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Revolution Models . CarbonXtreme . Midland Helicopters

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e-Century Hummingbird - Swift > Swift electrics question
 
 
westcoastchoper
Senior Heliman
Location: Denton, Tx

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I was planning on asking this in the motor/esc area but it doesn't seem like there is as much activity there.

I have had my swift for a while now and it has been flying great. It has been way too hot the last week or so (105) buy yesterday it was quite nice...upper 80's. I flew 1 pack...8 mins...everything perfect. Next battery...5 mins in the motor shuts off. I think "great, I get to practice an auto". It was half a second later I realize I have nothing. No servos, no motor...nothing. Luckily I had a little altitude and was basically at a hover...it was coming down easy and just floating to the right a little. 10 feet off thr ground pow...it comes back to life. I immediately land it and inspect. Esc was warm but normal. Same with battery. Deans was quite hot. Motor was cool.
WHAT THE HECK HAPPENED!!!

Here is my setup for electrics...
Century 600a 1100 kv
Century 80/100 esc
Century BEC
Futaba servos 401 gyro
Spektrum dx7/AR7000
6s lipo

I am ruling out a failsafe lockout due to the fact that I have not set that up as of yet and default would have given me full neg pitch. Everything simply froze in place like the bec stopped giving voltage to the RX. I am tempted to put a 4 cell rx pack with a switch on board to help rule out the bec but if I am wrong it might cost me my heli....But the bec or bad deans connector is all I can think of.
What else could have caused this???
07-08-2009 11:44 PM
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Ben-T-Spindle
rrProfessor
Location: Central Illinois

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If the connectors get hot than they should be replaced. Nothing should get hot. A hot spot always indicated a problem.

Heat is an indication of a high resistance spot. It could be a bad solder joint, bad wire, or a defective connector.



... BTS
07-09-2009 12:24 AM
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Heli 770
rrProfessor
Location: Lemon Grove, Ca. USA.

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Check the soldering job on the connectors, sounds like a lot of resistance there.
07-09-2009 12:26 AM
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westcoastchoper
Senior Heliman
Location: Denton, Tx

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I have 3 6s batteries that I use. A zippy, flight power and a Kong. The zippy and Kong both have large wires while the fp has very small wires. When I fly the zippy and kong the deans stays very cool while the FP the deans gets warm as well as the wires on the battery. I was flying the flight power. I will check the deans. I have been considering changing over to bullets anyway.
07-09-2009 01:56 AM
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Ben-T-Spindle
rrProfessor
Location: Central Illinois

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I converted to 4mm bullet on all my medium and large helicopters several years ago. I just don’t trust dean’s for high current.

I use Great Planes 4mm connectors from Tower Hobbies. They are better than most other brands of that size. They are about the only ones that easily fit the large 10g wire that CC puts on their large ESC’s.



... BTS
07-09-2009 10:46 AM
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Pistol_Pete
Elite Veteran
Location: Tampa Bay non-Buccaneer

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Quote 
I am ruling out a failsafe lockout due to the fact that I have not set that up as of yet and default would have given me full neg pitch.

first red flag?


Quote 
Everything simply froze in place like the bec stopped giving voltage to the RX.

what are the ESC settings?


Quote 
I am tempted to put a 4 cell rx pack with a switch on board to help rule out the bec but if I am wrong it might cost me my heli

A well designed ESC will not disable the BEC after shutting down the motor, which would have been the primary suspect BUT considering you had no control of servos as well starts pointing to the RX instead.

I would test on ground with same battery prior to taking flight or very close to ground.

FWIW...I use a 4.8 NiMH as I do not use an UBEC or the CC P-80 built in BEC, giving me some peace of mind.

Quote 
But the bec or bad deans connector is all I can think of.

As mentioned, check the soldering and wiggle/pull wire to make sure they are well connected. If not mistaken DEANS are rated @ 40A continuous. I have pushed them much higher with no issues.

Quote 
What else could have caused this???

Im not familiar with the Century ESC line. Dont know what can be programmed at all.

Reading between the lines indicates you where doing more hovering than flying around which in takes more power and motor has less air to cool it as well. Not that this has anything to do with your issues but just mentioned it for the hallibut.

