Fuel efficiency ( known as specific impulse in rocket engines ) peaks at about 3500 seconds within the atmosphere.
42.
This mixture ratio not only governs the size of each tank, but also the specific impulse of the rocket.
43.
It would have provided nearly ( vacuum ) and had a specific impulse ( Isp ) of 448 sec.
44.
Hydrazine eventually replaced hydrogen-peroxide monopropellant thruster applications primarily because of a 25 % increase in the vacuum specific impulse.
45.
The higher the specific impulse, the less propellant is needed to produce a given thrust during a given time.
46.
Due to the specific impulse varying with pressure, a quantity that is easy to compare and calculate with is useful.
47.
Specific impulse values from 200 seconds to several thousand seconds are possible by choosing the propellant and laser pulse characteristics.
48.
These values are used in equations similar to the rocket equation and are analogous to specific impulse or exhaust velocity.
49.
He realized to do this he would need to use high specific impulse liquid hydrogen / liquid oxygen rocket engines.
50.
This direct relation is not generally present for airbreathing engines, and so specific impulse is less used in the literature.
