The trick to get 6000 feet, you first have to max out everything then when you just lift off, keep the wind resistance at 6% for few seconds then, make sure that the wind resistance is 4% and keep a constant speed of 140mph, tap space to use rocket when it hits around 138mph. After that, you should be around 5800ish when your rocket runs out, then move the wind resistance to 0% and just watch. Have fun (:.
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