Re: Screw size and speed

[Michael B Holt <michaelbholt@juno.com>]

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"!

There's something called "Turbo-tuna" that tried just this.  It seems to
take a lot more power.   And you lose parts of the hull to the flexible 
part.

There's a chap in Canada. however, who's worked out a flexible paddle
that is moved by a mechanism he usually powers with a bicycle-type
pedal arrangement.   It was in WoodenBoat a couple of years ago.
I'll ask about it.



Mike Holt
-- 
 

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