> -----Original Message----- Mathias Fr�hlich asked
> Sent: 08 July 2004 10:12 > To: FlightGear developers discussions > Subject: Re: [Flightgear-devel] status of aircraft carrier > > > On Donnerstag, 8. Juli 2004 09:50, Vivian Meazza wrote: > > The volume of the steam reservoirs are large in comparison with the > > volume of the cat cylinder, so there is only a slight drop in steam > > pressure over the stroke. As far as simulation is > concerned, the cat > > force could be considered to remain constant over the whole of the > > stroke. > Neglecting fluid mechanical effects. > But that is most likely sufficient ... > > I am not sure, but I believe that I have read that newer cats > are driven by > magnetic fields. Something like magnetic monorail trains or > eddy current > brakes work. > Is this true? Yes, electro-magnetic cats are under development, but I'm not sure of their development status right now. > > But even this ones will produce a constant force. So this is > really the same. > > > > So for the cat we apply a suitable force at the cat > attachment point, > > and for the arrester wires at the hook attachment point, > remembering > > that there are vertical as well as horizontal components. > > > > Is that enough detail for some initial design? I can dig > around in my > > memory some more, or do some more research if you need it. > > If you have some interesting references I would be interested too! > > I have a picture in my head that at least the F14 and F18 > have a launch bar in > front of the strut and a wire behind the strut. Both together > are able to > pull the nose gear down to maximum compression, providing a > negative angle of > attack while the aircraft is pushed by the cat. Then when the cat is > decoupled the now heavy compressed nose gear spring will help > the aircraft to > fast increase the angle of attack and produce enough lift to > stay in air. I think the wire to which you refer is the holdback. Don't worry to much about the nose oleo compression - it just happens. > Are there different cats for different aircraft on the same carrier? On some carriers the cats are of different lengths: the longer ones are used for the heavier aircraft. In any case the steam pressure is adjusted to provide the appropriate acceleration for the aircraft launch weight. Regards Vivian _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
