It now seems that "Seven Days" is best for me to build. (My wife liked it too. Last time we both liked the same thing we bought a house!) I ordered the Propeller handbook to study up. I'll be curious to see if the choice changes.
I'm building the Hasbrouck Engine #5, a 2-1/2 to 3 HP double acting 2" dia. by 2-1/2" stroke, twin cylinder. It doesn't require castings and only needs a 9" lathe and a mill. I've completed most of the lathe parts, but don't have a mill yet. Do you know of any for sale in the midwest?
On Thu, Aug 26, 2010 at 12:30 AM, John Kohnen <jkohnen@...>
Is the propeller part of a kit you're building the engine from? If you
don't already have the propeller, you may not need to use a 15" one, and
even if you've got one you might be able to use it as trading stiock.
Steam engines like big, slow propellers, but the right propeller for the
job depends not only on the engine, but also the boat and the speed you
want to go. 15" x 22" might be just right for the typical heavy
displacement launch people usually put steam engines into, but it might
not be best for a lighter boat like Seven Days, so you might be able to
use a smaller propeller to advantage -- and shallower draft.
As someone mentioned, Dave Gerr wrote a whole book on propeller selection:
What steam engine are you building, Mark?
On Tue, 24 Aug 2010 07:44:59 -0700, mark wrote:
> I'm in the process of building a steam engine which should produce 3 hp
> at 500 rpms which will need a 15 inch by 22 pitch propeller.
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