For further comparison, from the
Soviet turn-time tests
P-40 B/c turned in about 18 seconds (both directions)
P-39D turned in 17.7 seconds (left), 18.7 seconds (right)
Spitfire VB turned in 18.8 seconds (both)
Spitfire LF IX turned in 18.5 seconds (both)
P-40E turned in 19.2 seconds (both directions)
Hurricane IIA turned in 19 seconds (left) or 20 seconds (right)
P-39Q-15 turned in 20 seconds (left) or 21 seconds (right)
Bf 109F-4 turned in 19.6 seconds left, or 20.5 seconds (right)
Fw 190 A4 turned in 22 seconds (left), or 23 seconds (right)
I don't know, it's still a significant advantage against a P-51. It will not out-turn a Spitfire necessarily though, and probably not a P-40 either if the latter is using flaps.
Yes, but the Soviets have the heavier FW-190A-5 with the longer nose down to one second less, 21 seconds left/ 22 seconds right.
The A-5 being heavier than the A-4, this clearly shows there is an effect going on within the space between the wing and the prop, given the difference is a 6 inch longer engine bearer (150 mm). More on this at the end.
I think the turn times of the FW-190A could be smaller than the Soviet figures because the 190A had this peculiar excess of lift when the speeds got below 220 knots:
"
Duels in the Sky", Eric Brown: "
It [the change in pitch trim] could easily be gauged in turns. The FW-190 had a tendency to tighten up in a turn. Above [355 km/h], backward stick pressure was required."
This means that the 190A "self-tightened" the turn, and that the pilot had to
push on the stick to keep the nose down(!), but this only after the speed during the turn crossed down through that 355 km/h threshold (roughly 220 knots).
Another pilot described that he deflected the 190's ailerons to keep the wing from dropping during low speed turns. So now we are talking about the best FW-190A sustained turn performance being achieved with the the stick
forward and sideways...
To top it all, despite the FW-190A being fairly quiet in the cockpit compared to most inlines (as a general rules, powerful radials were quieter in the cockpit than most comparable inlines: Ki-84s, P-47Ds, FW-190A were all easier on the ears than the P-51D or Me-109G), the FW-190A had this peculiar vibration in the control stick that killed your sense of touch... (This is usually considered no big deal: The current Super Stallion helicopter has the same issue).
However it does pile up: You have to
push to keep the nose from going
up, AND deflect the stick sideways to cancel the wing drop,
all this without the sense of touch... It is no wonder some US pilots observed "
FW-190A pilots seem to be afraid to "reef it in"...."
I think the Soviet turn times are inaccurate for the FW-190A for these reasons, and that the true figure was more like 18 seconds left, and barely any more than that right. (The FW-190A seemed to have been very asymmetrical in hard turns -extremely poor in hard right turns-, but not at all asymmetrical in sustained low speed turns)
The Soviets have the needle tip P-47D Razorback at 27 seconds, and that is clearly an absurd bias: The Razorback with needle tip prop was the better turning variant, and anecdotally it could, and did, match turns with Me-109Gs, on the deck,
while carrying two 1000 lbs bombs... The paddle blade and Bubbletop versions were worse, but 19 seconds left and 21 seconds right should be close for the needle tip Razorback, with the Bubbletop more symmetrical at 23+ seconds both ways. Like the FW-190A, the P-47D did not like hard stick pulls, so they both tended to mush forward and waste speed with careless stick pulling, even at high speeds, the 190 being the worse of the two. This explains why some pilots complained about their handling, but this high speed mushing had no real relevance to low speed sustained turns.
The Soviet turn times I believe are accurate for the P-40E at 19 seconds, though the N may have had more turn asymmetry by being slower to the right. It is important to understand that the
main asymmetry issue for sustained low bank angle turns (there are about 3 different effects: P-factor -affects high G/high bank angles, or level climbs-, torque -affects roll- and finally the air spiral) is the complex phenomenon of the prop spiral interacting with the aircraft's unique shape: This effect also sometimes reversed direction above 250 mph -as with the Me-109-... All types were not affected in the same way by their prop spiral.
The following quotes put the Me-109G-6 and FW-190A into what I think is the correct perspective:
-James E. Reed 33rd FG (P-40F, Casablanca): "
The FW-190 was tough to out-turn. I could out-turn the 109, but it was hard to do. I, at times, had to drop a few degrees of flaps and slow down to out-turn it. I understand that the FW-190 was harder to get away from than the 109."
The
I understand is key here, because it actually
strengthens the statement: It means that this is
not from his own limited experience, but that this was the word going around
from the combined experiences of the entire group.
One day,
while failing to out-turn a Me-109G, Reed dropped his landing gear partially to slow down even more (the gear initially drops in the manner of a flap on the P-40), and he credits this momentary "turning edge" with saving his life...
