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Old 04-26-2010, 09:41 PM   #1
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Skin question

Hello,

I replaced a couple of outside skin pieces with new .040 aluminum 50-52. Now the replaced area doesn't look like the old skin. I heard that the original skin was .035 aircraft grade aluminum. I don't think you can buy that anymore. does anyone gone through the same thing? would polishing do thr trick? any suggestions

Thanks
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Old 04-26-2010, 10:18 PM   #2
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I believe the outer skin is 2024 T3 0.032"
It is still being made.
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Old 04-26-2010, 10:30 PM   #3
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I believe the outer skin is 2024 T3 0.032"
It is still being made.
Absolutely correct.

Andy
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Old 04-26-2010, 10:40 PM   #4
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Thanks Richard,

It is too late, I have already replaced several pieces. The bozo (butch Walter) mis-informed me. Oh well, what should I do to make the replaced area look like the rest?

Steve
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Old 04-26-2010, 10:41 PM   #5
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Originally Posted by steverad View Post
Thanks Richard,

It is too late, I have already replaced several pieces. The bozo (butch Walter) mis-informed me. Oh well, what should I do to make the replaced area look like the rest?

Steve
Steve.

To make the new match the old metal, you will need to start all over again.

Andy
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Old 04-27-2010, 03:13 AM   #6
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It should be stated, as many already know... that the thickness is not the issue it the type of aluminum.... "Alclad" The alloy that has the protective coating on the outside surface is the correct aluminum for your year of trailer... 2024-T3 .032 is the spec .... However, I like others are using .040 (same thickness of todays' Airstreams) on belly panes and other parts of the trailer just fine! It should also be noted that Airstream switched to 6061-T6 .032 in the early 70's due to cost! SO the real question becomes how shinny do you really want your trailer because both will polish the "Alclad will just be "more shinny" ...

Now to your uses of the 50-52 would in my mind be more about strength than looks... It is my understanding (and not fully sure so I hope others will chime in) that the 50-52 due to the fact it is not tempered should not be used because it is too soft and not what most would call structural strength aluminum! So should you replace the panels that you have replaced... I would have to state yes, due more on the side of strength than looks!!!

Todd...

P.S. I can provide a source for the best price of 2024-T3 .032 and .040 if you so desire that information...
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Old 04-27-2010, 05:41 AM   #7
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Alclad, that was used in the early Airstream trailers, is actually a laminate. The alloy in the middle is 2024. That is an alloy with copper in it and has poor corrosion resistance, but can be heat treated to obtain a high strength. To make is suitable for airplanes, they coated it with pure aluminum, which has poor strength but excellent corrosion resistance. Therefore; the name : AL CLAD, aluminum coated. This material is still available from Aircraft repair supply houses.
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Old 04-27-2010, 05:58 AM   #8
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Aircraft Spruce has as much 2024 as your checkbook can stand. Here is the link to the web page for what you needed. 2024T3 ALCLAD ALUMINUM from Aircraft Spruce
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Old 04-27-2010, 10:15 AM   #9
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Thank you all for the great information. My conclusion form reading these posts is that either I live with the look of it or replace all of the new pieces. (6 pieces) OUCH

Have a great day
Steve
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Old 04-27-2010, 12:29 PM   #10
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1960’s switched to Alcoa for the Aluminum material. Alcoa-Aluminum Alclad sheet 2024-T3 .032



1998 -200….Alcoa Bright Versatrim leveled sheet 3004-H18 side and window sheet .040
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Old 04-27-2010, 07:56 PM   #11
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5052 falls into the Non-Heat–Treatable (NHT) family of alloys along with 1XXX, 3XXX, and 4XXX. While 5052 can't be strengthened by heat treatment it can be strengthened by cold working which gives it an F temper designation. 5052 can be purchased in several other tempers as well. The main alloy in 5052 is magnesium which helps give it strength, it also has good corrosion resistance and is stronger than 1XXX and 3XXX alloys. The only way to really strengthen though is to bend, brake, or otherwise form it.

2024 is in the Heat-Treatable (HT) family along with 6XXX, and 7XXX series alloys.
2024 comes in an assortment of tempers as well (T4, T6, etc.). T3 is an alclad sheet and commonly referred to as aircraft alloy because of its yield strength and fatigue resistance and has a yield strength in the 50ksi range, where as 5052 yields in 24 ksi range.

While 5052 isn't the strongest material, its not the end of the world in my book.

Best of luck,

Kevin




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Old 11-21-2010, 08:55 AM   #12
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It should be stated, as many already know... that the thickness is not the issue it the type of aluminum.... "Alclad" The alloy that has the protective coating on the outside surface is the correct aluminum for your year of trailer... 2024-T3 .032 is the spec .... However, I like others are using .040 (same thickness of todays' Airstreams) on belly panes and other parts of the trailer just fine! It should also be noted that Airstream switched to 6061-T6 .032 in the early 70's due to cost! SO the real question becomes how shinny do you really want your trailer because both will polish the "Alclad will just be "more shinny" ...

Now to your uses of the 50-52 would in my mind be more about strength than looks... It is my understanding (and not fully sure so I hope others will chime in) that the 50-52 due to the fact it is not tempered should not be used because it is too soft and not what most would call structural strength aluminum! So should you replace the panels that you have replaced... I would have to state yes, due more on the side of strength than looks!!!

Todd...

P.S. I can provide a source for the best price of 2024-T3 .032 and .040 if you so desire that information...
Can you provide a source for 0.040" sheets?
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Old 11-21-2010, 10:07 AM   #13
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Can you provide a source for 0.040" sheets?
What size sheets?

Andy
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Old 11-21-2010, 01:09 PM   #14
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Aluminum Sheets,2024T3,6061T6,3003H14,5052H32

These guys were excellent to deal with :-)
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