Hi Georg, Georg Vollnhals schrieb am 30.07.2007 23:49: > Hi Maik, > > after creating a new build (OSG CVS) and downloading new data I made > several testflights. > > The new build might have changed the behaviour a little, now I get the > correct pedal-response *very* groundnear (groundeffect?), going upwards > there is a small zone where I get no reliable effect and a little higher > I have the inverted pedal-response. > Yes, I get the same here. I think it is related to the collective position. The rudder function is done by different pitching (cyclic) of the two rotors. In the simulation this has only a small effect, therefore I need large input to the cyclic. With maximum collective the blades are near the stall incidence. With increased incidence by the rudder-function, the rotor stalls partly. This reduces the lift where increased lift is wanted. Therefore an inverted effect is visible. I need to optimize the rotor parameter further. Unfortunately I have neither drag/lift curves of the used airfoils nor information about the cyclic/collective range. I only have information about the blade geometry, 47.5 degree twist (!). Therefore I need to do some more trial and error. > After several trials (and crashes) I got a little used to this and made > it through the transition into forward flight. Here I have the same > strange effect that pressing left pedal tilts the aircraft to the right > (longitudinal axis) and right pedal press tilts it to the left (a normal > aircraft would tilt to the left when pressing left pedal and moving > siderudder to the left). > I think I have the same effect here. The rudder has large negative effect on the aileron-axis. I will try to find the root cause for this and reduce this effect. > By the way, it was then really nice to land, slowing down and pitching > the rotors back step for step without knowing the exact speeds and > procedure-steps (got a very smooth landing with -10 deg). > > You can set the engine-tilt to vertical at every speed you like. The flight computer limits the actual tilt depending on the aircrafts speed. And you can set it to horizontal flight on ground, do a short take off and convert to horizontal mode a few seconds after lift off. > This is just a report, nothing more. If it is working fine for you and > Emmanuel then it might be something strange due to my local copy. > Thank you very much for pointing out these bugs! > Would be fine if other developers/users give further feedback. > > At last, this is a very, very fascinating FG aircraft from all aspects > and this was not my last flight, I will ignore my old "pedal-habits" :-) > Thank you very much both Emmanuel and Maik for your work. > I am sure we get the V22 to correct pedal-habits. :-)
By investigating these effects I found out that my local modifications have noticeable effect on the aircrafts performance (the code in cvs does one 1st order approximation which is not valid for the highly twisted blades of the v22. I sent a diff to Andy). > Regards > Georg > > Maik ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
