Tag Archives: Interstate Aircraft and Engineering Company

10 April 1972

Windover’s Interstate Cadet S-1A, with Pikes Peak in the background. Inset: Lieutenant-Colonel W. Roy Windover, RCAF, in the cockpit of his Interstate Cadet. (UPI)
LCol W. Roy Windover RCAF

10 April 1972: Lieutenant-Colonel W. Roy Windover, Royal Canadian Air Force, a pilot assigned to the North American Air Defense Command (NORAD), set a Fédération Aéronautique Internationale (FAI) World Record for Altitude when he flew a 1941 Interstate Cadet S-1A, N37239, to an altitude of 9,388 meters (30,801 feet) ¹ over Pikes Peak, a 14,115 foot (4,320 meter) mountain in the Front Range of the Rocky Mountains, near Colorado Springs, Colorado.

For this achievement, the FAI awarded him its Médaille Louis Blériot.

Lieutenant-Colonel Windover had previously set a Canadian national record by flying a Cessna 140 to 27,050 feet (8,245 meters).

William Roy Windover was born 26 November 1924 at Belleville, Ontario, Canada. He was the son of William Everette Windover and Ella May Charlton Windover.

Pikes Peak, 14,115.19 feet (4,302.31 meters), west of Colorado Springs, Colorado.

Roy Windover learned to fly in 1941. He joined the Royal Canadian Air Force in 1943. He was “seconded” to the Royal Navy and Royal Canadian Navy.

Windover married Genevia Topelko, 10 Feb 1945. They would have three children, Jo-Anne, Roy and Rodderick. They later divorced. Mrs. Windover died in 2005.

In 1958, Flight Lieutenant Windover had been the first Royal Canadian Air Force Red Knight, a solo aerobatics demonstration performer, flying a bright red Canadair CT-133 Silver Star.

In 1974–1974, Windover served at National Defense Headquarters, Ottawa.

On 26 April 1983, Lieutenant-Colonel Windover married Cecile Rose Bruyere.

Lieutenant-Colonel William Roy Windover, Royal Canadian Air Force, Retired, died in an automobile accident, 29 May 1990 at the age of 65 years. He was buried at the Beechwood National Cemetery, Carleton, Ontario.

Roy Windover’s Red Knight CT-133 Silver Star, 21057.

Windover’s Interstate Cadet S-1A, serial number 82, was built by the Interstate Aircraft and Engineering Company, El Segundo, California, in 1941. The airplane was assigned an Airworthiness Certificate on 18 December 1958 and registered N37239.

The Cadet was a single-engine, high-wing monoplane with a tandem cockpit and fixed landing gear. The fuselage of the Cadet was built of a tubular steel framework. The wings had two spruce spars with Alclad metal ribs. The leading edges were covered in Dural sheet and the complete wing then covered in doped fabric. The wing support struts were made of tubular steel. The S-1A was 24 feet, 0 inches (7.315 meters) long with a wingspan of 35 feet, 6 inches (10.820 meters) and height of 7 feet, 3 inches (2.210 meters). The airplane had an empty weight of 720 pounds (327 kilograms) and maximum weight of 1,200 pounds (544 kilograms).

Interstate Cadet S-1A NC34939, the same type airplane flown W. Roy Windover to set a World Record for Altitude 10 April 1972.

The Interstate Cadet S-1A was powered by an air-cooled, normally-aspirated 171.002-cubic-inch-displacement (2.802 liter) Continental A65-8 horizontally-opposed four cylinder direct-drive engine, with a compression ratio of 6.3:1. It was rated at 65 horsepower at 2,300 r.p.m. at Sea Level, using 73-octane gasoline. The engine turned a two-bladed fixed-pitch wooden propeller with a diameter of 6 feet, 4 inches (1.930 meters).

At the time N37239 set this record, it was powered by an air-cooled, normally-aspirated, 171.002-cubic-inch-displacement (2.802 liter) Continental A75 horizontally-opposed four-cylinder engine with a compression ratio of 6.3:1, rated at 75 horsepower at 2,600–2,650 r.p.m. (depending on variant) at Sea Level. The A75 also required a minimum grade of 73-octane aviation gasoline.

