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Saturday 7/7/18

2018-07-07, 21:07 by Gary M Jones

I was at the field today between 14:00 & 15:00 all on my own , good flying too. There is a dead sheep along the fence line towards the gate from the pits, I saw the farmer so reported this to her. I hope no one had plans for a BBQ Smile .

Farmer …

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Speed controllers BEC

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Post by Stubbsy on 2012-01-18, 10:25

Whats the difference between a UBEC and an SBEC? and which would I need for a flying wing, or doesnt it really matter? there seems to be a bit of a price difference between the two!
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Post by Tim on 2012-01-18, 12:26

SBEC usually means switch mode - more efficient, more pricey.
For basic use, doesnt really matter - and besides, if youre using the BEC on the speed controller, your stuck with whichever type they have used arent ya.

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Post by Mark Barnes on 2012-01-18, 12:36

Well he could just disconnect the ESC BEC and run a separate one but on a wing not much point

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Post by Andy Sayle on 2012-01-18, 13:44

In RC marketing speak, the terms SBEC and UBEC mean about the same thing. (Ultimate Battery Eliminator circuitry and Super Battery Eliminator circuitry). And they both mean nothing in terms of specifying a power supply, they are just marketing bull....

First things first, how many servos, what size/type, and what are you powering them from (eg, 2s lipo, 4s Life etc)? That will help determin the amperage and voltage that the BEC needs to be able to cope with, and then you can choose your BEC accordingly.

All a BEC does is step down (or occasionally up) the voltage from a battery pack, to a suitable voltage for the receiver/servos etc. It allows through whatever current is needed by the rx/servos but crucially, it has maximum safe limits in terms of input voltage and current handling capability. Traditionally, BECs were based on linear voltage regulators (basically hefty resistors/transistors) that reduce the voltage by passing it through a resistor. This creates a lot of heat, which must be got rid of, or it goes pop. The ability of a linear BEC to get rid of the heat, ultimately sets its current handling capability. Linear BECs are not very efficient, especially when dropping large voltages.

Now Switch mode BECS (sometimes branded UBEC, SBEC etc) work in a different way. They drp the voltage down by switching it on and off very quickly, which is a far more efficient way of doing things. This leads to much less heat build up, and much improved current handling capabilites. It is also more expensive.

Andy

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Post by Roy on 2012-01-18, 13:48

Andy Sayle wrote:In RC marketing speak, the terms SBEC and UBEC mean about the same thing. (Ultimate Battery Eliminator circuitry and Super Battery Eliminator circuitry). And they both mean nothing in terms of specifying a power supply, they are just marketing bull....

First things first, how many servos, what size/type, and what are you powering them from (eg, 2s lipo, 4s Life etc)? That will help determin the amperage and voltage that the BEC needs to be able to cope with, and then you can choose your BEC accordingly.

All a BEC does is step down (or occasionally up) the voltage from a battery pack, to a suitable voltage for the receiver/servos etc. It allows through whatever current is needed by the rx/servos but crucially, it has maximum safe limits in terms of input voltage and current handling capability. Traditionally, BECs were based on linear voltage regulators (basically hefty resistors/transistors) that reduce the voltage by passing it through a resistor. This creates a lot of heat, which must be got rid of, or it goes pop. The ability of a linear BEC to get rid of the heat, ultimately sets its current handling capability. Linear BECs are not very efficient, especially when dropping large voltages.

Now Switch mode BECS (sometimes branded UBEC, SBEC etc) work in a different way. They drp the voltage down by switching it on and off very quickly, which is a far more efficient way of doing things. This leads to much less heat build up, and much improved current handling capabilites. It is also more expensive.

Andy

Quiet in work Andy confused

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Post by Andy Sayle on 2012-01-18, 13:51

A little Smile

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Post by Mark Barnes on 2012-01-18, 14:09

Andy Sayle wrote:A little Smile

You can work through my backlog then

M

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