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  #1  
Old 03-15-2012, 03:57 PM
RV8R999 RV8R999 is offline
 
Join Date: Dec 2008
Location: na
Posts: 1,457
Default Catto 3-Blade vs Sensenich Wood

When I built my -8 a year and half ago I installed a wood sensenich 2-blade prope 71" dia pitched to 83. I really liked the look of the wood prop and was very happy with the performance but happy is a relative term and often elusive so....

Today I installed a new Catto 3-blade 68" dia, pitched 75. I entered myself back into a 5 hour phase 1 test period and am not notifying the FSDO.

Here is a pic:


Several flights were conducted with both props at a Weight/Delta of 1800lbs. The OAT and fuel burn were noted for each data point and the altitude adjusted to account for decrease in weight as the flight progressed - altitude increases with decreasing weight to remain at the same Weight/delta of 1800lbs.

Once the Catto was installed I flew several flights at two differenct Gross Weights with (400lb delta) to highlight the advantage of this test technique. The plots below show an average of 3 runs with the Sensenich, and averages of 3 runs each for the Catto at 1700lbs and 1300lbs. - note the data for the two averaged Catto runs line up nicely. I'll refly this profile at 3 different Weight/Delta Values (2000, 2200, 1500). This will provide a family of 4 level flight curves. Linear regression will allow building actual performance charts at any gross weight and DA from those...



I'll let you guys chew on the data above for awhile...

Other info:

1 - Catto Prop climb rate was 200 FPM greater than the Sensenich through a 1000ft altitude band, WOT at Vy (110mph), 4000-5000ft AP at 62 deg F at a Gross weight of 1546lbs and was 1306FPM
2 - Sound dramatically decreased (almost eerie)
3 - Vibrations through entire speed sweep were noticeably lower
4 - T/O distance was improved by 200 ft
5 - CHT in climb were significantly cooler (I'm still crunching data on this so no numbers yet)
6 - Cost: Sensenich $1600 + Spinner Kit, Catto - $3000 w/ Spinner Kit
7 - Delivery time: Sensenich: 6wks, Catto almost 12 weeks
8 - The Prop Disk is invisible in flight at RPM above 1400. The sensenich was always visible and distracting.
9 - Installation/Removal of Cowl is much more difficult but doable. I have slightly less than 1/8" gap between cowl and spinner so this is part of it.
9 - My GF says "The plane looks much sexier now!" this is the most important data point of all!!

Last edited by RV8R999 : 03-17-2012 at 10:51 AM. Reason: new data
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  #2  
Old 03-15-2012, 04:31 PM
FORANE's Avatar
FORANE FORANE is offline
 
Join Date: Nov 2011
Location: East TN
Posts: 627
Default

Whats the current wait time between date of order and date of delivery for Catto?
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  #3  
Old 03-15-2012, 05:25 PM
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Rhino889 Rhino889 is offline
 
Join Date: Dec 2009
Location: Jupiter FL.
Posts: 451
Default

Ken,

Is that white tips? If so, Craig sent you my prop!

I ordered the exact prop 2 weeks ago...

Looks great!
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  #4  
Old 03-16-2012, 09:55 AM
RV8R999 RV8R999 is offline
 
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Default

Quote:
Originally Posted by Rhino889 View Post
Ken,

Is that white tips? If so, Craig sent you my prop!

I ordered the exact prop 2 weeks ago...

Looks great!
Nope - yellow tips!

I ordered mine last November and just received it yesterday! Nearly 4 months!!
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  #5  
Old 03-17-2012, 06:39 AM
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Rhino889 Rhino889 is offline
 
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Location: Jupiter FL.
Posts: 451
Default

Quote:
Originally Posted by RV8R999 View Post
Nope - yellow tips!

I ordered mine last November and just received it yesterday! Nearly 4 months!!
Ewww, Not good news for me!

Couldn't see the color well with the camera angle... yellow tips look great.

Congrats on the new prop,

Scott
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VAF DUES 7/13, 12/13, 03/14
Founder/Director
www.Aircraftwraps.com
Replace paint with performance.

