ElECtRosPRAY emitters use a conductive liquid to produce an electrified meniscus from which charged droplets and/or ions are emitted. Electrostatic stress and capillary pressure are in equilibrium along the meniscus, naturally forming a cone-like fluid volume. At the tip of the cone, the electrostatic stress overcomes capillary pressure to form a fine, highly accelerated jet. If the electric stress is sufficiently strong, it can overcome intermolecular forces to emit ions from the free surface. Additionally, electrospray propulsion can achieve high efficiency operation due to the pre-ionized state of the ionic liquids, which are typically used as propellant. On the contrary, electrospray devices are susceptible to unstable emission modes when operated at off-nominal flow rates or extraction voltages. Whether a capillary, porous media, or externally-wetted surface is used to form an electrospray, the emitter geometry is selected to produce the desired performance. Ionic liquid electrospray thrusters are unique in that they have been developed over a wide range of specific impulse: from 200 s for the Colloid MicroNewton Thruster (CMNT) 1 to nearly 5000 s for porous emitters. 2 A single electrospray device that can operate over this large performance range however remains elusive. The objective of this project is to develop an electrospray thruster capable of both a high specific impulse mode and a high thrust-to-power mode at separate operating conditions. To achieve this goal, we have developed a new electrospray emitter geometry capable of operating stably over a wide range of flow rates.