Reducing TE cup on 19deg-38bar abc

[Alan Elzer]

Alan, the first I bought years ago at Lowe’s and were Dremel. In recent times I get them from McMaster Carr.
Thanks John

John whats the width & diameter of those from McMaster

 

[John Beardslee]

John whats the width & diameter of those from McMaster

Alan,
3/16” width, 1-3/16” dia. , 1/8” shank and 80 grit. Mine are by Merrit and safe to 30,000 rpm.
John

 

[Mike Hughes]

Sanders | McMaster-Carr

Here is a link Alan

 

[Danny King]

Alan,
3/16” width, 1-3/16” dia. , 1/8” shank and 80 grit. Mine are by Merrit and safe to 30,000 rpm.
John

Great example of a photo being deceiving. At first glance anyways. Lol

 

[John Beardslee]

Great example of a photo being deceiving. At first glance anyways. Lol

Danny, didn’t mean to be deceiving, explain please. Thanks John

 

[John Beardslee]

Here’s some pics of what I use. FYI, my hands have have surgeries and I know Mark and others use different tools but this works for me. These are the adjustable wrenches I use and the anvil I use to work props.

 

[John Beardslee]

Here’s some pics of what I use. FYI, my hands have have surgeries and I know Mark and others use different tools but this works for me. These are the adjustable wrenches I use and the anvil I use to work props.View attachment 291004View attachment 291004

 

[Danny King]

Danny, didn’t mean to be deceiving, explain please. Thanks John

You weren’t John. At first glance it seemed the flapper wheel was much bigger then the actual dimensions. Nothing you did.

 

[John Beardslee]

You weren’t John. At first glance it seemed the flapper wheel was much bigger then the actual dimensions. Nothing you did.

Thanks Danny, as you know you can send me any prop you have and I will work it to best of my ability. The garuntee is 5 feet or five seconds which ever comes first!!!
Thanks John

 

[Wasted wages]

I knew a guy that used some sort of dental material to mold a prop once he was satisfied with the way it worked....his wife got it from a place she worked..... it hardened enough so that he could hammer on it..... I remember he had some 1667 molds that were awesome!!

 

[Mike Hughes]

I knew a guy that used some sort of dental material to mold a prop once he was satisfied with the way it worked....his wife got it from a place she worked..... it hardened enough so that he could hammer on it..... I remember he had some 1667 molds that were awesome!!

You can do that same thing with a 2 part puddy that I got from west mariine. I have made prop molds with it. I just mount a shaft in a block of wood. Then spray prop with WD40. Then mix up the puddy and shape it to fit the blade area. Works awesome. It is the old school to make prop duplicators. Here is a link to a simialr product to what I use.
https://www.amazon.com/4oz-Epoxy-Pu...59CVP55MHA6S&refRID=TG2T44C059CVP55MHA6S&th=1

 

[dwilfong]

Guys you can not play with the 38 bar props like the old Octura props. When I get the time I will post some things I found out about the 38 bar props. Thy only have a few blade pitch profiles and use the boost pitch to come up with the pitch ratios. Yes BOOST pitch not cup. Get cup out of your mind when you talk about the 38 bar props.

 

[John Beardslee]

Guys you can not play with the 38 bar props like the old Octura props. When I get the time I will post some things I found out about the 38 bar props. Thy only have a few blade pitch profiles and use the boost pitch to come up with the pitch ratios. Yes BOOST pitch not cup. Get cup out of your mind when you talk about the 38 bar props.

Hummmmmm? Want to bet on it? I’m kinda new to this stuff but the old principles still apply, not sure how you used to work Octura props but the way I used to still seems to work for me.

 

[dwilfong]

See I got you thinking now did I not?

 

[John Beardslee]

See I got you thinking now did I not?

I think you need a vacation! Something where you go swimming in a high mountain stream! So when you’re as old as me you’ll have great memories of fishing trips in the high country.

 

[John Beardslee]

Yup, I’m jealous, it’s been many years since my last trip to the Bow!

 

[dwilfong]

Yep got a few Octura guys thinking different. Open your mind and throw away what you have learned.
Thy are not the same animal .
Not saying thy are better just different.
What where thy called?
GAME CHANGER?
Yes thy are a game changer.

 

[dwilfong]

Yup, I’m jealous, it’s been many years since my last trip to the Bow!

Staying at the Dalenback ranch in a cabin right on the river. Will contemplate the next move with the wisdom that I do not know it all yet.

 

[shoboat]

Guys,

If you really want to know what makes the Newer ABC propellers better, just start measuring the leading edge pitch about 30% up the leading edge.
You will find the Newer ABC propellers have more leading edge pitch in them compared to the same size and pitch ratio of the older ABC and Octura propellers. The nicest part is that you now have choices of: rake angle, pitch ratios, and blade areas. Much better to dial in a boat with a few hundred more computer designed blades to choose from.
We also have found if you bend on them you change the rake angle of the blades and it will slow the boat down some. This is why I choose to grind the blades instead of sanding them.
3M EXL 2SFN unitized wheels do a beautiful job just like the pros use in their shops.

Thanks Jim Schaefer,

Mark Sholund

 

[dwilfong]

Mark check the blade after the 5 deg boost pitch on the 38 bar 21 and 22 diameter props and tell me what you find.
Then check just the 5 deg before the trailing edge and calculate the pitch ratio and tell me what you find?