Tiller Yanmar Rotavator/Tiller Blade direction for ridges?

[vectorox]

I know from passed experience that one of these tine configurations makes nice potato ridges, but I cant remember which one, and diagram is in Japanese. Anyone know? Thanks.

 

[Lnk]

I know from passed experience that one of these tine configurations makes nice potato ridges, but I cant remember which one, and diagram is in Japanese. Anyone know? Thanks.

View attachment 503156

Just guessing, but the bottom shows all tines on each half the same. Seems they would move the material either toward the center, or move material to both ends. Wish I learned Japanese so I could be sure. Good luck.

 

[bigtiller]

All of my customers plant potatoes in the furrow the tillers adjustable depth gauge leaves.

 

[vectorox]

Thanks guys. It was the All-Facing-Inwards arrangement, I'd forgotten I'd change them around when I replaced some tines and welded some mounts and wondered why it wasn't doing it any more.

@ bigtiller: We plant in the tops of ridges here because it's a wet climate.