I never really liked the small props on the openPPG, but I know they help make it foldable and are simple, but efficiency is of course less than a larger prop.
I ended up buying 2 30" props and 9235 motors for another project, but then I thought, why not make an electric paramotor out of them, and bought 2 more. The design process is still in its infancy, but it ls looking good. It may end up being a whole new design, but first I am going to try to modify the OpenPPG frame to accept my power system…
of course to fit 4 30" props they have to be overlapping.
Some more info here Eppg1 design at primalflight paramotorforum, but I will also post stuff here.
(link is to a brand new forum that I created…not trying to take people away from here, just a place to put stuff)