You are looking for a voltage multiplier, not an amplifier.
But, I am trying to imagine a 1/10 rig where 800oz of torque would not be enough.
That's a fair point. I was only thinking about getting all the bang for my buck and maximizing the servo output. I didn't really think about the "bang" being my steering links being ripped apart.
those holms hobbies servos have enuff torque to pull the treads out of plastic rod ends why bother with a seperate.battery
i have a 1/6th scale 20 pounder and the v3 will still toss the truck around on 3s the new ones have way more power than the old ones and they still have enuff torque to break parts
dont over think it just run direct power to the servo and be happy
That's some good information, thank you. (In my experience) I trust Traxxas plastic, but, I know HH stuff is pretty powerful as well. I don't know that I could trust the plastic that much. Now that you mention it, I might want to pick a few extra rod ends anyway.
Just run it off the main 3s directly. Unless you absolutely need the torque to break steering links or knuckles.
Lol. I do not. 875 is probably plenty.
Why not just get new 4s batteries to run it all? Something like a 3500 to 4000mah 4s would be about the same size and run time as a 5000mah 3s. Then you could also gear it down some and have even better low speed control and a stronger drag brake.
If you go with a separate 4s for the servo, as others mentioned those cheap plug in LVAs work great. I run them in my son's truck so I can easily tell when his trucks hit LVC.
And just to drive the point across, BECs can only lower the output voltage, not increase it. And since they aren't 100% efficient, it's always about 0.2v lower then the input voltage. So a BEC set to 8.4v with a 2s battery at most will be 8.2v (fully charged 2s is 8.4v), and will drop as the battery voltage drops. I know you don't plan on going this route, just wanted to add some more info. Now their are transformers (a buck and boost for example) that can increase DC voltage, but they are large, expensive, and would drain the battery noticeably faster then a normal BEC.
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Upping it to 4s was my next thought but I wasn't sure what the physical size of 4s would be compared to the Traxxas 3s 5000. I don't have room far a physically larger battery.
If I could up it to 4s, I can't gear down any farther due to the motor shaft size. 11 is the smallest I could find that will fit the motor shaft that that doesn't look like it'll explode the first time it's given power. I only found one 9t but there was hardly any meant behind the teeth.
Thanks the info in the plug in LVA, I might still need one in the future.
It sounds like powering through a BEC is out of the question anyway. They can't act as multiplier/transformer to boost power and a transformer would use excess power for very little benefit. Unless you see ripping your truck apart as benefit.
I'll just stick to directly powering the servo from my existing 3s, after considering the damage 1055oz/inch could do to my rig, I think 875 will be plenty.
I'll just have to find a new use for the existing BEC. They can used, tapped from the battery lead, to regulate power to a winch right? I might add a winch further on down road when I get closer to finishing the rig.
