Which was the more successful single engine dive bomber, the SBD, the JU-87 or D3A?

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It's true that the Skua downed a number of Luftwaffe aircraft, but how many were Skua versus Bf109 or Fw190 confrontations?
No more than any other dive bomber shot down single seat, high performance fighters. How many Spitfires did the Stuka shoot down? Some by chance of one crossing the gunsights I imagine, but not many.

It's too bad that the Skua was withdrawn from service in 1941 just when things were getting exciting for the FAA. Two dozen Skuas joining the twenty-odd Swordfish at Taranto would have been impactful, though dive bombing at night would be a first and require a pathfinder to find and market targets. Next, Matapan, Skuas attack V.Veneto from above whilst the TSRs strike with torpedos. Throughout the Mediterranean the Skua would have been useful in anti shipping missions. My vote is to keep the Skuas until the "fast" bomber role can be passed to the Fulmar.
Which carrier should the Skua have sunk but didn't?
Which carriers did the Stuka operate from?
I've never understood the utility of these sort of rebuttals. Is it to shut down the other guy, to demonstrate one's own superior argument? It just seems meanspirited to me.
 
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Which carrier should the Skua have sunk but didn't?
If given the opportunity the Skua could have sunk carriers. Put four squadrons of Skuas at Ceylon in March 1942 and Nagumo is in deep trouble as the Kido Butai did not operate a CAP as it closed on Ceylon. Nagumo's carriers will be matchsticks to any dive bomber.
 
Granted the Skua sank several notable ships like Konigsburg (although the attack on U-30 should not be spoken of) and they did well intercepting bombers and flying boats, but their attack on Scharnhorst revealed that they were not able to defend themselves well enough against the Bf109.

It would seem to me, if we're looking for a decent native dive-bomber, then perhaps examine the Fulmar a bit closer.
While it carried a comparable bombload (in weight), it was faster and better armed.
Granted, like most dive-bombers, the Fulmar suffered losses against Japanese, Italian and German fighters but it's long range made it ideal as a scout and path-finder - which would put it a similar role to the USN's Scouting-Bomber.
 
I've never understood the utility of these sort of rebuttals. Is it to shut down the other guy, to demonstrate one's own superior argument? It just seems meanspirited to me.

I mean to say the circumstances in which the Skua and Dauntless operated are so vastly different that using number of carriers sunk as a metric in determining their worth is pointless.
 

We were discussing front gun efficacy, which was one aspect of DBs

Which dive-bomber could defend itself against BF109s and FW190s?
 
I suggest we exclude the opportunities for success that define each contending aircraft, and instead look at their potential for success. Which single-engined dive bomber:
  1. Carried the heaviest bomb load?
  2. Had the fastest speed (cruise, top and dive)?
  3. Had best ability to hit its target? Dive angle, visibility, bombsight, etc.
  4. Had the the greatest survivability against AA and fighters?
  5. Was available when needed? No point in including the Yokosuka D3Y or Fairey Spearfish, for example.
I would add on top of these five the longest range or endurance, but this is more a naval DB than general DB requirement.

I like the Vultee Vengeance. One of the few DB with an internal weapons bay, 275 mph top speed, four forward .303 mgs, plus two in the back, 1,500 lb. bomb load (2 x internal 500 lb, 2 x 250 lb under wings), 1,400 mi range. First RAF squadrons commence ops in Oct 1942. What's not to like?
 
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Something to consider for the dive bomber as a weapon system, even more important than guns, is the bombs/bombload.
Unfortunately for the Skua the British 500lb bombs were not exactly awe inspiring in the early part of the war.
Standard bomb for the Skua was a 500lb SAP bomb with about 90lbs of TNT.

IF the release mechanism could be adjusted for the 500lb GP bomb the HE content went to about 145lbs HE but perhaps not as good as TNT.
Some American or German GP bombs held about 50% explosives.

Later British 500lb MC bombs went about 50% explosive weight but the are not available in the first few years.

A Dauntless that hit a Japanese ship with a 1000lb bomb may have hit it with 500lbs of HE.
 
In regards to the many interesting comments and opinions on dive bombers, I think the one critical feature that has not been mentioned is SURVIVABILITY. A plane has to give its crew a reasonable chance to reach it's target, attack and return, or every sortie potentially becomes a depressing suicide mission.

In that case the self-sealing tanks and armor of the SBD appeared to give it an advantage over the others, surely the Val. No better illustration can be given then at Midway, June 4th, when Hiryu's counterstrike of eighteen Vals took off in search of the American carriers after three of it's sister ships were in flames. The Vals were the most experienced of the Kudo Butai, and escorted by six Zeros. On the way, they encountered a flight of six SBDs straggling back and the Zero's impulsively left the Vals and tangled with the now emptied American dive bombers.

