On sale now - limited edition Lee Martin Signature servos. 3 different units. Special black case. Black wire harness, with Lee's signature on each one.

Limited time, get them while you can....

http://i1370.photobucket.com/albums/...ps101384b9.jpg

http://i1370.photobucket.com/albums/...pse4629d77.jpg

http://i1370.photobucket.com/albums/...ps317223b2.jpg

http://i1370.photobucket.com/albums/...psb6723d72.jpg

man that lee martin LP servo looks sexy. Hmm, I do dislike orange.....that might be the way to go :)

Black LP Servo ordered :)

So why do the Lee Martin Servos in the LV version? The HV servos are priced about the same and the ability to go to 8.4 volts is nice. the 6.6 rating is kinda useless in electric, because we dont use LIFe packs

these are F horns right?

Yes - to the tooth count.

As for the LV. Here is the thing about HV and servos. majority of the time, there really is not a need for that much speed and power from the servo.

We have seen a lot of drivers who are having erratic handling, or very twitchy cars - and they are running HV servos or the voltage turned up. Where slowing down the steering would give them control and make driving easier. The more you can turn with the least amount of slip angle (wheels turned), the more efficient your corner speed will be.

Also, as an example so drivers use LiFe batteries for RX packs in nitro cars, those are a lower voltage, so you don't need the HV servos. Still get quality torque and speed.

I got my xpert servo. Comes with the shortest servo lead ever, but it looks nice. I guess you can always use an extension.

I recently purchased Xpert RC PI-3431. So far it is overall a great servo but two things I have noticed. There were two instances the servo did not bind. Turned on radio, turned on car, had throttle response but no steering. Turning off and on again solved the issue. I hope it is nothing more than that. And second, with no load after a run. I would slightly touch my steering controller and the servo would rapidly jitter moving about a millimeter both ways, but when I'm on track its smooth as butter. My friend commented that it is a trait digital servos have. Any others experienced these results?

I have a pm-3401 low profile servo that does the exact same thing, in regards to not operating when the receiver/radio are turned on. When they are switched off then back on it will work. I was curious if it was an actual issue or just some normal thing. It is an excellent servo, works great and once it operates I never have any issues! Just sometimes the initial turn on, no operate until you turn off and back on! Curious as to the cause of this as well, hoping it never goes any further and becomes an issue to get it to operate!

Apologies for not seeing the posts -- don't know how I missed them.

Check and make sure that all the pins are making a solid connection in receiver. It would be on for a unit to not turn on some times unless there was a loose connection. Internally the power wires are not only soldered on the board, they are then epoxy covered to make sure that there is not chance they come off -- or modified in any way.

If you took off the plug to shrink wrap the wire or something also check that the pin is all the way down and locked into the plug. Again to help make sure that connects. Finally, keep an eye on your radio. I have a 4pks and sometimes it goes into C1 mode and my receivers are C2, so I have to turn it off and back on.

I'm pretty sure it's not a pin/connection issue, in that the servo only does it on initial power up. I would think that if it was a pin/connection issue the servo would at least occasionally stop working while the car is actually running, especially being that it would be getting jarred around. Also just to be clear, I only need to turn off the receiver and then back on, not the radio. Sorry about my previous post, I gave the impression of both but only meant the receiver. I would have to say it has only done this maybe 10 times since I have had it, out of say 70 runs, just a guestimate! I was also trying to remember if there was ever a time that shutting it off then back on did not work and whether I had to repeat it more than once to get it to work. Unfortunately I can't remember for sure, but it seems just the one shut off/on has always seemed to work. Like I said though, once it operates, absolutely no issues at all, works flawlessly after initial power up!

Also On a side note, It also seems that the servo is getting power! on one occasion when it did this, first few times it initially did this, I felt and put my ear up to the servo when it wouldn't operate, I felt/heard a slight hum. I don't remember if I checked to see if the servo had any resistance to move by hand or not! The next time it does it I will check to see if it resists to move.

^^ Agreed. I've come to a point now to check my steering before laying it down the track. Other than the initial issues this servo is flawless.

First, you guys are certainly open to send them back to be tested. It's strange that it only happens so rarely. If it was a power or processing problem, thought would be it would also happen when unit was being used under load. If it happens again try to notice if the light for your receiver is on and/or speed control is working. To verify you receiver is armed and getting the signal from he transmitter.

The receiver is deffinately working, because I still have throttle when it does this, just no response from the servo! I ran the car 10 times yesterday, not one single occurance. I'll keep a closer eye on it, when it does it again, I will check for the hum and whether or not the servo resists being moved. I will also keep an eye on whether or not I have to turn the receiver on more than once on different occasions. I am not overly concerned at this point, like izzyracer said earlier, I have also had it initially do this to me as i was heading up to the drivers stand, and of course no steering, so I had to head back down to see what the issue was. Now I just turn the car on and the radio and check to see if it steers right before the race and just turn off the radio and leave the car on. I have another spare servo, same low profile just without the aluminum case, but I am not using this one at this time, thought about swapping them to see if this one does the same thing.

Also one other thing I forgot to notice is whether or not the servo did its Beep, Beep chime sequence when it does this! I don't remember if it did it's audible tone or not, but I will also get in the habit of listening for it when the issue occurs.

Its an audible tone when it starts up. Pretty strange that its the one thing that didn't start up, just that one time. Weird, haven't had that happen in 7-8 months of using the 3 I have.

