Yes! > -----Original Message----- > From: dave perry [mailto:[EMAIL PROTECTED] > Sent: Monday, December 08, 2008 6:21 PM > To: FlightGear developers discussions > Subject: Re: [Flightgear-devel] c172p pitch at cruise question > > Jon S. Berndt wrote: > > The JSBSim C172 FDM assumes the thrust line is the X axis. I'm not > sure what the angle of incidence of the wing is, but it seems that at > rest on the runway the pitch of the C172 should be 5 degrees, according > to the picture you attached. > > > > Jon > > > > > But as others have pointed out, this attitude should be determined by > the modeling of the main gear flex and nose strut compression. The 3D > model should be such such that when the FDM calls for 0 degrees pitch, > the 3D model does not need any pitch rotation. If the modeller tries > to > achieve the attitude that a taxiing AC would have (e.g. 5 degrees > pitch) > in blender or ac3d, then the AC will have that 5 degrees pitch when the > FDM is calling for 0 degrees. > > Dave P. > > > >> -----Original Message----- > >> From: Heiko Schulz [mailto:[EMAIL PROTECTED] > >> Sent: Monday, December 08, 2008 12:16 PM > >> To: FlightGear developers discussions > >> Subject: Re: [Flightgear-devel] c172p pitch at cruise question > >> > >> Hi, > >> > >> I had today a closer look into this issue. > >> > >> I got a drawing of the OM of a c172 which shows the the pitch angle > >> with compressed nose gear. > >> I tried to rotate the model but then I found something which shows > me > >> that the problem lies on the fdm: at cruise speed about 100kias I > got a > >> pitch about 0.3- 0.55 degres. > >> Myself and some others in IRC-Chat noticed that the model is hardly > to > >> steer on the ground and lift of itself without touching the controls > or > >> the trim. I don't know, but could it be that the cg of the aircraft > >> isn't right which makes all these? > >> > >> Attached the drawing from the OM. > >> > >> Cheers > >> HHS > >> > >> > >> > >> > >> > >> > > > > > > > > > ----------------------------------------------------------------------- > ------- > SF.Net email is Sponsored by MIX09, March 18-20, 2009 in Las Vegas, > Nevada. > The future of the web can't happen without you. Join us at MIX09 to > help > pave the way to the Next Web now. Learn more and register at > http://ad.doubleclick.net/clk;208669438;13503038;i?http://2009.visitmix > .com/ > _______________________________________________ > Flightgear-devel mailing list > Flightgear-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/flightgear-devel
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