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ACUFO:

ACUFO is my comprehensive catalog of cases of encounters between aircraft and UFOs, whether they are “explained” or “unexplained”.

The ACUFO catalog is made of case files with a case number, summary, quantitative information (date, location, number of witnesses...), classifications, all sources mentioning the case with their references, a discussion of the case in order to evaluate its causes, and a history of the changes made to the file.

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Between Tonopah and Austin, Nevada, USA, on July 4, 1947:

Case number:

ACUFO-1947-07-04-TONOPAHAUSTIN-1

Summary:

US ufologist Jan Aldrich indicated in 1999 that on July 4, 1947, in the afternoon, in Nevada, USA, between Tonopah and Austin, a 150 Voyager Private Plane pilot and passenger saw five circular object brilliantly reflecting sunlight as their aircraft was at 10,000.

The objects were below the plane, and the pilot could not catch the UFOs.

Aldrich indicates he found the sighting report in the newspaper Daily Free Press of Elko, Nevada, USA, for July 7, 1947.

Data:

Temporal data:

Date: July 4, 1947
Time: Afternoon.
Duration: ?
First known report date: July 7, 1947
Reporting delay: 3 days.

Geographical data:

Country: USA
State/Department: Nevada
City or place: Between Tonopah and Austin.

Witnesses data:

Number of alleged witnesses: 2
Number of known witnesses: ?
Number of named witnesses: 0

Ufology data:

Reporting channel: The Press.
Visibility conditions: Day.
UFO observed: Yes.
UFO arrival observed: ?
UFO departure observed: ?
UFO action: ?
Witnesses action: Observed, attempted approach in vain.
Photographs: No.
Sketch(s) by witness(es): No.
Sketch(es) approved by witness(es): No.
Witness(es) feelings: ?
Witnesses interpretation: ?

Classifications:

Sensors: [X] Visual: 2.
[ ] Airborne radar: N/A.
[ ] Directional ground radar:
[ ] Height finder ground radar:
[ ] Photo:
[ ] Film/video:
[ ] EM Effects:
[ ] Failures:
[ ] Damages:
Hynek: DD
Armed / unarmed: Unarmed.
Reliability 1-3: 2
Strangeness 1-3: 2
ACUFO: Possible balloon clsuter.

Sources:

[Ref. jah1:] JAN ALDRICH:

N - 07.04 - Afternoon, USA, Nevada, between Tonopah and Austin.

Private Plane - 150 Voyager - pilot and passenger, 5 circular object brilliantly reflecting sunlight, aircraft at 10,000, UFOs below. Pilot could not catch UFOs. (PJ47, p 75, Elko, NV DAILY FREE PRESS 7 July.)

"N" means this is a new case not in November 1997 ACUFOE Catalogue.

[Ref. lhh1:] LARRY HATCH:

799: 1947/07/04 12:00 1 117:12:00 W 38:47:00 N 3331 NAM USA NVD 6:7
TONOPAH><>AUSTIN,NV:2/Pvt.PLANE:5 BRILL.DISKS >>SW/3000M alt:too fast to catch
Ref#171 ALDRICH, Jan: PROJECT 1947 (research) Page No. 75: IN-FLIGHT

[Ref. dwn1:] DOMINIQUE WEINSTEIN:

French ufologist Dominique Weinstein compiled a catalog of the cases of UFOs observed from aircraft. This case appeared in the February 2001 (6th edition) of his catalog as:

DATE 47.07.04
TIME
COUNTRY USA
PLACE between Tonopah and Austin, Nevada
P
TYPE OF PLANE AND WITNESSES a voyager 150 pilot and passenger
UFO DESCRIPTION five circular objects brilliantly reflecting sunlight
Radar
G
X
E
SOURCES 03/37 440

The sources "03/37 440" are referenced at the end of the catalog as:

Project 1947 Reports, newsclippings and documents (cases from Jan Aldrich and Barry Greenwood)

List of ACUFOE cases prior to 1947, Jan Aldrich, Project 1947

Project 1947: A Preliminary report on the 1947 UFO sightings wave, Jan L. Aldrich, 1997, UFORC

[Ref. gvo1:] GODELIEVE VAN OVERMEIRE:

1947, July 4

USA, between Tonopah and Austin, Nevada

The pilot and passenger of a Voyager 150 observed 5 objects brightly reflecting the sun’s rays (Project ACUFOE, catalogue 1999, Dominique Weinstein)

Aircraft information:

Stinson Voyager.

The Stinson 150 "Voyager" (photo above) was an American light utility aircraft with three seats, designed in 1939 and produced by the Stinson Aircraft Company in Dayton, Ohio.

Its maximum speed was 169 km/h.

Discussion:

Map.

Below: photo by Eileen Ulrich and Charles B. Moore of the launch of Project Mogul "Flight 9" balloon cluster in the evening of July 3, 1947, an unlogged "service flight" according to the US Air Force "The Roswell Report", 1995. In his 1997 book "UFO Crash at Roswell: The Genesis of a Modern Myth, former Mogul project engineer Charles B. Moore revealed that Flight 9 used neoprene (synthetic rubber, white color) balloons.

Mogul Flight 9.

The Mogul balloons were launched from Alamogordo Army Air Field (later Holloman Air Force Base) in southern New Mexico.

In "Stratocat", Project Mogul has these durations for their balloon drifts in the beginning of July 1947: July 2: 8 hours; July 3: 3:15 hours (this was Flight 8, remember Flight 9 was not logged); July 5: 9 hours.

The July 3, 1947 flight number 9 is noted with "no data" as to the drift duration and landing site. This is consistent with the above launch photo on which we see that the balloon cluster had no Rawin radar targets attached to it so that it could not have been followed by radar like other launches. Hence the "no data".

There were apparently no Project Helios balloon launches in July 1947.

Balloon drifts in this period and this area would be between 900 km per day and 2.500 km per day. The distance between Alamogordo and the Tonopah - Austin, Nevada area is about 1200 kilometers. This means that Mogul Flight Number 9 launched on July 3, 1947 in the evening may very well have been at the sighting location on July 4, 1947 in the afternoon, when distance is considered.

Mogul Flight 9 was a balloon "cluster", not a balloon "train". It means it was a group of balloons, close together, as on the photo above, not a string of balloons. If the witnesses had seen a "string" of object, they would likely have said it. They did not.

But Project Mogul balloon trains or clusters launched on July 3 and 4, 1947, would almost certainly have been carried east to northeast by the prevailing upper-level westerlies that dominate summer winds over the southern United States.

This would bring them well away from Arizona then Nevada, away from the area where this sighting occurred:

Map.

However, in 1947, Project Mogul and Project Helios were not the only programs using clusters of balloons in the US. Several organizations launched multiple-balloon assemblies.

The U.S. Weather Bureau, the military, and research institutions occasionally used two or more balloons attached together to increase lift, to carry heavier instrument packages, or to reach higher altitudes.

So a balloon cluster is a possible explanation. But not a proven explanation.

Evaluation:

Possible balloon cluster.

Sources references:

* = Source is available to me.
? = Source I am told about but could not get so far. Help needed.

File history:

Authoring:

Main author: Patrick Gross
Contributors: None
Reviewers: None
Editor: Patrick Gross

Changes history:

Version: Create/changed by: Date: Description:
0.1 Patrick Gross June 9, 2026 Creation, [jah1], [lhh1], [dwn1], [gvo1].
1.0 Patrick Gross June 9, 2026 First published.

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This page was last updated on June 9, 2026.