Comparison - Twinstar Herve
Sea Level, 101,3kPa, 15°C

                               Twinstar Herve       Twinstar Herve       Twinstar Herve       Twinstar Herve       Twinstar Herve      

Motor                          Hyperion HP-Z2213-20 Hyperion HP-Z2209-32 Model Motors AXI     Model Motors AXI     Model Motors AXI    
                                                                         AC2208/34            AC2212/26            AC2212/34           
  Motor Constant (rpm/V)       1025                 910                  1080                 975                  740                 
  No Load Current (A)          0,65                 0,55                 0,35                 0,45                 0,4                 
  Armature Resistance (Ohms)   0,102                0,18                 0,26                 0,21                 0,345               
                                                                                                                                       
Battery                        LiPo 3000            LiPo 3000            LiPo 3000            LiPo 3000            LiPo 3000           
  Series Cell Count            3                    3                    3                    3                    3                   
  Parallel Cell Count          1                    1                    1                    1                    1                   
  Cell Capacity (mAh)          3000                 3000                 3000                 3000                 3000                
  Pack Capacity (mAh)          3000                 3000                 3000                 3000                 3000                
  Cell Voltage (V)             3,7                  3,7                  3,7                  3,7                  3,7                 
  Pack Voltage (V)             11,1                 11,1                 11,1                 11,1                 11,1                
  Cell Resistance (Ohms)       0,015                0,015                0,015                0,015                0,015               
  Pack Resistance (Ohms)       0,045                0,045                0,045                0,045                0,045               
                                                                                                                                       
Speed Control (ESC)                                                                                                                    
  Resistance (Ohms)            0,003                0,003                0,003                0,003                0,003               
  Maximum Current (A)          0                    0                    0                    0                    0                   
  Number of ESCs               1                    1                    1                    1                    1                   
                                                                                                                                       
Drive System                   APC 9x6 E            APC 9x6 E            APC 9x6 E            APC 9x6 E            APC 9x6 E           
  Gear Ratio                   1,00:1               1,00:1               1,00:1               1,00:1               1,00:1              
  Propeller (in x in)          9x6                  9x6                  9x6                  9x6                  9x6                 
  Series Motors                1                    1                    1                    1                    1                   
  Parallel Motors              1                    2                    2                    2                    2                   
  Number of Propellers         1                    2                    2                    2                    2                   
  Blades per Propeller         2                    2                    2                    2                    2                   
                                                                                                                                       
Airframe                       Twinstar Herve       Twinstar Herve       Twinstar Herve       Twinstar Herve       Twinstar Herve      
  Wing Span (cm)               142                  142                  142                  142                  142                 
  Wing Area (dm²)              32                   32                   32                   32                   32                  
  Total Weight (g)             1424                 1454                 1460                 1484                 1484                
                                                                                                                                       
Static Predictions                                                                                                                     
  Current (A)                  14,9                 19,2                 22,3                 20,6                 11,0                
  Motor Voltage (V)            10,4                 10,2                 10,0                 10,1                 10,6                
  Input Power (W)              154,6                195,5                223,4                208,3                116,7               
  Input Power Loading (W/kg)   108,5                134,3                152,9                140,2                78,5                
  Power Loss (W)               28,4                 42,5                 69,5                 51,7                 28,0                
  Motor/Gearbox Output (W)     126,3                153,0                153,9                156,6                88,7                
  Output Power Loading (W/kg)  88,6                 105,1                105,3                105,4                59,7                
  Motor/Gearbox Efficiency (%) 81,6                 78,3                 68,9                 75,2                 76,0                
  Shaft Efficiency (%)         76,4                 71,8                 62,3                 68,5                 72,4                
  Motor RPM                    9088                 7689                 7706                 7749                 6413                
  Propeller RPM                9088                 7689                 7706                 7749                 6413                
  Static Thrust (g)            712                  1020                 1024                 1036                 709                 
  Pitch Speed (m/s)            23,1                 19,5                 19,6                 19,7                 16,3                
  Run Time (min:sec)           12:05                9:22                 8:05                 8:44                 16:18               
                                                                                                                                       
Flight Predictions                                                                                                                     
  Stall Speed (m/s)            7,8                  7,9                  7,9                  8                    8                   
  Optimal Flight Speed (m/s)   10,7                 10,9                 10,9                 11                   11                  
  Throttle for Optimal (%)     59                   59                   54                   57                   74                  
  Duration at Optimal (m:s)    36:28                34:44                31:01                33:27                42:10               
  Motor Temp at Optimal (°C)                                                                                                           
  Hands-off Speed (m/s)        12,1                 12,2                 12,2                 12,3                 12,3                
  Throttle for Hands-off (%)   64                   65                   59                   63                   81                  
  Duration Hands-off (m:s)     33:55                32:06                29:11                30:26                39:52               
  Motor Temp Hands-off (°C)                                                                                                            
  Best Rate of Climb (m/s)     3,13                 4,33                 4,42                 4,38                 2,06                
  Rate of Sink (m/s)           -1                   -1,01                -1,01                -1,02                -1,02               

Note: Motor performance calculations do not take ambient temperature and heating effects into account.

Generated by MotoCalc 7.09, 06/11/2005 08:45.