Servo Shopping.

[89Industries]

Yep and I've never had one fail.

Surely your ESCs have an internal BEC that is only sending 6 or 7.4v to the rx even when using a 3s battery?

HW1080g2 allow you to set the BEC as high as 8.4v but almost all the others I have seen are mostly 6v max.

I've also noticed my dumbo and radiolink rx can go up to 10v. Still shy of full 3s voltage though.

 

[JatoTheRipper]

Surely your ESCs have an internal BEC that is only sending 6 or 7.4v to the rx even when using a 3s battery?

HW1080g2 allow you to set the BEC as high as 8.4v but almost all the others I have seen are mostly 6v max.

I've also noticed my dumbo and radiolink rx can go up to 10v. Still shy of full 3s voltage though.

I'm not sure if that's how internal BECs work to be honest. Never thought of it until now that you asked! There's a reason we used to pull the power wire to the ESC when using external BECs.

 

[HahnsB2]

Yep and I've never had one fail.

Didn't know that was a thing. I've always just powered them with the ESC, and I think 8.4 is the max available from anything I've used. I realize people want more power for less money these days, the motor in the 9381 is massive which is were the efficiency comes from (and the price), one of the employees said it's capable of making way more power than what they've limited it to, they just don't trust the gear set that high. They've since come out with the DB961WP a couple years ago, which has 763oz/in, so they can now make a gear set to handle higher torque, not sure why they haven't combined it with the 9381 motor, as the 961 draws 6.5 amps. It's cheaper and makes more power, but the other factors are more important to me.

 

[89Industries]

I'm not sure if that's how internal BECs work to be honest. Never thought of it until now that you asked! There's a reason we used to pull the power wire to the ESC when using external BECs.

Go put a voltmeter on the + and - pins of the receiver in any of your trucks (after you plug in a 3s battery and turn it on of course).

It will show you the voltage being sent by the internal BEC of your esc to the rx. I'm going to make an educated guess and say that the voltmeter will show 8.4v or less when running a 3s battery.

Yes, if you're running an external bec from the battery to power your receiver, you will need to pull the red wire from the esc receiver plug so that you don't double the voltage since it would come from two sources.

From what I can tell, if not going direct power on the servo, the benefit of an external bec instead of the internal esc bec would be amp draw. Internal BEC on esc seem fairly underpowered and likely the reason it has made direct power servo the way to go. Direct power is certainly as clean or easy as adding an external bec. But HahnsB2 was suggesting that with the Hitec you don't need any of that stuff which though the servo is expensive actually makes for a clean, efficient and good option. And if Hitec is actually accurate or conservative with their torque ratings this seems like a very viable option.

I recently went through a lot of this because putting in the castle mamba micro x2 in the Datsun I found that esc has a 5v internal bec. I didn't want to spring for a direct power servo at the moment but the Amazon cheapo ds3235pro servo I have had good luck with (and already have one) can go up to 8.4v and does plenty well at 7.4v, but it's lackluster at 5v. So I bought an 8.4v bec and an RX bypass adapter from Holmes to power the servo directly from the battery at proper voltage. I still use the 5v internal esc BEC to power the Rx though.

 

[JatoTheRipper]

Didn't know that was a thing. I've always just powered them with the ESC, and I think 8.4 is the max available from anything I've used. I realize people want more power for less money these days, the motor in the 9381 is massive which is were the efficiency comes from (and the price), one of the employees said it's capable of making way more power than what they've limited it to, they just don't trust the gear set that high. They've since come out with the DB961WP a couple years ago, which has 763oz/in, so they can now make a gear set to handle higher torque, not sure why they haven't combined it with the 9381 motor, as the 961 draws 6.5 amps. It's cheaper and makes more power, but the other factors are more important to me.

That's why options are good. People don't have the same requirements and priorities in products.

Go put a voltmeter on the + and - pins of the receiver in any of your trucks (after you plug in a 3s battery and turn it on of course).

It will show you the voltage being sent by the internal BEC of your esc to the rx. I'm going to make an educated guess and say that the voltmeter will show 8.4v or less when running a 3s battery.

Yes, if you're running an external bec from the battery to power your receiver, you will need to pull the red wire from the esc receiver plug so that you don't double the voltage since it would come from two sources.

From what I can tell, if not going direct power on the servo, the benefit of an external bec instead of the internal esc bec would be amp draw. Internal BEC on esc seem fairly underpowered and likely the reason it has made direct power servo the way to go. Direct power is certainly as clean or easy as adding an external bec. But HahnsB2 was suggesting that with the Hitec you don't need any of that stuff which though the servo is expensive actually makes for a clean, efficient and good option. And if Hitec is actually accurate or conservative with their torque ratings this seems like a very viable option.

I recently went through a lot of this because putting in the castle mamba micro x2 in the Datsun I found that esc has a 5v internal bec. I didn't want to spring for a direct power servo at the moment but the Amazon cheapo ds3235pro servo I have had good luck with (and already have one) can go up to 8.4v and does plenty well at 7.4v, but it's lackluster at 5v. So I bought an 8.4v bec and an RX bypass adapter from Holmes to power the servo directly from the battery at proper voltage. I still use the 5v internal esc BEC to power the Rx though.

It's not even on my mind so probably won't happen.