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02-09-2008 05:28 AM  10 years agoPost 21
stcyr

rrNovice

Laurel, MD

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In your case, you can't blame the output transitors for the ESC's failure. Going to a 35 amp ESC isn't going to fix the overheating problem associated with a built in linear BEC. It might run cooler overall which helps but the problem is the type of BEC built into ESC's.

This is copied from Dimension Engineering's website:

It is very common for speed controls to have BECs rated at 2 or 3A. However, what the manufacturers do not tell you is that this rating is only true for an input voltage of 6V. The BEC on your speed control is what engineers call a 'linear voltage regulator'. It works by burning up excess voltage and turning it into heat. The higher the input voltage, the more heat gets produced. If there is too much heat, then the BEC will either fry, or shut down! The result of this is that in real world situations, if you are running a 3S lipo battery pack, your ESC's BEC will only be able to provide about 0.5A before it overheats. At 4S, most ESC manufacturers don't recommend you use the BEC at all, or at best power two small servos.

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02-09-2008 05:42 PM  10 years agoPost 22
BOB WHO?

rrKey Veteran

Downey, Ca.

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stcyr-
I am starting to get the picture. So in place of built-in becs are you saying that separate becs selected for each particular project are better? And if this is true could you explain why? Thanks!

Bob

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02-09-2008 06:49 PM  10 years agoPost 23
Gregor99

rrElite Veteran

Western Wa

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I believe he is saying that built-in BECs are bad because they are linear. Most of the seperate BECs are the "switching" type which are more efficient, cooler and able to deliver thier rated current at higher input levels. Be aware that there are also seperate BECs that are linear. The Align BEC is linear, so it may not be that much of an improvement over the built-in BEC, except for a slightly higher quality of parts involved.

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02-09-2008 08:09 PM  10 years agoPost 24
Texas Dar

rrApprentice

Branson-Hollister Mo. USA

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I got this BL, http://www.xheli.com/ek5-0006.html, And ordered this ESC,http://www.xheli.com/60aspco.html, for my HBK-2. What BEC should I get, to avoid any chance of taking out the ESC? Makes good sense keeping the ESC as cool as we can,evan thoe it has one. And where? My Futaba 6EX will be here in 3 days, so the stock unit will come off today.So far, thats the only stuff not stock on my King.

Mommy Said, I Can "Come Out & Fly With You Guys"

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02-10-2008 12:20 AM  10 years agoPost 25
stcyr

rrNovice

Laurel, MD

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Anyone flying electric should avoid the linear BECs. The ParkBEC is the lightest and the most popular. There's a lot of good info on their website also. I order directly from them: http://www.dimensionengineering.com/

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