-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Dave Culp schrieb: > On Sunday 16 April 2006 03:44 pm, Paul Surgeon wrote: >> On other thing I'd like to know is : >> How does one over rev a turbofan engine in real life? >> I know it's not modeled in FG yet but I'm curious as to what actually >> happens in real life to get an over speed problem. > > I have over 14000 hrs in turbines and have only seen one overrev, and that > was > caused by a failed fuel control. These days, with electronic fuel > controllers, overrevs are very rare. BTW, the overrev that happened to me > saw high EGT and about 110% N1. We didn't let it run to failure so I don't > know how long it would last in that condition. I assume the failure mode > would be a turbine wheel disintegration.
Well, I've got 0 hrs in turbines, but had a lecture about aircraft engines (which was mostly jet engines) at university. I remember that some bearings are designed in such a fashion that they break on purpose as soon as the unbalanced mass get's too big. So as soon as a blade breaks (and thus the mass gets unbalanced) the engine stops automatically without causing much harm. IIRC it is even a test that the engine has to pass before it gets certified. CU; Christian -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (MingW32) iD8DBQFERsD5lhWtxOxWNFcRAml0AKCkT3u5hAbZZEM2dsZSfH2PneReNgCeLvNK j5cEuhe6vXILt3/r1kKK550= =HD9B -----END PGP SIGNATURE----- ------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
