Super Power -- AXI Gold Line Double 5330/20 Outrunner

Special power unit based on two AXI 5330 motors was custom designed for aerobatic models of planes up to 16000g. Maximum burst power of this unit reach 6000Watts. DOUBLE AXI 5330/20 GOLD LINE is suitable for use with single propeller but is also ready for two contra rotating props.



Electric motors manufactured by Modelmotors are marked with name and numbers with slash. Name means type of motor (eg.: AXI - brushless 14-pole outrunner, MiniAC - brushless two-pole inrunner). First two numbers mean diameter of stator and next two numbers lenght of stator in mm. Simplified the bigger diameter and lenght the bigger power of motor. The number behind the slash is winding number. The lower winding number the higher RPM and current capacity.

•No. of cells: 10s Li-Poly
•RPM/V: 235 •Max. efficiency: 91%
•Max. efficiency current: 23 - 57A (>85%)
•Current capacity: 75A / 20s
•No load current: 1.8A - 3A
•Internal Resistance: 2 x 45m ohm
•Dimensions (Diameter x Length): 63 x 159mm
•Shaft diameter: 8mm / 32mm
•Weight with cables: 1150g

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Definetly recommended Motor

RC Smart 893 RPM/V Outrunner Brushless Motor is one great small motor that I have had on gliders and park models.I have had the motor for two years with no problems.Definetly recommended.

RC Smart 893 RPM/V Outrunner Brushless Motor

Specifications

• Rotational Speed: 893 RPM/V
  
  
• Continuous Current: 42A
  
  
• Max. Current: 50A
  
  
• Input Voltage: 8 - 23V
  
  
• Max. Efficiency: 98%
  
  
• No Load Current: 0.9
  
  
• Internal Resistance: 74m ohm
  
  
• Motor Dimensions (Diameter x Length): 37.1mm x 41.1mm
  
  
• Shaft Diameter: 3.93mm (Front and Back)
  
  
• Shaft Length: 12mm (Front) 8.7mm (Back)
  
  
• Input Battery Types: NiCd/ Nimh/ Li-po Battery
  
  
• Recommend Model: Airplane
  

Package Included

• 1 x 893 Outrunner Burshless Motor (with accessories & English Manual)

I brought this motor the internet(http://www.rcmodelland.com/)

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Understanding Motor Specifications

Haha~

Do you know different motor specifications's mean?

Today, i will tell you the motor specifications's mean.

Most electric airplanes either come with a motor or the manual will tell you exactly what size motor it needs. If you're converting from a brushed motor or glow engine to a brushless RC motor, understanding what these designations mean will be important.

1.)Voltage Constant
Kv is the "Voltage Constant". This is how many RPM's the motor turns for each volt applied. Actually, it's a tad less because even brushless motors aren't 100% efficient.
For example, if you apply 12volts to a 200Kv motor, it will turn at just under (12 x 200) 2400 RPM's.

2.)Torque Constant
Kt is the "Torque Constant". For all motors, Kt= 1355/Kv. You'll have to ask someone smarter than me where the 1355 comes from, cause I don't have a clue! Just accept it for what it is.
In a nut shell, this means the faster the motor spins for a given voltage (Kv), the lower the output torque will be (Kv).

Outrunners generally have a lower Kv, which in turn produces more torque at a slower speed for spinning those larger props. The opposite is true with inrunners.

3.)No Load Current
Io is the "No Load Current". This is the amount of current it takes to spin the motor with no prop.

For example, if your motor is pulling 25Amps, and the Io is 2Amps, then you really only have 23Amps turning the prop.

4.)Terminal Resistance
Rm is the "Terminal Resistance". This is the internal resistance of the motor measured in Ohms. The higher the Rm, the less efficient the motor is.

5.)Current and Power
The maximum current and power is what determines how large of a prop and what size plane can be used with the motor. Simply multiply the current by the battery voltage to get power.

The larger the propeller's diameter and pitch, the more current the motor will draw for a given RPM. For example, the 200Kv motor will run at 2400 RPM's regardless of whether it has a 10x6 prop or a 11x5 prop. But, the 11x5 prop will cause the motor to draw more current. Drawing too much current will destroy the motor.

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Inrunner motor & Outrunner motor

There are two types of brushless RC motors for RC Helicopter, Inrunner motor and Outrunner motor .The permanent magnets of inrunner brushless motors are positioned on the inside of the electromagnets.

Inrunner brushless motors are set up very similar to the canned motor explained above, except the permanent magnets and electromagnets are in opposite positions.

An outrunner brushless motor has the permanent magnets on the outside of the electromagnets. You can see in the picture to the right that the outer hub holding the permanent magnets has the output shaft attached in the center.

Inrunner Brushless Model Aircraft Motors
The faster a motor spins, the more efficient it is. Inrunner motors turn very fast and are much more efficient than outrunner motors. Inrunner brushless RC motors require a reducing gearbox between the motor and propeller of your RC airplane. For this reason, the output speed and torque of the propeller can easily be "tweaked" to facilitate different flying characteristics by using different size gears.

The downside is added parts that can and do fail. The gears get stripped, and the gearbox shafts are easily bent. It can also be an obstacle when mounting the gearbox motor combination for your RC airplane neatly, especially under a cowling.

Inrunner vs Outrunner

Outrunners motor
# Low RPM's, high torque
# Less efficient than inrunners
# No gearbox required
# Narrow prop selection
# Silent

Inrunners motor

# High RPM's, low torque
# More efficient than outrunners
# Require a gearbox
# Wide prop selection
# Noisy

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