tractor speed formula?

[Mowingman 0]

what's the formula for figuring out tractor speed? I couldn't find it in the last 60 days of topics, I remember a thread with it as a reply

[Kent 435]

http://www.simpletractors.com/club2/topic.asp?TOPIC_ID=38813

[dhardin 0]

I have a quick way to tell tractor speed. I have it printed out on a card that is laminated and on a magnet on all my tractors. Hers how it works: I put a yellow grees pen mark on my back tire and count the revoluctions in a 15 sec. Then the little chat show the speed in MPH. Ill get a copy for you all if you like. Here is a photo, sorry you cant see the card very well. [img]attach/dhardin/IMAGE0127s.JPG[/img]

[Nubian 3]

I would really appreciate a copy of the chart anyway I can get it email or repost to make it legible then we can hand copy it;)

quote:

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Originally posted by dhardin
I have a quick way to tell tractor speed. I have it printed out on a card that is laminated and on a magnet on all my tractors. Hers how it works: I put a yellow grees pen mark on my back tire and count the revoluctions in a 15 sec. Then the little chat show the speed in MPH. Ill get a copy for you all if you like. Here is a photo, sorry you cant see the card very well. [img]attach/dhardin/IMAGE0127s.JPG[/img]

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[floydmassey 0]

Would that card work for every tractor, or would it change if the wheel size changes? Thanks

[dhardin 0]

Its based on the 23x 12 tires on most of the Allic and Simplicty. I have tied to load a file with the card/formual but its set up in pagemaker and most people dont have that program. Ill have to find a scanner. Basiclly for every revolution of the tire in the 15 sec. it is 1/4 of a mile per hour if i remember right. Ill keep trying to get it posted. Truth be known, I set this up for the club to have and maybe sell for a fund raiser. But no one was very interest in hearing about it when I first joined. I have this and several others projects in my old computer some where.

[stevenj 4]

With your tractor on level ground make a mark on the tire at the 6 o'clock position (nearest the ground). Put a mark on the ground at the same point. Now, move the tractor forward for several complete revolutions of the tire. It doesn't matter how many, but remember exactly how many you used (I'd try something like 3 to 6 revolutions). Bring the mark you made on the tire back to the 6 o'clock position and make a second mark on the ground at this new reference point. Next, measure the distance between the first mark and the second mark on the ground. This is the distance traveled between "x" revolutions of the tire. Now, when you are driving, record the time for the tire to make the same number of complete revolutions. You now have the distance traveled and the time to travel that distance. This is your speed (ft/sec). To convert to mph use the following formula (# of feet traveled in "x" revolutions) / (# of secs to complete "x" revolutions) x (3600/5280) = speed in mph or, you could place two stakes in the ground say 25 or 50 feet apart and measure the time it takes the tractor to travel between the two stakes and then use the same formula. Just remember to use the same reference point on the tractor to start and stop your timing. Basically, 1 mph is 1.47 ft/sec 5 mph is 7.33 ft/sec 60 mph is 88 ft/sec