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12-07-2017 04:59 PM  10 months agoPost 1
wjvail

rrKey Veteran

Meridian, Mississippi

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https://www.ebay.com/itm/BRUSHLESS-...5.c100005.m1851

https://www.amazon.com/EVO-P2-Digit...e/dp/B01MS9RV0V

Has anyone tried EVO-P2 Servo's? I've seen these popping up lately and they look good- on paper. In fact, they fall deeply into the - "If it looks too good to be true, it probably is", category.

At 55 bucks a pop I was considering buying a few and giving them a try. The specifications are very near MKS or XPert specs but that doesn't mean much if they aren't reliable.

Before I start spending money I thought I'd ask here... Any thoughts?

Bill

"Well, Nothing bad can happen now."

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12-10-2017 01:14 PM  10 months agoPost 2
wjvail

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Meridian, Mississippi

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Yea. I didn't expect to get a lot of response on this one.

Watch at YouTube

"Well, Nothing bad can happen now."

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12-10-2017 02:04 PM  10 months agoPost 3
Pistol Pete

rrProfessor

Seffner, FL

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Here? Not much.

Start with heli flyers is a small group followed by the mayority age group behind it plus trump it with brand loyalty and anything else is usually frown upon with "why risk it?"

You will get most likely get more reviews elsewhere but unfortunately not for heli application.

Just posting to throw you a white towel

Damn 36F in Tampa Bay not even the bird are chirping.

~~Enjoying the hobby one flight at a time~~

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12-10-2017 04:15 PM  10 months agoPost 4
Dyehard

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Cedar Bluff, Va.

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It's probably like asking about Rotorstar servos, not likely to get much response about them. They are priced where they seem even more likely to be too good to be true, but the set I have in a Raptor 50 Titan seen to be working pretty good so far.

Allen Dye

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12-10-2017 05:14 PM  10 months agoPost 5
Dr.Ben

rrMaster

Richmond, VA, USA

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Bill,

Here is how this works for a lot of the third party servo providers who do not OEM their servos. There are several servo mfg's in Asia that kinda operate like a servo buffet. They have basic servo designs from which to choose, and then you the seller can decide on the spec and quality of things like motors and so forth. They likely have precanned options as well. You could have "Bill Vail" servos is you want to write Servo King a check. Now, to an extent, the price for which these servos sell is based on ingredient cost, but beyond that it come done to how much tiering there is in the sales network. I am sure that Bert had to carefully run the numbers for the servos he has made for him to allow him to make enough as importer and then for his dealers to make money too.

Some of these third party servos are just fine reliability-wise. Guys get lots of flight on them. Reliability is not the same as performance, and speed and torque are NOT all that make a good servo in spite of what the ads want you to believe. I also look at things like resolution, current consumption, and propensity for EMF issues. I will not beat a drum for one company versus another, but these details do matter for some people, so choose how you spend your money wisely. And always remember that with a typical ccpm model, if one cyclic servo fails, the model is going to crash. Maybe bad. God forbid hurt someone too in the process. At that point whatever was saved on the price of that servo is pretty much meaningless.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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12-11-2017 12:20 AM  10 months agoPost 6
wjvail

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Meridian, Mississippi

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Hey Ben,

Thanks for the reply...

I could note that this year I've bought 4 sets of servos for helicopters totaling approximately $3,200. As a generality, I don't buy cheap components I can't trust.

With the above said, I have two largish fixed wing aircraft that need new servos. I would like to replace them with high voltage, brushless servos. The two aircraft require a total of 13 servos. Going with servos of a name brand could end up costing $2,000 or more. The servos I asked about in the subject line offer, 400+ in*oz of torque and .05 speed. They advertise made in Japan motor and potentiometers, CNC case, stainless gears, etc etc. All for $55 USD, shipped.

If these came from the smorgasbord you noted, how is a modeler to discern these servos from $150 BKs, $200 MKSs or $250 Futabas? You noted that there are other questions to be asked and answered beyond speed and torque. I understand that. But because I know little about any servo I buy, how do I know a re-seller didn't spec firmware from the buffet that will meet my needs?

As you know, some servo suppliers not only allow you to see many of the otherwise hidden specifications, they allow you to change them. While that says volumes about that supplier, it says nothing about the servos that are the topic of this thread.

