American pilot and fire-control equipment salesman (1915-1984) whose sighting of nine objects over the Washington Cascades on 24 June 1947 opened the modern UFO era. Flying his own CallAir from Chehalis toward Yakima, he detoured over the southwest flank of Mount Rainier to search for a US Marine Corps C-46 that had crashed there the previous December, and at about three in the afternoon, at 9,200 feet, saw a chain of objects strung between Rainier and Mount Adams.
What separates Arnold from almost every witness who followed is that he measured something. He timed the objects on the sweep second hand of the eight-day clock on his instrument panel, starting as the first cleared the southern edge of Rainier’s snowfield and stopping as the last passed the crest of Adams: one minute forty-two seconds. He chose the last object deliberately, “to be quite sure”, a conservative convention that made his own answer too small rather than too large. Dividing that interval into the roughly 47 miles between the summits gave him about 1,700 mph; he told the press 1,200.
The weakness is not the clock but the divisor. Nothing in the record measures the distance to the objects, and speed is exactly linear in it, so the same observation yields anything from a few hundred to nearly 1,800 mph depending on an assumption. Arnold offered the one geometric constraint that exists: some of the objects briefly passed behind a jagged sub-peak on Rainier’s flank, which places them beyond it. J. Allen Hynek’s technical analysis argued the objects must have been much closer and subsonic, though it rested on a size figure that was actually the Air Force file’s mistake about a DC-4’s engine span. The case was filed as Project Sign Incident 17 and finally evaluated as a mirage.
Two things entered the language that week and the record shows neither was his. “Flying saucer” appears in no quotation of his: saucer, pie plate and disc are used as shape words from the first sentence ever printed about him, and he gave the motion its own separate similes. From April 1950 onward he complained he had been misquoted, saying he had described the objects as flying “like they take a saucer and throw it across the water”, a phrase that appears in no 1947 source. The other is the size of 45 to 50 feet, the file’s error, which was quoted for decades as his own estimate and used to argue his sighting was impossible; his own figure was about a hundred feet.
He investigated the Maury Island affair for Ray Palmer weeks later, an episode now generally regarded as a hoax and one in which the two Air Force officers he brought in were killed when their B-25 caught fire. He ran unsuccessfully for Lieutenant Governor of Idaho in 1962, largely stopped giving interviews, broke that silence for the thirtieth anniversary in 1977, and died in 1984 having never withdrawn a word. By the end he had concluded the objects were not machines but living things.
Connections
Arnold Sighting 1947 · Project Sign · Project Grudge · J. Allen Hynek · Project Blue Book