ProModeler Servo: 420oz, billet case, o-ringed, $79

[MasteroFlego]

received my DS470 today, I must say I'm impressed. the machining on the case is flawless, and the can/bottle sleeve is a plus. does anyone know exactly how much torque it does @6.0v?

[mikemcE]

Originally Posted by 84yoda

2290 time.

I have thought about that. John has not had one do this, he said he was anxious to get it on the bench.
My thought is mechanicals, John is still harping 2s not 8.4 with a bec.
I had a temp gun with me when I shot the video, we saw a 85 degree average.


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[Ditchrat]

John

I appreciate your experience, but there is no way in hell I would run my servo off a lipo battery without have some type of low voltage cutoff.

I have yet to find a waterproof external alarm, even if I waterproof the circuit, which I have done, they don't have waterproof speakers. When the get wet they don't make much noise.

Besides that space is at a premium. You'd be hard pressed to find a small lipo with a designated balancing port to even run a lipo alarm.

It goes against the rules of safe lipo use.

Your logic and reasoning is sound, but in my opinion not a viable option for a scaler.

Give me a way to try it with out risking a fire and I'm game.

[Smokin' Joe]

I use a small 2S lipo (260 mah) to power my promodeler 420 V4. It does have a balance port and I initially used an alarm, but I found that my main battery pretty much always runs down first (3S 1000 mah). I don't use an external alarm anymore, I just change out the servo battery when it's time to change the main one. I suppose there is some risk of overdischarging the servo battery, but it hasn't happened so far.

[WHITE-TRASH]

Make a servo capable of 3s at the minimum and people will run it off of a lipo. This isn't the old men flying airplanes you're used to, we run hard and fast (albeit slowly at times) so adding a separate pack for a servo just isn't going to happen in a comp rig.

[mikemcE]

I’m sorta between, I don’t comp, but space is an issue, I can see swapping out both, but my 4300 will last a bit, not sure about a 250 or 300 lasting


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[84yoda]

John, using the esc bec, I totally understand what your saying but thats why we run external becs, so it has its own power supply and not interrupted at all. Im sure its still 'dirty' but nothing like an esc bec.

[JatoTheRipper]

If the servo is so finicky that it requires you to run it direct from a battery I don't want to be bothered with it. Running a servo directly from a LiPo is not a viable solution. Nearly every other servo is fine with normal power from the receiver or BEC.

[redemon]

Mine is running fine off the 1080 Bec. Or at least I havent noticed a problem anyway.

[spoo76]

Originally Posted by JatoTheRipper

If the servo is so finicky that it requires you to run it direct from a battery I don't want to be bothered with it. Running a servo directly from a LiPo is not a viable solution. Nearly every other servo is fine with normal power from the receiver or BEC.

I may be wrong here, but I don't think it needs a separate battery in every case. My understanding is that if you're running it at its max voltage it's best to use a separate lipo rather than a BEC set to max voltage because a lipo may be more stable than most BECs. Id think just turning down the voltage on the BEC to a normal level would be fine

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[Ditchrat]

Originally Posted by JatoTheRipper

If the servo is so finicky that it requires you to run it direct from a battery I don't want to be bothered with it. Running a servo directly from a LiPo is not a viable solution. Nearly every other servo is fine with normal power from the receiver or BEC.

This servo kicks ars. It runs fine on the hobbywing1080 bec and on my heyok bec.

I dont want to speak for someone else, but i see the post as if you want the absolute best performance John suggests battry power.

The way you feel about the 1080 is the way i feel about this servo.

[durok]

^^^My sentiments exactly... I got worried when I was informed of the separate LiPo recommendation but have basically decided to initially run mine from a new Mamba X. I did order a new Castle BEC 2.0 for possible future use. But I can't see ever trying to stash another baby LiPo somewhere in my Bomber or K10 Ascender!

[Crawler Cads]

My 470 runs perfectly off my BEC and that's the way it's staying
I have a middle of the road rig, coming in at 7lbs (3.5kg in the UK at least) and i run the BEC below your threshold with no issues on performance at all. That's big 2.2 tires which are quite heavy.

Still an awesomely shiny bit of kit thanks John

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[Jim85IROC]

I think people are too critical of BECs. On cheap ESCs, sure, they probably have issues, and even on well designed ESCs they may indeed be inexpensive, but that's because it's a $.50 switching regulator chip, a diode, a capacitor, an inductor and a couple resistors. The inductor is the only expensive part of that circuit. It doesn't mean they're ineffective. This same type of regulator is used in 99.9% of electronics that have DC voltage flying around somewhere inside. It's a mature technology, and one that can be very stable when designed properly.

That said, I think the need for "stable" power is being blown out of proportion too. The 2nd order filter on the output of these things is going to pretty much eliminate all high frequency crap. The only remaining signal issues is some ripple at the frequency of the switching in the regulator chip. A "dirty" signal might have 200mV of ripple, which I don't see as a problem for a servo. You're not going to feel any pulsating or anything like that because the ripple level is too low, and is at too high of a frequency to be apparent to humans. The only real issue that I see with any decent voltage regulator is whether or not it can supply the current that the servo needs. So far in my own experiences, the regulator in my Mamba X ESC is more than up to the task of providing current to my 470 in my Bomber, but I also don't try to shake the truck free from wedges with my steering. Hell, even the MG959v2 in my Gen7 is perfectly happy running off the stock ESC. Maybe I'm just not hard enough on my trucks.

[MasteroFlego]

I currently run mine off 6v, and so far feel no need to increase it. I am also running a Mamba X.

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[redemon]

Originally Posted by MasteroFlego

I currently run mine off 6v, and so far feel no need to increase it. I am also running a Mamba X.

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You need to pump that number up.

[MasteroFlego]

Originally Posted by redemon

You need to pump that number up.

Lol, I would if my receiver could take it. I'm running off my X's internal BEC. Looking at getting my first non RTR radio, Spektrum DX5C, as all of Spektrum's RXs go up to 9.6v

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[redemon]

The X internal can go to 7.4. Do that
It will be fine

[Digital]

Originally Posted by Digital

Still running great in my sons Wraith w/ Vanquish Ti Steering and Vanquish Steering Knuckles, BEC @ 7.4v, this servo is a beast!

Just wanted to report back this this servo is still running strong!

I ordered a TF2 for my birthday and want to stick with your servo. I'm not sure I'll need the big dog 480oz though. What model are people running in their TF2's?

Thanks!

[Digital]

I'm eyeing this one, maybe run it at 7.4v on a Castle BEC:

360oz-in ProModeler HV digital servo is waterproof, has metal gears, and 2BB