Vertical Axle Wind Turbine(VAWT) with noise decreasing upgrade

this is a VAWT I made at the local fablab(protospace)
according to the labmanager the twist in the blades removes the pulsating noise
the normal darieus makes.
it`s made in openscad but the code is a little messy.(apart from openscad I only wrote some hello world like things for python tutorial exercises)