Ardupilot Arduplane APM2.5 2.6 Airspeed Meter For RC Airplane
Note:Just for reference, not included the white Airspeed tube
Brand Name: Ardupilot / APM2.5 2.6
Item Name: Airspeed Meter
Airspeed do some helps with heavy wind, slow speed flying and automatic landing
Working principle: upper tube is dynamic (measuring the air pressure of front opening, air is compressed into airspeed tube), the bottom tube is static (measuring the side port airspeed tube)
You can use APM Planner or stand on the ground to got the numerical value.
Blowing into a pitot tube to observe the response.
Zero in the still air and small value oscillation (2-3) are normal.
The airspeed change with the pressure's square root.So the change under close to zero pressure difference is very small,while in flight need more pressure to generate the estimated speed changes.
If you see the most numerical value is 0,1,2, the occasional rebound to 3 or 4, think it is normal.
You will not see this change in flight.
1 x Airspeed Meter