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Search: Posts Made By: dereckbc
Forum: General Electric Discussions Today, 05:21 PM
Replies: 4
Views: 113
Posted By dereckbc
AMA is a Non Profit Organization. That in no way...

AMA is a Non Profit Organization. That in no way means it cannot make a profit, it just means any profit goes into its programs like hiring lawyers and lobbyist to go to Washington to protect our...
Forum: General Electric Discussions Yesterday, 08:35 PM
Replies: 4
Views: 113
Posted By dereckbc
It Is Time

First I am not an officer/agent/rep of the AMA or any RC Club. I am just a member of AMA and my local club who loves and supports the hobby.

If is time to renew your AMA membership, and it is even...
Forum: Humor 12-17-2014, 08:51 PM
Replies: 7
Views: 199
Posted By dereckbc
Do they have young daughters?

Do they have young daughters?
Forum: Batteries & Chargers 12-14-2014, 10:02 PM
Replies: 65
Views: 759
Posted By dereckbc
I am new to RC, only about 2 years, but have had...

I am new to RC, only about 2 years, but have had a Brown Out accident in my Apprentice S. Not pretty. But what I have concluded at least for my situation and plane the manufacturer installed to light...
Forum: Batteries & Chargers 12-14-2014, 05:34 PM
Replies: 65
Views: 759
Posted By dereckbc
Nigel the thread is offered as informational...

Nigel the thread is offered as informational because Ri affects many operational characteristics. If someone wants to log it fine, if not fine. It can be as simple writing the base reference on the...
Forum: Batteries & Chargers 12-13-2014, 04:57 PM
Replies: 65
Views: 759
Posted By dereckbc
Yes. I was responding to using the ESC/motor for...

Yes. I was responding to using the ESC/motor for the load. Packs are series configured and like a chain the weakest link in the chain is the cell with the highest Ri.
Forum: General Electric Discussions 12-13-2014, 04:53 AM
Replies: 40
Views: 592
Posted By dereckbc
No problem here cheer up.

No problem here cheer up.
Forum: Batteries & Chargers 12-12-2014, 10:05 PM
Replies: 65
Views: 759
Posted By dereckbc
I know, I was just poking fun at you. Relax. Its...

I know, I was just poking fun at you. Relax. Its all good. :D

FWIW I really like military oriented museums, especially those devoted to WW-II aircraft and Battleships. I am a WW-II history buff....
Forum: General Electric Discussions 12-12-2014, 10:02 PM
Replies: 40
Views: 592
Posted By dereckbc
No, do you have a guilty conscious? I was...

No, do you have a guilty conscious? I was speaking to the OP.
Forum: General Electric Discussions 12-12-2014, 09:36 PM
Replies: 40
Views: 592
Posted By dereckbc
Are club rules help prevent that from happening....

Are club rules help prevent that from happening. First a Race Track pattern must be observed. Slower planes fly low, fast planes fly high. No more than 4 planes in the air at once. Only exception is...
Forum: Batteries & Chargers 12-12-2014, 09:27 PM
Replies: 65
Views: 759
Posted By dereckbc
When was the last time you heard a dead man say "...

When was the last time you heard a dead man say " I almost survived being shot to death" :eek:
Forum: Batteries & Chargers 12-12-2014, 08:14 PM
Replies: 65
Views: 759
Posted By dereckbc
Well if you know anything about military...

Well if you know anything about military explosives or demolition like armor piercing ordnance or steel beam cutters they use copper disc in shaped charges to cut through steal like a hot knife...
Forum: Batteries & Chargers 12-12-2014, 07:50 PM
Replies: 65
Views: 759
Posted By dereckbc
Yeah but it was fun. No wife, no kids, no money,...

Yeah but it was fun. No wife, no kids, no money, no worries. Not retired yet, still working but not for much longer. At least I got rid of the kids and made them someone else problem. Anyone need a...
Forum: Batteries & Chargers 12-12-2014, 07:42 PM
Replies: 65
Views: 759
Posted By dereckbc
Did the same thing in my youth years except I...

Did the same thing in my youth years except I used car headlights which was strictly for 12 volt battery systems when I was into Ham radios.
Forum: Batteries & Chargers 12-12-2014, 07:35 PM
Replies: 65
Views: 759
Posted By dereckbc
This is laughable when you know a 12 AWG copper...

This is laughable when you know a 12 AWG copper wire fusing current is 235 amps.

For those that do not know what Fusing Current means, it means the current at which point the wire melts and turns...
Forum: Batteries & Chargers 12-12-2014, 07:11 PM
Replies: 65
Views: 759
Posted By dereckbc
Well I should have qualified that statement on a...

