Direct Fusion Drive (DFD) is a revolutionary fusion propulsion concept that would produce electric power and propulsion from a single, compact fusion reactor. DFD research is being supported by several NASA grants, including a Phase II NIAC grant and a STTR. This paper presents the latest work on modeling the thrust of the DFD engine. We present new magnetic field shapes for the scrape-off-layer, the critical region where energy from the fusion products is transferred to the propellant. The thrust model includes the relationship between the thrust, exhaust velocity, and efficiency obtained from numerical simulation of the scrape-off-layer. The paper includes a brief introduction to DFD before discussing the numerical tools and presenting results.