I do not know what brand of retracts they are. There is not a marking on the exterior of retracts. It looks like a standard 60 size mechanical retract. Perhaps too small.

One other item has got me thinking. The other pattern flier does not have these problems. As already mentioned he does not roll in the grass as long as I do, but he has different wheels as well. I do not know the manufacture of them but they have a polished metal hub and a foam tire which has a flat contact area, ie. looking at the tire from the front it is square. I wonder if this tire shape is less draggy though the grass. Hmm.

I do like the idea of oversizing the struts by 1/32" It has to be stronger with minimal weight penalty.

Mitch