Hello,
Just in case, if somebody is interested on it:

 During the past weeks i have included to F-8E, some carrier  features.
That model is JSBSim FDM.

====1/ the usual Carrier capabilities ( the same we have years ago with YASim)
   => the arrester Hook which operate on wires .
That feature is fully part of JSBSim
  => the catapulting which operate at the right defined place on the carrier
That feature is working only with an (external to JSBSim) additional 
description of the carriers, and a nasal script which calculate the position 
of the catapults.
There is no lag problems  :)
Arrester hook and catapulting are using the JSBSim external_reactions 
functions, which offer a great flexibility.
This has been tested with, every carrier which are in CVS ( and others which 
are not yet in cvs ) 
Part of the FDM data (carrier capabilities related) can be used with other 
aircrafts
I have tested it with the  F-4N (from Dave Culp) and several WWII propeller 
Aircraft ( from me ) the behavior is right.

====2/ A mule which taxi manually the Aircraft on the deck and in the hangar,  
or, in an airport.
That feature is part of the JSBSim external_reactions functions.
I will be improve the animation of the mule with the new model manager :) .

====3/ An automatic taxiing from anyplace (but conditions , see below)  to a 
wanted catapult.
There is nothing to do, else than, to indicate which catapult we want to go 
to.
There is not any predefined path  the behavior of the Aircraft is controlled  
and calculated, in RT.
This is part of the JSBSim external_reactions functions, and the usual JSBSim 
FCS functions <summer>, <switch>, <pure-gain>, scheduled-gain> ... so on.

If you are curious look at the Aircraft/F-8E-Crusader/Systems/taxi.xml file.

This work, now, only, (sorry) with the following condition:
                 the starting point must be behind the destination catapult.
I hope to improve that feature in order to answer to "start from any point => 
go to anypoint" without condition (i only need time to do it).
For instance, on the Nimitz, you may go, from the Park-1 to Cat-1, you cannot 
go from Park-1 to Cat-4.
>From Cat-4, to Cat-2 or, to Cat-1 is not a problem.
To start from the rear of the deck, gives you access to any catapult.
The aircraft will go slowly, and will stop brake ON at the catapult place.

Then you only have to Engage the LaunchBar which lock the Aircraft in place  
and, if necessary will correct the position.
And, then you can catapult.

If you are using the French carrier Clemenceau or Foch, when the LaunchBar is 
engaged the JBD of the catapult related is raised ( only that one, not the 
other )

I hope this usefull, however only available with JSBSim FDM.
Anyhow, i guess this could be done with Nasal.

Oh, i forgot to say, obviously, working with moving carrier, i have tested 
these features with Foch at 15 knots and others at 10 knots.

-- 
Gérard
http://pagesperso-orange.fr/GRTux/

J'ai décidé d'être heureux parce que c'est bon pour la santé. 
Voltaire


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