Ecalc 1.0 Headroom Calculator instructions: Here you will target 25-30% motor RPM head room.  Click Recommend My Pinion button to start with that pinion tooth count.  Experiment with gear ratios to see what head speeds will allow near 25%, then feel the difference in flight.   Please heed the warning messages; they are carefully thought out for your benefit.  :-)
by: Sam2b
  Use check boxes to override values.
Heli Size:
Lipo Cell Count:    
Motor KV:    Watts
Main Gear:    
Dual Stage:      
Motor Head Room %       Recommend 25% - 30%
Preferred Head Speed:   
            Disable Warn
WireCalc - click here.