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will you be chipping thicker material? or mostly brush?
the 250, or any disk, will handle brush better, the 1390, or any drum, will handle larger wood better.
-steve
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You have it backwards. Disk chippers handle big wood better. Has to do with the angle the knives are contacting to wood. A disk is always hitting the wood straight down. Where as a drum chips brush better because the drum pulls the brush in as it chips. But when it comes to chipping wood , you need a drum twice as tall as the diameter of the wood you are chipping to maintain optimum knife angle