300s KV motors - which are good these days? - RC Groups
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Nov 06, 2017, 12:04 PM
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300s KV motors - which are good these days?


I am going to build a 800 framme (looks like i am going for Tarot 810) and what motors in the 300 KV-range is good these days.
I have found theese - http://www.helipal.com/tarot-4114-hi...tor-320kv.html
- Are Tarot engines of good quality?

I have also been looking at Multistar 4114 motors. Anyone with experience?

/Daniel
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Nov 07, 2017, 05:23 AM
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They seems to have an efficiency sweet spot around 1.5kg, so 9kg for hexa AUW.

If your intended flight weight is far from this figure, look for smaller or bigger motors.
Nov 07, 2017, 07:10 AM
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ariaAQ's Avatar
Alternative: DYS BE5208 330kv, good quality, powerful, can use 18" props, long wires..

Just posted thrust test video:
https://www.rcgroups.com/forums/show...5-Carbon-FIber

Mini review (not finished yet) here:
https://www.rcgroups.com/forums/member.php?u=601401
Nov 07, 2017, 08:44 AM
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I can't read the values on Wattmeter in your video, can you tell us what is the wattage for 1.5kg mark ?

Bigger props is not a plus always, if the efficiency would be the same my preference is for smaller props, for greater disk loading => more stable in the wind.
Nov 07, 2017, 09:21 AM
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ariaAQ's Avatar
Sorry about the lighting, i'm to lazy to switch the light on..
Yup, that's why i bought 17" props. Just in case more thrust needed I can use 18" props.
Here's thrust data:
Nov 07, 2017, 10:25 AM
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ariaAQ's Avatar
More info:
- I use cheap carbon fiber props, i think should be more efficient with good quality props.
- I live in Bandung, 800m above sea level.

DYS only provide max thrust data with 16" and 18" props, here:
Nov 09, 2017, 04:55 AM
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I think 5xxx motors will be to big for my intension, I will probably not fly with bigger props than 1555. On the 810 frame.

I have seen DYS have some motors in the right size, but i am unsure of the quality and efficiency.
Nov 09, 2017, 07:37 AM
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ariaAQ's Avatar
So use 4xxx motors or 3xxx if your copter not too heavy.

I don't have expensive motor, but I have DYS, Emax, Sunnysky, Racerstar, ZTW and XXD motors.
I think DYS quality on par with Sunnysky and ZTW, smooth bearings,
Emax and Racerstar build quality also not bad, slight bearing noise,
XXD noisy bearings.

No motor failure in the middle of the flight so far, I'm not so worried about the motor, even 2 years old cheap XXD motors still running ok.

My accidents:
- ESC failure (1X)
- Ran out battery (no timer, no batt alarm, no telemetry, so = my fault)
- Heavy wind,
- and the rest of my crashes caused by me..

About efficiency, you can use manufacturers data as a build guidance. don't trust too much, need to test by yourself, or try to find reviewers data.
Nov 09, 2017, 03:49 PM
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Tarot 41xx seems the efficiency champion so far, for low cost motors.
And mfr data was been confirmed by user flights data.
Nov 09, 2017, 07:40 PM
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ariaAQ's Avatar
Tarot martin 4006 and 4008,
http://www.tarot-rc.com/index.php?ma...oducts_id=1543
http://www.tarot-rc.com/index.php?ma...oducts_id=1544

Amazing specs and efficiency, but don't trust to much,
4008 mfr data suggested 15-18" props, but i don't believe 85g motor can drive 17-18" props properly,
Should be good for you with 15-16" props, efficient motors, but no where near mfr data, here:
https://www.rcgroups.com/forums/show...ushless-motors
Last edited by ariaAQ; Nov 09, 2017 at 08:42 PM.


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