It seems that a common question among hobbyists is how to choose a motor/battery/propeller combination. I've seen several tools out there like ecalc and WebOCalc that help with this selection process. How many of you use these? Are they trustworthy? What do/don't you like about them?
I really appreciate your input!
You need to be a member of diydrones to add comments!
Replies
tried once but figured it was better to understand why select one battery, motor, prop. For starters if you want to use a standard 3S LiPo battery commonly used in F450 class copters you have to know your load so if you know the current draw of the motors, escs and control board you can know how much time it can fly for example if your load is 25Amps and you have a battery with lets say 10000mAh you know that the battery is giving 10Amps per hour so if you devide 10/25 youd get .4hours which is 24 minutes of flight time. Now for the motor you just need to know your expected weight of the quad + payload so you can use the next equation (weight/2)/number of rotors so if you want it to weigh 5pounds (5/2)=2.5/4 so as you can see for a 4 rotor vehicle every rotor needs to be pulling half the crafts weight. now for the selection if you want it to be acrobatic with no payload you should get 1000kv-1400kv with small propellers, if you want it for a payload you should buy 700-900kv motors with relatively bigger props. choose props suited for your motors looking at your motors specifications.
David Rodríguez Owner of Multirotorguides.com