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e-Align T-REX 250-450-500-600 > A123 Racing 3S 2300 Turbo Pack - 3200 RPM @ 14.4V Setting
 
 
rerazor
Elite Veteran
Location: Mich.

My Posts This: Topic  Forum

If you buy the 10s1p 36v Dewalt packs off of ebay for approx $100 you them in larger Helis all day long. I run 10s1p in my L10e that is ballistic and 10s2p in my eR50 Ap setup. 15s1p in a 600mm heli is ballistic.
11-06-2006 Over year old.
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ShellDude
Elite Veteran
Location: East Coventry, PA

My Posts This: Topic  Forum		The updated Turbo module is shipping with all new orders. There was a time that you had to buy the module with one of their pre-made packs but they may be getting away from that.

They offer individual cells (and you can buy the dewalt packs). I will be buying more cells from them in the near future to experiment with different configs for better concealment. The turbo module itself is a hard one to hide

~~OCHC~~
http://www.glumbert.com/media/spiders
11-06-2006 Over year old.
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ShellDude
Elite Veteran
Location: East Coventry, PA

My Posts This: Topic  Forum		I've consolidated all the new test data at the official A123 forums for those interested:

http://www.rcuniverse.com/forum/m_4963958/tm.htm

~~OCHC~~
http://www.glumbert.com/media/spiders
11-07-2006 Over year old.
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hotgluedheli
Senior Heliman
Location: USA

My Posts This: Topic  Forum		Thanks for posting that shelldude. So there should be no cut out problem with this new module i would hope. I wish they would upgrade mine

I crash therefore I am
11-07-2006 Over year old.
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ShellDude
Elite Veteran
Location: East Coventry, PA

My Posts This: Topic  Forum		4 long days of work until I can finish up the 10.8v, 13.2v, and 14.4v tests. Fingers crossed for another nice weekend here.

It's hard for me to confirm the consistency of the drop-off having only one recorded session, but if it holds true, I will be buying a few more of these packs (probably just the tabbed cells so I can get creative with battery / turbo module placement).

I spent quite a bit of time working with A123 informally on this. I provided them quite a bit of data and I think Brian saw an opportunity for an unbiased review promoting their product.

With that said, it can't hurt to call him and ask, but I'd wait until the results are final.

Shell

~~OCHC~~
http://www.glumbert.com/media/spiders
11-07-2006 Over year old.
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hotgluedheli
Senior Heliman
Location: USA

My Posts This: Topic  Forum		Here is how I have my module setup on my heli. I just got an eagletree too but have not been able to post nice pics to here yet. Shell how do you post your eagletree test results? Do you use the print screen key?



I crash therefore I am
11-07-2006 Over year old.
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ShellDudeElite Veteran - Location: East Coventry, PA - My Posts This: Topic  Forum
Very nice! Damn... I can't even see the cells.... that's exactly the theme I'm after

Here's how I do my Eagletree exports:

First I get everything setup the way i want it using all the default windows sizes and click the Edit icon on the lower left hand corner of the 2D Graph screen (highlighted in red):



I then go to the Export tab, select JPEG as the Format, crank up the quality to 100% and click the Save...:



I host all my flight data jpegs locally on an HTTP server here at home. I'm not sure what affect the RR Image Process would have, if any.

Hope this helps,
Shell

~~OCHC~~
http://www.glumbert.com/media/spiders
11-07-2006 Over year old.
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hotgluedheli
Senior Heliman
Location: USA

My Posts This: Topic  Forum		Thanks a lot shell, I just got a medusa today but have not installed it yet.. i will post some results with it. Since I can't fly well yet.. i will buy well

I crash therefore I am
11-07-2006 Over year old.
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ShellDude
Elite Veteran
Location: East Coventry, PA

My Posts This: Topic  Forum		To be fully on the up and up about this. I may have already said it.

I paid full price for the Turbo Module with a 3S pack. I don't want to give the impression I'm being given special treatment or anything.

A123 offered to send me the updated version after I noted the extreme voltage cutoff (they had already explained to me that the module was not suitable for Helicopter use) and provided them all my flight data. When they informed me that the new module was ready, I promptly printed a USPS Priority label and had it in the mail to them the next day

I still can't get over that I had my Rex at 3,200 RPM today. It was some spooky stuff.

