Flight Report Fw 190/669 Fighter Bomber
Nr. 1
Werk Flughafen 

Date: Take-off: Landing: Duration Pilot: Flight Nr.:
19.10. 1609 1616   7' Bartsch   9
19.10. 1641 1659 18' Bartsch 10
20.10. 1600 1605   5' Melhorn 11
22.10. 1440 1515 35' Sander 12

Condition: Fighter bomber
Engine BMW 801 D2/25543 unthrottled
Tight engine cowl.
Armament: 2 MG 17, two MG 151 without ammunition.
ETC 501 with intermediate rack without bomb.
Wing racks for fuel tanks (unfaired)
Take-off weight with auxiliary tank (empty) G = 8,378 lbs. (3800 kg.) s = 0.715 m
Take-off weight without auxiliary tank G = 8,281 lbs. (3756 kg.) s = 0.718 m

Program: 1.) Check the flight characteristics about the longitudinal axis with or without an empty auxiliary tank.
2.) Determination of aircraft performance.

1.) After the flight characteristics about the longitudinal axis in flights without auxiliary tanks were brought to order by adjusting the ailerons, flights were conducted with two auxiliary tanks. This revealed that the aircraft started to buffet from va = 180 mph (290 km/h) up, while the ailerons performed small motions around their axis of rotation.
The disturbance in the stick increased with increasing ram pressure, so that no faster than va = 298 mph (480 km/h) could be flown. By observing the auxiliary tank-view rods it was found that the tanks remained still, therefore they were themselves not the cause of the shaking of the aircraft.
It must now be determined whether the shaking can be eliminated by an appropriate fairing for the auxiliary tank rank.
2.) A speed of 255 mph (410 km/h) at sea level (0 m), was obtained in level flight at combat power, without bombs and with two empty auxiliary tanks. A further decrease in speed of 19 - 20 mph (30 – 32 km/h) is expected in case of operations with 1,102 lbs (500 kg) or 551 lbs (250 kg) bombs.

Wenzendorf, 6 November 1942

Remark: Because the disturbances of the flight characteristics are indicative of vortex formation in the vicinity of the tank racks, it can be assumed that after the elimination of mentioned disturbances, the speeds would be significantly improved.

Level flight performance


Flugbericht Fw 190/669 Nr. 1 (pdf)

Translation by Jörn Dietrich and Mike Williams

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