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    Sticky: More Supercharger Tuning

    Up until a week or so ago, I was certain that the implementation of Superchargers in Combat Flight Simulator was incorrect.

    There are two factors in the implementation that appeared to be less...
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    Sticky: Exhaust Thrust - Version 2

    The problem with doing a tutorial and the reason I am generally quite reluctant to actually do one is because they are generally monologues with no sanity checks of any kind. They hopefully...
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    Sticky: Test Flight

    Hello All,

    Attached is a copy of the "FW 190D" Test Aircraft that resulted from the basic P-51D after modifications.
    Note that I also edited the Horsepower from down to 1500 so that the sound...
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    Sticky: Propeller Animations

    I like the Propeller(s) on a AF99 / CFS project to behave in the following manner:
    At Idle RPM, the Blades are completely visible
    As RPM is increased, the Blades become Transparent and a...
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    Sticky: Tuning Idle RPM

    Generally I prefer the Idle speed to be somewhere between 450 RPM and 600 RPM.
    The easiest way to set this is to used Record 506 to specify what a closed throttle means.
    The original value here was...
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    Sticky: Service Ceiling Test

    The end result of the edit to the CL Graph was that the Service Ceiling test worked out pretty much as expected.
    The airspeed is a touch higher, the Power required is a touch lower and the Service...
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    Sticky: ReTest Complications

    Re Testing the flight performance should have been easy.
    It was.... Up to a point.

    The Speed Run at 500 feet altitude gave 359 mph
    The Speed Run at 21650 feet gave 427 mph with 1516 HP.
    The...
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    Sticky: Re-Tuning the Engine

    Adjusting the Torque down a bit (0.555 to 0.54) gets us
    1661 HP @ 500 feet with a speed of 359 mph

    Adjusting the Supercharger Boost Gain up a bit (3.24 to 3.33) gets us
    1511 HP @ 21650 feet for...
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    Sticky: Starting Over Again!

    Now that we have gotten this far, believe it or not, we are about to start over again.
    The difference is that this time we have a VERY good idea of the values we need to achieve the intended flight...
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    Sticky: Testing Engine Power

    Now that we have proper engine power at Critical Altitude and Sea Level, the next step is to see how the entire curve looks.
    I generally test Engine Power at 2500 foot intervals. It is hard to test...
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    Sticky: Matching Level Speed

    Guessing the amount of Engine Power required wasn't difficult. I simply used the MW50 War Emergency Power and throttled back until I was getting a bit over 426 mph. Perhaps my joystick (Sidewider...
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    Sticky: Flight Performance versus Engine Performance

    This tutorial is about tuning Engine Performance, but the end result is to make our Flight Simulator aircraft perform as the actual aircraft did. There are factors in the simulator that we cannot...
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    Sticky: Tuning Medium Altitude Performance

    The maximum speed for the FW 190D was achieved at 6600 meters or 21650 feet.
    On the graph in the last post, engine output looks to be 1440 PS.
    The conversion factor is 1.01387 so this is equivalent...
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    Sticky: Target Engine Power

    Attached is an annotated graph of Jumo 213A Engine Power.
    The Blue shows the specific power curve we are trying to approximate.
    The Red Dots show the three points at which we will be trying to best...
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    Sticky: More Engine Power Graphs

    Here are a couple more Engine Power Graphs.
    Please observe that the forms are quite similar.
    The number of peaks corresponds to the number of speeds in the supercharger.

    The Merlin graph is...
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    Sticky: Thanks, No Dice. I had thought this thread...

    Thanks, No Dice.

    I had thought this thread would be much easier than this.
    I thought I would be done after posting the next installment about tuning supercharger settings, but there is still:...
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    Sticky: Engine Power Graphs

    Pardon the poor quality, but these two graphs give an idea of how the actual engines performed.

    There are several things to note here:
    The BMW 801D test is from 1942. At this time, 1.42 ATA...
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    Sticky: Target Performance

    It helps to know how well the actual aeroplane performed in order to properly simulate it.
    My data comes from a flight test by Kurt Tank flying a FW 190D-9 in autumn of 1944.

    With the Take-Off...
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    Sticky: Critical Altitude

    The next step in Engine Tuning is to set the "Critical Altitude".

    "Critical Altitude" can mean at least two things:
    1. The maximum altitude at which the Engine can maintain Sea Level Boost...
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    Sticky: Edit and Test Cycle

    I will leave the 1800 HP tuning as an exercise for whomever wants to try it. The starting AIR File was posted as Basic Engine Parameters.

    The Edit and Test Cycles can be done very quickly:

    The...
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    Sticky: High Altitude Comparision

    Attached are two screenshots showing the power output of these two engines at altitude.

    Note that the stock supercharger values are much too high and are providing too much power at this altitude....
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    Sticky: The Different Ways of Tuning

    Attached are two screenshots showing the results of Reducing Torque and of Increasing Friction.

    Stock Torque multiplier is 0.56. It was reduced to 0.53 to get 1620 HP (Actually 1621 HP).
    It took...
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    Sticky: Good or Bad - Depending on Outlook

    Values that match exactly what you are looking for are good if the goal is something to be used in a project. For a tutorial, this is bad because there isn't an opportunity to demonstrate how to...
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    Sticky: First Flight Test of the Jumo 213A

    The First Flight Test was either very good or very bad depending on your point of view:

    Without changes to anything other than what was specified in prior posts, the engine power at an altitude of...
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    Sticky: FW 190D Basic Engine Installation

    I finally got around to installing the JuMo 213A in the FW 190D basic AIR File and took it for a test flight. Attached is the updated AIR file.

    Here is what was changed: (All unstated data has...
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