Power HD B5 HV servo

[DavidB1126]

Super nice servo

 

[Jerold]

Looks pretty fast and comes in a fancy case too.

Let us know if it's any good.

 

[332_RC]

Super nice servo

Love my Power HD servos. All my rigs have em. I put a GTS-5 Pro (low profile) in my Talion. I save all the fancy cases too

 

[ahr43]

Don't know much about HV servos. So far, tended to stay clear of them. I have noticed that most of the ESCs I'm using now have the option to switch to a higher voltage BEC. So, there must be a market demand for them.

What is the advantage of providing the servo a higher operating voltage off the BEC? Is it applicable to all RC applications, or limited to specific activities (bashing, crawling, racing, etc.) or scales? -AC

 

[332_RC]

HV means they can be run at 8.4v for more torque & transit speed if the ESC has 8.4v option. Alot of servos have 6.0v & 7.4v only options. Heavy rigs, bashers, & crawlers benefit from a HV if the ESC has 8.4v.

 

[ahr43]

Thanks, 332. Notice the servo David is showing has a torque rating of 277in at 8.4V. Running it at, say the 7.4v HV option reduces the torque rating to ~250in, give or take? 7.4v is the highest option I've seen on my ESCs.

What is the trade off? More power battery voltage bleed-off to operate the servo? Resulting in less run time? Or is it even noticeable? If there is a voltage sag in the battery under acceleration? Is a 8.4v HV servo more likely to glitch than a servo powered at 6.0 or 7.4v? Is using a 'glitch-buster' to minimize voltage sag at the servo advisable under HV use? -AC

 

[332_RC]

Thanks, 332. Notice the servo David is showing has a torque rating of 277in at 8.4V. Running it at, say the 7.4v HV option reduces the torque rating to ~250in, give or take? 7.4v is the highest option I've seen on my ESCs.

What is the trade off? More power battery voltage bleed-off to operate the servo? Resulting in less run time? Or is it even noticeable? If there is a voltage sag in the battery under acceleration? Is a 8.4v HV servo more likely to glitch than a servo powered at 6.0 or 7.4v? Is using a 'glitch-buster' to minimize voltage sag at the servo advisable under HV use? -AC

Haven't noticed any difference using 8.4v. I haven't used glitch busters. I have a couple of them. They do keep the ESC from browning out under high BEC loads.

 

[ahr43]

My battery power is primarily 2s with 100-130C ratings. Do have one 3s in the inventory. Running 2s with a high C-rating tends to hold the voltage well dropping to ~7.9 to 8.0v for my sessions. Sticking with a standard-v 6.0v servo or, at most a 7.4v is the better option for me. On 3s, might be able to power up an 8.4v if an ESC has that option.

For my purposes, thinking a HV servo and ESC with 8.4v BEC is more useful with battery packs 4s-8s range? Is that correct thinking? Thanks for the good useful info. I'm smarter on HV servos now. -AC

 

[332_RC]

Yes, I'm running 8.4v on a 200amp ESC, 6s. Also on a 160a ESC, 6s. Really no need in a lighter 3s rig for 8.4v. Most the HV I've seen are above 25kg, except for David's servo above at 20kg but has a extremely fast transit speed at 8.4v, which may be a reason for a HV 8.4v servo in a lighter RC, for quicker more precise steering, needing less user input.

 

[DavidB1126]

Yea for lightweight 2wd buggy they say you want the speed. And I agree with that. My 25kg cheap hexfly servo has the torque but not the speed and it has too much resistance for high grip tracks. Past 2 races I had a tough time re-entering the car when landing. Servo should fix that. And like 2 weeks of practice

 

[DavidB1126]

With the HV part, I usually just leave my stuff on the standard 6v. But this servo was recommended and having the HV part is useful when if I want to go to HV in the future. My servo in my wheeler is only a max of 6.6v but is super torquey but speedy as well

 

[332_RC]

You'll be pleased with the Power HD. Brushless & digital make a big difference.

 

[RustyUs]

Servo Gear Sets

I've never owned any Power HD servos, but I did, and still do, have a couple of them on wish lists, because of their good reputation. I don't believe in disposable servos. The servos in my wish list all have spare gear sets available for purchase should the need arise. I could do the homework; get on the interwebs and look for myself, but that's too easy.

Does the Power HD B5S have spare gear sets available?

