View Full Version : BEC's
jmiceli11
12-02-2007, 11:56 AM
Well I have everything ready to go for my Logo 600 3Dm or so I thought. I need a BEC. It seems that the Western Robotics Hercules is the way to go. Right now Readyheli is out of the 5 amp High Voltage model. Would the one that can provide 3 amps be enough? The radio gear I am going to run is:
Futaba 9451 x3
Futaba 9256
V-Bar.
Actro 24-4
Jazz 55-10-32
Futaba G3 receiver until the 2.4 is released
10s 1p EVO 3700
If this isn't enough BEC who else sells them?
Thanks,
John
Flybar-less
12-02-2007, 04:18 PM
The 6 Volt 6 amp Ulimate BEC is also a good choice. Available online at Hobby Lobby.
hopntod
12-02-2007, 04:40 PM
Do you mean that the 3.5 amp will not suffice?
Todd
I was running a 3.5 amp WR bec at the time this picture was taken. Spektrum ar7000 reciever with hitec 6965's and 9256. Reciever shut down from a low voltage condition near as I can tell, after doing roughly two minutes of continous tic tocs.
http://img.photobucket.com/albums/v325/NTM95/IMG_0928.jpg
I'm running dual WR 5 amp bec's and a spektrum capacitor as well now.
hopntod
12-02-2007, 08:45 PM
That is not very encouraging.I just got the 3.5 to install on a L-10 using 9650s and a 9254 with a Futaba rx.I am just on the road to nose-in hovering so tic-tocs and the like are not anywhere in the near future for me.
Todd
This was on v-bar with full size servos, big difference there.
I ran a 3.5 amp on a flybar logo 14 with 9650's for 2 years with no issues.
OICU812
12-03-2007, 12:02 AM
www.rcflightstore.com (http://www.rcflightstore.com) has the 5amp ones in stock at the moment. As Nathan said on the mid size the 3.5s are perfectly fine, abit more red line on the full size stuff though. I had a couple of the Koolflight ones fail on me so those are not an option at all for me anymore.
BruceW
12-03-2007, 01:15 AM
www.rcflightstore.com (http://www.rcflightstore.com) has the 5amp ones in stock at the moment.
They are showing out of stock at the moment and I even checked earlier today since I'm looking for one also.
OICU812
12-03-2007, 02:07 AM
Oh for pete sakes, lol.
Ok here we go, some other places, "in stock" for the moment.
http://www.helidirect.com/product_info.php?products_id=4666
http://www.megamotorusa.com/
BruceW
12-03-2007, 02:21 AM
OK, ordered mine from HeliDirect.com. Hopefully it was really in stock.
Now all I need is the Jazz 80 and FP EVOlite 5350 (to finish my build) but know where to get those. I would have liked to order from Readyheli but they've been out for a while now.
OICU812
12-03-2007, 03:26 AM
OK, ordered mine from HeliDirect.com. Hopefully it was really in stock.
Now all I need is the Jazz 80 and FP EVOlite 5350 (to finish my build) but know where to get those. I would have liked to order from Readyheli but they've been out for a while now.
The Jazz 80 is in stock at rcflightstore, the 5250 evolite....Espirit Models has them. Cheers.
BruceW
12-03-2007, 02:40 PM
Just got a notice that ReadyHeli has the WR 5Amp BEC back in stock. Oh well missed a $20 savings.
MrMel
12-04-2007, 04:47 AM
Just FYI, Ive been running a 3.5amp BEC on my .90 sized E-Stratus with 8717 servos & AR7000, so I really dont think that 3.5amp = crash straight away, I would inspect /replace all cables...
Perhaps Ive been super lucky for many many flights.
Anyway, Im installing the Fromeco's DC-Up on each machine now.
Team-MAYHEM
12-04-2007, 08:25 AM
Just FYI, Ive been running a 3.5amp BEC on my .90 sized E-Stratus with 8717 servos & AR7000, so I really dont think that 3.5amp = crash straight away, I would inspect /replace all cables...
It is the addition of the v-bar system that is frying these BEC's...I was told that several ways and 4 different BEC's were tried on DJ's setup and ALL of them shut down or fried...Just some thoughts
DJ uses 8717s on 6v, v-bar (imposes much much larger loads on the servos) and he is a mental pilot, thats no doubt why!
MrMel
12-04-2007, 09:08 AM
It is the addition of the v-bar system that is frying these BEC's...I was told that several ways and 4 different BEC's were tried on DJ's setup and ALL of them shut down or fried...Just some thoughts
Sorry, forgot to write, VBar:ed .90.... (Ion-X2 with VBar using the same setup)
OICU812
12-04-2007, 01:43 PM
Well I just will run (2) of the 5amp BECs for now, cheap insurance till I know exactly how much the 8717s really pull on 6Volts and Vstabi.
MrMel
12-05-2007, 09:59 AM
I stand corrected,
Ive been a lucky son of a *****.
I put the UberBEC that I was using into my CBA (computer battery analyzer), 4.5 amp no issue, 5 amps and voltage dropped to zero.
Phew.
I stand corrected,
Ive been a lucky son of a *****.
I put the UberBEC that I was using into my CBA (computer battery analyzer), 4.5 amp no issue, 5 amps and voltage dropped to zero.
Phew.
Holy cow !
Did the bec actually fry, or did it just overtemp and shutdown ?
I think it was heat build up in the bec that got me, the bec still works fine, but it definitally shutdown and down my heli tumbled. I couldn't replicate the failure on the ground though.
Hopefully the dual 5 amp units do the job.
MrMel
12-05-2007, 01:02 PM
It still works, just didnt like the load (voltage dropped), after load was lessen the voltage raised back up again.
Im getting a couple of 5A Western Robotics next week, gonna loadtest those as well, single and in paralell to see what kind of loads they can take.
Im getting a couple of 5A Western Robotics next week, gonna loadtest those as well, single and in paralell to see what kind of loads they can take.
Right on, that's the kind of information we need !
ozace
12-05-2007, 11:46 PM
http://www.flybarless.com/forums/showthread.php?t=242
I ran some regs a while back. It is surprising how hot they can get when pushed close to their rated limits. Some will drop volts some pop when pushed too hard.
What we really need to some figures of how hard a heli will push the volts and amps in flights. I often read about the averages of flights an the numbers are low, the peaks on the other hand must be high. Most of the high powered servos we are now using can peak over 2 amps each.