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Rotor versus Walker Combines
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JohnW
Posted 9/27/2020 19:17 (#8518201 - in reply to #8518060)
Subject: RE: Rotor versus Walker Combines


NW Washington
Rotary combines are gentler on the crop have more capacity and losses from overloading them tend to be gradual, but they take more power to operate and they beat up the straw and residue.
Conventional combines are tougher on the crop but easier on the straw or MOG but take less power to operate. Walker losses are the downfall of a conventional combine and the losses increase at an exponential rate. Hybrid combines like the NH CX and the European JD models add a "tined separator" with concaves behind the cylinder to help control walker losses.
Also rotary combines are great corn shellers, and corn is number one crop harvested in the USA. They are also easier on beans.

Years ago I remember a CIH service rep talking about how on a conventional combine at the end of the feeder house chain the crop saw a narrow crack and a steel rasp bar traveling at hundreds of rpm and at on a Axial flow it saw a great big whole where is was then grabbed and twisted around and fed in the rotor where the grain was separated and forced through cage at a force eight times higher than gravity.
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