RunRyder RC
 9  Topic Subscribe
WATCH  12 pages [ <<    <     6      7     ( 8 )     9      10     NEXT    >> ] 2565 views POST REPLY
Hitec RCD ProModeler
HelicopterMain Discussion › Reducing the internal resistance of LiPos
heliraptor10

Key Veteran

kokomo, in-US

My Posts: All  Forum  Topic

I've also been reading various sources that seem to say that this reaction is to be expected, but due to the coil "tricking" the cell pro. That the reduced resistance is basically just perceived. That combined with heating from inductance would lead to the appearance of severely reduced internal resistance.

However,
I've seen this reduced resistance still present days later. Charging normally and the ir is still lower.

I hope to show that if I can get in a couple big days flying.

I have nothing to gain by lying to you,
My worst case scenario is that I'm fundamentally misunderstanding something.

I am presenting the numbers I'm seeing.
And not hand picking the results I want.

Goblin! where have you been all my life?

04-20-2017 09:18 PM
PM  EMAIL  GALLERY  Attn:RR
heliraptor10

Key Veteran

kokomo, in-US

My Posts: All  Forum  Topic

We

I don't know,
The internet?
The people in my head?

Do you have a DSMV ?
Nope just a DVM

Don't pretend like you don't condescend to pretty much every member on here. It's fine, and funny, but your whole purpose in commenting here was to shut me down with your beliefs.

You can say that it can't be doing that, it shouldn't be doing that, but if you're going to do that then the size of my coil is irrelevant,
How thick my sheath is doesn't matter (pervert) because I am wrong in principal.
And you must believe I am wrong in principal because you have no interest.

So since you aren't helping in any way shape or form, logic dictates you are amusing yourself.

I sometimes wonder if you ever fly at all,
The snark must keep you busy.

Goblin! where have you been all my life?

04-20-2017 09:30 PM
PM  EMAIL  GALLERY  Attn:RR
EEngineer

Elite Veteran

TX

My Posts: All  Forum  Topic

"the coil "tricking" the cell pro"

The coil doesn't "trick" anything....it's the way you hooked it up.

Try separating the coil's power from the power to the cell-pro....and use a 3 ohm, 50 watt power resistor in series with the coil.

Then the coil will have 4A....and the cell-pro won't know the coil's present. The cell pro's power input will be 4A less.

The only expense involved is that of the 3 ohm, 50 watt resistor.

Is $5 too much?

Here's a link for the resistor:

http://www.mouser.com/Passive-Compo...CFcolgQodb40IRw

In stock....

3.3 ohm = 3.6A coil current.

Logo 600SXs, 700XX, 800XX

04-20-2017 09:34 PM
PM  EMAIL  Attn:RR
heliraptor10

Key Veteran

kokomo, in-US

My Posts: All  Forum  Topic

Now you want be to buy something that increases the nothing that is happening?

I can power the coil separately but that won't change anything.

you can literally do this with a speaker magnet

Swipe the magnet across (like magnetizing a needle) a battery while measuring IR and you can see the IR drop as you go.

Or do it and post a video proving me wrong.

I will be getting 2 identical lipos for some video tests of my own.

Goblin! where have you been all my life?

04-20-2017 09:57 PM
PM  EMAIL  GALLERY  Attn:RR
EEngineer

Elite Veteran

TX

My Posts: All  Forum  Topic

"I can power the coil separately but that won't change anything."

How do you know?

Logo 600SXs, 700XX, 800XX

04-20-2017 09:59 PM
PM  EMAIL  Attn:RR
heliraptor10

Key Veteran

kokomo, in-US

My Posts: All  Forum  Topic

There is a feature of lipos many aren't aware of. Digital devices screw them up.

The frequency of draw causes what has been At times unpredictable.

I don't think it's all that absurd to suggest that a coherent emf source can re align what gets knocked out by digital draw (which I'm guessing our ESCs get around this with caps)
And high strength EMF from the motor.

Goblin! where have you been all my life?

04-20-2017 10:05 PM
PM  EMAIL  GALLERY  Attn:RR
heliraptor10

Key Veteran

kokomo, in-US

My Posts: All  Forum  Topic

Because
you can literally do this with a speaker magnet

Goblin! where have you been all my life?

04-20-2017 10:07 PM
PM  EMAIL  GALLERY  Attn:RR
EEngineer

Elite Veteran

TX

My Posts: All  Forum  Topic

"There is a feature of lipos many aren't aware of. Digital devices screw them up."

Really?

Is that limited to just "digital" devices?

Logo 600SXs, 700XX, 800XX

04-20-2017 10:09 PM
PM  EMAIL  Attn:RR
AirWolfRC

rrProfessor

42½ N, 83½ W

My Posts: All  Forum  Topic

I'm here because I'm hoping that you will give a credible set of details on your trials and not just post a few half baked measurements and think that others are going to tidy up your missing data.

