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Old Nov 06, 2012, 09:14 AM
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turnigy ntm 50/50 motor

has anyone had any experience with these?

whats the performance like?

looking to put one on my angel 50 running 5s
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Old Nov 06, 2012, 12:02 PM
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Doug Bartley's Avatar
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We will need some more info to help. The motors total spec, including KV! Prop size, battery size and voltage/c ratings. Plane weight estimate. Remember the 3 amps/gram of motor weight when estimating the actual watts the motor can handle safely,esp with the HK's optimistic ratings. Doug B
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Old Nov 06, 2012, 12:31 PM
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Dr Kiwi's Avatar
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http://www.hobbyking.com/hobbyking/s...0KV_2000W.html

As Doug suggests...... HK is VERY optimistic if they expect a 347g motor to survive well at 2000W!

If we believe their prop data, 14x8 on 5s might be manageable. 60A/1100W would seem rather more sustainable than 90A/2000W.
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Old Nov 06, 2012, 03:22 PM
Rangers Lead the Way
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I have the 50-60 270Kv, but have not put it on a plane yest. Seems well made and magnets well glued unlike the other Turnigy motors. I don't know if this means anything, but the windings wire is definitely thicker than that used in the Turnigys I already have (all Gold motors), so maybe it can handle more amps, but I agree that 90A seems awfully high. While not necessarily reliable, user reviews of this motor on HK site seem good so far, which is not always the case for their other motors.

I would take that 90A with a big grain of salt. I bought this for a 1/7 Sea Fury on which I plan to run either a 16x16 APC pattern prop or a 5-blade custom (probably 16x14) from Zinger. Both will be 8S setup at this point. I'll definitely bench test before it goes in the plane and report back on how it seems to handle high amps.
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Old Nov 06, 2012, 09:51 PM
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Scorpion quote ~1900W for a 310g motor so it is not too unreasonable, provided turnigy are also using high-temp magnets. As we can presume this to be unlikely since the scorpion motor in question (http://www.scorpionsystem.com/catalo...s40/S-4020-12/) costs ~$140 the numbers would seem to be exaggerated considerably.
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Old Nov 07, 2012, 12:44 AM
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I'm a Scorpion fan but price is not everything. All these motors are made in China, but prices are significantly different: The Turnigy G46 ($45) is a copy of the Eflite Power 46 ($95) which is a copy of the AXI 4120/14 ($139). All three perform about the same and only the AXI has truly superior quality of components. Same goes for batteries - Thunder Power will happily charge you 3X what Turnigy will for what is basically the same battery.

Now, I happen to believe that Scorpion motors do truly use exceptional components and perform accordingly. But in other cases (especially Eflite / Horizon) you're just paying more for the name. Again, I'd take the amp claims on the NTM with a grain of salt, but Turnigy has no advantage in grossly overrating their motor either. All they will get for that is bad press. For the record, I have run my Turnigy Gold motors to their maximum spec numerous times and they are none the worse for wear. As long as you check the magnets for glue and threadlock everything, their stuff holds up.
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Old Nov 08, 2012, 08:49 AM
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thanks for the comments everyone.

im looking to run it on 5s, propping at about 15 x 8/10 so hopefully this should let put it around 60 - 70amp full beans.

its just arrived today, but here in the uk someone in hobbyking forgot to stock the accessory pack so i can mount the bastard!

ive got spare 50 size rear mounts, just not the prop adaptor to fit....
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Old Nov 09, 2012, 02:14 AM
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I picked up the 50/50 back in June for a project that I just seem to keep putting off....someday I'll get it airborne
My initial impression is that this motor is pretty strong although is comes to life running on 6s (22v) but thats just my 02'
I plan on disassembling it before putting it into service just to check the welfare on the magnets....some of the later reviews on HK's website has me spooked.
The fallowing video is my testing, no 5 cells in my arsenal so forgive that.

.......as posted on video info.......
Power Testing the NTM 50-50 580KV Motor as recieved from HobbyKing.
Turnigy 4000mah 6 cell lipo (40c)
APC 15x7
Castle Phoenix Ice Lite 75
1443 watts @ 65.5 amps. (22v)

other tests not video'd
APC 14x7 - 1198w @ 53 amps (same voltage)
APC 13x10 - 1436w @ 61amps (same voltage)
NTM Prop Drive 50-50 580KV Test (1 min 20 sec)
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Old Nov 09, 2012, 03:18 PM
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It was seeing your vid on YouTube that made me go for it! On 5 cells I'm expecting around 1000 plus watts which will be plenty. The motor seems fine upon inspection, so fingers crossed
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Old Nov 09, 2012, 03:38 PM
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Yes! keep us posted, I for one would like to know how it does on 5cell....before investing in more batteries.
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Old Nov 10, 2012, 07:28 AM
Jack
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Quote:
Originally Posted by Dacono Air View Post
..<snip>...
The fallowing video is my testing, no 5 cells in my arsenal so forgive that. ..<snip>...
The info in your testing is interesting but, unfortunately, it appears that you are using the same method that HK uses for getting their specs. A peak reading from a 2 second or so run without any temperature monitoring looks good but it leaves some questions unanswered...

I'm not trying to be unappreciative or criticize you, it is just that the testing needs to be more like the motor will be used as far as throttle openings and durations. And the temp rise and max temps seen are a pretty key piece of info.

Jack
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Old Nov 16, 2012, 12:30 AM
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Quote:
Originally Posted by theheed View Post
its just arrived today, but here in the uk someone in hobbyking forgot to stock the accessory pack so i can mount the bastard!

ive got spare 50 size rear mounts, just not the prop adaptor to fit....
Not an oversight. For reasons known only to HK, they've decided that the accessory pack on the NTM motors is not included. You have to purchase seperately, and the site is silent on this. Pretty dumb, but that's how it is. The only reason I figured it out was people bitching in the reviews.
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Old Nov 16, 2012, 12:30 PM
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Information provided by HK, if true, can be deduced:

With 6s, 15 x 8 - 22.2V / 1961W / 88.8A / 6.15 kg (assuming that it is an APCe)

8,650 rpm, 60.8% efficiency, 777 watts of heat.

Impossible to use the engine in these conditions.

But with:
15 x 8 - 18.5V / 1165W / 64.2A / 4.85 kg thrust,

7800rpm, 73.4% efficiency, 316 watts of heat.
Within the limits. previous measuring amperage.

Manuel V.
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Old Nov 16, 2012, 05:20 PM
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Quote:
Originally Posted by manuel v View Post
But with:
15 x 8 - 18.5V / 1165W / 64.2A / 4.85 kg thrust,

7800rpm, 73.4% efficiency, 316 watts of heat.
Within the limits. previous measuring amperage.

Manuel V.
Great minds think alike, Manuel: This is in the ballpark I suggested earlier

If we believe their prop data, 14x8 on 5s might be manageable. 60A/1100W would seem rather more sustainable than 90A/2000W.
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Old Nov 17, 2012, 11:30 AM
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Thanks Dr Kiwi, Manualv for confirming my suspisions on the 5050/580.
A couple of weeks ago a fellow flyer brought plans to show me. It an 84" Eurocoupe, espected weight around 13-14lbs.
He then mentioned he intended to order this 5050/580 motor. I baulked right away. When I looked up the specs it was obvious that once again HK is dreaming!
He wanted to stay with the same line of motors, after looking, I selected the 5060/380 as a more suitable choice with a 15/16 prop to try for 1400watts on 6S.
I guess your wisdoms are starting to rub off, hehe. Doug B
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