SM-S4408M H/D Servo 8.6kg / .11 sec / 51g

• Overall
• Quality
• Value

Customer Rated

Apr 10, 2013

Its a great servo replacement for my old futaba 9551 which is over price.

Quality of this servo is good.
Its a standard low profile servo good for 1/10 touring car.
Centers well.
Value for money
Will buy it again if HK replenish the stock

• Overall
• Quality
• Value

Customer Rated

Nov 06, 2012

Great low profile servo. Much better than the Bluebird ones. I had to replace some faulty Bluebird servos. It is a great choice. Low noise, strong and no chittering searching for the center.

• Overall
• Quality
• Value

Certified Buyer Rated

Sep 28, 2012

I bought 2 nice working pcs. My project is not finished yet, so no flying data, but it looks like a rigid and quality servo. The dimension and the weight are pretty exact, this a short servo!



Bellow some data on 6Volts:

Max/stall current 2,2A



static load (with acceptable arm movement)

5kg -> 1,2A

6kg -> 1,5A



What I do not like is that at such loads servo won't move but the arm stays steady, trying to move it on opposite direction stalls.



Some data for reference



Turnigy 620DMG:

stall 2,5Amps

5kg 1A

6kg 1,7A



Vigor VSD-18MB

stall 2,5Amps

5kg 1A

6kg 1A

At 4kg load the VSD's arm moves, but has less narrow band compared to the other 2.



P.S. I am not the best bench-tester.