MattySlimz1987
Rock Crawler
Looks like the whole back shaft with all three gears needs to come up a bit..
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What the newest cheap servo hotness?
- Thread starter Duuuuuuuude
- Start date
spaceman5280
Quarry Creeper
It's possible that I'm not driving my rigs to their potential, but I have only had two servos fail, one on a slash 4x4 after 4 years of pure abuse and one in my Arrma Senton that was replaced under warranty.
Note that I have three step sons who drive my rigs as well....
I still run the JR servo I bought with my first generation AX10 that I converted to an SCX-10.
I have a solar d772 in my Ascender, power HD WP 20kg in my HG P402 and MST CMX. I have one from Hobby People in my EXO, a low profile Solar in my TT02, I put the stock Ascender servo in my TF2.
My MST CFX has a Spektrum S6230 cuz I needed low profile and the Solar was sold out.
My plan is to start cheap and upgrade as needed, if I were having the same failure multiple times, I would start by verifying by there are no mechanical, electrical problems and then see if I need to modify my driving style before upgrading.
Sent from my iPhone using Tapatalk
Note that I have three step sons who drive my rigs as well....
I still run the JR servo I bought with my first generation AX10 that I converted to an SCX-10.
I have a solar d772 in my Ascender, power HD WP 20kg in my HG P402 and MST CMX. I have one from Hobby People in my EXO, a low profile Solar in my TT02, I put the stock Ascender servo in my TF2.
My MST CFX has a Spektrum S6230 cuz I needed low profile and the Solar was sold out.
My plan is to start cheap and upgrade as needed, if I were having the same failure multiple times, I would start by verifying by there are no mechanical, electrical problems and then see if I need to modify my driving style before upgrading.
Sent from my iPhone using Tapatalk
84yoda
I wanna be Dave
Just the right gear needs to come up ~0.30mm. I only have a 2x4.70x0.75mm washer on hand but 0.75mm is way to thick and just locked up the gears. I need to find more 2mm washers.
magic_yeti
RCC Addict
Just got a notification that Hobbyking listet a new servo manufaturer JX
https://hobbyking.com/en_us/catalog/category/view/s/jx-servo/id/7412
the specs and prices are looking promising, they have a series which can run direct from 3s and has a separate power connector.
anyone knows these?
https://hobbyking.com/en_us/catalog/category/view/s/jx-servo/id/7412
the specs and prices are looking promising, they have a series which can run direct from 3s and has a separate power connector.
anyone knows these?
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TheLetterJ
RCC Addict
I like the seperate power connector. One of them is rated to 15v, with 47kg (at 14.1v) I'd probably be pushing it to run that on a fully charged 4s huh? I am intrigued, not so much because of the torque, more the voltage rating. I'd hate to fry $70 experimenting with 4s, 3s would be safe, but I'd have to run a BEC anyway at that point so it looses some of its appeal for my application.
TheLetterJ
RCC Addict
I had a Promodeler 420v3 in my last Wraith, nothing bad to say about it. I also have a promodeler 215 (?) in my Baja Rey. Neither of them can be run directly off 3s, let alone 4s, and if you've ever had an external BEC fail, you'll know why running directly off the battery is appealing. Factor in the required (or at least STRONGLY suggested) Castle BEC and you'll be $20 further away from the price of these high voltage servos. Simpler wiring too. There aren't too many servos out there rated at that high of a voltage, and none (that I've come across, with remotely similar specs) that are near the price of the JX brand.
84yoda
I wanna be Dave
While the idea of no bec sounds good, I just don't like how you lose servo power as the battery runs down.
Thinking out loud here.
But, can a BEC actually UP the voltage to a higher level than the battery pack is? I don't think it can? e.g. if the battery pack has dropped to 7volts, can the BEC still somehow supply 8v?
If it cant, then that would mean that running it straight off the battery - the voltage can only ever be higher, or equal to what the BEC can supply?
e.g. battery starts out at 12v or whatever, drops down to the minimum battery voltage near the end of the pack. Surley the minimum pack voltage must be the same or higher than what the BEC can supply?
Maybe a BEC can regulate the voltage upwards, and im not aware of it?
