When performing combat missions, the Americans were extremely cautious, fearing the capture of enemy helicopters. So, in early February, Lieutenant Colonel Mitchell and captain Warren flew out to rescue a fighter pilot shot down behind enemy lines 65 km from the front line. However, the “vane” was not able to accomplish the task.
Then the sailors turned to “land” the helicopter. Mitchell went to the “Rochester”. Taking it a doctor and one assistant with a machine gun, he flew to the rear of the Koreans. Seven fighters carrier-based aircraft covered his helicopter while he circled over the crash site of a fighter. After a few laps, the pilots decided to land, especially as neither of the downed pilot or his parachute was nowhere to be seen. Had Mitchell come back with nothing.
New unofficial record for rotorcraft Sikorsky was the operation “Pronto” to transport troops and equipment to the distance of about 90 km. In 5 hours 45 minutes to nine НRS-1 was transported 620 soldiers and 4.5 tons of cargo. Seven of them were flown by pilots-beginners, who has just arrived in Korea.
Each operation to transport troops carefully prepared and thought over. For example, on 19 April, the helicopters were transporting a battalion of South Koreans to a new location, the route lay over the river. Just in case the pilots wearing lifejackets, and the doors of the cargo cabin were left open. On the river at this time were on duty for two amphibious ready in which case proceed to the rescue.
At the end of April in the actions of division came a forced break. Flights on all the S-55 was forbidden to get a new driveshaft tail rotor. Vices of the same part on several machines caused a number of accidents and disasters.
In the summer of 1952 the number НRS-1 at the front has grown exponentially, and now they were armed with not only Marines but also the US army.
In August of the same year, the helicopter squadron НМR-161 was used for the transfer of 114-mm rocket launchers, rocket launchers from one position to another. The fact that when shooting these installations raised huge plumes of dust and smoke than unmasked its position, causing the return fire of the enemy. The use of helicopters for rapid change firing positions gave the Americans a huge advantage. The rotorcraft was able to raise a single unit and up to 22 rockets with fuses. For interaction between calculations and pilots conducted exercises and practice the skills often used in such a tandem in a real fight.
The power plant of the helicopter – R1340 piston engine power 600 HP
Mi-4 – the Soviet equivalent of the helicopter S-55
12 Feb 1953 in helicopters under mysterious circumstances, there have been two disasters. The first victims were the pilot, captain Ragless and mechanic Sergeant Brand. Their car was heading to the aircraft carrier, which was supposed to deliver it to Japan. НRS-1 to the carrier flew and fell into the sea 40 km South of Busan. Neither the wreckage nor the bodies of the crew could not be found. March 25, 10 km from Cinchona there was a similar case – the pilot and two mechanics were missing… Assumed that the reason was a problem in the power plant.
Since the beginning of the war until the conclusion of peace in the summer of 1953 helicopters S-55 made 18 607 sorties, transported 60 046 people and 3,400 tons of cargo. The evacuation of the wounded was considered a secondary task, but, nevertheless, this figure is very significant – just helicopters rescued about 2748. Another important event for the S-55 in the same year became a test of their nuclear explosion during the exercise, “Desert rock V”, which was held in Nevada at the site of the atomic energy Commission of the United States.
The day before the start of the exercise 39 S-55 flew to the area of a polygon on a dirt airfield Yuka. They had to land troops close to the epicenter of the explosion.
Half an hour before the explosion was set to radio silence. A minute before the explosion, the crew sat in the cockpit and started the engines. At exactly 3 a.m. all around lit up with a flash of bright light, in half a minute on the Playground, passed the shock wave. And immediately rose into the air two helicopter reconnaissance that went to the epicenter. Four minutes later, they landed a kilometer away from the mushroom clouds and landed dosimetrists. After measuring levels of radiation, they gave permission to take off the main group. 37 cars headed out from the staging area and landed paratroopers in 1.5 km from the epicenter. In a report to the head of the exercises, Brigadier General bullock said that S-55 and brilliantly distinguished himself in this operation, and confirmed its ability to move troops in the application of enemy nuclear weapons.
The success of the S-55 has led to the fact that a single-rotor scheme Sikorsky seriously pressed, and in consequence almost supplanted all other schemes of helicopters. Moreover, it happened not only in the United States – although attempts to designers in other countries to build similar aircraft ended in failure.
The layout is similar to the S-55, used in OKB M. L. Mil at the creation of the Mi-4 with the only difference that his fuselage did the double hatch for loading self-propelled machinery.
We can say that a wide spread transport helicopter single-rotor design, the S-55 design I. Sikorsky became a powerful stimulus for the development of the helicopter in many countries.