I think the top two are both Ka-6s. The first might be a Br, Cr or maybe
an E. Notice the cutout in the elevator at the root. Almost looks more
like the cutout on the all flying tail of an E. The SZD-59 does not have
this big a cutout. Other proportions are very much Ka-6.

The second is defintely a distorted image of a Ka-6, and not a Boomerang.
The Boomerang has a swept, all flying tail. It is probably a Br or a Cr.

The third photo, I agree with Paul. It looks like a couple of Swifts.

Steve Leonard