|Jan 12, 2013, 08:44 PM|
Joined May 2011
I am currently in the process of designing my first quad! I have combed through the forums for the last couple of months as I currently fly planes and have become extremely interested in multirotors, not only for their ability to fly in smaller spaces but also because they are great for fpv!
I have decided to build an h-quad as a result of my forum searching. I understand the basics of planes and helicopters as well as a bit about quads. I've never set one up but am quite electronically and mechanically savvy. The one problem I'm having is picking a motor. My main concern for the motor is efficiency. I want to pick a motor that is extremely efficient, are there any motors that are known for efficiency? Does it matter 3s vs 4s? My goal is to have a quad that flies for 10+ minutes with fpv gear. I understand that it may not be attainable but I would like to get as close as possible. By the way my quad will probably be 500mm motor to motor. Probably similar to the one flitetest made...
Thanks in advance for the help.
|Jan 13, 2013, 05:14 AM|
Is a good tool for checking motors. It's not always 100% accurate but ill give you a good idea.
Tiger Motors are good quality and smooth and efficient but do cost a bit more. Axi even more so.
|Jan 13, 2013, 02:35 PM|
Joined Jan 2013
I pretty new at this myself but I'll share what I think I know:
The easiest way to really figure out what motor is the most efficient is to enter all the data here: http://www.ecalc.ch/xcoptercalc_e.htm
You need to know the specs of the motors.
Enter the weight of your frame and select 'Without Drive'
Enter how many cells your battery has (check the specs of the motor to see how many cells it can handle)
Enter how many batteries in parallel (probably 1 in your case)
Enter the total amount of mAh of your batteries combined.
Battery resistance is probably 0.0038 Ohm and 3.7V but you can try and look it up.
Enter how much each cell weighs (battery weight/number of cells)
Choose an ESC that is rated slightly above the peak load of your motors
Enter you motor specs
The rest is pretty simple, you will need to play around with prop sizes until you find one that doesn't overload the engine while still getting you off the ground well before 70% throttle (I think around 50% is ideal). Bigger prop means you will hover with less throttle but will also put more strain on the motors. You will see that you will start to draw too many Amps if you select a prop that is too large.
Play around with different batteries too, a battery with a lower cell count will cause the motor to turn slower so you will need a bigger prop. Some motors can use between 4-6 cells while others can just use one type.
It's really a great program if you do it right you can find the most efficient battery engine and prop combination.
Hope that helps.
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