Dylan Smith wrote
Any icing and it will - they tend to be very susceptible to it.

First off, it takes time to ice up a venturi - dry vacuum pumps just
go bang and shear the drive coupling.

Second, much depends on where you mount them. The hot tip (so to
speak) is to place them just behind the exhaust.

On the other hand, the aircraft on which you tend to find venturis are
usually slow, stable and easy to fly with just needle/ball/airspeed

Absolutely true.

Michael