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Old Mar 25, 2012, 02:29 PM
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I think I found a piece of your prop here in California.....
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Old Mar 25, 2012, 03:25 PM
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Moab, Utah, USA
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That's funny!
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Old Mar 25, 2012, 03:38 PM
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I made an error in my calculations. 16 volts would result in only 200+ amps, not 600.

Larry
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Old Mar 25, 2012, 03:51 PM
voodoo magic maaan
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so, what should I do... get a 1 cell battery?
I think I have been mis sold this motor...
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Old Mar 25, 2012, 04:15 PM
voodoo magic maaan
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ok, I have looked up the spec...
the rpm is 4550 per volt and 60,000 rpm max
so if running on 4 cells I have over revved it by a nats
If I run on 3 cell it would add up to approx 50,000 so will try that next
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Old Mar 25, 2012, 04:21 PM
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Even with one cell you are still looking at over 30,000 RPM which is way too high for most propeller driven airplanes. That might be appropriate for a ducted fan. What you really need is a motor with a substantially lower Kv or you could use one cell and a gearbox with a ratio of 3:1 or 4:1. What specific Kv, battery cell count, or gear ratio depends upon the airplane and how you want to fly it.

Larry
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Old Mar 25, 2012, 04:41 PM
voodoo magic maaan
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it is going in a silly quick pylon speed 400 type plane so no gear box required
are we referring to the same types of batteries? I use 2200mah lipo 3 or 4 cell batteries
will try 3 cells tomorrow and report back (damage report)
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Old Mar 27, 2012, 10:55 AM
voodoo magic maaan
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have ordered a castle link so i can better program my esc
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Old Mar 27, 2012, 03:51 PM
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Quote:
Originally Posted by lukeydukey10 View Post
ok, I have looked up the spec...
the rpm is 4550 per volt and 60,000 rpm max
so if running on 4 cells I have over revved it by a nats
If I run on 3 cell it would add up to approx 50,000 so will try that next
The problem isn't over-revving the motor, the problem is the motor pulling too much current. All of the references I've seen show the 1105/1Y to be a 10,0000 Kv, 200 watt motor. I'm not familiar with the S3.2 designation you tacked on, but since you say the Kv is only 4550 I have to assume that is some type of gearbox.

So, working with a Kv of 4550 and a 4.7x4.7 prop it looks like a two cell battery will get you a bit more than 24,000 RPM, 35 amps for around 240 watts and a pitch speed of 90 mph. You will note that the current is substantially below the capacity of the ICE75 ESC and the power is a bit above the motor's 200 watt rating. However, with good cooling you can probably get away with that.

Another thing to note is that the motor current will increase approximately with the square of the battery voltage. So, even though with two cells the current is half of the ESC capacity, doubling the motor voltage by going to four cells will increase the current by a factor of four. That would be twice as much current that the ICE75 is rated for. It's no wonder it wouldn't run with your 4 cell battery. By using 3 cells as you're proposing, the motor current will increase to around 80amps and the motor power will increase to over 800 watts both of which will definitely fry the motor.

Lastely, what you need more than the Castle Link is a watt meter and a better understanding of how motors work.

Larry
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