View Full Version : Phoenix 60 for Lepton, need an external BEC or NOT ?
vipul
07-11-2006, 11:48 PM
Guys,
I am running the 4S setup with Hyperion motor and cells. Question is that I got the medusa 2amp BEC and have the phoenix 60 esc however now I realize (after I cut the red wire from the phoenix 60,aargh) that the phoenix 60 has an internal 3 amp BEC. So the question is that should I use the internal BEC from the phoenix 60 or should I use the medusa 2amp. Again this is 4S setup..........Any advice would be appreciated.
Vipul
Finless
07-12-2006, 12:23 AM
I would use the 3 amp from the CC60. Why add weight with a external BEC and you get one more amp :)
Bob
vipul
07-12-2006, 12:51 AM
Hmmm, it sounds right finless but I see that Jeff from Hirobo was using the CC 60 on the 3S setup without a BEC but he recommends an external BEC with the CC on a 4S setup. I just don't understand why that would be the case ?? Jeff if you see this post, please reply.
Vipul
FrittsLogic
07-12-2006, 01:02 AM
Maybe as the supply voltage goes up (3s to 4s) the switching bec makes more noise that needs to be filtered out/suppressed to avoid glitches/lockouts. I saw this going from 4s to 7s on other helis. Same BEC, same receiver, etc. With 7s, lots of noise. The dedicated external BEC is probably a little more resistant to producing noise while switching than the ones built into ESC's
..BTW, anybody know where to get ferrite rings for cheap?
Finless
07-12-2006, 01:55 AM
Yep could be.... Or maybe the BEC in the CC is only to be used on 3S not 4S?
Bob
buster1
07-12-2006, 09:55 AM
Bob, I am running the same setup as you, except I am using a futaba 502 gyro and 9254 servo - will the 2amp Medusa BEC be sufficent,
Is the BEC really needed??
Finless
07-12-2006, 11:00 AM
If your running the Align 75 ESC as I am then yes you need a BEC as the ESC doesnt have a BEC. The 2 amp is fine for me with non digital servos and a 401.
Now I cant find the current drain of the 9254 servo so I really cant answer if 2 amps is enough? If it was me and I was unsure I would go 3 amp BEC.
When I go to the AT 94761 digital servos I will go to a 3 amp BEC.
Bob
I also have the Phoenix 60, and per the instructions, the 3A BEC is rated up to 6 cells with 4 high torque servos (and up to 8 cells if you really push it). Unless J.G. knows something we don't, then it should be okay.
TMoore
07-12-2006, 10:28 PM
Joe Ford from CC advises that you need an external BEC with 4 cells and digitals. I have the email to prove it because I asked the same question.
TM
If that's the case, my ESC is going back to rchover tomorrow. CC should update the instructions to prevent confusion over their product. Why make it available for download if it's not current to begin with? I'll probably get the Align 75A and Medusa 3.5A combo instead. It's a good thing I haven't soldered the connectors yet.
Finless
07-13-2006, 12:22 AM
Joe Ford from CC advises that you need an external BEC with 4 cells and digitals. I have the email to prove it because I asked the same question.
TM
Terry, I hope you are going to use 94761's as I flew one today (and a week ago as in my vid) and now that I am use the the bird with my basic HS85MG's, the 94761's were AWESOME! NO COMPARISON and I will be reccomending this servo to everyone for this bird.
That is without a doubt the BEST cyclic servo for this machine.....
Since you know AT people let them know that if this bird becomes popular they will sell a bunch more of these servos! I know I will be reccomending this servo for sure!
Bob
TMoore
07-13-2006, 02:42 AM
My machine has a full suite of 761's under the hood.
I don't see where CC is wrong about the BEC on their ESC. Jeff G at MRC says the same thing about 4S packs. If you just do the math, the current loadings can be pretty high with 4 digi's, an ESC, big motor and a gyro while you're trying to throw the machine around like you stole it. When I looked at the specs on the CC80, which BTW is fairly close to the specs on the CC60, I quickly felt like an external BEC was in order, besides I wanted to run the cyclics and gyro on regulated 6 volts and the CC won't do that.
I have the CC35's on my TRex's and the new software is masterful. I certainly wouldn't want to give that up to an Align ESC that you can't program with a computer and doesn't have upgrade capability. The CC35 was OK to start with but the software upgrades just kept making it better, IMHO.
TM
I just ordered a Jazz 55-10-32 ESC and Medusa 3.5A BEC.
As for the Phoenix 60, it's going back. A simple update to the servo usage table isn't too much to ask. If the BEC can't live up to its battery/servo rating when running digitals over 3S, that exception should be noted in writing. I really like the PC link feature though but not enough to keep it.