Cobra Motor's Issue - Start and Stops at high throttle

[thorphar]

So I am just putting my new quad together and have encountered a minor problem.

My setup right now

• 4S 90C Nano-Tech Battery Lipo
• 30Amp Hobbyking ESC
• Cobra 2208 2000kv outrunner
• CC3d controller
• Orange RX

I have attached a link to the post below to show the problem in more detail.

However in words the motor starts up fine and then at higher throttle positions the motors stops and starts. Ive charged the battery before you ask.

https://youtu.be/UFWN2n2Y4_8

 

[holtneil]

Hi mate is it just one motor , I have seen this before but it was multistar motors so if its all 4 they may need ESCs with BLheli code , another thing it may be is its looks like the timing is out if the ESC are programable make sure it set up the same /timing/pwm etc

 

[thorphar]

its all the motors.

Could you explain how the timing is set on the esc's ?.

Thank you

 

[holtneil]

Hi you will need a program card , The esc you have is more for helis and planes so there are a few setting your need to look at, timing you can change ,2 settings pwm also you need to set them all the same
I was just reading the manual and default is 8 khz but for an out runner like yours it should be 16 khz so you do need a program card or do it through the transmitter look at the manual it will tell you how , your have to do each esc one at a time Also these ESCs can be flashed with simonk and BLheli code
http://www.hobbyking.com/hobbyking/store/uploads/811103388X7478X20.pdf

 

[thorphar]

I have this programming card for the hobbyking esc. Is the timing the setting you are referencing to ?

 

[holtneil]

Hi mate yes look at motor spec and it should tell you what to run timing at

 

[holtneil]

Cobra CM-2208/20 Motor Specifications
Stator Diameter 22.0 mm (0.866 in)
Stator Thickness 8.0 mm (0.315 in)
Number of Stator Slots 12
Number of Magnet Poles 14
Motor Wind 20 Turn Delta
Motor Kv Value 2000 RPM per Volt
No Load Current (Io) 0.77 Amps @ 10 Volts
Motor Resistance (Rm) per Phase 0.114 Ohms
Motor Resistance (Rm) Phase to Phase 0.076 Ohms
Maximum Continuous Current 20 Amps
Max Continuous Power (2-cell Li-Po) 150 Watts
Max Continuous Power (3-cell Li-Po) 220 Watts
Motor Weight 44.2 grams (1.56 oz.)
Outside Diameter 27.7 mm (1.091 in.)
Motor Shaft Diameter 3.00 mm (0.118 in.)
Prop Shaft Diameter 5.00 mm (0.197 in.)
Motor Body Length 24.0 mm (0.945 in.)
Overall Shaft Length 45.2 mm (1.780 in.)
Motor Timing 5-10 degrees
PWM Frequency 8 KHz


SO the jumper needs to be on the middle pins
Also dont run soft start this is for helis