28965003.pdf

PROJECT 10073 RECORD CARD 1. DATE _ : 2. LOCATION 12. CONCLUSIONS O Was Balloon 29 February 1956 south Newton, lowa 0 Probably Balloon 3. DATE-TIME GROUP 4. TYPE OF OBSERVATION O Possibly Balloon ; 3 ; ‘ O Was Aireraft HT: | PRA es SD a ESD gL RE er tad} HiGround- Vi sual O Ground-Radar O Probably Aircraft cut___01/0230ZMar © O Air Visual D Air-Intercept Radar QO Possibly Aircraft 5S. PHOTOS 6. SOURCE 0 Was Astronomical 0 Yes O Probably Astronomical & No Civilian. 0 Possibly Astronomical 7. LENGTH OF OBSERVATION 8. NUMBER OF OBJECTS | 9. COURSE Eat pay neste is sas Sean l* , , zeae pauls stent…

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Aeronautical Chart & Information Photo Library number B-163969 A.C, original source of photo unknown (photo taken during Air Show--) _...& low-flying jet, enveloped in an aura of cloud made by the jet itself, can look like a strange object. This condensation phenomenon, called contrail, occurs when areas of low pressure develop on the wing surface; the air cools by expansion in the slowly moving boundary layer in contact with the wing. The depth of the boundary layer and the drop in pressure both increase with increasing air speed, but each depends very closely on the aerodynamic qualities of …

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