~~OCHC~~
http://www.glumbert.com/media/spiders
11-07-2006 Over year old.
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ShellDude
Elite Veteran
Location: East Coventry, PA

My Posts This: Topic  Forum
Quote 
Since I can't fly well yet

heh... don't sweat it.... I can't fly nearly as good as most of the regulars here. I still get sweaty palms doing stall turns when i'm not in the "element".

~~OCHC~~
http://www.glumbert.com/media/spiders
11-07-2006 Over year old.
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Kraeuterbutter
Heliman
Location:

My Posts This: Topic  Forum		Hi ShellDude !

great work !
i have not read everything (because i have no T-Rex)
but use the A123-cells for myself..

what iam wondering:

i have found this:

Quote 
The AUW difference between 3S native and 3S turboed (I don't see the point running it over 10.8V) in my setup is 907g vs 997g.


(my English is not that good, so)
do you mean with that: that the turbo-modul itself weiths 90g !?!

if so, why do you use a turbo-module ?
wouldn´t it be better to use a additional (71g) cell instead of that 90g heavy turbo-modul ?

benefits would be:
* no looses from the turbo-modul (here was stated: 90% eff. at best)
* 25% more capacity (4s instead of only 3s)
* even a little less weihgt

its realy a thing iam wondering..
(constant voltage is nice, but for that you have a Jazz which can compensate voltage-drops by the gov-mode)
04-27-2007 Over year old.
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ShellDude
Elite Veteran
Location: East Coventry, PA

My Posts This: Topic  Forum		My turbo module weighs 85 grams.

My logic at the time was that with a quality speed controller, such as a Jazz 40-6-18, I could easily change my headspeed / flight characteristics by simply clicking a button on the module.

What I found with the turbo module was that it is able to supply a higher nominal voltage and absorb amp spikes without any significant voltage loss much better than a pack could do on its own.

There were a couple drawbacks. First was duration. The more I guilded the lilly by increasing voltage on the module, the shorter my flight time was. Second was the overall weight hit.

If you're really concerned about weight then what I would recommend is to not use the turbo module and not add a 4th cell. Simply go with a bigger pinion to counter-act the lower voltage of the A123 3S pack. The M1 cells can take much more abuse than traditional LiPo.

Hope this helps,
Shell

~~OCHC~~
http://www.glumbert.com/media/spiders
04-28-2007 Over year old.
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write2dgray
Senior Heliman
Location: Seattle, WA

My Posts This: Topic  Forum
Quote 
Volts & Amps

Referencing the graph provided, doesn't the 2V sag under load (~12.5V to ~10.5V) seem high for A123s? I expected and it was stated earlier in this thread that the voltage sag was lower on these cells, but this seem to be in order with what I would expect from LiPos, and is clearly no better than LiPos which experience less than 1V drops on 40A loads in my 450 helis. Stronger LiPos show a .5V drop (dependent on headspeed/motor/pinion/ESC) typical.
06-16-2008 Over year old.
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ShellDude
Elite Veteran
Location: East Coventry, PA

My Posts This: Topic  Forum		Any voltage numbers seen being produced through the turbo module are not going to be reflective of the actual voltage being supplied by the pack.

For example, a 3S M1 A123 pack should have a full charge voltage of around 10.8V. The turbo module increases voltage with a price of more amps being drawn.

The voltage drops are happening with 30A peaks being measured between the turbo module and the ESC.

In another thread, I believe the one I made over @ RCU in the A123 forum, 30A between the module and ESC could be as high at 60A being pulled from the pack by the turbo module. Try that with your typical LiPo and let me know what the voltage sag looks like

Hope this helps,
Shell

~~OCHC~~
http://www.glumbert.com/media/spiders
06-17-2008 Over year old.
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write2dgray
Senior Heliman
Location: Seattle, WA

My Posts This: Topic  Forum		Aaaah, see! Now I get it. Thanks for the prompt response. To sustain higher voltage than the pack supplies the Turbo module pulls more amps than you are asking for and converts to higher voltage/less amps. So a 30A demand at the motor may draw 60A at the A123 pack to be supplied at a higher voltage. Makes sense, but I expected the Turbo module to hold a more steady voltage - 2V drops are quite significant.

- David
06-17-2008 Over year old.
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e-Align T-REX 250-450-500-600 > A123 Racing 3S 2300 Turbo Pack - 3200 RPM @ 14.4V Setting
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