My rule of thumb acre calculator I was taught many yrs ago shows 7.14 acres. 3.4 mph X 7' cut= 23.8 ÷ 10=2.38 acres cut per hr X 3hrs = 7.14 acres mowed. I agree cell phone should have a MPH calculator.
Got it. In my calculations, I forgot to multiply the 3.4mph by the hours. That makes sense now. I can believe that filed is about 9 acres. So the 3.4mph must be correct. I was moving along pretty consistently with few bogs and few time consuming turns.
I never have been able to master those right angle turns and not leave a pile there or an uncut piece. If necessary, I'll stop, back up and start again.
Thanks Jim, according to that ACME map, the field is 4.6 acres. I also found that my county has a gis map with a similar thing where I can draw a perimiter and it calculates the area. It agrees with 4.6 acres. I guess I'm not mowing as much as I think.
calculate your minutes and seconds into total seconds. divide that number into 1800. [since using a half mile not full mile (3600)]
your 6th gear = 358 seconds 1800 / 358 = 5.02mph
prefer using an app for smartphone, and for accuracy sake don't like using the truck to guess a half mile.
could Google distance in feet for some "country" miles locally
Google Earth also has a tool to measure acreage as well as findlotsize.com.
The general rule is mph x cut width divided by 10. Figures about 80% efficiency.
No one ever nows at 100% efficient.
If you average 6" overlap, and only cutting 6.5' per pass, that alone knocks 7% off. Then you have turns or the last pass that may only be a foot wide. The formula above takes all that into account.
If your field is 800' long, it takes 160 seconds at 3.4 mph to make the trip. If it takes you 10 seconds to turn around...you loose another 6% efficiency. So now you are getting ever closer to 80% and the formula I listed.
Just what are you trying to figure? How big exactly is the field according to county GIS, or Google, etc? And how long does it actually take you to cut it