Pete's  Planes
return to Homepage
return to Tech Index
 
Test Report      Electric Motors      98 to104 grams

   I recently acquired a Jamara Pro 480HS and a Wattage Super 400 Cobalt 27t and I have done preliminary tests.

  The results are in the table below, together with comparable data for five other motors tested previously.

   The motors are all of very similar weights and dimensions; all are tested with the same prop and at the same input power. The data presentation is designed to highlight the differences in efficiency.

   120 watts is a typical usable input power for these motors. Maximum powers will be higher, and will vary between motors, and will require higher currents and EMFs.

   Be aware of the limitations of this data.....Only one sample of each motor....Only one test point for each motor....Possible variability due to usage and timing....Hobby quality measuring equipment.

    Wattage super 400 Cobalt 27t Irvine cobalt 400 13t Jamara Pro 480 Jamara Pro 480 HS Graupner 480BB race Graupner 480 race 7.2

 

Graupner 480 7.2
Propeller   Master 6*4 Master 6*4 Master 6*4 Master 6*4 Master 6*4 Master 6*4 Master 6*4
Weight grams 98 104 104 104 102 102 102
Length incl'g bearings mm 53 50 52 52 53 53 53
Max Dia mm 29 28 29 29 29 29 29
Power IN watts 120 120 120 120 120 120 120
Current amps 16.1 15.0 12.2 16.9 18.7 17.4 13.4
EMF volts 7.5 8.0 9.8 7.1 6.4 6.9 9.0
Speed rpm 16000 15500 14900 15400 15100 15100 15200
Power OUT watts 77.4 70.8 62.4 69.0 65.8 66.0 67.2
Efficiency % 64.5 59.0 52.0 57.5 54.8 55.0 56.0