Daily Archives: November 27, 2018

27 November 1957

Captain Ray C. Schrecengost with "Cin-Min," McDonnell RF-101C Voodoo 56-0156 (Boeing)
Captain Ray W. Schrecengost with “Cin-Min,” McDonnell RF-101C-40-MC Voodoo 56-0166 (Boeing)
Operation Sun Run #2, McDonnell RF-101C Voodoo 56-164. (Greater St. Louis Air and Space Museum via Ron Downey Aviation Archives)
Operation Sun Run #2, McDonnell RF-101C-40-MC Voodoo 56-164. This airplane was written off in South Carolina, 10 October 1960. (Photograph courtesy of Ron Downey via Aviation Archives)
McDonnell RF-101C-40-MC Voodoo 56-0165, Sun-Run, flown for Operation Sun Run, 27 November 1957. (U.S. Air Force)
McDonnell RF-101C-40-MC Voodoo 56-165, Operation Sun-Run #3. This airplane was shot down over North Vietnam, 5 December 1966. The pilot, Lieutenant Colonel Arthur Leonard Warren, 20th Tactical Reconnaissance Squadron, 432nd Tactical Reconnaissance Wing, safely ejected and was in radio contact for two hours after parachuting to the ground. He reported that he was taking fire, and contact was lost. He was listed as Missing in Action. His remains were recovered 17 September 1986 and were buried at the Arlington National Cemetery. (U.S. Air Force)
Operation Sun Run #4, McDonnell RF-101C Voodoo 56-166, flown by Captain Ray C. Schrecengost, U.S. Air Force. (Greater St. Louis Air and Space Museum via Ron Downey)
Operation Sun Run #4, McDonnell RF-101C-40-MC Voodoo 56-166, flown by Captain Ray C. Schrecengost, U.S. Air Force. This airplane is on display at the National Museum of the United States Air Force.  (Photograph courtesy of Ron Downey via Aviation Archives)
Operation Sun-Run #5
Operation Sun-Run #5, McDonnell RF-101C-40-MC Voodoo 56-167. This airplane was written off 24 July 1964. (Photograph courtesy of Ron Downey via Aviation Archives)

27 November 1957: Four U.S. Air Force pilots of the 363rd Tactical Reconnaissance Wing successfully completed Operation Sun Run by establishing three new transcontinental speed records in a McDonnell RF-101C aircraft. The record-breaking mission showcased the speed and range of the RF-101C, an improved version of the first supersonic photo reconnaissance aircraft, the RF-101A.

“Operation Sun Run called for six RF-101C aircraft — two to fly round-trip from Los Angeles to New York and back again, two for the one-way flight from Los Angeles to New York, and two for backups if problems arose with the four primary aircraft. The undertaking required massive coordination of aircraft crews and radar and weather stations from coast to coast.

“Operation Sun Run participants, L–R: Capt. Ray W. Schrecengost, Capt. Robert J. Kilpatrick, Capt. Donald D. Hawkins, Maj. Stanley R. Sebring (18th TRS commanding officer, Operation Sun Run operations officer), Lt. Col. William H. Nelson (9th AF, Operation Sun Run programs officer), Capt. Robert E. Burkhart, Capt. Robert M. Sweet, Lt. Gustav B. Klatt. (U.S. Air Force)”

Six pilots of the 17th and 18th Tactical Reconnaissance Squadrons of the 363rd Tactical Reconnaissance Wing were chosen for Operation Sun Run. Each prepared for the round-trip flight, since they would not know which flight they were assigned until a few days before the operation. All six pilots had extensive experience in photo reconnaissance aircraft, although the RF-101 was relatively new to Tactical Air Command.

“The success of Operation Sun Run also depended on the performance of the newly available KC-135 Stratotanker, the USAF’s first jet tanker. The KC-135’s speed allowed the RF-101s to refuel at an altitude of 35,000 feet and a speed of Mach 0.8. Crews from Strategic Air Command and Air Force Research and Development Command prepared for the 26 refuelings the Operation Sun Run RF-101Cs would require.

