A misnomer... I know for a fact that our LS-4 shows up on local approach
control radar.. as does the Grob 103, and the SGS1-26 and 2-33 is a dead
give away.

The problem is not the glider, its the relative motion. Software in the
"digital computer display" will filter out targets that appear not to be
moving to get rid of "clutter" or other atmospheric anomalies.. slow to
below 40knts straight line ground speed and you just may get filtered out
and not displayed.. core a tight thermal.. same effect.. less that 40knts
effective ground speed in a given direction and you will be filtered out and
not displayed... in this case.. "beaming to the doppler notch" is a bad
thing.. Military fliers will know what I mean.

I listen up on the local ATC Radar frequency and have talked to them on
occasions.. they have called me as traffic to other aircraft.. "traffic, 2
o'clock, 3 miles.. appears to be a glider, altitude unknown". Our local ATC
radar looses coverage about 4000ft AGL and below in the valley where our
glider club is.

If you really want to know you are seen, invest in a transponder with ModeC
and squawk 1200.

BT
(too many years on both sides of the radar)

wrote in message
oups.com...
Modern gliders are small and made of materials that show up poorly on
radar.

Are we basically flying stealth aircraft?

Johan Larson