  We propose JetUnit, a water-based VR haptic system designed to produce force
feedback with a wide spectrum of intensities and frequencies through water
jets. The key challenge in designing this system lies in optimizing parameters
to enable the haptic device to generate force feedback that closely replicates
the most intense force produced by direct water jets while ensuring the user
remains dry. In this paper, we present the key design parameters of the JetUnit
wearable device determined through a set of quantitative experiments and a
perception study. We further conducted a user study to assess the impact of
integrating our haptic solutions into virtual reality experiences. The results
revealed that, by adhering to the design principles of JetUnit, the water-based
haptic system is capable of delivering diverse force feedback sensations,
significantly enhancing the immersive experience in virtual reality.
