Hi all, I have a Yasim question I can't figure out from the documentation. We're working on the sf25b and noticed that both that, and the Grob g109 (which is a similar aircraft so we use it to reference things) seem to suffer from "lack of static friction". I might be misinterpreting the issue, but here's what I've got:
1. When the aircraft is parked with no parking brake, it will usually start to roll slowly backwards -- pushed by the wind and maybe the runway slope. If I start the engine on idle, the thrust generated by the idle prop might stop this roll. On tarmac, even a 3 knot wind is enough to start pushing the plane back. On grass more is needed -- maybe 20 knots? 2. When the aircraft is stopped with the engine off, the prop is turned by the wind. A wind of 3 knots will turn it very slowly (maybe 1 RPM), a wind of 25 knots will turn it a lot faster. 3. The prop will windmill forever. On this particular aircraft, somewhere between 40 and 50 knots the prop should stop windmilling, and stay stopped until about 70 knots, where it should start turning around very slowly, and possibly start windmilling again at faster speeds. I don't see any obvious properties to set to take the engine's resistance to turning over, or the friction of the wheels into account to stop these unrealistic things from happening. How should I go about fixing them? Thanks for your help in advance. Cheers, Vik ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Flightgear-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/flightgear-devel
