Hi Josh Josh Babcock writes > >Innis Cunningham wrote: > > > > > > Josh Babcock writes > >> Innis Cunningham wrote: > >>> Hi All > >>> > >>> > >>> Josh Babcock writes > >>>> Jeremy Santizo wrote: > >>>>> can anyone tell me what's pitot heat and if that reallly work on > >> planes? > >>>> Where can I find the procedures for programing the cessna 172's NAV > >> panel > >>>> (in the 2D panel model)? > >>>> Pitot heat prevents pitot tube icing in icing conditions. If that >were > >>>> to happen, the air speed indicator would cease functioning. > >>> More serious than cease to function.It starts to work as an > >> altimetre.I.E > >>> the higher you > >>> fly the faster you appear to go.Resulted in the loss of a 727 some >years > >>> back.Also resulted > >>> in the loss of a commercial jet liner,cant remember what type,when the > >>> static ports were > >>> left taped over after aircraft cleaning.Dont know if the loss of pitot > >> or > >>> static is modelled > >>> in FG > >>> > >> Ah, another reason to have an AoA readout. Those carrier pilots know > >> where it's at. > > > > Well in the case of the 727 they had both the stall warning and the > > overspeed > > warning going off at the same time so what do you beleave.That the stall > > warning > > is correct and lower the nose and risk ripping the aircraft apart with > > overspeed or > > that the ASI is correct and continue to pull the nose up making a worse > > situation > > untill, in a tail engined aircraft,you enter what is called a super >stall > > for which the > > pilot has only one recourse and that is to stick his head between his >legs > > and kiss > > his a---- goodbye.In this case the pilots choose the later which cost >them > > there > > lives. > > > > Cheers > > Innis > > > >I would tend to believe the AoA meter if it matched what my gyro and >eyeballs were telling me. It's hard to get your airspeed that way >though. Is the superstall that you mention a case of flying at full >power on the back side of the lift curve? I have heard stories of GA >planes stuck in that position.
No it occures when the AoA becomes so great as that the wings block airflow over the elevators hence no pitch control so the aircraft falls backwards out of the sky.So serious is the problem that most commercial tail engined aircraft have a stick pusher that lowers the nose when the aircraft is entering a dangerous attitude. With the 727 they actually had the throttles at idle.You would think they would have tweeked that something was wrong that the aircraft was still increasing speed even though they had the throttles at idle and the aircraft in a climb. Cheers Innis _________________________________________________________________ Advertisement: It's simple! Sell your car for just $20 at carsales.com.au http://a.ninemsn.com.au/b.aspx?URL=http%3A%2F%2Fsecure%2Dau%2Eimrworldwide%2Ecom%2Fcgi%2Dbin%2Fa%2Fci%5F450304%2Fet%5F2%2Fcg%5F801577%2Fpi%5F1005244%2Fai%5F838588&_t=757768878&_r=endtext_simple&_m=EXT ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Flightgear-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/flightgear-users
