FLASH HOBBY 1 Pair Servo Micro Analog 1.5g Loading Two Linear Servo

small easy to use fats and can be used with jumper wires

They work. Sort of, but I was not impressed. I bought two sets of these for use in a sub-250-gram RC plane that I’m building. I set out to test them with a 5v power supply and oscilloscope/function generator. The first servo powered up and moved to one end of its travel, but would not respond to the PWM signal. I soon discovered that the control signal wire was under a blob of glue but not actually soldered to the PC board. Strike 1. It worked after I soldered the wire in place but that’s a 25% failure rate had I not figured this out. The PWM signal started to control the servo at about 960 µs of pulse width. But the dead band was more like 50 µs rather than the 5µs stated in the data sheet (if you can call that fuzzy little picture on the Amazon page a “data sheet”). So, the steps are rather coarse. Strike 2. The full control range is about 2100µs as stated. There seems to be some hysteresis built in; applying the 960 µs to get movement started then requires moving the pulse width back to about 910µs to return to the initial starting position. That’s not a bad thing, but goes to the large dead band. The motor got noticeably warm when the servo was actually moving. I wonder what the maximum duty cycle will be? I have doubts about how well this will work my little RC plane, but I’ll give it a try. Size and weight are paramount so I might be willing to accept these limitations. On the other hand, these are expensive compared to normal servos and I would hope for better. Note that these come in pairs of Left and Right servos. The motors are physically located left or right of the worm gear (if you can call it that, it’s just a cheap screw). No matter and maybe good or bad. But I noticed that the two servos moved in opposite directions. That’s not bad and maybe what you want for ailerons. OK. Except of the two pairs, I found that the pairs moved in opposite directions to each other. In other words, the right servo of one pair moved in the opposite direction of the right servo of the other pair. That kind of makes it kind of hard to plan which to use unless you test them individually. Another strike? Next, the servos with their wire and connectors weighed an average of 2.0 grams, not the stated 1.5 grams. Strike 3 (or is it 4?). The data sheet states its weight without the servo horn, which is just stupid because the servo horn is an integral part of the servo. Oh, and the connectors are those little JST 1.25 connectors which are not compatible with a typical receiver. That is obvious from the picture and the “data sheet”, so no dings for that, but I will have to change the connector. One of the crimps on the one of the connector terminals pulled loose while I was handling them. That points to quality control which is overall poor. (see first strike above). In some ways though, I do like the linear rather than the rotary motion of these servos. So, yeah – I’ll make them work, but only because of strict size and weight requirements for this application. Stick with typical 9g micro servos if you possibly can. I will re-evaluate once I get the plane going and possibly look for an alternative. Maybe the 2.5g micro rotary servo would have been a better choice, I might be able to make those work once I determine the total weight of the plane and other components.

Other sellers need to do the same and protect these servos with a box inside the envelope. Both right and left servos came well protected and work fine.

Im building some things and needed some of these. They seem to be ok but my biggest concern is the gear teeth. They seem to be fairly soft and I could see them getting rounded off by just a small amount of tension.

Get out your millimeter measurement device. These are 0.8 inches by 0.5 inches by 0.4 inches and the connector is NOT standard for rc receivers. haven't tested yet but it appears the total length of the drive-bar will be 0.5 inches. I should have read all the other reviews before purchasing, but I still think I can make it work. These are definitely CUTE

These are awesome for adding payload capabilities to small drones.

The connector isn't a standard 0.1" pitch, so had to replace the connector. Then, I found that the servo tends to jitter (narrow or no dead band). Finally, the range of motion is less than expected - only about 1/4 inch.

These things are tiny, and they work. I have yet to build the model I bought these for.

Relative to its range of motion the backlash is big.