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Vacuum Powered Instruments - The Facts

Venturi sizes are measured in inches
This refers to the amount of suction measured in inches of mercury the venturi develops at 120 mph, not to the physical dimensions
The faster you fly the more suction is developed
Venturis should be mounted in the slipstream away from disturbed air
If you are not sure where this is on your aeroplane, look for inspiration from similar types
Connect with soft plastic hose
Avoid constrictive bends
An intake filter will prolong instrument life
Filters will block with use and so require inspection
Venturi powered gyros may not be effective until some time after take-off
Venturi systems are not ideal for IFR flight because they can ice up
A suction gauge will help to monitor the health of the system, but is not mandatory for VFR flight
A 2" venturi will power a turn and bank indicator only
A 4" venturi will power one vacuum horizon or a directional gyro
A 9" venturi will power a horizon, a turn and bank and a directional gyro, although convention says that if you have a vacuum horizon, an electric turn co-ordinator is the usual combination