The Zeros destroyed no SBDs and in the process had two of their own so badly damaged they were forced to break off and return. The remaining four Zeros were too far behind and when Yorktown's CAP of eight Wildcats were vectored to the now unescorted Vals, the Wildcats savaged the flight, shooting down nine of the vulnerable Japanese dive bombers and scattering the rest. Admirably, the remaining determined Vals continued on and seven ultimately made it through to drop their bombs, but this might be considered as weight of numbers.

When considering six SBDs were attacked by six of the cream of the Japanese fighter force and suffered no losses while damaging two Zeros, and eight Wildcats destroyed nine of eighteen VALS during that early stage of the war, when experience and training were hugely on the side of the Rising Sun, the tough American dive bomber surely demonstrated it superiority in the Pacific.

In Europe, the Stuka was withdrawn from combat in areas once German air superiority was not maintained.

In conclusion, one may conjecture or opine ad nauseum about the various aspects of an aircraft, but even before anything else is considered, the Number One issue that must be considered is -- can it bring its crew back?
 
It's a bad idea to dive-bomb an armored warship in general, especially if you are the only airplane in the sky at the time, but many were successfully attacked by dive bombers.
Carrying the bomb(s) was not required per the question:

The article itself illustrates the Japanese's devastating Indian Ocean dive bombing attack on two experienced british cruisers, Dorsetshire and Cornwall, sending both to the bottom, along with the carrier Hermes.
 

In fact, none of the 6 x SBDs that encountered the Zeros made it back to any USN carrier or base and all 6 aircraft and their aircrew were lost.
 
Warships for the most part, had armored decks to protect themselves from an adversary's "plunging fire" long before the advent of dive-bombers.
I am not sure if the warships designed during the early-middle part of the war factored in the prospect of aerial bombs or not.

I am certain that they took note of what dive-bombers were capable of.
They certainly provided a considerable upgrade to AA defenses in any case.
 
Outside of destroyers, isn't every warship armoured against vertical attack? HMS Hermes, for example had a 1" armoured deck, shown below as the floor to the hangar deck.

Yes and no.

During WW I most ships larger than destroyers had armored decks. However the "protection" was often to keep shells from descending into machinery spaces and magazines.

This is the set up for protected cruiser (smaller than an armored cruiser)
Red is armor and grey are coal bunkers. If full the ship had a lot more protection than when empty A certain number of feet of coal was figured to be worth 1 in of armor. With the coming of oil fuel this protection went away. Most Navies were still building coal fired ships until the end of WW I.
Everybody shifted to oil fired (or at least mixed firing) during the 20s and just about everybody used oil firing in the 30s.

However the 20s and 30s were the era of treaties and size limits on ships. It took quite a while to work out what could and could not be done and the machinery was making constant improvements. Fuel was often not counted in the 'weight' of a ship (you still had to count the structure that acted as fuel tanks) and a more modern ship that could make the desired power with a power plant weighing hundreds of tons less than an old power plant had those hundreds of tons to put into armor.

Many of the 1920s heavy cruisers (8 in guns) were referred to as either "tin cans armed with hammers" or "eggshells armed with hammers."
The early British County class cruisers had armored boxes around the magazines, armored ammunition hoists 1 in on the gun houses and smatterings of armor in other places (steering gear) although there seem to be a lot of discrepancies in descriptions. Some of the pre-war descriptions may be a bit optimistic?

1in of armor is not very much protection at all unless the projectile is coming in at quite an angle. In fact against shells decks of around 1in in thickness were often referred to as "bursters". Causing the large shell to burst (detonate) right after penetrating the deck but before the shell could get deeper into the ship. When a 2nd deck was used it's purpose was to catch the shell fragments.

This is a very general view and exceptions can easily be found. A 1938-40 cruiser design will be quite different than a 1924 cruiser design.
For instance a Kent used about 1830 tons of machinery to make 80,000hp while a Fiji used only 1440tons to make 80,000hp.
 


Well, it wasn't until the mid to late 30s that very many ship borne aircraft could carry a 500lb bomb as a dive bomber.
This plane made it's first flight in 1933

didn't go into service until 1935.

for a battleship, it they had deck armor to stop a 13-16in shell coming down at a 40 degree angle or better then they probably could keep a 500lb bomb out of the protected areas of the ship.

Cruisers not so much.
 

As far as being effective to a degree against other planes, weren't SBDs given CAP duty over the carriers, especially against the threat of torpedo bombers?
 

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