGN AND THE
 PRESENCE OF AIR LAYERS.
 THE MATERIAL IS HOMOGENEOUS, DOES NOT DEFORM DURING FLIGHT, AND
 THE PROJECTILES REMAIN IN A SOLID STATE.   HOWEVER, FIRING IN A
 VACUUM MAY BE REQUIRED FOR LONG FLIGHTS TO AVOID INADVERTENT
 ROTATION OR BRAKING.
 THIS TECHNIQUE OFFERS A HIGH DEGREE OF FLEXIBILITY IN ACHIEVING
 MASS/SPEED GOALS, BUT PROBLEMS - MAJOR ONES - STILL EXIST,  IN TERMS
 OF PROJECTILE SEPARATION AND LAUNCHER COST.
 UNLIKE THE HY?ERVELOCITY JETS, A LARGE AMOUNT OF MATTER IS
 ACCELERATED ALONG WITH THE PROJECTILE ITSELF.
 AS FOR THE SINGLE-STAGE LAUNCHERS, SEVERAL TECHNIQUES HELP TO
 'ELIMINATE, OR AT LEAST LIMIT, THE "UFOS" - UNDESIRABLE FLYING
 OBJECTS.  ONE IS OF COURSE THE CONICAL FORM OF THE PROJECTILE
 SUPPORT RING THAT CAUSES A SLIGHT DEVIATION IN THE TRAJECTORY OF
 THESE UNDESIRABLE FBAG CNTS.   ANOTHER IS TO INSTALL ALONG THE
 TRAJECTORY INCLINED "FRAGMENT SKIMMERS  WITH HOLES CALIBRATED
 ACCORDING TO THE SIZE OF THE PROJECTILE.  FOR THE MULTISTAGE DESIGN,
 THE WEIGHT OF THE INTERMEDIATE STAGES CAN BE VARIED, THUS TAXING
 MAXIMUM ADVANTAGE OF THE SO-CALLED "BILLIARD BALL" EFFECT: I.E., THE
 COMPLETE HALT OF A STAGE WHEN IT HITS THE NEXT ONE, AND OPTIMIZED
 TRANSFER OF QUANTITATIVE INERTIA.
 ALSO WORTH NOTING IS THE NON-NEGLIGIBLE, AND UNEXPECTED,
 ADVANTAGE OFFERED BY THE ACTIVE INTERMEDIATE MEDIA, WHICH AFTER
 DETONATION ARE TRANSFORMED INTO GASES THAT HAVE NO EFFECT ON THE
 TARGET.  ((PASSAGE OMMITTED ON COST FOR USE IN SPACE DEBRIS TESTING))
 THIS REPORT MAY CONTAIN COPYRIGHTED MATERIAL.  COPYING AND
 DISSEMINATION IS PROHIBITED WITHOUT PERMISSION OF THE COPYRIGHT
 OWNERS.
 (ENDALL) DEC 94             15/1430Z FEEB498
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