Tag Archives: wingtip

Oooooh, she’s bendy!

8 Oct

Boeing 787 during a stress test. There’s ~25 ft of deflection at the wingtips.

That’s some seriously badass engineering.

Larger version here:

http://i95.photobucket.com/albums/l128/stroked71/787_25fttipdeflection.jpg

Wing ultimate load test complete on 787
Posted by Guy Norris at 3/29/2010 2:27 AM CDT

Boeing completed the ultimate limit-load test on the static test 787 airframe, ZY997, at Everett on March 28. The test – officially dubbed Condition 18b – evaluates the ability of the wing-body structure to sustain loads equal to 150% design limit load – or the most extreme forces ever expected to be seen in service, and its clearance marks the passing of a significant hurdle on the way to FAA certification.

During the test, which occurred with 14.9 psi fuselage pressure, the wingtips deflected upwards by approximately 25 ft. The test, which did not continue until the wings failed, was also a key evaluation of the strengthened side-of-body modification which in June last year caused a six-month delay to the start of 787 flight tests. The deflection of the higher-aspect ratio composite wing was greater than that of the metallic 777 wing, the last major primary structure to undergo “wing ultimate up-bending” tests in Boeing’s sprawling Everett site more than 15 years ago. The 777 wing failed at 154%, having deflected 24 ft.

Internally Boeing is hailing the test as a major success, though externally the company is sounding a note of caution. “The initial results of the ultimate-load test are positive. More extensive analysis and review are required before the test can be deemed a success,” says Boeing.

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WWII pics – Spitfire uses wingtip to topple V-1 ‘Buzzbomb’

8 Aug

The MK XIV was also one of the few aircraft able to catch and destroy the V1 flying bomb. The Spitfires could sometimes “tip-up” the wing of a V1 by flying alongside and putting their wing under that of the flying-bomb, causing it to tumble out of control

For the lazy:
The V-1 was a pulse-jet powered guided missile developed by the Germans. After losing the Battle of Britain it was realized that the best way to attack British cities by air was to lob stuff like this at them.

At its peak, over a hundred V-1s a day were fired at southeast England, 9,521 in total, decreasing in number as sites were overrun until October 1944, when the last V-1 site in range of Britain was overrun by Allied forces. This caused the remaining V-1s to be re-targeted on the port of Antwerp and other targets in Belgium, with 2,448 V-1s being launched. The attacks stopped when the last site was overrun on 29 March 1945. In total, the V-1 attacks caused 22,892 casualties (almost entirely civilians).

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