--- In Paddleducks@y..., "David Allinson" <dallinson@a...> wrote:
> I think if you knocked up a quicky test paddle wheel (no
> feathering, plasticard would do fine) the same basic size as yours
> and then give it some tests using hand rotation in the
> basin, you would find that it would produce very little thrust
> indeed at 50
David...this is a fine idea...to build a pair of simple RADIAL test
paddle wheels quickly out of styrene which replicate the SAME diameter
and float surface area of the final ones. These could be as simple as
a disc with slots cut in for the floats to be attached...a 30 minute
job! It gives the modeler an opportunity to thoroughly evaluate
rotation and paddle area, along with torque and gearing requirements.
When I think back to the old "Director" days over a year ago (when I
was actually BUILDING a paddler rather than just TALKING about it) I
remember thinking "I'll just use these old paddles for testing
purposes, then when I'm satisfied on the right area/shape of the
paddles I'll build a really "good set". Well, I was able to add and
modify the paddles so easily (styrene with it's instant cutting and
welding properties) to achieve perfect performing paddles and which I
never changed as they work SO WELL! ONE day I'll just take all the
measurements and transfer them to a "dressy" pair of wheels that looks
good out of the water too...with rivet heads, braces and all!
> Incidentally, I have plumped for a toothed belt drive. I weighed up
> both options and decided that the toothed belt would be quieter
> (possibly not much), corrosion free, more misalignment tolerant and
> require no lubrication.
Rubber belt drives are SILENT and smooth and definitely my own
preference, but only with electric motors. (I would however,
recommend that the engine mountings are adjustable for and aft to
achieve the ideal belt tension). You'll recall I get my 1 3/4 in.
"belts" from the hardware store..pipe reduction seals! I have mounted
my twin engines on sliders which work very well. I don't believe
Stuart can entertain belt drives because of the substantial heat
generation from the boiler(s), so his little chain drive will be
ideal.
Looking forward to hearing how you get on with your test wheels, which
you should not be surprised will STILL be on "Scotia" a year after
she's launched!
PJ
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