Re: [Jsbsim-devel] Structural simulation (or not)?

[Anders G. <and...@gi...>]

On Sun, 19 Jan 2014, Erik Hofman wrote:

> On 01/19/2014 02:41 PM, grtuxhangar team wrote:
>>
>> btw: searching Git Aircraft  i just found the DR400 Dauphin (jsbsim) she
>> also use a  FG ground reaction workaround
>>
>> and cap10
>> So i wonder how many JSBSim Aircraft within Git are using a workaround.
>> May be more that we could guess .
>
> I've identified 14 aircraft that are possibly effected by the change:
>
> ./Aircraft/Alouette-III/Systems/terrain.nas
> ./Aircraft/Cap10C/Nasal/cap10c.nas
> ./Aircraft/DR400-dauphin/Nasal/dr400.nas
> ./Aircraft/DR400/Nasal/dr400.nas
> ./Aircraft/F-8E-Crusader/Systems/terrain.nas
> ./Aircraft/JA37/Nasal/crash.nas
> ./Aircraft/MiG-15/Nasal/MiG-15bis.nas
> ./Aircraft/Noratlas/Systems/terrain.nas
> ./Aircraft/P-38-Lightning/Systems/terrain.nas
> ./Aircraft/PBY-Catalina/Systems/terrain.nas
> ./Aircraft/PC-6/Nasal/pc6-b2h4.nas
> ./Aircraft/S-51-Dragonfly/System/terrain.nas
> ./Aircraft/SR71-BlackBird/Systems/terrain.nas
> ./Aircraft/VMX22-Osprey/Nasal/terrain_under.nas

You can also add ./Aircraft/Short_Empire but for different reasons.

Although I perfer to implement buoyancy using my external forces based 
hydrodynamics system that model uses gears for the wing floats - it is/was 
an easy way to know how far the floats have submerged by using the 
compressed-ft property.

Now that BOGEY gears by default sink through fluids it would be nice to 
be able to either disable that (i.e. get the old behaviour) or to extend 
the STRUCTURE points with additional properties so that they provide more 
of the properties BOGEY gears provide.

In fact, adding world position, velocity and acceleration properties for 
contact points might be one way to implement the "general" reference 
points I've been talking about for years but never got around to actually 
implement. :)

I have not looked at the implementation of this feature yet so I have, at
this time, no input regarding the software engineering aspects.

Cheers,

Anders
-- 
---------------------------------------------------------------------------
Anders Gidenstam
WWW: http://gitorious.org/anders-hangar
      http://www.gidenstam.org/FlightGear/