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Old 11-02-2008, 05:29 AM   #316
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I tested 1-cell Lipo last night and here is an update. We ran Oval at Rosewood with a 13.5 Novak Motor and was very surprised on how fast it was.

21.5/2s 3200 SMC - 4.0's ending with 4.2's
13.5/1s 3600 SMC - 4.3's ending with 4.5's

We were geared about 10 teeth higher than what is run there with 13.5/4-cell NiHM. Motor temp came off around 90 degrees on the endbell side.

First run was tested without a reciever pack. The car ran for 6 laps and then I lost throttle. After a few second the car had throttle and I was able to run another 3 laps before loosing throttle again. I had an LRP TC with the 4-cell racing profile selected (no Lipo cut-off). Again after a few second I was able to take off and after 4 laps I lost all radio signal and hit the wall!

Hooked up the 2s 1200 receiver pack w/Novak 5amp BEC (8.4v down to 6.0v) and then ran for about 10 minutes straight.

21.5/3200 carpet weight is 38 oz. My 1s car weighed in at 36.2 oz. w/receiver pack & BEC. There is a 3 oz. difference between the 1s 3600 and the 2s 3200 battery.

Many were very surprised on how fast the car was. We will be at Greeneville, TN next weekend to test for the Oval Masters. We'll lay down a few laps up there as well.

The one thing I noticed right from the get go was the lack of "grunt" but top end was awesome. This pack eliminates wheelspin issues but still has plenty of top end.
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Old 11-02-2008, 07:42 AM   #317
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That's great news. There's been a lot of speculation flying around lately, so any hard data is a real plus. I'm tired of the negative opinions.

I have motors, receiver packs, and a switch rigged up for a super neat install on my DB12R, and as soon as these packs are available I'll be ready run some laps.

I hope we can have some of these before Christams. I have two weeks off then and I'd love to really put some time into dialing in this setup.

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Old 11-03-2008, 05:27 PM   #318
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Quote:
Originally Posted by Fred_B View Post
...A 5 volt regulator will set you back less than $2 at your local radio trash. Keeps everything at a reasonable voltage and it's just as high or higher voltage than you had with 4 cell and the speedo's BEC.
I see the regulator - has 3 pins - I am assuming an in, and out and ground? Just make a cable with one in-line - the in to the battery(red), the out to the servo(red) and the ground to the (black)servo wire. Just plug the servo into it?

or orange and brown

Thanks
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Old 11-03-2008, 05:39 PM   #319
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Yeah, you kinda have to look up the pin out on the regulator (many are different) but it's normally a common ground, input (+ LiPo in this case), and 5v output (ground and this pin to the receiver).

Just put in a switch (battery side) and you're all set. A switch on the receiver side would still drain the battery.
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Old 11-03-2008, 05:55 PM   #320
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Yeah, you kinda have to look up the pin out on the regulator (many are different) but it's normally a common ground, input (+ LiPo in this case), and 5v output (ground and this pin to the receiver).

Just put in a switch (battery side) and you're all set. A switch on the receiver side would still drain the battery.
I was actually thinking about JUST the servo, and keep the receiver at whatever came out of the pack. Just make a little adapter to protect the servo. If I went to a different setup, I could just unplug and go straight back into the receiver.
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Old 11-03-2008, 08:38 PM   #321
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Yes Andrew, weight. You are not going to want to lug around any extra weight running 3.7v. The weight limit at my track is going to be 680g for 1c Lipo. One of the main reasons for the whole Lipo deal was to make the cars very light to have less wear and tear, and tire wear. Also it's harder to make the 1c/13.5 run with 4cell/17.5 with out running light. Running light its right there.

-Donny
I just found this thread and am interested in the topic as Clegg is. It's fascinating to me because it seems a little backwards. Don't get all defensive please, I'm curious.

Can somebody explain the benefit of running a single cell pack? ie low voltage vs high voltage? Because every other high performance experimental RC vehicles are using HV set-ups. If light weight is what you are looking for there are better IMHO options.

Don't you have to run a second RX battery pack to run the electronics? Wouldn't it be simpler to run a 2S and a 21.5BL?

For the ultimate in light weight this is what I did years ago. I ran a 3S twin 600mah setup with a Mamba25/380BL motor and came in at around 500 grams. Here is a pic for those interested. The speeds were like a 4Cell 19T or so. Minimal tire wear as you said.
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SMC 5700mAh 25C Single Cell Lipo-edf3w-3s-1200.jpg  
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Old 11-04-2008, 06:04 AM   #322
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For me the reason to look at 1 cell LiPo is because the current standard is 4 cell NiMh. The current hard cased 2 cell LiPos are too big and powerful, however a 1 cell is a good size and with the reduction in weight, performance may be comparable enough to 4 cell NiMh for them to be run along side.
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Old 11-04-2008, 06:04 AM   #323
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I was actually thinking about JUST the servo, and keep the receiver at whatever came out of the pack. Just make a little adapter to protect the servo. If I went to a different setup, I could just unplug and go straight back into the receiver.
It's not necessarily a good thing to run the receiver at high voltage either. It's probably best to protect the entire system rather than just one component. Just plug one thing in and the whole system is protected.
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Old 11-04-2008, 08:22 AM   #324
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I have been running a small 7.4V lipo reciever pack in my oval and 12th car for over a year w/ no problems. I use this setup... LOSB0862 I added a switch to it...that's it.
I have a Tekin RS pro and an LRP sphere comp, the spektrum micro reciever (sr3500) and futaba (S9650) I like it.

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Old 11-04-2008, 08:50 AM   #325
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I put a 350mAh 2cell 7.4 volt flight power pack and a losi 6 volt regulator on my 10R5 and it only used 20 mA per race. I charge it every week even though its not required. All i can say is my servo never slows down and even if i practice till the drive pack dumps, I never lose control of my car. And I too vote for 1 cell drive battery. and a 10.5
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Old 11-04-2008, 08:21 PM   #326
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So when is this battery coming? I can't wait!
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Old 11-04-2008, 08:23 PM   #327
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So when is this battery coming? I can't wait!
Supposedly around next week. Donny Lia just got the production version I hear.
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Old 11-12-2008, 08:10 PM   #328
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It's officially next week. An update???
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Old 11-12-2008, 08:16 PM   #329
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Only 2 months late .. bout time. Sheesh ..
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Old 11-12-2008, 08:51 PM   #330
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Well I'm pretty patient, and if it takes longer to get it right I'd rather wait than to buy twice. I do have a lot of confidence in SMC's products, and am really anxious to get my car wrapped around this thing for some speed testing.
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