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T-REX 700 › 700E DFC HV with a BEC
08-06-2012 04:15 PM  6 years agoPost 1
HarveyR

rrVeteran

France - North

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Hi,

I'm looking into getting the 700E DFC HV, and I'm wondering if the WR Hercules Super BEC will provide enought current (I'd use it in 7.4 Volts I guess) for the load on the HV FBL servos ?

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08-06-2012 06:43 PM  6 years agoPost 2
jschenck

rrProfessor

La Vista, NE.

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You don't need a regulator with the HV servos. They are designed to run off straight 2S LiPo.

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08-06-2012 07:01 PM  6 years agoPost 3
Heli 770

rrProfessor

USA.

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That's if he wants to run a separate 2S Rx pack.

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08-06-2012 07:28 PM  6 years agoPost 4
HarveyR

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France - North

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Indeed Heli 770, I don't want a seperate 2S pack, I want to run the electronics of the power pack (12S).... that's why I asked about a BEC and not a Regulator. It's funny the number of people who mix them up!

So, any input from people using a BEC (44.4v -> 7.4v, like the WR Hercule Super BEC does)? The WR is rated for 10 amps continuous, is that enough for the DFC HV setup?

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08-06-2012 07:43 PM  6 years agoPost 5
Heli 770

rrProfessor

USA.

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Yes it is. If you used a 2S Rx. battery pack, you would need a 2300mAh/45C discharge rate pack to keep up with the BEC.

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08-06-2012 08:11 PM  6 years agoPost 6
HarveyR

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France - North

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Indeed, that's an interisting reply, which includes the explanation/demonstration to avoid me asking such a silly question again! Thanks Heli 770

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08-06-2012 08:17 PM  6 years agoPost 7
Heli 770

rrProfessor

USA.

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You'll be saving over 85grams in weight with the Super BEC.

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08-06-2012 08:29 PM  6 years agoPost 8
HarveyR

rrVeteran

France - North

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I'm a BEC fan and I was concerned about the HV question and am pleased to add another WR Hercule Super BEC in the cart (already have one om my 700E v1, it's great)

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08-31-2012 08:49 AM  5 years agoPost 9
HarveyR

rrVeteran

France - North

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Yes it is. If you used a 2S Rx. battery pack, you would need a 2300mAh/45C discharge rate pack to keep up with the BEC.
Sorry to pop this up again... but isn't something wrong here.

The WR Super Bec is rated 10 amps continuous, so that means it only takes a 2300mAh/5C to keep up (and not 45C), because 2.3Ah*5C=11.5 Amps continuous, and it would run for about 6 minutes (using 50% of the capacity, 12 minutes would fully empty the pack).

However, I gather people using RX packs usually get 2 or 3 flights out of them (so they are using 2 or 3 times less amps, so more like 4 or 5 I suppose), so I guess the WR Super Bec will be fine (and in fact it is, I've already got a few flights on it, but nothing hard yet)

Am I wrong here?

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08-31-2012 12:17 PM  5 years agoPost 10
Heli 770

rrProfessor

USA.

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HarveyR
My Bad, you are absolutely right!

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08-31-2012 01:47 PM  5 years agoPost 11
HarveyR

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France - North

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However, I wouldn't mind a logging funciton on the Hercules Super BEC, I'd like to see what the peaks are after a flight...

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08-31-2012 01:57 PM  5 years agoPost 12
floop

rrVeteran

Southern, NJ

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Be careful what BEC you run. The HV servos draw a lot of power. Perfect regulators has upgraded their HV BEC+ to handle what these servos need.

IT's what I do.

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08-31-2012 03:49 PM  5 years agoPost 13
HarveyR

rrVeteran

France - North

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The HV BEC+ specs are very similar to the WR Hercules Super BEC's ones :

HV BEC+ : 6v / 8v @ 10A/14A

Hercules Super BEC : 5.2V / 6V / 7.4V / 8.2V @ 10A/15A

Has anyone actually tried to measure what the current consumption actually is of the HV Servo setup (average and peak), even on the bench would be a good start? I don't think those small wires could get much more than 2 or 3 amps through them anyway.

From a few things I've been reading (on the Web) it seems the wires are 22 gauge and these can handle around 4 amps continuous... Seeing we have four of these the maximum continious is 16, but of course that's a maximum for the wires, and I don't no what the servos actually use during normal operation (maybe much less).

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09-04-2012 07:41 AM  5 years agoPost 14
OICU812

rrMaster

Edson, Alberta, Canada

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Ive heard the included HV servos in the new DFC kits are EXTREMELY AMP hungry, like far surpassed the DS610 or 8717s. If you are going to run the combo supplied HV servos I'd do abit more research. I am ALL ABOUT using the WR BECs, as I do on all my helis, however when new servos with no history are out I am hesitant to advising anyone till some real data is available on what they actually draw etc...

...Once upon a time there were Nitros, flybars and frequency pins...

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