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View Diary: George Lucas "Red Tails" gives Tuskegee Airmen the Rocking War Movie they Deserve (225 comments)

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  •  technically the trim tab is called (0+ / 0-)

    part of the airframe, nevertheless the trim tab is a control surface. And photgraphs show the trim tab falling off...

    Technicaly UR right, but in all practicality, no.

    SO again were not talking about a historical restoration, so there is no concern about keeping airframe content above the 90% mark.....

    So replacing fatigued parts is SOP in any racing aircraft.

    You might look into the orginal dive studys conducted on the P-51 and other planes like the Hellcat and Lightning, they saw severe damage on trim tabs and rear elevators. The Mustang was allowed to mach .83 in a dive, the same as the ME262. US studies found the Mustang was unrecoverable at mach .86.

    Many of these compression studies resulted in reinforcement of the frame parts and the control surfaces mounted in those frame sections at the rear of the plane. Airpower mag had a neat article about the test pilot work at Gruman prewar. These represent some of the fisrt US work on compressability during dives in the US, circa 1940-1941.

    TO suggest that these parts were old because the plane was old and thus subject to fatigue is inane.

    In general terms racing Mustangs undergo these upgrades: The mounts for the Merlin get replaced and I would assume that none of the control surfaces were original in fact all control systems (cables, brackets etc)get replaced as needed, and in fact the wing roots are generally replaced in  P-51 racers. P-51 wing shedding was well documented by 1944.

    The rear of the X-51 was lengthened between the cockpit and rudder by  Irving Ashkenas who also installed the first laminar flow wing on the Mustang and also developed the first functional ventral air intake on the Mustang.

    FDR 9-23-33, "If we cannot do this one way, we will do it another way. But do it we will.

    by Roger Fox on Fri Jan 20, 2012 at 11:09:31 AM PST

    [ Parent ]

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