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Here is a 50 seconds long trk. Summer, 6 °C, no wind, diving 36000 ft to 25000 ft, War emergency power, sim mode, no externals, full speed , near compresabillity limits but at 25000 ft only 51 " manifold pressure as max value at the end of track. what can i do ? New Track.trk

Yo-Yo thanks for clarifying this !!! Last qestion of mine: does someone achieve the manifold pressure that is mentioned in the Memo Report No. TSCEP5E-1908 ttp://www.wwiiaircraftperformance.org/mustang/p51d-15342.html or is it only me with less indicated manifold pressure for example by or over the second critical altitude. Or may be, i do something not correct in the sim. But at first am happy for your good simulating the P-51 Power

its the altitude at which the blower isn´t any longer able to hold the nominal manifold pressure at which the engine is rated, that means above the critical altitude the manifold pressure ist steadily decreasing an so the engine output. so you say: we have an critical altitude 2. stage blower on, normal speed, for the p51 of 26000 ft and 61 in hg (which i think is correct with ram) But the simulation doesn´t reproduce it. i only can achieve about 50 in HG. ?!

what so ever at the moment no one is able to gain even this low value the achievable values in this simulation are in my opinion those without ram air effect. Those values can be read in the original flight manual you presented by the link http://aviationshoppe.com/manuals/v-1650_engine_packard/merlin.html but these values are values from the engine without thinking of a plane and a congruent speed in the air .

At the moment i am not able to fly the p51 at 28000 ft with high speed (that means using ram air effect) and achieving a manifold pressure of anything over or near by 60 in hg. (manual says 67 in hg in war emergency power) i dont think you can. So what have i misunderstand ?

Dear sirs, I think at the moment the merlin engine power cannot make use of the ram air effect of typical aircraft speed. So the engine power at altitude only represents the power value of the turbocharged engine without any ram air effect. So the p51 has not enough power alt altitude e.g. at 30000 feet. I think its a broken link to a not functioning ram air control lever. I hope you can fix it in the future.