You are ignoring aerodynamic drag, which is inconsequential at the speeds achieved by off road construction machines.
Aerodynamic drag is an exponential function. It increases at an increasing rate as speed increases and is nearly always the factor limiting the top speed of race cars and aircraft. It is a basic law of physics that cannot be circumvented.
If you have spent much time around drag racers, you have no doubt heard the conventional wisdom that "torque produces a low ET (acceleration) and HP produces a high trap speed." Aerodynamic drag is the reason for the latter.
There is no way that 300 HP (or even 400) will push a 55 Chevrolet to 155 MPH absent a good downsloap and tornado.
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Today's Featured Article - Tractor Operator Safety - Loader & Backhoe Operation - by Staff. Loader Operation Do not transport anyone in the loader bucket. Always carry the loader bucket low for maximum stability and visibility, whether the bucket is loaded or empty. Always use the recommended amount of counterweihting to ensure good stability. Be careful when handling large objects such as round bales, logs,
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