 

[DavidB1126]

Does the Power HD B5S have spare gear sets available?

Only thing I found with a quick search.
https://www.ebay.com/itm/3862128246...-89t1-ptJRyVxuTxRvd_LB3CFQ-e9Xqhxu1Kmcs&gQT=2

 

[DavidB1126]

 

[332_RC]

View attachment 216748

That's quick! Power HD! You won't have to wait on the servo to get on the power out of the corner.

 

[Jerold]

Thanks, 332. Notice the servo David is showing has a torque rating of 277in at 8.4V. Running it at, say the 7.4v HV option reduces the torque rating to ~250in, give or take? 7.4v is the highest option I've seen on my ESCs.

What is the trade off? More power battery voltage bleed-off to operate the servo? Resulting in less run time? Or is it even noticeable? If there is a voltage sag in the battery under acceleration? Is a 8.4v HV servo more likely to glitch than a servo powered at 6.0 or 7.4v? Is using a 'glitch-buster' to minimize voltage sag at the servo advisable under HV use? -AC

I doubt you would notice any difference in runtime or performance. If you do, there is a problem. The internal BECs have a current limit of something like like 2A-4A and the actual difference in power is minimal by bumping the voltage.

If it's 4A and you go from 6V -8.4V you will use a bit less than 10W increase, sporadically. It's only the difference in power at 6.0V (24W) and power at 8.4V (33.6W). The 33.6W max isn't constant it's only when the servo is under the max load, which is almost never.

If you have very light car and run small 2S batteries 6.0V might be the right choice. If you have an 18lb 8S Kraton, get an external 20A BEC and crank it up. But if you increase the voltage make sure the other components can handle it - Receivers have voltage input limits.

 

[RustyUs]

My battery power is primarily 2s with 100-130C ratings. Do have one 3s in the inventory. Running 2s with a high C-rating tends to hold the voltage well dropping to ~7.9 to 8.0v for my sessions. Sticking with a standard-v 6.0v servo or, at most a 7.4v is the better option for me. On 3s, might be able to power up an 8.4v if an ESC has that option.

For my purposes, thinking a HV servo and ESC with 8.4v BEC is more useful with battery packs 4s-8s range? Is that correct thinking? Thanks for the good useful info. I'm smarter on HV servos now. -AC

I don't know when high voltage (HV) servos came to be, but I'm sure servos with maximum speed/torque values sell better. Not everyone is going to think about their ESC's BEC output when making that next servo purchase. Those in the know... know.

 

[Jerold]

My battery power is primarily 2s with 100-130C ratings. Do have one 3s in the inventory. Running 2s with a high C-rating tends to hold the voltage well dropping to ~7.9 to 8.0v for my sessions. Sticking with a standard-v 6.0v servo or, at most a 7.4v is the better option for me. On 3s, might be able to power up an 8.4v if an ESC has that option.

For my purposes, thinking a HV servo and ESC with 8.4v BEC is more useful with battery packs 4s-8s range? Is that correct thinking? Thanks for the good useful info. I'm smarter on HV servos now. -AC

The C-Rating won't make a difference for servos. The max current requirement is nothing compared to the motor. If you are running 2S it's likely you will be limited 7.4V. I run 8.4V on my Crawlers on 3S.

I don't know when high voltage (HV) servos came to be, but I'm sure servos with maximum speed/torque values sell better. Not everyone is going to think about their ESC's BEC output when making that next servo purchase. Those in the know... know.

I think they came around when the rigs got bigger and heavier.

Something to keep in mind is the voltage and the current from the BEC. Even if the voltage is higher, the max current of the HV servos often exceeds the internal BEC max current output. So it doesn't help that much because the BEC will brown out.

If anyone wants to run monster servos they consider puting in an external BEC.

 

[RustyUs]

Only thing I found with a quick search.
https://www.ebay.com/itm/3862128246...-89t1-ptJRyVxuTxRvd_LB3CFQ-e9Xqhxu1Kmcs&gQT=2

Without opening up the servo; seeing what's inside... those B5 servo gears might work. I'm not going to dig to find out what the differences are between the B5 and B5S servos. I'm sure you won't need a spare gear set for years. Keep 'em bookmarked, I guess. Go give 'em racin' fellers heck!

And get that servo horn/steering link thing worked out.