RE: Rivian doubles down with 765hp R1S SUV
Discussion
It'll be interesting to find out what the top speed of these truck is?
With any off road vehicle, providing maximum tractive effort at very low speed requires a high reduction ratio between the drive motor / engine and the wheels. Normally, a serious off-roader has a transfer case, which not only routes power forwards and backwards to each axle, but also provides a handy place to locate a second set of "low range" gears. Those gears typically provide a 2 x reduction (or more) to allow each tyre to be driven by a high torque.
In the case of these 'lecy trucks, with single speed gearboxes, there is no oportunity to have a large reduction without seriosuly limiting the top speed of the vehicle (ie like driving a normal 4x4 in low range the whole time). Therefore, probably the real reason that these trucks are what you might call excessively fast and powerful is simply because they needed to fit massively torquey drive motors to reach there tractive effort target........
With any off road vehicle, providing maximum tractive effort at very low speed requires a high reduction ratio between the drive motor / engine and the wheels. Normally, a serious off-roader has a transfer case, which not only routes power forwards and backwards to each axle, but also provides a handy place to locate a second set of "low range" gears. Those gears typically provide a 2 x reduction (or more) to allow each tyre to be driven by a high torque.
In the case of these 'lecy trucks, with single speed gearboxes, there is no oportunity to have a large reduction without seriosuly limiting the top speed of the vehicle (ie like driving a normal 4x4 in low range the whole time). Therefore, probably the real reason that these trucks are what you might call excessively fast and powerful is simply because they needed to fit massively torquey drive motors to reach there tractive effort target........
Max_Torque said:
It'll be interesting to find out what the top speed of these truck is?
With any off road vehicle, providing maximum tractive effort at very low speed requires a high reduction ratio between the drive motor / engine and the wheels. Normally, a serious off-roader has a transfer case, which not only routes power forwards and backwards to each axle, but also provides a handy place to locate a second set of "low range" gears. Those gears typically provide a 2 x reduction (or more) to allow each tyre to be driven by a high torque.
In the case of these 'lecy trucks, with single speed gearboxes, there is no oportunity to have a large reduction without seriosuly limiting the top speed of the vehicle (ie like driving a normal 4x4 in low range the whole time). Therefore, probably the real reason that these trucks are what you might call excessively fast and powerful is simply because they needed to fit massively torquey drive motors to reach there tractive effort target........
IIRC they said in the video that it had a 2 speed transfer arrangement With any off road vehicle, providing maximum tractive effort at very low speed requires a high reduction ratio between the drive motor / engine and the wheels. Normally, a serious off-roader has a transfer case, which not only routes power forwards and backwards to each axle, but also provides a handy place to locate a second set of "low range" gears. Those gears typically provide a 2 x reduction (or more) to allow each tyre to be driven by a high torque.
In the case of these 'lecy trucks, with single speed gearboxes, there is no oportunity to have a large reduction without seriosuly limiting the top speed of the vehicle (ie like driving a normal 4x4 in low range the whole time). Therefore, probably the real reason that these trucks are what you might call excessively fast and powerful is simply because they needed to fit massively torquey drive motors to reach there tractive effort target........
(goes off to watch video again)
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