Re: Flight Models for newbee's

Frankly I have looked a jsbsim and I t uses a lot of envelope 
preprocessing. It isn't so much computing the aircraft as doing lookups 
under a multitude of circumstances and giving you the response for the 
one you are in.

Xplane actually breaks down each airfoil piece and computes the forces 
on it as if it were a separate aerodynamic body and then sums them all 
while doing a separate fuselage estimation and some downdraft 
calcualtion attempts.

Sounds like larcsim just does very approximate lookups.

None of these are good for planes that haven't been stuck in a wind 
tunnel and "precomputed"

On Wed, 14 Jun 2006 6:59 am, Correu PelDavid wrote:
> Hi,
>
> I'm studying theory control, and I'd like to play a bit with 
> helicopter's capabilities.
> I'd like to work on their model.
> Flightgear works with YAsim, JSBsim and LaRCsim.
> I've take a look at the LaRCsim manual. It says it uses "a set of 
> equations of motion for a rigid-body aircraft in atmospheric and 
> low-earth orbital flight".
> In fact, using the equations of a 6D rigid-body is where I would have 
> started if I were to choose without more info.
>
> I wonder how the other models work.
> For instance, I know the X-plane engine considers the aerodynamic 
> planes. A totally different point of view from LaRCsim, but still 
> accurate and working.
>
> Where could I get some info on YAsim and JSBsim?
> Could you draw me a shot of the main ideas?
>
> Thanks and sorry for my grammar.
>
> David