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Old Nov 14, 2006, 10:36 AM
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formosa2 with a123s ?


any one put the a123s in a formosa 2 or even a one ,, some were some one did put the a123s on a slow stick , sais they got 45 min of serious flying from them , that was on just two cells ,i love the formosa 1 ,,but want a 2 real bad ,
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Old Nov 14, 2006, 11:47 AM
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Whats a 123s?
Old Nov 14, 2006, 12:05 PM
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A123's are the new 3.6 volt Lithium Nano-Phosphate batteries that come inside the DeWalt 36 volt cordless power tools. Each cell is 3.6 volts nominal with a 2300mah capacity. They are capable of 30C continuous discharge rates (69 amps) with bursts to 40C (92 amps). They weigh 70 grams per cell for loose cells, and around 73 grams per cell with the welded tabs.

If cared for properly they can deliver at least 1000 charge cycles, and if you keep the current draw down to under 10C, 2000 charge cycles are possible. They have a solid aluminum outer can, so they can take bumps and bruises that would destroy a Li-Po battery.

I did a How-To thread on how to disassemble one of the DeWalt packs to harvest the cells a few weeks ago. Here is a link to that thread for more information.

Disassembly of a DeWalt 36v battery pack


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Old Nov 15, 2006, 07:47 PM
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nice write up too it was , i want to try them in a formosa 2 the bigger one ,, whats your thoughts on that ,, id be happy if it flew only as good as the formosa 1 does on the nh 9.6 pack ,
Old Nov 22, 2006, 01:30 PM
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any one else interested in this
Old Nov 24, 2006, 10:37 PM
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anyone have any info or experience with this topic?
Last edited by unoguy; Nov 24, 2006 at 10:46 PM.
Old Nov 25, 2006, 01:28 AM
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A 3-cell A123 pack has an open circuit voltage of 3.6 volts per cell or 10.8 volts, which makes it about the same as the open circuit voltage of a 8-cell Ni-MH pack. The cells weigh 73 grams each with solder tabs, so 3 cells weighs 209 grams, and by the time you tape it up and add a power lead, it will weigh around 220 grams or 7.75 ounces. The A123 cells have a capacity of 2300mah. 2300mah Sub-C Ni-MH cells weigh around 2 ounces each, so an 8-cell pack of these would weigh about a pound. This makes the A123 pack about 1/2 the weight of Ni-MH cells.

It looks like the A123's would be a big step up from Ni-MH cells!

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Old Nov 25, 2006, 04:57 AM
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I fly my Formosa II with three Emoli cells, a TP2908 and a GWS 1170 prop. With three A123 cells you would need a slightly hotter motor because the voltage is lower.

Len
Old Nov 25, 2006, 12:42 PM
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formosa2


this is starting to look like it might work ,, thanks guys ,,, btw how much time are your getting with that set up , and do u fly mild to wild or some were in betwwen
Old Nov 26, 2006, 07:17 PM
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Some where in between. It climbs straight up to the limit of sight, but not real fast. In level flight it is fast enough; the seven inch pitch probably helps. I haven't timed any flights. I would guess over ten minutes, but it could be less. I don't run the batteries to cut off.

Len
Old Nov 27, 2006, 11:04 PM
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formosa2


gone to have to gety one i think , i love the formosa1 i just have it stock but i do like how it flies once i got 13min40 secs on it , iam trying to get 15 out of it on the 350 brushed , and a 9.6 , i just got a lipo so ill try that next i do use quit abit of throttle managment to get the times iam getting , as for the formosa2 , whats the longest flight times anyone has got what set up , and what kind of flying are u doing to get it ,,,,,,,,,,, iam still learing just been doing this for 5 months now i startted with the slow stick ,,next was the estarter , an now the formosa1 ,,,,,,,,, i have not went to brushless yet i have a gws 18 i may try soon but right now the stock motors are fast enough for me , on down wind i think i might be hitting 35 to 40 mph love the flyby , had a friend let me fly his bristol scout , at nite lol it was great , isure ill have one them too soon ,,,,, love this hobby
Old Nov 30, 2006, 12:41 PM
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i would love to see pics of these a123 packs in a formosa 2
by the way kelly is a chump
Old Dec 01, 2006, 03:30 PM
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chump


Quote:
Originally Posted by val1756
i would love to see pics of these a123 packs in a formosa 2
by the way kelly is a chump
yep i isand i want to see pics too
Old Nov 28, 2007, 10:46 PM
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a123s flight duration ,in your small or large planes


Quote:
Originally Posted by LenBFP
Some where in between. It climbs straight up to the limit of sight, but not real fast. In level flight it is fast enough; the seven inch pitch probably helps. I haven't timed any flights. I would guess over ten minutes, but it could be less. I don't run the batteries to cut off.

Len
a year ago i asked about the use of these in gws formosa ,, well i still see just the 6 to 8 min times ,, iam sorry but iam not gone to be happy with that ,, has anyone gotton , over 15 min with the a123s the 3s ,
iam kinda ruined now that i been getting anywere from 20 to 60 min in the small stuff ,, but i do want to fly bigger just want to fly longer than 6 min ,,
Old Nov 29, 2007, 03:03 PM
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Quote:
Originally Posted by kgn831aa
a year ago i asked about the use of these in gws formosa ,, well i still see just the 6 to 8 min times ,, iam sorry but iam not gone to be happy with that ,, has anyone gotton , over 15 min with the a123s the 3s ,
iam kinda ruined now that i been getting anywere from 20 to 60 min in the small stuff ,, but i do want to fly bigger just want to fly longer than 6 min ,,
Your paying 3x the cost to get that run time. You can charge these Cells in as little as 10-15 minutes. Have a couple of theses packs and you can fly, Charge fly non stop. Just land and rotate packs.


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