The Barten crash report has been posted in the past before. Here it is for reference:
http://www.aaib.dft.gov.uk/cms_resources/dft_avsafety_pdf_501355.pdfThe conclusion was that the left engine unexplicably lost power somewhere near the apex of the wingover. No conclusive proof of the loss of power was determined but the circumstantial evidence suggests that the left carburetor was partly the culprit.
The report theorizes the "bang" heard was related to the rapid reduction of power by the pilot to arrest the left yaw due to assymtric prop effects at the apex of the wing-over. At any rate the left engine lost power going into the apex prior to the "bang".
The video is an example of what happens if you put a plane in a low airspeed situation in an odd orientation. This leads easily to a deeply stalled aircraft because the aircraft easily and very quickly transitions from aoa for normal flight to well beyond critical aoa in a blink of an eye (in this case aoa to 90 degrees relative to the wing in about a second after the peak of the apex). The point is that anytime you're in a low airspeed situation like this in the vertical you can end up deeply stalled --- power failure not withstanding.
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Anytime I see a crash like this I'm horrified by it and always get a lump in my throat knowing that lives were lost.
Tango, XO
412th FS Braunco Mustangs