Phil Swan returned to talk about the physics plus economics of using a Variable-Pitch Screw Architecture Mass Driver from Earth to the Moon or Mars. Phil has two papers posted and/or linked through the blog on this subject. Phil spent lots of time going over the physics of his concept, explaining the Variable-Pitch Screw drive, comparing it to rockets and even talking logistics and location for the mass driver on Earth. He is thinking anchored to the ocean floor floating about 20 meters below surface. He got several questions asking him about big ideas that never see the light of day. Others suggested modifications to his screw drive mass driver. Listen to what he had to say about energy transference and kinetic energy. Phil was asked about size and launch location which would maybe polar but also within 22 degrees of the equator north or south. Read the full summary of this program when available at www.thespaceshow.com for this date, Friday, January 17, 2025.