PPRuNe Forums - View Single Post - Pratt & Whitney J58 vs General-Electric J93

barit1 · 11th Mar 2012, 01:10

Ah yes. Some years ago I worked some preliminary design stuff on such an engine - Low-bypass fan, twin spools, variable shutters to gradually close down core airflow and divert more to the afterburner, so the machine migrated toward a ramjet system. Similar in principle to what OldBUFFkeeper describes.

Very complex, but should have performed well past Mach 3. It could even be used as a reusable orbital-insertion booster vehicle with fly-home capability. NASA might be interested if they only had some $$$.

11th Mar 2012, 01:10	#35 (permalink)
barit1 Join Date: Feb 2005 Location: flyover country USA Age: 71 Posts: 3,885	Ah yes. Some years ago I worked some preliminary design stuff on such an engine - Low-bypass fan, twin spools, variable shutters to gradually close down core airflow and divert more to the afterburner, so the machine migrated toward a ramjet system. Similar in principle to what OldBUFFkeeper describes. Very complex, but should have performed well past Mach 3. It could even be used as a reusable orbital-insertion booster vehicle with fly-home capability. NASA might be interested if they only had some $$$.