On 2/2/23 19:55, Sanjeev Prabhakar wrote:
This is pretty, but there's a new blade profile coming into use on the
higher performance boats that is not only 20% or so more fuel efficient,
but 30+ db quieter. The nickle and dime crowd won't buy it, cuz the
maker wants 5 grand per regardless of size. The blades are somewhat like
a lockwasher with a bigger spring set, and a gap at the joint that fits
the hub on both end of the blade, 40 mph on a boat with a couple 300
horse yammerhammers at full song and blade cavitation noise is gone. All
you can hear is the yammerhaw's at full song.
I just read about it in a pocket web story a few days ago. The video is
I think on you tube but my old wet ram has already forgotten the name
they gave it.
The patent bears investigating.
Cheers, Gene Heskett.
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
On 2/2/23 19:55, Sanjeev Prabhakar wrote:
> 3 days back the fan blades profile was discussed
> following is produced in openscad (with python)
> Screenshot 2023-02-03 at 6.09.38 AM.png
>
> scad file is quite big 3.5mb and can be found here:
> https://github.com/sprabhakar2006/openSCAD/blob/main/fan.scad
> <https://github.com/sprabhakar2006/openSCAD/blob/main/fan.scad>
>
> python code can be found here:
> https://github.com/sprabhakar2006/openSCAD/blob/main/fan.ipynb
> <https://github.com/sprabhakar2006/openSCAD/blob/main/fan.ipynb>
This is pretty, but there's a new blade profile coming into use on the
higher performance boats that is not only 20% or so more fuel efficient,
but 30+ db quieter. The nickle and dime crowd won't buy it, cuz the
maker wants 5 grand per regardless of size. The blades are somewhat like
a lockwasher with a bigger spring set, and a gap at the joint that fits
the hub on both end of the blade, 40 mph on a boat with a couple 300
horse yammerhammers at full song and blade cavitation noise is gone. All
you can hear is the yammerhaw's at full song.
I just read about it in a pocket web story a few days ago. The video is
I think on you tube but my old wet ram has already forgotten the name
they gave it.
The patent bears investigating.
>
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> OpenSCAD mailing list
> To unsubscribe send an email to discuss-leave@lists.openscad.org
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/>
