Flat Spiral Coil (can be used for length calculation of flat spiral coil)

Flat Spiral Coil (can be used for length calculation of flat spiral coil)

https://deepfriedneon.com/tesla_f_calcspiral.html

Length of Helical Coil - Spiral (can be used for length calculation of helical coil - spiral screw conveyor )

Length of Helical Coil - Spiral

(can be used for length calculation of helical coil -  spiral screw conveyor )

https://deepfriedneon.com/tesla_f_calchelix.html