Short term options for a performance increase of the Fw 190 with 801 D
through engine modifications based on the status of March 1944. |
1.) | Explanations for the chart: Altitude performance 801 D and F (page 2 and annex) |
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2.) | Performance gains and conditions of usage for engine performance increases for various operational cases for the Fw 190 | |
A) | as fighter bomber (page 3) | |
B) | as tactical support (page 4) | |
C) | as fighter (page 4) I. boost increase II. GM I |
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(Basis for engine data: internal operating instruction BMW JB Nr. 3064) |
1.) | Explanations for the chart: "Altitude performance 801 D and F". | |
(chart see annex) | ||
Blue line: | Normal 801 D, climb and combat power |
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Red dotted line: | 801 D take off and emergency power. The possible hp-gains resulting from the boost increase from 1.42 ata to 1.58 ata in first charger gear and 1.65 ata in second charger gear are the red areas. |
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Green dotted line: | This line shows a power boost resulting from the methanol injection, which was planned previously but not realized by BMW for the 801 D. | |
Yellow and brown line: | Climb and combat, and takeoff and emergency power for the 801 F engine. | |
A comparative assessment of the plots
shows that the performance gain of the 801 D through the increased
boost is the most remarkable, but that the 801 F engine still has to be
required with the highest level of urgency. This is even more so, since BMW intents a power increase similar to the one on the D-engine through increased boost and methanol injection for the F-engine (letter of BMW to Focke-Wulf dated 8.2.44). |
2.) | Performance gains and conditions of usage for engine performance increases for various operational cases for the Fw 190 | |||
Operational case | ||||
A. Long range fighter bomber | ||||
Boost increase from 1.42 ata to 1.65 ata Simultaneously C3-injection 65 l/min |
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(Usage of increased emergency power prohibited in second charger gear) |
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Usage: | 3 x 10 min per mission with 10 min cooldown at combat power. | |||
Performance gain: | (see shaded areas in plot below) | |||
Availability: | to be installed continuously by A.A.. Parts available. | |||
B. Tactical support | ||||
Same as longe range fighter bomber! | ||||
C. Fighter | ||||
I. | Boost increase | |||
Values not yet approved by Rechlin at the moment. | ||||
Boost increase from 1.42 to | ||||
1.58 in first charger gear 1.65 in second charger gear |
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No C3 injection! | ||||
Usage: | ||||
At all altitudes in level flight and climbs 10 min permitted. In climbs limit use if possible. | ||||
Performance gain: | ||||
a) | Speed: | |||
b) | Climb performance: | |||
The considerable total gain (shaded area) comes from 2 factors: | ||||
a) | from 2400 to 2700 revolutions | |||
b) | at 2700 increased boost with 10 min usage (not for climbs from sea level to ceiling!) | |||
Availability: | ||||
Venting tubes and blinds available from BMW from March onwards | ||||
II. | GM I | |||
Usage about 20 min at altitudes above 8000 m at 80 gr/s. | ||||
a) Climb gain: | ||||
b) Speed gain: | ||||
Availability: | ||||
GM 1-installation possible from Fw 190 A-8 onwards. Factory supply starting April 1944, limited to Ago Supply of GM 1 kits still open, negotiations RLM - Braunschweig |
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Eilsen, 15.3.1944 |