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Aerial Photography and Video > Large electrics - BEC or REG?
 
 
daytonabeach
Elite Veteran
Location: Oslo, Norway

My Posts This: Topic  Forum		Pros and cons with different kinds of setup?

I fex have a powerjazz and a123 batteries with futaba 14mz rx, how to decide what to choose without to much hassle?

I got a friend with a JR rx which as a built in bec function/port, but switching from Futaba to Jr is out of the question

EDIT: let me ad some more...
Whats the best BEC you can get disregarding price and weight?

Never argue with an idiot, he'll drag you down to his level and beat you with experience...
11-07-2009 05:41 PM
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Seablade
Key Veteran
Location: floating around

My Posts This: Topic  Forum		just dragging it over here to stay in topic

going farther off topic, but Dual BEC info here:
http://rc.runryder.com/helicopter/t383412p1/
http://rc.runryder.com/helicopter/t...hlight=dual+bec


I'm using two of the older Western Robotics Hercules. One off the main rotor 37v lipo and one of the tail rotor 14.8v lipo. The output is 5.2 and 6v. I'm using the step-down for the tail servo on each of them so it brings my Rx volts down to 5.2v for dual redundancy to the Rx.
I think the latest version of them has the step-down built in now.
Using dual BEC's require that you use a diode to prevent the volts flowing from the stronger battery to the weaker and that's what the Western Robotics Step-downs use so to regulate the voltage down to 5.2vdc.

Heat is my main problem with them as they are out of the airflow from the rotor. So I've added heatsinks to them and ducted air over them using a 40mm fan and shrouded them so the air is directed to flow through the heatsinks.
They will thermal shutdown at 100-125C so I've temp sensors on each one to monitor them in-flight.

This saves me the weight of separate batteries for the Rx.

"Vini, Vidi, Velcro"
11-07-2009 05:48 PM
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signwiz
Senior Heliman
Location: Lexington, KY and Sevierville, TN

My Posts This: Topic  Forum		What about the reactorX

I know it is a great regulator but don't know if it relates to the question?


And the Arizona Regulators?

Maybe don't understand the guestion, fully!

Ap is GOOD, AV is Better ...Getting Paid to Fly is BEST !
11-07-2009 06:05 PM
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daytonabeach
Elite Veteran
Location: Oslo, Norway

My Posts This: Topic  Forum		And guys, feel free to post any link to suggested products

Never argue with an idiot, he'll drag you down to his level and beat you with experience...
11-07-2009 06:15 PM
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gtxkid
Senior Heliman
Location: Pueblo Colorado

My Posts This: Topic  Forum		Look at Madusa
Real good luck i have had with them.

Logo 10 3D--NEU 1910 1Y motor--Castle creations 45HV and 80 AMP--Gy401 w-9254--Futaba T12ZH --JR ser
11-07-2009 06:25 PM
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PhotoShip One
rrAdvertiser
Location: Arizona & Taiwan

My Posts This: Topic  Forum		I have used Castle BEC Pro BECs on my HALOs with great success. I run them at 5.6v. They are robust and voltage can be configured with the USB Castle Link.

I prefer to use these over a separate battery/regulator.



Design Team - PhotoShipOne
11-07-2009 06:30 PM
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fergus
Key Veteran
Location: Ireland

My Posts This: Topic  Forum		Chris you have two alternatives to the conventional direct battery supply to the rx (NiCd/NiMh).

Option 1 is a battery elimination circuit such as the Western Robotics Hercules BEC.

http://www.western-robotics.com/her...per-BEC_hp.html

The use of a second BEC for redundency is also an option here as is being done by Seablade.

Option 2 is a voltage regulator operating off 2s Lipo as mentioned above. Examples include Emcotec, Reactor X, Arizona etc...

With this option I would suggest a 2s 2p lipo so that if one cell fails you still have full voltage going to the regulator. We are using the Emcotec regulator on our VR360 and it is a nice unit. I have also used the arizona regulator in the past and found it good (although it is quite bulky)

The other alternative is a built in BEC in the ESC such as seen in the Jive80HV. That is my prefered option.

Regards

Fergus
11-07-2009 06:31 PM
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daytonabeach
Elite Veteran
Location: Oslo, Norway

My Posts This: Topic  Forum		So, do i basically just plug it in between the ESC and the main pack?
Two, is that if one fails?

Ferg, you know how my packs are wired, do i need to modify anything for either this or that?

Never argue with an idiot, he'll drag you down to his level and beat you with experience...
11-07-2009 07:01 PM
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daytonabeach
Elite Veteran
Location: Oslo, Norway

My Posts This: Topic  Forum		And another thing, the 9254s doesnt allow any higher voltage than 4.8 packs...