As it stands, temperature measurements rather than magnetics is more likely to be at the root of the incomplete empirical results you have posted so far.

04-20-2017 10:17 PM
PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR
heliraptor10

Key Veteran

kokomo, in-US

My Posts: All  Forum  Topic

We get it ee
You know it all.

And don't ask me we who.

Some of us didn't know that amps and volts aren't the only thing to consider with lipos.
certain cycling or Hz in the draw will cause adverse behavior and even failure in a lipo battery,
All while drawing normally rated volts and amps.

I wonder if this couldn't be related to emf phasing traveling through the battery,
Where the electro magnetic field changes are creating waves of resistance.

Goblin! where have you been all my life?

04-20-2017 10:19 PM
PM  EMAIL  GALLERY  Attn:RR
heliraptor10

Key Veteran

kokomo, in-US

My Posts: All  Forum  Topic

I plan on including temps.
And I'm considering doing a written log.

And I'm trying real hard to remember finite math.

But I'm not measuring the sheath.

Goblin! where have you been all my life?

04-20-2017 10:23 PM
PM  EMAIL  GALLERY  Attn:RR
EEngineer

Elite Veteran

TX

My Posts: All  Forum  Topic

"And don't ask me we who."

Who is "we"?....

How can a LiPo tell whether a digital device is connected to it?

Just asking....

Logo 600SXs, 700XX, 800XX

04-20-2017 10:28 PM
PM  EMAIL  Attn:RR
heliraptor10

Key Veteran

kokomo, in-US

My Posts: All  Forum  Topic

http://batteryuniversity.com/learn/...he_digital_load

Goblin! where have you been all my life?

04-20-2017 10:53 PM
PM  EMAIL  GALLERY  Attn:RR
AirWolfRC

rrProfessor

42½ N, 83½ W

My Posts: All  Forum  Topic

That article fails to tel the reality of it all.
Yes, digital loads draw high current - - but only for a very short time.
Then the article goes on to show what a high (3C) discharge will do to output voltage - - but notice that the graphs show the high discharge as a steady state discharge (which normal analog testing will show).

If the digital devices have enough input capacitance, the spiking digital loads are not a problem.

Them the only thing left to look at is the load from digital servos
- - but they have a pretty wide input range anyway.

04-20-2017 11:05 PM
PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR
EEngineer

Elite Veteran

TX

My Posts: All  Forum  Topic

Here's the disclaimer for the link you posted:

"Disclaimer

While every effort was made to ensure that the information contained in this publication is accurate, Cadex does not warrant or guarantee the accuracy and completeness of the information published herein; neither does Cadex take responsibility for any errors, omission or damages arising from this information. The graphs and tables included are for illustration of typical battery applications and are not intended as constructional information to solve engineering issues."

Logo 600SXs, 700XX, 800XX

04-20-2017 11:12 PM
PM  EMAIL  Attn:RR
heliraptor10

Key Veteran

kokomo, in-US

My Posts: All  Forum  Topic

http://batteryuniversity.com/learn/...rnal_resistance

Goblin! where have you been all my life?

04-20-2017 11:20 PM
PM  EMAIL  GALLERY  Attn:RR
heliraptor10

Key Veteran

kokomo, in-US

My Posts: All  Forum  Topic

Ok and there's a disclaimer on NASA and weather websites saying data is only to be used for research and entertainment.
That the data isn't accurate enough for that.

Standard don't try this at home we don't stand by our own observations crap.

Goblin! where have you been all my life?

04-20-2017 11:22 PM
PM  EMAIL  GALLERY  Attn:RR
EEngineer

Elite Veteran

TX

My Posts: All  Forum  Topic

What's your point with that?

Logo 600SXs, 700XX, 800XX

04-20-2017 11:36 PM
PM  EMAIL  Attn:RR
heliraptor10

Key Veteran

kokomo, in-US

My Posts: All  Forum  Topic

I could ask you the same thing
Pointing out a common feature shared by websites careful about sharing info,
Doesn't mean the info is valueless.

Goblin! where have you been all my life?

04-20-2017 11:44 PM
PM  EMAIL  GALLERY  Attn:RR
heliraptor10

Key Veteran

kokomo, in-US

My Posts: All  Forum  Topic

Hey wait

I thought I won

Why are you still picking at everything?

Goblin! where have you been all my life?

04-20-2017 11:49 PM
PM  EMAIL  GALLERY  Attn:RR
WATCH  12 pages [ <<    <     6      7     ( 8 )     9      10     NEXT    >> ] 2565 views POST REPLY
Scorpion Power GLOBAL 3D
HelicopterMain Discussion › Reducing the internal resistance of LiPos
 Print TOPIC Advertisers 

 9  Topic Subscribe

Monday, May 1 - 1:24 am - Copyright © 2000-2017 RunRyder   EMAILEnable Cookies

Login Here
 New Subscriptions 
 Buddies Online