In the end I see three choices:
-- Go with name brand, known-good servos - potentially expensive.
-- Solicit opinions from other modelers about unknown servos - potentially a dead-end.
-- Buy some, try some, and report what you learn - potentially expensive and a dead-end.

"Well, Nothing bad can happen now."

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12-11-2017 05:40 PM  10 months agoPost 7
Four Stroker

rrElite Veteran

Atlanta

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That about sums it up. I have never paid more than $100 but if I live much longer I guess I will. Tail servos excluded - I have paid near $200. You could cut out the middle man and go RC Japan with no service or warranty.

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12-12-2017 01:16 AM  10 months agoPost 8
EEngineer

rrProfessor

TX

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I lean towards #1...#2 can be dubious, depending....

Roll your dice.....

Logo 600SXs, 800XX, TDR IIs

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12-13-2017 11:50 PM  10 months agoPost 9
wjvail

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Meridian, Mississippi

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I have chosen path one, two and three. Why make a decision when you don't have to?

-- I received a new set of upper end servos this week for models that I care about or particularly scare me.

-- I have solicited opinions here on EVO P2 servos. What does it cost to ask right?

-- Having gotten no feedback (positive or negative) in option #2, I ordered 4 EVO P2s for my own evaluation.

My test of the new EVO servos will be imperfect at best. My large(ish) Stick will be the test-bed. I'd like to have 7 of them for my stick so that I can run them unregulated on 2S LiIon batteries. As it is, I ordered 4 of them for installation in the wing. (The wing currently has Futaba 9252s installed but they have become so jittery they are really beginning to worry me.) The problem with my plan is that I will have to run a regulator for the 3 remaining servos or use a 4 cell NiMh pack. The EVO servos are described as having very large current draw and that could be a problem.

Watch at YouTube

The engines has been changed since the above video... If anyone cares.

"Well, Nothing bad can happen now."

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12-16-2017 10:33 PM  10 months agoPost 10
wjvail

rrKey Veteran

Meridian, Mississippi

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As I mentioned in the above post, I ordered 4 of the servos that are the subject of this thread.

We are off to a good start. I ordered the servos from eBay Tuesday at 6:30am. 90 minutes latter I received notification of their shipment. Today, Saturday, the servos arrived in good condition. 5 days to receive... very nice. Shipping was included in the $54 price.

Attached are a few photos. As I mentioned, I don't have the equipment to properly test these servos. As others have pointed out, the details can make all the difference and I will be unable to report specific numbers.

I will do what testing I can and install them for flight testing. They will not be installed in a eCCPM helicopter - at least not until I have flown them in something less critical.

Comments welcome.

"Well, Nothing bad can happen now."

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12-17-2017 12:41 AM  10 months agoPost 11
jbjones

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Columbus, Mississippi

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Testing
Thanks for the update, Bill. I'll be looking forward to your results.

J. B. Jones

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12-17-2017 04:35 PM  10 months agoPost 12
Pistol Pete

rrProfessor

Seffner, FL

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Dr.Ben
Reliability is not the same as performance, and speed and torque are NOT all that make a good servo in spite of what the ads want you to believe. I also look at things like resolution, current consumption, and propensity for EMF issues.
Thanks for posting the servo industry info. Pretty much as suspected

Reliabilty is what pretty much started this thread.

You would think that making resolution and current consumption info available to the consumer would be a great marketing move.

Sorry to say that the odds of coming across the servo diagrams to verify if a "diode" is used to prevent EMF is absolutely null. I'm confident that at this stage in the servo buffet industry it's pretty much a given.

* * * * *

Waiting on someone to post and say..."hey, those servo are exactly like (_?_)"

Great move on opening to inspect and thanks for sharing.

~~Enjoying the hobby one flight at a time~~

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12-17-2017 06:25 PM  10 months agoPost 13
wjvail

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Meridian, Mississippi

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I powered up my servos yesterday. I have a "test" rig I use for these purposes. It consist of a Futaba receiver, a switch and a 4 cell NiMh battery. Because I had not use this setup for a bit, the 4c NiMh battery was showing 4.5 volts. Typically that would be sufficient for testing. In this case 4.5 volts was not enough to power these servos -at all. We all expect torque and speed to decline as voltage drops. In this case 4.5 volts resulted in 0.0 in both torque and speed. The servos simply didn't move. In fact, I could rotate the servo arm with my fingers.

