SMC 5700mAh 25C Single Cell Lipo
09-26-2008, 12:49 PM
#212
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.
09-26-2008, 06:06 PM
#213
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.
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.
09-26-2008, 06:15 PM
#214
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 06:16 PM. Reason: fat fingers
09-26-2008, 06:38 PM
#215
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.
09-27-2008, 05:02 AM
#217
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.
09-27-2008, 06:03 AM
#218
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'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.
09-27-2008, 06:32 AM
#220
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..........
Testing looks like its going quite well with the car looking dialed in every run.
Stay tuned for more info..........
09-27-2008, 10:32 AM
#222
but you also got to remember that the esc takes the 7.4v but only supplys 6v to the rx..
09-27-2008, 11:54 AM
#223
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.
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.
09-27-2008, 01:13 PM
#225
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. 