Czech Republic - Libcice - Tursko (GFS 27 km 21.05. 00 UTC)
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08h 11h 14h 17h 20h 08h 11h 14h 17h 20h 08h 11h 14h 17h 20h
Wind speed (m/s) 2 1.6 1.9 2.2 3.3 5.5 6.5 7 6 5.2 3.7 3.9 3 3.3 3.1
Wind gusts 3 2 2.1 2.5 5.9 11.8 10.3 10.4 10 11.8 9.2 7.3 4.8 5 5.6
Wind direction ESE E NE WNW WSW WNW NW NW NW WNW WNW NW NNW NNW N
Temperature (°C) 12 16 18 19 16 14 15 15 13 11 9 11 15 17 14
Rain (mm/3h)     0.4 2 2.3 1.1 1.1 0.4 0.4 0.7          

Emax GT 2215/12

  • Size: 28,5 x 335 mm
  • Shaft diameter: 4 mm
  • Weight: 70 g
  • Max. current: 18A
  • rpm/1V: 905
  • Num. of cells: 2-3 Li-pol
  • Recomended model weight: 300-1100 g
  • Recomended prop. without gearbox: 10X4,7 , 11x3,8
  • Price: $25
cells rpm./V APC rpm max. current thrust
3S 905 10x4,7 7450 15A 1000g
3S 905 11x3,8 7000 18A 1050g

I happened to found in one online shop the motor Emax GT series. Because I have a pretty good experience with the Emax motors , I decided to test it for TwinStar. The engine is look more massive than the EF series which I have used before, it has the shaft diameter of 4mm and packaging includes all necessary accessories. The box is made from rubber coated pappier, which gives the impression of a luxury product. Motor with all the parts are stored in a rubber molding that provides maximum protection in transit.

Krabička a gumové pouzdro

motor a příslušenství

In the box we will find motor with soldered 3.5 mm power connectors, connector counterparts, classic propeller adapter, set for reverse motor mount and set of screws. The motor has a specialness, as you can see in the picture, before using a set of reverse mounting you must first unscrew the special rotor cap and on its location put a special propeller driver. When using the front propeller driver you can leave the cap as is. I Have no idea, what is the purpose of this.

 

Pohled na rotor

stator a hřídel, vinutí vypadá obvykle u této značky

odejmutá krytka rotoru před montáží unašeče ze sady pro zadní montáž

namontovaný unašeč

Použil jsem matici z klasického unašeče, závit je stejný

I used to motors for TwinStar II and vibration problem seems to disappear. Lower rotates per minute, massive construction, the shaft diameter 4mm and precise propeller adapter for reverse mounting is a great premise for a quiet and smooth running. I used the recommended propeller 10x4, 7 APC SlowFlyer. I did not measure thrust, but current is approximately equivalent to  information from the manufacturer.

My result is, i'm satisfied with it.