On 12/05/2009 01:35 PM, Martin Spott wrote: > The displaced threshold is relevant for landing, in the sense of "don't > touch ground before this line", maybe due to noise abatement measures, > safety or some other reasons.
Exactly so. > The take-off run, in contrast, defaults to start at the runway end, no > matter if there is a displaced threshold or not. Agreed. You are not required to use the full length of the runway for takeoff, but it is safer to do so. > Note, this is > different from stopways/blastways, which are typically not supposed to > be used neither for startup nor for landing. Yes. > Things _might_ be a little bit different in real life. When airliners > are queueing up at the runway end of a large field and you're in a > C172, the contoller might save you from taxiing the entire way and, > instead, request you to enter the runway somewhere beforehand. But as a > default, the displaced threshold does not matter for takeoff. The displaced threshold is never relevant for takeoff. The displaced threshold is the _landing_ threshold. If you decide to take off using less than full length, it would be pure coincidence if the starting point coincided with the displaced threshold point. Any code that computes takeoff position based on the displaced threshold must be considered a bug. ------------------------------------------------------------------------------ Join us December 9, 2009 for the Red Hat Virtual Experience, a free event focused on virtualization and cloud computing. Attend in-depth sessions from your desk. Your couch. Anywhere. http://p.sf.net/sfu/redhat-sfdev2dev _______________________________________________ Flightgear-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/flightgear-devel
