Calculation Method for Turning Radius of Stand-on Stacker
1. Core Definition
Minimum Turning Radius (Rₘᵢₙ)：When turning at low speed with full steering, the radius of the trajectory circle of the outermost vehicle body (usually drive wheel or counterweight end). This is the standard value marked in manufacturer specifications.
Wheelbase (L)：Distance from the center of front drive wheel to the center of rear steering wheel (for 3-point support structure: distance from front axle center to rear wheel center).
Maximum Steering Angle (θ)：The angle between the fully turned rear steering wheel and the longitudinal axis of the vehicle body (common range: 75°–90°).
Front Overhang (X)：Distance from front wheel center to the vertical front wall of the forks.
Fork/Pallet Length (B)：Take the extension length of forks or pallet depth (e.g., 1200 mm).
Safety Clearance (a)：Normally 100 mm per side, to avoid collision and scraping.
2. Theoretical Turning Radius Formula (Common for 3-point Stand-on Stacker)
Most stand-on stackers adopt 3-point structure (dual front drive wheels + single rear steering wheel),the turning center is at the front axle center:
3. Aisle Width for Right-Angle Stacking (Actual Working Requirement)
3-Point Stand-on Stacker (Most Widely Used)
W: Vehicle body width (mm)
4-Wheel Stand-on Stacker
Aisle Width=R+X+B+a
Calculation Example (3-point type):R=1410 mm,X=400 mm,B=1200 mm,W=800 mm,a=100 mmThe calculated aisle width is about 3140 mm (3.14 m).
4. Key Practical Notes
Difference Between Specified and Actual Value: The turning radius marked by manufacturers is usually 50–100 mm smaller than the actual value. It is recommended to reserve an extra 100 mm margin for warehouse aisle planning.
Influencing Factors: Shorter wheelbase and larger steering angle bring smaller turning radius; 3-point structure has better flexibility than 4-wheel type.
Quick Estimation Range:
Turning radius of 3-point stand-on stacker: approx 1.2–1.8 m
Right-angle stacking aisle width (1200 mm pallet): approx 2.8–3.5 m
5. Quick Check & Application Steps
Extract parameters from product spec: Minimum turning radius R, Wheelbase L, Max steering angle θ, Front overhang X, Vehicle width W
Calculate turning radius by formula: R=L/tanθ
Calculate stacking aisle width with corresponding formula
Add 100 mm safety clearance finally
