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Electric Warbird: Help with ESC Selection

Old 08-06-2014, 01:21 PM
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mark IX
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Default Electric Warbird: Help with ESC Selection

Ok, I need some recommendations for what is a good brand for an ESC. The application is a 1/5 Spitfire weighing in at around 18-20 lbs, 83" ws, and I will be swinging a 24-12 4 blade prop. As near as I can tell, the prop data indicates it requires about 2HP to swing this prop at 6000rpm. The motor I have in mind is a Turnigy CA80-80 with 12S 5000mah, 40C, Li Po batteries (2 6s in series). I would like to be able to program the ESC to set the LVC, soft start, etc. I don't have to have a BEC although it would be convenient. Any suggestions would be helpful regarding selection criteria, brand, current rating, etc.

Thanx, Mark
Old 09-12-2014, 11:03 AM
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mark IX
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I can't believe no one has responded to my question.............
Old 09-12-2014, 01:30 PM
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So what did Hobby King tell you to use ?
HA ! , Sorry couldn't resist .
I don't use HK motors anymore so I don't know how bad and inefficient that motor will be but I have a 60cc sized electric motor and use a Castle Edge 160amp ESC . I would say a 160 or a 200 amp ESC will be fine. As far as the manufacture,if you are going cheap on the motor I guess you will be going cheap on the ESC too. You can get a cheap ESC from HK and together with the motor the total price will be about what a quality ESC would cost.
It's your plane and money so it's up to you.
Old 09-12-2014, 05:33 PM
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mark IX
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Brian, thanx for the insight. I have recently been looking at the Rimfire 50cc 80-75-230 Brushless Out runner motor. It's alittle bit more expensive but at least I can get it in the states. Any experience with their motors?

Mark
Old 09-13-2014, 03:20 AM
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I have used the Rimfire motors and they have been good. At least if something happens to it the company will be there to help you. The same goes for a good quality ESC. I have gone the cheap route for motors and esc's and in the long run it's not worth it ....in my opinion. Especially when you get into the large sized motors and ESC's.
For added security you can run a BEC (again the Castle BEC is one of the best) or simply run a LiFe battery pack strictly for the receiver. That way if something happens to the ESC you will still have control of the plane.
Old 11-03-2014, 11:52 AM
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mark IX
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Brian have had any experience with the Turnigy ESC's? In particular the DLux 160A ESC?

Mark
Old 11-03-2014, 02:37 PM
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Yes
I did several years ago and I won't use any of HK's electronics anymore. You do get what you pay for.
Old 11-07-2014, 09:34 PM
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18 pounds at 150W per pound = 2700W
2700/746=3.16 HP
W=IE, so an example using 100A -- 2700/100= 27V
Or 2700w/22.4v= ~121A (6 S Lipo)
'Nuf said!
A .90 equiv motor might get the job done, if the desired prop size, etc. can be used.

For various reasons, I'd use a separate BEC or two.
With electric retracts, Two BEC's make a lot of sense, and in other chases, with larger models and particularly with digital servos.

HV ESC's are pricey!
On the other hand, 100A and above makes me a bit nervous!
(The high current connectors and solder joints in particular! )

Last edited by chuckk2; 11-07-2014 at 09:42 PM.
Old 11-08-2014, 08:41 AM
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til
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I would stick with the 12S setup so as to keep the current draw down (6S 5000 x 2 sounds great, with a max current draw of 80A this is less than 20C) .
I have used the Turnigy SK3 aerodrive motors from Hobbyking and whilst not claiming that they are as good as the most expensive motors they are absolutely fine for your application. I would recommend the 6374 - 192kv rated at 80A which will give 3000+W of power at 80A.
I also use the Turnigy Dlux ESC's with no problems.
I use 2 receivers with 2 becs, each bec is taken of each of the 6S lipo's, power 1 aileron and 1 elevator from each of the becs, both flaps on one receiver, gear and doors on the other. This gives greater redundancy (will get you home with only one aileron and elevator it happened!) and less power draw thro' each receiver.
If you use 6S your current draw will be twice as much as a 12S setup. I also use the Turnigy Dlux ESC's with no problems.
Til

Last edited by til; 11-08-2014 at 08:51 AM.
Old 11-10-2014, 06:38 PM
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mark IX
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Actually using the Turnigy CA80-80-10 motor with the DLux 160A ESC, the e-Calc prop calculator (from Castle Creations) says that 10S, 8000, 25C batteries ( 2 5S in series) works the best for current draw, mtr temp and flight time. Using 24-16 4 BL prop, the max current is 150A, mtr temp is 127F, and a flight time of around 6 min. The pitch speed is 65-68 mph as well.

At 12S, 6000, and 25C, with the same motor and prop, the mtr temp is around 145F and the flight tome drops to around 4 min. So I think 10S is thway I'm gonf to go and aseparate Rx battery as well.

Mark

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