If it cant, then even though the servo looses power as the battery runs down, its still going to be at a higher or equal voltage to the BEC.
edit; if im correct; the BEC would give you equal or less power at all times compared to straight off the battery, the only positive I can see is that the torque would remain constant with the bec. Less than the max that is possible straight off the battery - but consistent.
I think it would be smart to consider the minimum torque in both situations. The BEC is always going to supply the minimum/ what the voltage is set at. Straight off the battery pack, it will start out higher and gradually end up about the same place as with the BEC installed. It cant go lower straight off the battery pack as compared to the BEC ( i think?)
I spose the choices are - Start with more torque, then slowly have it taper down to the same level as with the BEC installed. (straight off battery)
Or run the BEC, have torque consistent but it will be at the lower end of whats available, with torque more comparable to how it would be with the almost flat battery pack.
All this is assuming that a BEC cant regulate the voltage UPWARDS. Maybe they can. I dont know.
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mikemcE
I wanna be Dave
I know what I get at 7.4 volts, thru my bec. I've learned to purchase sufficient torque and speed .
I used to spend less and have less torque and more failures. If you need 350, buy 400.
Because a bec is a voltage regulator , not a transformer.
Hang up and Drive
I used to spend less and have less torque and more failures. If you need 350, buy 400.
Because a bec is a voltage regulator , not a transformer.
Hang up and Drive
I just mean that say the BEC is set to 7.4v, that's all the servo will get.
If we are running a servo straight off a 3S lipo, then 12.6v will be our max voltage, and 11.1 should be the minimum the servo will see.
Either way, even with gradual power loss due to battery voltage run down - its still going to be substantilly more power (at all times) than running the BEC @ 7.4v.
You could confidently know what you get straight off the battery as well. A minimum of 11.1v, which should be substantially more power then via the BEC.
Im only thinking out loud. I dont have anything that runs straight off the battery, nor am I looking to get one. ( I just ordered a savox 2290 so I think im good as far as servo goes)
I just think avoiding wiring it straight to the battery, due to gradually loosing power is backwards economics.
Basically as far as I can see- Minimum power direct from battery > (is greater than) Max power via BEC. So avoiding wiring direct to battery due to "loosing power" seems counter productive. Even with max power loss its still going to be more powerful than via BEC.
If we are running a servo straight off a 3S lipo, then 12.6v will be our max voltage, and 11.1 should be the minimum the servo will see.
Either way, even with gradual power loss due to battery voltage run down - its still going to be substantilly more power (at all times) than running the BEC @ 7.4v.
You could confidently know what you get straight off the battery as well. A minimum of 11.1v, which should be substantially more power then via the BEC.
Im only thinking out loud. I dont have anything that runs straight off the battery, nor am I looking to get one. ( I just ordered a savox 2290 so I think im good as far as servo goes)
I just think avoiding wiring it straight to the battery, due to gradually loosing power is backwards economics.
Basically as far as I can see- Minimum power direct from battery > (is greater than) Max power via BEC. So avoiding wiring direct to battery due to "loosing power" seems counter productive. Even with max power loss its still going to be more powerful than via BEC.
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mikemcE
I wanna be Dave
I'm not aware of many 12 or 14v capable servos 8.4 seems to be the norm. JRH said something about chips, I don't remember
Hang up and Drive
Hang up and Drive
I was thinking about the HH servos when I wrote that. Not exactly budget as this thread is about. But the HH servos were the reason for my thinking out loud in regards voltage off BEC vs direct from battery.
Did not look @ what voltage the ones mentioned above can run.
mikemcE
I wanna be Dave
Holmes HV500 can run off 3s but not 4s as it's rated to 14.1v....but that's $$ , granted no bec cost
Hang up and Drive
Hang up and Drive
mikemcE
I wanna be Dave
Just talked with John, looks like a couple more weeks, I'm in the loop(or loopy)
Hang up and Drive
Hang up and Drive
So many people are breaking pins on the Holmes HV500 servo. Plus, that's kinda far away from the topic of "cheap servo hotness". :lmao:
mikemcE
I wanna be Dave
My thought is no cheap 400oz servo that will last
Hang up and Drive
Hang up and Drive
Last how long? If I buy a $25 servo and it lasts one year I did good. It would take me 4 years to get to $100. Lots of high priced servos don't last 4 years when you beat on them.
