Well, for lack of a better word, it's too damn *touchy*
The thing my dad noticed(he's one of the real pilots) was that he had a much harder time trimming it out than on a real plane. The real thing tends to be more "stable" I guess.
Basicly, from my POV, you have to constantly "fight" with JSB to keep it on track, whereas a real plane tends to more readily go where you point it.
It's like you have to compensate *constantly* to keep it on track. The one time I've been in the copilots seat in a real plane, the pilot didn't have to move the yoke or pedals around to get and keep the plane lined up with the runway anywhere NEAR as much as you have to in jsb.
Try doing an approach in yasim and you'll see what I mean. This is also
the same basic difference I noticed between JSB and FS2004.
It's almost like JSB's been over-engineered. The expression "it flies great on paper" comes to mind. And no disrespect to the jsb team(flightgear gives me a woody), I'm just offering the best feedback I can.
Yasim just seems to fly more like a real plane except on takeoff.
As for the weirdness on takeoff, it's simple. After you get a little speed up, and you go to steer the plane to keep it on the runway, it tips over! In a way, it's kind of doing on the ground what jsb is doing in the air, only much much worse. It's almost impossible to keep it on the runway and make a nice takeoff.
It could be I'm overcompensating because of my low frame rate. I can steer the plane great on the ground in jsb, but I usually end up taking off from grass in yasim.
Once it's in the air it flies great.
Just my $.02 - hope it is helpful and constructive as it was intended.
Any thoughts on how to get my frame rate up?
Mark
PS: please pass this along to the JSB team if you think it will help. Thanks!
Mark Wells wrote:
I now realize that I should have been using yasim rather than jsbsim.
The only problem I have with yasim is that the plane does really weird things at takeoff until it's airborne. Once it is, it flys great!
I'm a little confused. You're using the YASim c172 model? This one doesn't get much (er, any) attention in the way of tuning. I'm surprised it still solves, honestly. :)
But nonetheless I'm happy that it's working for you. If you can provide more detail on the really weird behavior you are seeing on the ground, we can try to work out a fix.
Likewise, I'm sure the JSB folks would be interested to hear about what you don't like about the default model.
Andy
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I have noticed something like this in yasim as well. It is only a real problem on tail dragger props, but it may be lurking in there more subtly for other planes as well. What happens is this: First, I adjust mixture, lock the tail wheel, set flaps etc. Then I pull back on the stick and run up the engine to full power and release the brakes. The plane immediately drifts left, so I put in some right rudder, usually about half. at about 50-60 kts (less for the j3) I simultaneously ease the stick forward to let the tail wheel up and kick in some more right rudder, and then promptly do a ground loop to the left. This usually happens around 90 kts in the p51 and it's really violent. I'm usually going backwards in about 2 plane lengths. The only way I have found to get around this is to keep the tail wheel on the ground right up (almost) to rotation speed and to ease the power up very slowly. This takes up several hundreds extra feet of runway compared to running up the engine before releasing the brakes. Sometimes I end up lifting off with the main wheels first, which can also be interesting. I have seen this in the j3, the dc-3 and worst of all the p51d. Is my tail dragger technique bad? I always thought that by the time you can get the tail wheel off the ground you should not need full rudder to stay straight.
Josh
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