Hitec HS-5645MG

Application(s): 50cc and 1.20 Christen Eagles, Dirty Birdy, .60 Stick, A Few Scratches including Combat

Comments: Cry babies! Came lookin for any 7.4V experiences. Not fast enough, maybe you need a solenoid, or pulse system (look that up). Need it stronger, buy quarter scale/gas boat (cheap). They survive my overpowered flutter destructions many times!

Application(s): 25% Inversa 3D plane. All surfaces.

Comments: I have read other comments and they are pretty ignorant. You can 3D with any servo if you know 3D or stunt. Ultra fast will not make much of a difference. I hate reading reviews from fools who don't know enough about servos or Rc Planes

Application(s): Used the HS 5645mg on warplane 101in Tucano . So far they have work great. I would use again.

Comments: So far I would use them again

Application(s): 3d and aerobatics

Comments: I'm not going to bash this servo completely, but it is NOT a good servo for higher performing 3d or aerobatic aircraft. It is true, this servo and the xxxx25mg definitely have centering issues! I used the Hitec programmer, it didn't help. Resolution is poor. These will work quite well in warbirds, larger trainers, or maybe a sport aircraft that's not overly fast. I had 12 of these and sold them all!!!

Application(s): Steering servo Rustler

Comments: Used it in my Rustler for a while as a steering servo until it burned up. I can't fault it though as a rock got lodged in the bellcrank and ended up frying the motor before I could get to the car and turn it off.

I find it a bit too slow for a steering servo in a 1/10 like the Rustler unless you're just bashing, but it's quite noticeably slower than the 7985mg I also have as well.

It's a pretty decent value for around 50 bucks, but I doubt I'd ever get one of these again. For another 30 bucks you could get the 7985 which is just faster, stronger, and keeps my car going straighter. The 5645 developed quite a bit of slop after a while which made it hard to keep it going straight.

Also, Hobbyking has some stuff that rivals the higher end, super fast high torque titanium gear servos like the 1258tg. I'd go with one of those even though it needs a bec with castle stuff.

Application(s): All Velox Feibao surfaces

Comments: Servo is terrific. Have used this one on my Velox Feibao. Sppedy is ok, but you need the programmer to spped this up. Don't want another one :)

Application(s): ailerons

Comments: good: this is a ok servo for sport plane up to 120 size. Lots of power. Low amp draw.
Bad:
a little slow,even on 6v they are slower than my 5495's on 4.8V
Centering issues on mine made ganging 2 per aileron not a option. (yes i tried the programmer)
out of the box there was about 1/8" gear slop using 1"
horns. Dont reccomend for any speed planes. There is built in flutter factor here.
Bought these on advice of a friend. guess i know who not to listen to for the next purchase.