Airspeed for cuadplane, is mandatory?

It´s neccesary an airspeed for cuadplanes, or it´s possible to fly without it? I never use them.

I found this which sort of indicates you can use it without an air sensor but probably better with one. Quadplane without airspeed sensor problem

Thank´s, I read something that analog airspeed doesn´t have good accurate, it´s enought for a cuadplane or I need a digital one? Wiki doesn´t reccomends for newbies, I´m an eternal newbie. :blush: