0
\$\begingroup\$

I built a quadcopter. It had a very low total thrust/weight ratio, and after I added some components it doesn't fly any more, so I want to change its motors and propellers in order to increase thrust.

The total weight is around 90g; of this, 26g are the motors (20mm brushed motors).

Is it possible to generate [64 + motor weight]g of thrust with 4 brushed motors, each with a small propeller? If it's possible, what kind of brushed motors and propellers should I use?

Here are my actual motors/propellers; I don't have technical data about them because I don't remember where they come from (I have the since a very long time). Looking around on Google I found those images; in the motor image's site I found some information, but not very precise...

enter image description here

\$\endgroup\$
9
  • \$\begingroup\$ "I want to make my car faster. I dont know what kind of car it is, but it has 4 wheels and makes a vroom noise. What should I put on it?" You need datasheets, man. Sorry China is bad about providing them, but you won't get any real answers without them. I'm guessing somebody will vote to close because of that. \$\endgroup\$
    – Bryan B
    Commented Dec 14, 2016 at 15:49
  • \$\begingroup\$ @insta "I want to make my car faster. The only thing I know about my car is that it has 4 wheels..., because the car seller didn't gave me any technical data booklet and I don't have any experience in car building. But I'm interested in cars, so I want to learn enough to make it go faster rather than buying a faster one on giving it to someone else to do the job for me. So I go to my friend, who is a car mechanic, and I ask some questions, sure that he will give me useful information. If he can't understand what kind of wheels I have, and if they can go faster, he'll give me some other wheels" \$\endgroup\$
    – noearchimede
    Commented Dec 14, 2016 at 16:06
  • \$\begingroup\$ @insta maybe my question is to be closed, but not because I don't know data which isn't really needed to answer, neither because I don't know the answer to my own question. "Is it possible to generate [64 + motor weight]g of thrust with 4 brushed motors, each with a small propeller? If it's possible, what kind of brushed motors and propellers should I use?" is maybe too vague, but has nothing to do with Chinese datasheets. \$\endgroup\$
    – noearchimede
    Commented Dec 14, 2016 at 16:11
  • 1
    \$\begingroup\$ Apparently the major manufacturers have thrust tables: dronetrest.com/t/… and you can calculate the optimum propellor speed: quadcopterproject.wordpress.com/propeller-and-motor-selection \$\endgroup\$
    – pjc50
    Commented Dec 14, 2016 at 16:40
  • \$\begingroup\$ Quadcopters fly, so it must be possible. The data is out there. \$\endgroup\$
    – Neil_UK
    Commented Dec 14, 2016 at 16:43

1 Answer 1

Reset to default
1
\$\begingroup\$

I recommend looking for spare motors for existing quadrotors and back-calculating from here. Here is one example:

So these motors do not work. Search for the next motor and repeat the exercise. Keep the notes in spreadsheet or a text file. If you checked 30 motors and none of them worked it is time to give up.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.