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Home✈️Aircraft🚁Helicoptere-Century Radikal E640 - Swift 16 NX › a123 High Voltage Swift!
01-02-2007 03:14 AM  12 years ago
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litespeed600

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St. Charles, Missouri

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a123 High Voltage Swift!
Hey all,

Me again fab-in the Swift to run a123's on them since I keep sucking the juice out of the emoli's too quick since I've gone to the 550 blades. I custom made my emoli's to sit up high on top of the cf battery tray and removed the radio tray. This worked well till the first crash which snapped the cf plate right off the front with the nearly 1 1/2 lbs of batteries on it. I made a custom (don't laugh!) aluminum battery plate and never looked back. Having the batteries up high made the roll rate better and honestly flew better than them hangin underneath the heli. Kinda similar to a TREX 600 set up. I was running 8s on my Neu 1910-1.5Y with an 11 tooth pinion. Since the soldering issues and for pure simplicity with the a123 cells I decided to try and run a "brick" pack instead of my custom made packs, this way I could use shrink wrap also. I played and played with design idea's and this one seemed most logical and kept the weight up as high as possible while still being able to use the canopy. I dropped to a 10 tooth pinion since the headspeed seemed really high with the 11 tooth. I'm not for sure what it was but with these plastic main grips and 550 blades it kinda scared the crap out of me. I'm not for sure what voltage I should figure on while figuring headspeed on one of the online calculators, I've read anywhere from 2.6v to 3.2v under load.

The results were great. Bogging is quite non-exsistant although I can still feel the weight of the heli. I may need to design a lighter version of my battery shelf/holder but fear it won't be as crash worthy as the current set-up. I will find out, trust me! I got about 5 to 6 min of hovering and fast climbouts while trimming it. I hope to get atleast 6 mins when done. If not I may go to a 12 cell since my Shulze will go that high but then the battery tray will need to be redesigned, who knows. The whole battery tray/holder really tightened the frame up, it seems the cyclics are faster but I may have increased the headspeed with the battery/pinion change I'm not for sure. It feels fast though.

After adding the whole set-up the Swift was slightly nose heavy so I pushed the rudder servo back to staticly balance the heli and shortend the control rod (I said "rod!" hehe) and it balanced perfect. I haven't weighed the heli yet, I only have a postage scale that goes up to 4 lbs so that will have to wait till next time.

One comment on charging, I have a Shulze 6-330D with the new eprom v8.51 (or something like that!) anyway when I charge the 10s a123 at 5.5 amps it keeps giving me a low voltage warning. I have an 06 Dodge 1500 and the battery just can't keep up with this charger. It works fine if the motor is running but that doesn't work well with the garage closed up. Is there any el cheapo suggestions on a power supply that will work ok? I'll prolly get my Thunder Power charger upgrade as well so I'm sure it will do the same thing?

Any thoughts or comments?

Wifes a calling, time to take the Christmas tree down, Happy New year to all of you.

Tom

Below is the results.

Married with 2 kids, I am no stranger to pain!
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01-02-2007 03:36 AM  12 years ago
Rogue

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Windy City, IL.

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Very nice.....I'm planning on running an A123 setup as well. Century 600plus, CC45HV. Not sure on pin size or cell count yet. I haven't really sat down and done the math yet to see what I come up with. Still waiting on my Swift to come in the mail. I bought it used with an AXI 2826/8, CC60 on a 4s lipo with a 13 tooth pin gear. From what I hear with this combo the Swift flies pretty well. But you know how it goes....I want more power Keep us posted on your results because I'll be making the A123 change as well.

Rogue
If it doesn't fit force it.....If it breaks then it needed to be replaced anyway !!!
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01-02-2007 05:53 AM  12 years ago
litespeed600

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St. Charles, Missouri

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I used to run the 2826-08/ CC60 on my swift when I started.

You'll like the extra power for sure.

Tom
Married with 2 kids, I am no stranger to pain!
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01-02-2007 07:44 PM  12 years ago
Deem

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Kiev, Ukraine

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very nice design. one question - what is it "a123" - battaries? is it li-po or li-ion or ....? i'm flying at li-po "fly power" and "tanic" and have tested centurie's ni-mh 3300mah. thank you in advance!www.rcheli.com.ua
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01-02-2007 09:10 PM  12 years ago
cosmic57

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UK

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When you connect the Schulze 6-330d hold down the -ve button. This will reset the low volts alarm to 10v. Careful you still have enough to start the car though!
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01-02-2007 11:28 PM  12 years ago
borneobear

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Kuala Lumpur, Malaysia.

