No, I gave you a direct comparative. The P-47 had a COMBAT RANGE of 800 miles, the bF-109 had a combat range of 521 miles, the P-51 had a combat range of 950 (all of these are on internal fuel). The P-51 with drop tanks had a combat range of 1,650 miles. This does not mean it could fly out 1,650 miles on an escort mission and return (if that were the case it would have a combat range greater than the B-29 which could reach out 1,600 miles and return with a 10,000 pound bomb load). The formula for combat radius is (combat range/2)*.9 the result for the P-51D w/tanks is 745 miles
It means the P-51 (w/tanks) could take off, form up into a formation, fly ~700 miles out from base in high economy cruise, engage in air combat for roughly 20 minutes, and make it home with enough fuel to make at least two landing attempts. That is why you need to discuss combat radius not range. Range is only useful if you are taking off at one point, overflying your target, and landing at a different location (the USAAF occasionally did this with bomber mission flying out of the UK and landing at Allied air bases in Italy).
An aircraft like the Yak-9D had a maximum range of 2,285km (1,400mi) in absolutely clean unladen status with drop tanks, 845 miles w/o tanks. This is the ferry range. The P-51D had a ferry range of 2,300 miles, this means the combat range of the P-51 was 71% of its maximum range, and its combat radius was~30% of maximum range. If one uses the Mustang as a guide (which actually rather generous since the Mustang was a remarkably efficient air frame/engine combination) you will get a combat radius of 420 miles for the Yak-9D (which makes it, by far, the longest range Soviet fighter of the war) and a loiter time of around 30 minutes from the time it reaches the beach, more likely 20-25 by the time it is actually orbiting (this is just about what the P-47 managed over Normandy which was flown from similar ranges). The quick and dirty method of figuring out loiter time is to take the excess range of an aircraft, in this case the Yak and divide that by the cruise speed of the aircraft. In the case of the Yak this is 200/225 or 53 minutes Of course the Yak-9D was pure fighter, and a rather poorly armed one (the aircraft had one 20mm cannon and one 12.7mm (.51 cal) machine gun, with very limited ground attack capacity.
A better comparative is the Il-2 which comes out with with a combat radius of 225 miles. This leave around the ground attack aircraft with a ten minute loiter (I used 25 miles for the excess range since using the actual data of 200 out and 200 back would leave basically nothing, since the Il-2 combat radius is 202 miles, rather than come back with this result I used the ~500 mile range of the Il-10) Ten minute loiter is effectively zero unless you have a target already selected before the aircraft goes feet dry.
The figures for the Pe-2 are somewhat better. Using a cruise speed of 300 mph and the 200 mile out & 200 back you come back with a very reasonable 24 minutes of loiter. I am unsure of the effectiveness of the Pe-2 in the CAS role. The Soviets seem to have used it in the level bomber role, an attack methodology that is ill suited to the close support mission.
If the combat radius of the IL-2 is 202 miles & the distance is 140 miles that's 62 miles of flying within the combat area. It's max speed is 414km/hr (257Mph). It's cruise speed is 320km/hr(198Mph/hr). So 15min on station going nuts or 20min actually loitering. Finding a target should be pretty simple.. the destroyers are covering the roads on the coast. The air power is dealing with anything coming down the road going inland. Anything else is probably too mountainous. 'Comrade - follow the road on this map until you get to the shooting. When you get there, drop a bomb on the guys shooting towards the West'. 10min is enough. 15-20 is overkill.
One squadron of Il-2's (12 aircraft) circling can keep 2 overhead constantly as CAS. Having another two on the job mean the pilots only need fly 4 missions a day, something quite sustainable.
The IL-2 fought as a ground attack aircraft successfully, without having to (although it could) be a dive bomber. Initially it wasn't used as one & the cluster bombs it deployed were more evenly spread in a low level horizontal attack. When it was employed as a dive bomber the attack angle was only 30 degrees.
Now the Pe-2 *is* a dive bomber. That's it's role & designation.
http://www.youtube.com/watch?v=1T4gcII2afw
Here's a better translation of that amphibious portion of the attack plan:
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The report of the commander of the Pcific Ocean Fleet to the Commander-In-Chief of the Soviet troops in Far East with the description of the plan of the transferring of the 87th Rifle Corps to the Hokkaido Island and the southern islands of the Kurils
August, 19th of 1945
I an informing you about the plan of the transferring by sea the 87th RC to the Hokkaido Island and the southern part of the Kuril Islands.
