40339Re: design ideas
- Nov 2, 2004Thanks for that, Jeff. I'll have a look at that site. Maybe it will
lead me to an answer to questions as to: 1) how deeply do the blades
need to be immersed and 2) whether they should be mounted radially,
or tilted slightly. Radial mounting seems to be almost universal.
Recently I saw an interesting TV program about early ocean-going
paddlesteamers. I was aware of the problem of varying blade immersion
as waves move along along the hull or as displacement varies, but
hadn't considered that there is a steering problem when there are
transverse waves, which cause alternate paddles to push harder. I.K.
Brunel solution was to use fore-and-aft sails to limit the boat's
roll and thus make paddle immersion more constant.
No wonder the screw propellor quickly became almost universal, except
for a few cases like the one you describe, Jeff, or for passenger
boats on calm lakes.
--- In firstname.lastname@example.org, "Jeff" <boatbuilding@g...> wrote:
> Here's a good site to start with
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