The P51 does have low drag, but why? Is it really because it has a laminar flow wing and a thrust producing radiator. Let's take a look!
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Sources:
Quest for Performance, I sometimes refer to this book as Evolution of Design:
https://ntrs.nasa.gov/archive/nasa/ca...
Wind and Beyond:
Part 1 https://history.nasa.gov/SP4409%20vo...
Part 2 https://history.nasa.gov/sp4409vol2...
Part 3 https://history.nasa.gov/sp4409vol2...
Part 4 https://history.nasa.gov/sp4409vol2...
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Note:Regarding the comment at about 20:50, I'm not 100% clear on what number I should be using in the calculator, 1.0, or 1.171. On page 4 of Quest For Performance it mentions both numbers, and I'm not sure which one they used to come up with that 3.57 number. In either case, it won't effect the relationship of 109 drag to the P51 so I'm not worried about it at this point, but I'll have to sort this out in the future.