[PSUBS-MAILIST] Vertical Thruster

[Anders Ljung via Personal_Submersibles]

Hello

Using one or two minnkotas for this application would be similar to a
hamster humping a rhino hehe . The water in the free flooding space has to
be accounted for in the moment of inertia
so its roughly 12 tons that needs to be put in motion so....let the
minnkota stay on the rowing boat :) you need to use the same components as
the lateral thrusters uses or something similar,
which is a 3 kW hydraulic motor driving a Kaplan turbine pump jet. There
are reserve penetrators in the tower area that could route the hydraulic
lines. The thrust will decrease by the
Cos sinus angle of deflection  in order a 45 deg deflection will result in
some 30 % loss in thrust. It is possible to make a rectangular nozzle where
the deck meets the pressure hull as long as the same cross section
area of the duct is maintained. The coanda effect off the curvature of the
pressure hull will help straighten out the water jet and also to some
degree contribute to lift.

And Lasse...please make sure all of the money you owe me for the sub is
paid before cutting a bunch of holes in it ;)

best regards

Anders Ljung

2015-01-12 10:29 GMT+01:00 Lasse Schmidt via Personal_Submersibles <
personal_submersibles at psubs.org>:

> Hey guys,
>
> When talking about motors, I have som thoughts about making a smaller
> modification to my sub.
> I´m thinking of putting a vertical thruster, hidden behind the tower of
> Malen.  Malen does´t have a vertical thruster and it would make
>  manoeuvring a lot easier. I hope it can be done without messing up the
> look of the sub, which is important.
>
> My idea is to suck water just behind the hatch, and let the water leave
> downwards and exhaust from the both sides of the tower. The actual jet can
> not go straight down due to the design of the tower, is that a
> superproblem? Another important question is, what thruster is good for the
> job? I have been thinking of maybe using one or two minnkotas. Any thoughts
> and ideas are much appreciated.
> Take a look at the attached sketch, I hope it´s understandable.
>
>
> Cheers,
> Lasse Schmidt
> Crashdive.se
>
>
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>
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