RCCrawler Forums

-WHEELMAN- · 02-04-2009, 01:21 AM

When should I be using a BEC? Thanks in advance for the info guys.

Rockcrawler · 02-04-2009, 01:38 AM

It depends on you servos. I run nothing but hi torque servos so I run a BEC on mine. You will know if it starts glitching.

the3kid · 02-04-2009, 05:38 AM

Yea...its just a good investment...get a good one like CC and you'll never have to upgrade

Trugg · 02-04-2009, 05:54 AM

I would recomend running a BEC on just about every crawler esc out there. I have 4 Tekin FXR's and run CC bec's with all of them....couldn't be happier

Bent axial · 02-04-2009, 05:58 AM

I'm running a fxr with out a bec
1 steering servo rated for around 200 oz
It works fine

Holmes told me if i run a larger servo or a 2nd one ( like for dig ) i would need one, so I did last week when i ordered my dig.

binaryterror · 02-04-2009, 07:28 AM

Voltage also matters.

Mine ran great with a 8711 and no BEC on a 2S lipo. I moved to 3S lipo and things went bad!

When you increase the input voltage, you decrease the amperage on output for an internal BEC like the FXr.

Also if you run a dig, you might also have issues. For the $20 buy a BEC.

Scottish · 02-04-2009, 09:26 AM

yes i recommend the BEC for the $22 it costs

jeffc · 02-04-2009, 10:19 AM

What exactly is a bec and what does it do?
JEFF

sickness · 02-04-2009, 11:08 AM

Regulates a constant flow to the reciever.

-WHEELMAN- · 02-04-2009, 01:59 PM

Quote:

Originally Posted by binaryterror

Voltage also matters.

Mine ran great with a 8711 and no BEC on a 2S lipo. I moved to 3S lipo and things went bad!

When you increase the input voltage, you decrease the amperage on output for an internal BEC like the FXr.

Also if you run a dig, you might also have issues. For the $20 buy a BEC.

Sounds great im running a dna dig and plan on getting a 3s lipo so I will for sure be getting a BEC. Thanks gents!

Willy · 02-04-2009, 07:05 PM

Is there a recommended brand, model ,o rating that folks are using? After reading this I think I may need a BEC. I'm in process of building my first crawler and did not plan on adding a BEC but I think I will need to use one. Any recommendatins? Willy

Trugg · 02-04-2009, 08:34 PM

Quote:

Originally Posted by jeffc

What exactly is a bec and what does it do?
JEFF

Quote:

Originally Posted by sickness

Regulates a constant flow to the reciever.

Well kind of... but I use my CC BEC to power my steering servo directly....doesn't even go through the reciever (only the servo's signal wire goes to the reciever)
Imo, a BEC works much better and is much more trouble-free if you use it to directly power servos (sending the power around the reciever)

Trugg · 02-04-2009, 08:42 PM

Quote:

Originally Posted by Willy

Is there a recommended brand, model ,o rating that folks are using? After reading this I think I may need a BEC. I'm in process of building my first crawler and did not plan on adding a BEC but I think I will need to use one. Any recommendatins? Willy

Castle Creations
http://holmeshobbies.com/product.php...&cat=13&page=1

Tekin Prez · 02-04-2009, 10:03 PM

BEC stands for 'battery elimination circuit'. This is left over from the days when all rc cars had a receiver battery and when they were first put into the speedos.

On 2s a speedo BEC is pretty decent, but can still be amped out with heavy servos or jammed steering. On 3s a seperate BEC is pretty much required with all 1/10 scale speedos. The new breed of 1/8 BL speedos have switching BEC circuits instead of linear regulators and can be used with up to 6S.

We could add a switching BEC to the FXR, but it would more than double the size. Since the BEC is perhaps a more common failure point than the speedo it just makes more sense to have them seperate. They are cheap and easy to replace in a hurry or have a spare.

Tekin Prez

Rockcrawler · 02-04-2009, 10:47 PM

Quote:

Originally Posted by teamtekin

We could add a switching BEC to the FXR, but it would more than double the size. Since the BEC is perhaps a more common failure point than the speedo it just makes more sense to have them seperate. They are cheap and easy to replace in a hurry or have a spare.

