This info comes from Mercuriell at archeli,
Here's the story and specs
As promised, the supply of spare parts of the first Joker was continued until the end of 2010. This first mechanics still enjoys great popularity. Over time, many requests were brought to my attention, to create a modernized machanics of the Joker 1. The concept of two-stage gear transmission with belt-driven tail has proved to be extremely reliable. So it made sense, parallel to the Joker 3 to create a 3D specialists, of which the performance standard is still something layered on top of the Joker.
The construction began in spring 2010 under the largest secrecy, since it simply does work better when no one knows about. So an intensive testing was possible for several months, during which many small changes have been included into the design. Such a large model requires a stabilization period, during which possible errors can be eliminated systematically.
A diabolo is a toy with which you can show tricks after some practice, like a 3D heli. A diabolo is however also a rifle-bullet for target shooting, which can be equated with speed flying. When the canopy was completed, a friend was present at the model aircraft field and he has a spontaneous third meaning when we looked at these: "That's the devil!" Anyone who even looks at the canopy closely will certainly discover what he means. This detail is to prevent the tearing of the hood in the area of the aileron servos by frequent removal, even apart, the hood fits impeccably into the Joker family. However, it is now more acute than in the front of its predecessor, clearly a few inches higher, and also with 118 mm at the widest point narrower.
If you see the model fly for the first time as an experienced pilot, the thick tail pipe immediately catches your eye. This is also at great distances or fast maneuvers extremely well perceived by the eye and gives the diabolo almost the appearance of a model with a fuselage. 112g light through the tail pipe in conjunction with the equally light tail rotor, very high rotation rates are achieved at the tail. Most striking however is the enormous bandwidth of the Diabolo. It can be flown with a slow turning motor or flown with a power engine to the limits.
Rotor diameter: 1,56 to 1,68m (Blade length:690-750mm)
Weight with 12s/5000: 4,8-5,2 kg
2-stage gear, helical spur gear
Gear ratio 1st stage: 1:3,1 bis 1:4,13
Gear ratio 2nd stage: 1: 3,17
Belt driven tail rotor
Tail gear ratio 1,5:1
Tail rotor diameter: 290-300 mm
Length with canopy: 1,38 m
Length without canopy: 1,27 m
Height: 39 cm
Landing gear width: 22 cm
Tail boom diameter: 30 mm
Hanging battery for high COG
Battery tray: 68(74)mm high, 64 mm width
Automatic belt tension over oil-pressure shock absorbers with adjustable spring rate
Hensleite TDR,Vibe90 SG E,Logo 600 SX