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How to calculate a prop's diameter and pitch?

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How to calculate a prop's diameter and pitch?

Old 02-07-2005, 03:07 PM
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desertbuzz
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Default How to calculate a prop's diameter and pitch?

I have a few props laying around, and I wanted to know how to calculate their diameter and pitch....
Show me the way... through the darkness of prop world.
Old 02-07-2005, 03:44 PM
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Zac Price
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Default RE: How to calculate a prop's diameter and pitch?

Here is a link to Jims. Mike T sells the prop gauge needed to measure pitch. [link=http://p086.ezboard.com/fjimsrcboatdockfrm11.showMessage?topicID=13.topic]T-Mod tools[/link]
Old 02-07-2005, 04:20 PM
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desertbuzz
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Default RE: How to calculate a prop's diameter and pitch?

Thanks Zac,

But I'm located ... a bit far away from Richmond/Virginia.
isn't there another way?
Old 02-07-2005, 06:32 PM
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Zac Price
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Default RE: How to calculate a prop's diameter and pitch?

I am no prop guru, sorry. I do know that the big boys use a prop gauge to measure pitch. Diameter (I assume) is how big it is around. Some props have a variable pitch, how all that is figured I can't say. I do know that pitch is measured like this:
4.8" pitch =s 4.8" of travel per revelation of the prop (not counting slip)
Old 02-08-2005, 12:15 AM
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Ron Olson
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Default RE: How to calculate a prop's diameter and pitch?

Zac hit it pretty close. what we run into is you can get the diameter easy enough, most are in metric sizes because it's easier to do the math on them. Look for any numbers at all on the hub of the prop, that narrows thing down really fast. Some companies make props in the same diameter but with different pitches and applications. Some have a constant pitch and others a progressive pitch. There are lifting, low-lift and non-lifting props. This is why the numbers on a prop hub are so important, especially for us that do not own pitch guages.
Here's a little light but not much.
An example. Octura uses "X" to denote a low-lift prop. The next number such as a "4" shows that the pitch is 1.4 times the diameter of the prop which is the last two numbers. An X-437 would have a diameter of 37mm and a pitch of 51.8mm . If it has a 14, 16, 19, etc. before the last two numbers then it is a lifting prop. now use the 1.4, 1.6, 1.9 times the diameter to find the pitch.
Old 02-08-2005, 01:03 PM
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desertbuzz
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Default RE: How to calculate a prop's diameter and pitch?

Found an excellent application (excel) used to calculate prop diam, pitch and much more

http://www.alberg30.org/maintenance/...r/propcalc.xls


hope you like it
Old 02-08-2005, 05:00 PM
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Zac Price
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Default RE: How to calculate a prop's diameter and pitch?

Another cool link
[link=http://www.props4u.com/prop_chart.htm]Props 4 U[/link]

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