For Example John Smith wrote:

The Glasflugel Mosquito flap/spoiler combo is terminal speed limiting. I
believe that was a requirement until right around 1980?

It disappeared in the mid or late 60's, which is why the Std Cirrus and
other late 60's - early 70's gliders had relatively weak spoilers.

My ka-6E had terminal speed limiting spoilers, and I enjoyed their
ability.

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Eric Greenwell
Washington State
USA