which coolant shutter position is best for mustang's speed?

Discussion in 'Aviation' started by Dawncaster, Apr 2, 2014.

  1. Dawncaster

    Dawncaster New Member

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    #1 Dawncaster, Apr 2, 2014
    Last edited: Apr 2, 2014
    51H_coolant_radiator.jpg

    As far as I know, mustang's radiator effect is...

    close to flush position = cooling bad but compression high and make high thrust with low drag. good performance.
    close to wide-open position = cooling good but compression low and make low thrust with high drag. bad performance.

    so, in my opinion, flush position had best performance or close, and automatic setting will choose flush position at close to max-speed.

    but I'm not sure about it.

    does anybody know detail?
     
  2. drgondog

    drgondog Well-Known Member

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    #2 drgondog, Apr 3, 2014
    Last edited: Apr 3, 2014
    It wasn't a question of good or bad as coolant shutters never fully closed and never more than 7.5 inches 'open'. The coolant Temp of 100C, coolant shutter position at about 2-3" IIRC equated with near maximum airspeed. At full shut the IAS is about the same as full open - and about 10mph below optimal shutter opening.

    At Takeoff and climb the shutter doors were usually near 'full open' as the airspeed wasn't sufficient to dump the oil and coolant temps.. at cruise and full throttle the coolant doors adjusted as required to maintain coolant temps at 100-107C and oil temps near 90C

    It was all about maintaining proper coolant/oil temps and the manual shutter control was replaced with an auto control for both oil and coolant doors
     
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  3. Dawncaster

    Dawncaster New Member

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    #3 Dawncaster, Apr 3, 2014
    Last edited: Apr 3, 2014
    auto control or not, it's not important for me.

    I wanted to know was just best coolant shutter position for speed. there is no considerations for temps and even engine failure.

    so, you mean

    this flush position

    il2fb 2014-04-03 23-26-10-56_a.jpg

    and this full-open position

    il2fb 2014-04-03 23-27-16-99_a.jpg

    have same speed?

    and flush shutter position has 10mph poor speed than optimal shutter position for maintain optimal temps?

    I would like to know more detail about how it is possible, for FM.

    as i see, mustang's rear scoop has enough size for thurst even with flush position.

    51h_coolant.jpg
    9726797019_890daf651e_51H_coolant.jpg
    F-51_coolant.jpg
    F-51H-10-NA Mustang 44-64633_coolant.jpg
    noram-p51h.jpg
    p-51h_annoucement_stiz_chopped.jpg
    il2fb 2014-04-02 10-47-16-56_coolant.jpg
    il2fb 2014-04-02 10-47-10-97_coolant.jpg
    il2fb 2014-04-02 10-47-26-06_coolant.jpg
     
  4. drgondog

    drgondog Well-Known Member

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  5. Dawncaster

    Dawncaster New Member

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    o_O! thanks! that is what I wanted.

    Now, everything became clear.

    P-51D had best performance with 15"

    coolant_position_P-51D_15342_Shutter_Calibrations.jpg

    P-51H had best performance with flush position (7")

    coolant_position_p-51h-64182-fig18.jpg
    coolant_position_p-51h-64182-fig17a.jpg
    coolant_position_p-51h-64182-fig17.jpg
     
  6. drgondog

    drgondog Well-Known Member

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    You should note that the P-51D plots are at 2700 RPM and 46"Hg - a cruise setting meaning less mass flow rate through the system
     
  7. Dawncaster

    Dawncaster New Member

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    hmm.. "flush position" is fixed or variable by condition?
     
  8. drgondog

    drgondog Well-Known Member

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    flush condition is when lower surface of duct is aligned with the fairing.. there would be a gap between the lip of the duct and the lower fuselage - as you have depicted in your last three screen shots on the 51H above.
     
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