On Fri, 26 Nov 2004 01:37:03 UTC, Nyal Williams
wrote:

: Boating stores sell radar reflectors made of cardboard
: and covered with aluminum foil.

I have never seen a cardboard one, but I do have a light alloy one on
the boat.

: I inquired about their use in gliders (practically
: no weight and could go in fuselage behind wing) and
: someone told me they would not give a strong enough
: signal for aircraft use owing to the speeds involved.

I have heard that a military ATC who visited one site where I fly said
that it would make a considerable improvement to the radar return from
a glider. It's on my list of things to do.

Ian