Li-Po

I think overall we agree.
My beef is that teh current marketing hype implies you can run these packs flat in 6 minutes from full to empty in any conditions with no ill effects. I do not believe that to be a true statement.
helicopter pilots seem to be the sorts offenders running at maybe 70% full power fpr as long as the packs will keep teh model up.
Unwary newbies are the second - those whose power systems require that (or whose flying habits dictate that) they run flat out to stay in the air at all.
Both seem to sugffer premature - er - failure.
Reply to
The Natural Philosopher
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acknowledgement
Well D.H., I am going to have to retract your promotion for criminal stupidity.
It is criminal to mislead others out of your own stupidity, and you do that so frequently many here figure there must be something religious about it. Try going back and reading the drivil YOU posted on 8/21 ~9:21 p.m. your time. Then try proving my comments wrong instead of blathering about the lack of need for safety.
Tell us WHY we should ignore professional electric engineers. Before you try that magical trick, validate YOUR expertise.
Try leading by setting the example.
I am patiently awaiting your LIEberal example D.H.
Reply to
Six_O'Clock_High
Hey D.H. we all sort of figured you would be extremely knowledgable in this area.
Reply to
Six_O'Clock_High
Honours degree in Electrical science, Cambridge, UK?
Oh dear.
Reply to
The Natural Philosopher
Why...Do you consider that Ignorance and freshness to an area of knowledge is somehow something to be ashamed of?
I suppose that accounts for the defensive nature of your posts every time the paucity of you knowledge and logic is exposed to public scrutiny.
The are two sorts of ignorant people. Those that are not ashamed to betray their ignorance, and set to to learn, and those who pretend the know, learn nothing and remain as ignorant as the day they were born...
You and others wanted to know what was going on 9/11...I and others told you in no uncertain terms.
So you have been shooting the messenger ever since in your attempts to deny the truth, because to accept it you would have to give up some cherished ideas about yourself and your country. *shrug*. I told you why, I told you more or less what would happen, and it has.
I didn't invent the situation, I didn't take any part in any of it, I merely told you more or less why it had happened, and why it wouldn't stop happening just because the Shrub made you a promise he couldn't keep.
Its not my fault if you don't want to face up to the fact that you live in a country governed by amoral people who are also completely inept and clueless about the rest of the world.
We've known that for years, and have been trying to do something about it. Without destroying what is worthwhile. You will learn eventually - you will have to, or suffer worse.
Now we have a few amoral and clueless people selling LIPO batteries. Believe them if you want. Or learn the truth by experimentation and experience.
You are, after all, a member of the country that accepts a 100kg weight penalty and a $300 dollar premium on every car that is equipped with airbags, simply because you are too lazy to strap a seat belt over your enormous guts.
Reply to
The Natural Philosopher
D.H., This is a MODEL AIRPLANE forum and the majority of your remarks do not fit that description. You might think about talking models instead of your corrupt philosophy. You are welcome to take all 300kg of your political cow dung and go pound sand.
Based on your remarks, I believe this "Honours degree in Electrical science, Cambridge, UK" horse manure as much as I believe you represent the Second Coming. In words of one syllable, NOT!
Now as for your drivel about LiPo batteries, the ONLY disagreement I am aware of is the fight YOU started when I mentioned that someone with experience I can PROVE and respect pointed out that all NON MODELING applications have chargers with logic built in to monitor and control the charge using thermocouples and that modeling usages needed to adopt that safer PROVEN technology . It is my opinion that the expense, both in extra weight and cost, is well below the risks involved for the average modeler without a PhD in electronics. Your position on the matter points to your bad attitude and the failure of your alleged education to teach you to THINK like a human being.
Reply to
Six_O'Clock_High
I know I know. You believe the Shrub is a intelligent honset man too.
Come over here and I'll show you the certificate.
Reply to
The Natural Philosopher
So or these li-po batteries any good then ?
Runs for door >>>>>>
Reply to
Mr_Flibble
*R*O*F*L*O*L*!!! D.H., your stupidity can be a real hoot from time to time.
You need to be a little more specific with your invitations.
Consider you latest foul up. Exactly WHO should I visit? Bet the boys at the Yard would have a fit were I to ask for the Queen. Problem is I don't KNOW anyone in that country, but I DO know that GWB is smarter than you simply based on the open and public evidence of his choices. The open and public evidence of your choices is not so glowing.
Mr._Flibble, I THINK the LiPo batteries are safe IF handled correctly. The proof of that is the millions of cell phones in service using them. The folks who make and sell the batteries and chargers for those phones seem to have found a way to make them safe enough for THAT application. However, *
I* do not have any professional designations in that field rather I pay attention to those who present those credentials. That leads me to believe that the modeling industry may have missed a couple of important issues with using this technology.
Reply to
Six_O'Clock_High
Certainly compared to the likes of you he is!
And a degree means simply that you completed the requirements for it to be conferred. It in no way means you actually know the material nor how to properly apply it!
Reply to
C.O.Jones
Yes, very good. Less good if you stress em hard, and downright dangerous if you seriously mistreat them.
Read and learn before messing with em, like bears, mostly they do what you expect, except ocasionally they don't, so it wise to look for warning signs :-)
Reply to
The Natural Philosopher
Well the same could be said of the so called Expert that DRIvel driver cited.
You can't have it both ways. I've got the qualifications, and the practical ecperience as a lifetime engineer, and they were enough to tell me that the so called weapons of mass destriction were bullshit from the start.
You see I have actually been involved in missile design. It was a long time ago admittedly, but something I worked on in the 60's actually shot down another missile in the Falklands.
I know what it takes to buld that stuff, but Shrub doesn't, and neither it appears did you.
Hell, the USA is living proof that all it takes is to fool enough of the people enough of the time.
Reply to
The Natural Philosopher
Keep thinking you know more than we do! Makes you an easier target with that great fat head of yours sticking up!
Reply to
C.O.Jones
| I would have thought that any measuring temperature would have to be | based on a CHANGE in resistance rather than the measurement of it in an | absolute sense - otherwise the charger wouldn't be able to accommodate a | range of batteries, or a variety of ambient tmperatures.
No, that's not how it works.
A temperature probe has a certain resistance which is a function of it's temperature. For example, 70 degrees = 100 ohms, 80 degrees = 105 ohms, 90 degrees = 110 ohms, 100 degrees = 120 ohms, etc. (These are just arbitrary numbers, made up by me. They aren't real world values.
In the real world, the function probably isn't completely linear, and the resistance could increase or decrease with temperature. The exact function will depend on what component exactly is being used to measure the temperature, and the wires used to connect it will add a (relatively) fixed value to that resistance.
At least with my Triton, I can program in a given temperature for it to shut off at. `If the battery pack hits 150 degrees, shut off.'
Another brand of charger might decide `shut off if the temperature goes up 30 degrees during the charge' ... and then that would be based on a change in temperature, but not (directly) a change in resistance.
Adding a small extension probably won't make a big difference -- I'm hoping that the resistance of the component used is much larger than that of the wires connecting it -- but somebody might just want to test it's accuracy after adding the extension rather than just trusting it.
Reply to
Doug McLaren

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