“At 6:59 a.m., 27 November 1957, Capt. Ray Schrecengost took off from Ontario International Airport near Los Angeles on the first RF-101C round-trip flight of Operation Sun Run. Next into the air were Capt. Robert Kilpatrick on his one-way flight and Capt. Donald Hawkins, flying back-up. Capt. Hawkins followed until the first refueling was complete, and then flew to March Air Force Base, Calif. At 7:50 a.m., Capt. Robert Sweet took off on the second round-trip flight. Lt. Gustav Klatt followed, beginning his one-way trip. Their backup, Capt. Robert Burkhart, also flew to March Air Force Base after the first successful refueling.

“All four RF-101C pilots easily surpassed the previous speed records and established new ones. The new Los Angeles to New York record was established by Lt. Klatt, at 3 hours, 7 minutes and 43.63 seconds. Capt. Sweet set the round-trip record, at a time of 6 hours, 46 minutes and 36.21 seconds, and the New York to Los Angeles record, at a time of 3 hours, 36 minutes and 32.33 seconds.”

Fact Sheets: Operation Sun Run, National Museum of the United States Air Force

McDonnell RF-101C-40-MC Voodoo 56-166. (U.S. Air Force)
McDonnell RF-101C-40-MC Voodoo 56-166. (U.S. Air Force)

The McDonnell RF-101C Voodoo was an unarmed reconnaissance variant of the F-101C fighter. It was 69 feet, 4 inches (21.133 meters) long with a wingspan of 39 feet, 8 inches (12.090 meters). The height was 18 feet (5.486 meters). Empty weight for the RF-101C was 26,136 pounds (11,855 kilograms), with a maximum takeoff weight of 51,000 pounds (23,133 kilograms).

The RF-101C was powered by two Pratt & Whitney J57-P-13 turbojet engines. The J57 was a two-spool axial-flow turbojet which had a 16-stage compressor (9 low- and 7 high-pressure stages), and a 3-stage turbine (1 high- and 2 low-pressure stages). The J57-P-13 maximum continuous power rating of 8,700 pounds of thrust (38.70 kilonewtons); military power, 10,200 pounds (45.37 kilonewtons) (30-minute limit); and 15,000 pounds (66.72 kilonewtons) with afterburner (5 minute limit). The -P-13 was 3 feet, 4.3 inches (1.024 meters) in diameter, 17 feet, 7.0 inches (5.359 meters) long, and weighed 5,025 pounds (2,279 kilograms).

The aircraft had a maximum speed of  879 knots (1,012 miles per hour/1,629 kilometers per hour) at 35,000 feet (10,668 meters)—Mach 1.53. The service ceiling was 49,600 feet (15,118 meters). The Voodoo could carry up to three drop tanks, giving a total fuel capacity of 3,150 gallons (11,294 liters) and a maximum range of 1,864 nautical miles (2,145 statute miles/3,452 kilometers).

The RF-101C was unarmed. It carried six cameras in its nose. Two Fairchild KA-1s were aimed downward, with four KA-2s facing forward, down and to each side.

Beginning in 1954, McDonnell Aircraft Corporation built 807 F-101 Voodoos. 166 of these were the RF-101C variant. This was the only F-101 Voodoo variant to be used in combat during the Vietnam War. The RF-101C remained in service with the U.S. Air Force until 1979.

Colonel Ray W. Schrecengost's McDonnell RF-101C-40-MC Voodoo, 56-166, was named Cin-Min for his daughters, Cindy and Mindy. The Voodoo is painted in camouflage as it appeared when assigned to the 45th Tactical Reconnaissance Squadron at Tan Son Nhut AB, South Vietnam. It was one of the first aircraft camouflaged for combat in SEA. It is in the collection of the National Museum of the United States Air Force. (U.S. Air Force)
Colonel Ray W. Schrecengost’s McDonnell RF-101C-40-MC Voodoo, 56-166, was named “Cin-Min” for his daughters, Cindy and Mindy. The Voodoo is painted in camouflage as it appeared when assigned to the 45th Tactical Reconnaissance Squadron at Tan Son Nhut AB, South Vietnam. It was one of the first aircraft camouflaged for combat in Southeast Asia. 56-166 is in the collection of the National Museum of the United States Air Force. (U.S. Air Force)
Schrek's Cin-Min on the Sun Run" by William S. Phillips at the National Museum of the United States Air Force, depicts Colonel Schre 's McDonnell RF-101C Voodoo. (U.S. Air Force)
“Schrek’s Cin-Min on the Sun Run” by William S. Phillips, at the National Museum of the United States Air Force, depicts Colonel Schrecengost’s McDonnell RF-101C Voodoo. (U.S. Air Force)

