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Ex. 1: 3.5 mph x 36 ft / 10 = 12.6 ac/hr

80 bu x 12.6 ac/hr = 1008 bph

Ex. 2: 4.0 mph x 36 ft / 10 = 14.4 ac/hr

80 bu x 14.4 ac/hr = 1152 bph

1008 - 1152 bushels per hour is a safe estimate of what you'll likely be able to cover with your new 8010 and 36 foot draper.

The "long" version of the above formula is:

Ex. 3.5 x 36 x .825 = 12.6 ac./hr.

Ex. 4 x 36 x .825 / 8.25 = 14.4 ac./hr.

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486 Posts

i reckon that formula never works in the real world though!

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There is a good way of figurering your efficiancy rate out. Just look at your engine hours and seperator hours. Log them as you start on a new field and log them when you finish a field.

That will give you a pretty accurate idea. And honestly i think 75% as an average on the whole season is way too high. but i dont know to tell you the truth. Just like you pointed out Muddy, the combine itself is just a very little brick in the puzzle

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5280 X 3.5 X 36 / 43560 (sq ft / ac) = 15.2 not 12.6

By the way your simplified area calculation actually works metrically.

5.6 km X 11m = 61.6 / 10 = 6.16 ha

I'm sure I'll have all North American farmers converted to metric by sunset.

Or maybe when heck freezes over.

1 of the 2.

Don

Yes, I use that formula to calculate just the above, but it won't tell me or anyone here, exactly what's done over a 10-16 hour day.

Simpler calculation is just header width x ground speed >acre for approx acres/hour. However, even that's not exact, counting for overlap, speed variances and so on.

Now you just gotta love acre counters, yield monitors and GPS!

5280 X 3.5 X 36 / 43560 (sq ft / ac) = 15.2 not 12.6

By the way your simplified area calculation actually works metrically.

5.6 km X 11m = 61.6 / 10 = 6.16 ha

I'm sure I'll have all North American farmers converted to metric by sunset.

Or maybe when heck freezes over.

1 of the 2.

Don

Don, your equation is correct, if you are not accounting for efficiency. Ground speed x Working Width / 10 is the productivity formula at 82.5% efficiency. I probably do give up 15-20% efficiency, just like you and everyone else does. Hence, the reason why 82.5% has been settled on by every mfg as the published / quoted generally accepted rate of efficiency.

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