bbq870 said:how/where can I find an "efficient" jet drive?
and how much less efficient are they compared to impellers?
edit:
for an impeller, would it make sense to rewind a motor to have less RPM?
https://www.mhz-watercraft.com/jets/504/ersatzimpeller-jet-52-52mm-durchmesser-ersatzteil?c=109
or
https://www.mhz-watercraft.com/jets/503/impeller-jet-64-64mm-durchmesser-ersatzteil?c=109
Both will definitely handle 16k rpm and I'd think they would be fine to 20k rpm
A jet is a lot less efficient than prop, but for this application would work fine.
You just need more power because of the inefficiency. I think a 3-4KW jet drive might be able to get you up, but that is just a thumbsuck...