ReadyToSky GH-S37D 3.7g Digital Micro Servo with Accessories

The GH-S37D is a 3.7g digital micro servo for ultralight RC models: indoor flyers, hand-launch gliders, micro planes and small cars or crawlers where every gram counts. Its 3.6–4.8 V range means it can run straight from a 1S supply.

Key features

• 0.8 kg·cm stall torque at 4.8 V (0.6 kg·cm at 3.6 V), enough for control surfaces on light airframes
• 0.1 s/60° at 4.8 V for crisp, quick surface response
• Coreless motor and plastic gear train keep the weight to 3.7 g
• 90° working angle: plan linkage geometry and endpoints around that throw
• Ships with a 3-pin lead and mounting hardware

Specifications

• Weight: 3.7 g
• Dimensions: 20 x 8.75 x 22 mm
• Operating voltage: 3.6–4.8 V
• Stall torque: 0.6 kg·cm at 3.6 V, 0.8 kg·cm at 4.8 V
• Speed: 0.12 s/60° at 3.6 V, 0.1 s/60° at 4.8 V
• Working angle: 90°
• Motor: Coreless
• Gears: Plastic
• Signal: PWM, 1000–2000 µs
• Operating temperature: 0 to 60 °C

Check your power source before fitting: 4.8 V is the ceiling, so a 5 V or 6 V servo rail will overdrive it. Use a 1S pack or a BEC set to 4.8 V or below.