(Text needs modification) taken from http://henseleit-helicopters.de
After delivered the TDR-II, pilots came often to me, asking for another helicopter close to the TDR, but technically up to date.
The TDR impresses by simpleness and was one of the most powerful and variable helicopters for years.
It was important for me, to have a machine in range , which can be flown with less powerful and cheaper drive components, but with lots of fun.
Not only the weight is a big difference also the cost of a monster ESC and motor and huge flight packs are exceeding the cost of the TDR-II may times over. For the new machine the components should be possible to use much cheeper and lighter components.
This results in a light but stiff mechanic. Even the original TDR build in 2009 full filled this demands. But it was the time of using stronger and stronger drives and the weight went up and up. This result in 700 Helicopters which have a weight clear over 5kg.
The playful flying was lost over the time.
So I decide , that after developed TDR-II / TDS for extreme powerful flying, its time to go – back to the roots – and develop a new helicopter for everyone.
My goal was a helicopter for fun flying, possible to use with simple components, but able to fly all figures the pilot want to. It should als be possible to build powerful motor equipment for more extreme flying.
It should not be a face lifted TDR only but a totally new designed machine, with a lot of technical solution in, which I developed over the years and complete new solutions as well.
Weight should be lighter than the old TDR – which makes it necessary to construct with cleverness, not to loose stableness or quality.
With this new helicopter I followed my principles to implement trends, different from usual constructions and follow new paths.
The result is the TDFun.
TDF is the new 700 size helicopter for all pilots, which like a light weight agil 3D helicopter, build up clear and simple – but having all necessary features which are recommend in a high-end helicopter.
A fun machine which impresses by its flying simplicity – even without monster motor systems.
During development the weight was always in focus – but also the technical refinement of a Henseleit helicopter was newer lost. So the 700 size TDF presents itself with canopy by an empty weight of approx. 1800g.
Finished in the lightest version – with Midi size servos, JIVE ESC, PYRO 650 motor, as well as 6 or 7S flight pack (about 800g) – his total weight is about 3650g – which is lower than most 600 size helicopters.
Equipped with the most powerful components – standard HV servos, KOSMIK ESC and PYRO 750motor, as well as 12S flight pack – the total weight is approx. 4700g, safely under the 5kg border.
His gear in one step and the construction with the one way drive and tail gear drive inline with the motor shaft result in a extrem easy and clear construction of the drivetrain. Different motors and flight packs allows to fly the TDF smooth but also as a hot 3D machine. The gear ration is not changing.
My design of the LDS (Linear-Drive-System) is also realized in the TDF. Due to more space than in the TDR-II, it could be kept very simple. This system has so many advantages that I do not want to miss it any more.
TDF allows to use the linear drive system with normal servos. Also the smaller, half price midi size servos are able to handle the necessary force. There force of 8kg is plenty enough for this helicopter – precise controlling makes precise flying – thats 3D-Fun.
Due to the helical gearing of the one step main gear and the toothbelt drive tail gear the TDF is very quiet und clear in construction. So easy to maintain.
Some parts of the TDF loyal Henseleit customers will know from the TDR and the TDR-II.
So the canopy is the same as it is for TDR, as this design is still nice and aero dynamic – with good visibility – nothing to improve.
A new decal design changes the view, but also the old design can be used if wished. TDR-II design has to be modified a bit, but can than also be used. TDR customers can also use there existing canopies – it fits without changes.
The approved main rotor of TDR II has been modified for 12mm main rotor shaft and 8 mm feathering spindle, to save weight. The adjustable damping was implemented – so adjustments can be done on the field in seconds.
TDF will be available August 2017. It costs 1100€ incl. VAT.
It is possible to place an order already now. Please order in our shop by paying a non refundable deposit of 200€. The August batch is sold out. Please refer on actual delivery in our web shop
|TDF (Tree Dee Fun)
|Manufacturing and sales
|Main rotor diameter
|up to 1600 mm
|680 – 720 mm
|Recommended rotor blades
|710 mm / 175 – 210 g
|Tail rotor blades
|up to 110 mm carbon blades
|Empty weight of the mechanic
|approx 1800 g
|Total weight – depending on used components
|3.6 – 4.8 kg
|Total length – tip of canopy to end of tail
|Maximum width of skits
|Maximum width of canopy
|PYRO 650 – 78 (6S setup)
PYRO 650 – 65 (7S / 8S setup)
PYRO 700 – 52 (for 10S)
PYRO 700 – 45 (for 12S)
Maximum motor PYRO 750 – 45 Competition (for 12S)
|JIVE PRO 120+ HV
KOSMIK 160+HV depending on motor and flight syle (recommended only for PYRO 750 motors)
|Gear ratio main rotor to tail rotor
|1 : 5,56 (tail rotor is running during auto rotation)
|Gear ratio motor to main rotor
|9,27 : 1
|Maximum flight pack size (L x W x H)
|340 mm x 60 mm x 62 mm
When using 6S or 7S, the flight pack should be a weight of minimum 800 g.
|Recomended servos and some general things
|In gereral al standard servos can be used, but the TDF can also be flown with mid size servos due to his weight and Linear Drive System, as 80 Ncm torque is more than enough.
Normally these servos are only half in weight of standard ones – so a total saving of about 160 g is possible.
Important is, tha there is no play in the servo and that the are precise in finding and holding their position.
The enormous torque of up to 300 Ncm, the manufacturers are beating each other, I believe in substantial exaggerating. Servos with more than 150 Ncm using in this helicopters are not useful.
Even with 3 mid size servos the swash plate is pushed with nearly 25 kg (2 ½ baskets of water).
Considered that the rotor blade with cyclical pitch and 1800 RPM on the main rotor change from one side to the other about 30 times a second – you can imagine that the forces cannot be as high, as the stud bolts would not stay in the plastic ball link if the force would be as high.