Quark

[BrianG]

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.

[JERRY2KONE]

Thanks for the elementary education BG. Just listening to you seasoned vets spew the knowledge that is built up in there is really something. What is cool about the RCM forum is that there are several sources and opinions throwing their hats into the ring all at once virtually educating the rest of us every time you place a reply to one of these threads. I am a retired Naval engineer and I am still learning things every day on here about simple thing that I either have not used in years, or just did not know. I for one am greatful for what you guys have to share with us. Thanks BG, Serum, Sikes, and the rest of you as well. This site rocks with a great deal of knowledge and experience. Keep up the great work guys.