Project Sign Progress Report, 1948
DOW-UAP-D097 · page 25 of 45
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CONFIDENTIAL Incident No. | Exhaust Trail | Heading | Altitude Ft. | Speed | Effect on Clouds 48a | Very faint exhaust trail the vicinity. when moving. | S/W when it left the vicinity. | Not stated | Left vicinity at very high speed. | Not stated 48b | Greenish mist when descending. | S/W when it left the vicinity. | Not stated | Not stated | Not stated 48c | Not stated | 210 degrees when it left the vicinity. | 15000-20000 | Not stated | Not stated 48d | None | Approximately due west when it left the vicinity. | From 4000 to very high. | Slow | Not stated 49 | Long trail of smoke. | West | Very high | Not stated | Not stated 50 | Not stated | Shoreward | Not stated but said to be quite close. | Slow until over land then higher speed while leaving. | Not stated 51 | Not stated | Not stated | High | Not stated | Not stated 52 | None | Southward | 8000-10000 | Made a P-60 look like it was motionless in the air. | Not stated 52a | Not stated | 120° | 6000 | Approximate-ly 750 mph. | Not stated 53 | Not stated | 120° | 6000 | 285 mph. | Not stated 54 | Not stated | North Sea to Norfolk | 22000 | Equal to or greater than a British Mosquito. | Not stated 55 | Not stated | NNE | 10000 | High velocity, stated to be faster than conventional airplane. | Not stated 56 | Not stated | South East | 2000 ft | 500-600 mph. | Not stated CONFIDENTIAL NND 927545