This is my personal account and does not reflect the official communications of Aircraftwraps.com. We have retained a username for such correspondence. I post about formation, eating, aerobatics and pilot stuff .
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  #6  
Old 03-17-2012, 10:56 AM
RV8R999 RV8R999 is offline
 
Join Date: Dec 2008
Location: na
Posts: 1,457
Default Flight Test Data

When I built my -8 a year and half ago I installed a wood sensenich 2-blade prope 71" dia pitched to 83. I really liked the look of the wood prop and was very happy with the performance but happy is a relative term and often elusive so....

Today I installed a new Catto 3-blade 68" dia, pitched 75. I entered myself back into a 5 hour phase 1 test period and am not notifying the FSDO.

Here is a pic:



Several flights were conducted with both props at a Weight/Delta of 1800lbs. The OAT and fuel burn were noted for each data point and the altitude adjusted to account for decrease in weight as the flight progressed - altitude increases with decreasing weight to remain at the same Weight/delta of 1800lbs.

Once the Catto was installed I flew several flights at two differenct Gross Weights with (400lb delta) to highlight the advantage of this test technique. The plots below show an average of 3 runs with the Sensenich, and averages of 3 runs each for the Catto at 1700lbs and 1300lbs. - note the data for the two averaged Catto runs line up nicely. I'll refly this profile at 3 different Weight/Delta Values (2000, 2200, 1500). This will provide a family of 4 level flight curves. Linear regression will allow building actual performance charts at any gross weight and DA from those...



I'll let you guys chew on the data above for awhile...

Other info:

1 - Catto Prop climb rate was 200 FPM greater than the Sensenich through a 1000ft altitude band, WOT at Vy (110mph), 4000-5000ft AP at 62 deg F at a Gross weight of 1546lbs and was 1306FPM
2 - Sound dramatically decreased (almost eerie)
3 - Vibrations through entire speed sweep were noticeably lower
4 - T/O distance was improved by 200 ft
5 - CHT in climb were significantly cooler (I'm still crunching data on this so no numbers yet)
6 - Cost: Sensenich $1600 + Spinner Kit, Catto - $3000 w/ Spinner Kit
7 - Delivery time: Sensenich: 6wks, Catto almost 12 weeks
8 - The Prop Disk is invisible in flight at RPM above 1400. The sensenich was always visible and distracting.
9 - Installation/Removal of Cowl is much more difficult but doable. I have slightly less than 1/8" gap between cowl and spinner so this is part of it.
9 - My GF says "The plane looks much sexier now!" this is the most important data point of all!!
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  #7  
Old 03-15-2012, 10:31 PM
sandifer sandifer is offline
 
Join Date: Jan 2007
Location: NC
Posts: 667
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Quote:
Originally Posted by FORANE View Post
Whats the current wait time between date of order and date of delivery for Catto?
Seems to vary quite a bit. Craig says typically 4-6 weeks, but I've been waiting on mine for 13 weeks. Should be any day now. I think he runs them in batches that are similar, so lead times vary. I've heard of folks waiting a lot longer. But I also have a friend who got his in 2 weeks because he had an urgent need. Can't wait for mine.
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  #8  
Old 03-16-2012, 07:19 AM
N208ET N208ET is offline
 
Join Date: May 2007
Location: St. Helens OR
Posts: 433
Default My Catto 3 blade should be here today

I just checked the fedex tracking and it is due today. I am switching from a metal sensenich to a catto 3 blade, the sensy being a cruise prop, the catto a climb cruise combo, should be interesting.

Randy
8A
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  #9  
Old 03-17-2012, 07:46 PM
dealfair dealfair is offline
 
Join Date: Feb 2006
Location: George West, TX
Posts: 567
Default Ha Ha!!

Quote:
Originally Posted by RV8R999 View Post
Other info:

9 - My GF says "The plane looks much sexier now!" this is the most important data point of all!!
THAT, is the exact reason I bought a Catto 3 blade prop!!! No regrets.
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RV-4 (N34CB)
George West, TX (8T6)
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  #10  
Old 03-17-2012, 09:18 PM
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kevinsrv7.com kevinsrv7.com is offline
 
Join Date: Aug 2006
Posts: 167
Default Weight differences

Ken nice prop, what was the difference in weight between the two props?
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