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Though I guess there's nothing really contradictory about both Tu-2 and Tu-2S not having air brakes. It just seemed a bit odd to list the removal as a change on the Tu-2S if the brakes were already removed on the Tu-2
Do you know if the DB-3T and/or IL-4T carried extra fuel compared to their standard bomber counterparts? Soviet Combat Aircraft of the Second World War lists the range of the DB-3T as 1800km while I've found a figure of 3800km for the Il-4T online. The first figure is much lower then the range figures listed for standard DB-3s and makes me wonder if someone made an error while typing, while the later figure is actually a little higher then the range usually listed for a standard Il-4.
A very different question: was it common for Soviet fighters to use bombs and rockets to support ground troops, or was that mission left to the bombers and shturmoviks?
The order you quoted above about the removing of the air brakers beginning the 6th plane doesn't reffer to the Tu-2S but the to the Tu-2 ( plane 103V ) assembled by the factory no.166. As you may noticed in the pics posted above the factory attached them to the initial series of the bomber. So again a matter of translation I would say.
The difference in the range you found , is because the range depended on the bombload. Many authors just simplified their statements for the range without saying what was the bombload or if it was the maximal range. The TBiU no.223 booklet for the DB-3/Il-4 says that the range for DB-3 was 2000km while the DB-3A 1600km , DB-3B and DB-3M had 1500km. DB-3F and Il-4 1800km. But it is the range with the maximal bombload. The maximal range for DB-3/DB-3A was 4000km while the DB-3B 3800km, DB-3M 3500km, DB-3F 3300km and 4200km for Il-4. The maximal range is for the standard bombload for all of them that was 1000kg. The maximal bombload was about 2500kg. So with the maximal bombload of the 2500kg the range was about half the size . Also it appears that the range depended on the year and the factory the tested plane was made by and modifications introduced.
According to a note in the mentioned booklet the DB-3T and Il-4T didn't vary too much in the data from their bombing version these based on.
Regarding the extra fuel for DB-3T/IL-4T... the info can be found in the booklet as well. It states that DB-3/Il-4 could carry additional external fuel tanks on the external racks. So the torpedo variants could do that as well. But not sure if these were attached when the torpedo was racked though. I haven't seen any image of the T version with the additionall external fuel tanks. A shot of the bomber yes I have ... see below.
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I wouldn't say it was common. Let's say, for the reason there was designed so many variants of a plane. Just if a such assault plane was needed at the frontline, a plane with the kind of armament was introduced. It can't be said that there were the soviet universal planes at the beginning of the war. However, at the end it can be noticed that the soviet aircraft became more multi-purpose planes.
google translate said:The standard Tu-2 was characterized by the following changes:
They were removed from the aircraft, but can be delivered by special order:
a) brake grids with a control system and grid communication with a dive machine,
b) AK-1 heading machine,
c) gas tanks No. 8, 9 and 10 (the decrease in the amount of fuel is compensated by the increase in the volume of tanks No. 1, 6 and 7),
d) ShKAS front machine guns.
The hydraulic system, made according to a simplified scheme, is characterized by:
a) transition to one high pressure system,
b) combining the control of the front, side and oil flaps for one control with a mechanical connection between the side and oil flaps,
c) removing the automatic thermostats,
d) transferring the main lines to the area of the front spar, where they are protected by armor, gas tanks and structure,
e) removing the automatic control of the stabilizer, which is fixed motionlessly,
f) replacing the hydraulic control of switching the speeds of the motor superchargers to a mechanical one,
g) transferring the hydraulic reservoir and manual pump into the forward cockpit, behind the navigator's upper armored shield.
The game mod I am gathering information for has both fighters that can only do air to air and fighter bombers that can do air to ground and air to air. The mod team decided that just being able to carry bombs is not enough to make a fighter a fighter bomber. They decided that it needed to be used for ground attack often. So a Spitfire would not be considered a fighter bomber even though some could carry bombs, but a Typhoon would be considered a fighter bomber because it frequently carried bombs or rockets. That is why I wanted to know how often Soviet fighters were used to do ground attack -I wanted to tell if the game should see them as fighters or fighter bombers.
One thing I forgot to mention is that a lot of the D through M model P-40s on could carry a number of light bombs under each wing using internal racks. I do not know if it applied to all or just some. It was on all M model aircraft so I would suspect all D through M.
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I am particularly interested in early versions of the FW-190's BMW 801. I did find a site with charts for many different DB 601 and 605 variants but only a few of the charts specified the time limits for the various settings.
Perhaps the table might be useful? BMW 801C here: link
Please note that table also have the sections for different ram effect values, IOW the HP vs. altitude at different speeds.
Chart for 'Steig & Kampfleistun' setting (30 min duration) for different ram values for the 801C: link
Also note that both table and chart has values for exhaust thrust (in kg).
A more complete chart for the BMW 801C can be found at the pg. bottom of the pg. 218 of the 'The secret horsepower race' book, 1st edition. Only static values,, ie. no ram effect.
Please note that both table and Calum's chart account for 2550 max rpm with supercharger in high gear for the 801C. However, it seems like that engine was run at 2700 rpm with S/C in high gear during these tests - link - so we might assume that, after winter of 1941/42, the 801C was allowed to do that in service? Going to 2700 rpm improves the altitude power by some margin.