The simplest ASI would be
The simplest ASI would be the Hall airspeed indicator used on ultralights. It is an 8" vertical tube with an opening at the bottom facing upwind containing a ball which rises higher with increasing airspeed. They read from 0 to 80 MPH, cost about $20, and are readily available on-line. They are normally mounted on a brace or fairing on the ultralight, but could be mounted on your driver's side mirror, or for a more permanent installation, on your dashboard with a tube running forward through the engine compartment to the front of your grill.
|