COMPACT 260 8,4 V Graupner 7707 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 8.4 V
Operating voltage range 7.2 ... 12 V
No-load speed 9100
Revs. / Volt 1080
No. of winds 34
Current drain at max. efficiency* 4 ... 7 A
Maximum efficiency 84%
Permissible direction R and L
No. of poles 14
Overall length approx. 38 mm
Case length, excl. shaft 26 mm
Diameter approx. 27.7 mm
Free shaft length approx. 12 mm
Shaft diameter 3.17 mm
Weight approx. 45 g
Recommended propellers 2945.18.11 8.4 ... 11.1 V or 2945.20.11 9.6 ... 12 V
Propeller adaptor 7690.3
Flexi-hub 7690.1
Motor mount*** 7690.2
All-up model weight approx. 270 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 to the speed controller used.
** with press-fitted pinion.
*** especially for power models.
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