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#21
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10 Points to Bob, who got it first
![]() Merry Christmas everyone. "Cockpit Colin" wrote in message ... For what it's worth, a 757 at ground idle produces around 3000 pounds thrust per engine - you can back them using the reversers, but you can't go full power as the re-ingest the exhaust gasses. And when you're backing you must always use forward thrust to stop, and not the brakes - anyone guess why? "Ramapriya" wrote in message oups.com... I know that a car's engine needs to be mated to the transmission for propulsion. This I know isn't the case with an aircraft with a jet engine; if the engine is turned on without the brakes applied, the jet of air leaving the engine will hurl the craft forward. My doubt is, why does this forward motion effect not occur during push-back, when the engines are normally turned on? Is it because at low revs the engine would lack the punch to initiate the forward motion of a heavy aircraft? If not, I'd imagine the push-back becomes a bit of a tiresome affair by the time it's over... Sorry if this is infuriatingly elementary, but I need to ask somewhere ![]() Ramapriya |
#22
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![]() "Cockpit Colin" wrote in message ... 10 Points to Bob, who got it first ![]() Merry Christmas everyone. Tail strike was my first thought only because I did it in my TriPacer when a friend got over zealous pushing me back into a tiedown. We had just got back from OSH and the back seat & cargo was full of gear tho. ;-) Merry X-Mas to all, Marty |
#23
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Never seen jets do this. I have seen turboprops do it at one airport
(Southhampton UK). I would think airport ops would be worried about loose tools, articles debris (like ramp agents) getting thrown through the terminal's picture windows if heavier aircraft start doing this! G Faris "Jay Beckman" wrote in message news:3buyd.350$yW5.320@fed1read02... "Ramapriya" wrote in message oups.com... I know that a car's engine needs to be mated to the transmission for propulsion. This I know isn't the case with an aircraft with a jet engine; if the engine is turned on without the brakes applied, the jet of air leaving the engine will hurl the craft forward. My doubt is, why does this forward motion effect not occur during push-back, when the engines are normally turned on? Is it because at low revs the engine would lack the punch to initiate the forward motion of a heavy aircraft? If not, I'd imagine the push-back becomes a bit of a tiresome affair by the time it's over... Sorry if this is infuriatingly elementary, but I need to ask somewhere ![]() Ramapriya Sometimes they don't even need a tug to get away from the gate... I've been on American Airlines MD80s that have pushed back under their own power via their reversers. Jay Beckman PP-ASEL Chandler, AZ |
#24
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"Greg Faris" wrote
Never seen jets do this. I have seen turboprops do it at one airport (Southhampton UK). I would think airport ops would be worried about loose tools, articles debris (like ramp agents) getting thrown through the terminal's picture windows if heavier aircraft start doing this! Yes...here in the US, the FAA grants permission for "Power-Back" operations at specific gates and specific aircraft. Pilots receive special training before they are allowed to conduct Power-Back operations. I did Power-Back operations in B-727 a/c. Bob Moore ATP B-707 B-727 PanAm (retired) |
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