1176Re: Pop-Pop Steamboats membership
- Jan 4, 2009Hi Donald,
The thing that interests me about the pop pop is its simplicity and I
can play around with them without a machine shop. I don't mind adding
a valve or two tho.
The Newcomen or atmospheric engine evolved into the Watt, and was
never seen again as it was so innefficient.
Interestingly now you point it out, there seems to be a similarity
between the Newcomen and the pop pop - both rely on condensing steam
to create a vacuum.
--- In firstname.lastname@example.org, Donald Qualls
> Richard Mundy wrote:
> > Hi Frank,
> > this is very interesting. As this boat is a half scale replica, I
> > assume the only development work was to figure out how it was
> > and how it worked. Has anyone experimented with this system toto
> > improve efficiency?
> > Dick
> Presuming you're not just interested in (for instance) using steam
> drive an axial-flow or centrifugal jet pump of the kind now commonin
> jet boats, one obvious series of improvements to the originalRumsley
> design would be use of a valve operated, rather than quenchedengine)
> atmospheric engine (i.e. upgrading from Newcomen to Watt type
> and automatic valve train, presumably with double acting cylinder(s) and
> double acting pump(s); followed by use of multiple cylinders toincrease
> the rate and steadiness of flow through the propulsion duct alongthe
> keel. Addition of a reversing gate (preferably attached to therudder,
> to retain efficient steering in reverse) or universally couplednozzle
> (for direct thrust vectoring through 360 degrees) would be stronglypropulsion
> suggested as well. It ought to be possible to manage a final
> efficiency not much below that of a paddle wheel mounted to asimilarly
> designed boiler and engine with just these improvements -- andstill
> have a boat with considerable novelty value, given the very shallowline...
> draft possible and lack of fragile moving parts below the water
> If, through hard work and perseverance, you finally get what you
> it's probably a sign you weren't dreaming big enough.http://silent1.home.netcom.com
> Donald Qualls, aka The Silent Observer
> Opinions expressed are my own -- take them for what they're worth
> and don't expect them to be perfect.
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