Quote:
Originally Posted by klem
I am finding that the Merlin engine misfires at the slightest nudge down of the nose, nothing like a nose pushover. This also happens in level flight with some slight movement say due to turbulence or a mere touch of the stick however much I adjust the Mixture.
Can this be correct? We all know the story of negative G and the later Tilly Orifice but would our Fighter Aircraft engines ever have been so susceptible to Negative G that it is impossible to fly them straight and level without them constantly misfiring/puffing black smoke?
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25 seconds in you can see and hear the real behaviour. It's obviously difficult to estimate what the g loads were during the roll, but it looks more like reduced positive than actual negative g to me...
An excellent description of the problem is found on page 5 of this accident report:
http://www.aaib.gov.uk/cms_resources...pdf_501355.pdf
It is important to recognise that the negative g cut is a two stage phenomenon of lean cut possibly followed by rich cut, with the large amount of black smoke in the exhaust being symptomatic of over-fuelling (whether the engine actually cuts out or not is a function of the degree of over fuelling).
You can see this in the video; the smoke starts some time after the aeroplane passes 180º roll angle.
04-03-2011, 10:20 PM
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