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07-27-2016, 12:53 AM
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Join Date: Jul 2006
Location: San Jose, CA
Posts: 35
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Catto Propeller Installation Torques
I just received my brand new Catto 3-Blade Propeller, 7"diameter crush plate... 1/2" diameter bolts. There is no install torque for the propeller... Nothing stamped on the hub. I do have the install-torque for the 2.25" spacer to engine from Saber Company...Does any one know the torque for the crush plate and propeller???
The Catto's are MIA in Oshkosh and can't be reached until after Osh is over, so I'm essentially dead in the water for the installation until then...
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07-27-2016, 05:22 AM
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Join Date: Apr 2012
Location: Collierville, TN (KFYE)
Posts: 1,433
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You should have received some instructions with the saber hub, as well as the installation bolts...as I recall, the torque specs were on those instructions. Torque has to do with the bolts, not the prop
__________________
RV-8 #81077 Super Slow Build
Dynon Skyview HDX, Titan IOX-370, Dual P-Mags, AFP FM200A FI, Whirlwind 200RV CS Prop
First Flight 11/20/2016
www.marksrv8.com
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07-27-2016, 07:34 AM
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Join Date: Sep 2008
Location: California
Posts: 697
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Quote:
Originally Posted by Mark Dickens
Torque has to do with the bolts, not the prop
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This applies to the extension and hub. Use the standard torque for that size bolt in a metal to metal assembly.
Catto has his own torques for the prop that definitely have to do with the prop. IIRC (!) on 1/2” bolts he recommends 42 pounds, and 7/16” 35 pounds. But I'd check with them. He did a BUNCH of testing and research recently and found a lot of props torqued wrong and close to failure with charred hubs from friction burns!
Last edited by flyingriki : 07-27-2016 at 07:43 AM.
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07-27-2016, 07:37 AM
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Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,183
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Saber has guidelines on their site.
http://sabermfg.com/faq.htm
EDIT: but not for the prop bolts 
__________________
Ray
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines (aka Hoser)
Last edited by Raymo : 07-27-2016 at 07:40 AM.
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07-27-2016, 08:16 AM
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Join Date: Jul 2007
Location: Cypress, TX
Posts: 524
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On the prop
If I recall correctly, the prop torque numbers are on the prop label along with pitch, diameter, date of manufacture, etc.
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07-27-2016, 08:25 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,761
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Quote:
Originally Posted by brad walton
If I recall correctly, the prop torque numbers are on the prop label along with pitch, diameter, date of manufacture, etc.
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They are on mine!
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Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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07-27-2016, 09:04 AM
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Join Date: Aug 2010
Location: Wichita, KS
Posts: 1,957
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The torque spec is on the label of mine too. If there's none listed on the label of your prop, check with Catto. Craig and Nicole are at Oshkosh this week, so be patient if you can.
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Kurt W.
RV9A
FLYING!!!
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07-27-2016, 09:26 AM
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Join Date: Mar 2006
Posts: 629
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Catto Torque
My data plate (2015 carbon/glass 3 blade composite for 180hp/360) shows 40 ft lbs. One half inch bolts.
Cheers,
db
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Dave B.
RV9a/ECiIO360/James Cowl/WW RV200 Prop
Flying since 3/06 and still smiling!!! 
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07-27-2016, 11:09 AM
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Join Date: Mar 2014
Location: Laguna Hills, CA
Posts: 1,805
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It wasn't listed on the Saber FAQ link, but my instructions of the 2.25 extension said to use blue LocTite on the bolts.
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Doug
RV-9A "slider"
Flew to Osh in 2017, 2018 & 2019!
Tail number N427DK
Donation made for 2020
You haven't seen a tree until you've seen its shadow from the sky -- Amelia Earhart
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07-27-2016, 03:42 PM
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Join Date: Dec 2005
Location: Mahomet, Illinois
Posts: 2,195
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The data plate for my Catto 3-blade (68/70) says 38lbs. Mine has 7/16" bolts, that came from Saber with blue Loctite-like material already on them.
__________________
Terry Ruprecht
RV-9A Tip-up; IO-320 D2A
S. James cowl/plenum
(Dues paid thru Nov '18)
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