I am planning to build a Quadcopter for some time, I have all the required gear and an airframe completed. Before I start assembling the entire quad I would like to know what the lifting capability will be when complete.
I know that one motor with a 2 blade prop will lift 2Kg whithout any hassle at approximately 70% power (thrust test, not in airframe). Does this mean that for a quadcopter I can assume that four motors will lift 8Kg @ 2Kg per motor or is there some other calculation to accomplish this?
I'm interested in this calculation, for my own rig:
8Ahr 6S 35/50C = 176watts per hour
3508-29's at 100% with my prop is 310watts, according to t-motors charts.
1240 watts total = 0.14 hours or 8.8 minutes at max power
Pulling 57 amps? or "7.125 C (57/8)"? Have I got that right?
Edit: No I don't. Amps at 100% = 7.2A. 4 x 72.A = 28.8A. Battery can do 8 x 35 = 280A. "C" draw is therefore 9.7C
Err...rather *percentage* draw is 10.2% of max C. Just to be pedantic. I'll shut up now.
You should calculate lift at ~50% throttle. In other words the copter and payload should hover at 50% throttle. The reason for this is that the copter needs a lot of thrust headroom to maneuver properly. You also get very short flight times if you push the system to much.
The link you shared here, does not have any units. What should I be filling under Thrust/ RPM. Is this RPM/ volt or maximum RPM.
Should I be filling Altitude (in meters or feet), and how does this relate??
Can someone help me with this for amp draw http://diydrones.com/forum/topics/trouble-with-a-hex-voltage?xg_sou...