[modeleng] Re: Thoughts on future projects....
- From: Terry Lane <tel.47@xxxxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Sun, 18 Mar 2012 07:29:15 +1100
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
On 18/03/2012 7:01 AM, Terry Lane wrote:
> Ah.. I don't know about that - feathering paddles look a lot more
> complicated than they actually are and would add a great deal of
> interest to the project. The sponsons add very little to the overall
> width and I have seen successful examples here in both model and small
> 'real' boats.
> On 18/03/2012 4:47 AM, stepney wrote:
>
>> Fitting the feathering to a small boat, with the complexity it entails,
>> would be a major task.
>> Plus the added width might make life difficult, not least for
>> transporting the boat on land.
>> Hence I assumed (perhaps wrongly) that it wouldnt have feathering paddle
>> wheels.
>>
>> I wouldnt be in favour of electrical powered boiler. If it is going to
>> be used, may as well fit an electic motor!
>> Alan
>>
>> On 17/03/2012 12:54, Clifton wrote:
>>
>>
>>> Hi All,
>>>
>>> For the best efficiency of paddles they need to feather. This means that
>>> each paddle enters the water vertically, travels backwards through the water
>>> then exits again vertically. This avoids the loss of efficiency by the
>>> paddles first slapping the water then trying to lift a load of water
>>>
>>> To achieve this it means that each paddle has to pivot individually with a
>>> linkage to a fixed offset point. Rather like a loco eccentric.
>>> The biggest snag is that you need a set of sponsons outboard of the paddles
>>> to carry the fixed eccentric point.
>>>
>>> Just recently I think in EIM there was a article on a model boat with a
>>> electronically controlled Flash steam boiler. I see no reason why it could
>>> not be scaled up.
>>>
>>> Regards
>>>
>>> Clif
>>> ----- Original Message -----
>>> From: "stepney"<alan@xxxxxxxxxxxxxxxx>
>>> To:<modeleng@xxxxxxxxxxxxx>
>>> Sent: Saturday, March 17, 2012 11:11 AM
>>> Subject: [modeleng] Re: Thoughts on future projects....
>>>
>>>
>>>
>>>
>>>> Coming back to the steam options that Chris mentioned,
>>>>
>>>> I know someone who has done a lot of research on steam bikes. An
>>>> ex-university lecturer, he has written an interesting paper on them plus
>>>> a comprehensive survey. There was one running at the St Agnes rally a
>>>> few years ago.
>>>>
>>>> Generally, they werent too successful as motorbikes, but could be good
>>>> fun.
>>>>
>>>>
>>>> As for steam boats, there was an interesting flash steam boiler at... I
>>>> think it was Donnington, a few years ago. I have photos and details
>>>> somewhere.
>>>> It made a compact unit that provided lots of steam.
>>>> Plus, of course, no actual pressure vessel to test.
>>>> That would be my choice for such a vessel. The other option is a
>>>> vertical boiler, which is common and for which there are numerous
>>>> designs available.
>>>>
>>>> For the engine, and without doing any calculations, I would guess that 3
>>>> or 4hp, would suffice.
>>>> (Paddles being less efficient than a screw, and to raise the efficiency
>>>> of paddles means quite complex paddle design, so I assume they would be
>>>> fairly basic=less efficient.)
>>>> There are lots of engines that would provide that power. Some of the
>>>> Leak designs would do, but for a paddle steamer, I would go with an
>>>> inverted V, much like the model that Tel built last year (or was it the
>>>> year before?).
>>>> An enlarged version of that would give a low CofG, and take up little
>>>> space.
>>>>
>>>> Alan
>>>>
>>>>
>>>>
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>
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