Mathias Fr�hlich wrote
> Sent: 08 July 2004 10:38 > To: FlightGear developers discussions > Subject: Re: [Flightgear-devel] status of aircraft carrier > > > On Mittwoch, 7. Juli 2004 21:32, Vivian Meazza wrote: > > It would be a shame if we can't model individual wires, > then we could > > experience hook-skip whereby the hook can miss all the > wires. A chum > > of mine went around 14 times trying to catch a wire in a > Gannet aboard > > HMS Hermes. But I think the 'wire-surface' would do quite well. > Hmm, let me explain a bit. > I for myself will be happy to model the relality in detail. > That wire-surface has grown from an experience I have made > during the past > half year when I wanted to push changes into JSBSim. For > example, I often > proposed a mechanical system which much better models gears. > This is not hard > to do from my point of view. But Jon always told me that this > stuff is tooo > complicated and it is better to keep things as simple as > possible. So that 'wire surface' has really grown from a > extrapolation of my counterpart > in JSBSim to the flightgear community ... As I said, I think the 'wire surface' will do fine. KISS, at least at first. > ... I am happy with individual wires. It is a bit harder > since we do only have > the position of the hook at discrete times. But I have also > thought about > that: > Does the surface spanned from the hook in the previous time step > and the hook in > this time step intersect a wire? > If yes we can have a probability where we catch. And if so > apply two forces > from the ends of the wire. > > So the API between the FDM and Flightgear will look something > like a function > taking a geometry of a rectangle and returning a bool which > tells if a wire > is caught and where the two points are where the wire leaves > the deck. And as > usual, how these two points move. The wire slips through the hook, so I think that the action of the wire con be regarded as a decelerating force acting at the hook attachment point, along the aircraft centreline. Good enough I think. > > It's very difficult to manoeuvre an aircraft onto a cat. You should > > consider modelling the self-aligning rollers and chocks > which bodily > > shift the aircraft into the correct position. This need be no more > > than a area on the deck on which, if the main wheels are resting on > > it, a press of a key will automatically correctly position the > > aircraft. > So with a little jump to the right :) > Sounds sensible! Just like real life. > > A key press should signify when the pilot is ready for launch, then > > the cat should fire after a random interval after. > > > > The Jet Blast Deflectors (JBDs) could also be modelled. > Hehe :) > > And a cat officer showing you where to taxi :) > And all these guys with yellow and green and whatever jackets :) > > One by one. But yes ... I've seen it done in another flightsim. Back to bones? > I think I will put several hundred wires onto KSFO's runway > to do the first > tests :) Nothing like making it hard :-) > > I can provide more details if you are interested. > Yes, whatever you fell that could be useful. > References .. I'm looking in my library for some nice photos. Regards Vivian _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
