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.
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.
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.