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HelicopterMain Discussion › How do you and do you do Brownout bench test
06-25-2015 03:34 PM  35 months agoPost 1
wc_wickedclown (RIP)

rrProfessor

long beach calif

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How do you and do you do Brownout bench test before you maiden a new build ?

i always do ,this is the method i use,before i maiden a chopper
i've had plenty choppers brown out on the bench.

Watch at YouTube

and the G20 is ready for re-maiden

Watch at YouTube

Insha Allah made in america

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06-25-2015 04:13 PM  35 months agoPost 2
Pistol Pete

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Seffner, FL

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How do you and do you do Brownout bench test before you maiden a new build ?
I pick mine up by swash and pitch pump it as it load both the system as well as servos.

What's your set up for fail safe?

Your removable pull start is backwards.

Once you flip it,careful with angle of pull as it may rub on carb air filter and fray cord. Given low profile struts, you need to tilt heli to remove pull start.

~~Enjoying the hobby one flight at a time~~

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06-25-2015 04:21 PM  35 months agoPost 3
wc_wickedclown (RIP)

rrProfessor

long beach calif

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Your removable pull start is backwards.
Once you flip it,careful with angle of pull as it may rub on carb air filter and fray cord. Given low profile struts, you need to tilt heli to remove pull start.
gotcha thanks pete.
I pick mine up by swash
how do you do this , pick it up how with what ?
if i understand, that might crunch my fingers, but i want to understand other methods.
What's your set up for fail safe?
just bound it at low thr and the fs in the mikado program.

Insha Allah made in america

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06-25-2015 04:34 PM  35 months agoPost 4
ICUR1-2

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Ottawa, Ontario

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I use the left stick (mode 2) and move it in a circle, this way ALL the servos get worked out and electronic system.
I'll do this like a pro for about 5 mins or for nitro 10 mins.
If it fails on the bench doing this, then I know what to upgrade

I haven't had a brown out ever because of testing prior to flying

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06-25-2015 05:13 PM  35 months agoPost 5
prototype3a

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Christiansburg,VA

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I look at the data logs for BEC current and BEC voltage after stirring the sticks on my radio. Then I fly and look at the logs to see how the data compares to the bench test.

Periodically, I'll look at these logs to see if the servos are pulling more current than they did in the past to get an idea of servo motor health.

~Drew

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06-25-2015 05:41 PM  35 months agoPost 6
co_rotorhead

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Centennial, CO, USA

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I fly Futaba.

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06-25-2015 06:01 PM  35 months agoPost 7
Aaron29

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USA

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Lol here we go again!

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06-25-2015 06:26 PM  35 months agoPost 8
LaDon

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Fort Dodge .Ia

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Well hate to say it but he has a point. We switched and are flying the JR dmss on the xbus and that along with the sbus does make a difference. I do think however as far as the spektrum goes that if you ran a reciever it would solve a lot of that too. I also do not run any caps to cover the problem. All ours have been run on a 2s lipo straight to the flybarless system and let the xbus wire feed the reciever. Not saying this is the best but It does work for us

Team Jr

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06-25-2015 07:17 PM  35 months agoPost 9
wc_wickedclown (RIP)

rrProfessor

long beach calif

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co_rotorhead
I fly Futaba.
+1

Insha Allah made in america

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06-26-2015 01:00 AM  35 months agoPost 10
EEngineer

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TX

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If you're using a VBar, within the Setup...under the swash tab, "pitch pump" can be set to 100...and then "stir the sticks".

Additionally, if one has access to an O-scope, plug in an extra servo lead into an FBL port...or a thru a Y-cable if no extra ports are available.

Use the servo lead to examine how the FBL voltage is fluctuating as you stir the sticks. That's what the FBL will see.

Set the O-scope trigger to "negative edge trigger" and set the trigger level to the FBL's minimum acceptable voltage. If it triggers during a stick stir, there could be issues.

