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!!

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.

very professional