Am Dienstag, den 25.12.2007, 22:24 +0100 schrieb R. van Steenbergen: > gerard robin schreef: > > With an aircraft which has gears retractable , the "landing" on sea can be > > done smoothly on the belly. > > TableData "drag" (and "lift") can be given with the best values according > > to the water reaction. > > The values regarding landing on ground remains right. > > We have, only, to select the right TableData according to terrain type, > > which is easy to do. > > > The possibility of belly landing an aircraft depends on the aircraft > type -- an A/C with underwing mounted engines and a low wing is > impossible to make a graceful belly-ditch (like the 737) since the > engines would scoop up all the water and cause a huge amount of drag > (and pitch the nose forward).
In this case the pilot approaches the water with a slight bank, so only one engines hits the water. The drag will cause the aircraft to make a strong yaw-movement, thereby loosing speed and reducing the tendency to dive nose over. This is a standard procedure for emergency landing and has been successfully (without loss of lives) conducted in the past. > IMO, the aircraft's fuselage, engines, and > wings could also be considered contact points, albeit higher situated > than an extended landing gear. For example, when you land a 737 or 747 > over its recommended landing weight, you run the risk of either breaking > the gear struts or causing enough gear compression to impact the engines > on the runway. And of course, belly-landing an A/C on tarmac or grass is > just as possible as ditching on water, but those methods could only be > considered in an extreme emergency (like a jammed landing gear). Even > MSFS can be fooled into doing it: I once bellied a Learjet 45 on the > runway at Malaga in FS2004, only noticing that I made a fuselage landing > when I tried to taxi off the runway and the aircraft didn't move (and I > switched to external camera, realizing I forgot to lower the gear before > landing. Next time: THREE GREENS! :)) > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by: Microsoft > Defy all challenges. Microsoft(R) Visual Studio 2005. > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ > _______________________________________________ > Flightgear-devel mailing list > Flightgear-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/flightgear-devel ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
