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In aerospace engineering, mass ratio is a measure of the efficiency of a rocket.It describes how much more massive the vehicle is with propellant than without; that is, the ratio of the rocket's wet mass (vehicle plus contents plus propellant) to its dry mass (vehicle plus contents).
1959 July 28 – A Mercury boilerplate with instrumentation to measure sound pressure levels and vibrations from the Little Joe test rocket and Grand Central abort rocket/escape tower. 1959 September 9 – A Big Joe Atlas boilerplate Mercury (BJ-1) was successfully launched and flown from Cape Canaveral.
The Tsiolkovsky rocket equation shows that the delta-v of a rocket (stage) is proportional to the logarithm of the fuelled-to-empty mass ratio of the vehicle, and to the specific impulse of the rocket engine. A key goal in designing space-mission trajectories is to minimize the required delta-v to reduce the size and expense of the rocket that ...
Black powder rocket motors are only produced in small sizes, to reduce the risk of explosion and a loss of efficiency. Black powder rockets are produced in classes 1/8 A through F. Larger sizes of model rocket motors use ammonium perchlorate composite propellant, or other composite fuels that contain ammonium nitrate.
In rockets for a given target orbit, a rocket's mass fraction is the portion of the rocket's pre-launch mass (fully fueled) that does not reach orbit.The propellant mass fraction is the ratio of just the propellant to the entire mass of the vehicle at takeoff (propellant plus dry mass).
Characteristic velocity or , or C-star is a measure of the combustion performance of a rocket engine independent of nozzle performance, and is used to compare different propellants and propulsion systems.
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Only then would the pilot take control, aim and fire the armament, which was originally proposed to be a salvo of nineteen 55mm R4M rockets. [10] Later, 28 R4Ms or a number of the larger, 73mm Henschel Hs 297 Föhn rockets were suggested, [11] with either variety of unguided rocket fired from the Natter's nose-mounted cellular launch tubes. The ...