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Subject 
The difference between the AirX and the Air 403 
Author 
Ben Farmer 



Rated Output
Airx: 400 watts @ 28 mph
Air 403: 400 watts @ 28 mph
Peak Power
Airx: 550 watts
Air 403: 650 watts
Power Controller
Airx: Microprocessorbased RPM control with peak power tracking for minimizing blade noise, and optimizing
bladetoalternator efficiency. Lower tip speed.
Air 403: Passive charging
Voltage Regulator
Airx: Reads at battery for increased efficiency, better braking, and zero trickle charge.
Air 403: Reads combined voltage of wire and battery. Trickle charge in high winds.
Over Speed Control
Airx: Electronic torque control limits RPM, results in quieter operation.
Air 403: Passive pitch control: aerodynamic blade flutter limits RPM.
Rectification
Airx: Internal, synchronous rectifier bridge
Air 403: Internal
Warranty
Airx: 3 years
Air 403: 3 years
Weight
Airx: 13 lbs. (5.85 kg)
Air 403: 13 lbs. (5.85 kg)
Rotor Diameter
Airx: 46 in. (1.15m)
Air 403: 46 in. (1.15m)
Voltage
Airx: 12 & 24 Vdc (48V Jul '02)
Air 403: 12, 24, 36, 48 Vdc
Battery Bank: Minimum
Airx: 25Ah: The circuit cuts off all current at full charge.
Air 403: 400Ah: trickle charge
Start up speed
Airx: 7 mph (3.13 m/s)
Air 403: 8 mph (3.58 m/s)
Survival Wind Speed
Airx: 110 mph (49.2 m/s)
Air 403: 110 mph (49.2 m/s)
List Price ($US)
Airx: $649
Air 403: $595
AirX Improvements
1. Much lower noise: Electronic braking instead of blade flutter allows for much quieter and neighborfriendly operation.
2. Improved battery charging: Measures voltage at the battery for a true voltage reading resulting in more efficient charging. All current is shut off at the full charge. No trickle charging.
3. Lower stress design: Power is controlled through torque control and is not dissipated by the electronics resulting in lower stress on the electronics, bearings and other materials. High wind electronic stall protection slows blades to 600 rpm, significantly reducing turbine and tower loading.