If it doesn't trigger, raise the level little by little until it does. Then you will have a quantitative measurement of how close to the FBL min voltage your setup is.

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06-26-2015 12:46 PM  35 months agoPost 11
Pistol Pete

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Seffner, FL

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WC
If it crunches your fingers, either too much pitch or stick throw. Think small push ups.

~~Enjoying the hobby one flight at a time~~

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06-26-2015 02:02 PM  35 months agoPost 12
jason46

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MI

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Bec voltage could be stepped down to find out when you're going to be in trouble and see how the system reacts. Or use a small and going dead receiver pack to accomplish this, all while putting load on the servos.

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06-26-2015 03:34 PM  35 months agoPost 13
G.Stone

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Thompson, Pa. USA

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I fly Futaba.
We switched and are flying the JR dmss
I'm currently on Spektrum koolaid, with a couple odd servo's here and there. Never had a brownout and don't test for them...knock on wood. Range test and fly, do the "touchy-feely" test on the different components when I land. I've never had a problem.

Pickin-up something called "XG14" this weekend.....hope it works

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06-26-2015 09:35 PM  35 months agoPost 14
Four Stroker

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Atlanta

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Futaba will drop out at about 2.7 volts. JR DMSS will drop out at about 3.5 volts. Not a great safety margin with 4.8 volts. But who the hell uses 4.8 volts these days. I use a 6.6 volts back on my JR DMSS. With the telemetry max and min you can check after a flight how low the instantaneous voltage goes. You will be surprised. There is typically a 1~1.2 volt drop recorded. After rewiring, I got it down to about 0.5~0.6 volts. When the min gets below 6.0 volts stop flying. If it does on a freshly charged pack, rewire the heli - heavy wire and more than one plug into RX or FBL.

Telemetry is great stuff !

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07-26-2015 10:24 PM  34 months agoPost 15
ChristianM

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Oslo, Norway

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If you're using a VBar, within the Setup...under the swash tab, "pitch pump" can be set to 100...and then "stir the sticks".
+1 on this. It will load the servos more than they will see in flight. If it does not cut out then you are good to go.

Christian

Burn fuel, be happy

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07-27-2015 12:24 AM  34 months agoPost 16
Aaron29

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USA

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I don't understand how you can say the test feature can put more load on a servo than flight loads.

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07-27-2015 02:19 AM  34 months agoPost 17
rcflyerheli

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Granbury, TX USA

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Believe me, it does. I can reliably brownout any standard Vbar just using pitch pump acceleration on the bench, even without blades attached. The brownout isn't due to a servo over power, its due to back EMF spikes that some brands of servos produce.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
Amain Team Rep

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07-27-2015 02:56 AM  34 months agoPost 18
mcfast

rrKey Veteran

Quebec Quebec Canada

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What servos are running ? if you are running Align DS610, have a look at this, interesting !

http://helifreak.com/showthread.php?t=144236

P.S. sorry for the spelling or the grammar I am dyslexic!

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07-27-2015 03:09 AM  34 months agoPost 19
rcflyerheli

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Granbury, TX USA

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The servos that I had issues with were the BK HV servos (7001 and 8001). They would brownout all my Vbars using 70c 2200mah TP 2s packs.

On my older blueline full sized Vbars, only one servo could cause the system to shut down. Adding capacitors didn't solve the issue, only going to a WR Hercules super BEC pro worked.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
Amain Team Rep

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07-27-2015 05:57 AM  34 months agoPost 20
rcflyerheli

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Granbury, TX USA

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I am setting up a new Vplane using 4 610 servos. After reading the above, I went back to the shop and tried a test on the Vbar/Vplane using 4 610s, and could not get it to give me either a low voltage message in the log or brownout.

This was off a Hacker Pro 70a ESC off 6s and running whatever BEC that comes on it. This was of course outside the plane with no load on the servos.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
Amain Team Rep

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HelicopterMain Discussion › How do you and do you do Brownout bench test
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