Chris Nicholas wrote:

Mil80c , another point you need to be
aware of;

Many gliders, e.g. mine (a Ka6E), have neither panel space for a
transponder nor capability of carrying any more weight for the extra
batteries - I am already on max AUW, on a CofA which has already been
extended as far as it can be - I am 208 pounds with a parachute, and
there are plenty of heavier pilots than that.

If a new generation of lightweight, low power transponders emerges (the
UK CAA has persuaded one manufacturer to build a prototype which tested
OK), and if ICAO accept 20 w output instead of 100+, and if the thing is
taken to commercial production, and if it can come with an option of a
small remote control panel I could strap to my knee, with the larger
piece and battery going into the stowage behind the pilot's seat, and if
I can lose enought weight to compensate for it, then it might be viable.

Transponder + encoder = 1 kg
7 amphour battery = 2.3 kg
ant and cable = .4 kg
mounting all of it = .5 kg
TOTAL = 4.2 kg or 9.3 pounds

If this is what is keeping you from installing a transponder that you
think you need, I suggest you take another look at your priorities. Put
in the transponder by - losing 10 pounds; getting a lighter parachute;
removing something from the panel; flying 10 pounds overgross and cut
your critical speeds a couple of knots. Or, if you want to spend about
$600-700 more, get the Filser Mode S when it's available and shave off a
couple pounds using a smaller battery and no external encoder.
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Eric Greenwell
Washington State
USA