Message posted by Kurt on August 13, 2009 at 11:21:57 PST:
I have to correct myself. As per the following Both scramjets and combined cycle engines use fuel pumps. Present state-of-the-art scramjets (the X-51) probably do not run long enough (less than 5 minutes) that fuel pump wear would be a problem. From my experience endurance testing involves many hours and/or cycles. Therefore, while the PWA-536 additive may not necessarily suggest a complex engine, it does suggest something operational.
(http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA186752&Location=U2&doc=GetTRDoc.pdf), "PWA-536 is used in JP-7 to prevent excessive wear of the engine fuel pump" and "One other fuel lubricity additive is PWA-536, a proprietary additive procured to a Pratt Whitney Aircraft specification. This additive is used in JP-7 jet fuel at a concentration of 200 to 250 p/m by weight. The effectiveness of PWA-526 was based on fuel pump endurance tests conducted at 149 C."
In Reply to: JP-7 - Detailed Research - Part II posted by Kurt on August 13, 2009 at 10:59:48 PST:
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