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Old 04-18-2007, 04:22 AM   #1 (permalink)
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Join Date: Mar 2007
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Default Separate BEC

Hi All! I'm planning to get a Trex SE V2, HS-65MG for cyclic, 9650 for tail, and Gyro 401. I think I read somewhere that you need a separate BEC/UBEC in this kind of setup since sometimes the ESC cannot supply enough power to the receiver. Is this true? Can the standard ESC that is included in the kit supply enough power to the receiver? If I need one which UBEC do you recommend? Thanks in advance.
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Old 04-18-2007, 05:34 AM   #2 (permalink)
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You don't need one, but many people run one. I use a ParkBEC 6V. The volts speeds up the servos at the expensive of possibly shorter servo life.
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AMA#47402, IRCHA # 3395
Blade CP "Pro", Trex 450SE, PiccoZ, Quick of Japan EP8v2 EX, Hurricane 550, Hurricane 200, JR Vibe 50, Blade mCX, Bergen Intrepid Gasser, Pantera 50, Blade mSR, Novus CP
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Old 04-18-2007, 05:35 AM   #3 (permalink)
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You only need a separate BEC if:

* You run a 4S setup
* You run digital swash servos

otherwise the BEC in the Align 35A ESC will be just fine. If you want an external BEC for the T450 then the DimensionEngineering ones are very good and very simple to use: http://www.dimensionengineering.com/ParkBEC.htm or http://www.dimensionengineering.com/SportBEC.htm

Otherwise there are lots of sub-$20 switched-mode BECs around these days, eg http://wattsuprc.com.au/product_detail.asp?pid=EW-UBEC
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* MSH Protos Stock motor/15t/Align75/Align DS510/GL730+DS520/7s A123 2300
* TRex450CF/430L/12t/CC45/HS65mg/L2100T/KP 3s 2200 25C or 4S LiFe
Previous rides: HX242, W5-4, TRex450(HDE), TRex450(SE), QJ-EP8v2, BCX2 ,Logo10, Hurricane550
SIM: Phoenix (previously also Reflex/XTR, ClearView, RF, FMS)
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Old 04-18-2007, 08:19 AM   #4 (permalink)
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Thanks. I guess my setup will do while I'm learning. So if I understood you correctly, it is ok to fly the trex without the separate BEC. And it won't contribute to it crashing or glitching just because the power to the receiver/servo is not enough.
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Old 04-18-2007, 08:32 AM   #5 (permalink)
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If you are running a 3S (11.1V) lipo with this: Trex SE V2, HS-65MG for cyclic, 9650 for tail, and Gyro 401 then that's right, the built-in BEC will be just fine.
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Kenneth
* MSH Protos Stock motor/15t/Align75/Align DS510/GL730+DS520/7s A123 2300
* TRex450CF/430L/12t/CC45/HS65mg/L2100T/KP 3s 2200 25C or 4S LiFe
Previous rides: HX242, W5-4, TRex450(HDE), TRex450(SE), QJ-EP8v2, BCX2 ,Logo10, Hurricane550
SIM: Phoenix (previously also Reflex/XTR, ClearView, RF, FMS)
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