Blue Book MAXW-PBB14-51-66 (PDF)

This NICAP-hosted file reproduces USAF Project Blue Book records on a radar and fighter intercept near Bellefontaine, Ohio, on 1 August 1952. Ground radar near Wright-Patterson AFB tracked an object moving at 400 knots. Two F-86s from the 97th Fighter-Interceptor Squadron were sent to intercept it and filmed a silver round object, but the gun camera film was too indistinct. The file includes a completed radar data sheet, a request from the Air Technical Intelligence Center, and a memo about releasing film frames to TRUE magazine. Early analyses ruled out a balloon, but a later conclusion identified the object as an upper air research balloon cluster.

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PROJECT 10073 PLATFORM DATA 64MB

ALTITUDE (feet)	VELOCITY (knots)	DIRECTION (degrees)	ALTITUDE (feet)	VELOCITY (knots)	DIRECTION (degrees)
.0 25,000 2.0
1,000 30,000
2,000 35,000
3,000 40,000
4,000 45,000
5,000 50,000
6,000 55,000
7,000 60,000
8,000 65,000
9,000 70,000
10,000 75,000
12,000 80,000
14,000 85,000
16,000 90,000
18,000 95,000
20,000 100,000

ATIG Test Form 333 (13 Aug 52)