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Old 01-21-2013, 07:39 PM   #21
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Wrong thread but HaHaHa
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Old 01-21-2013, 10:46 PM   #22
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I got the following numbers from a commercial propeller manufacturer:

10% up to 1000 RPM.
20% between 1000 Ė 1500 RPM.
24% above 1500 RPM.

Minimum 3% to the protective keel shoe/heel/aperture skeg or whatever the correct name is.
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Old 01-22-2013, 05:02 PM   #23
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Haha all,

I see you're on BoatDesign too RT. I saw that bicycle w the drums on BD. Now I wonder how many places you are that I haven't discovered yet. Fun to come.

Rick,
200 years??? Wow. Would never have thunk. OK I guess that takes that one out of the fad category. Good thing I have you guys around or I'd get in all kinds of trouble.

So how'ed we get to "wheel" for propeller? If it happened 200 years ago it probably came from paddle WHEELS. And they just transferred it over to propellers. But not a fad. Ride for car is a fad though. They are even using it in ads for Ford cars now. Anything to be vogue .. cute.

One thing I like about my Willard is it's got lots of prop clearance.
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Old 01-23-2013, 03:53 PM   #24
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Quote:
Originally Posted by manyboats View Post
I've thought that was kinda silly. What's wrong w propeller? Where did did we start calling props wheels? We talk a lot about efficiency and having multiple words for the same thing seems inefficient to me. A lot of people call cars rides now and it's stupid as the word car is WELL established. I think most or even all of this is just one little fad after another. Stupid stupid stupid as John Grisham said in his book The Client.
My dad designed "screws" in Belfast and Glasgow in the 60's. I have to work at it to use the word "propeller".
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Old 01-24-2013, 10:49 PM   #25
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My Dad called a prop a wheel when he was in the Navy and that was over 60 years ago.
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Old 01-24-2013, 10:59 PM   #26
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I've used the word "wheel" for propeller for a long time too. When in Rome do .... just trying to communicate. I know wheel isn't a new fad but why and how did it get started in the first place? I think boaters like to use the word wheel as it establishes their nauticalness among boaters. After all everybody knows what a propeller is. I think that's probably why we use it but how did it get started. Nobody commented on my paddle wheel theory ... then what??
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Old 01-25-2013, 06:21 AM   #27
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To the best of my knowledge, the term wheel as applied to a screw propeller is derived from the paddlewheel as the device that converts rotary motion to movement through the water.
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Old 01-25-2013, 07:36 AM   #28
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Here's another guys cut on the topic...

And by the way - Guys .... "Propellers" are called = "Wheels" in Workboats, a term from steamboat days that's still respectfully used by Tradition.

And here's Propeller 101 for a bit beyond the very basic.....at least one version of it...


http://www.vicprop.com/propeller101.htm
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Old 01-25-2013, 10:57 AM   #29
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Well being a non-traditional type I think I'll switch back to propeller. Frequently people aren't familiar w wheel but everyone knows propeller. Most propeller shops are called Prop shops. OK good.
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Old 02-03-2013, 12:46 AM   #30
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I dunno, I like "screw".
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Old 02-04-2013, 12:00 PM   #31
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Maybe it's a propeller on a airplane & a wheel on a boat,
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Old 02-04-2013, 12:46 PM   #32
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If it is a twin screw. Is that getting some twice?
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Old 02-04-2013, 01:53 PM   #33
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I'm think'in the prop clearance should be more w a lot of pitch and since our trawlers generally have little pitch we could get by w less clearance. Also most trawlers are built heavier and would suffer less form the noise generation from the hull vibrating.
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Old 02-14-2013, 01:19 AM   #34
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Prop scew is another factor: more scew means less prop beating on the hull, so clearances can be smaller...
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