On this subject we are quickly getting into area of weapons vs aircraft carrying them.
By that I mean if, for instance, a 500lb has a certain radius at which it will "kill" tank X then how important is it which plane dropped the bomb?
The Plane's only importance is if can deliver the bomb with significantly more accuracy than than another airplane.
I think this is indeed a big part of the issue and the crux of the argument.
If we do agree that rockets were potentially lethal but quite often seemed to be extremely
inaccurate, to the extent that at least a lot of the time (if not all the time) their effect was mostly psychological, then we are left with bombs and cannon (and for lighter armored vehicles, open topped, halftracks, AAA vehicles and emplacements, armored cars etc., heavy machine guns) as means of destroying armored vehicles and columns.
Certainly for bombing, the aircraft does indeed matter. I know some people think of bombers, any kind of bomber, as a "bomb truck" with the only really relevant factor being their bomb carrying capacity, but that is definitely not the case, whether in WW2 or today.
Which is the better anti-tank aircraft, A Bristol Blenheim with two 500lb bombs or a Typhoon with two 500lb bombs as an extreme example?
A Typhoon, without any doubt, for several reasons:
- The Blenheim had terrible bombing accuracy, in part because it was basically only a level bomber. Level bombing is an order of magnitude less accurate than even shallow-angle dive bombing. It is probably another order of magnitude less accurate than actual high angle dive bombing ala Stuka.
- The Blenheim had terrible survivability, because it was large, slow, not very agile, not very well armored, and ultimately highly vulnerable to both AAA and fighters. It had an appalling loss rate particularly in the relatively few cases where it was used for CAS.
- The Blenheim had no cannon or HMG to strafe with (even if you are only thinking about bombing in terms of destroying your primary target, strafing is a helpful way to suppress AAA while bombing)
- And to top it all off, the Typhoon actually carried a heavier load of bombs (2,000 lbs vs. 1200 lbs).
The Typhoon may not have been the best CAS aircraft, how good it was precisely I think is still up for debate, but it was beyond any doubt in my mind far superior to a Blenheim.
More broadly, I think one of the key issues here is whether some aircraft were substantially superior to others in the CAS role, and whether air support campaigns in different Theaters and in different periods of the war. For example did early successes with the Ju-87 influence the use of Tactical air support by Allied and Axis war-planners later in the war, even when they were getting very different results?
The Germans (and the Russians) used cassette bombs or cluster bombs to drop a large number of anti-tank bomblets over a wide area inorder to make up for the lack of accuracy of the big bombs, again how important to killing the tank is the type of aircraft?
Again, yes, absolutely. Loss rate per mission doing these extremely dangerous kinds of strikes would be a key factor. Il-2s had a horrendous loss rate but few aircraft could survive more than a mission or two doing that kind of very low altitude, persistent CAS. Blenheims for example got wiped out when they were used in this manner even in the early war when AAA wasn't as ubiquitous or effective. This is why the Anglo-Americans basically switched to fighters for that role, but fighter bombers while more survivable were less accurate (and they too suffered high casualty rates).
Type of aircraft is important for the survival of the aircraft crew against the defences the enemy tank force as a whole (most tanks had pretty lousy AA defences aside from their armor) could bring to bear, AA guns and general defensive fighter sweeps.
Many specialized anti-tank aircraft were never made in large enough numbers to really affect combat operations (large gun JU-88s fall in this catagory, lots of prototype/small production batches and much loved by modellers but overall effect on the eastern front was negligible )
this version
Lets keep something in perspective on this as it has come up before.
Soviet
Il-2 with 23mm guns - most widely used variant, at least 15,000 used (some of the ~30,000 Il-2 variants built during the war had 20mm guns or heavier calibers)
Il-2 with 37mm guns - unpopular due to stability issues but 3,500 were built and most were used in combat
Yak-9T with 37mm gun - 2,748 built, issued to squadron commanders, though there were problems initially, after design tweaks it proved very popular with performance not really affected. Main purpose was to destroy larger aircraft but they did have AP ammo and were also used to strafe tanks.
P-39 with 37mm gun - 4,719 delivered, most did not have AP ammunition and CAS was not their main mission but they were sometimes used in that role too and there were plenty of them.
German
Ju-87G with 37mm guns and "wolfram" ammo - ~ 220 built
HS 129 with 30mm, 37mm or 75mm guns - ~800 built
Anglo-American
Hurricane IID and IV with 40mm Bofurs gun - 296 Mk IID, 524 Mk IV (not all of the Mk IV saw action and some later had guns removed) overall maybe ~500
Other "heavy strafers"
B-25G and H with 75mm M4, M5 or T-13 gun - ~ 1,400 produced
Beaufighter with 4 x 20mm nose guns - ~ 5,000 produced
Ju-87D with 2 x 20mm cannon - 3,300 produced
Bf 110 with 2 x 20mm nose guns - ~5,000 produced (plus a few hundred Bf 110G with two x 30mm MK 108, and Bf 110G-2/R1 with 37mm cannon)
+ Fw 190 with 4 x 20mm guns, Typhoon, Tempest, Hurricane IID, etc. with 4 x 20mm Hispano cannon, the P-47 with the 8 x 12.7mm HMG, A-20 and B-25s with 6-10 12.7mm nose guns, P-38 with 1 x 20mm and 4 x HMG nose guns and so on. And nearly 60,000 Soviet fighters had at least one 20mm nose cannon.
So the anti-tank aircraft and 'heavy strafers' were not so unusual as implied, especially in the VVS. Even a few hundred heavy strafers with the larger caliber guns could and did certainly have an impact, but the Soviets had at least ~ 6,000 aircraft flying with 37mm guns (not counting the P-39s), several hundred with larger experimental guns (45mm Yak-9K etc.) and 15,000 or more Il-2's with 23mm cannon. To me that is a huge number which seems likely to have had an impact in their numerous victories after 1942, especially when you keep in perspective how long it was before they really caught up in tank and AT gun capabilities with the Germans. Given the production numbers certainly they were either insane or under a heavy delusions about the success of their CAS aircraft or they had a good reason to believe they did work.
And while I agree generally speaking the Soviets
were collectively insane, and they got in their own way quite a bit in the early year or two of the war, by say Kursk, they were rapidly re-organizing along meritocratic lines and increasingly effective against the German war machine. The war machine commanded by Marshal Zhukov was very lethal and the Il-2 was key component of it.
By the way, the Wiki on the Ju-87G mentions "
Hans-Ulrich Rudel, a Stuka ace, had suggested using two 37 mm (1.46 in) Flak 18 guns, each one in a self-contained under-wing
gun pod, as the
Bordkanone BK 3,7,
after achieving success against Soviet tanks with the 20 mm MG 151/20 cannon. " I know Rudel is a bit suspect as a source for a few reasons, but I would still call that evidence that the 20mm cannon was not useless against tanks.