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Welcome to the StarkEffects.com Puzzle, Caltrops

This is an ancient weapon, but how would you put it into a modern CAD program in 3-D so you could have it manufactured?

Caltrops Puzzle

A caltrop can be formed with a sphere having 4 spikes protruding from it.

Every spike is exactly the same distance from every other spike.

What is the Angle Between Any Pair of Spikes?



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  • What is the Stark Effect?
  • The Chemistry of Love &/or Addiction
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  • Aristotle's Prior Analytics - the birth of Logic.
  • Optical Solutions, lenses that solve problems
  • Fractals
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  • 3-D Noise
  • Laser Primer
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  • Special Relativity
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  • Acousto-optic Cells
  • Harmonic Generation for Laser Frequency Doubling (SHG) and Tripling -using non-linear crystals.
  • Measurement: Accuracy & Precision.
  • Things you should know about computer modeling of physical phenomena!
  • Giant Magneto-resistance
  • Peltier Cooling
  • Pyro-Electric Detectors
  • Piezo-Electric Crystals
  • Laser Speckle
  • FFT and DFT the fast fourier transform and the discrete fourier transform
  • Fabry Perot Etalon
  • The Hydrogen Atom.
  • PCA (Principal Component Analysis)
  • Energy per mass in fuels such as Hydrogen, Gasoline, Kerosene, HMX etc...
  • Nobel prize winning work on the CCD
  • How does a CCD work and what are the normal characteristics of a CCD
  • Nobel Prize Winning work on Giant Magneto-resistance
  • FROG -frequency resolved optical gating
  • Optical Wavefront Sensing
  • THz imaging and time-domain spectroscopy
  • Camera Calibration
  • Laser Designators
  • Resampling

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