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Re: Robot-Fish Psubs (was Re: Screw size and speed)
Hi Axle,
Thanks for the info. I took a quick look to see if anything new and
exciting was there (and there is some). I agree with the general consensus
though, that swimming propulsion is not likely to replace propellors very
soon, if at all. I just like to explore new ideas. My own school of
thought is to try placing two wings on the ends of two long pivoting beams
such that they sweep a short arc. The wings would pivot around the end of
the beams as they went back and forth in the arc. The horizontal forces
would cancel along with the tendency to move the hull sideways leaving a
pure forward propulsion with each stroke. This would lend itself well to
human power as the legs also work in short reciprocating strokes. To turn
one would only have to change the allowable pivot on the two wings (bias
each towards the side of desired thrust).
Thanks again and keep on exploring new ideas,
Dick Morrisson
Axel Iehle wrote:
> Hi all.
> Dick, below are some sites you can refer to for your next
> fish-like propelled Psub!
>
> http://web.mit.edu/afs/athena/org/t/towtank/www/tuna/index.html
> http://www.cee.hw.ac.uk/~sfakios/html/fishrobs.htm
> http://www.cee.hw.ac.uk/~sfakios/html/describe.htm
> http://www.dac.neu.edu/msc/lamprey.html
> http://mdesign.os.u-tokai.ac.jp/katolab/fin9.html
>
> Some think the future of subs is here. Look: Phil's already built
> a sub that swimms like a... Man! (Exosuit).
> (BTW, Phil, can you really move your legs to the point it can be called
> 'swimming' in the Exosuit?)
>
> Axel
>
> On Mon, 19 Jul 1999 10:19:33 -0700 Dick Morrisson writes:
> >Fish have a pretty good propulsion system for underwater use that
> >works at both
> >high and low speed and it almost never gets tangled in the garbage
> >(they may
> >choke on it but their propulsion system nearly always remains clear!).
> > Does
> >anyone in the group have experience with "non-propellor" (fish style)
> >propulsion? Is this a possibility for a small sub? And for those who
> >need lots of horsepower, think "blue whale"!