The Cadet S-1A had a maximum speed of 103 miles per hour (166 kilometers per hour) in level flight, and 139 miles per hour (224 kilometers per hour) in a dive. The service ceiling was 14,500 feet (4,420 meters). The S-1A’s fuel capacity was 15 gallons (57 liters). Its maximum range was approximately 350 miles (563 kilometers).

Approximately 320 Cadets were built by Interstate during 1941–1942. In 1942 and 1943, another 259 were built as OX-63, L-6 and L-8 Grasshopper light observation airplanes.

N37239 caught fire during a training flight near Amarillo, Texas, 12 January 1995. After an emergency landing, the airplane was destroyed by the fire. The cause was not determined. The airplane was rebuilt and issued an Airworthiness Certificate 8 April 1999. It is currently registered in Farmington, Missouri.²

¹ FAI Record File Number 1918

² FAA registration cancelled 12 March 2018.

© 2019, Bryan R. Swopes

7 December 1941

Cornelia Clark Fort, with a Fairchild PT-19A Cornell trainer. (U.S. Air Force)
Cornelia Clark Fort, with a Fairchild PT-19A Cornell trainer. (U.S. Air Force)

7 December 1941: Cornelia Clark Fort was an instructor in the Civilian Pilot Training Program at John Rodgers Airport, near Honolulu on the island of Oahu, Territory of Hawaii. Early on this Sunday morning, she and a student, a Mr. Suomala, were practicing touch-and-goes at John Rodgers Airport in an Interstate Cadet, NC37345, a two-place light airplane owned by the local flying club.¹

Shortly before 8:00 a.m., Miss Fort saw a silver military-type airplane approaching her Cadet at high speed. She took over the flight controls from Mr. Suomala and put the trainer into a steep climb. The other airplane flew directly under, close enough that she felt the vibrations of its engine. She saw that its wings carried the “rising sun” insignia of the Empire of Japan.

Fort landed the Cadet at John Rogers Airport, which was being attacked by Japanese airplanes. Another trainer on the ground was destroyed by machine gunfire and its instructor killed.

A page from Cornelia Fort’s pilot logbook with her remarks for December 7, 1941. (Texas Women’s University)
A page from Cornelia Fort’s pilot logbook with her remarks for December 7, 1941. (Texas Women’s University)

Fort’s logbook entry for 7 December 1941 reads: “Cadet, 37345, Cont. 65—Flight interrupted by Japanese attack on Pearl Harbor. An enemy airplane shot at my airplane and missed and proceeded to strafe John Rodgers, a civilian airport. Another airplane machine-gunned the ground in front of me as I taxied back to the hangar.” The logbook shows her total accumulated flight time at the end of this flight as 893 hours, 25 minutes.

Cornelia Clark Fort. (Tennessee State Library and Archives)
Cornelia Clark Fort. (Tennessee State Library and Archives)

Cornelia Clark Fort was born into an affluent family in Nashville, Tennessee, 5 February 1919, the fourth of five children of Dr. Rufus Elijah Fort and Louise Clark Fort. Her father was a prominent surgeon who co-founded the National Life and Accident Insurance Company. The family lived at Fortland, an estate east of Nashville.

Cornelia Clark Fort. (1936 Milestones)

Cornelia attended the Ward-Belmont School in Nashville, then studied at the Ogontz School in Philadelphia. (Amelia Earhart had also attended Ogontz.) In 1937, Miss Fort transferred to Sarah Lawrence College, Yonkers, New York, where she studied Literature. She graduated 10 June 1939.

After taking a flight with a friend, Jack Caldwell, in January 1940, she pursued an interest in aviation, starting flight lessons the following day. She had earned her pilot certificate and flight instructor certificate by June 1940, which made her the first woman to become an instructor at Nashville. With the Civilian Pilot Training Program, she first went to Fort Collins, Colorado, where she taught for about three months, then went on to Honolulu.

