On Sunday, August 16, 2020 at 11:37:01 PM UTC+12, wrote:
"Assuming you are US based I guess you could use them if your airframe is
Experimental"

Check your operating limitations page. A major mod could invalidate your airworthiness certificate.
You still need approved data for the installation of winglets in the experimental exhibition and racing world.

Interested in makink or buying mosquito set, is there any documentation or STC?
REGARDS,
Andy Mackay
andymacfly2002 at yahoo dot com