On Monday, January 27, 2020 at 2:53:39 AM UTC-5, wrote:
Hi, is anyone able to point me in the direction of pictures or patent number that describe the retracting & rotating main wheel of the SZD Cobra or the Grob Twin II A? Regards Mark

I use Google Patents for a lot of searches.

Try this link for the Grob patent; https://patents.google.com/patent/DE...ng+Grob&page=2

Good luck!