Pilots of the Women's Auxiliary Ferrying Squadron at Long Beach Army Airfield, 1943. Left to right, Barbara Towne, Cornelia Clark Fort, Evelyn Sharp, Barbara Erickson and bernice Batten. The airplane is a Vultee BT-13 Valiant. (Texas Women's University)
Pilots of the Women’s Auxiliary Ferrying Squadron at Long Beach Army Airfield, 7 March 1943. Left to right, Barbara Towne, Cornelia Clark Fort, Evelyn Sharp, Barbara Erickson and Bernice Batten. The airplane is a Vultee BT-13 Valiant. (Texas Women’s University)

Following the attack on Pearl Harbor, all civilian aircraft were grounded. Cornelia Fort was able to return to the mainland United States in early 1942. In September she was one of the first 25 women accepted into the Women’s Auxiliary Ferrying Service. She was assigned to the 6th Ferrying Group based at Long Beach, California.

Cornelia Clark Fort’s military identification card. (Nashville Public Library)

On 21 March 1943, while ferrying a new Vultee BT-13A Valiant basic trainer, serial number 42-42432, from the factory at Downey, California, to an airfield in Texas, her left wing was struck from behind by another airplane. With its wing damaged, the BT-13 rolled over and entered an inverted dive. It crashed approximately 10 miles (16 kilometers) south of Merkel, Texas, and Cornelia Fort was killed.

Cornelia Clark Fort was the first female pilot killed while on active military duty. She was 24 years old.

Air & Space/Smithsonian quoted from a letter written by Fort in a January 2012 article:

“I dearly loved the airports, little and big. I loved the sky and the airplanes, and yet, best of all I loved the flying. . . I was happiest in the sky at dawn when the quietness of the air was like a caress, when the noon sun beat down, and at dusk when the sky was drenched with the fading light.”

—Cornelia Clark Fort, 1942.

Interstate Cadet S-1A NC34939, s/n 34, the same type airplane flown by Cornelia Fort on 7 December 1941.

The trainer flown by Cornelia Fort and her student on the morning of 7 December 1941 was a Cadet S-1A, serial number 188, built by the Interstate Aircraft and Engineering Company, El Segundo, California. It was a high-wing monoplane with a tandem cockpit. The fuselage of the Cadet was built of a welded tubular steel framework. The wings had two spruce spars with Alclad metal ribs. The leading edges were covered in Dural sheet and the complete wing then covered in doped fabric. The wing support struts were made of tubular steel. The S-1A was 24 feet, 0 inches (7.315 meters) long with a wingspan of 35 feet, 6 inches (10.820 meters) and height of 7 feet, 3 inches (2.210 meters). The airplane had an empty weight of 720 pounds (327 kilograms) and maximum weight of 1,200 pounds (544 kilograms).

The Interstate Cadet S-1A was powered by an air-cooled, normally-aspirated 171.002-cubic-inch-displacement (2.802 liter) Continental A65-8 horizontally-opposed four cylinder direct-drive engine, with a compression ratio of 6.3:1. It was rated at 65 horsepower at 2,300 r.p.m. at Sea Level, using 73-octane gasoline. The engine turned a two-bladed fixed-pitch wooden propeller with a diameter of 6 feet, 4 inches (1.930 meters).

The Cadet S-1A had a maximum speed of 103 miles per hour (166 kilometers per hour) in level flight, and 139 miles per hour (224 kilometers per hour) in a dive. The service ceiling was 14,500 feet (4,420 meters). The S-1A’s fuel capacity was 15 gallons (57 liters). Its maximum range was approximately 350 miles (563 kilometers).

Approximately 320 Cadets were built by Interstate in 1941–1942. They were sold for $2,095. With the onset of World War II, Interstate switched production to the L-6 Grasshopper.

The fuselage frame, c/n 188, is owned by a retired airline pilot, Kent Pietsch, who owns and has restored four other Cadets.

Interstate Cadet S-1A
Interstate Cadet S-1A NC37266, flown by Greg Anders. (Wikipedia)

¹ Greg Anders, Director of The Heritage Flight Museum, Burlington, Washington, owns an Interstate Cadet that he believes was the one flown by Cornelia Fort on 7 December 1941. It carried the registration number NC37266. In an article in Air & Space Magazine, November 2016, he stated that he believes that Fort’s logbook is actually a copy, and that Fort incorrectly listed NC37345.

© 2018, Bryan R. Swopes