From: email@example.com (Terrell D. Drinkard) Organization: Boeing Commercial Airplane Group Date: 11 Feb 94 03:55:05 PST References: 1 2 3 4
View raw article or MIME structure
In article <firstname.lastname@example.org>, Gregory R. TRAVIS <email@example.com> wrote: >In <airliners.1994.918@orchard.Chicago.COM> firstname.lastname@example.org writes: > >>c) Overly strong fuelage and wing construction (Comet legacy) so lots of >> weight ahead of the main wheels. > >Comet legacy? I distinctly remember several Comets coming apart in >mid-air. Or are you saying that the redesigned Comets were over-engineered >to avoid embarassment? I rather doubt that the Comets are over-engineered for their time, the 1950s. Granted, they missed the stress buildup around the window holes and forgot to put in a flange to give themselves more area (P/A you know), but the big issue in that time, IMHO, was fatigue life vs weight (come to think of it, that is still a big issue driving gobs of materials work). Look at the DC-8 and the 707, and the Lockheed Electra, all designed in that same era with essentially the same alloys. Tremendously long lives. >>d) 90% + of payload located ahead of main wheels (I think that's about right). > >Is this true? How the heck do you rotate, or flare, a VC10? I find >this hard to believe, considering they have four aft-mounted engines! Um, I don't think so either. Typically, you'll find the main gear a few tens of inches behind the aft CG limit. Therefore, you shouldn't expect more than 55% of the airplane's weight in front of the main gear. But, after another millisecond's thought, I note that julian wrote 90% of the PAYLOAD is forward of the gear. Not that I agree with that either, even Douglas puts less than 70% in front of the mains. That number is eyeballed, by the way, and is strictly my uninformed opinion, your mileage may vary. Karl probably has better numbers than I do. Terry -- Terry email@example.com "Anyone who thinks they can hold the company responsible for what I say has more lawyers than sense."