Thread Tools
Old Mar 19, 2003, 07:02 PM
davidleitch is offline
Find More Posts by davidleitch
Tragic case
davidleitch's Avatar

Overload controller and ultimate bec?

Lets say you have a 40 amp controller and are using the UBEC.

Now for some reason (you run 80 amps through it) the controller shuts down, will the UBEC continue to function?

I am actually only running 60-70 amps according to Motocalc (hacker b407L 15x10 and 8x1700). Since it will only be on for 10-15 seconds it should be allright, but sure don't want to lose any more planes due to equipment failure.

Sign up now
to remove ads between posts
Old Mar 19, 2003, 09:11 PM
Doc Data is offline
Find More Posts by Doc Data
Registered User
Yes, the UBEC will continue. It has nothing to do with the controller and is actually a bypass circuit that is a direct feed, stepped down to Rx voltage, directly from the battery pack to the Rx.

Old Mar 19, 2003, 10:24 PM
Daveairway is online now
Find More Posts by Daveairway
Registered User
"Now for some reason (you run 80 amps through it) the controller shuts down, will the UBEC continue to function? "

It depends on why the controller shut down. Thermal protection or a short ?

I have used an "old rule of thumb" that anything over 40 amps (was 20, then 30, now 40 amps) should use a rec battery, not BEC. Even a UBEC may be applicable.

My concern, is that as the amps increase, failures are more likely for the batt pack, esc, or motor. A dead batt pack will still cause the UBEC to quit.

I have had a brake FET short in a brushed ESC that dumped the battery really fast, but this happened on the bench and not in the air. So as I watched the batt smoke I realized there was a problem.

If you use a BEC or UBEC and the motor seems low on power, shut the throttle off and land.

It is a tough call,

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
NEW PRODUCT ANNOUNCEMENT - The Ultimate BEC Jeff Meyers Aircraft - Electric - Airplanes (FS/W) 27 May 27, 2002 10:43 PM
Second Battery & Ultimate BEC Gary U. Electric Sailplanes 0 May 07, 2002 11:33 AM
How to convert Jeti 70-3P BEC BL controller to non-BEC? Magna Electric Plane Talk 23 Mar 22, 2002 08:24 AM
Ultimate BEC Jeff Meyers Electric Plane Talk 2 Feb 28, 2002 01:13 PM
Aveox L260 Brushless Controller W/BEC (NIB) Ed Lyerly Aircraft - Electric - Airplanes (FS/W) 3 Jan 19, 2002 12:08 PM