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Old 03-28-2021, 09:18 AM
Leon Adams is offline
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Help needed to set up 2S pack for hi speed servos

Hi all,
I am new to the site and have been in RC for 25 years. I recently got back into the hobby and decided to go electric. My question is I purchased an EF slick with a power 22 engine,airboss 80A ESC and Hitech HS-7245 MH servos. I am told to get better speed and torque I should hook up a 2S pack to run servos. Unfortunately, I have no idea how this is done. Is there a simple solution to this? Any advice would be greatly appreciated.
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Old 03-28-2021, 09:25 AM
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You buy a 2S pack and plug it into your receiver, just have to make sure all your servos are HV rated, those are.
https://www.helidirect.com/pages/sea...se+2s+rx+packs
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Old 03-28-2021, 10:15 AM
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Also, I'd imagine that you want to set up the ESC per whatever directions are included to only control throttle, and to not supply power to the receiver. In other words, you need to disable the BEC (battery elimination circuit) function of the ESC.
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Old 03-28-2021, 06:36 PM
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Quote:
Originally Posted by Leon Adams View Post
... a 2S pack ...
LiFePO4, 3,6volt fully charged, or LiPo, 4,2volt?


Quote:
Originally Posted by RCAddiction View Post
... you need to disable the BEC (battery elimination circuit) function of the ESC.
Don't forget to remove the red pin from one of your ESC connectors. Otherwise you get two (slightly) different voltages, linear lbec and battery, or lbec and lbec, fighting each other. Or in the case of switching sbecs, two frequencies fighting each other.

No need to remove the red pin if you are using a fake opto controller (just bec-less) controller, or if you are using a true opto isolated (here a BEC would be useless) controller, usually high power controllers.
There's also no need to remove linear LBEC red wire if manufacturer says so, but you must remove it when using switching SBECs.

(UBEC is a propriatery brand name, a generic informationless acronym, I prefer LBEC, linear, and SBEC, switching, those two acronyms contain more info.)

But don´t cut the red wire, you may need it again in another plane.


Vriendelijke groeten en wees voorzichtig, Ron
Without a watt-meter you're in the dark ... until something starts to glow
E-flight calculatorswatt-metersdiy motor tips&tricksCumulus MFC







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Old 03-28-2021, 06:38 PM
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Quote:
Originally Posted by Leon Adams View Post
... decided to go electric. ...
Some well-structured reading for rainy/windy days, including e-flight_101 & 102, and some handy e-tools. Will save you, and us a lot of questions. Notably the 'what went wrong?' kind of questions Will also prevent you from burning up several controllers and/or motors and/or battery:
E-flight primer and tools

And pleasepleaseplease, do your RC equipment, wallet, ego, battery, controller, motor, house/garage/car a big favour ... get a watt-meter. It will more than pay for itself, will save you at least one fried motor and one fried controller. Will also help you finding the best setup.


Vriendelijke groeten en wees voorzichtig, Ron
Without a watt-meter you're in the dark ... until something starts to glow
E-flight calculatorswatt-metersdiy motor tips&tricksCumulus MFC
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Old 03-28-2021, 06:58 PM
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Buy a good quality bec and forget the second receiver battery. Gryphon or a castle creations, etc etc,,
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Old 03-29-2021, 01:05 PM
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That's a 60" plane. I have had alot of those. I would switch to a Castle talon 90 esc, set the BEC up higher on it and go fly. Anything 30cc and bigger I change my plan of attack
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Old 03-29-2021, 02:01 PM
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Quote:
Originally Posted by nappyroots2182 View Post
That's a 60" plane. I have had alot of those. I would switch to a Castle talon 90 esc, set the BEC up higher on it and go fly. Anything 30cc and bigger I change my plan of attack
Agreed, same way I run my 60" electrics
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Old 03-29-2021, 05:20 PM
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EF 64" MXS with Cobra motor and Talon 90 on 6S, sweeeet!
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Old 03-29-2021, 07:47 PM
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('UBEC' is a propriatery brand name, no information in the name. I prefer LBEC, linear, and switching SBEC, switching, gives more info.)


Don't use more than three servos in combination with linear LBEC on 3s.
And no more than two servos on 4s.

The higher the power-pack voltage, the fewer servos a non-switching = linear BEC can handle. Switching BEC's hardly have this restriction.
The higher the battery voltage, the hotter a linear BEC will get, for a given current/load/servos.
Or, in other words ...
The higher the battery voltage, the lower the current a linear BEC can supply.

In depth:
All about BECs for RC model planes (24 min 58 sec)
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Old 03-30-2021, 01:24 PM
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Good info Ron...... a bit confused...lol (confused, NOT confusing)
have some reading to do, and will have some questions...
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Old 03-31-2021, 07:01 AM
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Don't hesitate to ask for more clarification Patricio.

The higher the input voltage of an LBEC, the more power it has to burn off, creating more heat in the LBEC. To get excess heat down, current to servos has to come down, otherwise the LBEC will stop functioning.
The very bad news: once the LBEC has cooled down after the crash, it may function properly again (although it took a beating), making it difficult to find the cause of the crash.


Vriendelijke groeten en wees voorzichtig, Ron
• Without a watt-meter you're in the dark ... until something starts to glow •
E-flight calculatorswatt-metersdiy motor tips&tricksCumulus MFC
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