velocity and a final velocity (m/s) consistent with that from Freeland for the same parameters above. Equation gives the magsail mass as 97 tonnes assuming 100 tonnes of payload mass using the same values used by Freeland of = 1011 (A/m2) and =6,500 (kg/m3) for the superconducting coil. Equation gives Force for the magsail multiplied by =4 for the Andrews/Zubrin model to align with equation definition of force from the Gros model. Acceleration is force divided by mass, velocity is the integral of acceleration over the deceleration time interval (yr) and deceleration distance traveled (ly) is the integral of the velocity over (yr). Numerical integration resulted in the lines plotted in the figure with deceleration distance traveled plotted on the primary vertical axis on the left and time required to decelerate on the secondary vertical axis on the right. Note that the MHD Zubrin model and the Gros kinematic model predict nearly identical values of deceleration distance up to ~ 5% of light speed, with the Zubrin model predicting less deceleration distance and shorter deceleration time at greater values of . This is consistent with the Gros model predicting a smaller effective area at larger values of . The value of the closed form solution for deceleration distance from for the same parameters closely tracks the numerical integration result. Specific designs and mission profiles In 1990 Andrews and Zubrin reported on an example for solar wind parameters one AU away from the Sun, with (m−3) with only protons as ions, apparent wind velocity =500 (km/s) the field strength required to resist the dynamic pressure of the solar wind is 50 nT from equation . With radius =100 km and magnetospheric bubble of = reported a thrust of 1980 newtons and a coil mass of 500 tonnes. For the above parameters with the correction factor of 3.1 applied to equation yields the same thrust and equation yields the same coil mass. Results for another 4 solar wind cases were reported, but the MHD applicability test of equation failed in these cases. In 2015 Freeland documented in detail an interstellar deceleration use case for approach to Alpha Centaturi as part of a study to update Project Icarus with =260 km, an initial of 1,320 km and ISM density kg/m3, almost identical to the n(H I) measurement of 0.098 cm−3 by Gry in 2014. The Freeland study predicted deceleration from 5% of light