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Posted: 10/13/2004 3:54:10 PM EST
[Last Edit: 10/13/2004 3:54:49 PM EST by AnArKey]
Flash hider: 5-prong, 1" diameter, 2" long
http://www.derekdevises.com/pictures/flash.jpg

Muzzle brake: 6 chamber, 1" diameter, 2" long
http://www.derekdevises.com/pictures/brake.jpg

Both will be available in 5/8x24 thread for 30 and 50 cal bullets.

9mm will be 1/2x32 thread (standard thread on extended pistol barrels)

Comments? Interest? Pricing would be ~$40 for all pieces.
Link Posted: 10/13/2004 4:14:00 PM EST
I kinda liked the 6-pronged one from the other thread...kind of a A1/Vortex hybrid What are they going to be made of and how are they going to be finished?
Link Posted: 10/13/2004 5:44:30 PM EST
[Last Edit: 10/14/2004 6:15:55 AM EST by QuikSilver]
I like the newest Vortex G6A1 with the ring machined into it. Like an A1/A2 has on the back.

I believe the Vortex's are machined out of 8620 steel. It has to be tough stuff since the tines are open at the end and not closed like a Phantom or A1/A2.

Don't forget to machine flats into the back side for a wrench.

I like them alot! Maybe think about one in 6.8SPC since there is only 1 FH out there for it, the Vortex!

Link Posted: 10/13/2004 6:19:39 PM EST
If you can do the 30 cal model for the $40 price range I would be interested in that!
Link Posted: 10/14/2004 6:13:42 AM EST
[Last Edit: 10/14/2004 7:27:29 AM EST by Wave]
Link Posted: 10/14/2004 6:16:02 AM EST
What is the OD on the FS?
Link Posted: 10/14/2004 7:00:05 AM EST
Gotta think...that thing would look pretty on the end of my FAL...

I'd be in for a .30
Link Posted: 10/14/2004 7:16:59 AM EST
I will take a 30 Cal FH.
Link Posted: 10/14/2004 1:24:16 PM EST
[Last Edit: 10/14/2004 1:26:04 PM EST by AnArKey]
Thanks for the feedback so far guys. Helping me figure out how I want to go.

It seems the 223 barrell attachment market is saturated, it's just not worth it to try and offer the 25th kind of brake/FH.

I'm almost certainly gonna do the FH and brake in 30 with 5/8x24 as the first run. Seems that's where the demand most is. I'd want to do a group buy before commiting to making some for SOCOMs (45x?) and 50s.

On the 50, if you don't get the barrel threaded, you are still stuck with the Alexander Arms brake, which I don't see working half as well as it could really. Being a over the barell brake, it can't count on proper bore alingment. As a result, it's just a 1" tube with holes around the outside. Most of the blast can still go around or behind the bullet and out the 1" opening, giving recoil. You want to trap/deflect as much gas as possible, and to do this you want closesly clearanced baffles, as many as you can.

So I could offer a similar brake to the Alexander Arms, at a much more realistic price, $50 or so, but it wouldn't work half as well as one that uses thread on the barrel.

You being a 50 guy, you tell me what you think about the rest of the 50 owners? Lot of em go for a slip over brake? Recommend a good forum to pose this question?

Link Posted: 10/14/2004 2:19:03 PM EST
[Last Edit: 10/14/2004 2:41:53 PM EST by Wave]
Link Posted: 10/14/2004 3:17:27 PM EST
[Last Edit: 10/14/2004 3:52:47 PM EST by AnArKey]
Well I don't want to miss out on a market with some Beowulf slip on brakes, so I'll probably make some of those for people who refuse to get their barrel threaded. I'll draw up some designs and post them later. The inside diamter of the tube would be just a hair over the OD of the Beowulf barrel, so it will slip on with little to no "slop," and have a couple set screws.

For the people who want a real muzzle brake or FH (that works to maximum effectiveness), I'll have threaded attachments.

Having a thread discussion for the big bores here:

www.ar15.com/forums/topic.html?b=3&f=121&t=206137&page=1?
Link Posted: 10/14/2004 8:31:15 PM EST
With respect to the efficacy of the Beowulf brake, there are a few things to consider. While baffles would seem the logical choice, these require substantial muzzle pressure to be truly effective. The 458 SOCOM and 50 Beowulf, due to their inherent low pressure, have very low (relative) muzzle pressure. This makes most baffled designs less than effective. Case in point, the JP Recoil Eliminator is considered one of the best (and ugliest). Installed on a 223 SBR or 7mm Mag it works wonders. On a 16" 458 SOCOM it was nothing but added weight and window dressing. On the other hand, the Shrewd brand brake, similar in appearance to the AA for the 50B, appears FAR more effective.

Bill Alexander is very knowledgable when it comes to this type of work, and I would be hesitant to question his design. He and I have spoken at length about his brake and it was designed specifically to overcome the challenges of low pressure and large bore opening. It was the best design that worked. Added benefit of these small hole type brakes is that they do act in some respect as flash hiders without being classified as such (ever seen a process industry flame arrestor?)

Now, his price seems a little out of line with the norm, but that is for him to decide.

Marty
Link Posted: 10/16/2004 6:10:37 AM EST
Very nice modeling work and some interesting concepts. I assume that you have analysed how the gas flow in your units will effect the back pressure in the Beowulf and the result on the long term fatigue life of the bolt assembly. (Need to run 12K durability).

Also in your design work please remember that a large proportion of the effect you are trying to achieve is associated with the precursor supersonic shock not just the combustion gas flow. baffles are not a bad answer but they are not essential in this type of flow work.

Beware comps on rifle barrels where the precursor is dominant as the barrel can move off line before the bullet exits (lots of testing first please).

Bill Alexander
Link Posted: 10/16/2004 3:04:14 PM EST
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