The main thrust of this thread is of course collision avoidance, not who invented the corner reflector or whether aluminum or aluminium is correct.
Whilst a corner reflector will increase the RCS of any plastic aircraft, its only of any use when it comes to collision avoidance IF and only if:
a) the intruder aircraft has radar and sees the returns, or
b) the intruder aircraft is in contact with a radar service that sees the returs from the glider.
Not all low flying fast jets are fitted or even designed to be fitted with radar, neither are many other aircraft that could pose a threat.
Although it is possible that the intruder is in contact with a radar service, there is no guaruntee of this., or the significance of the radar return.
What is needed is a lightweight handheld Mode S transponder/comms/nav unit that costs peanuts and needs microAmps of current to run so that you can carry it in your flight bag or stow it in the cockpit.
Only problem is no one makes one because no one wants one heheh. If we can have multi band mobile phones with video and voice and data comms, why not a tranceiver with a vor built in and transponder? ICOM do the first two so why not the last as well?
just my two penneth
Oh and why not fit LED strobes to increase visual conspicuity?
soz for any spelling/ grammar mistakes...
Ian