"Arnold estimated their size at about two-thirds that of a DC-4, and he calculated their speed at over 1500 mph by timing their travel between two mountain peaks of known distance." The length of the fuselage of the Canberra is 66 feet long. The length of a Douglass DC-4 is 94 feet long. This equals the two-thirds estimate of Arnold's. The Canberra test flight program began in at least 1947 and the plane was flying at speeds above MACH-2. Washington State, where Arnold had his sighting, was also home to America's nascent nuclear program. Hanford Washington was a major part of the Manhattan Project. The facilities there would have the ability to service the nuclear aircraft.
TIMELINE
09
January 1946
English
Electric received a contract to produce four prototypes, which
received the Society of British Aerospace Companies (SBAC)
designation A.1; work commenced on the construction of these
prototype aircraft in that same year, which were all built on
production jigs.
19 January 1946
Bell X-1 breaks the sound barrier.
1946
Richard
S Leghorn MIT graduate advocates development of high resolution photo
reconnaissance of a potential enemy using high altitude aircraft.
05
March 1946
IRON
CURTAIN SPEECH
May
1946
NEPA
begins
23
February 1947
San
Diego Union article declaring a remotely controlled atomic airplane
was being built.
24
June 1947
Kenneth
Arnold UFO Mt. Rainer flying @ 1700 mph or 2.289060241 Mach. Arnold
believes that the craft was remotely controlled.
08
July 1947
The
first UFO reports for Project SIGN
July
1947
Pentagon
officials were expressing alarm about the flying disk reports
October
1947
In
response to Rolls-Royce's difficulties, English Electric elected to
have the second prototype modified to use the existing Nene engine in
place of the Avon.[6] The implementation of post-war military
cutbacks also served to slow development.
20
September 1948
Ramjets
being tested in Los Angeles breaking the sound barrier.
February
1949
Project
Grudge
13
May 1949
First
Canberra Flight
28
September 1949
“45,000
horsepower is required to drive a 25 ton plane 1500 miles an hour
(MACH 2.27) at 70,000 feet. … The power requirement would jump to
200,000 horsepower at sea level because of greater air resistance.”
U.S.
May Push Efforts to Make Atomic Engine
Los
Angeles Times (1923-Current File); Sep 28, 1949;
ProQuest
Historical Newspapers: Los Angeles Times
pg.
12
16
October 1949
Caltech
scientists on Mount Palomar observe a “flying disk” that sets off their Geiger counter.
21
February 1951
A
British Canberra B.2 flown by Roland Beamont became the first jet to
make a nonstop unrefueled flight across the Atlantic Ocean, arriving
in the United States for USAF evaluation.
22
February 1951
ATOM
PLANE ON WAY TO DRAWING BOARD; FIRST PHASE ENDED: U.S. Announces...
New
York Times (1923-Current file); Feb 23, 1951; ProQuest Historical
Newspapers: The New York Times with Index pg. 1
http://www.ufoevidence.org/cases/case511.htm
https://en.wikipedia.org/wiki/Martin_RB-57D_Canberra
https://en.wikipedia.org/wiki/Douglas_DC-4