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| Ragnarok |
 Posted: 04/17/2008 8:38 AM Post subject: |
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Lord of Karma
Joined: 19 Dec 2006
Posts: 2545
6847.20 Spud Bux
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| TwitchTheAussie wrote: | | Its easy with the right metals and an oxy torch |
Would you really want to invest that much effort into a round that will be completely obliterated on impact?
I'd be prepared to make saboted finned round that I know I won't get back, but the effort required to make spring loaded fins is more than I would want to invest for a one use projectile.
Using fins (for enhancing accuracy) on a full bore projectile (higher drag) that could only be fired relatively slowly (thus with limited practical aimed range anyway).
The advantage of saboted rounds is that the fins are fixed, velocity is higher, drag is lower.
It's an easier to make round that will go further... no competition for me. |
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| Antonio |
| Posted: 04/17/2008 8:46 AM Post subject: |
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Captain of Industry
Joined: 13 Aug 2006
Posts: 495
24.52 Spud Bux
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| jackssmirkingrevenge wrote: | | I think in the case of us humble amateurs, it's not really worth the trouble. Fold-out fins are undeniably cool, but you never get to see them work and you can achieve the same stability by simply hollowing out the tail of your projectile. |
Yeah I think its easier to make the projectile stable by moving the center of mass forwards instead of moving the center of pressure(due to the air flowing past it) using the fins backwards. |
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| daccel |
| Posted: 04/17/2008 20:08 PM Post subject: |
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Specialist
Joined: 11 Oct 2007
Posts: 45
193.06 Spud Bux
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| Some good points, a sabot does seem to win out on this one. If it aint broke... One note though, the fins do add rotation which increases accuracy over a non-rotating mass forward design. However, that slight increase in accuracy would probably be negated by imprecise construction, and only noticeable at long range. |
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| TwitchTheAussie |
| Posted: 04/17/2008 22:59 PM Post subject: |
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Brigadier General
Joined: 06 Feb 2007
Posts: 931
1003.70 Spud Bux
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| Ragnarok wrote: | | TwitchTheAussie wrote: | | Its easy with the right metals and an oxy torch |
Would you really want to invest that much effort into a round that will be completely obliterated on impact?
I'd be prepared to make saboted finned round that I know I won't get back, but the effort required to make spring loaded fins is more than I would want to invest for a one use projectile.
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Itd still be a good job to do |
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| Lentamentalisk |
| Posted: 04/18/2008 1:48 AM Post subject: |
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Resident Tinkerer
Joined: 07 Aug 2007
Posts: 801
818.16 Spud Bux
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| daccel wrote: | | Some good points, a sabot does seem to win out on this one. If it aint broke... One note though, the fins do add rotation which increases accuracy over a non-rotating mass forward design. However, that slight increase in accuracy would probably be negated by imprecise construction, and only noticeable at long range. |
This is not the case. The only way that the fins would add even a slight rotation (at the cost of forward velocity) would be if the fins were slanted, which is much easier to do on static fins, such as seen in saboted ammo, or if your spring fins were put on crooked, in which case it won't fly straight no matter what. |
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| jackssmirkingrevenge |
| Posted: 04/18/2008 3:42 AM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6981
11122.02 Spud Bux
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| Lentamentalisk wrote: | | This is not the case. The only way that the fins would add even a slight rotation (at the cost of forward velocity) would be if the fins were slanted |
Not necessarily, if you give the fins an aerofoil shape the projectile will spin too. |
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| tmacd995 |
| Posted: 04/18/2008 9:50 AM Post subject: |
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Private First Class
Joined: 27 Feb 2008
Posts: 34
94.62 Spud Bux
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| I think what Blitz posted would be amazing, somebody make it and I will be happy to use it. |
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