Turning radius update to come! Extra 7 degrees of steering angle for rear wheel steering (from 3 to 10 degrees)

[TickTock]

43.5ft (13.26m) current turning radius

What would the turning radius be if it was 10 degrees? Asking too much?

OK. Adjusting again. :-}I realized that for the outer wheel to get the full benefit of 10 degrees, the inner wheel would have to turn *more* than 10 degrees. Since 10 is the max and both wheels are controlled by the same linkage I think it is more accurate to compute based on the centerline of the truck. This means the vector of the rear of the truck is effectively the average of the outer and the inner when both are 10 degrees. The number, computed this way, comes to 39ft.

1. Construct a triangle from the point between the front ties, point between rear tires and the center of rotation per the diagram. C is center of front; B is center of rear; and A is center of the circle. Distance c is half of the current turning circle (21.75ft) minus half the width of the truck (3.325ft) = 18.425 ft ; b is distance between wheels (12.5ft); γ is the rear wheel angle (currently 90-3=87 degrees)
2. Given the values from step 1, solve for a (distance from rear wheel to center) using the Law of Cosines (shown above the diagram). --> a=14.2 ft
3. Now, using the same formula, but at point C solve for the front steering angle α. α=50.35 degrees
4. Calculate the angle β. 180-87-50.35=42.65 degrees with the current 3 degree rear wheel steer.
5. Increasing rear steer to 10 degrees makes β 180-80-50.35=49.65 degrees
6. Now using the Law of Sines, calculate the new distance c to the center of the front inner wheels. c/sin(γ)=b/sin(β) --> c=16.15 ft --> add half the truck width back in and double to get the new turning circle of 38.95ft (=2*(16.15+3.325))

39ft is still very good and beats all the competition but not quite as good as a typical sedan (~36ft) - that would have been crazy good.

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[FarAway]

 

[Cybertruck 1974]

Im curious if this will be a software update or a mechanical change of rear steering rack and controller to achieve the additional 7 degrees or what ever they choose?

 

[ideaXfactory]

Also could go tighter by changing the rotation amount each wheel.

 

[Woodrick]

Im curious if this will be a software update or a mechanical change of rear steering rack and controller to achieve the additional 7 degrees or what ever they choose?

Simply a matter of software.

 

[Bathbunny]

Anyone else find it strange that something like a turning radius is still being adjusted at this stage of production?

I was surprised by how small the max angle was, even at the slowest speeds. For tight maneuvering in parking lots or on rough trails, at very low speeds, I was expecting up to 15deg angle.
And perhaps that is still reachable, but Tesla is taking it easy, gauging the response of drivers, since fewer that 1% of drivers have had any experience with four-wheel steering.

 

[Wolfgram]

I was surprised by how small the max angle was, even at the slowest speeds. For tight maneuvering in parking lots or on rough trails, at very low speeds, I was expecting up to 15deg angle.
And perhaps that is still reachable, but Tesla is taking it easy, gauging the response of drivers, since fewer that 1% of drivers have had any experience with four-wheel steering.

I found the steering to be super easy and fast to adjust to. I think the full 10 degrees will be amazing!! Can’t wait for the update. ??

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