AcrobatIvo's 2-steps: Base's Craniocaudal axis
These are machines where the Flyer (primarily) rotates around the Base's Craniocaudal axis clockwise or counterclockwise.
Ivo's Bicycle rotates primarily around Base's Craniocaudal axis, and around Flyer's Anteroposterior axis: CA machines.
Hip Slide (aligned with base) rotates primarily around Base's Craniocaudal axis, and around Flyer's Craniocaudal axis: CC machines.
Front Hip Circle: rotates primarily around Base's Craniocaudal axis, and around Flyer's Left-Right axis: CL machines.
I have created some of these machines, which by their nature are similar to each other.
CA
CC
Archimedes' Screw [Armpit-to-Foot, Down Goofy Armpit-to-Foot]:
Goofy Archimedes' Screw [Goofy Armpit-to-Foot, Down Armpit-to-Foot]:
CL
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These are machines where the Flyer primarily rotates around the Base's Craniocaudal axis clockwise or counterclockwise.
Barrel Roll, around Base's Craniocaudal axis, around Flyer's Anteroposterior.
Frontisserie, around Base's Craniocaudal axis, around Flyer's Craniocaudal axis.
I have created some of these machines, which by their nature are similar to each other. Several have some form of intricate footwork.
The Ivo's Bicycle is one of the simplest
Here they are sorted mostly in alphabetical order (but with Rewinds and Reverse next to the machine, when it is also here).