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Hi. I am a mostly small grains and seed grower in western oregon. I have been running helicals for several years now. I have run both the Gorden wireless helicals and the Loewens with the wires. (small wire spaced) I sold the Gordens, though not because they did'nt work, simply because for the small seeds like grass, I needed to keep more of the long straws inside the concave, not outside.

In all likelyhood I will never run a standard concave again. In fact, I was so happy with the helical concept, I took it to the next level. Here's a link with pictures.

You'll see the pattern concave is one of the Gorden wireless concaves.

Here is a link to my first ever corn harvest, which was last year.
Even using the small wires and a grain platform header, I got along ok.

It's been my experience that the rotor setup and concave configuration have more to do with rotor loss than actual area. A properly setup 14xx series machine can out perform a badly setup 16xx series.
It's sort of like the no-till vs. conventional till concepts. You cant use conventional till methods to follow up a no-till planting. It will fail. Cover plates are that same way. If you know how they work and how to use them, they are an awesome tuning aid that allows the machine to do things otherwise impossible.

If you wish to visit with someone respected in the combine field, Ron Kile, the guy that builds the KRF rotor flights, is one who loves to visit about machines. He actually took time last harvest to come down to my area and ride with me for a bit in my helical machine. We did a quick kill and he was able to experience just how the helicals work in grass seed anyway. But I digress.

Even with helicals, I would not discount the benefits that can be had using cover plates in the right situation(s).

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