1. | After replacement of
the engine that failed from supercharger damage, serial No. 328909,
level speeds using combat and take-off power were determined in the
as-delivered condition.
Using the ram pressure calibration as shown in Flight Report Nr 1 the
important points of the speed plots are as follows:
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| Speed at SL with combat power VwKC = 321 mph (516 km/h)
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| " " " take-off power VwKC = 334 mph (537 km/h)
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| Speed at full throttle height with combat power (5650m) VwKC = 366 mph (589 km/h)
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| " "
"
" take-off power (6100m) VwKC = 383 mph (617 km/h)
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| The necessary conditions are fulfilled for a
later comparison and the airplane can be converted to the intended
improved aerodynamic condition.
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2. | Since a modification of the
cowl flaps as well as the cooling air outlet cross-section is also
scheduled with the conversion, the pressures in the engine were
determined during climb and level flights.
The chart of the values obtained in the climb show, that from 6000 m
height upwards the necessary cooling pressure drop as required by BMW for
220° cylinder temperatures is reached only with fully opened cowl flaps.
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3. | For the check of the rearmost
position of the center of gravity for bad weather fighters the machine
was brought, through ballast, to a rear center of gravity with full drop
tank from s = 0.78 ./. 0.76 m . With this the airplane is
significantly unstable and must be flown carefully.
Only after consumption of the fuel supply down to approximately 100
litres for each main fuselage tank, thus a cog-position of 0.72 m, a
sufficient stability around the transverse axis is present.
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| In the case of standard pre-setting of the
horizontal stabilizer of 2° toward nose-heavy (indicated 0) and
neutral elevator trim tab edge resulted in the following trim
indicator positions:
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