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Old 08-16-2008, 06:37 AM   #46
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No balancing with this one either
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Old 08-16-2008, 07:13 AM   #47
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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?
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Old 08-16-2008, 09:10 AM   #48
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would be interesting if someone could combine the receiver pack with this type pack as a single package, two plugs. just a thought.
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Old 08-16-2008, 09:59 AM   #49
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Originally Posted by wingracer View Post
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?

I will have the weight when we get the pack in this coming week.
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Old 08-16-2008, 10:02 AM   #50
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would be interesting if someone could combine the receiver pack with this type pack as a single package, two plugs. just a thought.
That would use up a decent amount of room which would reduce the packs capacity.
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Old 08-16-2008, 10:07 AM   #51
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That would use up a decent amount of room which would reduce the packs capacity.
With this new cell, what motors are we going to be able to run, 10.5, 13.5?

Lipo is new to me but very interested in running this in oval.
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Old 08-16-2008, 10:10 AM   #52
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You know, I'm looking at this and thinking to myself,

5.7 amp-hours, has to be much lighter than NiMh, in a 1/12 scale car, combined with 300 or 380 sized brushless motors,

and you're looking at potentially 20 minute mains! Yea!
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Old 08-16-2008, 10:32 AM   #53
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Or you could just buy a motor and run it without worrying about getting that slight speed advantage.
LMFAO
You dont know miller tyme
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Old 08-16-2008, 10:43 AM   #54
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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.
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Old 08-16-2008, 11:43 AM   #55
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That would use up a decent amount of room which would reduce the packs capacity.
How much capacity would be required to go 8 minutes? Just curious

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.
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Old 08-16-2008, 12:41 PM   #56
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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.
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Old 08-16-2008, 12:46 PM   #57
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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.
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Old 08-16-2008, 12:54 PM   #58
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LMFAO
You dont know miller tyme
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Old 08-16-2008, 12:57 PM   #59
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I can't wait to see what the logistics actually work out to. All this stuff sounds fine and dandy, but until you start fitting all this stuff onto a little 12th scale, we won't know how it's actually going to work.
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Old 08-16-2008, 12:59 PM   #60
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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...
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