Estimate Electric Motor & Prop Combo
Last updated: June, 6 - 2016
  BATTERY :   - Select an Item from the Dropdown-List or select "Custom" to enter your own data -
   Series       Parallel
 
  Cell Capacity              Max Current
   mAh          A
  Volt per cell
   V
  Cell Weight
   oz       g
  Cell Resistance
   ohms
  Pack Voltage
   V
  Pack Weight
   oz       g
  Electronic Speed Controller ESC :
 
   ESC Resistance
   ohms
  Max Current
   A
  ESC Weight
   oz       g
  MOTOR :
       
  Kv
   rpm/V
  Io
   A     @ V
  Rm                            Kt
   ohms         InOz/A
  Max Current
   A
  Motor Weight
   oz      g
  PROP :
  No of Blades    :1 Gear Ratio
  Constants
   Kt       Kp
  Diameter
  in      cm
   Pitch
   in      cm
  Enter the Ambient Temperature and Altitude   ( or the Barometic Pressure ) :
  Temperature
   F
      C
  Altitude
   ft
     m
  Barometric Pressure
   inHg
   mbar
- Click on screen after entered new values -
  MOTOR Results :
  Input Power
   W
  Volts to Motor
   V
   Motor Static RPM
   rpm
  Output Power       Max Output Power
   W          W
   Motor Current
   A
   Static Efficiency       Max Static Efficiency
   %              %
PROP Results :
  Prop Static RPM
  rpm
   Static Pitch Speed
   mph    Km/h
 Unless it's a glider the Static Pitch Speed
 should be >2.5 times the Plane's Stall Speed

  Prop Static Tip Speed
  MACH (max rec 0.92)
   Apprx. Max Level Flight Speed
   mph    Km/h
   Static Thrust
   oz     g
  Full-throttle duration
   minutes
 
   Power System Weight +10%
   oz       g
 

Static Thrust should be >1/3 of All Up Weight
To ROG, Static Thrust should be >1/2 of AUW
Copyright © 2004 - 2016, Adam one
Plot Efficiency - Output Power - Thermal Power and RPM vs Current based on setup above :
Efficiency (%)       Output Power (W)       Thermal Power (W)       RPM x 1000
Amps
Disclaimer: The calculated values are only approximate.
The calculations are based on certain assumptions of battery, esc and propeller performance.


Calculate Wing Loading & Stall Speed
  Wing Area:  if you don't know the area click here
   sq.in     sq.dm
  Aircraft Weight:
   ounces     grams
  Wing's Max CL:
   CL
  WING LOADING:
   oz/sq.ft     g/sq.dm
  STALL SPEED:
   mph     Km/h
  CUBIC LOADING:
   oz/cu.ft.
  
 
  


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