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Power Systems Talk about motors, ESC speed controllers, gear drives, propellers, power system simulators and all power system related topics

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Old 12-22-2012, 05:37 AM   #1
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Default Twin opto esc's

Hi,all.I would like to use two 50A opto esc's I have to power my twin.I will use 2 3000mah lipo's in parralel.
Do i still need to remove the red wire from the esc to receiver connection?These will have to be on a Y-connector of course.
I will use a 2-cell LiFepo pack for the rx and servo's.
I know a separate sbec would be lighter,but I have a feeling I'm going to need nose weight anyway,so I might as well make it work for a living.The aircraft is the Focke-Wulf 19 Ente I mentioned in another post.
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Old 12-22-2012, 08:40 AM   #2
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If the ESC's have a BEC (battery eliminator circuit) I disconnect the red lead when I use a flight pack battery. If they do not, then there is nothing to worry about.

In your case with 2 ESC's on a Y, and a separate flight battery of 2s Life which I think will put out 6.6 v, I would disconnect both red wires before they plug into the Y lead, if they have BEC's.

If you only disconnected the red from the Y lead to the RX, the 2 BEC's could sort of screw each other up. (don't need that)

2 --50 amp ESC's sounds like a nice plane, tell us about it. Good luck

Dave R, Proud PGR rider.
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You become a master at repair.
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Old 12-22-2012, 09:00 AM   #3
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The ESC's are OPTO (meaning no BEC) so you don't need to remove the red wire.

Just a thought and maybe too late, but would it not have been better to run the batteries in series (or get a 4s battery)? The higher voltage would have meant you could have halved the amps for the same power and so then used smaller/lighter/cheaper ESC's and lower kv motors.. This would give slightly lighter weight overall and better efficiency from the motors for the same power.
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Old 12-22-2012, 05:57 PM   #4
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Default

Originally Posted by DHC Beaver View Post
Hi,all.I would like to use two 50A opto esc's I have to power my twin.I will use 2 3000mah lipo's in parralel.
Do i still need to remove the red wire from the esc to receiver connection?These will have to be on a Y-connector of course.
I will use a 2-cell LiFepo pack for the rx and servo's.
I know a separate sbec would be lighter,but I have a feeling I'm going to need nose weight anyway,so I might as well make it work for a living.The aircraft is the Focke-Wulf 19 Ente I mentioned in another post.
How many cells are in your two 3000 mah LiPos?

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Old 12-22-2012, 06:15 PM   #5
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Originally Posted by kyleservicetech View Post
How many cells are in your two 3000 mah LiPos?
Good question... I somehow read it that they were 2 cell packs but i see that nowhere did it actually say that.. i must have dreamed it
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Old 12-22-2012, 06:24 PM   #6
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Originally Posted by JetPlaneFlyer View Post
Good question... I somehow read it that they were 2 cell packs but i see that nowhere did it actually say that.. i must have dreamed it
Yeah, same here, till it was re-read, and those two cells were for the LiFe receiver battery.

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Old 12-22-2012, 11:48 PM   #7
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The 3000 mah packs are 3-cell Zippy packs.The motors are hextronic 4023 850kv bell motors.I want to swing 11x5.5 props with them,counter rotating.
The reason i want to use the 2x50A esc's is because I have those in my drawer.I don't have a matching pair of smaller ones.
This is the aircraft in question:
http://www.wattflyer.com/forums/showthread.php?t=69046
Thanks for the clarification re the red wire,folks.
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Old 01-18-2013, 10:18 AM   #8
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I use twin 50A optos on my HK Parkjet ...

I use a single LiPo - but principle is same. Power into both Opto ESC's, then ESC's Rx leads to Y lead to Rx throttle ch.
I use a separate BEC that is connected to the LiPo power lead before the ESC's .. this plugs into a spare Rx ch to power the system.

Nothing else to do as long as opto ...

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