William Fraser's video: Model Aircraft propellers - UNDERWATER

My own performance test with an rc aircraft propeller on a solar kayak: https://youtu.be/6u-j1gxQRGc I explore the controversial topic of using aircraft propellers underwater. I explain their unexpectedly good performance and compare it to known marine propeller performance. Wind-tunnel test data for model aircraft props was obtained from: https://m-selig.ae.illinois.edu/props/volume-1/propDB-volume-1.html Marine propeller performance curves were extracted from: Article 237, May 1981 "KT, KQ and Efficiency Curves for the Wageningen B-Series Propellers" By Bernitsas, Ray and Kinley. Department of Naval Architecture and Marine Engineering, The University of Michigan. Marine propellers geometries were generated with the Design Tool at: https://www.wageningen-b-series-propeller.com/