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Delays transonic drag rise and diminishes the wave drag - so faster in a dive with more control is one example.
This web page seem wort a look:
Tatsuo Hasegawa, Ki-94
One of the pictures linked there shows the flap system that looks like the version of Fowler flaps, that should allow for good low speed behavior.
Nice site Mr tomo pauk
But i got confused. It calls the TH airfoil , laminar flow
From what i have read ,that means that it was not supercritical airfoil.
all late war japanese fighters used fowler flaps as combat flaps .
I wonder why germans did not use them as well
The combination of laminar flow wing with combat flaps looks interesting to me
Here is the article about the supercritical airfoil, the TH airfoil seems not to be in that category.
Yep, their variation on theme were called 'butterfly flaps', mostly automatically operated IIRC?
Japanese were putting great emphasis on maneuverability, much more than another belligerents. The combination you find interesting should allow the 'Sea Mustang' to be a viable choice?
The Ki-94 page showing that airfoil and the Whitcomb airfoil are not the same.
The Ki-94 wing and airfoil resemble the P-51, which make sense as in it works use it.
Laminar flow reduced drag at zero incidence but also reduce lift at high incidence. There are always tradeoffs.
I agree. I do want to point out, however, that the "laminar airfoils" used in WWII did not produce extensive laminar flow in practice (laminar flow turned out to be extremely sensitive to small variations in profile and smoothness - even flush rivets would cause turbulent airflow). They did, however increase the speed of the aircraft by delaying compressibility issues.
The forum member "Glider" may have some more input, since gliders (sailplanes) have been the primary type of aircraft to successfully utilize laminar flow.
The supercritical airfoils were often touted as generating good lift at low speeds, but they did not catch on with slower aircraft. I recall that there was a flurry of attempts to use supercritical airfoils on some lower speed General Aviation and homebuilt aircraft in the 1970's and 1980's, but interest soon waned. As I recall, the airfoils required a disconcertingly large angle of attack at takeoff and landing as well as generating a large nose-down moment. There were likely other unfavorable characteristics of which I am not aware.
High lift is not required for high speed cruising, but it is required for the high-G maneuvers needed by fighter aircraft. The higher speed aircraft that use supercritical airfoils of which I am aware also utilize high-lift devices (leading-edge slats and slotted fowler flaps) for low speeds.
The distinguishing traits of the supercritical airfoils that I have seen are relatively large diameter leading edges, almost flat upper surfaces, and very noticeable downward cusps (curve) near the trailing edges. This was certainly not an intuitive design, especially at a time when very little was known about compressibility and the effect of shock waves. Indeed, the Whitcombe airfoil was not developed until the 1960's
Not-the-same Jim.
P.S. Wuzak, "is that all you've got", "you can do better" or "your grandma could fly better than you". I hope that you are happy now.
Mr nincomp
Very informative post. Excellent
What would be your proposition, for the wing of an ideal WW2 fighter?
Not in P 51 s case. It could out run and out manouver , out dive and out climb ,at the same time ,any of its opponents. At least that is the claim of many people. no tradeoffs for P51.