<><>...the lunatic is in my head...<><>
07-09-2009 04:12 PM
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imnxtc
Veteran
Location: Dawson

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Quote 
I am ruling out a failsafe lockout due to the fact that I have not set that up as of yet and default would have given me full neg pitch.

Well I would not rule out the failsafe possibility, because that is exactly what the default is programed to do on most radios. It tells the throttle servo to go to idle (in the case of electric, to shut down) and for all others (including collective) to remain at the last known position.

Many radios now have a low-voltage warning that uses this failsafe to let you know the power supply to the RX is getting low. It does exactly what you described. But to allow the pilot to immediately fly back to the field and land, all one has to do is bring the throttle stick back all the way, and all will engage again for a 1/2 minute or so, which is usually enough time to get it back and to land it.

I always use a seperate RX battery. I have had a solder connection on the main battery come off, so the motor quit in the air. Because of running a seperate battery, I still had full radio control, so I was able to make a successful auto with no damage. I am sure there are a number of other scenerios where it is also advantageous.

Initially I had used a seperate battery simply because the Swift can easily be a bit tail heavy and can easily carry the extra weight. As I like using useful weight, I just went to a seperate battery up front. After that incedent, I have converted all my bigger electric helis to seperate packs.
07-09-2009 05:35 PM
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laughingstill
Elite Veteran
Location: Gainesville, Fl, USA

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Not a failsafe

Quote 
It was half a second later I realize I have nothing. No servos, no motor...nothing
He would still have cyclics if it were. Check the battery connections as well as the solder joints........Ron

Esprit Model Flight Team, Logo 600 VBAR Xera 4030, Logo 500 Mini-VBAR Xera 4020, 3DMP-E VBAR soon!
07-09-2009 05:44 PM
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imnxtc
Veteran
Location: Dawson

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Why I said it was possibly a "low-voltage" failsafe issue, is because it would have locked out ALL controls at the last setting, and throttled back (like the motor died and no servo control)....until he brought the throttle stick down to the radios preset thresh-hold.

Once he did that, he would "miraculously" regain all control as he describes.
07-10-2009 01:17 AM
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laughingstill
Elite Veteran
Location: Gainesville, Fl, USA

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Every ESC I have ever owned will only cut the motor and not the cyclics (although I am sure there are some that cut it all.....but why :confused. Also the connectors were hot....that is resistance and that will lead to failure every time...........Ron

Esprit Model Flight Team, Logo 600 VBAR Xera 4030, Logo 500 Mini-VBAR Xera 4020, 3DMP-E VBAR soon!
07-10-2009 03:15 AM
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westcoastchoper
Senior Heliman
Location: Denton, Tx

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Now when I plug in the battery (any battery) the remote rx light flashes slowly. Manual states that is a low voltage incidence issue.
In the past, every once in a while, when I plug the battery in it will give an abnormally large arc/pop and the esc will not arm/activate. The cyclic servos will work but gyro/tail servo will be dead. I simply unplug and re-plug quickly and then everything is fine. I am assuming the instant load is due to the resistance of the BEC. Is this correct? My 450 electric does not pop like that but it is half the voltage...
07-10-2009 03:52 AM
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HeliProz . Ron’s HeliProz South . MTA Hobbies

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e-Century Hummingbird - Swift > Swift electrics question
 
 
laughingstill
Elite Veteran
Location: Gainesville, Fl, USA

My Posts This: Topic  Forum
The pop is normal for larger batteries. Is the tx on when you power up the electronics? If you leave the tx on and unplug/reconnect the main battery, the rx "thinks" you had a power cut out and will flash slowly. Turn the tx AND the rx off, turn the tx back on and then reconnect the electronics. The rx light should be on solid and everything should power up..........ron

Esprit Model Flight Team, Logo 600 VBAR Xera 4030, Logo 500 Mini-VBAR Xera 4020, 3DMP-E VBAR soon!
07-10-2009 03:56 AM
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Revolution Models . CarbonXtreme . Midland Helicopters

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e-Century Hummingbird - Swift > Swift electrics question
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