Explaination of common heli grades of aluminum  
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All Forums >> RC Helicopters >> Electric RC Helis >> Esky Helicopters >> Explaination of common heli grades of aluminum
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Explaination of common heli grades of aluminum - 7/3/2008 8:52:21 PM   
Zimatosa


 

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Although I did not write this, I thought it to be informative on the matter of aluminum grades and qualities. This may or may not help you in the decisions of which grade of aluminum you purchase for your personal heli....Good Luck!

Common Alloy: Sheet — Plate — Coil
1100 • 3003 • 5052 • 5083 • 5086 • 5454 • 5456 •
Tempers: "O" • "F" • H12 • H14 • H32 • H34 • H116 • H131 • H321 •

Heat Treatable Alloys: Sheet — Plate — Rod — Bar
2014 • 2219 • 2124 • 6013 • 6061
7050 • 7075 • 7150 • 7178 • 7475 •
Tempers: T3 • T351 • T4 • T451 • T6 • T651 • T7351 •
T7451 • T7651 • T7751 • T8151 • T851 • T87 •

Specific Alloy and Temper: Aircraft Quality Aluminum
2219-T87 • 2219-T851 • 2124-T851 • 2124-T8151
7050-T7351 • 7050-T7451 • 7075-T7651 •7075-T651
7178-T6 • 7150-T7751 • 7475-T7351

Aluminum: Rod — Bar — Wire — Tube
1100 • 2011 • 2017 • 2024 • 6020 • 6061 • 6063 • 7075 •

6000 Series Aluminum Alloys: Magnesium and silicon are the major alloy additions, making these alloys heat treatable. 6061 is the principle alloy. It is one of the least expensive and most versatile aircraft aluminum alloys available. A good range of mechanical fatigue properties and excellent corrosion resistance for a heat treatable aircraft alloy. Can be fabricated by virtually all methods. Excellent spot and fusion weldability for a heat treatable grade. Can also be furnace brazed. Available as a clad alloy for even better corrosion resistance. Although not as strong as the 2000 or 7000 series of heat treatable alloys, its corrosion resistance is far greater. Far ranging applications including aircraft, missiles and space, ground and marine transportation, screw machine parts and some industrial commercial uses. 6063 is widely seen in extrusion products for architectural applications. Has excellent finishing characteristics it is the best alloy for anodizing applications, either plain or dyed.

7000 Series Aluminum Alloys: Probably the highest strength series of aluminum alloys for aircraft applications. Relies on zinc as the primary alloy addition. Excellent fatigue properties, but in the T6 temper the fracture toughness can be inferior to other alloy choices. Many aircraft applications in the late 1940's and 1950's used 7075 T6 before some bad habits were understood. Normally formed fabricated in the annealed (0) condition. Can be spot welded but not fusion welded. Poor corrosion resistance if not protected by chem film, anodize, prime or paint. In sheet forms almost always used as a clad alloy. Other popular alloys now include 7049, 7050 in the overaged temper condition (T7xxx).



Peace,

Z

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RE: Explaination of common heli grades of aluminum - 7/3/2008 10:46:15 PM   
dondecap


 

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ok sir,
very good post,
but what does this mean to us mere heli pilots? not many engineers amongst us,
what grade number would be recomended for say -
new frame?
or
skid legs?
regards
don

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RE: Explaination of common heli grades of aluminum - 7/3/2008 10:59:18 PM   
Empty Wallet


 

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OK....
Good info.
But who uses what in their parts and how do you know for sure your getting what they say you are?

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RE: Explaination of common heli grades of aluminum - 7/4/2008 6:10:38 AM   
DumbDawg



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Well You have to take their word for it you are getting what they say... unless ur a metallurgist and have the facility to test said materials. But the info is helpful when a nock-off either doesn't mention the materials used or mentions it and then touts its the greatest when in fact its the lowest grade of the aircraft materials.

Its best to be informed rather than skunked... IMO

Happy machining

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RE: Explaination of common heli grades of aluminum - 7/4/2008 6:47:16 AM   
Zimatosa


 

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quote:

ORIGINAL: dondecap

ok sir,
very good post,
but what does this mean to us mere heli pilots? not many engineers amongst us,
what grade number would be recomended for say -
new frame?
or
skid legs?
regards
don


You would have to know the grades of all the parts you were comparing first. Then decide if you want to use it based partially on the help/info listed in grading charts, partially on the info/help that people you trust tell you, and maybe partially on what you think.(hehe) Skids and frames would probably be exempt for the most part. Skids are just too cheap for most to worry about what grade they fall in. You have a bigger problem than grade of aluminum on frames if the frame is solid aluminum(see Pigeon 450M1), WEIGHT! Can not say how, what, why on layered aluminum frames. Would not think that they qualify for the grading either? Anyone?

Parts like aluminum Heads and tail boxes, or any part that you are paying top dollar for compared to its plastic counter-part, need to be judged in a different light. Sure, it might look sturdy(Esky purple crud) and look pretty(not Esky purple stuff ) but the grading chart will give you a little more help while sitting in front of your monitor buying parts in your underwear. I am a fairly disciplined shopper as well. I can go to my hobby store and see all the candy but only gather information until I need the part, then buy it for the cheapest i can find online. The case of my CNC head from XMSeller was just knowing that i wanted the quality that I know HDX puts out....

