Bill Miller
Filing Flight Plan
- Joined
- Jun 10, 2016
- Messages
- 7
- Display Name
Display name:
NavalAV8r
The video clearly shows the shadow of the plane coming in from the top of the frame, across the propane tanks. At 1 pm CDT, at Hobby, the sun was at "altitude" 87.7 degrees, azimuth 157.0
If you watch the silhouette the shadow is almost aligned with the sun(the tail is aligned with the fuselage in the video). This typically corresponds to a post stall gyration when the pilot is pulling full aft stick. Most of us have never seen the visual ground rush that causes this pilot reaction, except in a simulator. At the stall, the (longitudinal) dynamic stability causes a rapid pitch down as the plane is trying to fly, despite the elevator input. Usually a sequence of post stall gyrations occurs as the spin develops, first in pitch, and then in roll. I suspect the initial shadow in the video the plane has reached the maximum pitch down(past the vertical based on landing gear shadow) and then, as the shadow is crossing the white concrete parking lot, the nose has started to oscillate(pitch) back upwards and this is confirmed when the plane comes into view with the pitch rate continuing upwards, a classic post stall gyration pattern, with the roll.
It appears that the wings are not rotating initially, but then the rotation starts as the shadow crosses the parking lot towards the car. That turn is about 130 degrees. You can see the landing gear shadow in the early frames indicating the plane was still not rolling at that point. The left roll is consistent with what we call P-factor with an engine at high power settings, but this is less certain, but may be determined by further video analysis which could reveal the RPM of the prop(notice the apparent curvature of the prop shadow caused by the video scan pattern). The engine power setting and state will be revealed by the engine tear down and analysis next week, as well.
This is all consistent with post stall gyrations developing to incipient spin from an altitude of 300-500 feet when it started, presumably after the 4th missed approach to 35 or 4. We did thousands of spins in the USN during the F-14 top-gun area when we needed to train F-4 pilots to recognize spins, and later at the Test Pilot School. I have since been an advocate for spin and upset training for all pilots. I recommend this course. Its fun and will enhance your safety. If you need a good argument, say that safety is the requirement, that you must rent that aerobatic trainer!
If you watch the silhouette the shadow is almost aligned with the sun(the tail is aligned with the fuselage in the video). This typically corresponds to a post stall gyration when the pilot is pulling full aft stick. Most of us have never seen the visual ground rush that causes this pilot reaction, except in a simulator. At the stall, the (longitudinal) dynamic stability causes a rapid pitch down as the plane is trying to fly, despite the elevator input. Usually a sequence of post stall gyrations occurs as the spin develops, first in pitch, and then in roll. I suspect the initial shadow in the video the plane has reached the maximum pitch down(past the vertical based on landing gear shadow) and then, as the shadow is crossing the white concrete parking lot, the nose has started to oscillate(pitch) back upwards and this is confirmed when the plane comes into view with the pitch rate continuing upwards, a classic post stall gyration pattern, with the roll.
It appears that the wings are not rotating initially, but then the rotation starts as the shadow crosses the parking lot towards the car. That turn is about 130 degrees. You can see the landing gear shadow in the early frames indicating the plane was still not rolling at that point. The left roll is consistent with what we call P-factor with an engine at high power settings, but this is less certain, but may be determined by further video analysis which could reveal the RPM of the prop(notice the apparent curvature of the prop shadow caused by the video scan pattern). The engine power setting and state will be revealed by the engine tear down and analysis next week, as well.
This is all consistent with post stall gyrations developing to incipient spin from an altitude of 300-500 feet when it started, presumably after the 4th missed approach to 35 or 4. We did thousands of spins in the USN during the F-14 top-gun area when we needed to train F-4 pilots to recognize spins, and later at the Test Pilot School. I have since been an advocate for spin and upset training for all pilots. I recommend this course. Its fun and will enhance your safety. If you need a good argument, say that safety is the requirement, that you must rent that aerobatic trainer!