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Making the Brazilian ATR-72 Spin
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Note: This story was corrected on August 10th at 10:23 am, thanks to the help of a sharp-eyed reader.
Making an ATR-72 Spin
I wasn’t in Brazil on Friday afternoon, but I saw the post on Twitter or X (or whatever you call it) showing a Brazil ATR-72, Voepass Airlines flight 2283, rotating in a spin as it plunged to the ground near Sao Paulo from its 17,000-foot cruising altitude. All 61 people aboard perished in the ensuing crash and fire. A timeline from FlightRadar 24 indicates that the fall only lasted about a minute, so the aircraft was clearly out of control. Industry research shows Loss of Control in Flight (LOCI) continues to be responsible for more fatalities worldwide than any other kind of aircraft accident.
The big question is why the crew lost control of this airplane. The ADS-B data from FlightRadar 24 does offer a couple of possible clues. The ATR’s speed declined during the descent rather than increased, which means the aircraft’s wing was probably stalled. The ATR’s airfoil had exceeded its critical angle of attack and lacked sufficient lift to remain airborne. Add to this the rotation observed, and the only answer is a spin.
Can a Large Airplane Spin?
The simple answer is yes. If you induce rotation to almost any aircraft while the wing is stalled, it can spin, even an aircraft as large as the ATR-72. By the way, the largest of the ATR models, the 600, weighs nearly 51,000 pounds.
Of course, investigators will ask why the ATR’s wing was stalled. It could have been related to a failed engine or ice on the wings or tailplane. (more…)
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How the FAA Let Remote Tower Technology Slip Right Through Its Fingers
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In June 2023, the FAA published a 167-page document outlining the agency’s desire to replace dozens of 40-year-old airport control towers with new environmentally friendly brick-and-mortar structures. These towers are, of course, where hundreds of air traffic controllers ply their trade … ensuring the aircraft within their local airspace are safely separated from each other during landing and takeoff.
The FAA’s report was part of President Biden’s Infrastructure Investment and Jobs Act enacted on November 15, 2021. That bill set aside a whopping $25 billion spread across five years to cover the cost of replacing those aging towers. The agency said it considered a number of alternatives about how to spend that $5 billion each year, rather than on brick and mortar buildings.
One alternative addressed only briefly before rejecting it was a relatively new concept called a Remote Tower, originally created by Saab in Europe in partnership with the Virginia-based VSATSLab Inc. The European technology giant has been successfully running Remote Towers in place of the traditional buildings in Europe for almost 10 years. One of Saab’s more well-known Remote Tower sites is at London City Airport. London also plans to create a virtual backup ATC facility at London Heathrow, the busiest airport in Europe.
A remote tower and its associated technology replace the traditional 60-70 foot glass domed control tower building you might see at your local airport, but it doesn’t eliminate any human air traffic controllers or their roles in keeping aircraft separated.
Inside a Remote Tower Operation
In place of a normal control tower building, the airport erects a small steel tower or even an 8-inch diameter pole perhaps 20-40 feet high, similar to a radio or cell phone tower. Dozens of high-definition cameras are attached to the new Remote Tower’s structure, each aimed at an arrival or departure path, as well as various ramps around the airport.
Using HD cameras, controllers can zoom in on any given point within the camera’s range, say an aircraft on final approach. The only way to accomplish that in a control tower today is if the controller picks up a pair of binoculars. The HD cameras also offer infrared capabilities to allow for better-than-human visuals, especially during bad weather or at night.
The next step in constructing a remote tower is locating the control room where the video feeds will terminate. Instead of the round glass room perched atop a standard control tower, imagine a semi-circular room located at ground level. Inside that room, the walls are lined with 14, 55-inch high-definition video screens hung next to each other with the wider portion of the screen running top to bottom.
After connecting the video feeds, the compression technology manages to consolidate 360 degrees of viewing area into a 220-degree spread across the video screens. That creates essentially the same view of the entire airport that a controller would normally see out the windows of the tower cab without the need to move their head more than 220 degrees. Another Remote Tower benefit is that each aircraft within visual range can be tagged with that aircraft’s tail number, just as it might if the controller were looking at a radar screen. (more…)
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Devotion: Bearcats, Corsairs, & Real Moviemaking Oh My!
