Hagen Brothers farms,Goodrich ND | Rowdy - 2/10/2008 10:11
Your might want to consider a Handheld GPS. They seem to be very accurate for speed and inexpensive.
Ditto on the GPS. Not only a speedometer that is accurate to 1/10 mph, but it will calculate area, distance, mark 100+ way points you may want to find again, works as a compass to lay out straight lines etc.
I used my little hand held Garmin GPS when I went shopping for another semi tractor that had low enough gearing to pull a trailer out of a soft field. Instead of trying to paw my way through all the transmission and drive axle combinations to find what would work and how to identify it in a snowy truck lot. I used the GPS unit to measure the ground speed of my old truck at 1500 engine rpm in the lowest gear which was 3.8 mph.
When we found a truck we liked, we drove it in low hole at 1500 rpm and the GPS indicated the same 3.8 mph as our old truck which pulls well out of a field. figured that both engines had the same engine rpm range and the trans /axle ratio combination produced the same speed at a set rpm, so we should be good to go. |
Tractor add-on speedometer