A McDonnell Aircraft Corporation film about Operations Sun Run and Fire Wall is available on YouTube:

© 2018, Bryan R. Swopes

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27 November 1933

Martin YB-10 (Model 139), 33-140. (U.S. Air Force)

27 November 1933: The United States Army Air Corps accepted the Glenn L. Martin Company’s first service test YB-10 bomber, serial number 33-140. This was the first all-metal monoplane bomber with an internal bomb bay, retractable landing gear, rotating gun turret and enclosed cockpit. It flew faster than pursuit aircraft of the day.

The prototype Martin Model 123 (XB-907) in flight, 1932. (U.S. Air Force)

There had been a single prototype, the Martin Model 123. It was powered by two Wright R-1820-19 engines rated at 600 horsepower, each. This was designated XB-907 by the U.S. Army Air Corps when tested at Wright Field in 1932. Recommendations for modifications were made, and Martin upgraded the prototype to the XB-907A configuration, which was then designated XB-10 by the Air Corps. The Army then ordered 48 production airplanes.

Martin XB-907A (XB-10 33-139). (U.S. Air Force)

The first group of 14 airplanes were designated YB-10. The YB-10 (Martin Model 139) had enclosed canopies for the pilot and top gunner, and a nose turret. The crew consisted of a pilot, radio operator and three gunners.

These airplanes were powered by two air-cooled, supercharged, 1,823.129-cubic-inch-displacement (29.876 liter) Wright Cyclone SGR-1820-F2 (R-1820-25) 9-cylinder radial engines with a compression ratio of 6.4:1, which were rated at 750 horsepower at 1,950 r.p.m. at Sea Level. The engines turned three-bladed Hamilton Standard adjustable-pitch propellers through a 16:11 gear reduction. The R-1820-25 was 3 feet, 11–13/16 inches (1.214 meters) long, 4 feet, 5-¾ inches (1.365 meters) in diameter, and weighed 1,047 pounds (475 kilograms).

Martin YB-10. (U.S. Air Force)
Martin YB-10 at Wright Field, 1933. (U.S. Air Force)
Martin YB-10, left profile. (U.S. Air Force) 060511-F-1234S-008
Martin YB-10, right rear quarter view. (U.S. Air Force)

The bomber could carry two 1,130 pound (513 kilogram) bombs, or five 300 pound (136 kilogram) bombs in its internal bomb bay. Alternatively, a 2,000 pound (907 kilogram) bomb could be carried externally. There were three .30-caliber (7.62 mm) Browning M1919 machine guns for defense.

Martin B-10B in flight. (U.S. Air Force)

The first full scale production version was the B-10B, which was very similar to the service test YB-10s. These airplanes were 44 feet, 9 inches (13.640 meters) long with a wingspan of 70 feet, 6 inches (21.488 meters) and height of 15 feet, 5 inches (4.670 meters). The B-10B had an empty weight of 9,681 pounds (4,391 kilograms).

The engines installed in this variant were Wright Cyclone SGR-1820-F3 (R-1820-33), rated at 700 horsepower at 1,950 r.p.m. at Sea Level. Dimensions, weight and propeller gear reduction for this engine are the same as the R-1820-25, above.

The B-10B had a cruising speed of 193 miles per hour (311 kilometers per hour), and maximum speed of 213 miles per hour (343 kilometers per hour) at 10,000 feet (3,048 meters).

33-140 was converted to a B-10M for towing aerial targets and was assigned to the Tow Target Detachment at March Field, Riverside, California. Piloted by Robert E. Phillips, 33-140 was damaged in a taxiing accident, 8 April  1942.

Martin B-10 (U.S. Air Force)

© 2018, Bryan R. Swopes

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