COMPACT 300 9,6 V Graupner 7709 GRAUPNER COMPACT BRUSHLESS motors.
A range of high-performance BRUSHLESS motors. The impressive feature of this series of power plants is their enormously high torque, and it is in direct-drive applications that they show their full power potential. GRAUPNER COMPACT motors are brushless external-rotor (out-runner) types, i.e. the outer motor jacket rotates and drives the motor shaft. This design principle resultsin ultra-compact electric motors capable of an outstanding performance without recourse to a gearbox. An additional advantage: the weight of GRAUPNER COMPACT motors is very low compared to that of conventional motors. Ultra-light GRAUPNER COMPACT motors with weights below 45 g, i.e. less than a SPEED 300 electric motor, and therefore an excellent choice for lightweight Depron or Styrofoam models. The preferred energy source is a 2-cell or 3-cell Li-Po pack. Nominal voltage 9.6 V
Operating voltage range 7.2 ... 12 V
No-load speed 7100
Revs. / Volt 740
No. of winds 34
Current drain at max. efficiency* 4 ... 8 A
Maximum efficiency 84%
Permissible direction R and L
No. of poles 14
Overall length approx. 42 mm
Case length, excl. shaft 30 mm
Diameter approx. 27.7 mm
Free shaft length approx. 12 mm
Shaft diameter 3.17 mm
Weight approx. 57 g
Recommended propellers 2945.28.12 7.2 ... 9.6 V or 2945.23.12 9.6 ... 12 V
Propeller adaptor 7690.3
Flexi-hub 7690.1
Motor mount*** 7690.2
All-up model weight approx. 300 g
Recommended speedcontroller Compact Control 8 2893 or Compact Control 10 2873 or Genius 30 2895
* Referred to operating voltage range. These values reflect the current state of technology, and may vary in the course of continued development.
Differences may occur according tothe speed controller used.
** with press-fitted pinion.
*** especially for power models.
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