Automatic transmissions and hyrostats have different applications. Hydrostatic transmissions are great when the demand for power is fairly constant, and there's not a lot of variation in speed. Open the throttle wide, pick the speed and go. An automotive transmission has to respond to much wider variations of power and speed. And it needs to respond almost instantly when there's a demand for power. Think about when you speed up to pass another vehicle: You need to simultaneously go to full throttle and downshift to a lower gear. An automotive automatic transmission will shift to the appropriate gear when more power is needed, and the driver just has to deal with one power control, the accelerator pedal. Now think about doing it with a hydrostat: You have to simultaneously open the throttle and reduce the transmission speed control, then increase the speed control as the vehicle accelerates. It's the same as you would do with a manual transmission, except you have to adjust the speed control constantly with a hydrostat rather than just make a couple of gear changes with the manual.
Modern automatic transmissions are ridiculously efficient. With as many as eight speeds plus torque converter lockup, they give up very little in efficiency to continuously variable transmissions, which is why CVTs haven't really taken off.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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