Pete, I've been watching for another Brinly planter so I could put two on a toolbar to do what I want. If you set the planters for 40" rows you will always get the room you need to run between them. Make your first pass, you get two single rows at 40". The outside row will have to remain as a single. Turn around and set over to get the spacing you want between paired rows and make another pass. That will give you a paired row and another single. Repeat across the field. You may end up with varying spacing in the paired rows but all your wide rows will be 40". The two outside rows will be singles.
I planted paired rows last summer and the corn did as well in the paired rows as it did in "normal" rows. Doing it with a single row planter I did get a few wandering rows which got tilled under in places.
I planted paired rows last summer and the corn did as well in the paired rows as it did in "normal" rows. Doing it with a single row planter I did get a few wandering rows which got tilled under in places.