I was thinking about fluting my AR as well ... great minds think alike
Fluted HBAR?
- Thread starter tfrazi
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Not sure I understand what you are saying... What do you mean by proportions?
Let me explain it a different way in the hopes of clearing up any confusion:
1-For a barrel of a given diameter and length, non fluted is stiffer than fluted, but non fluted will weigh more.
2-For a barrel of a given weight and length, fluted will usually be stiffer, but the fluted barrel will have a greater diameter.
At least that is what I have heard and read.
- Feb 4, 2013
- 28,175
This is different than what I had heard.
And finally:
Pinecone, your understanding comports with mine with one minor exception. Some companies are doing some exceptionally stupid fluting that gives you the worst of both worlds... The weight of an HBar, and the stiffness of a non HBar.
Consider this barrel:
Thus my use of the word "usually" in my post above.
Consider this barrel:
Thus my use of the word "usually" in my post above.
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I am going with the thought process that the fluted barrel is stiffer given the two are of same diameter. Lighter and stiffer. Think I-Beam.
An I beam is not stiffer than a solid beam of steel having the same external dimensions.
Vile Shadow
...
- Feb 28, 2013
- 28,953
Well, what I meant was this.
A thicker wall barrel will have a larger circumference.
Thus, the greater your barrel circumference, the more flutes you can cut into the barrel. And with a thicker wall barrel, you can cut them deeper.
Although, I don't think I've ever seen a barrel fluted like on that rifle. Don't they usually run ALONG the barrel instead of AROUND it?
Full article http://bisonballistics.com/articles/the-fluted-barrel-stiffness-and-rifle-accuracy
Ok, I looked this up after commenting and we are somewhat both correct...
What Does Fluting A Barrel Do to Stiffness?
Taking a barrel and cutting flutes into it will 100%, take-it-to-the-bank, certainly make it less statically stiff than it was without the flutes. This fact is shown easily with elementary engineering principles and is not up for debate. If anyone tells you otherwise, they are wrong.
Equally true is that a barrel with flutes will be statically stiffer than another, non-fluted barrel of equal weight and length. Again, this is not up for debate. This is because material on the outer diameter contributes more to stiffness than material near the center. A fluted barrel will necessarily have a larger outer diameter than a non-fluted barrel of the same weight.
What about dynamic stiffness? Generally speaking, reducing static stiffness reduces dynamic stiffness (that is, the barrel will vibrate more slowly and with greater deflection). It also turns out that reducing mass increases dynamic stiffness. So what wins when you flute a barrel - the lower static stiffness or the decreased mass?
Unfortunately, this is a very tough question to answer definitively. A lot depends on exactly how and where you do the fluting, and what sort of vibrations you are interested in. For a fascinating analysis, check out Varmint Al's Fluted Barrel Page.
How does it go? Ounces = pounds and pounds = pain.
Kman
Blah, blah, blah
And an I beam only has stiffness and integrity when upright as a post with flanges (I). They are only rigid in that direction. When on it's side (H) there is much less integrity. A barrel is round and would need equal stiffness or integrity of the circumference.
Lou45
R.I.P.
After reading all this HBAR fluted stuff, I'm glad my HBAR junk isn't fluted...........I deleted the rest of the post......
whistlersmother
Peace through strength
After reading all this HBAR fluted stuff, I'm glad my HBAR junk isn't fluted...........I deleted the rest of the post......
But only 3% of it would be fluted?
- Feb 4, 2013
- 28,175
But an I-beam is not stiffer than a solid piece of the same dimensions. It is actually less stiff. But it IS a lot lighter.
pwoolford
AR15's make me :-)
When I want to travel light I grab an SBR. This setup was more for accuracy and the fluting looked neat. Kind of like the Rainier barrel below I built last year.
This thread does have me curious how a standard 20" HBAR will compare to a fluted 20" HBAR in terms of accuracy. The only thing I'm pretty sure of is I am not nearly a good enough shooter to ever see the difference.
This thread does have me curious how a standard 20" HBAR will compare to a fluted 20" HBAR in terms of accuracy. The only thing I'm pretty sure of is I am not nearly a good enough shooter to ever see the difference.
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whitelightning777
Active Member
- May 20, 2013
- 181
Fluting just adds cost more than anything else. From what I've heard, it's purely cosmetic.
Vile Shadow
...
- Feb 28, 2013
- 28,953
I'm inclined to agree. I can't see allowing anyone to get that close to any of my rifles with any "machinery".
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