Micro 3.7g Servo GH-S37D Mini Digital Servo for Control Aeromodelling Aircraft Flight Direction RC Plane Helicopter Boat Car 5pcs

Great performance

Bought the box of five... they arrived quickly. I tested all and they all worked. There is a fair amount of difference between them in the sound they make, with some of the gear-trains being quite noisy... but there seems to be no difference in function. Travel was fairly uniform between them, and position repeatability was adequate for what I'm using them for. They are not the "quickest" of servos. These will all be going in sub 250 gram casual fixed wing fliers and in that application these will be just fine. As someone that has been in this hobby for 50+ years, I'm amazed at how far down the price curve RC gear has come.

Great product

One was had motor gears out of the box and would jump teeth. Two were sticky and had too much drag and would not return right. One was ok with slight slop. The last was dead on as it should be. 1/5 worked correctly. Crapshoot.

For those who don't already know, the 3.7g rating refers to the weight of the servo itself with no wires or servo arm. This doesn't make a lot of sense, because you can't use the servo without the wires and servo arm. This is normal for most servos listed as 3.7 grams. My scale put these at 4.96 grams. Very small and compact.

It is a perfect fit for my Mini airplanes and control arms are perfect. Great all around!

They all tested and work. Haven't installed them yet

these servos work great for light rc airplanes.