Hello Airliners.net Friends:
I hope this is in the right forum. Anyway, I have a couple of questions today regarding thrust reversers. I remember reading somewhere that pilots rarely use their aircraft's thrust reversers below around 60-70 knots because this relatively low speed does not allow enough fresh air to get to and enter the aircraft's engines. If this is true, how does a DC-9 performing a power back circumnavigate this problem? I would have thought that a turbojet engine would be even more susceptible to this problem compared to a turbofan engine seeing as turbojets derive most of their thrust from the combustion of fuel in their cores.
I was also wondering about the use of thrust reversers on long/rear mounted engines/T-tailed aircraft during landing. Is it theoretically possible that a combination of large amounts of reverse thrust and a nose pitched up for the landing flare cause an airplane to tilt backwards, resulting in a tail strike? It seems like it would be possible, considering how far behind the main wheels the engines of, say, a MD-90 are.
Thanks in advance!