1. The operation will be done in 3 phases:
a) Phase 1 - the trasnferring of one RD to the port Rumoi
b) Phase 1 - the trasnferring of one RD to the port Rumoi
c) Phase 1 - the trasnferring of one RD to the Kurils Islands through the Hokkaido.
2. The realization of the operation:
a) to concentrate on the airfields of Bladimiro-Olginskaia Naval Base the following air forces: 2 regiments of DB-3, 1 regiment of Yak-9 and 20 Yak-9T
b) to deply 4 positions of submarions from the directions of the Sangarskii and Laperuz straits; their task is recon and the destruction of enemy combat ships. Total - 4 submarines.
c) to make recon of the ports and naval bases of the southern Sakhalin, Hokkaido, Sangarskii Strait and approaches to the western coast of the Hokkaido from 19, August of 1945 with the task to define enemy combat ships
3 The transferring of the troops is to be done according the following: the first rush - one battalion of Marines and one rifle regiment on 6 landing ships under the guard of 4 destroyers and 6 torpedoe boats. The destroyers are to be used as artillery support ships in the case of enemy resistance, the torpedoe boats are to be used as landing means of the first rush in the case of auspicious conditions. The main forces of the rifle division are to be transferred by 6 transport ships under the guard of 4 fregates, 4 mine-sweepers and 4 large sub-chasers. The first rush forces are to go to sea with the expectation of arriving to the landing region - port Rumoi - 2 hours before the arriving of main forces of the rifle division.
4 Protection: 2 destroyers and 6 torpedoe boats "Vladimir". The fighter aviation is to cover all the forces during the transferring, the bomber and torpedo-bomber aviation is to be in the zone of waiting over the port Rumoi by the time of the arriving of the ships. Air strike against the port is to be done only after the sign of the landing commander. Rear Admiral Sviatov is to command the landing. I do the common commanding of the operation.
The ships are to be ready to load the first division by 12.00 of August, 19th. Coming out - 20.00 of August, 21st. The landing - 05.00 of August, 24th. The loading of the other troops - as far as transport would come back.
Ask your approving.
Commander of the Pacific Ocean Fleet Iumatov,
Member of Military Council of the Pacific Ocean Fleet Zakharov
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Of interest is the presence of the DB-3's (about 120 of them), a twin engined bomber the 1937 variant of which has the ability to carry a bombload of 1000kg for 1900 miles or 2500kg for shorter distances.
http://www.youtube.com/watch?v=M79XqeLhgq8
This should suggest once the Soviets take Rumoi they can bomb (what's left of) Tokyo.
edit, adding further info)..
As to whether they can get tanks ashore, in the first wave, their LCI(L)'s of which they have 25 (originally 30, 5 were hit by coastal artillery in the attack on the Northern most) can carry either 200 troops or up to 75 tonnes of cargo. These would seem to be the types of 'transport ships' mentioned above. For those still not convinced of their ocean going capacity after they sailed from Petroplavosk to the Kurils direct, some of the same types of ship were involved in operation Torch, sailed from the U.K to North Africa across the Atlantic.
This page notes the composition of a Soviet Rifle regiment -
http://canuckcommander.pbworks.com/w/page/14311324/WW2 Soviet Wargaming as organized for attack.
3 Rifle battalions and a Tank Battalion, more typically a SU-76 battalion or 4 rifle battalions.
A 'regiment' of Su-76's is going to have around 16-20 examples. A 'battalion' should therefore have around 4-5.
The Su-76 'self propelled gun' weights only 10 tonnes. It's frontal armour at 35mm is impervious to the 25mm penetration capacity of the 57mm gun on Japanese medium tanks. It was primarily used in attacks on the Eastern front where other units couldn't go like swamps do to it's low ground pressure. Useful for getting over beach sand. Can offer artillery support with an indirect max fire range of 17km. Seems if the Soviets deem tank support necessary from the get go they can get it. After they take the portside docks at Rumoi merchant ships can bring in larger quantities.