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I. Introduction henever a pintle injector related discussion takes place, TRW, now part of Northrop Grumman, is one of the first names mentioned. They deserve this recognition not only for the pioneer work started in the 60’s, that eventually led to a patent, but also because they have employed pintle injectors on hundreds of engines5, ranging from a 10-Newton thruster up to the experimental 3-mega-Newton Low Cost Pintle Engine (LCPE) 8. Drawings, extracted from the patent filled by GW Elverum and TRW7, are shown on Fig. 1. The original document describes the drawing on the left as “a perspective view, partially in cross section, of a coaxial injector” while the drawing on the right is described as “a view in cross section of an injector”. By the middle of the 60’s, independently from TRW work, but in a much more modest scale, the Brazilian Space Research Institute-INPE developed several versions of a 200 N …