Rocket Propulsion Elements Intro | Key Concepts & Study Guide
viscous having a thick, sticky consistency between solid and liquid; having a high viscosity
duct propulsion air breathing machines; turbojets and ram jets; type of jet propulsion;
energy conversion efficiency the ratio between the useful output of an energy conversion machine and the input,
in energy terms. The input, as well as the useful output may be electric power,
mechanical work, light (radiation), or heat.
the energy output, divided by the energy input, and expressed as a percentage. A
perfect process would have an efficiency of 100%. Wout = the work or energy
produced by a process. Units are Joules (J).
turbojet energy source and propellant chemical (d/p) + fuel and air
turbojet - ramjet energy source and propellant chemical (TFD) + fuel and air
ramjet (hydrocarbon fuel) energy source and propellant chemical (d/p) nuclear (TFD) + fuel and air
ramjet (h2 cooled) energy source and propellant chemical (TFD) + hydrogen and air
rocket (chemical) energy source and propellant chemical (d/p) nuclear (TFD) + stored propellant
ducted rocket energy source and propellant chemical (TFD) + stored solid fuel and surrounding air
electric rocket energy source and propellant chemical/solar (D/p) + stored propellant
nuclear fission rocket energy source and propellant nuclear (TFD) + stored h2
solar heated rocket energy source and propellant solar (TFD) + stored h2
photon rocket (big light bulb) energy source and propellant nuclear (technically feasible not demonstrated) + photon ejection - no stored
propellant
solar sail energy source and propellant solar (TFD) + photon reflection (no stored propellant)
Grade A+ | Updated
, Rocket Propulsion Elements Intro | Key Concepts & Study Guide
rocket engine thrust to weight ratio 75:1
turbojet engine thrust to weight ratio 5:1 turbojet and afterburner
ramjet engine thrust to weight ratio at mach 3 at 30,000 7:1
feet
mach 1 is equal to the speed of sound
mach .65 is 65% the speed of sound (subsonic)
mach 1.35 is 35% faster than the speed of sound (supersonic)
subsonic mach m < .8
transonic m .8 - 1.2
supersonic mach 1.2 - 5
hypersonic mach 5 - 10
high hypersonic mach 10 - 25
re-entry speeds mach mach > 25
mach calculated by velocity of the moving aircraft divided by speed of sound at that altitude
required speed for LEO mach 25.4
thrust to weight ratio a dimensionless ratio of thrust to weight of a rocket, jet engine, propeller engine, or
a vehicle propelled by such an engine that indicates the performance of the engine
or vehicle.
Grade A+ | Updated
viscous having a thick, sticky consistency between solid and liquid; having a high viscosity
duct propulsion air breathing machines; turbojets and ram jets; type of jet propulsion;
energy conversion efficiency the ratio between the useful output of an energy conversion machine and the input,
in energy terms. The input, as well as the useful output may be electric power,
mechanical work, light (radiation), or heat.
the energy output, divided by the energy input, and expressed as a percentage. A
perfect process would have an efficiency of 100%. Wout = the work or energy
produced by a process. Units are Joules (J).
turbojet energy source and propellant chemical (d/p) + fuel and air
turbojet - ramjet energy source and propellant chemical (TFD) + fuel and air
ramjet (hydrocarbon fuel) energy source and propellant chemical (d/p) nuclear (TFD) + fuel and air
ramjet (h2 cooled) energy source and propellant chemical (TFD) + hydrogen and air
rocket (chemical) energy source and propellant chemical (d/p) nuclear (TFD) + stored propellant
ducted rocket energy source and propellant chemical (TFD) + stored solid fuel and surrounding air
electric rocket energy source and propellant chemical/solar (D/p) + stored propellant
nuclear fission rocket energy source and propellant nuclear (TFD) + stored h2
solar heated rocket energy source and propellant solar (TFD) + stored h2
photon rocket (big light bulb) energy source and propellant nuclear (technically feasible not demonstrated) + photon ejection - no stored
propellant
solar sail energy source and propellant solar (TFD) + photon reflection (no stored propellant)
Grade A+ | Updated
, Rocket Propulsion Elements Intro | Key Concepts & Study Guide
rocket engine thrust to weight ratio 75:1
turbojet engine thrust to weight ratio 5:1 turbojet and afterburner
ramjet engine thrust to weight ratio at mach 3 at 30,000 7:1
feet
mach 1 is equal to the speed of sound
mach .65 is 65% the speed of sound (subsonic)
mach 1.35 is 35% faster than the speed of sound (supersonic)
subsonic mach m < .8
transonic m .8 - 1.2
supersonic mach 1.2 - 5
hypersonic mach 5 - 10
high hypersonic mach 10 - 25
re-entry speeds mach mach > 25
mach calculated by velocity of the moving aircraft divided by speed of sound at that altitude
required speed for LEO mach 25.4
thrust to weight ratio a dimensionless ratio of thrust to weight of a rocket, jet engine, propeller engine, or
a vehicle propelled by such an engine that indicates the performance of the engine
or vehicle.
Grade A+ | Updated
