Twin opto esc's

[DHC Beaver]

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.

[Wildflyer]

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

[JetPlaneFlyer]

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.

[kyleservicetech]

Originally Posted by DHC Beaver

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?

[JetPlaneFlyer]

Originally Posted by kyleservicetech

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

[kyleservicetech]

Originally Posted by JetPlaneFlyer

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.

[DHC Beaver]

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.

[solentlife]

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 ...

Nigel