SMC 5700mAh 25C Single Cell Lipo
#46
No balancing with this one either
#47
Hey Danny. Any idea on the weight of this pack? I think it might work in a T plate car with the battery on one side, receiver, speedo and receiver pack on the other. Plus the servo is off center a bit as well. With a little juggling it just might balance out.
By the way, what are most people using for a receiver pack on 12th scale nowadays?
By the way, what are most people using for a receiver pack on 12th scale nowadays?
#49
Hey Danny. Any idea on the weight of this pack? I think it might work in a T plate car with the battery on one side, receiver, speedo and receiver pack on the other. Plus the servo is off center a bit as well. With a little juggling it just might balance out.
By the way, what are most people using for a receiver pack on 12th scale nowadays?
By the way, what are most people using for a receiver pack on 12th scale nowadays?
I will have the weight when we get the pack in this coming week.
#53
#54
Tech Initiate
It wouldn't be hard to do a 'boost' regulator to get 5V for the receiver and servos from the 3.7V Lipo output. I sat down and did a schematic last night and will mess with the layout for it sometime this weekend if time allows. I designed for a 5V output at 2A - it would be easy enough to push the voltage up to 6V but most of the 1/12 size servos don't like over 5V. It would be possible to push the amperage output up (ie: vontage trans am 1/10 scale) but that would increase the size and the cost somewhat.
It get a little tricky (design wise) if the input voltage falls below 3V out of the lipo but I can probably find a way around that. Depending on the size of the battery package compared to the lipo cell it might even be possible to integrate the regulator into the battery case though there may be some heat dissipation issues to mitigate.
It won't be cheap in small volumes (probably $50 to $60 apiece in prototype quantities - I haven't done a full material list yet) but if this combo proves to be popular with racers the price should come down to a reasonable level as the production volume goes up.
It get a little tricky (design wise) if the input voltage falls below 3V out of the lipo but I can probably find a way around that. Depending on the size of the battery package compared to the lipo cell it might even be possible to integrate the regulator into the battery case though there may be some heat dissipation issues to mitigate.
It won't be cheap in small volumes (probably $50 to $60 apiece in prototype quantities - I haven't done a full material list yet) but if this combo proves to be popular with racers the price should come down to a reasonable level as the production volume goes up.
#55
Tech Champion
iTrader: (38)
If a receiver pack is required anyway then if there were a creative way to get all the power plant stuff in a single (probably larger) package I think it would be a neat product for someone to come out with. Just an idea. Not sure if its feasible or possible. I guess the challenge would be to get the single package to still fit in existing 12 scales which I assume is where the probably lies.
#56
Tech Lord
iTrader: (32)
Dealing with a 1S 5600mah pack and a 2S 350mah pack sounds like a recipe for a charging disaster. If you have to charge that 2S pack at least once a day, it's going to require lots of switching between profiles on a charger, or a second charger entirely. Putting 5.6A into a 350mah pack would suck. A "boost" regulator sounds a lot more eloquent.
#57
Tech Elite
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instead of all the receiver pack stuff, can't you run two cell and then limit the motors? Or will that equate to not enough run time?
a 7.2 volt receiver pack plus a seperate 3.7 volt lipo puts you why over the voltage of a two cell (7.4 volt) pack.
My understanding is essentially one pack drives the motor, and the other drives the servo/RX.
Why can't one pack do both?
It seems silly to run a motor on 3.7 volts and the servo on 7.2.
a 7.2 volt receiver pack plus a seperate 3.7 volt lipo puts you why over the voltage of a two cell (7.4 volt) pack.
My understanding is essentially one pack drives the motor, and the other drives the servo/RX.
Why can't one pack do both?
It seems silly to run a motor on 3.7 volts and the servo on 7.2.
#60
Not so sure I like the pack in pack idea for rx pack. If one of the batteries decides the world is too much, say rx pack, that is a lot of dead weight you are hauling around. Separate packs will allow you to swap things out if need be. There are also other solutions other than the 350mah heli pack from SMC, although the matching labels would look so cool for those 'designer jeans' types...