Well I should have qualified that statement on a well rested battery to bleed off any surface charge. A quick shot of a load will do that. But either way works. Only thing I can add, is the more or...
Forum: Batteries & Chargers 12-12-2014, 06:16 PM
Replies: 65
Views: 759
Posted By dereckbc
Thanks for the link. It supports and validates...

Thanks for the link. It supports and validates everthing I have said. I am one of those Electrical Engineers. :D

Only trouble I have with the article is it does not take any special test...
Forum: Batteries & Chargers 12-12-2014, 04:37 PM
Replies: 65
Views: 759
Posted By dereckbc
Not so fast there Nigel. Please tell us the...

Not so fast there Nigel. Please tell us the protocol to define a 20C pack?

Sorry, it is a trick question because I know you cannot answer. There is no test or measurement you do to find out. If...
Forum: Batteries & Chargers 12-12-2014, 04:15 PM
Replies: 65
Views: 759
Posted By dereckbc
Some do publish Ri but the problem is there is no...

Some do publish Ri but the problem is there is no standard or definition or test protocol of "C" Rate. No way you can test or measure it. If there is I have never found one and have asked some...
Forum: Batteries & Chargers 12-12-2014, 05:29 AM
Replies: 65
Views: 759
Posted By dereckbc
That is not good. You smaller 800 mah with 20C...

That is not good. You smaller 800 mah with 20C will perform better than your 40C larger packs. That was one of the points I was referring to to find out the manufactures who fudge numbers. You are...
Forum: Batteries & Chargers 12-12-2014, 05:22 AM
Replies: 65
Views: 759
Posted By dereckbc
I cannot give you a number because quality...

I cannot give you a number because quality between manufactures varies greatly, but based on experience and some research about twice the number of cycles assuming you use it enough before the clock...
Forum: Batteries & Chargers 12-12-2014, 05:03 AM
Replies: 65
Views: 759
Posted By dereckbc
Just making a point what RC uses is not what is...

Just making a point what RC uses is not what is normally called a LiPo, it is a Hybrid LiPo which uses a Gel or Wet electrolyte which significantly reduces Ri so we can draw the very high C-Rate. The...
Forum: Batteries & Chargers 12-12-2014, 01:40 AM
Replies: 65
Views: 759
Posted By dereckbc
Well like we discussed on the other thread that...

Well like we discussed on the other thread that is comparing Apples to Oranges. A123 is a LFP battery and we are talking LiPo. Nothing last as long as LFP in the lithium battery line up. LiPo is has...
Forum: Batteries & Chargers 12-12-2014, 01:35 AM
Replies: 65
Views: 759
Posted By dereckbc
Talking Well like I said it is not for everyone. So for...

Well like I said it is not for everyone. So for you not much to discuss.

However many want to know more about it, and this thread is for them. Many RC hobbyist are not Electrically inclined. I am...
Forum: Batteries & Chargers 12-12-2014, 01:18 AM
Replies: 65
Views: 759
Posted By dereckbc
You are welcome and I hope it helps. I...

You are welcome and I hope it helps. I participated in some of those discussions and had 3 request to do this.

You are correct for Ri to be meaningful has to be a controlled baseline reference...
Forum: Batteries & Chargers 12-11-2014, 09:11 PM
Replies: 65
Views: 759
Posted By dereckbc
What Is Your Battery Internal Resistance?

After a couple of request to start a thread for a possible Stcky thought I would give it a shot. So what is your batteries Internal Resistance (Ri in this discussion), and what can you do with it is...
Forum: Electric Ducted Fan Jets 12-11-2014, 06:38 AM
Replies: 36
Views: 367
Posted By dereckbc
One last comment on Puffing or Swelling. It is...

One last comment on Puffing or Swelling. It is nornal for the battery to get a little puffy during a full charge, or heavy discharge. After the battery cools the gas recombines back into a liquid...
Forum: Electric Ducted Fan Jets 12-11-2014, 06:17 AM
Replies: 36
Views: 367
Posted By dereckbc
Just a known fact. It comes from heating up...

Just a known fact. It comes from heating up either on the charge or discharge side.

Keep in mind what we call LiPo's are not really LiPo. they are Hybrid LiPo. True LiPo has a dry solid...
Forum: Electric Ducted Fan Jets 12-11-2014, 06:01 AM
Replies: 36
Views: 367
Posted By dereckbc
Those batteries are Not LiPo, they are LiFeP04...

Those batteries are Not LiPo, they are LiFeP04 aka LFP. LFP batteries are extremely safe and stable.
Forum: General Electric Discussions 12-11-2014, 03:20 AM
Replies: 30
Views: 7,169
Posted By dereckbc
If the FAA has their way, and the idiots flying...

If the FAA has their way, and the idiots flying FPV and UAV's keep doing what they are doing, RC planes will be illegal before long. There is a big push to ban the hobby.
Showing results 1 to 30 of 371

 
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