Comments

• 

  Ellison Chan October 27, 2011 at 2:15pm

  @jacob_fan

  These are not really problems, but just design issues.

  What motor you use will depend on how heavy your quad is. Typically the frames will be under 1kg without motors and electronics and usually no more than 1.5kg with motors and electronics.  You just divide that by 4 and get motors that can provide at least 1/4 of that much thrust.  What propellers you use will depend on the recommendation of the manufacturer of the motor.

   

  Typical motors in these applications will be 600kv-1200kv.  The lower the kv the higher the torque and the slower the rpm, requiring larger propellers and the more thrust they can provide.  Typically prop sizes for the lower kv motors will be in the 12-14 inch range, and for the higher kv your prop will be in the 8-10 inch range.

   

  Most typical quads will use 1000kv motors with 10x4.7 prop. (10 inch diameter with 4.7 pitch angle)  This will should like a 1.2kg fully loaded quad without a problem.  If your weight start pushing into the 1.5kg or higher you'll need a motor in the lower kv range with 12 inch props at least.

   

  This is from my experience.
• Jacob_fan October 27, 2011 at 1:42pm

  hi，I am fresh. Now, i was researching the copter with four fans. However , i was confused about the problems, like" how many size of the fans and speed of the motor for loading the copers? so, if anyone know how to solve the problems. could you help me for recommanding some material or send to my email: jacob_fan@foxmail.com. Thanks!
• 

  Martin Szymanski October 27, 2011 at 1:12pm

  The process of elimination to the root cause can also be a bad battery that goes low in voltage with a current drain yet shows a good float voltage when not used. I know that if the battery is drained it tips the copter if I try to use it again. Make sure the level routine is done properly with trims neutral.
• 

  Ellison Chan October 27, 2011 at 9:29am

  One thing I do before trying lift off is to throttle up on the ground just to the point where I can move the quad, but not enough to lift off.  Then nudge all my sticks to see if they move the quad in the direction that I want it to.  

   

  Chris is right.  The APM is oriented for +, so you MUST use + mode.
• 3D Robotics

  Chris Anderson October 27, 2011 at 9:12am

  His APM is oriented for + (facing an arm), too. So it should set for + mode. I'd guess that the motors are connected in the wrong order.
• 

  Allen Bishop October 27, 2011 at 8:37am

  After looking at your video the quad is attempting to "roll".

  I had this same issue and found that the quad was set for X rather than + .  Your quad has red tape on only one arm which implies a + configuration and it may be configured for X but may be trying to fly in the + mode.

  Try clearing your configuration and do a config from the very beginning.
• 3D Robotics

  Chris Anderson October 27, 2011 at 8:32am

  Also: run the "Motors" test in the CLI, which will tell you if you've hooked up your PDB right:

  http://code.google.com/p/arducopter/wiki/AC2_Props_2
• 

  Ellison Chan October 27, 2011 at 6:47am

  Check your radio pitch trimming.  Make sure everything's in the middle and calibrate the radio.  Either that or the motors are not turning in the right directions or the props are on wrong.  Put up a slower shot of the motors moving, and a still shot of the props, so we can see better.  (Oragne arm should be CW, and the other arm should be CCW)
• 

  Adli Shahnaz October 27, 2011 at 6:33am

  Ethan: ok. I will try that. Thanks.
• Ethan Ferrell October 27, 2011 at 6:29am

  Adli Shahanza:

  I had an issue very similar with my quad at first. Triple-check the correct wiring on the power distribution board. Make sure you have the orange and white signal wires going to the ESCs in the proper order (front, back, left and right). I'm fairly certain that's what the problem is.