Acceleration and Deceleration
I would like to see my acceleration and deceleration. It would be cool to maybe have meters per second squared right under the speed display. However, you could have it where acceleration is displayed in green (ie. launch, prograde burn, gravity pull, etc.) and deceleration is displayed in red or maybe a negative sign (ie. retrograde burn, gravity pull again, entering an atmosphere, etc.)
It would be helpful in comparing how adding more weight to your rocket without adding engines or vice versa affects the performance.
This is now completed in SimpleRockets 2, which is now available for iOS, Android, PC, and Mac:
http://simplerockets.com/buy/now
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balducien commented
This would be a bit difficult. When you are standing on the earth, is your acceleration 9.81 m/s^2 or 0? When you hover five meters above the earth, what is it then?
You can already find out how fast the rocket accelerates (with full tanks). You have the thrust power in kilonewton and the weight in kg. You also have the gravitational acceleration of the planed you're on. The acceleration would be
(power of all the rockets combined in Newton)(weight in kg) - (gravitational acceleration) in m/s^2