On Friday 17 September 2004 16:09, Vivian Meazza wrote: > Arnt Karlsen wrote: > > Sent: Friday, September 17, 2004 10:03 AM > > To: FlightGear developers discussions > > Subject: Re: [Flightgear-devel] Problem with ballistic sub-model > > > > > > On Fri, 17 Sep 2004 07:56:42 +0100, Vivian wrote in message > > > > <[EMAIL PROTECTED]>: > > > Ampere K. Hardraade wrote > > > > > > > Sent: Thursday, September 16, 2004 7:12 PM > > > > To: FlightGear developers discussions > > > > Subject: Re: [Flightgear-devel] Problem with ballistic sub-model > > > > > > > > On September 16, 2004 01:08 pm, Vivian Meazza wrote: > > > > > There are some other basic shortcomings as well: the submodel > > > > > doesn't inherit the parent accelerations, or the velocities and > > > > > accelerations due to roll, pitch and yaw. Only release > > > > droptanks > > > > > > > when flying straight and level > > > > ..uh, in the real world, this is possible if not permissible, > > with fun > > consequenses like one or more hard points releases jammed for > > at least a while etc. > > > > > > They shouldn't inherit accelerations. > > > > > > Quite right - they shouldn't. I was getting over > > > > enthusiastic there, > > > > > and forgetting my Newtonian physics. > > > > ..don't worry, there is also Murphy law physics. ;-) > > Right, back to Newton :-). I think I've solved the problem. Mixing > elevation up = positive with speed down = positive nearly made my brain > blow a fuse > > I had to reverse a number of signs to get it right. I took the opportunity > to add roll to the submodel so that droptanks will come off with the right > orientation. I not yet added either the parent rotational speed to the > submodel, or yaw, so if you release droptanks with significant roll rate or > yaw angle on the aircraft the submodel will not be quite right. Straight > and level, or nearly so, is fine. > > I've asked Erik to upload the modified files to CVS. It looks OK on the > Hunter, but perhaps Lee could give the revised submodel a good test. > > Regards > > Vivian
Hello Vivian, I just updated from cvs, including updates to the sub-model stuff and while the pitch of the sub-model seems fixed ok, I'm still not able to get the speed right. I tried reducing the <eda> setting to a very low value (0.0000001) and then 0 but the velocity of the sub-model always seems to be zero. As an experiment I tried setting some +ve <speed> values i.e. 10 & 1000 but still got a zero sub-model speed - I tested this by 'releasing' the bomb (bearing in mind I have <repeat> and unlimited models set for de-bugging purposes) while sitting on the runway. Instead of a stream of sub-models moving forward away from the stationary a/c they remain at the origin. If I then accelerate the a/c I leave a trail of sub-models behind me. There's an archive of the a/c at http://www.overthetop.freeserve.co.uk/EE-Canberra-20040916.tar.gz ...if you want to have a look. The release keyboard mapping has been commented out in the ~set.xml file. LeeE _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel 2f585eeea02e2c79d7b1d8c4963bae2d
