Re: [Flightgear-devel] Negative-drag-bug in 20 aircraft models

2010-02-23 Thread Andreas-Z
>>I'm currently maintaining the 737-300, and it has this issue as well but I >> wonder if a fix might make the model worse. >> Though it comes much closer to the Vr, it needs plenty of force on the elevator >> to rotate and lift off. And with that bug fixed I fear it will getting worse >> th

Re: [Flightgear-devel] Negative-drag-bug in 20 aircraft models

2010-02-21 Thread Heiko Schulz
Hello Andreas, >A list of the compromised models: >negative Drag >707 >737-300 > >> So each aircraft at a minimum > needs a flight test and possibly some tuning for the fix. > Sure! And of course I wasn't complaining - I thank you > all very much for your work! > If there is something I

Re: [Flightgear-devel] Negative-drag-bug in 20 aircraft models

2010-02-20 Thread Ron Jensen
On Sat, 2010-02-20 at 18:08 +0100, andrea...@gmx.net wrote: > >> just a "quick" fix like this can break an aircraft if it was > "tweaked" to fly correctly with this bug. > Okay... but if a model is tweaked this way, that would mean that the > tweaking only is active when the yoke is pulled back...

Re: [Flightgear-devel] Negative-drag-bug in 20 aircraft models

2010-02-20 Thread Andreas-Z
>>just a "quick" fix like this can break an aircraft if it was "tweaked" to fly correctly with this bug. Okay... but if a model is tweaked this way, that would mean that the tweaking only is active when the yoke is pulled back... so there couldn't be a correct level-flight, which is a more impor

Re: [Flightgear-devel] Negative-drag-bug in 20 aircraft models

2010-02-19 Thread Ron Jensen
On Fri, 2010-02-19 at 08:37 -0700, Ron Jensen wrote: > On Fri, 2010-02-19 at 10:20 +0100, andrea...@gmx.net wrote: > > Hi everyone! > > > > I think I found a little bug in a couple of JSBSim-aircraft: > > The property > > /fdm/jsbsim/aero/coefficient/CDde (Drag_due_to_Elevator_Deflection) > > >

Re: [Flightgear-devel] Negative-drag-bug in 20 aircraft models

2010-02-19 Thread Ron Jensen
On Fri, 2010-02-19 at 10:20 +0100, andrea...@gmx.net wrote: > Hi everyone! > > I think I found a little bug in a couple of JSBSim-aircraft: > The property > /fdm/jsbsim/aero/coefficient/CDde (Drag_due_to_Elevator_Deflection) > > takes negative values when the elevator moves up, so the elevator

Re: [Flightgear-devel] Negative-drag-bug in 20 aircraft models

2010-02-19 Thread jean pellotier
andrea...@gmx.net a écrit : > Hi everyone! > > I think I found a little bug in a couple of JSBSim-aircraft: > The property > /fdm/jsbsim/aero/coefficient/CDde (Drag_due_to_Elevator_Deflection) > takes negative values when the elevator moves up, so the elevator face > is accelerating the plane. >