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The other three Zeros spread out behind him, boxing him in, and continued to gain. Tracers streaked by! It was time to use the newly installed water injection "War Emergency Power" WEP, a temporary boost to the Pratt & Whitney R-2800 engine. The Jap planes stayed with him, scoring some hits on the F4U. He was really trapped at this point, unable to turn because of the Zeros behind, and forced to continue speeding north, while not gaining appreciably. Slowly, he began to pull away, but the WEP started to over-heat the engine. He got out of range and eased back on the throttle a bit, disengaging the WEP.
Kepford had to make his move now! He cut across the path of the port Zero. The Japanese plane dropped to wavetop level, opened fire, and sharply turned, trying to tunr inside Kepford. At which point the Zero's left wing caught a wave top, and the plane cartwheeled across the ocean surface, disintegrated, and sank. The other two Zeros were left behind as Kepford dashed for home, landing on fumes in his fuel tank. He struggled out of his plane, pale and exhausted. His flying suit and shoes were soaked through with sweat. As the tension of the nerve-wracking four hour mission lifted, he shook all over and tears streamed from his eyes.
Имея взлетный вес 20166 фунтов, взлетевший ХР-47N в сопровождении P-47D взял курс на юг. Через 3 часа 44 минуты полета восточнее Eglin Field на самолете сопровождения закончилось топливо. Ему на смену с Eglin Field взлетел ожидавший сигнала другой P-47D, который выполнил с ХР-47N симуляцию воздушного боя в течение двадцати минут. В течение 15 минут этого боя дроссельная заслонка двигателя была в режиме боевой мощности, и пять минут - в положении чрезвычайной боевой мощности (WEP - War Emergency Power)
After a minute or so of this indecision and lack of direction, while we were slipping away from the formation due to lack of power on Number 1 engine, I announced on the intercom, "We'll do it on three engines". Thereupon I turned the Minneapolis Honeywell controller , installed on the B-17 G models utilizing a one wheel master on the pedestal, up into the "war emergency power" range, thereby boosting power on the remaining three engines and enabling us to stay in formation.
There was just one problem, the engines were not supposed to withstand war emergency power for over 20 or 30 minutes and we had at least 2 hours to go to the target. As we climbed higher, I had to continually increase the over-boost on our remaining three engines, climbing from approximately 15,000 to 35,000 feet where we were to turn at the initial point (I.P.).
The Government had specified a particular test regime to qualify an engine at “War
Emergency Power”. This was a rating higher than take-off power and usually
assumed anti-detonation injection. First the engine was run for five hours in five
minute cycles alternating between War Emergency Power and a fast idle. Then it
was run for two and one-half hours at a steady War Emergency Power rating. The
Government thought this was a tough test, but Pratt & Whitney routinely ran its
engines for 100 hours straight at War Emergency Power. The seven and one-half
hours required by the Government was no problem whatsoever.
А.С.Время работы двигателя на предельных режимах (просто – когда все ручки до упора), чем лимитировалось?
Д.А. Всё лимитировалось температурой головок цилиндров – 220оС. Если ты сумел температуру головок не превысить, т.е. двигатель не перегреть, то на «ручках до упора» хоть весь полет проведи, ничего не будет.
У меня было два тяжелейших воздушных боя, которые я провел именно так – газ «до упора», жалюзи максимально открыл, винт максимально облегчил, двумя руками в ручку вцепился и пошёл «кренделя» «выписывать». И, до тех пор, пока из боя не вышел, второй руки с ручки не снял. И нормально, ничего с двигателем не случилось. И не сбили меня в этих боях во многом благодаря тому, что во время боя я не на что в кабине не отвлекался. Один бой, помню минут 10-12-ть, вот так, на «полном газу», «крутились».
Во время полетов на высоте включать форсаж запрещается, т.к. проходное сечение воздушного канала дросселя недостаточно для достижения максимальной мощности
Another P-47D, already waiting at Elgin, took on the N in a mock dogfight that lasted for twenty minutes. The throttle was advanced to military power for 15 minutes of this time, with an additional five minutes in the War Emergency Power (WEP) detent. After these fun and games were concluded the N was turned around and flown back towards Farmingdale.