Motorcycle trailer tie-point geometry calculator

Calculate straight-line load-point to anchor length and signed inclination from horizontal toward anchor with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use straight-line load-point to anchor length and signed inclination from horizontal toward anchor to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Hypothetical common load-point x,y,z (same length unit)
0,0,1
Anchors: ID, x,y,z, supplied straight strap length in same unit
A,1,0,0,2 B,0,1,0,1.4
Straight-line load-point to anchor length
A: 1.41421356237; B: 1.41421356237
Signed inclination from horizontal toward anchor (degrees)
A: -45; B: -45
Plan azimuth toward anchor (degrees)
A: 0; B: 90
Supplied straight strap length minus geometric distance
A: 0.585786437627; B: -0.0142135623731
Anchors whose supplied length is below straight-line distance
B

Try another scenario

Hypothetical common load-point x,y,z (same length unit)
0,0,1
Anchors: ID, x,y,z, supplied straight strap length in same unit
A,1,0,0,2 B,0,1,0,1.5
Straight-line load-point to anchor length
A: 1.41421356237; B: 1.41421356237
Signed inclination from horizontal toward anchor (degrees)
A: -45; B: -45
Plan azimuth toward anchor (degrees)
A: 0; B: 90
Supplied straight strap length minus geometric distance
A: 0.585786437627; B: 0.0857864376269
Anchors whose supplied length is below straight-line distance
None
Calculation method

Calculation method

Straight-line load-point to anchor length

Euclidean norm of anchor−load-point vector.

Signed inclination from horizontal toward anchor (degrees)

atan2(delta z,hypot(delta x,delta y)); undefined at coincident points.

Plan azimuth toward anchor (degrees)

atan2(delta y,delta x); undefined when horizontal offset is zero.

Supplied straight strap length minus geometric distance

Signed length margin only; bends, routing and hardware are excluded.

Anchors whose supplied length is below straight-line distance

List negative geometric length margins; nonnegative margin does not certify restraint.

Symbols and units
a
Hypothetical common load-point x,y,z (same length unit)
b
Anchors: ID, x,y,z, supplied straight strap length in same unit

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • Hypothetical straight-line three-dimensional reach/angle geometry only. Load rating, restraint forces, friction, anchor strength, routing, vehicle motion and restraint certification are excluded; no tie-down configuration is approved.
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Further reading

OpenStax: ratios, unit rates and supplied measurement arithmetic ↗

Background reading; this does not imply endorsement or independent review of SumFizz.

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