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CATTCO PROPS 3 Vs 2

 
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flyadive(at)gmail.com
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PostPosted: Thu Jul 29, 2010 1:33 pm    Post subject: CATTCO PROPS 3 Vs 2 Reply with quote

Hello Gaggle:

I am looking for some information on CATTCO PROPS.

This is their web site:

http://www.cattoprops.com/index.html

Is anyone using their props?

Info needed is:
Three Blade Prop Vs Two Blade Prop.
Is a 54" Pitch CATTCO equivalent to a 62" Pitch Sensinich?
Why is there so much of a difference in pitch call-out between the two?
I say this because a 54" is what was recommended / suggested Vs a 62".
I did some basic calculations and for the same engine and going from a two blade to a three blade the pitch should be closer to a 60".
I do not want a climb prop - I want a cruse prop.

Does anyone have a spread sheet program or a web site for doing calculations?


ANY IDEAS?

Thanks Gaggle-

Barry [quote][b]


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rickofudall



Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

PostPosted: Thu Jul 29, 2010 3:03 pm    Post subject: CATTCO PROPS 3 Vs 2 Reply with quote

When it comes to prop carvers they are free to call out there measurements as they choose. One carver may chose to measure at 75% of diameter, another may choose 70%, one may choose to use a flat bottom airfoil section and use the bottom as the reference plane while another might use the true chord of the airfoil. People I know who buy carved props generally have a collection and some are reshaped more than once in the search for that perfect prop.
When I was building a LongEZ I bought a Carver prop that was supposed to be just the ticket. It had been specially run through Don Bates' Prop Optimizer program by Bates himself. I sold it to a friend who mounted it on his O-235 powered Varieze. He liked it, it was faster than the prop he was running but he got itchy for a little more performance and sent it back to Carver. The company had changed hands and the new guys worked it over pretty good because when Mike got it back his Varieze was instantly 40 MPH faster. Go figure.
Craig Catto, Gary Hertzler, and others offer great products, but you may have to work with them to get exactly what you want. Just put it down to another aspect of your experiment.
Rick Girard

On Thu, Jul 29, 2010 at 4:32 PM, FLYaDIVE <flyadive(at)gmail.com (flyadive(at)gmail.com)> wrote:
[quote] Hello Gaggle:

I am looking for some information on CATTCO PROPS.

This is their web site:

http://www.cattoprops.com/index.html

Is anyone using their props?

Info needed is:
Three Blade Prop Vs Two Blade Prop.
Is a 54" Pitch CATTCO equivalent to a 62" Pitch Sensinich?
Why is there so much of a difference in pitch call-out between the two?
I say this because a 54" is what was recommended / suggested Vs a 62".
I did some basic calculations and for the same engine and going from a two blade to a three blade the pitch should be closer to a 60".
I do not want a climb prop - I want a cruse prop.

Does anyone have a spread sheet program or a web site for doing calculations?


ANY IDEAS?

Thanks Gaggle-

Barry
Quote:


ist" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution

[b]


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PostPosted: Fri Jul 30, 2010 4:27 am    Post subject: CATTCO PROPS 3 Vs 2 Reply with quote

Barry, I installed a three blade Catto prop on my RV-8A back in 2003. I sold the plane last fall after 450 hours. The prop performed
great for me. The only problem with the 3 blade was that it made the cowl harder to remove than with a two blade prop.

Walt Shipley

---


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flyadive(at)gmail.com
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PostPosted: Fri Jul 30, 2010 5:38 am    Post subject: CATTCO PROPS 3 Vs 2 Reply with quote

Rick:

Thank you for the post... As you say; is as I figured.

They all play their games to make their common product exclusive.

Thanks Rick,

Barry
On Thu, Jul 29, 2010 at 7:02 PM, Richard Girard <aslsa.rng(at)gmail.com (aslsa.rng(at)gmail.com)> wrote:
[quote]When it comes to prop carvers they are free to call out there measurements as they choose. One carver may chose to measure at 75% of diameter, another may choose 70%, one may choose to use a flat bottom airfoil section and use the bottom as the reference plane while another might use the true chord of the airfoil. People I know who buy carved props generally have a collection and some are reshaped more than once in the search for that perfect prop.
When I was building a LongEZ I bought a Carver prop that was supposed to be just the ticket. It had been specially run through Don Bates' Prop Optimizer program by Bates himself. I sold it to a friend who mounted it on his O-235 powered Varieze. He liked it, it was faster than the prop he was running but he got itchy for a little more performance and sent it back to Carver. The company had changed hands and the new guys worked it over pretty good because when Mike got it back his Varieze was instantly 40 MPH faster. Go figure.
Craig Catto, Gary Hertzler, and others offer great products, but you may have to work with them to get exactly what you want. Just put it down to another aspect of your experiment.


Rick Girard

On Thu, Jul 29, 2010 at 4:32 PM, FLYaDIVE <flyadive(at)gmail.com (flyadive(at)gmail.com)> wrote:

Quote:
Hello Gaggle:

I am looking for some information on CATTCO PROPS.

This is their web site:

http://www.cattoprops.com/index.html

Is anyone using their props?

Info needed is:
Three Blade Prop Vs Two Blade Prop.
Is a 54" Pitch CATTCO equivalent to a 62" Pitch Sensinich?
Why is there so much of a difference in pitch call-out between the two?
I say this because a 54" is what was recommended / suggested Vs a 62".
I did some basic calculations and for the same engine and going from a two blade to a three blade the pitch should be closer to a 60".
I do not want a climb prop - I want a cruse prop.

Does anyone have a spread sheet program or a web site for doing calculations?


ANY IDEAS?

Thanks Gaggle-

Barry
Quote:


ist" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution



Quote:


ist" target="_blank">http://www.matronics.com/Navigator?RotaxEngines-List
ttp://forums.matronics.com
_blank">http://www.matronics.com/contribution



[b]


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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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