Similarly, with a pto-driven implement when engine speed must be kept constant, the control system can be instructed to achieve that with any change in load due to a slope or when moving into heavier soil compensated by altering ground speed
through the transmission ratio.
There was a hydraulic drive in each rear wheel and ground speeds were infinitely variable from 0 to 9 mph.
Sales literature stated a ground speed of 0.75 mph could be obtained in "special low" by throttling back the engine speed, which would result in a low idle speed of about 845rpm.
For this application, Magic Circle wanted to achieve a ground speed
of about 8 mph using a 20 to 27 hp motor at 3600 rpm, 23- to 24-in.
This is especially valuable when running 8- or 12-row cornheads at higher ground speeds
The attraction of infinitely variable transmissions in agricultural uses has always been providing the operator with literally an unlimited variety of ground speed
With the 5-speed transmission, speeds were 1.9 mph, 3.2 mph, 5.7 mph and 15.3 mph, providing adequate ground speeds
for tillage, general farming and a road gear.
Higher productivity of up to 25 percent comes from higher ground speeds
while using less horsepower, handling thick, tough crop materials with ease.
These limitations include wind effects and the challenge of rapidly changing application rates at aircraft ground speeds
that customarily approach 65 m/s.
The John Deere 615P Belt Pick Up Platform allows small grain producers to harvest bigger windrows at faster ground speeds
with fewer losses.
The electronically controlled hydrostatic transmission features cruise control that can maintain constant ground speeds
as low as 0.16 kph (0.1 mph).
The lock-up function activates in second, third and fourth gears and gives the machine a maximum ground speed
of 23.2 mph (37.3 km/h).