Quote:
Originally Posted by Crumpp
No, the engine see density not pressure.
1. Whenever you include temperature, you are really talking about density.
IF the engine is equipped with a density controller. If it has a pressure relief valve, then it is dependent upon density altitude.
If it has an absolute pressure valve or a variable pressure controller then it is subject to density altitude effects.
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Well, you are just avoiding the facts here:
1. The engine we are talking here, Merlin (and the US radials in the USAF handbook), keeps constant manifold pressure up to the critical altitude. There are other manifold pressure/density regulating systems but that's another story.
2. The temperature correction does not change the FTH at the pressure altitude scale in these engines. This means that in the density altitude scale the FTH varies according to temperature difference from the standard conditions while the FTH stays constant at the pressure altitude scale.
3. Read the USAF handbook instead waste our time, it's all there. RTFM
