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Can my BEC handle these four servos?

Old 03-13-2011, 07:56 PM
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bicyclemonkey
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Default Can my BEC handle these four servos?

Here's my ESC with built in switching BEC

TURNIGY Plush 80A w/ UBEC Speed Controller

And here are the servos I'm considering:

Hitec HS-5485HB

Will my BEC be able to handle four of those servos?
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Old 03-14-2011, 01:50 PM
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Larry3215
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I would not recommend running those 4 servos on the internal BEC.


Those are digital servos and can easily pull a couple of amps or more each. I would use a 10 amp external UBEC or an rx battery pack.
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Old 03-14-2011, 02:05 PM
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Trammellc2001
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Sure would be nice if the servo manufactures would list power consumption specs. Both loaded and unloaded specs.
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Old 03-14-2011, 02:08 PM
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Larry3215
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Hyperion is one of the very few who does list that in the specs for their digital servos.

Good servos at a good price too.
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Old 03-14-2011, 06:03 PM
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FlyingBrick50
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Default ubec

From what I understand from the fine folks here at Wattflyer you would be better off with a ubec as mentioned earlier, especially running digital servos. Less chance of brownouts as well.
I sure don't like the reviews that esc are getting!
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Old 03-14-2011, 06:36 PM
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bicyclemonkey
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Originally Posted by FlyingBrick50 View Post
From what I understand from the fine folks here at Wattflyer you would be better off with a ubec as mentioned earlier, especially running digital servos. Less chance of brownouts as well.
I sure don't like the reviews that esc are getting!
Yeah, that ESC states it will only go up to 7s lipos. I need to run 8s on my plane so I won't be using that ESC.

It seems most of the ESC's I'm finding are only rated up to 6s or 7s lipo batteries.
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Old 03-14-2011, 07:31 PM
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FlyingBrick50
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Smile Aircraft?

May I ask what type aircraft that your using this set up on, man thats alot of voltage,...WOW Love it
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Old 03-14-2011, 08:02 PM
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bicyclemonkey
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78" Tiger Moth

Hobby Lobby recommended 10s but the motor I picked out will do 1400w on 8s with an 18x10 prop.

I found several ESC's on hobbyking that will do up to 7s, so I may try that...but I'd like to have extra power just in case.
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Old 03-14-2011, 09:10 PM
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rcers
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By the way, your ESC listed above will smoke at 8s voltages. It is a 6s ESC as you point out.

When you go with 8s you really need to invest in a good ESC. The high voltage ones cost a bit of dough, but you need that for reliable operation.

And for a plane that large I would use 2s LiFe packs. They are 6.6v and work very well. They do have a steep voltage drop so get a pack large enough and charge it regularly.

Mike
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Old 03-14-2011, 10:02 PM
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FlyingBrick50
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Default Nice

Thats one good looking bird, love too see a video of the maiden flight, (out of my budget range), still love watching them fly when I can.
78" wingspan, 65-3/4" long, 1,842 sq. in. wing area (12-3/4 sq. ft.), 14-1/4 lbs. flying weight
How much thrust are you expecting to develop from your setup?

never mind I see now , 1400w on 8s with an 18x10 prop
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Old 03-14-2011, 10:15 PM
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Lightbulb ESC

Maybe this would do the trick,


X-75 Opto Pro ESC
The X-75-Opto Pro was specifically designed with 3D Aircraft and Helicopters in mind. This ESC is designed for up to 10s Lipo (42V) and has a large heatsink to deal with the high performance demands of these types of aircraft. Great for use on 5 - 10s Lipo in high burst applications.
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Old 03-14-2011, 10:45 PM
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bicyclemonkey
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Here's the motor I have for it:

TURNIGY 50-65D 270kv Outrunner.

A few of the reviewers are running 8s with an 18x10 prop with a stated wattage of 1400+ pulling 47-53 amps...

Sooooo, I was thinking of using this ESC:

BP 70A Brushless ESC


Do you have a link for the one you listed, FlyingBrick?
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Old 03-14-2011, 10:46 PM
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Dr Kiwi
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One of these says 80A 10s: http://www.graysonhobby.com/Grayson_Welgard_Advance.pdf
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