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Nothing ruins the enjoyment of a good aviation film more thoroughly than computer-generated images. Real moviemaking, filming real airplanes is what makes movies like “12 O’Clock High” and “Top Gun” so memorable. That’s why I’m eagerly awaiting “Top Gun: Maverick” and a new film that aims at the advanced, HD technology used in Top Gun 2 on F4U Corsairs and an F8F Bearcat in the Korean War story of Jesse Brown and his wingman, Medal of Honor recipient Thomas Hudner.
The film is based on Devotion: An Epic Story of Heroism, Friendship, and Sacrifice, written by Adam Makos (and I’ve just ordered a copy). Ensign Jesse Brown was the Navy’s first African-American fighter pilot, and Lieutenant Junior Grade Thomas Hudner was his friend and section leader in Corsair-equipped Fighter Squadron (VF) 32. Over North Korea, the ground fire brought down Brown on a close-air support mission for the Marines fighting their way out of the Chosin Reservoir on December 4, 1950.
With the ground fire hitting the Corsair’s oil tank, Brown made a forced landing on a snowy mountainside. Smoke wafted from the downed Corsair’s cowling and Brown waved from the cockpit but did not get out of it. Realizing the rescue helo they’d call would not arrive in time, Hudner belly-landed his Corsair near his friend and attempted to free him from the cockpit after he put out the fire with snow. Hudner could not free Brown’s legs, even with the aid of the crew of the helo when it arrived.
With the film’s production team striving to shoot as much of the film as possible “in-camera” (meaning real airplanes in flight), they turned to aerial coordinator Kevin LaRosa Jr., who’s done a lot of air-to-air work in films including “Captain Marvel” and “Top Gun: Maverick.” One of those cameras will be the new 6K digital camera, the Red Komodo. The producers told LaRosa that they wanted what he delivered for Maverick, times 10.
LaRosa has compiled a fleet of 11 aircraft, Corsairs, Bearcats, Skyraiders, and MiGs, all repainted in accurate squadron colors (VF-32 Bearcats and transitioned to Corsairs for Korea). With helicopters and the CineJet, L-39 with a nose-mounted camera, they have been shooting somewhere in Washington. The aerial director of photography is Michael FitzMaurice, who also shot the air-to-air for Maverick.
All I’ve seen are the trailers to Maverick, and the best one is the extended Super Bowl version that offers a tantalizing behind-the-scenes look at its aerial production. So get vaccinated so we can achieve herd immunity and return to theaters so we can finally see these films on the big screen, better yet, the overwhelming IMAX!
If you enjoyed this story, why not SUBSCRIBE to JetWhine, if you haven’t already, and please share it with anyone who might find it interesting. — Scott Spangler, Editor
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B-17 Concrete Ordinance? The Disney Bomb
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YouTube is a good weekend destination when the wind chill is in double digits because it usually inspires a curiosity quest. It started with The Doc Furness War, a 96-minute aggregation of 16-mm color motion pictures taken by the flight surgeon of the 92nd Bomb Group based at Paddington, UK. If you’re curious about life at a World War II B-17 base, this one covers all aspects of life, from passes to London to flying combat missions (with none of the Memphis Belle film you see in so many other productions).
The narrator does an excellent job of expanding the moving images with detailed words. He explained, for example, that the long, pointy cylinders the crews were mounting below the B-17’s wings, one on either side of the bomb bay were “Disney Bombs.” A US Army Air Pictorial Service film said General Doolittle’s men called it the “Disney Swish.” The B-17s dropped the 18-foot bombs on hardened targets like submarine pens and rocket sites.
So what’s the connection to Disney? And is that Mickey Mouse’s Disney? Apparently, the weapon was inspired by the bomb that took out a Nazi sub pen in a propaganda film, Victory Through Air Power, made by Walt Disney.
But wait, the story is even more unexpected. A Royal Navy officer, Captain Edward Terrell, who served in the Royal Naval Volunteer Service with the Directorate of Miscellaneous Weapons Development, imagined the weapon, officially known as the “4500-pound Concrete Piercing/Rocket Assisted” bomb. The solid-fuel rocket boosters gave it the added Swish to penetrate 16 feet of solid concrete. Gravity alone accelerated the Britain’s 10,000-pound Tallboy bomb to 750 mph. The Disney hit at 990 mph.
