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RE: [Paparazzi-devel] BL Question

From: Roman Krashanitsa
Subject: RE: [Paparazzi-devel] BL Question
Date: Wed, 12 Sep 2007 14:34:28 -0700

From what I know, there should be a range of operating current listed in the motor spec. There is a "long-term" current range for normal operation, and a burst range. See if your measured current fits within the limits.
Also, are you positive you want to use exactly this prop? Changing prop will also change your motor current drain.
You can also limit throttle range through ESC or through airframe config file. Umm if I am not mistaken, phoenix35 can output max of 35A current. Do you need that much? May be you can settle with phoenix25.. or 20
And of course, overheating motor is not good :)

From: address@hidden [mailto:address@hidden On Behalf Of Matthew Currie
Sent: Wednesday, September 12, 2007 10:45 AM
To: Paparazzi Devel
Subject: [Paparazzi-devel] BL Question


  I purchased an AXI 2212/26 brushless outrunner motor, 3S1P 2100mAh 18C LiPo, Castle Creations Phoenix 35 ESC, APC 9x6 SF props, and a Wattmeter.  From what I have read everywhere, including group-member reports this should have put me @ around 12A the max current for the motor.  Instead, with the wattmeter attached I watch the current climb steadily up to 12A from 0-90% throttle then the last 10% of throttle I see the current skyrocket from 12-19A.  The motor (obviously) gets quite hot at this point even for brief 5 second runs.  Anyone know what is going on?  A flying buddy said "dont worry about it thats static current and will get better in the air" but I want to be 110% sure before I smoke a motor.  If it "gets better in the air", my argument would then be what is the point of a wattmeter? =)

Matthew Currie

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