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700 Class Electric Helicopters 700 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 02-27-2018, 07:27 AM   #1 (permalink)
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Default Do most just run a BEC or anyone run seprate rx pack?

I just got a 700 class heli its a Logo 690, But it has the Castle creations 120 amp Ice 2 HV esc with a castle Pro BEC and just wondered do most run there 700s like this or do you run a separate RX pack.. The servos on mine are the BLSHV servos and shows online they need6.0V-8.4V so maybe that is why they went with the Pro BEC... but just wondered.
I had planned to add a RX pack to it if it didn't have a BEC cause in the ad online he didn't say anything about a BEC or if he did i missed it.
just wondered is it safe to just have the Power pack on board.

whats your thoughts and ideas on this.

Thanks
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Old 02-27-2018, 09:27 AM   #2 (permalink)
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The Castle BEC Pro is a decent unit and more than capable of supplying the electronics. In this scenario, an Rx pack is just unecessary extra weight and having to keep it charged is just an inconvenience. I would stick with the BEC.
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Old 02-27-2018, 10:20 AM   #3 (permalink)
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I run a BEC off speed control on my 700! I dont even have a backup guard, I trust Hobbywing 100%!!
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Old 02-27-2018, 11:51 AM   #4 (permalink)
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Cool, thanks for the reply

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Old 02-27-2018, 11:52 AM   #5 (permalink)
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Quote:
Originally Posted by Crashalotjoe View Post
The Castle BEC Pro is a decent unit and more than capable of supplying the electronics. In this scenario, an Rx pack is just unecessary extra weight and having to keep it charged is just an inconvenience. I would stick with the BEC.
Oh alright. I ran a separate 2 cell a123 pack on my trex600 but it was wired for a rx pack when I got it.

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Old 02-27-2018, 12:48 PM   #6 (permalink)
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I run BECs on all my helis. Either an external BEC similar to the BEC Pro or my preference these days is an HV ESC with built in BEC which keeps the wiring neater.
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Old 02-27-2018, 01:51 PM   #7 (permalink)
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I run the Hobbywing BEC, I have had good experiences. I run a small 2s lipo (<500Mah) as backup in case of battery or ESC issues.
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Old 02-27-2018, 02:41 PM   #8 (permalink)
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Originally Posted by daboxe View Post
I run the Hobbywing BEC, I have had good experiences. I run a small 2s lipo (<500Mah) as backup in case of battery or ESC issues.
Okay imma feel stupid but how do you also run a 2s lipo as back up?
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Old 02-28-2018, 04:28 AM   #9 (permalink)
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I'm a bit "belt and braces" when it comes to using BECs on large helis.

If I run a BEC, then I also run BEC guards (2x), and an Ultra Guard.

It makes it several times as expensive as an RX pack, but my new ESC has an excellent built in BEC so I might as well use it.
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Old 02-28-2018, 05:21 AM   #10 (permalink)
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Okay imma feel stupid but how do you also run a 2s lipo as back up?
You can do this but it is often necessary to put diodes in the BEC line to stop it being back-fed by the battery. You could also use a BEC guard instead of the diodes.

On the bigger heli's I use Ultra-Guards as the BEC back-up.
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Old 02-28-2018, 09:15 AM   #11 (permalink)
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Quote:
Originally Posted by Epoweredrc View Post
...Castle creations 120 amp Ice 2 HV esc with a castle Pro BEC...
This CC 120HV ESC has an internal BEC, but it is not meant to be used with large helicopters, so make sure to disable it by disconnecting the red wire.

The CC BEC Pro works very well, but it suffers from a few limitations. One limitation is the failure concern with high input voltage. Since you will most likely be using a 12S power system, the recommendation is to supply power to your BEC Pro with only the first 6S battery of the series. Not only is the 6S input "easier" on the BEC Pro than 12S input, but the lower input voltage yields higher current (see pic below). Another limitation is that the BEC Pro has a very small capacitor, so there is a possibility of voltage "dips" when performing demanding maneuvers with power hungry servos. This voltage dip may be more accentuated with coreless when compared to brushless servos. There are some servo brands that are known to have more power demands. You can minimize these potential voltage dips by connecting a ready-made and inexpensive 4700uF capacitor (pic below) to either the FBL unit or the receiver.





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Old 02-28-2018, 09:42 AM   #12 (permalink)
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This is an endless... but by no means pointless debate...
I run a separate 2S pack on all my helicopters that are 600 size and larger.... I just do not want to risk my helicopters because I did not want to get a separate powerpack....

Now granted I fly scale helicopters and I am not (too) concerned with extra weight... but even in my pod and boom trainer I prefer a separate powerpack to be safe...

but as with everything there are pros and con's ... especially in the hard core 3D world....

gh
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Old 02-28-2018, 11:39 AM   #13 (permalink)
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Quote:
Originally Posted by Epoweredrc View Post
Okay imma feel stupid but how do you also run a 2s lipo as back up?
I run the 2s lipo on a switch. The other end of the switch goes to the FBL (unused port). Plug in batteries, wait for FBL to initialize, turn on switch.

After flight, turn off switch, unplug batteries.
Cheap backup. Just be sure to run the ESC at the same voltage as you have the 2s battery charged to. I think all of mine are 8 volts or somewhere in that balll park.
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Old 06-15-2018, 08:12 AM   #14 (permalink)
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I'm planning on running the Hobbywing 25amp ubec, that comes with backup leads. I also have some 800mah two cell packs I was thinking of using for the backup pack. I would use it to power up the receiver before pugging in the main packs. Does this sound like a good setup?? Thanks.
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Old 06-20-2018, 06:48 PM   #15 (permalink)
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I use the hobbywing bec with a scorpion backup guard on my 700 and 550
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Old 06-20-2018, 10:31 PM   #16 (permalink)
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I currently have a 2100 mAh LiFe battery on my 700L. It works fine but I bought a Western Robotics BEC to install when i get around to it.
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Old 06-23-2018, 04:28 AM   #17 (permalink)
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I prefer the simplicity of a 2S lipo.
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Old 06-23-2018, 04:49 AM   #18 (permalink)
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Quote:
Originally Posted by Atomic Skull View Post
I prefer the simplicity of a 2S lipo.
Which is a good solution for sure.

Downside is that you have to find a space on the heli to put the battery, you have to remember to charge and maintain the battery, also it adds about 150g or so to the weight of the heli. Plus you do of course have to run 'true' HV servos capable of operating at 8.4V. None of these things are show stoppers by any means but they are considerations.

I prefer the even simpler solution of an ESC with a built in BEC. Having said that I've used a 2S LiPo in the past and it worked perfectly well, so it's down to individual reference.
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Old 06-23-2018, 05:35 PM   #19 (permalink)
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Depends on my heli size. On my 700, I use a 2s lipo with no BEC. I get 3 flights per charge. It is also nice for tuning because it is separate from the ESC. For my smaller heli's, I use a Western Robotics Hercules BEC. It is smaller than the Castle and works fantastic.
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Old 06-24-2018, 12:03 AM   #20 (permalink)
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I ALWAYS run a separate BEC on my machines (anything larger than a 450).

I run Western Robotics BEC's exclusively.

The BEC shown has a power bus, eliminating the bottleneck of one or two 5 amp servo style connectors limiting the current flow to the servos.
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