The Murphy Builders Site

Posted: **Sat Feb 18, 2012 9:50 am**

I was putting together my 1000th order with Aircraft Spruce and noticed that
they don't sell alclad 6061. Only 2024 is available alclad. Am I mistaken.
Isn't alclad 6061 most of what MAM provides? Does anyone know if MAM
provides T4 or T6 6061? OK, why don't I get to the bottom line. I want to
buy the best stuff for my cowl. Alclad 6061T6 because of 6061's better
corrosion resistance, and the T6 is the highest level of conditioning
(hardest tempering)? But 2024 is supposed to be better for fatigue
resistance. Watcha think? 2024 or 6061? Just annealed or heat treated as
well? Since heat treating hardens the metal does that reduce fatigue
resistance? Perhaps the alclad 2024T3 would be best since it is best for
fatigue resistance, is only moderately hardened, and the alclad improves
corrosion resistance.

Lastly, I can get sheets rolled and shipped normally (i.e., not freight) up
to 0.032 thickness. I was planning on using 0.025. I figured on four 3 X 4
foot pieces for each of the four cowl panels. Sound about right?

Mike Kimball (being picky)
044SR

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Posted: **Sat Feb 18, 2012 9:50 am**

Mike...6061 generally comes in "bare" state only. It is not alcad'd like
2024 to protect the pure metals in 2024. What MAM ships and what is readily
availabe it 6061-T6 Bare.

As for what to make the cowling doors out of...probably not a big difference
going either way (other than 2024 is double the price!). My doors are 2024
T3 and only because that is what MAM supplied in the fwf kit for the O-235
at the time in 1993. Others I've had in the yard have 6061-T6 doors and
don't/didn't exhibit any signs of fatigue.

Can't help you on the sizes you need.

Cheers,
Wayne

----- Original Message -----
From: "Mike Kimball" <mkimball@gci.net>
To: "Rebel List" <rebel-builders@dcsol.com>
Sent: Saturday, December 11, 2004 3:29 PM
Subject: Alclad 6061?

I was putting together my 1000th order with Aircraft Spruce and noticed

that

they don't sell alclad 6061. Only 2024 is available alclad. Am I

mistaken.

Isn't alclad 6061 most of what MAM provides? Does anyone know if MAM
provides T4 or T6 6061? OK, why don't I get to the bottom line. I want

to

buy the best stuff for my cowl. Alclad 6061T6 because of 6061's better
corrosion resistance, and the T6 is the highest level of conditioning
(hardest tempering)? But 2024 is supposed to be better for fatigue
resistance. Watcha think? 2024 or 6061? Just annealed or heat treated

as

well? Since heat treating hardens the metal does that reduce fatigue
resistance? Perhaps the alclad 2024T3 would be best since it is best for
fatigue resistance, is only moderately hardened, and the alclad improves
corrosion resistance.

Lastly, I can get sheets rolled and shipped normally (i.e., not freight)

up

to 0.032 thickness. I was planning on using 0.025. I figured on four 3 X

4

foot pieces for each of the four cowl panels. Sound about right?

Mike Kimball (being picky)
044SR

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Posted: **Sat Feb 18, 2012 9:50 am**

G'day Mike ;

6061 is NOT an "alclad" aluminium - because it doesn't need to be !
..... 2024 IS because it has crappy corrosion properties & the "alclad"
gives it a skin of resistant aluminium to protect the underlying - more
exotic mixture.

YES ... 2024 IS stronger than 6061 .... but MAM designed their a/c
around the strength characteristics of 6061 .... and 6061 is an
"exterior grade" alloy ... they make aluminium truck bodies / chassis
out of 6061 ... but they don't make 'em out of 2024 !

Rick Harper
541R

PS I'm not a nerd speller .... "Aluminium" is what the whole WORLD
(minus America) calls it .... because that IS its name ... discovered by
a French chemist in 1825 - refined to basically it's present basic
formula (less the modern and exotic additives) by a German in 1840 ...
and THEY named it ALUMINIUM .....
AL - YOU - MIN - EE - UM

----- Original Message -----
From: Mike Kimball
To: Rebel List
Sent: Sunday, December 12, 2004 7:29 AM
Subject: Alclad 6061?

I was putting together my 1000th order with Aircraft Spruce and
noticed that
they don't sell alclad 6061. Only 2024 is available alclad. Am I
mistaken.
Isn't alclad 6061 most of what MAM provides? Does anyone know if MAM
provides T4 or T6 6061? OK, why don't I get to the bottom line. I
want to
buy the best stuff for my cowl. Alclad 6061T6 because of 6061's
better
corrosion resistance, and the T6 is the highest level of conditioning
(hardest tempering)? But 2024 is supposed to be better for fatigue
resistance. Watcha think? 2024 or 6061? Just annealed or heat
treated as
well? Since heat treating hardens the metal does that reduce fatigue
resistance? Perhaps the alclad 2024T3 would be best since it is best
for
fatigue resistance, is only moderately hardened, and the alclad
improves
corrosion resistance.

Lastly, I can get sheets rolled and shipped normally (i.e., not
freight) up
to 0.032 thickness. I was planning on using 0.025. I figured on four
3 X 4
foot pieces for each of the four cowl panels. Sound about right?

Mike Kimball (being picky)
044SR

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Posted: **Sat Feb 18, 2012 9:50 am**

After living in Australia for a few years I grew used to calling it
auluminium after a while. But I've been back in the US for 8 years now.
Apparently, I simply adapt to where I'm at after enough time has past. I'm
afraid it's a-loo-mi-num for me again.

