DARPA’s silent MHD magnetic drives for replacing naval propellers
naval-technology.com
DARPA’s silent MHD magnetic drives for replacing naval propellers
1–10 of 109 posts
Re: DARPA’s silent MHD magnetic drives for replacing naval propellers
#2[flagged]
Re: DARPA’s silent MHD magnetic drives for replacing naval propellers
#3> If power and efficiency issues are resolved,
My gut feel is that this is a pretty grossly inefficient system by nature. Inducing current in seawater just to give magnetic traction something to push off against seems semi absurd.
Re: DARPA’s silent MHD magnetic drives for replacing naval propellers
#4By using AC you can induce current in the water and avoid the need for electrodes, but low efficiency. By using high strength permanent magnets they can trade those.
Re: DARPA’s silent MHD magnetic drives for replacing naval propellers
#5[deleted]
Re: DARPA’s silent MHD magnetic drives for replacing naval propellers
#6Isn't this the plot for Hunt for Red October?
Re: DARPA’s silent MHD magnetic drives for replacing naval propellers
#7> If power and efficiency issues are resolved, My gut feel is that this is a pretty grossly inefficient system by nature. Inducing current in seawater just to give magnetic traction something to push off against seems semi absurd.
semi absurd is kinda why DARPA exists!
Re: DARPA’s silent MHD magnetic drives for replacing naval propellers
#8Wouldn't the intense electro-magnetic signature of this drive make it highly detectable in an otherwise quiet ocean?
Re: DARPA’s silent MHD magnetic drives for replacing naval propellers
#9Isn't this the plot for Hunt for Red October?
Yes. "Caterpillar drive". Fantastic book and movie.
Re: DARPA’s silent MHD magnetic drives for replacing naval propellers
#10Wouldn't the intense electro-magnetic signature of this drive make it highly detectable in an otherwise quiet ocean?
Bay area waters were (are?) used as a naval magnetic silencing range. Most navy ships have degaussing coils that calibrate with magnetosphere
