trex 450 3dx hdx all 450 heli diameter 12mm tail boom special 45 degree update set:
package included: 
2pc carbon fiber tail boom ( 1pc long, 1pc short)
2pc tail control rod( 1pc long , 1pc short)
2pc belt plus CNC 45 degree connecting special tail case.

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why develope this product :

     uplift the tail rotor to a high degree, it will be the same horizontal position as the main rotor blades, can counteract helicopter hovering inclination to one side, will let heli hovering more stable .

You can see more real helicopter use the same way .

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more application reference pic:

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