G80-10T; no clue what the T means, the 80 means how long it burns(sec), the 10 means how long the delay is between the end of the thrust and activation of the ejection charge(sec), used for coasting to max altitude, G means engine type, classified by the total impulse (or power) produced by rocket. This is an Estes engine that is $56.99 -Rocket Man
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The strongest model rocket engines are typically classified by letter designations such as A, B, C, etc., with higher letters indicating greater power. For example, a model rocket engine designated as E or F would be considered strong in terms of power output. However, the strength of a rocket engine should always be matched with the appropriate size and weight of the rocket to ensure safe and successful launches.
AMMONIA
In terms of overall ruggedness, the C500.
A rocket's speed at launch is typically zero, as it starts from a stationary position on the ground. The rocket gradually accelerates as it is propelled by its engines, reaching higher speeds as it ascends into space.
—the Saturn v had two stages both parts would burn its engines until the fuel ran out then it would come off the rocket
Yes, the thrust on the rocket remains constant in the absence of gravitational force. Thrust is the force pushing the rocket forward, generated by the propulsion system. It is independent of gravitational force.