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#1
01-30-2012, 07:51 PM
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Tha A9 used 1.65 + C3 injection-> 1.78Ata
Several staffels flew the A7/8 with a D2 with the same settings without any pb's (jg300+301) beeing monitored by FW factory. The A5 1.65ata on the 2 blower's stages flew, just as the A6/7/8. here some info from a very "knowledgable" person working with a real 190: "Increasing Knock Limited Performance in the BMW801D2 Part 1 Throughout the war, the BMW801D2 was continually developed to keep pace with the performance of the allied fighters faced by the FW-190 equipped Geschwaders. The engine became a reliable workhorse and made the FW-190 one of the best performing low altitude fighters of the war. It began its design lifecycle with a top shaft output of 1670PS at Start u Notleistung at 1st Gear supercharger full throttle height and gained 150 PS by wars end at the same settings. Additional boost systems raised this power output to over 2100PS. The BMW801D2 was developed to the limits of its potential and even beyond a point when other motors such as the BMW802 showed greater promise for a similar effort. The Achilles heel however continued to be high altitude performance. This article in two parts will discuss the 4 major systems used to increase knock-limited performance in the BMW801D2 above the engines normal Start u Notleistung rating. --------------------------------------------------------------------------- In June of 1942 BMW completed a theoretical investigation in the potential development of the motor. Without any major change to the motor it was possible to increase shaft power output at full throttle height by 40PS at Start u Notleistung and 110PS at Steig u Kampfleistung. With some major changes it was possible to get a shaft output of 2000PS without additional knock limiting performance enhancements. It was determined that the motor had the potential for developing between 2000PS-2200PS by injection of knock limiting agents such as water or alcohol water mixtures. Work began immediately on putting the theory into practice. Prototype motors were constructed and work began on improving the power output of the motor at all levels. By July 1942 BMW had constructed several prototype motors to begin laboratory bench testing. BMW801D2V15 achieved 1950PS shaft output without ram or knock limiting performance enhancements during this phase. In the quest for attaining the full potential of the BMW801D2 three knock limiting agent injection systems and one method of oxygen enrichment of the charge were shown to be practical or worthy of further investigation. ---------------------------------------------------------------------------- C3-Einspritzung, The Bomber and Attack Pilots Insurance The first system to see operational adoption was the injection of C3 fuel as a knock limiting agent directly into the left side of the supercharger intake. Motors were modified with stronger pistons adopted from the BMW801E/S development. These new pistons became the production standard on all BMW801D series motors in June 1943. On the 10th of April 1943 the first flight testing of the new system began with a 25-minute flight in the low altitude portion of the 1st gear supercharger and resulted in 8 minutes of the systems use. By the 22nd of April 1943 test flights were using the system as long as 15 minutes and at manifold pressures as high as 1.8ata between 3.5km and 7km altitude. Initial flight-testing was completed on the 17th of May 1943. The flight test results concluded however that the system produced 2050PS in the 1st Gear Supercharger and that a manifold pressure of 1.65ata could be used reliably. As the pressure fell off with altitude however, the standard fuel pump was not able to provide sufficient quantities of fuel to allow the system to develop additional power in the 2nd Gear Supercharger. The engine cooling was also not sufficient enough for the system to be used in climbing flight. The fuel pump could not deliver enough fuel to the left hand supercharger intake to keep cylinder temperatures within operational limits at climbing speeds. It was felt that a further 50PS of thrust power could be gained by changing the propeller reduction gearing to a more suitable ratio in order to fully exploit the new power gains of the motor. The initial testing was completed and the findings compiled by the 19th of July 1943. It is interesting to note that JG54 begins reporting experience with the new system in 23 July 1943." And a personnal question TO FatCat : has the radiator drag penalty been changed/removed/minimized for the Anton family in the patch? 
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#2
01-31-2012, 05:26 PM
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#3
01-31-2012, 07:03 PM
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 oh man, i'm so disapointed you didn't add your touch on this one ooooh FRACK about the drag penalty for rads on Anton's , maybe for the next patch  Will try to get some RL data from real specialists.
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#5
01-31-2012, 08:23 PM
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"Kurt Tank's cowl completely enclosed the engine. Cooling air was admitted through a hole in the front of an oversized propeller spinner; a cone in the middle of the hole was intended to compress the air, allowing the small opening to create sufficient airflow. In theory, the tight-fitting cowling also provided some thrust due to the compression and heating of air as it flowed through the cowling." It does have a complex oil cooling system that runs around the inside of the forwards cowling housing though. . Last edited by KG26_Alpha; 01-31-2012 at 08:37 PM.
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#7
01-31-2012, 08:42 PM
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The BMW-engined Fw 19Os had an engine-driven fan to increase airflow through the cowling. Presumably this must have taken some power to drive, and I could just about imagine the back pressure from a fully-closed cowl actually reducing available power - though whether this would be significant is hard to tell.
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MoBo: Asus Sabertooth X58. CPU: Intel i7 950 Quad Core 3.06Ghz overclocked to 3.80Ghz. RAM: 12 GB Corsair DDR3 (1600).
GPU: XFX 6970 2GB. PSU: 1000W Corsair. SSD: 128 GB. HDD:1 TB SATA 2. OS: Win 7 Home Premium 64bit. Case: Antec Three Hundred. Monitor: 24" Samsung. Head tracking: TrackIR 5. Sore neck: See previous. 
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#8
01-31-2012, 08:58 PM
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Last edited by KG26_Alpha; 01-31-2012 at 10:12 PM.
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Hybrid Mode
