Medical Definition of coprophilia. : marked interest in excrement; especially : the use of feces or filth for sexual excitement.
A scramjet (supersonic-combustion ramjet) is a ramjet engine in which the airflow through the whole engine remains supersonic. The highest speed attained by a rocket-powered airplane, NASA's X-15 aircraft, was Mach 6.7. The fastest air-breathing, manned vehicle, the SR-71, achieved slightly more than Mach 3. The X-43A more than doubled the top speed of the jet-powered SR-71.
Thus for example a Delta II rocket can send a 1800 kg payload into geosynchronous orbit, using about 200,000 kg of propellant. The total rocket at launch would have a mass of about 232,000 kg. That's a lot of fuel! This is because 2 km/s (= 4500 mph) is considered low speed in Rocket World, so you have to achieve thrust by squirting lots of mass.