Posted by ss55 on May 17, 2013 at 06:58:11 from (173.19.101.220):
In Reply to: Re: acres per hour posted by George Marsh on May 16, 2013 at 18:17:32:
George, There's nothing wrong with your calculation. 8 Acres per hour is correct for the maximum or "gross" the machine will cover when it is up and running. The difference is it is nearly impossible to keep a machine productive 100% of the time. The old timer's rule of thumb works out to about 80% effieicency or 80% utilization. So 8 Acres per hour x 0.8 utilization = 6.4 "net" acres per hour. In practice the the old timer's rule at 6.5 is reasonably close for an estimate and it is easy to remember. For a drill that may still be optimistic.
Small simple tillage equipment where you can just "drop and drive" used in long rectangular fields will have the highest utililization maybe approaching 90%. Larger equipment used in irregular shaped fields will have lower utilization.
Planting and harvesting equipment generally has the lowest utilization because they need to be periodically refilled/unloaded or to switch wagons. Also operations where a good operator neeeds to regularly stop and check how well he's doing the job, make adjustments for the conditions and then recheck after adjustment are made further reduces utilization. That downtime is time well spent, but it hurts utilization. Plannting and harvesting equipment will have lower utilizatation of 70%, 60% maybe as low as only 50% if you must refill/unload from one corner of a long field.
8 acres per hour "gross" capacity is good to used in the dealer's showroom and in the coffee shop. 6.5 is a more practice "net" capacity for planning and that may still be a bit too high for a drill.
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