MGL Avionics Stratomaster Ultra “L” Owner’s manual
Page 68
Pitot and static port (Continued from last page)
Suitable connection hose for both pitot tube and static port can be obtained from a hardware
store or even a pet shop. Good quality tubing is often used for fish tanks and it has just the right
diameter.
Please note that this kind of tubing is not advised for pressurized aircraft. In this case you would
need to obtain aircraft grade tubing of suitable diameter. You would also have to use hose clamps
to fasten the hose onto the Stratomaster pitot and static ports.
The Stratomaster Flight instrument allows you to calibrate the airspeed reading. This is done in
the “Device setup Menu” “ASI Gain”. The main reason for this is to be able to remove errors
introduced due to the airflow around your aircraft which may have an effect of your pitot tube
pressure build up.
If you have a GPS receiver with a ground speed function you can use this as reference after
allowing for any winds (Choose a wind still, absolutely calm day if possible).
You should also compensate for density altitude before you correct the ASI reading. It is quite
normal to under-read on the ASI if your are flying at higher than sea level in moderate or high
temperatures. You can set the Stratomaster Flight instrument to display “True airspeed” or TAS.
In this case a correction factor depending on your current altitude is applied.
Zeroing the air-speed sensor.
It may be required from time to time to zero the airspeed and VSI readings. This will be true if you
are reading a small VSI or ASI when the aircraft is standing still on the ground.
Ensure that the readings are not caused by winds or other factors before performing the zero
calibration. Also, ensure that no wind is blowing into the pitot tube.
The zero calibration is outlined in the owners manual. It is quick and easy and will ensure that
your Stratomaster Flight will perform at its best at all times.
