Newsgroups: sci.aeronautics.airliners Path: news From: megazone@obsidian.WPI.EDU (MegaZone23) Subject: Re: Tire burn-out during landings X-Submission-Date: 28 Dec 1992 03:13:01 GMT References: Message-ID: Approved: kls@ohare.Chicago.COM Organization: WPI USAF -- United Society of Animation Fans Sender: kls@ohare.Chicago.COM X-Submission-Message-Id: <1hlrbtINN5dp@bigboote.WPI.EDU> Date: 28 Dec 92 22:47:43 PST In article Geoff.Miller@Corp.Sun.COM writes: >megazone@obsidian.WPI.EDU (MegaZone23) writes: >>When you spin a tire it acts as a gyroscope and will resists having it's >>course altered. This can make handling tricky as you would have 10 or more >>wheels all spinning on most airliners. >First, I'd think that the mass of the spinning wheels, and therefore the >magnitude of their gyroscopic effect on handling, would be insignificant >compared to the mass of the rest of the airframe and payload and the >power of the control surfaces. That's probably correct, although I don't have the weight of an average wheel and tire on hand to compare it seems so. Though a 26" 12-speed tire is enough to affect my 300lb body, I uspect the ratio of the gear to the aircraft weight is MUCH less... I too feel the major reason is cost, both for the hardware and lifetime costs. >Second, assuming that the effect *was* significant, wouldn't it simply be >a stabilizing influence, i.e., a resistance to changes in attitude about >the longitudinal (roll) axis? That doesn't sound all that hazardous. Arg,old physics comes back to haunt me... Making the large assumption that the mass is significant and the effect is as stated; I can see a few problems in that course correction includes rolling for turns, although I realize the angles used by airliners are a bit less than what I use in a C-172.... But that is just speculation, thinking about it now I would agree that the mass difference makes the gyroscopic effects negligible. ############################################################################### # I have one prejudice, and that is against stupidity. Use your mind, think! # #Email megazone@wpi.wpi.edu Moderator, WPI anime FTP site 130.215.24.1 /anime# ###############################################################################