Never argue with an idiot, he'll drag you down to his level and beat you with experience...
11-07-2009 07:03 PM
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fergus
Key Veteran
Location: Ireland

My Posts This: Topic  Forum		You solder the +\- to the main ESC leads. Plug in your pack as normal and it will power the rx as well. You could run a western robotics stepdown on the tail servo to get 4.8v. It is like a small servo extension lead with a resistor which drops the voltage for the tail servo.

Another disadvantage I forgot to mention is you will see reduced flight time. Not much but the main pack is now powering tour rx as well.

Regards

Fergus
11-07-2009 07:35 PM
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daytonabeach
Elite Veteran
Location: Oslo, Norway

My Posts This: Topic  Forum		Hmmm, are we looking at 1 minute of 8 min flight times maybe?

In a couple of weeks im going to load it down to 13kg auw, maybe i should get a pair of extra nimh instead

Never argue with an idiot, he'll drag you down to his level and beat you with experience...
11-07-2009 08:22 PM
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fergus
Key Veteran
Location: Ireland

My Posts This: Topic  Forum		If you had a Jive I'd recommend the internal BEC. To be honest in your shoes I wouldn't be adding an external BEC. Perhaps a voltage regulator and lipo would be a better option. (Ros would have a field day with that tho haha). NiMh is the easiest option and was the norm for a long time - nothing wrong with that once you properly maintain the packs.

Edit: less than 1minute I'd say with a BEC.

Regards

Fergus
11-07-2009 08:35 PM
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nooobs
Elite Veteran
Location: Toronto, Canada

My Posts This: Topic  Forum		Maybe you should get rid of your ABC packs... LOL

I run my RX from my main packs. No biggie on flight time.
11-07-2009 08:35 PM
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SKY-FLIX
Heliman
Location: Blythewood, SC

My Posts This: Topic  Forum		I am particularly fond of the Arizona regulator. What is especially nice is that it has two outputs. One at 4.8v and one that is adjustable. I'm not personally using it this way, but it has rudder and gyro inputs which pass through to the respective devices so as not to overdrive the voltage sensitive devices.

But personally I'm using the two ouputs to drive the two separate radio systems for flight and camera control. It never gets warm.
11-07-2009 08:49 PM
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daytonabeach
Elite Veteran
Location: Oslo, Norway

My Posts This: Topic  Forum		Hmm, why do i get the dont fix it if it aint broken feeling now

Ros, shut up if you know whats best for you, LOL

Never argue with an idiot, he'll drag you down to his level and beat you with experience...
11-07-2009 09:36 PM
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Seablade
Key Veteran
Location: floating around

My Posts This: Topic  Forum
Quote 
And another thing, the 9254s doesn't allow any higher voltage than 4.8 packs...

Yes it is originally rated for a 4.8v nicad pack that I remember charges up to between 5.4 to 5.8 on a full charge so it usually comes down to 5.2 or 5.3.
It' still rated for 4.8v, but it will run on 5.3 without frying it. the important thing is to have your gain set correctly so you do not over-work the servo and get it hot. We're not doing 3D with it!

"Vini, Vidi, Velcro"
11-07-2009 09:51 PM
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daytonabeach
Elite Veteran
Location: Oslo, Norway

My Posts This: Topic  Forum		[/quote]We're not doing 3D with it![quote]

No, were definitely not

Never argue with an idiot, he'll drag you down to his level and beat you with experience...
11-07-2009 10:11 PM
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daytonabeach
Elite Veteran
Location: Oslo, Norway

My Posts This: Topic  Forum		Anybody have any objections using these packs as rx batteries?
http://www.modellers.com/Avdelinger...t-HCAM6333.aspx

Never argue with an idiot, he'll drag you down to his level and beat you with experience...
11-07-2009 10:18 PM
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nooobs
Elite Veteran
Location: Toronto, Canada

My Posts This: Topic  Forum		Will they fit in your hearing aid?
11-07-2009 10:48 PM
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borneobear
Veteran
Location: Kuala Lumpur, Malaysia.

My Posts This: Topic  Forum		The Western Robotics HV BEC produces a huge amount of radio noise. I put my 35 mhz frequency checker next to it and the peaks were EVERYWHERE! - thats why its only recommended to be used on 2.4 Ghz radios only. But why use something that is so damn RF noisy????

Of all the BECs I have, the Align 6A BECs working on 2S1P had the lowest RF noise (almost zero noise). No guessing what I'm with flying with now.

Just my 2 cents,
BB
11-07-2009 10:48 PM
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Aerial Photography and Video > Large electrics - BEC or REG?
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