NACA TN 1044 in depth look - ED Forums
 


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Old 02-03-2018, 04:51 AM   #1
Hummingbird
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Default NACA TN 1044 in depth look

I've been looking through the NACA TN 1044 report Yo-Yo says he has used as the basis for his lift coefficient figures for the P-51 & Fw190, and long story short there appears to be no reason for modeling a similar CLmax for the P-51 & Fw190, as the real life difference appears to be in the range of +0.2 in the Fw190's favour at any realistic dogfighting speeds.

TN 1044 report numbers summarized

Link to full report: https://ntrs.nasa.gov/archive/nasa/c...9930084610.pdf

NACA 23XXX (F6F, Fw190 etc) results:
FT high alt / FT low alt
M 0.30 = -- / --
M 0.35 = 1.35 / --
M 0.40 = 1.28 / --
M 0.45 = 1.16 / --
M 0.50 = 1.02 / --

NACA 00XX (P-39, Me262 etc) results:
FT high alt / FT low alt
M 0.30 = 1.20 / 1.24
M 0.35 = 1.12 / 1.18
M 0.40 = 1.05 / 1.14
M 0.45 = 0.97 / 1.08
M 0.50 = 0.92 / --

NACA 66-XXX (P-51, Tempest etc) results:
FT high alt / FT low alt
M 0.30 = 1.12 / 1.23
M 0.35 = 1.07 / 1.16
M 0.40 = 1.05 / 1.19 (2nd peak low alt)
M 0.45 = 1.02 / --
M 0.50 = 1.05 / -- (2nd peak high alt)


Note: One unusual phenomenon to be noted in the report is the sudden and very short rise in lift measured on the NACA 66 series at M 0.37 to 0.4 at low alt, and a longer one at high altitude from M 0.47 to M 0.65. This curiousity is noted on pages 10 & 11 in the report.

Last edited by Hummingbird; 02-03-2018 at 04:55 AM.
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Old 02-09-2018, 01:32 PM   #2
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For further confirmation the F4U-1, despite a slightly higher wing loading, rather easily beat the P-51B in turns during comparative trials:
http://www.wwiiaircraftperformance.o...1-navycomp.pdf

Snippets:

"each plane was loaded to it own specified full fighter load, 9,100 lbs. for the P-51B, and 12,162 lbs. for the F4U's"

"(c) The F4U-1 is everywhere superior in maneuverability and response."

The F4U also uses the same NACA 23015 to 23009 airfoil selection as the Fw190 & F6F.
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