Re: [Flightgear-devel] about fdm properties

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

On Fri, 3 May 2013, Alan Teeder wrote:

> It exposes a serious problem in JSBSim which affects all Datcom users.

Isn't it rather a missing feature than a fault in JSBSim?

The JSBSim documentation and axis names are fairly clear on that the 
moments are specified around the yaw, pitch and roll axes (but the origin 
is at AeroRP rather than at the body frame origin/CoG so additional 
corrections according to the parallel axis theorem are added based on the 
distance from AeroRP to the actual CoG).

If the DATCOM -> JSBSim input translation is faulty (I have no 
professional grounding in aerodynamics and I cannot tell) the best place 
to get it addressed might be at the mailing list/group for Bill 
Galbraith's DATCOM+ program (I think it is the most commonly used way 
to generate a JSBSim configuration from DATCOM):

http://tech.groups.yahoo.com/group/digital_datcom/

Cheers,

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