No, it won't work.
That's a full size servo, and you need a micro servo.
You can tell because the HS-300 has four mounting holes, two on each side
. A micro servo only has two mounting holes, one on each side.
Here are some servos that are commonly used:
Volz Micro-Maxx "X" or "XP"
Multiplex Micro BB Digi
Basically, you need something about 1.2" by 0.5" by 1.2" or smaller with at least 30 oz/in of torque.
The most popular choice seem to be HS-85BBs for the cyclic and an HS-81 for the tail.
Adding to Toshi's info, wieght is also critical for EP heli of the ECO size. In fact I doubt a 300 would fit in the frame if it had to.
A standard servo like the 300 wieghs about 1.6 oz. A 85 goes at like .6 oz, so it saves 4 oz!!
But not all micro servos have 2 mounting holes. The JR 368 has 4 and it the same size as the 85.
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