All the articles I have found show the VCCW engines using flat plate injectors. With the inherent combustion stability of a Pintle injector system, it would seem to be a better choice, yet I find no evidence that it was tried.

Does anyone have any references on this?

  • $\begingroup$ I can't find a source for this, but I suppose the radial speed component induced on the propellants by the pintle injectors would disturb the cooling vortex. $\endgroup$ – Rikki-Tikki-Tavi Oct 5 '14 at 1:08

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