| 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.
|
|
Gills.
|
|
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.
|
|
