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Old Sep 19, 2011, 01:37 PM
Firefox
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USA, KS
Joined Oct 2005
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Turnigy RotoMax 50cc Size Brushless Outrunner Motor

OK, just received an email from HK concerning their Turnigy RotoMax 50cc Size Brushless Outrunner Motor.

I'd be interested on hearing from those who use it or have thoughts on it.

http://www.hobbyking.com/hobbyking/s...ner_Motor.html

Spec.
Battery: 12 Cell / 44.4V
RPM: 172kv
Max current: 120A
Watts: 5300w
No load current: 44V/1.65A
Internal resistance: 0.021 ohm
Weight: 1080g
Diameter of shaft: 10mm
Suggested ESC: 180A 12S Compatible
Suggested Prop: 24x12 Majzlik / 26x12 APC
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Last edited by Firefox675; Dec 01, 2011 at 04:57 PM.
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Old Sep 19, 2011, 04:30 PM
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Joined Mar 2011
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How many pounds of thrust?

Mike B
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Old Sep 20, 2011, 01:19 AM
Mad Scientist=Yes I built it:)
ISR_Technology's Avatar
United States, FL, Leesburg
Joined Sep 2011
1 Posts
I think its intresting to say the least I knew they were coming through a Korean contact I didnt relize they were going to be that big I was under the impression they were going to be like 15cc power, But I have A whole Slew Of Ideas for them
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Old Sep 20, 2011, 05:34 AM
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Antony (France)
Joined Sep 2003
3,004 Posts
Hi
I am skeptical regarding the announced no load Io=1.65A @ 44V
If some one could test that value
---
Kv = 172 rpm/V is a better wording
Mejzlik with an "E" (chinese are not good in orthograph)

Louis
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Old Oct 22, 2011, 12:22 PM
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Joined Jul 2005
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Just ran mine up for the first time on a 22x10 xoar gas prop.

It's still in one piece!!!!!!!
Ran up nice and smooth on a hobby wing platinum 120 esc

Haven't taken any measurements or any of that stuff. Hopefully get everything mounted for a fly tomorrow. Seemed have quite a bit of pull even on used batteries. Need to sort then end points out on the throttle.

Need to change the connectors on my wattmeter before I can do any of that stuff.
I'm just using this prop as it was laying about, prob go for a 24x12 when I've checked it all out and measured everything

Cheers

Wayne
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Old Oct 25, 2011, 04:20 AM
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Quote:
Originally Posted by inairco jr View Post
Just ran mine up for the first time on a 22x10 xoar gas prop.

It's still in one piece!!!!!!!
Ran up nice and smooth on a hobby wing platinum 120 esc

Haven't taken any measurements or any of that stuff. Hopefully get everything mounted for a fly tomorrow. Seemed have quite a bit of pull even on used batteries. Need to sort then end points out on the throttle.

Need to change the connectors on my wattmeter before I can do any of that stuff.
I'm just using this prop as it was laying about, prob go for a 24x12 when I've checked it all out and measured everything

Cheers

Wayne
How is this motor performing?
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Old Nov 14, 2011, 08:20 PM
RC Nut!
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Madera, California, United States
Joined Oct 2001
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Anyone else try one of these or have any input? I was thinking of getting one.
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Old Nov 16, 2011, 12:34 PM
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Haven't had a chance to fly this since my last post. Hopefully the weather will play games as I have a weekend away from social engagements.

Will get some measurements with the wattmeter. Got a xoar 24x12 eprop to try as well.

Cheers

Wayne
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Old Dec 01, 2011, 04:46 PM
STATUS TUNING
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Australia, VIC, Melbourne
Joined Dec 2010
293 Posts
I finally got round to retro fitting my H9 extra 27% with the 50cc Rotomax, the extra has done some hard yards and is used as a test hack now.

i pulled the DLE55 out for another project and the whole conversion only took around 2hours. (pics below are just showing mock install for testing CG)

setup:

50cc Turnigy Rotomax 172kv and 1080grams (takes dle props and 10mm shaft is tapped for spinners) $182 RRP
CC 160HV Speedy
2 x 5000mah 6s
Mej 23 x 8 (only prop i had at the time) 26x10 on its way


Results on Eflite watt meter 4580watts @ 103 amps after 20sec

CG was perfect with the batteries swapped in place of the fuel tank, and the 2200mah nimh receiver battery under the cowl.

http://www.flyinggiants.com/forums/s...t=68763&page=2
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Old Feb 20, 2012, 08:18 PM
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Our club is building a 16' Giant Quaker as a winter project. We are considering going electric for the power system. In researching our options I found this thread to be quite interesting. Something I haven't seen addressed in the configuration summaries is the type of connectors that are being used with these higher amp loads. Is it best to go the Anderson PowerPole route, or are there other options that meet handle the higher amp loads?

Rick...
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Old Feb 21, 2012, 09:23 AM
Jack
USA, ME, Ellsworth
Joined May 2008
17,140 Posts
To see the widest range of choices in connectors you can go to Hobby King and do a search for bullet connector and see up to 6mm bullets. But I can't seem to post a link to that search result with both terms in it so you'll have to do it yourself.

That won't show the Anderson PowerPoles and I consider them to be a good choice too.

Hobby King is not notorious for accuracy or honesty in advertising so you have to take their words with a grain of salt and look for honest and objective opinions elsewhere.

And the bottom line on 3000W and even 5000W power systems is that we don't need to actually have wire that will handle all of the current in the volts x amps = watts equation because of the way the current actually occurs as it comes out of the ESC and into the motor.

So in the end I would try anything for wiring and connectors that looked like it could handle current and test it to see how hot it actually got. And my personal standard for too hot is usually that I have to be able to keep a finger on it when actually taken to the highest load that I will actually use. That would basically mean 130F/54C or less. And there are some places where I will not even allow that much heat (a battery pack for instance).

I am not a monster electric user or flyer, just a interested lurker. Good luck with it!

Jack
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Old Feb 21, 2012, 11:05 PM
Bypass Ratio = Infinity
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United States, NC, Jacksonville
Joined Apr 2006
1,653 Posts
FWIW I have used 4mm bullet connectors up to 4.4kW and they have not gotten hot enough to concern me. If you did a 5.5mm or 6mm bullet you will be more than fine. I have also put 4kW-5kW through Deans without problems as well.
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