Load case · indoor unit
BTU class presets (typical wall-mount head dimensions)
Geometry
HeadStand design
Business case
Strut force vs working gap
Solver log
Result
Reactions
Failure-mode checks SF target ≥ 3
Business case
These are assumptions. Joni's field ride-alongs replace them with measured times.
Model
Rigid-body statics: the unit pivots on the plate's top hook, and the strut pushes horizontally at the bottom-rear edge. F = W·xc / (H·cos θ), θ = asin(g/H). Buckling uses Euler with K = 2. Magnet shear = 25% of rated pull. Drywall allowable = 0.35 MPa. These are first-pass hand-calc models, not FEA. Validate them on the bench rig.