You might want to post this to the JSBSim mailing list, too. There is a growing
amount of
discussion there about modeling helos in JSBSim, if that is what you are aiming
for.
Jon
> -
> ghours wrote:
>
> I have tried to make two helicopters as close as possible to the
> specifications
>
> 1/ CH53 seastallion: mass:36700 pounds
> 2/ AS330 puma : which is 16300 pounds
> it is very difficult to give the good delta and rellenflaphinge
> parameters according to the real model.
> The result for the flyable modele does contain non realistics parameters.
> I could never get goods result whith torque activated. Sometime it work
> , sometime it don't.
> It seem that the programm dont like the heavy helicopter.
>
> CH47 chinhook which is in the stable distribution, is not realistic.
>
> I tried to remodelise it good mass good sizes good rpm , its crazy the
> two rotors makes funny results
>
> In fact we should probably take advantage to develop a spicifique FDM
> helicopter, i am not abble to do it.
> -
>
> I am looking into modelling rotors in JSBSim. More information will follow
> on my website, but I plan to model the rotor system properly so that things
> like rotor RPM, rotor inertia etc are important.
>
> The problem with the Chinook is that the rotors are manipulated in strange
> ways. Pitch is provided by varying thrust, roll by rotating the rotors left
> and right together and yaw is provided by rotating the rotors left and right
> in opposite directions. Additionally the forward movement is permitted by
> rotating the rotors forward to allow level flight. (otherwise the fuselage
> would provide too much negative lift.) This can all be modeled by
> conventional rotor systems if they are coupled properly.
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