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Old 08-15-2008, 08:19 PM   #31
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No need for sprecial servos or recievers just a reciever pack and your all set.

Lipos are 3.7v per cell so 4.8 is impossible with Lipos.

The reason why something needs to be done is based on the fact that sub-c cells will be less and less popular as most classes will be running Lipos. This means fresh cells will be harder to get so 12th scalers will have a tough time finding cells. Add to this the ease of running Lipos and the extended cycle life.
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Old 08-15-2008, 08:22 PM   #32
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How much drop off in voltage are you seeing in a stock-type speed, 8 minute race? The large capacity should keep the curve pretty flat. I'm seeing 10,12, maybe 15 minute mains with something like this in 12th scale. Us electric guys can have long mains too right??
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Old 08-15-2008, 08:31 PM   #33
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I applaud the attempt to evolve but why can't a 4.8v cell be made and at least keep that the same
All LiPo cells are 3.7V. It's all related to the chemistry of the process. The nano-phosphate chemistry of the A123 cells limits the cell voltage to 3.3V. It's not like you can just pack more Lithium in there to boost the voltage.

It's analogous to why can't they make a NiCD or NiMH cell with a nominal voltage of 1.5V to match alkalines...

The one thing that A123 makes that is intriguing is the "Hypersonic Turbo" module that is basically a voltage regulator that boosts the output to few select voltages, at the expense of runtime. They were claiming 5-10% loss:
http://www.radiocontrolzone.com/show...1&postcount=79
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Old 08-15-2008, 08:34 PM   #34
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Originally Posted by sportpak View Post
How much drop off in voltage are you seeing in a stock-type speed, 8 minute race? The large capacity should keep the curve pretty flat. I'm seeing 10,12, maybe 15 minute mains with something like this in 12th scale. Us electric guys can have long mains too right??

Not sure as testing is just starting so we will see what kind of runtimes we can get but I would think 10 minutes with BL should be possible.
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Old 08-15-2008, 08:46 PM   #35
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Originally Posted by Danny/SMC View Post
Not sure as testing is just starting so we will see what kind of runtimes we can get but I would think 10 minutes with BL should be possible.
Awesome! Keep us posted on your findings.
Any idea what your price point might be? Sorry, but had to ask.
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Old 08-15-2008, 08:54 PM   #36
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Awesome! Keep us posted on your findings.
Any idea what your price point might be? Sorry, but had to ask.
As usual as info of test results come in I will let post them.

As far as pricing goes I'm not sure as our supplier didn't give us the price of this cell. I'm pretty sure it will not be cheap as it's high capacity and C rate. We could lower the C rate but I'm afraid it would impact the cycle life and possibly the performance. As we already know our Lipos have great cycle life that could justify the price not being on the cheap side. I will ask our supplier about pricing and post it once he responds.
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Old 08-15-2008, 09:54 PM   #37
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Getting LiPo accepted for mixed racing in similar voltage situations was a lot of work. It'll be interesting to see how things go over with 1/12.

1/12 is sort of the bastion of simplicity in R/C racing. LiPo will eventually make it even more so, but the transition to get there could be tough if it divides the class.
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Old 08-15-2008, 10:28 PM   #38
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I just got the pricing from our supplier and this pack will retail for 95.00 which means a street price of 65-70 bucks. He also mentioned that the capacity may go up to 6000 when they produce the packs as the current cells they made are handmade.
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Old 08-15-2008, 10:33 PM   #39
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Sorry to go off topic but when is your saddle pack going to be released ?
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Old 08-15-2008, 10:36 PM   #40
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End of the month we will start shipping to our distributors.
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Old 08-15-2008, 10:40 PM   #41
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End of the month we will start shipping to our distributors.
Sweet

What height did you end up going with on the saddle pack ?

I think if i remember correctly you were going to go with the same height as the trackpowers but changed because they were too high at 30mm .
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Old 08-15-2008, 10:48 PM   #42
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As a consumer, I demand 12th scale lipo. After reading many related threads, I honestly do not care why it cannot happen. It is not my job to figure out the solution, it is the manufacturers. My job is to fork over cash for products I want, and I want this product. Danny/SMC, thanks for listening to us consumers!
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Old 08-15-2008, 10:52 PM   #43
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Originally Posted by ffactory666 View Post
Sweet

What height did you end up going with on the saddle pack ?

I think if i remember correctly you were going to go with the same height as the trackpowers but changed because they were too high at 30mm .

I believe it's around 26mm but will know for sure by the middle of this coming week as we will recieve some production packs.
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Old 08-15-2008, 11:13 PM   #44
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Originally Posted by Danny/SMC View Post
I believe it's around 26mm but will know for sure by the middle of this coming week as we will recieve some production packs.
Thanks for that .
Could you post the measurements when you get the batteries .
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Old 08-16-2008, 06:37 AM   #45
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Quote:
Originally Posted by Danny/SMC View Post
I just got the pricing from our supplier and this pack will retail for 95.00 which means a street price of 65-70 bucks. He also mentioned that the capacity may go up to 6000 when they produce the packs as the current cells they made are handmade.
That's pretty cheap when you consider the cycle life, let alone the ease of maintenance. I haven't bought batteries in a while, but what's a 4 cell cost these days, $40+? This price point will be very fair.
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