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A Physics Lesson: or what you can get away with on television commercials. – part 2 November 6, 2011

Posted by phoenixcomm in Boeing 727, Flight Simulation, Nissan Frontier Commercial.
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Well here we go again….. I found another link to this on Yahoo Answers Is it possible to land a plane like this?

They got most of it wrong… First it’s NOT a DC-9, if you look under the wing there are no engines, and there is one engine in the rear under the rudder, this can only be one, plane the Boeing 727. The best answer was a U2, which has nothing to do with this problem. And then there was the answer about the other Internet video that is amusing but the poor driver should be dead.  And more there was another answer about a CH-53,  also nothing to do with it.  None of them got it right!

FYI… 727s are parked with their rear ramp down, to prevent the nose from rising into the air.

Newsgroups: sci.aeronautics.airliners
From: David L
Subject:A320, MD-80, 727
Date: 01 Dec 93 03:16:29 PSTIn a reply to the question as to why MD-80’s and 727s have their ventral stairs down on the ground: it keeps them from tipping over (tail down) should someone goof in loading them! In the AIAA “Cases Study in Aircraft Design: The Boeing 727”, Mark Gregoire relates a story about when the first 727-200 was delivered to National Airlines. “As it rolled to a stop near the National hanger, amid the expectant dignitaries, the pilot touched the brakes and the airplanes nose went down and then recoiled up and lifted the nose gear off the concrete approximately 6 to 8 inches.
The gasps in the crowd where hear 3,000 miles away in Seattle. Bill Clay put a team together and, armed with weight and balance data, toured the airlines outlining the entire spectrum of configuration control, ground handling, ballasting, and precautionary measures from sloping ramps to heavy snow loads on the tail. As far as we know, no 727-200 has ever sat on its tail and maybe we over reacted the National incident, but that’s why, you will nearly always see a 727 with with its rear airstairs down when parked.”
Newsgroups: sci.aeronautics.airliners
From: Terrell D (bcstec.ca.boeing.com)
Subject:Re: A320, MD-80, 727
Date: 28 Nov 93 16:39:03 PSTTypically it is to keep the airplane from tipping back on its tail. Rear engined airplanes have chronic problems with CG location empty. They have other chronic problems, but I won’t go into that. 🙂
The CG problem stems from having the CG of the empty airplane well aft of the CG of the payload (the passengers and baggage). When summed
together, the CG of the airplane system must be within a relatively small range defined by the stability and control requirements and tail power
available. The landing gear like to be pretty close to the CG of the loaded airplane in order to allow easy rotation at takeoff. So, when the
airplane is NOT loaded, the CG moves aft – very close to the main gear – and someone walking around in the back, or loading cargo into the aft
cargo compartment, can easily cause the airplane to tip back.
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Comments»

1. Courtney L - July 14, 2013

The plane in the video IS a 727, but the statement that it is not a DC-9 because it does not have engines under the wings is inaccurate. The DC-9 has two engines tail mounted. The DC-8 and DC-10 have engines under the wings.


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