Specific Impulse in a sentence

If an engine weighs more in order to gain a higher specific impulse, it may not be as efficient in gaining altitude, distance, or velocity as a lighter engine that has a lower specific impulse.

If mass is used, specific impulse is an impulse per unit mass, which dimensional analysis shows to have units of speed, and so specific impulses are often measured in meters per second and are often termed effective exhaust velocity.

The specific impulse of a photonic rocket is harder to define, since the output has no (rest) mass and is not expended fuel; if we take the momentum per inertia of the photons, the specific impulse is just c, which is impressive.

The specific impulse of various jet engines Rocketry In rocketry, where the only reaction mass is the propellant, an equivalent way of calculating the specific impulse in seconds is also frequently used.

Because the weight on Earth of the reaction mass is often unimportant when discussing vehicles in space, specific impulse can also be discussed in terms of impulse per unit mass.

LMP-103S has 6% higher specific impulse and 30% higher impulse density than hydrazine monopropellant.

The specific impulse is a measure of the impulse produced per unit of propellant expended, while thrust is a measure of the momentary or peak force supplied by a particular engine.

In many cases, propulsion systems with very high specific impulses—some ion thrusters reach 10,000 seconds—produce low thrusts. citation When calculating specific impulse, only propellant that is carried with the vehicle before use is counted.

Air resistance and the engine's inability to keep a high specific impulse at a fast burn rate are why all the propellant is not used as fast as possible.

Although liquid hydrogen delivers the largest specific impulse of the plausible rocket fuels, it also requires huge structures to hold it due to its low density.

An antimatter -matter powered photon rocket would (disregarding the shielding) obtain the maximum c specific impulse; for this reason, an antimatter-matter annihilation powered photon rocket could potentially be used for interstellar spaceflight.

Antimatter rockets main An antimatter rocket would have a far higher energy density and specific impulse than any other proposed class of rocket.

As an electric propulsion system, PPTs benefit from reduced fuel consumption compared to traditional chemical rockets, reducing launch mass and therefore launch costs, as well as high specific impulse improving performance.

As with other electric propulsion variations, both specific impulse and thrust increase with power input, while thrust per watt drops.

Candy propellants generate a low-medium specific impulse of roughly 130 s and, thus, are used primarily by amateur and experimental rocketeers.

Claire Soares, "Gas Turbines: A Handbook of Air, Land and Sea Applications", pp. 140. Specific impulse as a function of speed for different jet types with kerosene fuel (hydrogen I sp would be about twice as high).

Confusingly, both values are sometimes called specific impulse.

Currently then, for a solid core nuclear thermal rocket to be more useful than chemical rockets as a first or second stage Earth launch engine, the system would either have to be made much lighter, or provide even higher specific impulse.

Despite a modest increase in specific impulse, implementation is limited due to the increased hazards of the high-explosive additives.

Drives with a specific impulse that is both high and fixed such as Ion thrusters have exhaust velocities that can be enormously higher than this ideal for many missions.