bicyclemonkey

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?

Larry3215

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.

Trammellc2001

Sure would be nice if the servo manufactures would list power consumption specs. Both loaded and unloaded specs.

Larry3215

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.

FlyingBrick50

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!

bicyclemonkey

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.

FlyingBrick50

May I ask what type aircraft that your using this set up on, man thats alot of voltage,...WOW Love it

bicyclemonkey

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.

rcers

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

FlyingBrick50

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

FlyingBrick50

Maybe this would do the trick,

bicyclemonkey

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?

Dr Kiwi

One of these says 80A 10s: http://www.graysonhobby.com/Grayson_Welgard_Advance.pdf