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ESC? Motor? Battery???????????

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Old 11-17-2005, 06:20 AM
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bubbleboy
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Default ESC? Motor? Battery???????????

Hi...been flying glow for a few years now. Bought my first electric kit and it recommends an AXI 2212/20 Brushless motor with Pheonix 25amp ESC and 3s2p Lipos. I understand the basics of current consumption but not all of this! What does 3s2p Lipos mean? How do I know what amp ESC to use for a motor? Will it burn out if not sufficent? Are you better to go higher in amps to be safe? With a multimeter how do I connect it up to measure the current draw. Sorry for all the questions but I want to understand all this so I dont blow up/ burn things out!!
Is there an article some where that covers all this?

Thankyou in advance for being patient with a beginner........[8D]
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Old 11-19-2005, 05:25 PM
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CoarseAir
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Default RE: ESC? Motor? Battery???????????

I'm a newbie myself, and have been reading here for days. I found some links here that helped me alot, and saved em for future reference. See if these help:
http://www.*********.org/lithium_bat...eakthrough.htm
http://www.modelaircraft.org/mag/FTGU/Part8/index.html
http://www.modelaircraft.org/safetycom.asp

Good Luck
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Old 11-19-2005, 06:51 PM
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Flypaper 2
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Default RE: ESC? Motor? Battery???????????

Usually a motor will give a recommended amp draw, say 15 amps. Any more than that and the motor could be hurting, such as overheating. Pick a prop that will get to that many amps without going over. Pick an ESC that will be at a higher amp rating than what the motor is. As you see, if the ESC were rated at 10 amps, it would overheat if asked to put amps through what the motor is asking for. 3s2p means 3 cells in (S)eries and two batteries in (p)arallel. The three cells would be 11.1 volts. The 2 in parallel would give you twice the amp draw of a single batt. or twice the flight duration. If this isn't clear holler at me. A good tool to get is a wattmeter in order to tell you how many amps the motor is drawing.
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Old 11-19-2005, 08:15 PM
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Default RE: ESC? Motor? Battery???????????

Thanks Flypaper 2 that explains it well. I now understand what the relation is between them. I had no idea the prop could control the amp draw like you said. With this "wattmeter" is this function usually on a multi meter or is it a specialist tool. Does it get wired in series or parrallel to read the draw and wired at what position in the circuit? Thanks for your patience. Thankyou also to coasre air I will go through that information......much happier now!!!!!
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Old 11-19-2005, 09:47 PM
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Default RE: ESC? Motor? Battery???????????

Watt meter plugs in between the batt. and ESC. Digital readout reads amps, watts, batt. voltage and time, I think. More of a specialist tool. Just change the prop and watch all the parameters change. Go to the Astro flite website to check it out.
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