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HomeAircraftHelicopterFlybarless Rotor Head SystemsOther › Align 3g amp draw!
02-01-2010 08:45 AM  8 years agoPost 1
Darkplague

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Adelaide, South Australia

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Here is a link I have pasted which some of you may find interesting.

It is from my local forums in Australia. One guy was having trouble with his servos failing on 8v with the 3g, which resulted in the 3g being tested for Amp draw among other things with a logger.

The results of the data may surprise some people.
Anyway give it a read, if your thinking about using 8v servos.

http://www.archeli.com.au/forums/sh...ad.php?t=131857

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02-01-2010 02:31 PM  8 years agoPost 2
george0079

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USA

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Very interestong

Hell... I can fix that.
Uh oh..
Nope.
It's ***ked!!!
RE-KIT!!!!!

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02-01-2010 03:09 PM  8 years agoPost 3
psych-lick

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Portland, OR

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Thanks for sharing.
(Skip to page 14)

-Jeff T.

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02-01-2010 03:33 PM  8 years agoPost 4
Darkplague

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Adelaide, South Australia

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Seems to be a very power hungry unit the 3g

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02-01-2010 04:15 PM  8 years agoPost 5
duke666

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Hampshire, UK

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Very interesting and very thorough R & D.

For those that don't want to read all the posts here's the interesting bit:

http://www.archeli.com.au/forums/sh...=131857&page=14

And here's the conclusion:
Whoa... Average current is up at 3.2 Amps and hit a peak current of 6.3 Amps.

If we divide the figures by 2 to get the approximate current draw of each servo, then multiply this figure by 3 to extrapolate out for 3 servos [as I could only test with 2 at this time], we can calculate an average current of 4.8 Amps and a peak of 9.45 Amps for 3 servos...!!!

Remember that the servos are not even mechanically loaded...!!

Another thing I noticed was that the servos were warm after being tested for only 1 minute with a supply voltage of 6v. On the 2S setup, they were uncomfortably hot for my liking after only 1 minute.

Temp was probably in excess of 50C on the metal case so internal temps would be a lot higher.

IMO 8v voltage is too stressful for these servos when run with the FBL combination.

BTW - The FBL unit has performed fine during all the tests.

OOOPPS............

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02-02-2010 12:39 AM  8 years agoPost 6
Shawn Behrens

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DEEP IN THE BOG

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Wow if this information is correct I forsee alot of issues ahead. Such as lotsa servo, regulator, and receiver failures if these tests ring true.

shawn

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02-02-2010 01:04 AM  8 years agoPost 7
panzlflyer

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Goldsboro,NC,USA

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Skookum draws a lot as well.
Ditch the regs and go A123 unregulated!!!

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02-02-2010 12:51 PM  8 years agoPost 8
bladebraker

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USA

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I lost 2 servos now I know why I have a AR7100 RX so lets see cant use my RX $150 burned 2 8717s $350 have to buy a new RX $150 G3 $445 so that comes to $1095.00 I sould have got a bought a V-Bar and put the xtra $620 in my bank O well live and learn

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02-02-2010 01:07 PM  8 years agoPost 9
flyboy907

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woodstock, ga

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Yeah I use life po packs which are 6.6v same as a123 unregulated and in three flights only put back 968mah

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02-02-2010 01:21 PM  8 years agoPost 10
bladebraker

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USA

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so I could use my RX with that pack? Man I gun shy I think I will just put my gyro and flybar back on. I cant aford to keep burning $175 servos thanks though!!

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02-02-2010 01:30 PM  8 years agoPost 11
flyboy907

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woodstock, ga

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yeah you can ,really not a big deal.

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02-02-2010 02:35 PM  8 years agoPost 12
bladebraker

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USA

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LOL

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02-02-2010 06:02 PM  8 years agoPost 13
panzlflyer

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Goldsboro,NC,USA

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When i was flying Giant scale planks with a possible 10+ amps draw I went round and round with data loggers, regulators etc and found that a 2 cell LiFe or A123 could handle it with ease.
No more voltage than a 5cell nicad, starts at 7.2v but drops to 6.6v or thereabouts quickly.
No loss of performance.
Keeps it simple as well.

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02-03-2010 08:10 AM  8 years agoPost 14
Terrabit

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Seattle, WA - USA

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Hi guys! I'm using 2s Hyperion LiFe 2100's in my T700 unregulated through an AR7100R with Align DS610's and G3 FBL. These batteries are rated at 5c. 2.1Ah * 5c = 10.5amps continuous. I flew my first 4 gentle flights on this setup today and only put back about 600mAh at recharge. I'm thinking I could get three moderate flights through each without issue.

This should be fine, right?

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02-03-2010 01:27 PM  8 years agoPost 15
panzlflyer

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Goldsboro,NC,USA

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I would run it a few more times charging after each go to get a good baseline consumption before you push it.

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02-03-2010 03:35 PM  8 years agoPost 16
Terrabit

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Seattle, WA - USA

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That's the plan. What I am uncertain of is how the max available amps is reduced through the discharge cycle. For example, would I still have 10 amps available at 60% discharge?

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02-03-2010 09:41 PM  8 years agoPost 17
Elgreco

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Montreal,QC-Canada

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Quick question...
Is the problem as I understand it then the regulator ? Meaning it limits the available power output ?

Running the lipo straight would then be better ?
I am running spektrum 7 and 9 ch but not the 7100r using lipo 2s battery (outrage).
I would have to upgrade my RX to run straight from the lipo ?

Thanks in advance...

Trex 550 V-BAR, Trex 700 V-BAR, N5-os55VBAR, TREX700E V-BAR /X9503

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02-03-2010 09:55 PM  8 years agoPost 18
USNAviationjay

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Houston Tx USA

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I think this very issue may be whats wrong with mine.

think the 2in1 is strangling it for power.

going to try straight 6.6 LifePo before I RMA it.

has to be either power related or defective unit.

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02-03-2010 11:48 PM  8 years agoPost 19
panzlflyer

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Goldsboro,NC,USA

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Terrabit,
Under my testing at 10amps the LiFE A123s drop voltage and then continue in a near dead straight line to the very end where it drops like a rock.
The problem with that is that you do not know via a voltage/amp check how much is in reserve so I try and be conservative, know how much you use per flight and have a large safety margin, as they can be charged at 10amps its only going to take a few minutes to be back fully charged.
The problem with a lot regulators is that they are inefficient and if pushed hard will switch off, plus they come with puny wiring.
My experience with GS 40%and 35% was that the consumption was really low, 200-300 mah for ten minutes with 8-10 digital servos but the amp drw in burst was 10+amps (thats when you get brownouts).
The amp rating on some of these regs is very questionable try loading it up and you may get a nasty suprise.
3 8717s working hard are going to suck some juice!!!

If I was going to use a regulator I would get and inline meter and push my servos hard on the bench and check my voltage under load, plus see how hot the reg is getting.
All the guys I know who bought into the LiFe 6v setup with no regs all seem to think their control response is actually faster ( dont know if its in their head or not!)
My 2 cents
Just my 2 cents.

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02-04-2010 07:19 AM  8 years agoPost 20
Terrabit

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Seattle, WA - USA

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Hey thanks! I'm using 2s Hyperion LiFe 2100mAh RX packs directly into the AR7100R - no reg. So it's 14 guage wire running end to end. No problems there.

I was stunned to see that I am using less than 300mAh per flight. That doesn't seem right to me. What do you think? 300mAh per 8 minute flight on a flybarless 90? I'd expect it to be more like 500mAh.

I'll watch it closely.

Thanks again!

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