Thread Tools
Jun 07, 2002, 06:18 AM
Registered User
RonJ's Avatar

What happens when you overload your BEC/ESC ?

Installed a 3:1 geared Endo and 11 x 6.5 folder on my stress reinforced Dymond Crazee. With 8-2000SCR's it pulled 47 amps on the ground. I have a 50 amp BEC/ESC. Launches great but after seconds in the air the servos lock to full up and right aileron. I cut the throttle and control is returned but the plane stalls. To recover from the stall I hit the throttle and control is lost again. This has resulted in losing two wing panels, two fuselages, and some grey hair on the back of my head. Range checks perfect before and after crashes.
Does an unloaded prop draw more amps which overloads the BEC/ESC ? HELP
Sign up now
to remove ads between posts
Jun 07, 2002, 08:45 AM
Registered User
Andy W's Avatar
No, in-flight loads are lower than static (unless, perhaps, in extreme circumstances). You are well within operating limits, although not all 50A esc's are created equal. It may, however,be interference, not an overload condition, but it's hard to tell..
Jun 07, 2002, 09:38 AM
Registered User
Jim Ryan's Avatar
If you're losing control that quickly, I believe this points to an interference problem as Andy noted. Even if you exceed limits on a BEC-type ESC, it will typically take a little time for the components to overheat.

BTW, it's worth noting that there are a couple of ways to induce failure in a BEC ESC. The first is to draw too much current on the motor side, thereby overheating the FETs. The other way is to draw too much current through the voltage regulator that's the heart of the BEC; if you use too many servos, or those servos are subjected to heavy loads, you might overheat the voltage regulator, causing it to fail.

Since you're regaining control as soon as you cut power to the motor, it's very unlikely that this is your problem.

I suggest you range check the plane, but this time with the motor running at various power settings. It may be that you need more noise suppression. Another option on a plane this size is that you could switch to an opto-isolated ESC and use a separate receiver battery.


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion What happens when you hit your 1000th post? rob mueller Life, The Universe, and Politics 42 Jan 13, 2007 06:49 PM
Discussion Bill Hempel Saves one -- what happens when you lose half of your wing? byrocat Giant Scale Airplanes 3 Jul 15, 2006 08:50 AM
Discussion Bit OT -- what happens when you lose half of your wing? byrocat 3D Flying 16 Jul 14, 2006 10:34 AM
What happens when you run out of model memory on your Transmitter??? Ralph_D Parkflyers 27 Dec 20, 2003 07:50 AM
This is what happens when you run too many amps through your ESC... thomer Power Systems 23 Aug 26, 2003 09:51 AM