| Condition: |
| Enginer Jumo 213 A/1021521862 |
| D-9 series condition with methanol equipment |
| Methanol nozzle for 160 L/H throughput with 0.45 atü |
| Surface primed and polished |
| All gaps at the engine and the transitions carefully sealed with rubber. |
| Armament: 2 Mg 131, 2 MG 151 |
| Operable landing gear doors. |
| Non-powered radiator flap in front of the air intake fixed in flush position. |
| Radiator flap adjustment equipment attached to the propeller oil circulation. |
| Rücklauföl zum Sauganschl. des Luftschraubenreglers geführt. |
| Stromlinienverkleidung für Bildgeräte Schrägeinbau an der linken Rumpfseitenwand. |
| Program: |
| 1. | Determination of the gain in speed in flight, with increased Take-off and Special Emergency Power, by seals at the engine gap. |
| 2. | Check of the flight characteristics with Verkleidung für Bildgeräte Schrägeinbau. |
| Results: |
| 1. | As delivered, substantial gaps were present at the engine, in particular in the transition from the cowl to the wing.
In order to check for their influence on level speeds, performance comparison flights were carried out in the low supercharger range,
before and after sealing of all existing gaps. |
| After conclusion of the trials in the initial condition, an even gap width at the transition from the cowl to the wing had to be
ensured, first by shifting of the lower engine cover against the propeller direction of rotation, since substantial differences arose by the engine torque in flight.
Then the sealing of the fairing was made by means of rubber gaskets and metal strips. |
| The enclosed speed graph shows level flight performance with Increased Take-off power (1900 HP - basis) and Special- Emergency power.
As evident, a gain in speed of 13 to 15 km/h is obtained by the gap sealing. Level speeds at Sea Level: |
|
| Without gap sealing: |
Take-off power
Increased power
Special Emergency Power |
VwKC = 346 mph
VwKC = 357 mph
VwKC = 370 mph |
| With gap sealing: |
Take-off power
Increased power
Special Emergency Power |
VwKC = -
VwKC = 366 mph
VwKC = 378 mph |
| During these flights the seals between engine and wings pulled out and then were torn off.
It was also noticed that exhaust gases caused minor fire in spots.
Therefore, an improvement of the sealing within this area is necessary. |
| 2. | Bei Start und Landung sowie im normalen Horizontalflug ist durch den Bildgerätetropfen an der linken Rumpfseitenwandkeine Beeinträchtigung des Abkippverhaltens im Geradeaus- und Kurvenflug unterblieb zunächst,
da das Flugzeug infolge abgerissener Strahl düsen aus dem Flugbetrieb gezogen werden musste. |
| The Bildgerätescheibe remained completely free from soot and oil for static test and in flight (despite heavily oiling engine). |
Langenhagen, 24 October 1944
Gt/Schw. |
|
