 A resulting force suitable for Mach effect thrusters can then be calculated.While the Hoyle-Narlikar derivation of the Mach effect transient terms is done from a fully nonlinear, covariant formulation, it has been shown Woodward's transient mass equation can also be retrieved from linearized general relativity.Further research has shown that this term is only significant when mass-energy fluctuations are in the distant sources, many light-years away.