[modeleng] Re: Thoughts on future projects....
- From: "Clifton" <clif.gwr@xxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Sun, 18 Mar 2012 10:42:11 -0000
Hi Wilfried,
I went down exactly the same route.
Years ago I built model boats & realized that for steering competitions you
could not beat a paddle steamer with independent paddle speed controls for
shear manoevability. One paddle forward,one reverse boats spins on the spot.
The snag was that using simple paddles the darn thing simply dug itself in
on one side. In actual fact the more it digs in, the more water the paddle
is trying to lift so making the problem worse. This in turn is compounded by
the fact that the paddle on the other side is now higher or out of the water
& is lifting less water.
I then had to learn about & build feathering paddles.
One useless bit of information is that whilst Tugs were allowed independent
paddles, all passenger steamers had to have them locked together on one
shaft.
Regards
Clif
----- Original Message -----
From: "Wilfried Vermeiren" <vermeiren.wilfried@xxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Sunday, March 18, 2012 9:44 AM
Subject: [modeleng] Re: Thoughts on future projects....
> Hi,
> I followed the tred about the paddle steamer with interest. Would
> certainly
> bee a project of interest.
> Quite a few years back one of the members of the model yacht club build a
> Thames paddle steam tug. These boats were rather narrow in hull form and
> were by nature not already that stable. I remember vividly the first
> trails
> with fixed paddles. The boat insisted in capsizing itself. It proved the
> case that the uplifting paddle tried to dig itself deeper and deeper into
> the water and as long there was an equal force on the opposite side things
> went reasonably ok . But once there was a heel to one side the problem
> worsened and the result was unavoidable and stopping the engine was the
> only
> option to save the boat.
> In the end the builder had to go the whole way and build in the
> compensation
> system for the paddles. Afterwards the boat performed like it was supposed
> to do.
> Just some thoughts and observations.
> Regards
> Wilfried Vermeiren
> http://users.skynet.be/modelbouw.wilfried
>
> -----Oorspronkelijk bericht-----
> Van: modeleng-bounce@xxxxxxxxxxxxx [mailto:modeleng-bounce@xxxxxxxxxxxxx]
> Namens Terry Lane
> Verzonden: zaterdag 17 maart 2012 21:29
> Aan: modeleng@xxxxxxxxxxxxx
> Onderwerp: [modeleng] Re: Thoughts on future projects....
>
> This link will give you the basics of doing 'em - I'm sure there is
> plenty more info about.
> http://nautarch.tamu.edu/PROJECTS/denbigh/WHEEL.HTM
>
>
>
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