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Other › 12s2p A123 pack???
01-24-2007 03:22 PM  10 years agoPost 21
pyaresquared

rrApprentice

Central Arizona

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OK. I get the watt meter part. But what about palm trees in Denmark? Do they really grow there?

Regards,
Steve S.

Surfin' the gravity waves

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01-24-2007 07:57 PM  10 years agoPost 22
ThomasJoehnk

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Denmark, Copenhagen

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No palm trees in Denmark except indoor. These pictures were taken in a heated 'greenhouse' attached to my house.

Hope I will get airborn with the A123's this weekend.

By the way: The small helicopter behind my Joker II is an Acrobat SE i just bought from somebody in Germany through ebay.de. A very nice machine, a little smaller than the Minijoker but built to the same high quality standards. See http://www.eheli-tuning.de.

:-) Thomas



Minicopter 3D and 3DD, TDR, TRex 700E (and a full size 90.000 cubic foot hot air balloon)

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01-27-2007 10:01 AM  10 years agoPost 23
ThomasJoehnk

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Denmark, Copenhagen

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Report from first flight:

Joker II + Actro 32-4 + 13s2p A123: 8 minutes and 30 seconds of hover. Batteries not empty. Headspeed not measured but properly around 1700. Batterytemperature just after landing less than 35 C (= 95 F).

So far I am happy with the pack.

:-) Thomas



Minicopter 3D and 3DD, TDR, TRex 700E (and a full size 90.000 cubic foot hot air balloon)

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01-27-2007 11:38 AM  10 years agoPost 24
ThomasJoehnk

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Denmark, Copenhagen

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Report from second flight:

Joker II + Actro 32-4 + 13s2p A123: 8 minutes and 49 seconds of FFF and mild 3D. Headspeed still not measured but properly around 1700. Batterytemperature not even warm just after landing.

I am still very happy with the pack.

:-) Thomas



Minicopter 3D and 3DD, TDR, TRex 700E (and a full size 90.000 cubic foot hot air balloon)

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01-28-2007 07:35 PM  10 years agoPost 25
ThomasJoehnk

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Denmark, Copenhagen

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Report from 3. flight:

Joker II + Actro 32-4 + 13s2p A123: 10 minutes and 5 seconds of FFF and mild 3D. Headspeed still not measured. Pack still not even warm after flight. Took 4315 mAh during charge after flight.

A very nice thing about these cells is that the power is consistent throughout the flight.

:-) Thomas



Minicopter 3D and 3DD, TDR, TRex 700E (and a full size 90.000 cubic foot hot air balloon)

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01-28-2007 08:26 PM  10 years agoPost 26
rerazor

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Mich.

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That sounds like a good setup. I have never been able to get the a123's hot in my L10e and raptor setups.

4315 out of 4600mah is nice. Maybe 11mins total and then the power will drop on you.

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01-30-2007 04:57 PM  10 years agoPost 27
pyaresquared

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Central Arizona

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Is there a substantial cost savings using the A123 batteries? I don't see much other benefit. Two 5s3p lipo packs have a combined weight of 1.7 kg and a capacity of 7500 mah at about 40V. One 12s2p pack weighs about the same, has about the same voltage, but only has a capacity of 4600 mah. Am I missing something?

Regards,
Steve S.

Surfin' the gravity waves

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01-30-2007 05:37 PM  10 years agoPost 28
tjmitchem

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Andover, MN - USA

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There is definitely a substantial cost savings. Most people are buying Dewalt DC9360 powertool packs and taking the cells (10 of them) out. I've gotten the Dewalt packs for $110 shipped on eBay.

There are also some other advantages to the A123 cells:

- 3C charge rate
- Durability in a crash
- Major current capability
- Major cycle life
- You can fly 'em till they drop without damaging them

Terry

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01-30-2007 06:50 PM  10 years agoPost 29
ThomasJoehnk

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Denmark, Copenhagen

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If you are only concerned about best power-to-weight ratio you should definitly go for Lipo's.

My reason for going the A123 route:

1) Much safer than LiPo. I don't want to loose my entire Joker setup because of a midair fire.
2) Said cycle count much better than for LiPo. I only need to get around 20 cycles before I pass my average cycle life with big LiPo packs (often caused by a single cell failure).
3) Can be safely charged without having to overlook the entire charge.
4) Can be charged at more than 1C (actually up to 8C !!!).
5) Cheaper than LiPo.

For smaller helicopters I will stick to LiPo.

:-) Thomas



Minicopter 3D and 3DD, TDR, TRex 700E (and a full size 90.000 cubic foot hot air balloon)

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01-30-2007 09:46 PM  10 years agoPost 30
pyaresquared

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Central Arizona

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Hmmm. Might be worth a try. I have toasted three Flight Power lipo packs over the past 8 months or so. (My Tanic packs, on the other hand, seem to be as good as the day I bought them.) I was going to ask Brian to try to build an 8000 mah lipo pack for my Jokers. Maybe I'll try a smaller A123 instead.

Regards,
Steve S.

