 When the mass fluctuation is generated locally, as it must be for any propulsion device since fluctuations in distant objects cannot be controlled, the effect is a high order term that is too small to be used for propulsion or be measured in a laboratory.The following has been detailed by Woodward in various peer-reviewed papers throughout the last twenty years.According to Woodward, a transient mass fluctuation arises in an object when it absorbs "internal" energy as it is accelerated.