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01-08-2007, 07:59 PM
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Join Date: Jun 2006
Location: Ottawa, Ontario, Canada
Posts: 2,116
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ribs alclad?
Are wing ribs alclad? They have a duller finish than the rear spar and the skins, which is why I'm in doubt. If not Alclad, must they absolutely be primed? My strategy (not intending to open this debate here) has been to prime mating surfaces only.
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Phil
RV9A (SB)
Flying since July 2010!
Ottawa, Canada
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01-08-2007, 08:11 PM
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Join Date: Mar 2006
Location: Grand Rapids MI
Posts: 742
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They are alclad.
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01-08-2007, 09:22 PM
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Join Date: Aug 2005
Location: Pasadena CA
Posts: 2,484
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I prime those bad boys anyway... Maybe just cause it looks better.
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Stephen Samuelian, CFII, A&P IA, CTO
RV4 wing in Jig @ KPOC
RV7 emp built
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01-09-2007, 06:46 AM
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Join Date: Jun 2006
Location: Ottawa, Ontario, Canada
Posts: 2,116
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Why do the ribs have a duller finish than other aluminum components (skins, spars)? What is different about the material?
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Phil
RV9A (SB)
Flying since July 2010!
Ottawa, Canada
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01-09-2007, 06:55 AM
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Join Date: Nov 2005
Location: Tellico Plains, TN
Posts: 561
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I'm not dead sure, but it seems like I read somewhere that they aren't heat treated until after they're formed. If that's true, it would stand to reason that it could change the appearance a bit. I'm not sure what (if anything) that does to the alclad's ability to resist corrosion.
Cheers,
Rusty
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RV-8, SN-80587, built, flown, sold.
RV-3B, SN-10751, rotary engine, built, flown, sold
RV-8, SN-82470, built, flown, sold.
RV-3B, SN-11351, purchased, , flown, sold
A&P - 2018
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01-09-2007, 07:16 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,762
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Rusty is correct. The dull color is caused by heat treating after forming. They ARE alclad.
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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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01-09-2007, 08:12 AM
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Join Date: Jan 2005
Location: Atlanta, GA
Posts: 2,295
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Here's a dumb question from someone who never scratch-built an airplane before....
Why are the ribs heat treated? To harden them, soften them or what?
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"What kind of man would live where there is no daring? I don't believe in taking foolish chances but nothing can be accomplished without taking any chance at all." - Charles A. Lindbergh
Jamie | RV-7A First Flight: 7/27/2007 (Sold)
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01-09-2007, 08:26 AM
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Join Date: Jan 2005
Location: Woodstock, Ga
Posts: 117
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Quote:
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Originally Posted by Jamie
Here's a dumb question from someone who never scratch-built an airplane before....
Why are the ribs heat treated? To harden them, soften them or what?
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No such thing as a "dumb" question (except for the one that's not asked)!
The ribs are made from "0" material, which is very soft and easily formed. After forming they are heat treated to harden them to a T3 or T4 temper for strength. The heat treating dulls the alclad, but doesn't affect it's corrosion resistance.
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Rod Schneider
Ball Ground, GA
RV6/Subaru
Flying!
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01-09-2007, 09:11 AM
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Join Date: Jan 2005
Location: Lake St. Louis, MO.
Posts: 2,346
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I'm a bit confused. Just reviewed "The RV Story" and Ken Scott says and I quote: ".....ribs are heat treated and press formed." That statement would suggest to me the material is heat treated before forming. So which is it....before or after?
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Rick Galati
RV6A N307R"Darla!"
RV-8 N308R "LuLu"
EAA Technical Counselor
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01-09-2007, 12:16 PM
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Join Date: Jan 2005
Location: Woodstock, Ga
Posts: 117
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The ribs (and several other parts, bulkheads, etc) would be formed before being heat treated, otherwise the metal would crack during forming.
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Rod Schneider
Ball Ground, GA
RV6/Subaru
Flying!
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