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Hi Deem,
Try A123 are from Dewalt packs: http://search.ebay.com/DeWalt-36V-Packs_W0QQfromZR40

Tha alum battery mount is really sweet. Thanks for sharing!
Whats the advantage of the 10s1p set up?
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01-02-2007 11:31 PM  12 years ago
litespeed600

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St. Charles, Missouri

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Hey Deem,

The a123 cells come out of the Dewalt 36 volt cordless tool packs. They are cells similar in constuction to a nicad (read metal shell) but higher voltage, 3.6v and a C rating of 30 to 50. With 2300 mah these cells hit over 100 amp peaks according to some of the testers with these cells.

Read here,

http://www.rcgroups.com/forums/showthread.php?t=566256

With 844 posts it will take some time!

Hey cosmic57,

Thanks for the tip!

Tom
Married with 2 kids, I am no stranger to pain!
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01-02-2007 11:43 PM  12 years ago
litespeed600

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St. Charles, Missouri

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Hey Borneobear,

The a123's are low amperage, 2300 mah, so you kinda need to go high voltage to get any decent flight times. With 10 cells I get about 6 to 7 mins of flight time. Also these cells are lower voltage, 3.6v vs 4.2v, which also plays a part.

Tom
Married with 2 kids, I am no stranger to pain!
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01-02-2007 11:57 PM  12 years ago
borneobear

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Kuala Lumpur, Malaysia.

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That was quick.
With so much weight, is it possible to do 3D on the swift with 10 cells up front? You did mention rolls are easier. Maan... crashes would be painful.

Thanks again.
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01-03-2007 07:49 AM  12 years ago
Deem

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Kiev, Ukraine

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litespeed600, borneobear
thanks - good and cheap idea! and what a weight of one battery/cell?
www.rcheli.com.ua
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01-03-2007 11:39 AM  12 years ago
Deem

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Kiev, Ukraine

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i'm find it: 70 grams per cell - http://www.a123racing.com/www.rcheli.com.ua
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01-03-2007 11:23 PM  12 years ago
litespeed600

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St. Charles, Missouri

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Well I got a few more flights in and I'm happy so far. I'm getting about 7 mins of flight which includes fff, flips, rolls and some major climbouts then I come in and hover another 30 seconds or so and then I can hear the power start to fade. As I start getting more agressive I'll run 6 1/2 mins and keep checking it out. I have 3 packs so far and with 30 min or less charging I should be ok after I get another pack and my TP charger upgraded.

I'm really, really happy so far.

Tom
Married with 2 kids, I am no stranger to pain!
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01-04-2007 12:07 AM  12 years ago
borneobear

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Kuala Lumpur, Malaysia.

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Hey Tom. I'm following your lead and getting myself some A123s. Also upgrading my TP1010 to the just released programme for A123 charging.
Thanks for sharing.
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01-04-2007 12:35 AM  12 years ago
litespeed600

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St. Charles, Missouri

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No problem-O!

Have fun with it.
Married with 2 kids, I am no stranger to pain!
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01-04-2007 04:33 AM  12 years ago
borneobear

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Kuala Lumpur, Malaysia.

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What BEC are you using for the 10 A123 Tom? Or are you using a separate receiver pack?
Thanks.
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03-08-2007 08:59 AM  12 years ago
Deem

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Kiev, Ukraine

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My new pack from a123 (did it too ). It have 7 batteries, and it's voltage and standard charge setup work most like 6 lipo. Understood, that 10s will be better for flight time, but my motor (neu1907) and esc (cc phonix 80) no working more 25-26 volts - can be smoked. And weight good too - nothing changing of balance.

www.rcheli.com.ua
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03-08-2007 12:13 PM  12 years ago
litespeed600

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St. Charles, Missouri

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Looks good.

Tom
Married with 2 kids, I am no stranger to pain!
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03-08-2007 03:12 PM  12 years ago
Deem

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Kiev, Ukraine

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today have tested - three flight with light dynamics (wind 6-9m/s). have flight very nice and easy ( like with my flightpower6s1p3700evo20), time of flight 6-6.30 min. and had two quick "hot charge" - very good and fast!www.rcheli.com.ua
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03-08-2007 03:50 PM  12 years ago
Eco8gator

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Palm Beach, FL

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Hello

If anyone is interested I have a very clean, highly modified, HV RTF Swift with 2x 8s A123 packs. Flys fantastic with monster power on 550 carbon blades. The only reason Im selling is I need a TREX SE for an upcomming project.

http://www.runryder.com/t330110p1/?p=2597632#RR

Carlo
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03-08-2007 10:51 PM  12 years ago
litespeed600

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St. Charles, Missouri

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time of flight 6-6.30 min.
That's a pretty good flight time for 7s a123's. I get about 6 1/2 to 7 mins with my 1910-1.5Y but it's kinda heavy collective management. I like my flips, rolls and inverted flying a lot.

I run 550's also, they really lighten the heli up!

Tom
Married with 2 kids, I am no stranger to pain!
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