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Aug 17, 2020, 06:41 PM
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E-flite Park 450 890kv question


Has anyone had experience running this motor on 4s?
Don't wish to smoke mine, but could use the extra power.
If I keep the amps below motor maximum, should it be ok?
Thanks, Sam
Last edited by esl1885; Aug 17, 2020 at 06:51 PM.
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Aug 17, 2020, 08:18 PM
Electron Whisperer
speed2004's Avatar
Motor won't have issue with voltage - choose esc and prop that keeps the AMP BELOW maximum and it will be ok. Maybe start with 50amp esc and a 10x5 prop - then use wattmeter to determine if can upsize.
Aug 17, 2020, 08:24 PM
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Thanks, thought that would be the case, just needed confirmation.

Sam
Aug 18, 2020, 11:21 AM
homo ludens modellisticus
Ron van Sommeren's Avatar
Quote:
Originally Posted by esl1885
Has anyone had experience running this motor on 4s? ...
Motors can handle any voltage in RC land, their wire insulation (lacquer/resin) can handle several hundred volt.
As long as current and rpm don't get too high.

Current drawn is proportional to pitch, #blades, voltage≤, Kv≥ and diameter⁴.
So, as voltage goes up, propload must come down if you want to keep current within limits.
Highest indicated propload goes with lowest indicated voltage. (lots of manufacturers and shops mess those prop- and voltage-ranges).


Vriendelijke groeten, en wees voorzichtig, Ron
• Without a watt-meter you are in the dark ... until something starts to glow •
e-flight calculatorswatt-metersdiy motor tips&tricksCumulus MFC
Aug 19, 2020, 02:34 PM
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OK, so I put in a 4s battery with 9-6 slow fly prop. Ecalc says it should pull 15 amps and a little over 200 watts.
It pulls 23 amps and a little over 300 watts. Would the amps drop all that much when unloaded in the air?
At half stick it is still pulling almost 13 amps. Don't think the motor would last long.
I don't understand how ecalc is so far off.

Sam
Aug 19, 2020, 03:31 PM
homo ludens modellisticus
Ron van Sommeren's Avatar
No, unloading is not that much.

eCalc c.s. should get you within 5-10%.
Can you post your eCalc screens/inputs?
Have you measured current as well?

Vriendelijke groeten, en wees voorzichtig, Ron
• Without a watt-meter you are in the dark ... until something starts to glow •
e-flight calculatorswatt-metersdiy motor tips&tricksCumulus MFC
Aug 19, 2020, 03:52 PM
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I checked amps with watt meter and an amp probe. They both read 23 amps and the watt meter read a litle over 300 watts.
Aug 19, 2020, 04:05 PM
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With my throttle channel set up linear, it pulls 13 amps at half stick.
Aug 19, 2020, 05:12 PM
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Could the speed control play a part in this high current draw? I am using a pretty old CC phoenix 25 amp. It is at least 15 years old. It gets hot to the touch in just a few seconds.
Sam
Aug 19, 2020, 06:05 PM
Electron Whisperer
speed2004's Avatar
Are you using the BEC? CC25 is rated 4S with NO BEC! It's also a 3A linear I believe so would account for the heat.
Pull the red wire and use a separate battery or BEC for the receiver/servos or use an ESC that is rated 4S with a switching BEC. then see what results you get.
Aug 19, 2020, 07:04 PM
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No room for separate battery or BEC. Will pick up another speed control tomorrow and see what it does.
Thanks, Sam
Aug 20, 2020, 08:02 AM
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Fourdan's Avatar
ESL1885
IMHO eCalc (your picture) is considering an APC 9x6E to get around 15A (instead of SF, that is absorbing more power)
---
If you try Scorpion Calc (freeware on RC Groups thread)
* starting with HK3014-900 edited to 80 grams and Kv 890 rpm/V
* adjusting voltage at 14.2V
* adjusting ESC (ir)
you could get around 23A
see my picture
---
Note: Lucien's prop chart (Badass 2310-900) is giving 14.5 A for the APC 9x6 E under 4S
Louis
Latest blog entry: Scorpion Calc
Aug 20, 2020, 08:11 AM
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It does not matter which prop I plug in on ecalc, 9x6E vs 9x6SF, I get the same results.
What you are saying, is ecalc prop data is not working. Correct?
Last edited by esl1885; Aug 20, 2020 at 08:27 AM.
Aug 20, 2020, 08:21 AM
Registered User
Fourdan's Avatar
Quote:
Originally Posted by esl1885
It does not matter which prop I plug in on ecalc, 9x6E vs 9x6SF, I get the same results.
Hi
On the contrary Scorpion Calc is making a difference between power coefficients Kp
APC 9x6 E ; #113
APC 9x6 SF ; #139
So the powers absorbed (and currents) are largely different
Louis
Latest blog entry: Scorpion Calc
Aug 20, 2020, 09:03 AM
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Thread OP
OK, put a 9x6E prop on it and it pulls 18 amps. I can live with that, as I will seldom fly at full throttle.
I'm surprised that there is that much differenc between the two props.


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