USAF C17 Engine backfire

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C17 at the RAAF Richmond Airshow 21st Oct 06.
Watch the inside engine closest to camera at about 27 seconds - BANG!

Channel: People & Blogs
Uploaded: October 22, 2006 at 2:12 am
Author: Sentry30

Length: 00:00:51
Rating: 4.32
Views: 170806

Tags: USAF C17

Video Comments:
jasong19711 (October 4, 2008 at 11:09 pm)
someone in the crowd shitted their panties too!
avxh558 (October 3, 2008 at 11:34 pm)
I can remmber a C-17 doing the same during one of the great RAF Mildenhall air fetes in the uk.
Check out the face book group "bring back the RAF Mildenhall air fete"!
mushmouth1981 (October 3, 2008 at 7:29 am)
Pretty much all types of engines for the military come under a little extra stress and are put to the limit when ur talking bout demo birds. For ex., an engine in a 16 or 15 would of course be under a high stress load frequently if it was a demo bird as opposed to an a/c that is doing normal missions. But all the requirements to maintain servicability of the engines and a/c are being made earlier to keep them preforming. Gotta show our air power.
mushmouth1981 (October 3, 2008 at 7:23 am)
Well as a military jet engine mech, I would say that it puts stress on it backing up but not as much stress on it as it would be trying to stop it going over 200 knots for a landing. I wouldn't say it's bad, it just shortens the amount of "Time On Wing" for those engines. But if that a/c is slotted for doing demonstrations and will be backing up frequently, engine time changes are already forecasted ahead of time.
leechyboy82 (September 27, 2008 at 11:54 am)
the reverse thrust on the c-17 uses the cold stream air. looks like a surge probably caused by a back pressure felt on the LP compressor slowing it down and causing the combustion gases forward very bad thing, £3 million pound engine down the drain.
mushmouth1981 (October 1, 2008 at 7:05 am)
The combustion gases never go forward. All enters the conpressor and exits as advertised when reversing. The C-17 uses it's high fan bypass air (meaning, bypassing the compressor) And is deverted forward via areodynamic blockage (using blocker doors that deploy when the cowl slides back). It damn sure looks like a stall, but definately not due to any back pressure on the compressor. Just a disturbance on in the airflow coming in.
gobuzzrobotics (September 27, 2008 at 2:32 am)
compression stall
agentfazexx (October 2, 2008 at 12:42 am)
How do you know?
hugxer (September 24, 2008 at 12:06 am)
It actually does put more stress on them! That was just a demo of what the jet and its engines are capable of! Nothing more! The engines can hold out if required to but they are designed too be used in combat not to entartain people. If a stunt like that is done a few times in a row the engine(s) might become worn down and require maintenance.
relativeair (September 24, 2008 at 9:01 am)
it really doesn't put a huge mass of stress on them as i said they are designed to take this! ok, yes it puts a little stress on them but it will take many times of performing this before it will need to be serviced!