SUMO/Misc Airframe Notes

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Misc Airframe Notes

MotoCalc is an Electric Flight Performance Prediction program for Windows and is available for a 30 day free trial. MotoCalc has an internal database of thousands of motors/props/etc. and can make power/flight predictions based on data input.

Electric Motor Calculator by Diversity Model Aircraft is a free online tool for matching props to motors to batteries.

Propeller Thrust Calculator is a free online calculator to give thrust from given propeller and RPM or vice versa.

MultiSurface Aerodynamics is an airfoil and wing analysis software package. The software predicts lift and drag for multiple interacting wings.

Battery Specs

Nickel Cadmium (NiCd)

  • Energy/Weight: 40-60 Wh/kg
  • Nominal Cell Voltage: 1.2V
  • Fully Charged Cell Voltage: 1.2V
  • Depleted Cell Voltage: 0.8-1.0V

Nickel Metal Hydride (NiMh)

  • Energy/Weight: 30-80 Wh/kg
  • Nominal Cell Voltage: 1.2V
  • Fully Charged Cell Voltage: 1.35-1.4 V (unloaded)
  • Depleted Cell Voltage: 1.0V

Lithium-Ion

  • Energy/weight: 160 Wh/kg
  • Nominal Cell Voltage: 3.6 / 3.7 V
  • Fully Charged Cell Voltage: 4.2V
  • Lowest Cell Discharge Voltage Before Damage: 2.4v to 3.0v

Lithium-Ion Polymer (LiPo)

  • Energy/weight: 130-200 Wh/kg
  • Nominal Cell Voltage: 3.7V
  • Fully Charged Cell Voltage: 4.23V
  • Lowest Cell Discharge Voltage Before Damage: 3.0V

Typical Power Requirements

  • 70W/kg (35W/lb) for sedate flying from hand launch
  • 100W/kg (50W/lb) for ground take off
  • 150W/kg (75W/lb) for performance / aerobatics


Mass Figures

Provided below are some weights to aid in estimating an all up weight for your uav

  • Tiny13 1.1 Weight: 25g (0.88oz)
  • IR Sensor Head: 5g (0.18oz)
  • XBee Pro: 4g (0.14oz)
  • Hitec HS-55 Servo: 8g (0.28)
  • Brushless Outrunner 250W: ~90g (~3oz)
  • FunJet assembled, no hardware: 165g (5.82oz)
  • FMA Encore 5ch Receiver: 11g (0.40oz)
  • Castle Creations Phoenix 35: 24.5g (0.9oz)