That P-40-matching performance would peg the true Me-109G sustained turn performance at around 19 seconds left and 21 seconds right, similar to the Razorback P-47 with needle tip prop. 36 kill Fin ace Karhila claimed that dropping power helped his turns on the Gustav, so that might be the key to getting down from the slightly higher 20 left 21.6 right of Soviet 109G tests...
Concerning the Spitfire, reading Clostermann and other pilots, they clearly describe a very good hard initial turn (allowing a momentary angle advantage to "shoot across the circle", but still a significantly lesser sustained turn performance on all Marks of the Spitfire. RAE minimum turn radius on the Spitfire Mk I was quoted as 1025 feet, 880 feet on the Me-109E, and 800 feet on the Hurricane Mk I (not clear if these are sustained speed or not, but clear enough in their implications).
I think, based on this, that the Mk V was, at best, 20 seconds sustained, probably going faster and wider than 109s or 190s (20 seconds is for at least
one Soviet test). The Spit is always quite symmetrical in turn and bank, with the exception of the Mark XIV in rolls. The Mark IX was probably around 21-22 seconds, and the Mark XIV 22-23 seconds, perhaps even worse... My understanding is that the Mark XIVs were
not popular with front-line pilots...
As I said, the Soviet turn times I have encountered place the Mark V at 20 seconds,
but also the Mark IX at 17 seconds(!), which is contradicted by Soviet experience in battle. (I think they allowed some speed or altitude drop to get 17 seconds: There is no way to my mind this is with a flat circle and sustained speed.):
-"
Le Fana de l'Aviation" #496, p. 40 (Soviet Spitfire frontline experience): "
The Spitfire failed in horizontal fighting, but was particularly adapted to vertical fighting."
Confirmed by Clostermann:
-Audio from the past, Pierre Clostermann (18 kills, record 432 RAF combat missions, master of ceremonies at wartime symposiums on Luftwaffe aircrafts): "
Aaaah the legends… Legends are hard to kill. One of those legends is that the Spitfire turned better than the Messerschmitt 109, or the FW-190. Well that is a good joke... Why? First and foremost, in a turning battle, the speed goes down and down, and there comes a time, when the speed has gone down below 200 knots, that the Me-109 turns inside the Spitfire."
Clostermann operated mid to late War or very late War, so mostly with Mk IXs... The Soviet claim of 17 seconds (3 seconds better than the Mark V) is also contradicted by current Warbird operators that operate both the Mk V and the Mk IX concurrently.
It is interesting you have Soviet figures of 18.5 and 18.8 for the Mk IX and V respectively. I had neglected to note those down, if I ever saw them...
Many will notice, if the above estimations are true, that there hardly seems to be any linear relationship between wing loading, power loading and sustained turn performance. I think this is a still unknown effect that the pilots of the era called "hanging on the prop", which is that there is an untapped load potential for the prop, and the wing drag can deflect air towards the prop to exploit it, increasing their own drag by changing the leading edge airflow angle, and thus the prop's tractive load in what I call the "pull-push" effect of air being "sucked", then "compressed", between the wing and the prop, and this occurring
only within the curvature of a horizontal turn. (It could not happen in loops, because loops unload the prop for half of the circle, and rely on that momentum for much of the other half)
The P-40 clearly turns better than what you would expect, but nothing even comes close to the gigantic 70%+ anomaly of the FW-190A... By creating tension between the wing and the prop, you have the same effect as pulling on both ends of a rope, which will lift the middle. Radial engines and/or straight (or at least less swept) wing leading edges seem to accentuate the effect.
Further supporting the theory, the only pusher prop fighter ever to enter service, the SAAB 21, had a large 22.2 square meter wing (nearly the size of a Ta-152H wing (23 sq m), and yet had a very mediocre turn handling, being relegated to ground attack duties... The Me-109G, with the same engine and a 16 sq/m wing, would likely run rings around it... Clearly using linear calculations will be of no help in predicting how each type ranks in low speed turns (that linearity appears to make a return at high speeds, since the upward "sucking and compressing" of the air seems to abruptly go away above 220-240 mph, if the FW-190A's trim behaviour is any guide: This explains why the Spitfire performs much closer to expected in high speed turns).
I think it is useful to go into the weeds like this, because the true forgotten story of WWII air tactics is that everyone started with the assumption dogfighting was dead, and then spent the entire war un-learning what they were being told in training.
As P-47D ace Virgil K Meroney said: "
The problem with new recruits is we are having a devil of a time getting their training out of their heads."
Read P-47D Encounter Reports from aces with a lot of kills (or really
any among the 800 I have sifted through more than twice), and practically
all you read about is
constant turning... Aside sneaking up from below, unaware targets are rare,
and dive and zoom tactics are next to non-existent. Spitfire Encounter Reports are the near-mirror opposite: Enormous amounts of diving and hard maneuvering at high speeds. That is practically all the later Spitfires (from IX and up) ever do.
Not what you'd expect.