I love this servo in my TC. Short wire and all. Unfortunately its always out of stock to buy more.

I just noticed the other day that there was an extra noise coming from my car when I turned it on. Thought it was the esc making a new noise. So its the servo you say. Hmmmmm

yeah, the servo chimes and dings at startup

hi,

i consider buying si-4431 servo. it has good enough speed and torque. it is cheap and brushless. But, i wanna know warranty duration. Because, i am not living in USA. Also, Any feedback about servos performance would be appretiated.

i checked xpert usa website and find that those servos have 1 year limited warranty. it was not mentioned in this thread. Now, it is.

Btw, i decided to buy si-4431. Lets see how it goes. It is perfect time to buy it this month due to amain's september discounts. You can buy xpert si-4431 at 65 dollars.

Yeah, the warranty is 1 year against any mfg defects. Gears are not covered, each unit is tested before it leaves to make sure the gear train is smooth. If it gear chips or breaks after that is was due to an outside force.

Yep -- pretty cool!! :cool::blush:

Could you explain what the difference is? I have always wondered but never thought to ask.
Thanks,
Mark

Mark, it comes down to the construction style of the motor. A coreless motor is the highest evolution of brushed motors. As a motor itself, they have good spin up qualities, and are fairly inexpensive to produce. Brushless are essentially like we use in our cars. They will be more efficient in operation and when used correctly with software (a servo is really a motor, speed control and some gears), able to more precise in operation.

Biggest issue with brushless servos in the past have been price. And we have worked hard with Xpert to bring the price down to almost that of a coreless unit, but with all the advantages of efficiency and control you get from brushless. We don't see the big spikes that can effect BEC, and brown out a receiver. They are very efficient so not taking any extra voltage from the battery.

it looks good~

Has anyone fitted one of these in the associated B5. The standard servos look kind of tall and low profile will not work in the B5.

They both fit in a B5, we have had customers mount them both in B5's. What type of issue did you have that one of the low profile units didn't fit??

I see a line of waterproof ones on the way:

WR-4401-LV

204.31 oz-in and .106 sec/60* at 4.8v
255.39 oz-in and .085 sec/60* at 6v
280.93 oz-in and .077 sec/60* at6.6v

WR-6601-HV

257.75 oz-in and .154 sec/60* at 6v
317.99 oz-in and .125 sec/60* at 7.4v
360.88 oz-in and .118 sec/60* at 8.4v

WR-7701-HV

307.3 oz-in and .196 sec/60* at 6v
379.06 oz-in and .158 sec/60* at 7.4v
485.8 oz-in and .126 sec/60* at 8.4v

which of these servos are made to be used in 1/10 and 1/8 vehicles? (the original post I saw mentioned 1/5 and I don't see these on the website)

Right now I use Hitec branded servos, but I am looking for ones that are waterproof but have specs that are similar to what I have already in the 300+ oz torque range sub .13 transit, as well as 400+ range.

Do you have any specs on what these rate at with the max VTX8 BEC voltage at 8V?

Got my SI-4431 servo. Used it at 6.0v. Speed is amazing and torque is good enough for my xray xt8 truggy. Here is the link of my first try of the servo. Worth the money.
https://www.youtube.com/watch?v=uVmUtd14p2w

murat61 - nice video. Good Luck, I have used my SI-4431 many times in 1/8 this summer. In fact one of our team drivers used my car at a big event in Canada, TQ'd one round and was on pace to challenge for the win until some other screws came loose (mechanic has been fired).

Cain -- the 7701 series servos have been tested in 1/5 vehicles. Depending on what chassis you run, you may need to purchase mounting plates for standard size servos, but they are available.

And these WR series unit are designed so that they can fully be submerged in water -- check out the video on Xpert Facebook page for more.

Good stuff. looking forward to reading more on them once they are listed on the website.

Look I found the thread, Nike one more servo question here, would I be better off with a high voltage servo compared to a LV servo. I'm no electrical engineer but when you run a higher voltage doesn't that mean less amp draw which should equate to less heat which we all know is good for electronics. So if I would turn my bec up to 7.4 volts on the vtx8 would that be better than running it at 6v. Unless there is something different with servos. Thanks

Any idea when the waterproof servos will be hitting the dealers' shelves? The WR 7701 needs to be in my SCX10.

:tire:very professional

Information has been posted -

http://www.xpert-rc-us.com/category-s/1840.htm

http://www.shopviperrc.com/searchresults.asp?cat=1925

In stock now -- dealers just have to order them. Or you can find a link for them... :blush:

Is marc still running these servos, or he went full sanwa?

I'm thinking about getting one of these to try, since i prefer to run a LiFe in 1/10 200, and these have good specification for 6.6v.

I've been using Xpert since August. I am overall happy with it. I recently had a chance to make a decision again on what servo to get and I was going to switch to sanwa thinking it would benefit me since I use all Airtronics on my radio, receiver and even the new esc. But to my surprise it was still slower than my expert. I also tried savox and it looks like almost as fast as expert but the torque rating was less and the size was standard not low profile so Xpert still won for me. Here's a video I made Slow-mo at 120fps. (Sanwa rating was only .09 sec vs .07 on others. But I could not find from sanwa that's faster.)

+ YouTube Video

http://youtu.be/R58bNz5Kj68

did amain order some of these?

was kind of funny when checking delivery options that the xpert usa option for free shipping wants me to order 1 Cent more to get it lol.

Viper at least doesn't :)