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Technical Data (English)

Production and distribution Henseleit Helicopters
Diameter main rotor 1600 mm to 1800 mm
Main rotor blades 700 mm to 800 mm
Recommended main rotor blades 713 mm to 750 mm / ca. 63 mm deep / 190 to 240 g

Blade grip 12 mm (optional up to 14 mm with different screw bushes)

Tail rotor blades 95 mm to 125 mm carbon blades
Empty weight of the mechanic 2,35 kg inclusive canopy
Take off weight – according to the used battery and power unit 5,6 kg to 6 kg
Length – tip of canopy to the end of the tail unit 1450 mm
Total height 350 mm
Maximum width of skids about 200 mm
Maximum width of canopy 110 mm
Recommended motor KONTRONIK PYRO 800-48

The best choice for this helicopter. This motor offers an amazing efficiency so that reasonable flight times will be achieved.

It also provides a lot of torque and runs very smooth. Power will be enough for 98% of the pilots and because of the perfect aerodynamic of the TDR-II the top speed is only pettily less than with the PYRO 850 Competition setup.

PYRO 850-50-Competition (recommended only for pure speed competitions)

Both motors are sold in a special edition. The shaft is shortened to 23 mm from the motor shield and is 8 mm thick at the end for the pinion.


Special version is sold with black anodised and rounded cooling gill.

Possible gear reduction ratios with the following pinions 13Z 14,66 : 1
14Z 13,61 : 1
15Z 12,71 : 1
16Z 11,91 : 1
17Z 11,21 : 1
18Z 10,59 : 1  ideal for PYRO 800-48 with 14s
19Z 10,03 : 1
20Z   9,53 : 1 PYRO 850-50 Speed setup / 14s
21Z   9,08 : 1
The pinions have got a 8mm hole, reduction bushes to 6mm are available
Transmission ratio main rotor to tail rotor 1 : 4,88
Transmission ratio intermediate shaft to main rotor 2,684 : 1
Recommended main rotor speed 1300 to 2300 U/min (Allround and 3D)
2000 to 2600 U/min (Speed)
V-max (during straight horizontal flight) Over 280 km/h (175 mph) with PYRO 850-50 Competition / 14S battery / Retractable gear / X 713 S – Rotor blades


Swash plate-Servos

Standard size HV-Servos

Torque between  150 Ncm and 200 Ncm are sufficient.

The servo drive shaft has to be compatible to Futaba servo shafts.

No servo levers are necessary. Special pinions will be mounted at the servo shaft.

To take all advantages of the new linear servo drive I recommend to use programmable servos at which the angle of movement can be rised.

Optimal movement is 55 degrees to each side when setting the transmitter to 100%. Measured with no stabilization system between receiver and servo.

At this time there are not so many manufacturers who offer such type of servos. I am sure that will change very quickly.

There is not only the advantage to rise the servo way by programming but also to have a soft start after connecting the receiver with the battery. So linkages and servos will be protected.

At this time I can recommend the new Hitec servos D945TW (and the Hitec servo programmer DPC-11).
For the tail I recommend the Hitec D940TW

Alternative you can use high voltage S-Bus servos from Futaba in the appropriate class.

Standard servos are usable as well. For this you will find different linkage connection positions at the blade grip arm.

Recommended batteries

The TDR-II is designed for 12S to 16S batteries which has to be divided into two packs.

The minimum battery weight of both batteries together should not be lower than 1,6 kg otherwise additional weight has to be added.

Maximum size of the battery packs is 45 x 60 x 160 mm or 50 x 50 x 160 mm.

If the batteries are shorter they can be a little wider but not over 62 mm.

If you are unsure send me the dimensions so I can check with my CAD-software if there are any collisions.


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