More questions about ubec's

[MicroMan]

Basically I need to know how to set up a 5.3 volt system vs a 6 volt system. I have 3 9650s on the swash and plan on using a s9254 on the tail. Ive been told applying more than 5.3 volts to the s9254 will shorten its life so I figured Id go with the 5.3 volt system and prolong the life of my s9254.

One option is to do a 6 volt system with a different servo that can handle 6 volts or 5.3 volts like the Hitec HS-6965S, My issue is that Ive already purchased the s9254. I could sell the 9254s and get a HS-6965S which would solve my problem outright on choosing between 6v or 5.3v electrical system.

Another option is to run a 6 volt system with a stepdown between the GY401 and the s9254 like the Trex 600 guys are doing. Im not really sure which way to go on this and would appriciate any help.

Below is a breakdown of what I have installed in my Logo10 heli.

Hacker A30-8XL|uBEC 6 volt|3 9650s|s9254|GY401|CC HV-45|

Thanks for helping a noob out.

[BarracudaHockey]

If you were to fly two of them back to back, one on 5.3 and one on 6 volts, both regulated, I doubt you would be able to tell much difference. I run 5.3 on all my helis including a 90 size scaler and an Avant.

[MicroMan]

Thats cool, how do you build a regulated system?

[BarracudaHockey]

I use Duralite batteries with Radio South 5.3V switch safe regulators. Its pretty plug n play. You need a duralite charger for the duralite batterires. People like Fromeco stuff too, I'm just comfortable with the stuff I've had good luck with.

[MicroMan]

Im still trying to sort out this whole bec thing and Ive got more questions. I think I figured out the whole Regulator thing but I noticed becs come in different flavors, 6v, 5v etc.

I currently have 6v uBEC in my heli since I'll be using 9650s on the swash and a GY401/s9254 combo, should I be using a 5v ubec instead of my 6v ubec.

Does the ubec determine what your electrical system is 6v vs 5.3 volts.

[Seeker]

UBEC (or BEC) stands for Universal Battery Elimination Circuit. It allows one to replace the batteries required to power the reciever and all the other electronics. When you are running an electric bird you use the BEC to take some of the "pressure" off of the ESC (Electronic Speed Controller). The ESC does not have to supply power to the reciever circuit if a BEC is used. (Just a level set for others) :)

The UBEC (BEC) then controls the reciever ciruit voltage. There are ways to run multi voltages but I think that's a little much.


For what it's worth, I run my BEC on my Trex at 5.3 volts 401/9650 on the tail.

On my Raptors, I run a 5 cell pack and I run the switch/regulator from radiosouthrc. The regulator does the same thing as the BEC as it limits the voltage from the 5 cells (5.3 volts again for me) but it does not eliminate the battery from the bird. The raptors are running the digitals on the swash and 401/digital on the tail.

Personally, I run at 5.3 volts... I think things run a little cooler and I'm not sure I'm good enough to notice any difference between them anyhow.

[Grubs]

If you have a regulated 6v UBEC and just want to run one servo as 5.3 volts then all you need is something like this already wired up for the heli: http://www.wattsuprc.com.au/product_detail.asp?pid=K10333A

Maybe try your LHS?

[MicroMan]

Thanks guys Im going to get a Duralite stepdown today.

[PaulW]

Err, Similar question, I am using 3 Futaba S9206 on the Cyclic and a S9254 on the tailof a T-Rex600, Futaba do not give sny specs for the performance of a 9206 on 6.0V, columns show N/A, As I have to step down for the 9254 should I just bin the BEC and use an uprated NiMh pack? I tried putting the supplied regulator between the BEC and the reciever (to try and drop the voltage to the whole system) but nothing worked. Putting the Regulator between the Gyro and the 9254 worked fine

[brettlw]

Use a 7.4 volt lipo for your receiver. (Nikes only add weight to the bird)
Plug the battery into the BEC. The BEC will drop the 7.4 down to 6 volts for the receiver. On the rudder out of the receiver put the 5.1 or 5.3 regulator and run it back to the tail rotor servo.