Learn To Fly  
   
Reaching 6,000 feet:
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Submitted by: David K.

Fully upgrade everything. Go off the ramp normally at 6% resistance. Glide
for a few seconds to gain altitude, then drop to 3% or 4% resistance. Then,
use your rockets in small bursts to stay in the 130-150 mph range. You will 
continue to drop, but will be over 110 mph when your fuel is gone. Continue 
gliding, and when you begin losing height, drop resistance to 0% to build up
speed and get a good bounce off the water. Bounce, wait a moment, then drop 
resistance back to 0% again. You should get 6,000 feet before hitting the 
water a second time, bounce a second time to reach that height.