On mar 11 décembre 2007, dave perry wrote: > gerard robin wrote: SNIP > >> > >> The bleriot is very nice, much nicer than the wright. But its FDM > >> is a bit ... ummm ... well, the engine is quite powerful and the > >> aircraft allows some aerobatics, which the real one probably didn't ;-) > >> > >> m. > > > > About the Bleriot i fully agree with Melchior, the FDM could "make laugh" > > versus the Wright, > > > > However i am sure that somebody, here, very aware with YASim could could > > give to that wonderful plane an FDM which is at the right level ( roll, > > lift, engine power, may be drag). > > I took a look at the bleriot-XI-yasim.xml last night. The dimensions in > this file do not match the .ac file. After some time with google > looking for specifications, I found a few very good sources. The wing > span in the .ac file is for the final configuration, not the channel > crossing configuration. The .ac has the 3 cylinder Anzani engine (rated > 23 - 25 hp on various sites at 1450 rpm). Also the wing incidence in > the specs is 7 degrees which the yasim solver had a lot of trouble > doing. The cruise with this engine was only 36 mph and only 48 with the > 50 hp gnome rotary. I also found the 22 mile channel crossing took 36.5 > min which implies a 47 mph ground speed (10 mph tail wind perhaps). > > Anyway, I was able to get much more realistic performance with some > experimenting using the above data. I am not satisfied yet as I still > cannot get sufficient elevator trim and convergence with the 7 degree > incidence. I should have a satisfying config file by this weekend. > > I don't want to offend the originator of this beautiful model. So I > ask, is it OK to submit a bleriot-XI-yasim.xml file that better matches > the specifications ? > > -Dave Perry > In addition to your research , we may notice that the roll was due to a twist of the wings (no aileron), which probably did not gave the best control.
Cheers -- Gérard http://pagesperso-orange.fr/GRTux/ << Less i work, better i go >> ------------------------------------------------------------------------- SF.Net email is sponsored by: Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
