Calculate Port Timing from Port Height and Vice Versa

Thanks to Callum Agnew

Length measurements can be metric or Imperial (US)

Stroke:		Enter the stroke
Rod Length:		Enter the Conrod Length
Height:		This is the Port Height Above BDC
Duration:		This is open duration of the port in degrees

After entering the stroke and rod length, enter: (a) the port height and click "Calc Duration" to get the duration or (b) enter duration and click "Calc Height" to get the port height.