Sluggish Servo Movement

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Re: Sluggish Servo Movement

PostPosted: Wed Sep 26, 2012 8:22 am

One nice thing about the FMA Cellpro charger is you only have to plug in the balance plug. With some of my other chargers, you have to plug the main power lead and the balance plug to the charger. I do a balance charge every time.
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Re: Sluggish Servo Movement

PostPosted: Wed Sep 26, 2012 11:33 am

QUICK QUESTION.......... What's wrong with good old Nicads?

I can't remember a failure in many years, I own about a dozen different style chargers that charge and dis-charge......Why not stick with Nicads??? :dk:
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Re: Sluggish Servo Movement

PostPosted: Wed Sep 26, 2012 11:44 am

Nicads are bulletproof and can handle overcharging better than any other battery type..

With that comes a price - they are also the heaviest!!!
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Re: Sluggish Servo Movement

PostPosted: Wed Sep 26, 2012 11:51 am

They also develop a memory over time. The largest reason to go to a123 is the discharge curve. A123 holds voltage till just before they are dead. Nicad loses voltage at a steady rate so your servos get progressively slower as they discharge.
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Re: Sluggish Servo Movement

PostPosted: Wed Sep 26, 2012 1:06 pm

Not exactly true. As a matter of fact nicads and NiMH have a flatter discharge curve than Li.

http://www.mpoweruk.com/performance.htm
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Re: Sluggish Servo Movement

PostPosted: Wed Sep 26, 2012 1:15 pm

Sorry guys, but you still have not convinced me! Nicads are heavier, true....but we're only talking grams...not really enough to warrant a re-purchase of a power source, and chargers.

The memory development issue, is a non issue, if you are aware of it, and cycle the packs every so often. I have also become very comfortable, with a battery telling me it's getting worn out, like Nut mentioned

Don't get me wrong, I'm NOT trying to start a Coke/Pepsi debate here...........I just want some of our resident battery experts to give me some reason, something ....that would motivate me to run out and buy the new technology!! :tu:
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Re: Sluggish Servo Movement

PostPosted: Wed Sep 26, 2012 1:37 pm

A123's also hold voltrage for ever. NiMH and Nicad will self discharge much faster. I also like the boost in voltage 6.6V makes a pretty big difference in overall servo performance. Not to mention being ready to fly in about 15-30 minutes. But in the end Its all a prefrence thing

on a side not, chances are most people have atleast one E bird, so they probably have a charger. Many chargers can be made to charge liFe or a123 if you mess with the settings. There is usually an option for "end voltage" or something along those lines hidden somewhere in the menu
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Re: Sluggish Servo Movement

PostPosted: Wed Sep 26, 2012 1:48 pm

Maniac, I am just like you with not wanting change - as long as the system I have is working fine. I had NIMH for years and years with no problems. I had 3 Ace Digipulse chargers that always had my planes charged and trickle charged ready to go. Then I had about 4 NIMH's that needed replacement - and at about $25 each it was a no brainer to switch to WW A123 because Richards combo deal had his price on the 1100's about the same as the NIMH, and the A123 were lighter.

Well, I got the combo deal and couldn't be happier - and now wish I would have switched to WW A123 much sooner. There is so many reasons.. One of the nicest thing is that I don't have to store my planes all together within reach of the Digipulse. Since they are not on trickle, I can put them anywhere. I don't have to worry about plugging them in right after flying. I feel there is much more power with the A123. No memory loss as the other have stated. SUPER FAST CHARGING!! Top off at the beginning or end of the day in 10 or 15 minutes and you are ready for a full day of worry free flying.
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Re: Sluggish Servo Movement

PostPosted: Wed Sep 26, 2012 2:04 pm

kingmeow wrote:Not exactly true. As a matter of fact nicads and NiMH have a flatter discharge curve than Li.

http://www.mpoweruk.com/performance.htm

We are not talking about li ion we are talking about li Fe. lithium ion is still not as flat of a curve as lithium fosphate. the battery will hold it's nominal voltage of 6.6 until the last 10% or so of the charge and then dump so hard the graph would look like a wall.
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Re: Sluggish Servo Movement

PostPosted: Wed Sep 26, 2012 8:00 pm

I switched to A123 and LiFe batteries when Spektrum was having brown out problems. These batteries hold there voltage under load which kept the Spektrum receiver from having a brown out and reboot problem.
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Re: Sluggish Servo Movement

PostPosted: Thu Sep 27, 2012 11:22 am

darylm wrote:I switched to A123 and LiFe batteries when Spektrum was having brown out problems. These batteries hold there voltage under load which kept the Spektrum receiver from having a brown out and reboot problem.


Cured that brown out problem with a capacitor...have had no problems with them, but looking into the A123's
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Re: Sluggish Servo Movement

PostPosted: Thu Sep 27, 2012 11:23 am

Well got to the bottom of it…it wasn’t batteries or fried servos. It was gummy servos. The two most affected were the tail feathers on the dirty side. Fut 3305 metal gears. Upon opening them up I, immediately saw the goo seepage. Cleaned everything up with alcohol, applied lithium grease to the gears and a drop of machine oil to the bearings and bam good as new. Still going to look into those A123 bats though.
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Re: Sluggish Servo Movement

PostPosted: Thu Sep 27, 2012 11:26 am

Glad you got it sorted. You will love the a123 batts. I have em in every bird I own.
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Re: Sluggish Servo Movement

PostPosted: Thu Sep 27, 2012 11:37 am

Thanks for the update. Glad you got it sorted out.
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Re: Sluggish Servo Movement

PostPosted: Thu Sep 27, 2012 12:06 pm

In the back of my mind I was thinking sludged pots too....

I remember a buddy having to de sludge servo's in his combat fleet every spring, he'd get a hand full that were slow.

Since you had question of your battery being junk, best to start off with a good battery and diagnose from there.

Good point from Daryl M about A123 pushing Voltage under load. Thats where the A123's really shine and will make crappy servos look good and good servos look like rock stars!
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