To be honest I did not put any CDI in (yet). And it is coded in JSBSim, not
Nasal (want to keep the plane flyable on my not so top-of-the-notch computer).
I just turn the aircraft for a certain period of time (based on groundspeed,
turn rate, ground track, nex leg course) and than switch over to the next leg.
I also put some 'lead-in' time in as the AC wont be at the defined turn rate
instantly.
The AC then ends up very close to the leg-track, with the nose pointing in the
right direction. The AP adjustment if needed is relatively subtle.
Eric
From: zakal...@mac.com
Date: Mon, 30 Sep 2013 12:52:08 +0100
To: flightgear-devel@lists.sourceforge.net
Subject: Re: [Flightgear-devel] GPS - merge request
On 30 Sep 2013, at 12:29, Eric van den Berg <evan_den_b...@hotmail.com>
wrote:The other stuff I asked Dirk to add as it makes our extra500 (GPSS) AP
design a lot easier.
Incidentally if you (Dirk) are looking at this code, the really great thing
would be to get the turn-anticipation code enabled. All the pieces are there
(compute a standard rate turn based on inbound / outbound leg courses, compute
time before WPT to start turning based on ground-speed), but it's always been
disabled because I couldn't figure out a stable formula for CDI deviation / XTK
in the turn, and especially when transitioning between turn-anticipation and
normal leg modes. (So there was an ugly wobble when turn anticipation starts
and ends, with the AP did not like).
Any comments, or contributions to this, would be great, since a few people have
ended up implementing kludges at turn-anticipation in Nasal, when this code
should really do it all from C++ nicely.
Kind regards,James
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