blue_six Posted December 31, 2016 Share Posted December 31, 2016 Thanks for all your work on this Friedrich-4/B, my curiousity is well satisfied. To celebrate, I repeated my earlier trial in the Free Flight IA mission, this time leaving the boost pump ON. No problems at all, clawed my way up to 41,000 w/o a hiccup, even w/o switching on the fuel tank pressurization. The DCS Flight Manual and Quick Start guide could each benefit from some attention in this area. The fuel system description makes no mention of the electric boost pump at all, nor does it appear in the various checklists for start-up, warm-up, climb and landing. It's ON by default in all the IA missions which begin with the engine already running, so clearly someone appreciates its importance. Link to comment Share on other sites More sharing options...
Winchester Posted January 1, 2017 Share Posted January 1, 2017 That all seems to make sense. Anyone care to explain how earlier marks without pumps or pressurised tanks got to high altitude though? How did a mark 2 with a merlin XII get so high without vaporisation? Could it be that the increase in fuel pressure needed with the strombergs obviously requires more suction from the pump thus lowering the fuel pressure in the tank more than the normal carb equipped merlins? Chris Link to comment Share on other sites More sharing options...
Friedrich-4B Posted January 2, 2017 Share Posted January 2, 2017 Good research. I think that covers my question... Thanks for all your work on this Friedrich-4/B, my curiousity is well satisfied. To celebrate, I repeated my earlier trial in the Free Flight IA mission, this time leaving the boost pump ON. No problems at all, clawed my way up to 41,000 w/o a hiccup, even w/o switching on the fuel tank pressurization. The DCS Flight Manual and Quick Start guide could each benefit from some attention in this area. The fuel system description makes no mention of the electric boost pump at all, nor does it appear in the various checklists for start-up, warm-up, climb and landing. It's ON by default in all the IA missions which begin with the engine already running, so clearly someone appreciates its importance. Glad to be of help; I struck the same problem during one of the few flights I've been able to make (with Christmas and holidays and trekking around, visiting relies etc) and figured it had to be vapour-lock. It shows how well ED's developers have replicated the Spitfire. And, yes the boost pump and vapour-lock would be worth a mention in the flight manual and QS guide: that should stop the air in computer rooms turning blue and vapourizing. :smilewink: [sIGPIC][/sIGPIC]************************************* Fortunately, Mk IX is slightly stable, anyway, the required stick travel is not high... but nothing extraordinary. Very pleasant to fly, very controllable, predictable and steady. We never refuse to correct something that was found outside ED if it is really proven...But we never will follow some "experts" who think that only they are the greatest aerodynamic guru with a secret knowledge. :smartass: WWII AIRCRAFT PERFORMANCE Link to comment Share on other sites More sharing options...
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