HRIV,
If you want the old chestnut (Deighton, _Fighter_, page 94) the Me-109E had a turn radius of about 750ft. The Hurricane, 800. The Spitfire 880.
Now we have had a lot of data since then to suggest it was one of those 'it depends' conditions of altitude and airspeed (do we dewing the Auggie)
more than anything.
But I prefer Browns comparisons in _Duels In The Sky_ whereby he characterizes the Me-109F as _the best_ fighter in the world, bar none, for 1941.
You have a completely revamped, strengthened and cleaned up airframe (no more WWI 'braces', no more open air tailwheels, larger wingtips). Even the
controls were reharmonized and of course the 'slat problem' largely fixed by the F-3.
So that you have an airframe which is running on as much as 150 less HP than the Series 45 Merlin engined Mk.V Spit. Yet the airframe still has a
good 10 and even 15mph topspeed edge over it (ca. 382mph vs. 374mph at 20,000ft, more as the altitude increases).
And the 109F will outclimb it at almost all altitudes (at the time 3,640fpm was unheard of in Europe, the Mk.V was almost 500fpm slower).
With B-2 fuel, the horsepower edge is even and the Me-109F becomes a 400mph airframe at 27,000ft.
The only thing that kept the Friedrich from truly excelling (and it crippled the entire series) was the armament package in that it lost the second
cannon of the E and replaced it with a 15mm MG-151 variant while retaining the bb-gun MG17s. Mind you, you still got an increase of almost 300m/sec
over the MG-FF, so harmonizing the weapons packages along the centerline was relatively simple. But you had no gyro sight to make it workable at
range. Later F's got the 20mm IIRR but the 15mm was just too small to be a 'sure thing' fighter killer with 1-2 rounds.
Now, the reason I make this comparison is that if the 109F can readily beat the topline Brit air superioirity machine of the time. And the Spitfire
was the master of the Hurricane (be honest now). What is there to be said?
Well lot's actually. The Hurricane is underpowered and has poor drag characteristics thanks to that wing/nacelle configuration. It has decent lift
and fairly well balanced controls but this only makes it a 'chugger' in the form of sustained turns and fair agility (bank to bank in the horizontal
plane) at _low_ speeds.
The Hurricane was playing with about 1,150hp (The Mk.XX's was clapped and it's turbo useless weight at the altitudes being fought at in the desert)
at a time when the rest of the world was at 1,300 to 1,350. It's wing was too far forward and it's nose was poorly cowled. When you add the weight
of the later IIb/c wing armament, even the types decent loading goes away and it just...sags. Which is why it was a fighter bomber. And so gave away
yet another edge to the 'hun from sun' condition of not-it's-mission attention as much as positioning.
Good fighterpilots use control space through the dominance of planes. Out of plane maneuver requires high installed power because you are playing the
vertical almost constantly. It also requires good power and drag characteristics because when you go down, to add God's G, you want to accelerate
quickly.
Great fighter pilots use throttle to dominate TIME through the control of angles. Angles are a largely 2D fixed point of combat (though they can be
entered into vertically) in which high transient performance outweighs chugger turn.
Given that it is also more snapshot oriented than tracking if you can shoot, you can kill this way.
And it doesn't matter what the threat type is because the first HMG rounds into the wingroot or engine ends the fight. The first /cannon/
(explosive) round almost anywhere into the airframe, ends the fight (A P-47D, flown by Johnson to ONE 30mm round through the rudder/vertical tail area
and was instantly forced to retire, only the fact that the Germans wanted the B-17's that day saved him).
Marseilles was the preeminent snapshot artist of the war and he used both the native and transient (throttle-up/down) performance of the 109F to prove
it.
>>
Hmm, not exactly speed related, but...
Never was a fan of the Hawk/Warhawk/Kittyhawk, even less of the Airacobra, but that is probably because one of the first things I learned about air
combat was the Zeros ate P39 and P40 squadrons for lunch.
>>
The P-40 is an F4F for horizontal performance. A little bit cleaner, rather heavier, not quite as tight a turn, similar robustness and equal or
slightly lower (period) armament package. Yet it has dive performance more akin to a Hellcat. So long as you keep your speed above 300mph and your
altitude above 17,000ft, the Zero can't touch you. If you are advantaged bust his chops in the vertical. If you are not, unload and extend out,
there will always be other days. Another thing that needs to be remembered was that the Japanese 'protected' their airfields by exploiting the
range performance of their fighters. You sit in a 100` telephone booth for 4-5hrs and see how well YOU fight.
Facing a 109F, the P-40 has no vertical (up or down) edge and it weighs almost a third more (Kittyhawk, Warhawk is worse) while it's hp is roughly
similar to the Hurricanes. What this means is that while the 109 may actually have a higher loading, it's slats and it's power make it vastly
better in the BnZ or TnB fight which leaves the (Air Superiority dedicated) Kittyhawk little or no place to go. But at least it had the choice of
starting height, skysearch attention and no bombs/tanks/cannon under the wing.
Zeros are kite fighters. All climb, all turn. But only so long as the speed ranges stay in the area 220-250mph. You increase the density altitude
and they lose aspiration even as they lose lift and they cannot playup the speed because their rudder cannot defeat high power setting prop torque and
so their nose gets loose and tends to wander independent of bank angle. VERY hard to be precise with your turn if you are fighting elevator/aileron
to compensate for rudder loss. No nose control means losing all hope of being a good snapshot gun platform and the aircraft simply didn't carry
enough rounds to be a spray and pray hose machine.
In this, the Zero is closer to a 109E for weapons system design point (too few cannon rounds, no reason for the cowl guns, primitive sights) but it
doesn't have the latter airframes high speed/high altitude option to at least dictate the terms of the fight. Having traded it for pure vertical and
range performance at PTO typical altitudes. If you look at a Zero and say 'hmmmm, fast biplane!' you have it's number completely.
The P-39 is a hotship below 8,000ft. At 10-12 or so it's still competitive. Beyond that and you're riding a flung brick. This is more or less as
you would expect when you aren't shoving half a ton of high density steel around 'ahead of' your turn but have no turbo on a high wingloading.
It's roll rate is fabulous and it's turn rate acceptable if you don't push it beyond what it can do (it has some high speed stall issues not unlike
the 190s IIRR). It's clean and so accelerates reasonably well for it's weight.
What kills the P-39 is the lack of turbocharging (ironic considering the 37mm was originally a bomber killer), it's weapon package which is not only
hefty but slow rated for the caliber mix (.30's are /worthless/ and the P-39 has as many as six of them!) and it's wingloading. That wing is just
too damn small for higher altitudes, resulting in turn performance more like a late 109 (with too little power and no slats to play stall fighter).
To which I would add that there was never any real justification for the cabdoor configuration, if you can't shift the dorsal inlet someplace else,
you can sure as heck hinge the canopy one way or another. The pilot sits too low to have to look around foot wide frames at his 4 and 8 o'clock.
Obviously there are Russian pilots (Pokryshkin 48 of 59) who liked the P-39 a lot.
www.acepilots.com...
But then again, they were fighting at lawnmower heights and they had a lot of other considerations to take into account (working radios, rough field
conditions, extremes of environment). To which I can only say, they never had a Mustang or a TBolt to compare with. And they never played with the
RVD at 30,000ft where the bad guys /almost always/ had radar vectoring and height advantagement.
KPl.