Andy Ross writes:
> JSBSim and YASim do things pretty much the same way, using a > coefficient of friction for gear as they slide over the ground. This > integration works fine for a moving aircraft,
Unfortunately, not -- when the JSBSim and YASim aircraft are rolling, they are still far too much affected by the wind. In real life, even with 30 kt gusts, you can usually taxi a 172 or Cherokee around as if it were a car. Personally, I do set the controls appropriately just in case (I'd hate for that one gust to get under the wing and flip me), but I have not seen it make a noticeable difference.
Thinking about it a bit more this makes sense.
Calculating every wheel separately isn't the whole story. In the end there is the friction caused by the complete landing gear which isn't wheel spin dependent.
So now you've got:
1. friction calculate every wheel separately.
2. add all frictions for the landing gear.
3. make the friction for every wheel dependent to wheel spin and use the result for moments and force calculations.
4. calculate the moments and forces for the complete landing gear.
5. calculate the result by averaging(?) the results for the complete gear (add this for all wheels) and every separate wheel.
Does this make sense?
Erik
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