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Old 02-03-2024, 11:54 AM   #11 (permalink)
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Quote:
Originally Posted by Phase View Post
...Seems like a lot of moving parts and mechanical costs for something that could always be installed.

https://newatlas.com/automotive/hyun...ive-air-skirt/
I did not know spats/deflectors were important enough to warrant such attention and financial resources.

Hey, the New Atlas website is awesome, thank you for sharing.

That site lead me to start a post elsewhere on the topic of biomimetic electric outboards.

https://www.boatdesign.net/threads/f...eatures.68717/

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Old 02-03-2024, 02:20 PM   #12 (permalink)
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Quote:
Originally Posted by aerohead
The Interstate Highway System is designed for 100-mph travel.
Maybe in theory. In practice there is one spot North of Salem, OR on I-5 Southbound that's out of spec.

The FinX is very interesting.
newatlas.com/marine/finx-biomimetic-electric-outboard/
www.boatnews.com/story/44356/finx-test-fin5-a-propellerless-electric-outboard-motor

What they don't mention is that it uses a Coanda Nozzle. The two membrane version, for heavier vessels, seems less straigthforward. Maybe employs vortex streets?

Don't know about the company's outboards, but their videos are top-notch.

..or industrial porn, depending on your point of view.

The only other biomimetic boat propulsion I'm aware of it R. B. Fuller's Mechanical jellyfish.

http://3.bp.blogspot.com/_snptbTw3yB...+jellyfish.JPG
http://klbuckyians.blogspot.com/2009...jellyfish.html
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Old 02-03-2024, 02:40 PM   #13 (permalink)
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Quote:
Originally Posted by kach22i View Post
I did not know spats/deflectors were important enough to warrant such attention and financial resources.

Hey, the New Atlas website is awesome, thank you for sharing.

That site lead me to start a post elsewhere on the topic of biomimetic electric outboards.

https://www.boatdesign.net/threads/f...eatures.68717/
Makes me think I should rebuild one of my rear wheel deflectors that broke off my car years ago. Havenít put much effort into it in a car that gets 60 mpg already but maybe itís important
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Old 02-05-2024, 12:28 PM   #14 (permalink)
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' FinX'

* I'm not seeing any connection to dolphins.
* It's 'reciprocal' motion, rather than 'rotary.'
* It appears to 'borrow' heavily from Dyson's 'bladeless fan.'
* The supporting strut is hydrodynamically 'dirty.'
* The toroid itself is hydrodynamically 'dirty'.
* A back-to-back comparison to an equivalent energy consuming 'Minnkota'-esque electric trolling motor would be instructive.
There's no context in their 'comparison' which would suggest any advantage as far as thrust-per-kWh ratio.
* Third-party testing / benchmarking.
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Old 02-05-2024, 03:54 PM   #15 (permalink)
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Quote:
* It appears to 'borrow' heavily from Dyson's 'bladeless fan.'
Jetoptera also.
Quote:
* A back-to-back comparison to an equivalent energy consuming 'Minnkota'-esque electric trolling motor would be instructive.
The only comparison I saw was 'good torque but low top speed.

Explainers in the dedicated thread.
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Old 02-08-2024, 11:19 AM   #16 (permalink)
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' torque'

Quote:
Originally Posted by freebeard View Post
Jetoptera also.The only comparison I saw was 'good torque but low top speed.

Explainers in the dedicated thread.
'Torque' is a conceptualization associated with 'force at a distance,' and typically associated with rotary motion.
The FinX imparts it's energy to the water column as a 'cyclic-pulsed water jet reaction force', unlike direct fluid coupling of a propeller, of some known mechanical efficiency, with it's surface boundary acting against the contacting fluid interface.
'Torque' seems like a weird attribute to assign to what FinX does.

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