TECHNICAL SPECIFICATIONS
Frame: Support frame made in xx mm carbon fiber, composite plastics, and aluminum
System Transmission: Twin belt drive system — 9 mm main belt, 4 mm tail belt
Main Blades: 385 mm maximum
Battery Options: LiPo from 3S to 6S (typical setup: 1300 mAh – 1800 mAh 6S; 2200 mAh 6S max)
Battery Compartment Dimensions: 24 mm × 33 mm × 100 mm
Suggested Battery: LiPo 6S 1800 mAh
Main Rotor Diameter: 864 mm (with 380 mm blades)
Tail Rotor Diameter: 181 mm (with 67 mm tail blades)
Total Length (without blades): 800 mm
Total Length (with blades): 1003 mm (with 380 mm blades)
Main Shaft Diameter: 6 mm
Tail Shaft Diameter: 5 mm
Height: 235 mm
Swashplate Servos: 3 × micro servos
Tail Servo: 1 × micro or mini servo
Teeth Pinion: 21T (5 mm hole included) | Optional: 20T, 22T, 23T, 24T, 25T (5 mm hole)
Main Pulley Teeth: 120T
Tail Ratio: 4.27 : 1
Tail Boom Diameter: 17 mm
Spindle Diameter: 5 mm
Twin Belt
TRANSMISSION
The Protos 380 implements a robust twin belt transmission, with auto tail belt tensioner. This translates into thousands of maintenance-free flights and whisper quiet transmission. With the lack of gear mesh, the Protos 380 can handle huge power, while delivering it with no transmission noise. A robust one way bearing assembly is located in the main pulley assembly. The low drag setup allows great autorotation performance in a small package.
Robust tail system
FOR THE ULTIMATE PERFORMANCE
Replacing belts should be easy. So the Protos 380 implements an aluminum single sided tail box to make field replacements fast and simple. The tail implements thrusted tail grips design for precision tail control. The Protos 380 implements a high tail ratio (4.3) with a low profile boom that's capable of the most demanding maneuvers. An optional speed up pulley offers a 4.47 ratio for extreme tail performance even at lower headspeeds. The tail is capable of handling extreme overspeeds with no resonance, which ups the fun factor. The 17mm boom is designed such that no supports are needed, reducing weight and optimizing tail performance.
Auto
BELT TENSIONER
MSH is a big fan of "set it and forget it". The auto belt tensioner pushes the Protos 380 tail performance to all new levels, while allowing the pilot to just forget about checking and setting the tension flight after flight, despite changing environmental conditions. It also allows the tension to be reduce significantly improving auto-rotation performance.