Re: [Flightgear-devel] CPRC Autonomous UAV Helicopter
Hello Thomas, Thomas Hamilton schrieb am 15.05.2010 23:07: > >Maybe it's easier > >if you just provide a (maybe very simple but right size) 3d Model of > >your helicopter. Then I can make a FDM similar to my rc-helicopters. At > >the end we only need to adjust it to make it fly as your helicopter does. > We are going to wait a few days to see if the manufacturer will > provide us with a model. After that we will start the process of > measuring dimensions and writing a model right. What format is most > convenient for you? I just need a 3D-model working in flightgear. I will create the xml file describing the fdm. > If it is at all possible, we would like to learn how you are able > to get the values of the parameters. In principle its very easy. Most of the parameters can be measured directly or are defined by the airfoil. For the remaining parameters I will guess some values and adjust them to get the heli reacting as I expect it to react. ;-) By the way: I have an adapter for the rc-helicopter simulator called reflex. Has anyone a driver for using this adapter with Flightgear on Win-XP? > Thanks. Regards, Maik -- ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] CPRC Autonomous UAV Helicopter
>Maybe it's easier >if you just provide a (maybe very simple but right size) 3d Model of >your helicopter. Then I can make a FDM similar to my rc-helicopters. At >the end we only need to adjust it to make it fly as your helicopter does. We are going to wait a few days to see if the manufacturer will provide us with a model. After that we will start the process of measuring dimensions and writing a model right. What format is most convenient for you? If it is at all possible, we would like to learn how you are able to get the values of the parameters. Thanks. -- ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] CPRC Autonomous UAV Helicopter
Hello Thomas, Thomas Hamilton schrieb am 08.05.2010 04:03: > > >Maybe it's easier > >if you just provide a (maybe very simple but right size) 3d Model of > >your helicopter. Then I can make a FDM similar to my rc-helicopters. At > >the end we only need to adjust it to make it fly as your helicopter does. > I can do this without too much work, maybe it would be less work > for both of us though, if I just sent relevant dimensions and > specifications. > I was rather hoping that I would be able to do this myself > though. Is there any more documentation on this subject besides the > readme included in the installation? The meanings of some of the > flags and parameters are not very clear to me; and a few are > altogether missing. My team is going to be changing gear around and > rebuilding the vehicle several times, so it is necessary for us to > learn eventually. No, there is no additional documentation, only the readme and the .xls file for the airfoil parameters. If we have a working FDM the tuning need only modification of very few parameters. Therefore I am sure, that modifications on the "real" helicopter can be adjusted in the .xml file by your team. > > thanks again, > Thomas Best regards, Maik -- ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] CPRC Autonomous UAV Helicopter
>have no idea, if or when helijah will commit my patch. Maybe it's easier >if you just provide a (maybe very simple but right size) 3d Model of >your helicopter. Then I can make a FDM similar to my rc-helicopters. At >the end we only need to adjust it to make it fly as your helicopter does. I can do this without too much work, maybe it would be less work for both of us though, if I just sent relevant dimensions and specifications. I was rather hoping that I would be able to do this myself though. Is there any more documentation on this subject besides the readme included in the installation? The meanings of some of the flags and parameters are not very clear to me; and a few are altogether missing. My team is going to be changing gear around and rebuilding the vehicle several times, so it is necessary for us to learn eventually. thanks again, Thomas -- ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] CPRC Autonomous UAV Helicopter
Hello Thomas, Thomas Hamilton schrieb am 05.05.2010 19:57: > Thank you for the response Maik, > > >I am sure your helicopter has flapping. Maybe not a visible flapping > >hinge, but some elasticity within the blades or the blade holder. The > >Bo105 and the Ec135 has no flapping hinge as well. > I gather then, that we need to somehow measure effective values for > all of the parameters that aren't obvious? > How would you recommend measuring or calculating the effective flap > hinge ratio? > For the flap hinge I would use the value which is used at the bo105. Up to now there is no example of a helicopter with a bell-hiller rotor head for flightgear. The UH1 has the bell rotor head with stabilizer bar, but as far I know the cvs version of the uh1 is broken since some days. I have no idea, if or when helijah will commit my patch. Maybe it's easier if you just provide a (maybe very simple but right size) 3d Model of your helicopter. Then I can make a FDM similar to my rc-helicopters. At the end we only need to adjust it to make it fly as your helicopter does. > Thanks again, > Thomas Best regards, Maik -- ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] CPRC Autonomous UAV Helicopter
Thank you for the response Maik, >I am sure your helicopter has flapping. Maybe not a visible flapping >hinge, but some elasticity within the blades or the blade holder. The >Bo105 and the Ec135 has no flapping hinge as well. I gather then, that we need to somehow measure effective values for all of the parameters that aren't obvious? How would you recommend measuring or calculating the effective flap hinge ratio? Thanks again, Thomas -- ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] CPRC Autonomous UAV Helicopter
Hello Thomas, Thomas Hamilton schrieb am 01.05.2010 20:33: > Hello, > I am a member of a college robotics team and we are currently building > an autonomous UAV helicopter. > We wish to use FlightGear for research and development, however after > an exhaustive search we have failed to find even one small-scale > helicopter FDM. > We would like to know if it is possible to create an accurate FDM for > such a vehicle, there are no size limitations in the rotor logic within YASim, and as far as I know, the same is valid for YASim itself. > and if so are there any nuances in YASim that we need to account for > in scaling and/or stripping off some features that don't apply to this > vehicle (such as flapping). I am sure your helicopter has flapping. Maybe not a visible flapping hinge, but some elasticity within the blades or the blade holder. The Bo105 and the Ec135 has no flapping hinge as well. > Our specific helicopter is a Bergen Tazer, it has about a 6 foot > diameter rotor span and runs on 4 Li-po batteries. > If it is possible, we will begin developing one and possibly making it > available to the public. Thank you for your time and effort. Best regards, Maik -- ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
