Since the props are gllued to the shaft, I have made some prop/shaft upgrades. I have made two. One 31mm that has more pitch than the stock 31mm. And a 33mm. I have also made a 7 cell battery upgrade. I had to modify the battery tray to get it to fit. Here is another pic of the 31mm prop/shaft combo installed.
I emailed Proboat and they said, and I quote "Thank you for your recent email. I do not have any additional
information about the prop as of yet, however the prop comes included in
an assembly PRB3013. The prop is most likely threaded on to the shaft". However, I am pretty sure he is wrong. I tried to unthread it and it didn't want to budge. It might have lock tight on it. But I didn't want to break it before I at least ran it stock one time. I made that mistake with my SW26 a long time ago. I never ran it stock.