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BrianG · 01.31.2008, 02:33 PM

Yeah, the some of the newer ESCs have built-in UBECs, but the Quark and MM definitely use linear regulation.

And yes, runtime does increase. In a linear BEC, the output current is what is being drawn from the main batteries no matter what the voltage difference is. A UBEC is more of a "power transformer".

For a 5s battery setup and say you have a 3A servo load:

- In a linear regulator, the current being pulled from the main batteries is the same as the current on the linear regulator output, 3A in this case.
- In a UBEC, the current being pulling from the main batteries is only around 1.29A (figuring in a 25% efficiency loss - but it's usually a little better than that). That's less than half the current, so runtime will increase a little.

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BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	01.31.2008, 02:33 PM Yeah, the some of the newer ESCs have built-in UBECs, but the Quark and MM definitely use linear regulation. And yes, runtime does increase. In a linear BEC, the output current is what is being drawn from the main batteries no matter what the voltage difference is. A UBEC is more of a "power transformer". For a 5s battery setup and say you have a 3A servo load: - In a linear regulator, the current being pulled from the main batteries is the same as the current on the linear regulator output, 3A in this case. - In a UBEC, the current being pulling from the main batteries is only around 1.29A (figuring in a 25% efficiency loss - but it's usually a little better than that). That's less than half the current, so runtime will increase a little.