i wan t to know the relation between rpm and thrust. what is the formula or how can i calculate it.
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i wan t to know the relation between rpm and thrust. what is the formula or how can i calculate it.
You need to be a member of diydrones to add comments!
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Use "Drive calculator". http://www.drivecalc.de/
It's a free software with a database of most wellknown motors and propelers.
Choose your motor, propeler, enter your batterie voltage and you will get all you want to know about your setup.
Some parameters like motor winding resistance (Rd) are very important. Check that the value in the database is the same as the real value on your motor.
If you want precise results and go from thery to the real world, you'll need a test jig with a wattmeter, an RMP meter and thrust meter.
http://www.grc.nasa.gov/WWW/k-12/airplane/propth.html
Note that, as the craft speeds up in the opposite direction of the generated thrust, the generated thrust decreases, suggesting that the maximum ideal airspeed of the craft is the same as the speed of the induced air.
It's also a good explanation as to why its a bad idea to go into a headwind if you want to save fuel. :)
Edit: You can research into Blade Element theory, but I think that's a bit too much math for the moment. Besides, your ESC's and motors are not going to be running at a perfect 5000RPM all the time.