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Home✈️Aircraft🚁Helicoptere-Elec-Helicopters New or Limited ActivityBeam › PLEASE HELP! Expertise on 4s setup needed, badly.
08-22-2008 03:34 AM  12 years ago
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rc2000

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PLEASE HELP! Expertise on 4s setup needed, badly.
[B]I really want to put a 4s setup in my beam but am having a very hard time finding anyone that can help me with what equipment to get and what to look for. I understand I need an external bec but why and which one out of the 5 million? I know NEU, Kontronic, Medusa and Scorpion make good motors for 4s but which company is the best for the price and after narrowing that down, which motor? There are alot. Once I find a motor, how do I pick out an esc that will work best and does it matter what bec I get for the esc? Or whould it be better to get an esc with a built in switching bec. I would love to see what other people are using for their 4s setup but can't find anyone. I really don't have the money to be expiermenting so if anyone can help me I would GREATLY appreciate any advice on the subject. Thanks.
-Rob
Mars 480, Beam E4
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08-22-2008 03:50 AM  12 years ago
Heli 770

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rc2000
What kind of flying do you intend to do?
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08-22-2008 05:03 AM  12 years ago
Brovic777

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The Scorpion 12 I know works on a 4s setup.

http://www.readyheli.com/HK2221_12_...p/hk2221-12.htm

The Align 35amp ESC says it handles a 4s setup:

http://www.readyheli.com/Align_K103..._p/k10304ta.htm

The Medusa 6v BEC should work good also:

http://www.readyheli.com/Medusa_Pot...bec-35020-6.htm
Killer Beam E4 450
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08-22-2008 10:14 AM  12 years ago
rc2000

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Thanks brovic. I look into that. I just need to figure out what makes a motor and esc 4s compatible.Mars 480, Beam E4
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08-22-2008 12:11 PM  12 years ago
mr2rbo

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Virginia

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Just look at the input voltage specs on the specific components that you are looking at (make sure they are rated up to 14.4V). You don't really need an external BEC with certain ESC's. I don't use one on my Jazz40.
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08-22-2008 08:27 PM  12 years ago
Heli 770

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rc2000
Get a 55-amp Scorpion ESC. It has a 5amp Bec. You won't have to use an external one. The ESC will run a 2221-6 on 3S also a 2221-10 on 4S. Start with a 11T, pinion on the 2221-10, head speed will be around 3100rpm.

You can also use the 2221-8
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08-23-2008 03:11 AM  12 years ago
rc2000

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great advice guys. thanks. question though. the scorpion -10 motor is rated at a max of 42a continuous, so wouldn't all I need is a 45a esc or does the 55 have a better bec? I also read that an external bec is better because it keeps the esc cooler especially with a 4s battery. Is that true? Thanks.Mars 480, Beam E4
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08-23-2008 03:22 AM  12 years ago
Heli 770

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rc2000
The reason I say the 55amp ESC. The BEC 5amps and you can use it with the other motors. The 45amp ESC will work with the 2221-10 and the 2221-8 but it only has a 3amp BEC. that means you will need an external BEC. With the 55amp ESC it's the most versatile.
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08-23-2008 01:42 PM  12 years ago
rc2000

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Oh ok. Thanks for explaining. Question about bec's. I understand that if a bec states 2.0 Amp 5v HV BEC that means that it is putting 5v to your servos, anything more could fry em unless they are rated for 6v, right? But what does the 2a do or mean? Is that what it is sending to the motor or sending to the ESC?Mars 480, Beam E4
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08-23-2008 01:46 PM  12 years ago
Heli 770

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2amp is what's available from the batt. to your electronics.
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08-23-2008 01:51 PM  12 years ago
rc2000

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Ok. So what does that mean? Sorry for so many questions. I just want to understand how all this works and ties in together instead of just getting what someone tells me I want like I did the first time with my 3s setup.Mars 480, Beam E4
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08-23-2008 02:07 PM  12 years ago
Heli 770

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Your RX, gyro, Servos all needs voltage and amps the BEC must supply it. IF the BEC is rated to low (amps) things won't work.
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08-23-2008 02:15 PM  12 years ago
rc2000

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ok so, how do I find out how many amps everything needs. All I can find is the voltage operating ranges but no amp operating ranges. also, do the electronics pull power from the bec or does the bec push power to the electronics? The reason I ask is so I don't get a bec that puts too much power to the electronics and start burning things up. My friend has an external bec and he keeps frying servos and that is why I have avoided bec till now. That is alos why I am trying to find out as much as possible.Mars 480, Beam E4
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08-23-2008 02:28 PM  12 years ago
Heli 770

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Three reasons your buddy is frying servos, servos are binding, to much voltage, and not enough amps. The Bec pushes to the electronics (volts)
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08-23-2008 02:31 PM  12 years ago
rc2000

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So the trick is to get a bec that does not push more then 5v but how many amps should it push? This is what I have on my beam right now. I have a spectrum 6100e reciever(Voltage Range: 3.5V-9.6V), HS-65HB servos(4.8-6.0v) on the swash, GY401 gyro(no volts or amps requirements found) with Futaba S9650(4.8-6.0v) digital servo on the tail.Mars 480, Beam E4
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08-23-2008 02:59 PM  12 years ago
Heli 770

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rc2000
You can never have to many amps. What you are asking for no one can really tell you. You must test your system on the bench or in flight with a logger to know what your system consumes.
Maybe this will help you.
wattflyer.com, look under electric general.
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08-24-2008 03:11 PM  12 years ago
rc2000

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Thanks for that website. I found a forum thread that went into detail about the ubec. It explained everything I wanted to know about esc and bec and the function of what they do. Once again, thanks for that website. It is exactly what I have been looking for for learning how all this electroncs stuff works.Mars 480, Beam E4
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08-24-2008 03:15 PM  12 years ago
Heli 770

rrProfessor

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rc2000
Good to here it!
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