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Today in WW II: 30 Aug 1941 German Lorenz SZ40 teleprinter operator sent a 4,000 character message twice, allowing British mathematician Bill Tutte and others at Bletchley Park to decipher the machine's coding mechanism.  More 
30 Aug 1942 Germany formally annexes Luxembourg to the German Reich, triggering a general strike the next day protesting German Army conscription.
30 Aug 1942 Battle of Alam el Halfa, between Rommel's German force and British Commenwealth troops under Montgomery, south of El Alamein, the end of last major Axis offensive of their Western Desert campaign [30 Aug-5 Sep].
30 Aug 1944 Last remnants of German forces retreat across the Seine River, bringing Operation Overlord to a successful conclusion.
Visit the Olive-Drab.com World War II Timeline for day-by-day events 1939-1945! See also WW2 Books.

TH-55A Osage Training Helicopter

The TH-55A Osage training helicopter is a Hughes Model 269 single three-blade rotor, lightweight 2 seat trainer. The Hughes models were later changed to Model 200 (2 seats) and Model 300 (3 seats).

The Hughes Model 269 first flew in October 1956, and the improved Model 269A was introduced in 1960, the basis of the design of the Army TH-55A Osage. The Hughes Model 269A-1 was procured by the Army as the TH-55A Osage, becoming the Army's primary training helicopter in 1965, replacing the Hiller H-23B trainer. About 800 TH-55A Osage trainers were delivered by 1969. It was retired from Army service in 1988 when the UH-1H Huey became the Army's interim trainer until the TH-67 Creek came into service.

One of the most popular helicopters ever built, the TH-55A Osage has been credited for training tens of thousands of U.S. military pilots as well as wide ranging use of the civilian version by TV news, law enforcement and others.

TH-55A Osage Training Helicopter Specifications and Performance

Rotor diameter 25 ft.
Length 23 ft. 2 in.
Height 7 ft. 11 in.
Weight 2,040 lbs. max
Armament None
Engine 180 hp Avco Lycoming HIO-360-B1A
Maximum speed 105 mph
Cruising speed 75 mph
Range 204 mi.
Service ceiling 9,950 ft.

TH-55A Osage Training Helicopter.  Photo:  Courtesy Boeing
TH-55A Osage Training Helicopter. Photo: Courtesy Boeing.