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Old 06-10-2009, 12:17 PM
  #344  
dchin62973
 
Join Date: Jun 2008
Location: Smithtown, NY
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Default RE: Esky Honey Bee

    I also modified the E-SKYHBFP to run using an 11.1 volt LIPO. The main reason was after installing the super skids 300 landing gear system, the heat sinks on the main motor and tail motor, metal flybar rods, metal tail boom struts, metal rotor head core, titanum tail boom from super skids, ON/OFF switch, etc, the heli weighed in at about 13 ounces. A standard 7.4 volt LIPO could not lift the heli more than 2-3 feet above ground. The solution was to get a bigger 380 carbon brushed motor or use a larger battery. The problem with a 380 motor is that its RPMs are too high and will cause minor spinning as the tail motor cannot compensate. Not good when doing high speed flying or turning.

    My answer - Go to a brushless motor setup with an 11.1 volt LIPO battery. T
    he motors are lighter and more efficient than a regular carbon brushed motor. The carbon brushed motors heat up during flight and heat sinks are required. You also have to wait until the motor cools down before flying again otherwise risk the longevity of the carbon brushed motor. Brushless motors run luke warm to the to the touch. No more heat sink heats because the brushless motor are governed by an ESC. There is less strain on the Rx thus reducing RF noise and glitches.
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      No more fuses are required between the main motor and Rx since the ESC will bear the brunt of the backlash. The MOSFET circuit in the ESC should be able to handle most crashes without possible burnout to your RX. However, you still need an ATO 3 Amp Fast blow fuse for the tail motor since the tail motor is still carbon brushed. The typical 370 carbon brushed motor lasts on average about 150 flights using an 11.1 volt LIPO battery before burnout. A brushless motors has no brushes to wear out. Hence a virtual long life span. Which means you can fly all day as long as you keep on changing the LIPO battery.
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        Finally, the brushless motor looks cooler as they are CNC machined made to precision.


        [youtube]http://www.youtube.com/watch?v=0CeYpyu_Z8c[/youtube]



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