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Old 02-04-2012, 09:59 PM
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Mr. Cessna
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Question
ESC Controllers

I am new to electrics, in fact the only electric I have is a Trex 450, so I have a few questions. I know what plane I am going to get, a MT7-420 Maule, the motor will be a AXI5345/18HD, my question is, what amp capacity controller should I get? All the ads I've seen say a Jeti 99 controller, can I use a bigger amp one? Like a CC 120? I will be running 12s for batteries. Thanks in advance.
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Old 02-04-2012, 10:16 PM
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Don't know what your amp draw will be,but you can't get one thats too high,but you can sure get one thats too low.If you are going to get big into electrics an amp meter would serve you well,if you are going to just have one or 2 like me,find a friend with one.
Jeff Sikes
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Old 02-04-2012, 11:01 PM
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This is the plane I will be getting for the AXI motor.
Maule MT7-420 - Gernot Bruckmann - GB-Models (4 min 12 sec)
#!
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Old 02-04-2012, 11:21 PM
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Here is a calculator that you can use to get the right parts for your plane:

http://www.ecalc.ch/motorcalc_e.htm?castle
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Old 02-05-2012, 12:53 AM
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Thanks for the link. According to that calculator. I should go with a Rimfire 65cc and a 24x10 prop amd either 10 or 12s for the battery.
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Old 03-09-2012, 10:40 PM
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Use a castle 160hv with that motor, on a 26/12 Xoar on the ground draws 136 amps on 12s 6500's
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Old 03-10-2012, 06:30 AM
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Quote:
Originally Posted by hdpilot View Post
Use a castle 160hv with that motor, on a 26/12 Xoar on the ground draws 136 amps on 12s 6500's
Since the AXI web site says the 5345 /18 HD motor can only handle 75A for 30S that sounds like a problem. You can use as big of an ESC as you want but if you are drawing 75A or more continuously you can kiss that motor goodbye in about 30 seconds..

If you want your motor to survive long term you should be keeping it more in the 60A range. The recommended JETI 99 ESC sounds like a pretty ideal choice for that motor. Based on my experiences (CC ESCs catching fire) I would choose the JETI over a CC every time. Spending more money on a larger ESC than you need is really just wasting money and probably just adding useless weight to your airplane. Also, even if you need a larger ESC in the future, the current model may well be obsolete by then. Just get something that is suitable for the task at hand.

Oops, just went back a read the thread again.. My comments are based on the AXI5345 / 18 HD. If we're talking a different motor now, well, "never mind"... As far as the part about using a JETI vs a CC and selecting on that is adequate for the job (not way bigger than needed), I think that is still good advice..
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