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Cox Engine of The Month
December-2024
roddie's

".049 reed-valve marine conversion"

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Post  jbanes1961 Wed Nov 06, 2019 9:18 am

I have a prop, but it doesnt appear to have any markings on it. How do I know if I have it on right. I really dont know anything about propellers or the theory of operation.
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Post  1/2A Nut Wed Nov 06, 2019 1:10 pm

Post a photo of it we can tell you what you have.
Measure the length too.

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Post  jbanes1961 Wed Nov 06, 2019 5:27 pm

Ok, prop is 4-7/8 from tip to tip. It says thimble drone on it, and has designations 5D and 3P. Havent been able to figure out how to get a photo in this post, but if its important, I will try to cypher it out
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Post  jbanes1961 Wed Nov 06, 2019 5:57 pm

[img]https://i.servimg.com/u/f65/20/13/23/89/20191115.jpg[/]

Propellers 20191115
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Post  jbanes1961 Wed Nov 06, 2019 5:59 pm

Propellers 20191116
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Post  jbanes1961 Wed Nov 06, 2019 5:59 pm

Yay
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Post  Levent Suberk Wed Nov 06, 2019 6:42 pm

It is 5" diameter, 3" pitch RH (Right Hand) propeller:

https://coxengines.ca/cox-.049-propeller-5-x-3.html
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Post  1/2A Nut Wed Nov 06, 2019 6:46 pm

5D x 3P

Five inch dia. x 3 inch pitch

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Post  jbanes1961 Wed Nov 06, 2019 8:32 pm

Ok thank you. Appreciate info
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Post  dirk gently Thu Nov 07, 2019 2:07 am

jbanes1961 wrote: How do I know if I have it on right.
The markings (like "5D 3P", in this case) are always on the front of the prop (or the "suck" side, if you will). The convex , sorry, I meant concave Embarassed side of the blades faces the back of the plane, as that's the "blow" side of the prop.
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Post  jbanes1961 Thu Nov 07, 2019 5:49 am

Thank you Dirk, that explains things nicely. I did a little reading on props and how they work, so I have a little better understanding of the mechanics of it. I guess I should have done that first, before posting, but I really enjoy the down to earth feedback I get from the members. Once again thanks for all the help. Jeff
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