The rate at which the solar wind extracts angular momentum from the Sun has been predicted by theoretical models for many decades, and yet we lack a conclusive measurement from in-situ spacecraft. Here I present recent analysis (performed during my PhD under the supervision of Sean P. Matt at the University of Exeter) of the solar wind angular momentum flux from Parker Solar Probe, and I outline my current efforts in performing a multi-spacecraft analysis taking observations from both Parker Solar Probe and Solar Orbiter at different radial distances. In addition, I present some new and ongoing research that I am performing as a postdoc in the WHOLESUN ERC project (supervised by Sacha A. Brun at CEA Paris-Saclay). Here I wish to derive the energy input to the solar wind according to realistic RMHD simulations of the solar atmosphere. Please do not hesitate to contact me if you would like to discuss/ collaborate on either topic I present here.