Le samedi 11 juin 2005 à 10:20 +0100, Lee Elliott a écrit : > On Friday 10 Jun 2005 22:41, Andy Ross wrote: > > theoreticle wrote: > > > Let's say someone comes up with a model for the old Pan Am > > > Clipper, that wants to land fully loaded with passengers and > > > half loaded with fuel. The actual aircraft will sink it's > > > fuselage as far as 5 feet into the water, perhaps more if > > > landing in 'seas'. There absolutely must be some code to > > > support sea planes landing in the water. > > > > The water interaction really isn't so difficult (it's just > > like landing gear compression, but with an extra term for drag > > due to water flow). > > > > The harder part is hacking the scenery subsystem to understand > > which polygons are "water" and propagate this information out > > through the groundcache to the FDMs. That will likely require > > touching a ton of code all over the simulator; it's always the > > data modelling issues that cause the problems. Algorithms are > > easy. > > > > Andy > > One problem with using YASim for sea planes is that the fuselage > mustn't contact the surface as this equates to a crash. While I > was experimenting with the SR45 I found that I had to omit the > lower fuselage deck to achieve this, which must then affect the > flying accuracy. > > I sort of got around it by using a non-retractable gear, which at > least added some drag back. > > one of the last things I tried was to link the brakes of this > gear to the gear compression so that the braking effect reduced > or increased as the hull rose or sank into the water. > > LeeE > Oh you met exactly what i got when i tried (for the fun) to model an helicopter with floats (SeaStallion) . I could not use JSB (no rotor FDM) and with the use of Yasim it has been very difficult to find the right way which make that model to stand correctly on water with gear-up. To answer that, JSBSim gives a better flexibility. > -- Gerard
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