Tekin Prez

I agree with that. I would much rather change a $20 BEC than a $100 speed control.

Willy · 02-05-2009, 09:11 PM

Quote:

Originally Posted by Trugg

Castle Creations
http://holmeshobbies.com/product.php...&cat=13&page=1

Trugg, thx for the reference. Castle Creations - I'll do a search and see what I find. Much appreciated. Willy

02-04-2009, 01:21 AM	#1
-WHEELMAN- Quarry Creeper Join Date: May 2008 Location: So-Cal Posts: 347	Just got an FXR do I need a BEC? When should I be using a BEC? Thanks in advance for the info guys.

02-04-2009, 10:03 PM	#14
Tekin Prez Pebble Pounder Join Date: Feb 2008 Location: USA Posts: 101	BEC stands for 'battery elimination circuit'. This is left over from the days when all rc cars had a receiver battery and when they were first put into the speedos. On 2s a speedo BEC is pretty decent, but can still be amped out with heavy servos or jammed steering. On 3s a seperate BEC is pretty much required with all 1/10 scale speedos. The new breed of 1/8 BL speedos have switching BEC circuits instead of linear regulators and can be used with up to 6S. We could add a switching BEC to the FXR, but it would more than double the size. Since the BEC is perhaps a more common failure point than the speedo it just makes more sense to have them seperate. They are cheap and easy to replace in a hurry or have a spare. Tekin Prez Last edited by Tekin Prez; 02-04-2009 at 10:38 PM.

02-04-2009, 01:38 AM	#2
Rockcrawler I wanna be Dave Join Date: Jan 2005 Location: Hueytown, Alabama Posts: 6,777	It depends on you servos. I run nothing but hi torque servos so I run a BEC on mine. You will know if it starts glitching.

02-04-2009, 05:38 AM	#3
the3kid Quarry Creeper Join Date: Dec 2008 Location: Suburbs Posts: 406	Yea...its just a good investment...get a good one like CC and you'll never have to upgrade

02-04-2009, 05:54 AM	#4
Trugg Rock Crawler Join Date: May 2008 Location: Mansfield, PA Posts: 560	I would recomend running a BEC on just about every crawler esc out there. I have 4 Tekin FXR's and run CC bec's with all of them....couldn't be happier

02-04-2009, 05:58 AM	#5
Bent axial Pebble Pounder Join Date: Nov 2008 Location: CO Springs Posts: 110	I'm running a fxr with out a bec 1 steering servo rated for around 200 oz It works fine Holmes told me if i run a larger servo or a 2nd one ( like for dig ) i would need one, so I did last week when i ordered my dig.

02-04-2009, 07:28 AM	#6
binaryterror I wanna be Dave Join Date: Jan 2004 Location: Detroit Posts: 3,583	Voltage also matters. Mine ran great with a 8711 and no BEC on a 2S lipo. I moved to 3S lipo and things went bad! When you increase the input voltage, you decrease the amperage on output for an internal BEC like the FXr. Also if you run a dig, you might also have issues. For the $20 buy a BEC.

02-04-2009, 09:26 AM	#7
Scottish Pebble Pounder Join Date: Jan 2008 Location: E. Concord Posts: 179	yes i recommend the BEC for the $22 it costs

02-04-2009, 10:19 AM	#8
jeffc Pebble Pounder Join Date: Dec 2008 Location: MIDDLE TN. Posts: 128	What exactly is a bec and what does it do? JEFF

02-04-2009, 11:08 AM	#9
sickness Pebble Pounder Join Date: Jan 2009 Location: Vermont Posts: 108	Regulates a constant flow to the reciever.

02-04-2009, 07:05 PM	#11
Willy Newbie Join Date: Aug 2008 Location: Roseville Posts: 23	Is there a recommended brand, model ,o rating that folks are using? After reading this I think I may need a BEC. I'm in process of building my first crawler and did not plan on adding a BEC but I think I will need to use one. Any recommendatins? Willy

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