Hi Joacim, Joacim Persson schrieb am 02.01.2007 17:50: > On Tue, 2 Jan 2007, Maik Justus wrote: > > >> I thought the next sentence in my mail is the explanation: >> >> "But his is not the real aim. I want to add the ability to use ropes. To >> be used for winch as well as for aerotow." >> > > The real challenge is to make it work over MP with a human piloting the > tow aircraft. (A winch or a towing ground vehicle could by all means > also be human controlled.) > Yes, that is the aim. > > So what's your plan here? Add optional /external/ control of a thruster? > Adding a hinch objects to YASim, which can be connected to a tow. The other end of the tow can be connected to a fixed position or an AI/MP-Object. The length of the tow can be modified (-> winch). > Then it wouldn't matter if it's a towing aircraft being subject to a force > pulling backwards or a towed aircraft being subject to a force forward. > Same implementation. Yes. > It would also work the same for helicopter sling > loads. Yes, but we need a cargo-fdm. > Or towing with mobile ground vehicles. > > But where would the simulation of the towing line go? (Stretch, drag, bend, > weight, inertia... weak links? As a first step I want to simulate the tow with both aircrafts (for aerotow). First I only want to simulate weight and stretch. > A winch wire or a pay-out line doesn't have > a constant lenght.) It's not a "dead" object. A towing line can be released > at either end, by the pilot at each end or by a snapping weak link at each > end. So it's not really a submodel of any of the objects at the ends of it. > Yes. But if it is released by one aircraft, the tow will be ignored by the other aircraft. > I think the tow/airlift wire/line object should be it's own simulation > instance. -- ? > Do you know, if this is already possible in Flightgear? > And of course, designing gliders per se doesn't require any patching of any > fdm backend. The yasim solver needs a thruster element for determining > drag, but the force from that would be the same fwd thrust produced from > sink rate + mass and the L/D ratio at best glide or min sink. (easily > calculated) L/D ratio and airspeed for best glide performance, and sink > rate /airpseed for minimum sink (at a respective weight) are normally > published data for gliders. Just pretend gravity is not perfectly vertical > when defining <approach> and <cruise>... > Yes, you can add a thruster and YASim can simulate glieders as it is. But with a very small patch (adding a glide angle to approach and cruise) you don't need the thruster fake any longer.
Best regards, Maik ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
