First E5. First build

[curmudgeon]

I would think you would want to run them at the highest voltage you can to lower the current draw.

I am familiar with how voltage and current are inversely related according to Ohm's Law.  However, it is my understanding (or maybe misunderstanding) that increasing the output voltage on a BEC increases the power/wattage at which the servos operate, which in turn increases the output current demands of the BEC.  Could someone clarify this point?

[James F]

WR super bec pro with 20amps continous and 22 or so spikes works great for my power hungry savox.

[Greg Jackson]

Rodney is right.  Recently spoke to Dave at anything heli about this and in the future I will use 8.2v (my option for my unit, other becs might have 8.4 or 8.0)

[curmudgeon]

I got off the phone about an hour ago with Clint from Castle.  He told me that in the team's experience with the Futaba HV servos, there was not much improvement by going higher than 7.5V on the BEC Pro, but that the servos did get hotter with increasing voltage above 7.5V.  So recommends sticking with 7.5V output voltage.

He mentioned that both BK and Castle team pilots are using BK coreless HV servos with the BEC Pro (on 6S) without issues.

A point he reiterated is to run the BEC Pro off 6S on a 12S system.

[Chris Sexton]

BK Servo/Castle BEC pro on (2) E7s and an E5 556.  7.5v is where it's at.  Never a failure, never a blink even.

[curmudgeon]

BK Servo/Castle BEC pro on (2) E7s and an E5 556.  7.5v is where it's at.  Never a failure, never a blink even.

Thank you Chris for confirming that the coreless BK 7001HV/7005HV servos work well with the CC BEC Pro.

[Greg Jackson]

One question concerning 7.5 or higher though. When running a 2s lipo (on my e7se),  that is 8.2v or more. My BK servos never got warm even in hot temperatures and not much rest in between. I'm sure they have scientific data but just something I observed in the field.  I did fly my E5 on the bec pro at 7.5, but now running a scorpion esc with a good strong internal bec (the new 120). I will do some bench testing to see what happens at 8.2v when I get my new BK servos for the E5.

[Greg Jackson]

Mike, have you finished the build yet?

[Danny Dugger]

I would think you would want to run them at the highest voltage you can to lower the current draw.

I am familiar with how voltage and current are inversely related according to Ohm's Law.  However, it is my understanding (or maybe misunderstanding) that increasing the output voltage on a BEC increases the power/wattage at which the servos operate, which in turn increases the output current demands of the BEC.  Could someone clarify this point?

Curmudgeon is correct. It is true that for a given wattage as voltage increases, current decreases. BUT... Servos actually increase power output as more voltage is applied, this is why speed and torque specs improve as voltage increases. So, unfortunately, servos run at higher voltage will absolutely draw more current.

[Mikeunger]

Hello guys.

Just finishing up the build. Almost done. Waiting for a couple connectors and my batteries.

Then I will program everything final setup and fly 

BTW I ended up with a Quantum 4125-1100. We will see how that goes.

I am starting off with a 12t pinion and yes I am planning in running the servos at 7.4 volts.

Here are some pics. I put the blades on and canopy because I wanted to see it all together.

[Mark Burberry]

Looking good.

The only thing you need to change from what I can see is your main blade grips from trailing edge to leading edge control. Flip the blade grips over so that the pitch arms are facing the other way for leading edge control.

Mark

[curmudgeon]

Good catch

[Mikeunger]

Thanks!

[Mikeunger]

Finished programming the 7200 tonight.  Not too difficult and I thought the directions were fairly easy to understand.

I am going to start with a 12T pinion for the initial flight and such and then consider the 14T later.

Next up is the ESC
I am running a CC Phoenix Edge HV 120.  I am a sport flyer, loops rolls, flips, inverted.  Any suggestions for ESC setup?

Thanks.

[Greg Jackson]

I would recommend the castle bec pro for the edge 120.  Should work fine.