A propeller does not necessarily correspond to an engine. For example, henkel's He 177 series bombers in World War II were required by the German Air Force Department and the Aviation Technology Bureau to have 60-degree dive bombing capability while maintaining horizontal bombing capability. With four engines driving two propellers, the problem of power plant has been puzzling He 177, which leads to the overweight engine structure and frequent fire. The famous Wright brothers' "Flyer 1" is driven by one engine and two propellers. Figure 95, four engines are used to drive two propellers rotating in opposite directions. If the propeller fan engine used in the An70 can also be regarded as a propeller, two engines drive two propellers in opposite directions to rotate. In the early 1950s, Conville Company of the United States introduced XFY- 1 tailstock VTOL aircraft, and 19541October 2 began its test flight. Although the test flight lasted for more than two years, its power control was unreliable and it lacked maneuverability in vertical flight, so the US Navy cancelled the project in 1956. 1955, the XV-3 propeller vertical take-off and landing aircraft of American Bell Company made its first flight,1958 65438+February, it changed from vertical take-off to horizontal flight for the first time, and smoothly changed from horizontal flight to vertical landing. In addition, X- 100 and X-200 of Curtis Wright Company, VA-3RY of Ryan Company and VZ-5FA of Fairchild Company of the United States also adopted spiral type, but they all gave up because the technology like XFY- 1 was not mature. The red skull in Captain America escaped in a strange-looking "plane", which looks like a three-wing missile. Its prototype is the Triebfugel rotorcraft designed by Fokker Wolff of Germany, and a propeller is driven by three engines at the top of the rotor.
If a helicopter is counted as an "airplane" and its rotor is counted as a propeller, then most single-engine helicopters are driven by one engine with two propellers, one of which is the cross-type twin-rotor helicopter of Kaman Company in the United States and the * * * axis twin-rotor helicopter of Kamov Design Bureau in Russia, with many specific models. As for the upstairs saying "one engine with two propellers arranged in front and back", I have never seen it.
At present, the aircraft with the largest number of engines is the American Apollo UAV, which uses 14 brushless motor to drive a propeller.