Este documento es una 'hagiografía' a la estadounidense, pero entremezclados van párrafos técnicos que valen un potosí sobre como se apretaban (pero apretados de verdad) los motores de pistón justo antes de la llegada del reactor.
Para los muy cafeteros:
http://www.enginehistory.org/Frank%20Walker1.pdf
Frank read a German report on a captured R-2800 that had been test run, torn down, and meticulously analyzed. Allied spies, operating under deep cover in Germany, had somehow managed to get the report and smuggle it out.
German engineers tried water injection (Wassereinspritzung) on their gasoline engines, but with limited success. Germans, who were very good at building highprecision pumps, had perfected direct fuel injection for their large aircraft engines. German engineers injected water directly into the cylinders as well. Since the water did not have time to evaporate and cool the induction air, the large cylinder inlet temperature reduction was not achieved. Frank learned of this while reviewing a report on a captured German aircraft engine.
One interesting test that Frank ran in conjunction with water injection development was called a “drowning test”. Here, the amount of water was increased beyond what was required to suppress detonation. Eventually the amount of water was increased to the point that water was pouring out about half the cylinders, but the engine was still running. Finally, when power had dropped to about 600 HP the test was terminated. There were no ill effects to the engine.
Frank was tempted to try for 4000 HP on the R-2800, but finally decided against it. He did not have a good feeling about pushing the engine past 3800 HP.
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