Search: Posts Made By: ramboman
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Forum: Power Systems
07-30-2017, 08:40 AM
Replies: 324
Views: 131,489
Posted By ramboman

There are other factors like : * life...

There are other factors like :
* life expectancy
* ease of use
* charge speed
* discharge capacity
* cost
* size
* form factor

For the same "6s" brushless, I may use :
Forum: Power Systems
05-29-2012, 07:21 AM
Replies: 324
Views: 131,489
Posted By ramboman

Different simulators, including motocalc, give...

Different simulators, including motocalc, give very different results...
I have very good experience with Castle in various configurations:
* Torque 4014 with 6s2p a123 and 15*8 for .60
* ...
Forum: Power Systems
02-20-2012, 06:43 AM
Replies: 324
Views: 131,489
Posted By ramboman

Wink Sorry for hurting you, Steve, that was not my...

Sorry for hurting you, Steve, that was not my intention...
Just sharing experience !
Forum: Power Systems
02-20-2012, 06:38 AM
Replies: 324
Views: 131,489
Posted By ramboman

Thumbs down RIP

Thanks for the info... I thought nanotech was a potential alternative to a123... but with a life expectancy of 50 cycles... 10 days of flying... forget them.
Life expectancy of a123 is 1000 cycles !
Forum: Power Systems
02-19-2012, 06:18 PM
Replies: 324
Views: 131,489
Posted By ramboman

Cool Documentation

Most of my a123 packs are now assembled as 6s2p like this...
One exception is my Super Reaper that will have
* either 12s nanotech 5Ah @ 1984gr (5+5+2)
* or 14s2p a123 4.6Ah @ 1960gr +...
Forum: Power Systems
02-19-2012, 12:03 PM
Replies: 324
Views: 131,489
Posted By ramboman

Finally, I am happy with my approach and I don't...

Finally, I am happy with my approach and I don't force anybody to be happy !
* take your plane out of the car
* top up pack to be sure
do
* fly 10 min
* charge 15 min no need to balance
loop
*...
Forum: Power Systems
02-19-2012, 11:59 AM
Replies: 324
Views: 131,489
Posted By ramboman

And if you compare cheap LiPos with the best...

And if you compare cheap LiPos with the best cells of the world, sure they will be cheaper... you have to compare the best LiPos (nanotech) with a123...
Forum: Power Systems
02-19-2012, 11:54 AM
Replies: 324
Views: 131,489
Posted By ramboman

And you must leave 20% in a LiPo - you loose 20%...

And you must leave 20% in a LiPo - you loose 20% - when you use it.
You may use the a123 up to the end !
Forum: Power Systems
02-19-2012, 11:52 AM
Replies: 324
Views: 131,489
Posted By ramboman

And the weight of the connectors does not make a...

And the weight of the connectors does not make a lot of difference.
Forum: Power Systems
02-19-2012, 11:51 AM
Replies: 324
Views: 131,489
Posted By ramboman

You are wrong... Olevin Power are genuine a123...

You are wrong... Olevin Power are genuine a123 cells... at $7.99 each.
Forum: Power Systems
02-19-2012, 08:25 AM
Replies: 324
Views: 131,489
Posted By ramboman

Cool That's today on eBay...

look at this ;-)
Forum: Power Systems
02-19-2012, 08:17 AM
Replies: 324
Views: 131,489
Posted By ramboman

Cool Just look...

I bought twelve of them yesteday... they are true a123 and have solder legs... those I bought on eBay six month ago had no legs.
Forum: Power Systems
02-19-2012, 07:41 AM
Replies: 324
Views: 131,489
Posted By ramboman

Please, don't compare a123 with any other LiFe or...

Please, don't compare a123 with any other LiFe or LiPo... they are not in the same class of product... comparing with nanotech is ok !
Discharge rate is 30c; price is $7.99 at HK and around $6.50 on...
Forum: Power Systems
02-18-2012, 06:49 PM
Replies: 324
Views: 131,489
Posted By ramboman

Post Example: * 5s nanotech 5.0Ah : 805gr, $79 * ...

Example:
* 5s nanotech 5.0Ah : 805gr, $79
* 6s2p a123 4.6Ah : 840gr, $96
You are right !
But how many pack do you need to fly a whole day ?
With a123, you need only ONE and you charge in...
Forum: Power Systems
02-18-2012, 07:27 AM
Replies: 324
Views: 131,489
Posted By ramboman

Good idea! I glue my cells together with...

Good idea!
I glue my cells together with servotape (to be able to disassemble the packs) and I use soft electronic shrink wrap for protection.
I still have eight 6s1p packs in solderless tubes...
Forum: Power Systems
02-17-2012, 08:05 AM
Replies: 324
Views: 131,489
Posted By ramboman

Thumbs up hints

I am 67...
Finding the right brushless is not the most difficult task... because you have references...
Balancing a thermic converted to electric raises other problems...
Brushless is much lighter...
Forum: Power Systems
05-16-2011, 11:31 AM
Replies: 324
Views: 131,489
Posted By ramboman

another way...

I found on Hacker site a nice table...
Depending on model: 3D, Acro, F3A, Sport/scale... you have the weight, the motor (Hacker for sure), the controller, the LiPo (no a123 :-{...
So they would...
Forum: Power Systems
05-16-2011, 07:50 AM
Replies: 324
Views: 131,489
Posted By ramboman

just dream...

http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20070032058_2007033092.pdf
Forum: Power Systems
05-16-2011, 07:39 AM
Replies: 324
Views: 131,489
Posted By ramboman

just look...

http://tingilinde.typepad.com/starstuff/2006/09/lithium_batteri.html
Forum: Power Systems
05-15-2011, 06:33 PM
Replies: 324
Views: 131,489
Posted By ramboman

I removed the taps from my evaluation kit... with...

I removed the taps from my evaluation kit... with silver paste, the solderless tubes are OK... but modified for the balance cable.
Second batch came from UK, with taps... soldered...
Third batch...
Forum: Power Systems
05-15-2011, 08:16 AM
Replies: 324
Views: 131,489
Posted By ramboman

Hi Dennis like you, I fly with a123 since...

Hi Dennis
like you, I fly with a123 since 2006... first packs coming from a123 self... assembled in solderless tubes (rip+) as 6s1p... 8 of them coupled as 6s2p or 12s2p depending on plane....
Forum: Power Systems
10-24-2010, 01:05 PM
Replies: 324
Views: 131,489
Posted By ramboman

About a123...

Interesting thread... It would be nice to develop about a123.
I switched to a123 in 2006 for the following reason:
- need for 4 LiPos to fly ONE plane; a123 charges in 15min...
- difficulty to...
Showing results 1 to 22 of 22


 
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