### engine list 1 - atomic rockets

Apr 03, 2021 · The equations for delta V and mass ratio are slightly different for a Solar Moth or Laser Thermal rocket engine: Δ v = sqrt((2 * Bp * Bε) / mDot) * ln[R]. R = e (Δ v /sqrt((2 * Bp * Bε) / mDot). where. Δ v = ship's total deltaV capability (m/s); R = ship's mass ratio; Bp = Beam power (watts) of either laser beam or solar energy collected; Bε = efficiency with which engine converts beam