In the 1950s, a slightly ugly Kaman HH-43 was in service with the American ** team, and until the 1970s, it also participated in the fighting in Vietnam, and it was a tested model.
The United States has already achieved good results in helicopters during World War II, but the technology of the Kaman HH-43 does not come from the United States, but more from Germany. After World War II, the American paperclip program attracted many engineers who had served in Germany during World War II, such as an aircraft engineer named Anton Fletner, who was the main designer of the German World War II-era "Hummingbird" aircraft.
During the development of the HH-43, Anton Flettner integrated some of the "hummingbird" technology, the most notable feature of which is the use of a pair of rotating twin rotors, the power source is Pratt & Whitney R-1340-48,447KW piston machine, and the deceleration device on the upper part of the engine drives the two thrusters, which can prevent the aircraft from rotating and do not rely on the tail rotor to maintain balance.
The rear of this *** is an elongated tail with four huge vertical fins behind it, as well as a "chimney" that extends to the stern, which is the exhaust port of the engine.
The Kaman HH-43 is a medium and medium model, its performance is good, its total weight is 2096 kg, the maximum take-off mass is 4150 kg, the maximum load is 1800 kg, the maximum flight speed is 190 km, the cruising is 180 km, and the maximum ceiling is 7000 meters.
Once in service, the aircraft will be used for firefighting and rescue missions close to the airport. In the mid-1950s, an attempt was made to replace the airliner with a gas turbine, and later the HH-43B received a Lycoming T53-L-1B turboshaft engine, which had a capacity of 641,000 kilowatts.
Despite its unsightly appearance, in the early sixties the aircraft set four records, one of which was in the absence of a load and reached 100096 meters in the air.
The Kaman-HH-43 also worked here during the Vietnam War, where he spent most of his time performing air rescues, and he successfully performed many missions due to his superior suspension performance. There is also a **, with a pair of short wings on it, and something like a rocket launcher hung on it, which is probably a new technology that the Americans tested in the Vietnam War, when the Americans already equipped this type of fighter on every helicopter, and the Kaman HH-43 was for self-protection in battle, because their defense was not high.
The Kaman-43 was retired in the seventies, while the United States invested in a large number of new fighters in the sixties and seventies, such as the CH-47, which were mainly multi-purpose, such as the UH-1, which could be used as a transport vehicle or as a replacement.
Kaman HH-43 has been retired, but its structural improvement has not stopped, the K-MAX series launched in the nineties is the use of this pair of rotating propellers, known as a very excellent medium-sized lifting transport aircraft, in the civilian market of various countries have a great application.