On 11/25/02 at 10:11 AM Curtis L. Olson wrote:

>David Luff writes:
>> Is it likely to work over a 56K modem?
>
>David,
>
>First of all I will say that that I haven't tried it.  But, I
>encourage you to try it yourself since I want to know the answer
>too. :-)
>
>I suggest that you start out in the C172 and fly with that.  If you
>have good luck there, then you can try faster planes.
>
>I'm fortunate enough to have a DSL connection at home (they finally
>got service to my area) and with the latest tweaks to terrasync I've
>been able to sustain upwares of 2000 kts. with 32km visibility.
>(That's in the a4, time accelerated either 2x or 3x ...)
>
>So, if you are flying at 1/10 the speed, you might do just fine with
>1/10 the bandwidth.
>
>Let us know ... :-)
>

Well, it mostly worked.  After starting in an area with no scenery, it took
a couple of minutes waiting before the appropriate airport came down, and
FlightGear could be restarted properly.  Flying the C172, terrasync mostly
kept up, but in both my tests (one in the bay area, one in the relatively
sparser UK) managed to miss one tile.  I may be mistaken, but it appears to
download a whole 1x1 degree area at once in alphabetical order, and there
were times when nothing was coming down, so I think that if the order of
the tile download within a 1x1 chunk was optimised to get the closest
first, and if downloading was continued almost continuously based on
position and heading, then I'm quite sure it could be made to keep up no
problem.

Very impressive stuff anyway.

Cheers - Dave


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