We report on the ongoing development of a new style of instrument package to measure three-dimensional
flow speed and direction in wildland fires. The all-metal construction and lack of moving parts enables the
instrument to survive immersion in flames for measurements in all fuel types. Disk style probes are used
instead of the more common bi-directional probe to improve angle sensitivity of pressure measurement.
Improved angular discrimination will permit calculation of fully three dimensional flow direction in addition
to flow speed. An instrument package incorporating the disk anemometry system was developed and
underwent preliminary testing. While the disk-style probe shows some improvement in angular sensitivity
over a bi-directional probe, further improvement will result in greater tolerance in small inaccuracies in
pressure measurement.