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Old 09-26-2008, 08:32 AM   #211
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Hi Brian,

Yes, you have to run a receiver pack with the single cell. The little Lipo receiver packs last a long time, and take up minimal space on the chassis.

Have a great day.-Bruce

......... Plus it's good for the extra weight anyway!
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Old 09-26-2008, 01:49 PM   #212
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just curious why you need all that new gear like an esc if you go to a small motor? novak makes a sensored 380 size motor...
Because the smallest motor in the 380 series is rated at 125W for 6min using a 2S LiPO.

Using a 13.5 Motor and 1S lipo the power will be just under 100 watt rating. And a 17.5 would be about 65 watts.

Coverting to Lipo should be easy as just buying a LiPO. If the 2S approach was used, then either racers would have to buy new motors like the 21.5 and there would be no stock class or they would have to buy a 28mm motor like the Three80 and a conversion motor pod for the smaller motor and the speeds will be stilll too fast for Stock.

Converting to LiPO using a 1S 3.7V lipo would be as simple as just buying the battery. For a while RX packs may be needed, but as time go on the ESC's will have step-up BEC built in.
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Old 09-26-2008, 07:06 PM   #213
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To answer the question, yes you could run the little novak motors. Besides all the power issues (it won't be slower than 17.5 and 13.5) you won't have a modified motor available. Also, only Novak makes a sensored 380 sized motor.

The biggest thing for me is the cost when you compare single cell to 2 cell LiPo. A 3800-4000 mAh single cell pack is going to come in at a price that's close to the cost of a good 4 cell pack now (maybe even a little less). To get the same capacity with 2 cell voltage you're going to pretty much double the price for the same capacity pack.

For single cell you would need to buy a LiPo for about $40 and a receiver pack for about $20 (less for a NiMh receiver pack). Just assemble the receiver pack and you're ready to go.

For 2 cell you would be spending closer to $80 for the same capacity pack and you need to buy a new motor at least. Plus cobble it together if you're running the small motors. Add a speedo and pinions (or some dumb adaptor) if you're running any of the other motors that have small shafts.

To compare that to what we have in 4 cell now, you can run just about all season on a couple of packs and be reasonably compeditive. My SMC pack lasted from Cleveland all the way to the end of the season last year. I could have club raced on 2 packs. The tire bill in mod is way more than you need to spend on batteries.
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Old 09-26-2008, 07:15 PM   #214
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Hello Sir,

Do you have any suggestion as to what lipo receiver pack to use? Links?


Danny/SMC: Is this available now or any idea when will this be available?

Thanks guys!!
Try looking at the airplane places like here:

http://www.homefly.com/products.asp?id=30

If you want the good old reliable NiMh cells shoot me a PM I have a couple hundred left...

Last edited by Fred_B; 09-26-2008 at 07:16 PM. Reason: fat fingers
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Old 09-26-2008, 07:38 PM   #215
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i just picked up a 200mah receiver pack from 360 RC Speeday made by Top. i was planning on using this for 1/12th mod with a bad ass motor but a 1c lipo might be my second reason for needing a receiver pack.
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Old 09-27-2008, 12:35 AM   #216
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these things rule
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Old 09-27-2008, 06:02 AM   #217
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i just picked up a 200mah receiver pack from 360 RC Speeday made by Top. i was planning on using this for 1/12th mod with a bad ass motor but a 1c lipo might be my second reason for needing a receiver pack.

Will we have to use something to step the voltage down, or do we just plug n play? If using this, we will then also have to remove the red wire from the speedo receiver lead?

I'm unsure of some of the details and would really like to avoid fire at all costs. I'm trying to sell this idea around my local track and really need all the details locked down.
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Old 09-27-2008, 07:03 AM   #218
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Will we have to use something to step the voltage down, or do we just plug n play? If using this, we will then also have to remove the red wire from the speedo receiver lead?

I'm unsure of some of the details and would really like to avoid fire at all costs. I'm trying to sell this idea around my local track and really need all the details locked down.
i will be plugging this receiver pack into my receiver as it is sold. this pack is at 7.4v -- but i'll be first using it when combined w/ a 4c 4.8v pack. now im on the hunt for a simple, low amperage lipo wall charger.
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Old 09-27-2008, 07:20 AM   #219
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i will be plugging this receiver pack into my receiver as it is sold. this pack is at 7.4v -- but i'll be first using it when combined w/ a 4c 4.8v pack. now im on the hunt for a simple, low amperage lipo wall charger.
Right, but will the 7.4volts hurt the receiver or servo? That, and should we disconnect the BEC, via the red wire, on the speedo receiver lead? I'm not sure we want to use both the BEC and battery.
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Old 09-27-2008, 07:32 AM   #220
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Got to see Donny Lia in action again running the single cell LiPo at 360 this past friday. He was still doing some testing and comparing lap times from his 4 cell/stock set-up and this time he ran the car with a 13.5 BL and put the required weight on his car and I must say the lap times were close to his stock/4 cell set-up.......... Quite impressive.

Testing looks like its going quite well with the car looking dialed in every run.

Stay tuned for more info..........
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Old 09-27-2008, 07:56 AM   #221
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Right, but will the 7.4volts hurt the receiver or servo? That, and should we disconnect the BEC, via the red wire, on the speedo receiver lead? I'm not sure we want to use both the BEC and battery.
i can only speak for the receiver pack. your electronics will be fine. any 6cell 1/10 scale already supplies this much voltage. i'm not going to touch any leads running from my speedo.
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Old 09-27-2008, 11:32 AM   #222
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i can only speak for the receiver pack. your electronics will be fine. any 6cell 1/10 scale already supplies this much voltage. i'm not going to touch any leads running from my speedo.
but you also got to remember that the esc takes the 7.4v but only supplys 6v to the rx..
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Old 09-27-2008, 12:54 PM   #223
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Most of the newer receivers are ok with the higher voltage (8.4 fully charged by the way) but it is hard on the servo.

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.
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Old 09-27-2008, 01:40 PM   #224
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I understand that, but do you have to disconnect the BEC? Will having 6v coming into the batt slot of the receiver, PLUS the 4 volts coming in the other terminal from the BEC cause any trouble?
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Old 09-27-2008, 02:13 PM   #225
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Yes... I THINK that you would have to disconnect the red lead from the ESC. Otherwise you will be feeding higher voltage fromyour receivier pack back to the lower voltage single cell LiPo.
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