Built in three sections, the thick armor piercing steel warhead was 11 inches in diameter and filled with 500 pounds of explosive. The center section, 19 inches in diameter, held 19 3-inch rocket motors. The tail section held the necessary electrical circuits and wind-powered generator fan blades. A time delay or barometric sensor ignited the rocket motors, and the bombers had to drop the rocket-accelerated weapons precisely from predetermined altitudes.
In other words, the Disney Bomb rarely hit its intended targets. And this explains why the British bomber command, which usually practiced area bombing at night, never launched a Disney bomb. Believing the Army Air Forces claims of its daylight bombing accuracy, founded on the Norden bombsight, the British joined forces with Doc Furness’ outfit, the 92nd Bombardment Group.
During a March 1945 raid on submarine pens under construction at the port of Farge, not far from Bremen, 30 B-17s launched 60 Disney Bombs. One of them hit the target. Given this success rate, Disney development ended not long after the war. Clearly, all it needed was the GPS guidance system used on today’s Joint Direct Attack Munitions (JDAMs). In 2009, the 8th Air Force scored another hit when the body of a Disney Bomb, and its 500-pound warhead, were extracted from the thick concrete roof of a bunker in Watten, a V-2 launch bunker, now a private museum.
If you enjoyed this story, why not SUBSCRIBE to JetWhine, if you haven’t already, and please share it with anyone who might find it interesting. — Scott Spangler, Editor
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Crowdsourced SciFi Dictionary is Time Travel Gateway
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As a word merchant, dictionaries are my favorite books whether they are online or old school paper, and not because I am a less than stellar speller. The most fascinating are historical dictionaries, like the Oxford English Dictionary (OED), that trace a word’s life from its birth of first usage through its lexical and linguistic maturation. Words cannot describe my joy at discovering the new Historical Dictionary of Science Fiction (HD/SF), because the aerospace endeavors we today take for granted were considered science fiction not that long ago.
Its editor, I learned, is Jesse Sheidlower; he started this ongoing project when he was an editor at large at the OED. No longer formally affiliated with the OED, this work in progress continues to illustrate the core vocabulary of science fiction and related fields. Like the OED, the HD/SF employs crowdsourced research. (For an entertaining and informative explanation of how this process evolved, read The Professor and the Madman by Simon Winchester or watch Mel Gibson and Sean Penn in the title roles in the 2019 film on Netflix.)
As a work in progress (no dictionary is ever finished because our lovely language never stops evolving), the HD/SF is still collecting verifiable evidence in the form of quotations from printed sources. The site also seeks moderators who are dedicated science fiction and detail geeks who will actively edit its content. If this is you, check out How to Help.
Aside from the words that live in the dictionary, what makes it a worthwhile read is the many ways into it. One way is by subject, from Aliens and Dimensions to Propulsion and Weaponry. Or you can look at the list of Most Quoted Authors, starting with Robert A. Heinlein, with 178 quotations. For a quick read, the menu offers New Entries (since site relaunch), today topped by “Afrofuturism n. (1993)” defined as “a movement in literature, music, art, etc., featuring futuristic or science fiction themes which incorporate elements of black history and culture.”
If you like surprises, select the Random Entry menu item. F.M. Allen introduced The Little Green Man as the title of his book, published in 1895, the debut of “a stereotypical inhabitant of our space; a person of peculiar appearance.” Naturally, you can search the dictionary by headword and author. Or you can do what I did this weekend, watch it snow and scroll through the HD/SF’s 35 pages.
Aerocar is the word that hooked me. The image the word brings to mind is Molt Taylor’s post-war flying car, which first flew in 1949. But I learned that Fred C. Smale introduced the word in a story he wrote in 1900 for Harmsworth Magazine, the “Abduction of Alexandra Seine.” And you can read it by clicking the “page image” button, and find the passage. “Bowden Snell was now developing the film in his room at the Flash office, and the aerocar which had brought him was still outside the large bay window swinging gently to and fro at its moorings in the summer breeze.” That sounds like urban air mobility to me.
If I haven’t already, I’ll stop here before I exemplify Sturgeon’s Law. Based on a statement by Theodore Sturgeon in the early 1950s, it wasn’t quoted as a humorous aphorism that maintains that 90 percent of a body of published material or knowledge is worthless, “usually later cited as 90 percent of everything is crap.”
If you enjoyed this story, why not SUBSCRIBE to JetWhine, if you haven’t already, and please share it with anyone who might find it interesting. — Scott Spangler, Editor