| Reason: | FS.RLM Nr. 01238 from 30.7.43
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| | Since the 300 liter tanks are generally not utilized, Colonel Galland suggests drag should be decreased by using a smaller tank.
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| Test Procedure: | Test flights with three different conditions.
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| Results: | The following values are not converted, since air conditions did not change during the test.
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Condition | V mph | V/mph
| smooth machine | 327 | 0
| Mounting bracket without tank | 324 | - 3
| Mounting Bracket with 160 l-Tank | 308 | -19
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| B = 729 mm Hg, t = + 14 °, y = 1,179 kg/m3,
| | p4 = 1,30 ata, p2 = 1,72 ata.
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|   | Tests with an un-faired 300 liter external tank on a Me 109 E/3 (vgl Test Report from 30.7.40) resulted, after conversion to an Me 109 G, in a speed loss of 31 km/h. This calculation is still confirmed by a test. A decrease in size of the tank thus brought no speed gain. A fairing is in the works. A significant improvement is anticipated from this measure.
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| Aircraft: | Me 109-G/5 CN + WF W. Nr. 15562
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| Engine: | DB 605 A W.Nr. 37648
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| Propeller: | 3-fl. VDM adjustable propeller D = 3,0 m Blattbaumuster 9 – 12087
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| Condition of Machine: | Standard production 109 G with smooth camouflage finish, single-wire antenna, tail wheel out, radiator flaps closed.
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| | Augsburg, den 16.8.43 FEV/We/Ka.
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