A web search showed me that alclad 6061 is out there. But it's not common.
I'll probably just go with 6061-T6 since the whole rest of the airplane is
made of that.

Mike

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com]On Behalf Of
Rick Harper
Sent: Saturday, December 11, 2004 12:07 PM
To: rebel-builders@dcsol.com
Subject: Re: Alclad 6061?

G'day Mike ;

6061 is NOT an "alclad" aluminium - because it doesn't need to be !
..... 2024 IS because it has crappy corrosion properties & the "alclad"
gives it a skin of resistant aluminium to protect the underlying - more
exotic mixture.

YES ... 2024 IS stronger than 6061 .... but MAM designed their a/c
around the strength characteristics of 6061 .... and 6061 is an
"exterior grade" alloy ... they make aluminium truck bodies / chassis
out of 6061 ... but they don't make 'em out of 2024 !

Rick Harper
541R

PS I'm not a nerd speller .... "Aluminium" is what the whole WORLD
(minus America) calls it .... because that IS its name ... discovered by
a French chemist in 1825 - refined to basically it's present basic
formula (less the modern and exotic additives) by a German in 1840 ...
and THEY named it ALUMINIUM .....
AL - YOU - MIN - EE - UM

----- Original Message -----
From: Mike Kimball
To: Rebel List
Sent: Sunday, December 12, 2004 7:29 AM
Subject: Alclad 6061?

I was putting together my 1000th order with Aircraft Spruce and
noticed that
they don't sell alclad 6061. Only 2024 is available alclad. Am I
mistaken.
Isn't alclad 6061 most of what MAM provides? Does anyone know if MAM
provides T4 or T6 6061? OK, why don't I get to the bottom line. I
want to
buy the best stuff for my cowl. Alclad 6061T6 because of 6061's
better
corrosion resistance, and the T6 is the highest level of conditioning
(hardest tempering)? But 2024 is supposed to be better for fatigue
resistance. Watcha think? 2024 or 6061? Just annealed or heat
treated as
well? Since heat treating hardens the metal does that reduce fatigue
resistance? Perhaps the alclad 2024T3 would be best since it is best
for
fatigue resistance, is only moderately hardened, and the alclad
improves
corrosion resistance.

Lastly, I can get sheets rolled and shipped normally (i.e., not
freight) up
to 0.032 thickness. I was planning on using 0.025. I figured on four
3 X 4
foot pieces for each of the four cowl panels. Sound about right?

Mike Kimball (being picky)
044SR

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Posted: **Sat Feb 18, 2012 9:50 am**

Bewdy !
----- Original Message -----
From: Mike Kimball
To: rebel-builders@dcsol.com
Sent: Sunday, December 12, 2004 9:54 AM
Subject: RE: Alclad 6061?

After living in Australia for a few years I grew used to calling it
auluminium after a while. But I've been back in the US for 8 years
now.
Apparently, I simply adapt to where I'm at after enough time has past.
I'm
afraid it's a-loo-mi-num for me again.

A web search showed me that alclad 6061 is out there. But it's not
common.
I'll probably just go with 6061-T6 since the whole rest of the
airplane is
made of that.

Mike

-----Original Message-----
From: mike.davis@dcsol.com [mailto:mike.davis@dcsol.com]On Behalf Of
Rick Harper
Sent: Saturday, December 11, 2004 12:07 PM
To: rebel-builders@dcsol.com
Subject: Re: Alclad 6061?

G'day Mike ;

6061 is NOT an "alclad" aluminium - because it doesn't need to be
!
..... 2024 IS because it has crappy corrosion properties & the
"alclad"
gives it a skin of resistant aluminium to protect the underlying -
more
exotic mixture.

YES ... 2024 IS stronger than 6061 .... but MAM designed their a/c
around the strength characteristics of 6061 .... and 6061 is an
"exterior grade" alloy ... they make aluminium truck bodies / chassis
out of 6061 ... but they don't make 'em out of 2024 !

Rick Harper
541R

PS I'm not a nerd speller .... "Aluminium" is what the whole WORLD
(minus America) calls it .... because that IS its name ... discovered
by
a French chemist in 1825 - refined to basically it's present basic
formula (less the modern and exotic additives) by a German in 1840 ...
and THEY named it ALUMINIUM .....
AL - YOU - MIN - EE - UM

----- Original Message -----
From: Mike Kimball
To: Rebel List
Sent: Sunday, December 12, 2004 7:29 AM
Subject: Alclad 6061?

I was putting together my 1000th order with Aircraft Spruce and
noticed that
they don't sell alclad 6061. Only 2024 is available alclad. Am I
mistaken.
Isn't alclad 6061 most of what MAM provides? Does anyone know if
MAM
provides T4 or T6 6061? OK, why don't I get to the bottom line. I
want to
buy the best stuff for my cowl. Alclad 6061T6 because of 6061's
better
corrosion resistance, and the T6 is the highest level of
conditioning
(hardest tempering)? But 2024 is supposed to be better for fatigue
resistance. Watcha think? 2024 or 6061? Just annealed or heat
treated as
well? Since heat treating hardens the metal does that reduce
fatigue
resistance? Perhaps the alclad 2024T3 would be best since it is
best
for
fatigue resistance, is only moderately hardened, and the alclad
improves
corrosion resistance.

Lastly, I can get sheets rolled and shipped normally (i.e., not
freight) up
to 0.032 thickness. I was planning on using 0.025. I figured on
four
3 X 4
foot pieces for each of the four cowl panels. Sound about right?

Mike Kimball (being picky)
044SR

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