It caught me off guard. My first impression was that the servos were DOA. It is very possible that all HV servos respond in the same way. I've never experimented with HV servos at less than 5 volts. Anyway, charging the pack to 6.0 volts had the servos moving.

The good news is that the Futaba receiver never lost link even though the servos were functionally stalled. Even with 4 servos attached with insufficient voltage to function, the RX never lost link.

I may have to convert my airplane to a 5 cell NiMh system or buy 3 more servos and convert the entire airplane to an unregulated 2S 8.4 volt LiIon system. In any event I need to make certain that voltage to the servos doesn't drop too low - apparently they quit functioning entirely.

Going on... I have carefully studied the photos I took yesterday. What should I think of the circled signal wire? Almost certainly the wire was soldered to the board from the opposite side. Further, I've never inspected other servos this carefully. Many other servos may appear the same. Still, I find this unnerving...

"Well, Nothing bad can happen now."

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12-17-2017 09:14 PM  10 months agoPost 14
wjvail

rrKey Veteran

Meridian, Mississippi

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Alright. This just got a lot easier.

I was worried about the solder joint on the signal wire pictured in the last post. That prompted me to inspect the other three servos. It didn't take long to figure out these aren't even the same servo! I opened them up looking for bad solder joints and freebees and found a lot more than I expected.

At this moment I'm unsure how to proceed. At this moment I would not recommend them for a helicopter. I'm unsure if a trust them in a plane. I don't need car/truck servos. If I confess I opened them it's unlikely they will except them for refund (I'm not sure I would either). I suppose I could simply say they were bought in error or received as an unwanted gift but I don't sleep well with those sorts of lies.

Finally, I could install them in my son's old PT-40 trainer and see how they work. Do trainers need 400 in*oz of torque and HV servos?

Learn what you can from my efforts. I'll report when I have more.

"Well, Nothing bad can happen now."

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12-17-2017 09:19 PM  10 months agoPost 15
JuanRodriguez

rrProfessor

The Villages, Florida

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Do all 4 show the same questionable condition?? I would wick a little solder on that connection for sure .....

Been there, done that and old enough to know better.....

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12-17-2017 09:37 PM  10 months agoPost 16
wjvail

rrKey Veteran

Meridian, Mississippi

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Notice the layout of the IC chips isn't even similar.

Using Ben's analogy of a buffet for servos, I'm not sure these even came from the same restaurant.

"Well, Nothing bad can happen now."

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12-18-2017 06:19 AM  10 months agoPost 17
Pistol Pete

rrProfessor

Seffner, FL

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Unless it has a seal or there was any wording implying warranty (if any) is void if you opened them, then I dont see an issue. Of course, if you cause any damage when opening, then that's on you.

If anything, those photos are proof of the reason why you are returning them. Specially if purchased with paypal. If ordered via amazon, they will take them back, no problem. If via ebay, many vendors strive for a 5 star rating.

Im curious why you didnt test them with a 2S voltage?

As for differences, perhaps you got an older an newer version but still doesnt excuse the lack of such information in description.

So bottom line...Reason for return is not as described.

~~Enjoying the hobby one flight at a time~~

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12-19-2017 08:43 AM  10 months agoPost 18
wjvail

rrKey Veteran

Meridian, Mississippi

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Im curious why you didnt test them with a 2S voltage?
I just haven't taken the time to check if the receiver I pulled out for testing these is HV capable. That's all. I'll get around to it shortly.

And apparently I have more time to consider these than I expected. I requested a return through eBay. The response was: "This return was closed. This return was completed on Dec 18, 2017. The seller declined the return request" Any further discussion through eBay seems to be a dead end. I suppose I can pursue a return through PayPal. I will also contact the seller and see if he really wants the poor feedback he might receive.

It's been entertaining and educational.

"Well, Nothing bad can happen now."

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12-19-2017 01:30 PM  10 months agoPost 19
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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Thanks for posting pictures. I agree the soldering looks sketchy at best . I would have to rework the entire board just to have a little of confidence in them.

I would return them of you can

spending time, paying attention

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12-19-2017 02:24 PM  10 months agoPost 20
jbjones

rrVeteran

Columbus, Mississippi

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wjvail
The response was: "This return was closed. This return was completed on Dec 18, 2017. The seller declined the return request"
Damn, bummer. Yeah, I think that warrants some negative feedback.

J. B. Jones

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