I bought a second one recently on eBay too. I think the Goldberg Shoestring was my first successful .35 sized plane when I was 14 powered with a G21-35 on suction. It pulled like a train while flying at 70 mph and was not often grounded by western Kansas winds. I covered it with Fascal which refused to keep the paint attached, as a consession to my mom who hated the smell of dope. I think it was a much better flyer than the other Goldberg Goodyears.
While it was fun to stunt, I found that I could land it and run it around the circle for half a lap or more at speed. All was good, and could have been better had I noticed the axle holes in the wheels were getting larger. So one day after doing this for weeks, one wheel decided to turn the corner and ran up the leg to the fuselage. The result was about 30 zero radius outside loops at ground level........,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.,.....