I just saw a motor out of a manufacturer in San Diego and have chat with the creator. It's full blown ready to go and I think is very close to Torqeedo's efficiency but cost a bit less than half. The motor itself weighs only about 2 lbs -with external battery and can be adapted to scuba diving etc. They have worked closely with Hobie who is also out of San Diego. IT's called 'Bixpy Jet'.
I don't get anything out of this post but you can check it out if you are curious at
https://www.kickstarter.com/projects/bi ... escription
I plan to transit from Torqeedo to this for my kayaks. Given its weight, I can even use it for my 4 lbs inflatable Advanced Elements Packlite when hiking into the sierras.
If you go through the link above and support, let me know and I'll sport you $50 credit for their products. No, I'm not affiliated them other than being a supporter but they are giving some referrel credits. Contact me after the project is over and funded and I'll have them do the $50 for you.
TT, if the last paragraph is not OK, let me know and I'll strike it. Thanks!