Aug 13, 2012, 09:01 PM Registered User Joined Aug 2012 2 Posts Question Wanna learn about moto specs More than just telling me which motors you'd recommend in a given craft, can someone point me to an article or discussion that explains how to determine what will work well? I really want to understand the specs for motors and what kind of lift I can expect from a set of motors/ESCs/props. I'd like to build a 60-70cm- hexcopter initially using a kk2.0 for control and a turnigy x9 rx/tx. Eventually, I plan to switch over to an arducopter board. I want a good solid platform with plenty of lift so I can heft a FVP system and as a platform for some serious tinkering. (I'd like to play with sonic obstacle detection.) A friend is planning a similar system, but wants to go a bit bigger and octo to start. Although both of us have experience flying both fixed wing and rotor rc, neither of us know how to determine what motors, esc's and props to use on a given project.
 Aug 14, 2012, 08:10 AM Registered User Joined Apr 2010 1,428 Posts This may also help you: http://www.rcgroups.com/forums/showp...10&postcount=3 > Motor and ESC > Tip 10
Aug 14, 2012, 08:35 AM
Registered User
Joined Apr 2010
1,428 Posts
Quote:
 Originally Posted by drhender More than just telling me which motors you'd recommend in a given craft, can someone point me to an article or discussion that explains how to determine what will work well? I really want to understand the specs for motors and what kind of lift I can expect from a set of motors/ESCs/props. I'd like to build a 60-70cm- hexcopter
At the start of the thinking there is the weight.
Motors and props depends on it.

What is the common all-up weight of a 60-70cm hexa with FPV gear, I don't know, maybe 2000g.
Owners of such set-ups could give more precise values.

At hover, motor-prop combo efficiency is usually between 7 and 8 g/W.
For 2000g you need 2000/7.5 = 267W
You will have 6 motors = 45W per motor.

Motors max power depends of your flying style.
If soft, it should be 2.5 times hover power = 110W (each motor max power)
If more dynamic, 3 times = 135W
If acro, 4 times = 180W

Secondly, you will have to choose the right prop for your motor.
It has to give you access to the full power of your motor, no less no more, and a good efficiency at hover.