I have inlcuded 2 pictures of the support wich is needed and a build video on my Youtube channel the motor is out of a wacuum cleaner called the Rowenta Airforce 360 so its the Nidec motor 21F706L040 (see picture).

for the servo mount i used this one: https://www.thingiverse.com/thing:2988830/files

if you dont have a sevo arm you can download one here: https://www.thingiverse.com/thing:5428914/files

as the driveshaft i used a 4 mm carbon rod: https://de.aliexpress.com/item/1005004399707115.html?spm=a2g0o.productlist.main.9.96f3xGIyxGIyqf&algo_pvid=5374e7fd-0105-41f9-8c16-971622faf841&algo_exp_id=5374e7fd-0105-41f9-8c16-971622faf841-4&pdp_npi=4%40dis%21EUR%216.12%216.12%21%21%216.51%216.51%21%40211b441e17217716471584723ea764%2112000034202632881%21sea%21DE%216032517174%21&curPageLogUid=CZvsxQoYdHkE&utparam-url=scene%3Asearch%7Cquery_from%3A

PROPS:

The toroidal propelller is designed by JWoodrell https://www.printables.com/de/model/619042-toroidal-boat-prop-swept-blades

and the otter one was designed by efoil https://www.printables.com/de/model/576544-toroidal-prop-for-efoil/files

the NORMAL prop was designed by SmilingImpact https://www.printables.com/de/model/226476-rc-boat-propeller

PARTS:

servos : https://de.aliexpress.com/item/1005006068132473.html?spm=a2g0s.12269583.0.0.1a6167a7NzZz3v&gatewayAdapt=glo2deu

speedcontroller and a motor : https://de.aliexpress.com/item/1005005293706657.html?spm=a2g0s.12269583.0.0.7389282bQ2wvMn&gatewayAdapt=glo2deu

radio and reciver : https://de.aliexpress.com/item/1005003052704561.html?spm=a2g0s.12269583.0.0.227550fehH9IiF&gatewayAdapt=glo2deu

If you are not able or dont want to buy a vacuum just for this boat you might have to make a adapter or you have to ask me and if I get asked a lot i might make one myself.☺