User Panel
User Panel
User Panel
|
Posted: 9/23/2005 10:44:51 AM EDT
[#1]
|
|
|
|
Posted: 9/23/2005 10:53:28 AM EDT
[#2]
Turn it down til it looks like a MacDonalds beverage straw!
|
|
|
|
Posted: 9/23/2005 12:53:39 PM EDT
[#3]
 |
|
|
|
|
Posted: 9/25/2005 10:43:23 AM EDT
[#4]
I think it's worth it. When I get my paperwork, I'm going to have my 11.5 heavy turned down to an M4 contour under the handguards.
|
|
|
|
Posted: 9/25/2005 10:46:45 AM EDT
[#5]
why the heck would you want cooling fins? Adding surface area under the handguards isn't going to do jack for cooling.
|
|
|
|
Posted: 9/25/2005 11:44:52 AM EDT
[#6]
More surface area = improved cooling abilities, even under handguards.
|
|
|
|
Posted: 9/25/2005 11:47:19 AM EDT
[#7]
It'll give the effect of a heatsink, and yes, even under the handguards, though not to the same effect that it'd give outside where there was good airflow.
|
|
|
|
Posted: 9/25/2005 11:48:18 AM EDT
[#8]
I'm going to have to pull out a thermo book...there is going to be no air movement so any fins isn't going to be beneficial if I can remember back to undergrad engineering |
|
|
|
|
Posted: 9/25/2005 12:13:31 PM EDT
[#9]
This guy sounds smart enough to have already figgered out that he will have a solar powered cooling fan! |
||
|
|
|
Posted: 9/25/2005 7:52:09 PM EDT
[#10]
You guys have really hit a nerve with many good responses. I don't know how you figured out the blower so fast.
I would like to ask the head of the class another question? In a 24” barrel with a 1 twist per eight inches makes three revolutions down the barrel. And a 21” barrel with a 1 twist per seven inches makes three revolutions. The rate of twist is a factor of three to one. Considering a single 55-grain or 62-grain FMJ bullet. Is the rate of twist optimum for both loads and what factor does propellant and speed play? What twist rate does a 55-grain bullet require for optimum performance? What twist rate does a 62-grain bullet require for optimum performance? Are two revolutions adequate? |
|
|
|
Posted: 9/25/2005 8:02:53 PM EDT
[#11]
The handguards are not a sealed item; if you get rain through the vents, you'll get air. Granted, it won't be great, but there will still be flow.
|
|
|
|
Posted: 9/25/2005 8:34:14 PM EDT
[#12]
|
|
|
|
Posted: 9/28/2005 10:54:58 PM EDT
[#13]
The number of twists that the bullet actualy does in the barrel does not matter. The actual twist RATE gets the bullet spinning the proper rate in only a few inches of barrel travel. 55gr needs a 1:12" twist rate to stabilize at carbine and rifle lengths. 62gr needs about a 1:11" twist, but 1:9 is the next most commonly found twist rate that's faster than 1:12 Cutting the barrel down significatly will influence the velocity enough that you MIGHT (but probably not) need to be a little bit faster than 1:12. A short 1:9 barrel would easily handle the 62gr bullets. The propellant does not matter to bullet stability as long as it makes the proper velocity and the right amount of gas to run the action. Randall |
|
|
|
Win a FREE Membership!
Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!
You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.
AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types.
From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm.
Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more.
Copyright © 1996-2024 AR15.COM LLC. All Rights Reserved.
Any use of this content without express written consent is prohibited.
AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own.
