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Other › Extern BEC for CC 35 ?!
01-28-2007 10:19 AM  10 years agoPost 1
IcemanCharlie

rrNovice

Jonstorp, Sweden

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I have a problems with my CC 35, it gets extremely hot with my setup. Align 430L motor, 3*HS-65 MG, 401+9650,146iP receiver.

Someone said that they had exactly the same problem with his setup so he installed a extern BEC and viola, NO problems anymore

So what externs BEC should/shall I have

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01-28-2007 11:18 AM  10 years agoPost 2
Andreas

rrVeteran

Sweden

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Hi.

I would go for the medusa 6V 2A Bec. That's what i'm using and it works perfect. Same servos and gyro as you're using.

Cheers,

Andreas

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01-31-2007 04:46 PM  10 years agoPost 3
Learjet

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Ladera Ranch, CA

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I used the Dim Eng Park 6v bec on my SA w/ 3hs56 401 and S3154 works great! Some of the older CC35 did get a little hot.

chaz

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01-31-2007 04:53 PM  10 years agoPost 4
Rob_T

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..

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Castle do say the BEC on the P35 is able to drive 4 "normal" micro servos when powered from 3S lipo, but I dont like how hot they get doing that, so I use an external BEC. (I have an SBEC).

Using a digital servo on the tail is going to increase the load on the BEC even more, making it an easy decision to add the external BEC!

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01-31-2007 05:51 PM  10 years agoPost 5
cessna151

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Missouri... Originally Indiana

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Here's the one you want:

http://www.medusaproducts.com/BECs/MR-BEC-45035.htm

DO NOT get anything less than 3Amps!!!

--Eagles may soar high, but weasels don't get sucked into jet engines!--

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01-31-2007 06:06 PM  10 years agoPost 6
playfair

rrKey Veteran

Rochester, NY

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DO NOT get anything less than 3Amps!!!
Why do you say this? I've been running 2A for over hundred flights with ZERO issues, and that's with all digital servos, and pushing them. I know others, including Kyle Stacy, who have the same BEC and it's perfect. Matter of fact, Medusa has a 1.5A version that would probably work fine.
Show me the data that a Trex can realistically draw over 2A !!!


The sky is our canvas

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01-31-2007 07:26 PM  10 years agoPost 7
KamikaziRcPilot

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Cincinnati, OH

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I would borrow a BEC first to see if it's the BEC section of the ESC that's getting hot or the mosfets that drive the motor.

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01-31-2007 11:06 PM  10 years agoPost 8
IcemanCharlie

rrNovice

Jonstorp, Sweden

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I have already ordered:

BEC 2 Amp 6 V http://www.medusaproducts.com/BECs/MR-BEC-35020.htm

Optoisolator http://www.medusaproducts.com/Opto/opto001.htm

Looking fwd to see if this fix my problem

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02-01-2007 12:31 AM  10 years agoPost 9
marc8090

rrElite Veteran

Long Island, N.Y.

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How many cells are you running? On 3 cells with the same setup as you I never had a problem with the built in BEC overheating. Once I went 4 cells I installed the 6V Medusa BEC and have had no issues with that.

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02-01-2007 12:35 AM  10 years agoPost 10
deafheliflyer

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Arizona

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hi

I use the PARKBEC 6V, never had an issue and its only 20 bucks!!!

Crash-Prone and overcoming it!!!

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02-01-2007 01:45 AM  10 years agoPost 11
BikeNBoatN

rrVeteran

Santa Ana, CA USA

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I also use the ParkBEC. Works great, and my CC-25 esc never gets hot anymore like it used to.

Brent
Slow and Smooth 2-D Scale Flyer
AMA #35431

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02-01-2007 02:05 AM  10 years agoPost 12
murp

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Nova Scotia, Canada

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I have measured the current draw with 4xHS65, 139DP, and GY401 in basic forward flight I was drawing 0.3A total just hovering and FF with a 0.9A peak from really working the collective and tail. I think a 1.5 or 2A BEC is more than enough. In fact I went back to using my CC35 built-in, it gets warm but not hot, nothing to worry about IMO.

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02-01-2007 08:38 AM  10 years agoPost 13
Rob_T

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..

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.3A is going to generate 2.1 watts of heat. .9A is going to generate 6.3 watts of heat. That's assuming a lipo sitting at 12V.

With the 0.0045 ohm resistance of the FETs on a cc35, you can pass 37 amps though the ESC before you generate 6.3 watts of heat from the FETs (OK for you experts, I know I've simplified the argument because I didn't consider switching effects).

The point being, the BEC generates quite a lot of heat compared to the operation of the ESC itself.

Also for comparison, this is what you can do with only 5W.

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02-02-2007 02:31 PM  10 years agoPost 14
cgar777

rrNovice

Daytona Beach, FL.

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Hi everyone, I am still fairly new to electrics so some help would be appreciated. Let see if I understand this, if I put an external BEC on my Trex SA with a CC 35 it will use the external BEC to help drive the servos and use less of the voltage from the battery and the built in BEC of ESC? Sorry if I am sounding stupid I am just trying to figure out this elctric stuff. Thanks

Frustration is the point where expectation does not exceed reality!!

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02-02-2007 02:43 PM  10 years agoPost 15
murp

rrApprentice

Nova Scotia, Canada

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An external BEC will provide current for your servos, Rx, and Gyro so that you CC35 BEC won't have to. Make sure to remove the 5V wire (red one in the middle) from your ESC connector so that it doesn't try to power the other electronics as well. (you can slide the pin attached to the red wire out of the ESC connector and tape is back out of the way).

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02-02-2007 03:22 PM  10 years agoPost 16
Jay Mowl

rrApprentice

Owosso Mi. USA

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That is whats nice about the Park bec. You don't have to remove any wires on the plug, just solder the leads on the battery input, plug and play. For 20$ you can't go wrong!

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02-02-2007 03:25 PM  10 years agoPost 17
dct

rrVeteran

San Angelo TX.

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It's my understanding that the CC 35 esc has two bec built into it.
When one get's to hot,,, the other one kicks in!
I wouldn't worry about needing a bec for it!!!

**Now doing Forward Flight And EASY 3d! And having a Ball !!**

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02-02-2007 03:45 PM  10 years agoPost 18
murp

rrApprentice

Nova Scotia, Canada

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I agree, I don't think you need one either. I have made inflight measurements and the current is well within the 3A limit of the CC35.

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02-02-2007 03:46 PM  10 years agoPost 19
murp

rrApprentice

Nova Scotia, Canada

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BTW - if electronics are hot so that they can boil spit off your finger - then they are running too hot. If it is warm but you can hold your finger there all day - then that is not too hot by electronics standards.

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02-02-2007 07:59 PM  10 years agoPost 20
Rob_T

rrElite Veteran

..

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It's my understanding that the CC 35 esc has two bec built into it.
When one get's to hot,,, the other one kicks in!
True there are 2 voltage regulator chips, but they are in parallel and both supply current continuously. I think you'll find the reason for using 2 is to increase the heat dissipation capabilties by increasing the surface area used to radiate heat. If either one cuts off you're in trouble because the other will now heat up faster.
I agree, I don't think you need one either. I have made inflight measurements and the current is well within the 3A limit of the CC35.
3A is the limit ignoring thermal effects. The CC35 is also rated for 6S lipo. If you think 3A is the actual limit and thermal effects dont matter, then go fly on 6S using the BEC and see where it gets you.

The current limit you're quoting is the maximum that the BEC can deliver for brief times. Do it too long it gets hot and turns off. Your choice.

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