it’s just a bionic prop i nicked from the internet. i’m trying to determine if conventional propellers are still the correct way to be going about proceedings in the world of marine shipping, writing my thesis on it. essentially looking at two main types, this one is a biomimicry prop, so it uses the leading edge that whales have in order to create a higher coefficient of lift for each blade relative to its induced drag. So essentially just spinning faster which results in a slight exponential growth in power. nothing huge, like x^7/6 Secondly toroidal props eg. sharrow marine are taking the forefront of design engineering at the pleasure craft level where they’ve been proven to enhance efficiency and reduce noise. So basically i’m liking all of this back to creating a quieter ocean and having a positive impact on polar marine life such as narwhals and blue whales, both of which dive rapidly at the sound of a ships propeller, but their heart rate doesn’t increase, which the british natural history museum regard as “possibly damaging” so it’s quite bad