[AR] Re: 737-MAX

  • From: J Farmer <jfarmer@xxxxxxxxxxxxx>
  • To: arocket@xxxxxxxxxxxxx
  • Date: Thu, 6 Jun 2019 15:44:12 -0400

On 6/6/2019 2:21 PM, Henry Spencer wrote:

If this sounds peculiar to folks not familiar with the airplane, the problem is that the original 737 was a 1960s design using 1960s engines. The engines were long and slim, and they were tucked right up under the wing rather than extended down on pylons.  The result is an airplane that sits pretty low, which was convenient for extending jet service to smaller airports that were equipped only for old, small propeller aircraft.

The downside of this is that there just isn't a whole lot of room between the wing and the ground.  This has caused increasing difficulties with accommodating bigger engines for stretched versions of the 737, especially given that modern turbofan engines are dominated by honking big fan stages and thus are short and wide.

Yeah, if I recall correctly, Boeing engineers floated a design with a new wing but it was shot down as A. to expensive, B. wouldn't be accepted as a STC to the original certificate, and C. required retraining of the flight, operations, and maintenance crews.  Not sure it would have been a better plane, but the combinations of the above killed it.

There were some sketches around that modded the front of the wing to allow the fan stages to intrude into it, but that added more complexity, paperwork, expense, etc. for what was viewed as slight gain.

John


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