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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
A Question for Warren
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<blockquote data-quote="Warren Jensen" data-source="post: 21094" data-attributes="member: 21"><p>Blaine,</p><p></p><p>A rebated boattail does not have the aerodynamic advantages in flight of a true boattail. These advantages are most evident at about Mach 1.06 and below, but shadowgraphs of supersonic projectiles clearly show that dramatic breakpoints in the airflow at the heal cause amplification of the resulting shockwave and potentially increased drag. You can also see these at cannelures.</p><p></p><p>The argument over which design gives the better seal is moot. All "inherent advantages" are functionally driven by the materials of construction and the degree of precision that the design is executed. Specifically, the "better seal" assumes a certain degree of base upset which varies considerably with the materials of construction.</p><p></p><p>There are a multitude of claims about the nature of the gas flow around the bullet as it is exiting the muzzle. I have to admit that this is an area in which I am learning quite a bit recently. We have been working with Phil Seeburger of OPS Inc. on new suppressors. Phil is the master of muzzle gases. A lot of what you read about this exiting hot air is just that. About the only categorical thing I can say is that the gas has to be directed symmetrically from the muzzle and off the base,heal, boattail of the bullet or the rear of the bullet will be "kicked" to one side. Small imperfections can make a big difference. As to whether there is an inherent advantage of one form or the other in directing these gases and allowing the bullet to yaw less or settle down sooner I am not sure it exists. Precise measurement of these effects is not easy and proof of one or the other's advantage tends to take the form of accuracy results at some distance downrange. These results can be interesting but as we all know could be the result of some entirely different factor. I guess what I am saying is that I am yet to be convinced of any specific advantage at the muzzle, but as I said earlier I am learning fast in this area.</p><p></p><p>Do you have a specific idea that you favor?</p><p></p><p>It is my opinion that rebated boattails exist primarily for manufacturing reasons not for ballistic reasons.</p><p></p><p>[ 09-11-2001: Message edited by: Warren Jensen ]</p><p></p><p>[ 09-11-2001: Message edited by: Warren Jensen ]</p></blockquote><p></p>
[QUOTE="Warren Jensen, post: 21094, member: 21"] Blaine, A rebated boattail does not have the aerodynamic advantages in flight of a true boattail. These advantages are most evident at about Mach 1.06 and below, but shadowgraphs of supersonic projectiles clearly show that dramatic breakpoints in the airflow at the heal cause amplification of the resulting shockwave and potentially increased drag. You can also see these at cannelures. The argument over which design gives the better seal is moot. All "inherent advantages" are functionally driven by the materials of construction and the degree of precision that the design is executed. Specifically, the "better seal" assumes a certain degree of base upset which varies considerably with the materials of construction. There are a multitude of claims about the nature of the gas flow around the bullet as it is exiting the muzzle. I have to admit that this is an area in which I am learning quite a bit recently. We have been working with Phil Seeburger of OPS Inc. on new suppressors. Phil is the master of muzzle gases. A lot of what you read about this exiting hot air is just that. About the only categorical thing I can say is that the gas has to be directed symmetrically from the muzzle and off the base,heal, boattail of the bullet or the rear of the bullet will be "kicked" to one side. Small imperfections can make a big difference. As to whether there is an inherent advantage of one form or the other in directing these gases and allowing the bullet to yaw less or settle down sooner I am not sure it exists. Precise measurement of these effects is not easy and proof of one or the other's advantage tends to take the form of accuracy results at some distance downrange. These results can be interesting but as we all know could be the result of some entirely different factor. I guess what I am saying is that I am yet to be convinced of any specific advantage at the muzzle, but as I said earlier I am learning fast in this area. Do you have a specific idea that you favor? It is my opinion that rebated boattails exist primarily for manufacturing reasons not for ballistic reasons. [ 09-11-2001: Message edited by: Warren Jensen ] [ 09-11-2001: Message edited by: Warren Jensen ] [/QUOTE]
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