Lastly, the chart really only needs to be loosely understood ONE time. Thereafter, when you see a number for the grade of aluminum, you will have your own ideas about if it is worth the X amount of dollars. Anyone want to buy a 6061 head for $100.00? LOL!

I will shuttup now..Hehehe

Peace,

Z

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RE: Explaination of common heli grades of aluminum - 7/4/2008 7:06:24 AM   
heliaction



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Firstly i would like to know where you get the alloy specs of the helis you have refer to (Copter X and HDX). Secondly i have seen you favour one over the other because of aluminium type, yet there is not mention of temper. Now that in its self is probably more important that the types of aluminium you are comparing. Thirdly good work on the alloy chart but while i will not debate you, i will question the aircraft quality aluminium section. 2024 T3 is probably the most common type of aircraft alloy yet it was not mentioned.

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RE: Explaination of common heli grades of aluminum - 7/4/2008 8:00:22 AM   
Zimatosa


 

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For starters, The thread I was comparing the HDX and CopterX aluminum is not even this thread....However, the Specs for the HDX are on cnchelicopter.com among many other sites. A hobby shop owner or two I know also agree on my personal findings of HDX being the supremest sh*t you can buy for the money. The quality does not stop at aluminum grade either, man. Craftsmanship, tolerances, bearings, anodizing, performance, the whole she-bang.... Even holding a CopterX head in my hand made my mind think it was a cheaply made(old and battered looking even though it was brand new). This kind of manufacturing, giving people a cheap choice to entice a sale just does not work for me. For you are lucky you are not me and I am not you, cause I would be using your bank account to buy an HDX head. I am tired of "saving money" only to be totally unhappy and pissed at the performance and/or look of a new "bling" head. Did you also buy your wife a Cubic Zarconia instead of a diamond? They look the same.....Searching and reading through threads that contained "CopterX and/or CopterX head" gave me a fairly definitive answer to the grade of aluminum that is used in CopterX Heli's. Price is also another giveaway on the fact that it is not the highest quality aluminum.....Ahem

I stated atthe very beginning of my post: "Although I did not write this, I thought it to be informative on the matter of aluminum grades and qualities. This may or may not help you in the decisions of which grade of aluminum you purchase for your personal heli....Good Luck!"

If you would like to add or subtract or murder or maim any part of this information, I welcome it. That is what this forum is for, information, what do OTHER people think. I can then form my own opinions, no matter how good or bad others think they are. I just wanted others to have the information that they may or may not know existed.

My opinions of the HDX and CopterX are my findings and others opinions as well. I am a pretty avid believer in the, "you get what you pay for" saying. Also the, "If it's to good to be true, it probably is" thing-a-ma-bob....

Sheeee-it

Peace,

Z

P.S. I like Kiwi too, but New Zealand lies about the fact that they produce more Kiwi than any other place on Earth to sell more fruit. Gridley California is the Kiwi capitol of the world. I seen the sign myself....

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RE: Explaination of common heli grades of aluminum - 7/4/2008 8:48:40 AM   
Empty Wallet


 

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Who put that CopterX head in your hand?
One of the hobby shop owners?

I have seen and held several genuine Trexes.
I cant see or feel any difference in quality between those and the head that came with my CopterX.

If the "new" CopterX head you were holding was "old and battered looking", someone was playing games.

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RE: Explaination of common heli grades of aluminum - 7/4/2008 9:37:12 AM   
heliaction



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I couldn't agree more in the saying you get what you pay for. That is why i don't fly a clone. I have never seen an HDX or a Copter X so i am not compairing the 2, just material you mentioned. I wouldnt buy either and am more that satisfied with what i have.

quote:

I like Kiwi too, but New Zealand lies about the fact that they produce more Kiwi than any other place on Earth to sell more fruit. Gridley California is the Kiwi capitol of the world. I seen the sign myself....


I take that as humour, we all know that a KIWI is actually a flightless bird native to our country, named before the British settled by our native people. I cant help the fact that loads of others sold our marketing name.

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RE: Explaination of common heli grades of aluminum - 7/4/2008 10:00:49 AM   
heliaction



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Zimatosa, your comment got me thinking so i did a little research. i was quite surprised at the results

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RE: Explaination of common heli grades of aluminum - 7/4/2008 1:25:15 PM   
dicharry


 

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Great info Zimatoza on US metalurgy. Now if we could just get the Chinese to give us their standards........

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RE: Explaination of common heli grades of aluminum - 7/4/2008 6:14:32 PM   
blk822



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You can do a simple test to see how hard the metal is in a head or what have you. Get yourself a automatic center punch and just center punch the metal then the other peice being tested and compare the depth and diameter of the dent. the softer aluminum will have a deeper and larger dent.

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RE: Explaination of common heli grades of aluminum - 7/4/2008 6:28:08 PM   
DumbDawg



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I'll bet the HS owner would be pleased if you walk in with a punch and asked to see some of the cnc heads hes got. Then proceed to punch the bits full of little indentations... He just might have something to say about that... not sure but maybe. Can I get a copy of the vid when you try this?? lol

Happy punch'n

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RE: Explaination of common heli grades of aluminum - 7/4/2008 7:27:58 PM   
Zimatosa


 

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