Surfin' the gravity waves

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01-31-2007 05:53 AM  10 years agoPost 31
ThomasJoehnk

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Denmark, Copenhagen

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I have also swell three FlightPower packs (EVO 20 3700 12s1p) during the last 6 months - often within the first 10 cycles. If the A123 packs holds what it promises I will get ***much more*** airtime in the next 6 months than the last 6 months.

:-) Thomas



Minicopter 3D and 3DD, TDR, TRex 700E (and a full size 90.000 cubic foot hot air balloon)

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02-01-2007 03:10 AM  10 years agoPost 32
rerazor

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Mich.

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So whats the AUW of the Joker 2 with the a123's? What blades?

I want a Joker

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02-01-2007 07:15 AM  10 years agoPost 33
Arief

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Adelaide, AUSTRALIA

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Thomas,

It looks like things are working out good with the A123. I have had a couple of flights on mine too and I find it hard to get them warm after a flight. (however, I am only using 10s2p which equates to about 30 cells nimh which I'm used to)

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02-03-2007 10:08 PM  10 years agoPost 34
DANNO

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St. Petersburg, Florida

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a123 report

just want to post how the a123 12s2p pack is working. im using it on a fairly heavy maxi2. running 1300 with a kontronic jazz 55 and actro 32-4 and 16t pinion.

flight times are around 9 min before headspead starts to drop. 30 seconds later the copter doenst have enough power to hover. im charging with a 20 amp power supply as reccomended by brian at tanic. charges great from 110v ac in 15 min.

my only issues are charging from the car is difficult, as the power supply is 110ac. i have a super heavy duty 1700 watt inverter that i hook to the car battery, but the current draw is too much and draws the car battery down too low if i try and charge at 18 amps...the most i can charge from the car is about 11 amps. takes about 30 minutes.

i also reached the over temp on the esc twice when carrying extra weight.

ive heard of some charging with the shultz charger...how is that working and whats the max amps that thing can output?

thanks!
Dan

www.skypiximaging.com

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02-15-2007 11:34 PM  10 years agoPost 35
fergus

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Ireland

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Any updates on the a123 batteries guys. Im interested to here how they are working out?

Im using 10s lipo ( Flightpower EVO 20 2x 5s 5000) Jazz 55-10-32 and the actro 24-4 in my Joker2. I might be interested in buying some of these new packs if the reports are good.

I have the Schulze isl 6-636+ charger and a Maas sps-9400 regulated power supply - will these items be ok to charge these packs? What about Balancing?

I notice ye seem to use various voltages. I just want reliable packs for mild 3d and about 10 minutes fligt time - would 10s2p be enough or should I go for 12s2p?

On a side issue can someone tell me if 710mm Razors are too big for the joker2 with the stock white plastic tail blades?

Thanks

Fergus

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02-15-2007 11:45 PM  10 years agoPost 36
R0XoRiZoR

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Austin, Texas - US

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I run 7s1p on my trex 600...5-6 mins
Its a boat in the air with the slow headspeed....
7s2p should get me around 8-9 mins...

Nevermind those nay sayers that say it can't be done...

Once i get a digital camcorder ill hook you guys up. My SLR is in the shop :-( (nitro is no good for them apparently)

Just remember... it won't 3d... not even close... hehe

10s1p is the 3d ticket

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02-15-2007 11:54 PM  10 years agoPost 37
fergus

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Ireland

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Forgot to ask any suppliers of pre built packs in Europe. the Tanic Packs route is tempting as im not the best with soldering but shipping from the US and taxes could take the gloss off the price?

Fergus

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02-28-2007 04:09 AM  10 years agoPost 38
rerazor

rrElite Veteran

Mich.

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Any latest updates on 12s2p a123's??

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02-28-2007 11:25 AM  10 years agoPost 39
ThomasJoehnk

rrApprentice

Denmark, Copenhagen

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Nope, haven't been out flying for two weeks due to a broken transmitter :-(

thomas



Minicopter 3D and 3DD, TDR, TRex 700E (and a full size 90.000 cubic foot hot air balloon)

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03-31-2007 06:53 AM  10 years agoPost 40
ThomasJoehnk

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Denmark, Copenhagen

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Hi

I have now logged 15 flights on my A123 13s2p setup.
Charge Flighttime Remark
? 8:30
4245 8:49
3903 10:01
4314 7:03
4238 6:53
3162 ?
3740 7:59
4266 8:43
4460 10:45
4123 8:47
3680 8:05
3568 9:45 Empty
4543 8:55
3808 10:42 Empty
4554 8:40
3730 10:39 Empty
4557 10:47 Empty, my first flight with
inverted hover in eyelevel!
4543
In 4 of the flights I flew until the pack was completly empty. When recharging an empty pack the pack takes 4550+-10 mAh back - impressing close to the stated 4600 mAh capacity.

An 13s A123 pack more or less equals a 10s LiPo pack (voltagewise). My Joker II flies fine on this voltage, but in order to get extreme power I have now ordered a 15s A123 pack (which more or less equals a 12sLiPo pack voltagewise). Should receive it within a couple of days.

:-) Thomas



Minicopter 3D and 3DD, TDR, TRex 700E (and a full size 90.000 cubic foot hot air balloon)

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