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Sport Planes (Formerly I/C & Gas Conversion) Discuss I/C or Gas Conversions, Aerobatic Planes and Sport Aircraft

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Old 07-27-2006, 02:50 PM   #1
Saint Maurice
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Exclamation Which electric motor is equal to what glow engine?

Q) How do you tell which Electric Motor is equal to what Glow Engine?
A) One of the biggest confusions for most people selecting an electric motor is, “What is a watt?” The glow guys are used to horsepower and electric power systems are measured in watts.

(1 hp = 746 watts or about 750 watts)

Don't go by the max rating for HP that engine manufacturers publish. That is a MAX figure and very seldom is an engine for sport use operated at that figure. The h.p. drops off quite a bit when the RPM is not at the rated figure which is usually around 16,000 RPM’s or greater.

Glow Engines vs. Electric Motors
  1. ♠ .20-size glow engine / 300w electric motor
  2. ♠ (OS Max 0.20 engine develops 0.4 hp = 300w electric motor (AXI 2820) )
  3. ♠ .35-size glow engine / 500w electric motor
  4. ♠ (Fox 0.35 stunt engine develops 0.7 hp = 522w electric motor)(AXI 2826)
  5. ♠ .40-size glow engine develops 1.0 hp = 750w electric motor (AXI 2826 or 4120)
  6. ♠ .60-size glow engine develops 1.3 hp = 975w electric motor (AXI 4120 or 4130)
  7. ♠ .90-size glow engine develops 1.6 hp = 1200w electric motor (AXI 5320 or 4130)
  8. ♠ 1.20-size glow engine develops 3.0 hp = 2250w electric motor (AXI 5330)
  9. ♠ DA-50 develops 5.0 hp = 3750w electric motor (AXI 5330)
  10. ♠ DA-100 develops 9.8 hp = 7311w electric motor (Double AXI 5330)
See E-flite Park 400 and Power 60 series that mimic replacement sizes for old brushed motors and glow engines.

Himax Brushless Motors

HC50 Outrunner 800-1500 Watts HC50 - These motors are for large models weighing 6-8Lb for 3-D flight, 8-15Lb for aerobatic flight and 10-20Lb for leisure flight.
Gas equivalent - .46 - .90

HC63 Outrunner 1700-2200 Watts HC63 - These motors are for large models weighing 10-12Lb for 3-D flight, 17-22Lb for aerobatic flight and 22-30Lb for leisure flight.
Gas equivalent - 1.20 - 1.80


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Old 08-01-2006, 02:33 PM   #2
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All posts in this thread were moved to duplicate thread in power systems.

Please do not double post the same thread in two different forums.

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