Melchior > > Seems that there are two bugs that make the bo105 ASI show > positive speeds when flying backwards: > > 1. YASim delivers a positive "/velocities/airspeed-kt" on backward > flight. > > 2. Systems/pitot.cxx wouldn't handle negative values correctly, > anyway, as it squares the speed without checking for negatives. > > The second is easy to fix, but I have no idea about the first. >
A pitot tube compares the pressure along the _forward_ axis of the tube, caused by forward flight, with the static pressure. I don't think such a device will measure the speed backwards. It is only accurate when the airflow is co-axial with the tube. You need some other device to measure backward velocity. In the only case with which I am familiar (Westland Wessex HAS1 and 3) there was a Doppler radar. Used to get into difficulties over calm seas when attempting an auto-hover IIRC. Vivian ------------------------------------------------------------------------- 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