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Propulsion unit for the 3D models.

(wingspan around 1 250mm and an approximate mass/weight 1 250 grams)

 

The propulsion unit has been tested in the Extana model. We use one of the lightest motors on the market which, combined with the LiFe accumulators, provides a good power reserve.

 

The JETI Spin 44 controller is capable to power the receiver with five servos. Another important feature of this controller is the possibility to set the cut-off (switch off) voltage at the end of the discharging (i.e. before the accumulator is fully depleted). By setting a higher cut-off voltage we ensure a sufficient amount of energy remaining in the accumulators for the landing manoeuvre. This feature is essential for the LiFePO4 (System A-123) accumulators.

 

The actually tested and proven setup of the JETI Box controller

for 4 x LiFePO4

  

  • Brake                                     Off

  • Operation Mode                   Aircraft

  • Timing                                   23

  • Frequency                             8kHz

  • Acceleration                         1,5s

  • Acc Type                               Li-Ion, Li-Pol

  • Number of Cells                   4

  • Cut Off V Per Cell                2,8 V

  • Off Voltage Set                    11,2 V

  • Cut Off                                   Slow Down

  • Initial Point                            Auto

  • End Point                              1,80 ms

  • Throttle Curve                       Linear

  •  

The price of the power unit is very favourable. The base reason is the use of the LiFePO4 accumulators, as they make possible to operate the model with only one accumulator set. The average charging time is about 15 minutes.

 

 

The table shows the most important data, helping us to choose a specific kind of accumulator.

The measurements have been carried out usually twice, to cover the two typical modes of use - the frequent hard throttle excursions for the adrenaline-type of flying and the gentler kind of power control for the sedate, leisurely style of flying.

 

           Flight measurement, EXTANA (wingspan 1250 mm) JETI SPIN 44 power unit     
                           
  MOTOR        ACCUMULATOR          MODEL     MĚŘENÍ - JETI SPIN 44  
           1 cell   Pack     ENERGY  Pack       MENSURATION - JETI SPIN  
Motor  Motor Weight RPM/V Type Number of Cells  Voltage V   Voltage V  Capacity mAh  W/h  Pack Weight Model Weight Propeller Time of Motor Run  Max. Current Max. RPM
                             
PJS 1900 132 1038 LiFe 4       3,3         13,2   2300     30,4   288 1266 APC 12/6 7:32 46,9      12 010  
PJS 1900 132 1038 LiFe 4       3,3         13,2   2300     30,4   288 1266 APC 12/6 8:21 41,9      11 570  
                             
PJS 1900 132 1038 LiFe 4       3,3         13,2   2300     30,4   288 1266 APC 13/6,5 7:00 50,6      10 410  
                             
PJS 1500 132 765 LiFe 5       3,3         16,5   2300     38,0   360 1338 APC 13/6,5 7:45 37,9      10 830  
PJS 1500 132 765 LiFe 5       3,3         16,5   2300     38,0   360 1338 APC 13/6,5 10:29 37,3      10 770  
                             
PJS 1500 132 765 LiPol 4       3,7         14,8   2500     37,0   258 1236 APC 13/6,5 9:39 32,9        9 860  
                             
PJS 1900 132 1038 LiPol 3       3,7         11,1   3700     41,1   288 1266 APC 13/6,5 10:35 52      10 650  
PJS 1900 132 1038 LiPol 3       3,7         11,1   3700     41,1   288 1266 APC 13/6,5 10:58 48,6      10 410  

 

The propulsion unit contains

  • 1 x PJS 1900 motor

  • 1 x JETI Spin 44 controller

  • 1 x JETI Box

  • 1 x propeller adapter

  • 1 x APC 12/6 propeller

  • 4 x LiFePO4, A123 accumulator

 

 

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