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HomeAircraftHelicopterHelicopter Main Discussion › A123 battery for the 700 class macjine....?
03-21-2015 05:12 PM  3 years agoPost 61
Four Stroker

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Atlanta

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I take him at his word - "A123 chemistry is superior to LiPo"

But we as modelers are only interested in the cells as constructed. We are not going to take them out of the cans and roll them flat.

A low head speed sport 700 could easily use an A123 pack - if it will fit.

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03-21-2015 05:16 PM  3 years agoPost 62
Aaron29

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USA

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It's a bold claim deserving of an answer. The corrolary is if a manufacturer wanted to, it could make an A123 with energy density superior to Lipo?

Superior flight time. Superior safety. Superior cycle lifetime.

All ours for want of a better containment method?

Why has this not happened? Can we make it happen? We have no reason not to want this.

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03-21-2015 05:21 PM  3 years agoPost 63
Four Stroker

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Atlanta

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No I don't think that is going to happen. I don't know how to measure superior chemistry but apparently it has nothing to do with weight.

0.68 is a little better than I was expecting. I doubt that A123 will fit between the side frames of most helis.

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03-21-2015 05:23 PM  3 years agoPost 64
Aaron29

rrProfessor

USA

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The claim was that in terms of energy density, it has superior chemistry.

If this cannot be realized due to containment limitations, then that fact has no practical use. And that would explain why it's gone nowhere. This was my point early on, but I was subsequently deconstructing it because I was getting a vibe that this is something that could be overcome.

Oh well. A123's are heavy. Got it.

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03-21-2015 05:41 PM  3 years agoPost 65
Ace Dude

rrProfessor

USA

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I guess wiping out with LiPo's would not turn out well. Tesla has gone to 18650 LiIon cells for energy density and weight density and volume density.
I'm sure risk management was a big factor in the decision to use 18650 LiIOn cells was well....

  

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03-21-2015 06:02 PM  3 years agoPost 66
fenderstrat

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Aston,Pa

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Keep in mind there are other contributing factors.the trend has been lighter helis with more compact frames.There is the physical need to be able to fit a pack into the heli and be able to swap batteries relatively quickly.there is also CG.any heli where the batts are up front,you can just about forget adding that much weight.It will end up being a balancing nightmare.People are not saying a123 are not great batteries with advantages over lipo,they certaily are.But when it comes to rc heli flight,most want the convience and weight of lipo.I just have to laugh,guys want the lightest heli possible to the point of going all cf and trimming wires and connectors,and you are going to turn the heli into a brick,because?

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03-21-2015 06:51 PM  3 years agoPost 67
Einzelganger

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Campbell, Texas

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I'm scared of lipos. There. I said it.
The idea that my toys might burn down my home or my shop and maybe kill my family?
Sure. Safe handling techniques and practices will minimize the risk, but I've caught myself driving on the wrong side of the road before unknowing.
If you've ever had a hot-start with a nitro, you can see my point. Totally avoidable.........in a perfect world with perfect concentration......and no distractions.
If a safe electric helicopter with less power than a lipo bird and equal if not greater power than a nitro existed, I for one would be interested.
These are toys. They cause an adrenaline rush and an immense feeling of satisfaction. I have discovered in my advancing years that I am not immortal and tend to avoid situations that prove it.
This concept has merit IMHO.

Wayne

I love the smell of nitro in the morning.
RIP Roman

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03-21-2015 07:32 PM  3 years agoPost 68
fenderstratrrProfessor - Aston,Pa - My Posts: All  Forum  Topic

Yes thats basically the conclusion.the concept has merit,a manufacturer needs to do something about the weight and package and its a winner.until then we have lipo.Unless you were to design the heli around a123 to optimize weight and battery placement.But for now other than a 450 switching to 123 on a heli designed around lipo just isnt practical

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03-21-2015 07:49 PM  3 years agoPost 69
Aaron29

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USA

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No, not practical. But a large part of the electric community did N to E kitbashing before specialty made E kits were common. Sometimes the hobbyists lead.

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03-21-2015 07:51 PM  3 years agoPost 70
BobOD

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New York- USA

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So, how many of you actually have any experience with a 700 class macjine?

Team POP Secret

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03-21-2015 07:52 PM  3 years agoPost 71
Four Stroker

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Atlanta

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A low head speed Mikado 690 is big enough for A123 packs about 10S2P.

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03-21-2015 07:56 PM  3 years agoPost 72
Ace Dude

rrProfessor

USA

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Practicality is a matter of personal choice. Lots of folks may not consider scale, turbine, or gassers practical either, but many enjoy them and have great success with them. If someone wants to experiment so be it. Often times experience is the best teacher.

  

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03-21-2015 08:40 PM  3 years agoPost 73
fenderstrat

rrProfessor

Aston,Pa

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Nobody is stopping anybody from doing anything,its a hobby.have at it.Wire up some packs and let us know.I am just stating why guys gave up on it first time around

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03-21-2015 09:19 PM  3 years agoPost 74
Ace Dude

rrProfessor

USA

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Even A123 (i.e., A123Racing) gave up on it.

  

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03-21-2015 09:26 PM  3 years agoPost 75
Einzelganger

rrKey Veteran

Campbell, Texas

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I've given up on some things that I shouldn't have.
Others come along with just a little better insight and more perseverance and presto. Magic.

Wayne

I love the smell of nitro in the morning.
RIP Roman

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03-21-2015 10:44 PM  3 years agoPost 76
es1co2bar3

rrKey Veteran

winnetka california

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I don't know who you consider as everybody.....!
You might wana shelves that lines man. The LIPO
is consider classic because it widely use the
A123 is practical item because it's more like a concept
item that has proven over what we think is better.

If you never Rig up and use it then you don't know what your really missing.

Further more it's use in every aspect of the hobby.
you simply can't say that.

I was waiting on some honey but there aren't no Queen bee,

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03-22-2015 01:48 PM  3 years agoPost 77
fenderstrat

rrProfessor

Aston,Pa

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you can sit there typing smart ass responses all day long,put your money where your keyboard is.wire up some a123 packs for a 700 not a 450,and show me some video of you flying it...simple as that

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03-22-2015 05:28 PM  3 years agoPost 78
Four Stroker

rrElite Veteran

Atlanta

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This thread has taken a dump and Mark RR should shut it down.

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HomeAircraftHelicopterHelicopter Main Discussion › A123 battery for the 700 class macjine....?
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