I'm pretty sure my ASW 15 went from Standard to Experimental before I
bought it. ASW 15s were Standard Certificated, weren't they? It was
Experimental when I got it.There were a bunch of letters between the
original owner (3 or 4 owners ago) and Herr Waibel regarding the
addition of water bags to the wings which was ultimately completed w/a
337 documenting it. I don't know why as, given the pilot weight, the
most that could be carried was 30 lbs. or so. When I got the glider the
bags had been removed but some other plumbing remained. I removed that
and had the ship receive a new Standard Certificate in order to do away
with the potential headaches concerning Racing/Exhibition letters, etc.
The A&P has all lthe paperwork for annual so I can't refer to it for
the details. All probably highly illegal but all signed off by the
proper FAA people.

Mike