Jetrader - March/April 2008 - 27

aviation history Mach 1 – Chuck Yeager standing in front of the X-1 Who’s On First? By Bill Bath Photo courtesy of the United States Air Force O n October 14, 1947, the Bell XS-1 rocket plane was dropped from a B-29 over the Mohave Desert, and with Captain Charles “Chuck” E. Yeager at the controls it exceeded Mach 1. The Air Force Museum Web site said that on the ninth flight of the Air Force test series, he was the first pilot to have exceeded the speed of sound. Around 1998 they revised the statement to read “ exceeded the speed of sound in level flight.” Why the change? It’s a fairly long story; however, it can be summarized to say that in Washington, DC, politics usually trump the facts. Toward the end of WWII, piston-engine-powered combat aircraft were drilling large holes in the ground when pilots executed a terminal-speed dive and the controls froze solid or reversed themselves. The airflow over the wing’s top surface was going trans-sonic and the center of pressure jumped forward to exert tuck-under from the resulting longitudinal instability—pulling back hard on the stick would cause the air flow force on the up commanded elevators to twist the horizontal tail plane in the opposite direc- tion followed frequently by structural failure. When jet aircraft came on the scene, there were a number of accidents, such as the DeHavilland DH108 Swallow th flying wing, and journalists termed the cause “the journ sound barrier.” The first of the three DH108s built was designed thre to test low-speed charac characteristics. After the fatal crash at Mach .9 of the secon DH108, killing Geoffrey de second Havilland, Jr.—the son of the firm’s owner—the third aircraft (VW120) exceed Mach 1 in September 1948. exceeded Piloted by John Cunningham, a WWII night fighter Cunnin ace, it was the first British plane to exceed Mach 1 Bri after the first two Amer Americans on the official record. The Race October 1, 1947, two weeks before the Yeager-piloted w Bell X-1 was dropped from the belly of a B29 at 20,000 fro feet and accelerated to Mach 1.07, the North American M Aviation XP-86 took off from Muroc Air Force Base on its first flight; at 35,000 feet George Welch, the NAA test pilot rolled over into a 40 degree dive and headed int west. He had a plan, and in spite of having to re-cycle several the landing gear sever times before the warning lights were out and the chase plane’s pilot confirmed full retraction and closed gear doors, he pushed the clos throttles to full power. At 405 mph indicated, the airA speed indicator (ASI) stuck, although Welch could feel stu the aircraft accelerating; he increased the dive angle accelerating indicator flicked to 470 mph and when suddenly the indi continued to climb to 520 mph at 25,000 feet (uncor5 rected, that translates to 720 mph true at that altiJetrader 27

Jetrader - March/April 2008

Table of Contents for the Digital Edition of Jetrader - March/April 2008

Jetrader - March/April 2008
Contents
Calendar
A Message from the President
ISTAT’s 25th Annual Conference
Q and A: R. Stephen Hannahs
History on Display
Aircraft Appraisals
From the ISTAT Foundation
Aviation History
Index to Advertisers
Jetrader - March/April 2008 - Jetrader - March/April 2008
Jetrader - March/April 2008 - Cover2
Jetrader - March/April 2008 - 3
Jetrader - March/April 2008 - 4
Jetrader - March/April 2008 - Contents
Jetrader - March/April 2008 - Calendar
Jetrader - March/April 2008 - A Message from the President
Jetrader - March/April 2008 - ISTAT’s 25th Annual Conference
Jetrader - March/April 2008 - 9
Jetrader - March/April 2008 - 10
Jetrader - March/April 2008 - 11
Jetrader - March/April 2008 - Q and A: R. Stephen Hannahs
Jetrader - March/April 2008 - 13
Jetrader - March/April 2008 - 14
Jetrader - March/April 2008 - 15
Jetrader - March/April 2008 - 16
Jetrader - March/April 2008 - 17
Jetrader - March/April 2008 - History on Display
Jetrader - March/April 2008 - 19
Jetrader - March/April 2008 - 20
Jetrader - March/April 2008 - 21
Jetrader - March/April 2008 - Aircraft Appraisals
Jetrader - March/April 2008 - 23
Jetrader - March/April 2008 - 24
Jetrader - March/April 2008 - From the ISTAT Foundation
Jetrader - March/April 2008 - 26
Jetrader - March/April 2008 - Aviation History
Jetrader - March/April 2008 - 28
Jetrader - March/April 2008 - 29
Jetrader - March/April 2008 - Index to Advertisers
Jetrader - March/April 2008 - Cover3
Jetrader - March/April 2008 - Cover4
https://www.nxtbook.com/nxtbooks/naylor/ISTS0113
https://www.nxtbook.com/nxtbooks/naylor/ISTS0612
https://www.nxtbook.com/nxtbooks/naylor/ISTS0512
https://www.nxtbook.com/nxtbooks/naylor/ISTS0412
https://www.nxtbook.com/nxtbooks/naylor/ISTS0312
https://www.nxtbook.com/nxtbooks/naylor/ISTS0212
https://www.nxtbook.com/nxtbooks/naylor/ISTR0011
https://www.nxtbook.com/nxtbooks/naylor/ISTS0112
https://www.nxtbook.com/nxtbooks/naylor/ISTS0611
https://www.nxtbook.com/nxtbooks/naylor/ISTS0511
https://www.nxtbook.com/nxtbooks/naylor/ISTS0411
https://www.nxtbook.com/nxtbooks/naylor/ISTS0311
https://www.nxtbook.com/nxtbooks/naylor/ISTS0211
https://www.nxtbook.com/nxtbooks/naylor/ISTS0111
https://www.nxtbook.com/nxtbooks/naylor/ISTS0610
https://www.nxtbook.com/nxtbooks/naylor/ISTS0510
https://www.nxtbook.com/nxtbooks/naylor/ISTS0410
https://www.nxtbook.com/nxtbooks/naylor/ISTS0310
https://www.nxtbook.com/nxtbooks/naylor/ISTS0210
https://www.nxtbook.com/nxtbooks/naylor/ISTS0110
https://www.nxtbook.com/nxtbooks/naylor/ISTS0609
https://www.nxtbook.com/nxtbooks/naylor/ISTS0509
https://www.nxtbook.com/nxtbooks/naylor/ISTS0409
https://www.nxtbook.com/nxtbooks/naylor/ISTS0309
https://www.nxtbook.com/nxtbooks/naylor/ISTS0209
https://www.nxtbook.com/nxtbooks/naylor/ISTS0109
https://www.nxtbook.com/nxtbooks/naylor/ISTS0608
https://www.nxtbook.com/nxtbooks/naylor/ISTS0508
https://www.nxtbook.com/nxtbooks/naylor/ISTS0408
https://www.nxtbook.com/nxtbooks/naylor/ISTS0308
https://www.nxtbook.com/nxtbooks/naylor/ISTS0208
https://www.nxtbookmedia.com