A subsonic ramjet is a almost as big a fuel hog as a rocket.
I can't parse that. I need numbers cos I'm an engineer. What does 'almost as big a fuel hog' mean?
I'd be interested if anyone has any hard numbers like ISP on subsonic ramjets.
From http://home3.inet.tele.dk/kennethm/ramjet/ramjet.htm
In particular figure 14: http://home3.inet.tele.dk/kennethm/ramjet/fig14.jpg
It's a diagram of pounds of fuel consumption per hour per pound of thrust. According to the graph 5 pounds of fuel gives a pound of thrust for an hour at 900 ft/s, which makes for an ISP of about 720 seconds at just under mach 1, and roughly 600 seconds at about mach 0.8. That's more than twice as good as a hydrocarbon rocket at this altitude.
-p
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