Changes

Impulse (or total impulse) is defined as equal to force multiplied by time - it is a measure of how powerful motors are, and can easily give you your change in velocity (Impulse / Mass, assuming no drag or gravity losses. There will always be drag and gravity losses.) Total impulse can be thought of as the area under the thrust curve.

Impulse (or total impulse) is defined as equal to force multiplied by time - it is a measure of how powerful motors are, and can easily give you your change in velocity (Impulse / Mass, assuming no drag or gravity losses. There will always be drag and gravity losses.) Total impulse can be thought of as the area under the thrust curve.

[[File:L1_Guide_Thrust_Curve.png|400px|thumb|frame|center|Thrust curves of motors with the same total impulse]]

[[File:L1_Guide_Thrust_Curve.png|400px|thumb|frame|right|Thrust curves of motors with the same total impulse]]

In the above graph, each of those three motors have the same total impulse (area under the curve), but with very different thrust profiles. The letter designation for each motor (e.g. in E15, H125, or M1250) are a measure of total impulse and each successive letter represents double the total impulse.

In the above graph, each of those three motors have the same total impulse (area under the curve), but with very different thrust profiles. The letter designation for each motor (e.g. in E15, H125, or M1250) are a measure of total impulse and each successive letter represents double the total impulse.