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Eddie's Zodiac XL Project
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Date: 2-3-2008
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Number of Hours: 2.00
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Manual Reference:
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Brief Description: Flight testing stalls
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Today I went out to test stalls in all configurations, full fuel 66kg, one person 90kg and one bag of sand 80kg onboard.
Power off;
As speed approaches 40 knots indicated, a light buffet is felt through the stick and as the stick is pulled further back the left wing drops and the aircraft starts to auto rotate, as the stick is moved even further back the buffet increases, but rotation speed remains the same. Applying opposite rudder while in this stalled position will actually stop rotation and if held the aircraft will drop its nose and attempt to start flying again. If stick pressure is released at this point the aircraft will immediately start to flying.
Power on 1200rpm to 2200 rpm;
As speed bleeds of with 1200 rpm the buffet is more pronounced and again the left wing will drop and the aircraft will auto rotate. During power on stall tests the aircraft was only allowed to rotate one revolution and again while holding the stick in the stalled position, opposite rudder was applied to see if it remained effective, which it was, and rotation stopped, relaxing pressure on the stick resulted in the aircraft immediately resuming flight.
As speed bleeds off at 2200 rpm, an extremely nose high attitude can be achieved, stall buffet is very pronounced and the aircraft will again commence to auto rotate to the left, recovery is as above with no surprises.
Power off full flap;
As speed bleeds off buffet is very pronounced and the aircraft will rock to the left wing, drop its nose and then rock to the right wing, this rocking motion continues with no tendancy to favor one wing or the other. This again was only carried out for one rotation. Ralaxing stick pressure provides immediate recovery.
The next step will be to try the above again, but allow the rotation to continue to evaluate if rudder remains effective as auto rotation is allowed to develop.
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