New Boeing Stratoliners has Successful Test. - The only two of her 11000 horsepower engines Turning Over, The new Boeing Stratoliner was put through a successful test at Boeing field on January 21. The Huge ship carried a maximum capacity load of 45,000 pounds and climbed to well over 10, 000 feet. The ship is designed to cruise at 245 miles per hour. January 23, 1939. (Photo by Wide World Photo).