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Steerable bullet
Eyes getting old? Having trouble hitting the ten ring? Are those
running pronghorns just too jumpy for you these days? DARPA's .50 cal EXACTO bullets may be just what you need. Don't shoot it and then forget it; just shoot it, and then steer it: http://tinyurl.com/lkyjp9f -- Ed Huntress |
Steerable bullet
"Ed Huntress" wrote in message
... Eyes getting old? Having trouble hitting the ten ring? Are those running pronghorns just too jumpy for you these days? DARPA's .50 cal EXACTO bullets may be just what you need. Don't shoot it and then forget it; just shoot it, and then steer it: http://tinyurl.com/lkyjp9f -- Ed Huntress Larger shells can use similar tech to glide as far as 100 miles. Reactivate the battleships! http://en.wikipedia.org/wiki/Long_Ra...ack_Projectile -jsw |
Steerable bullet
On Tue, 12 May 2015 15:49:17 -0400, Spehro Pefhany
wrote: On Tue, 12 May 2015 12:50:36 -0400, Ed Huntress wrote: Eyes getting old? Having trouble hitting the ten ring? Are those running pronghorns just too jumpy for you these days? DARPA's .50 cal EXACTO bullets may be just what you need. Don't shoot it and then forget it; just shoot it, and then steer it: http://tinyurl.com/lkyjp9f Nice. Probably cost a bit more than .22LR though.. For a while, but when Nintendo starts making them, prices will come down. -- Ed Huntress |
Steerable bullet
On Tue, 12 May 2015 12:50:36 -0400, Ed Huntress
wrote: Eyes getting old? Having trouble hitting the ten ring? Are those running pronghorns just too jumpy for you these days? DARPA's .50 cal EXACTO bullets may be just what you need. Don't shoot it and then forget it; just shoot it, and then steer it: http://tinyurl.com/lkyjp9f Nice. Probably cost a bit more than .22LR though.. -- Best regards, Spehro Pefhany Amazon link for AoE 3rd Edition: http://tinyurl.com/ntrpwu8 Microchip link for 2015 Masters in Phoenix: http://tinyurl.com/l7g2k48 |
Steerable bullet
On 5/12/2015 12:50 PM, Ed Huntress wrote:
Eyes getting old? Having trouble hitting the ten ring? Are those running pronghorns just too jumpy for you these days? DARPA's .50 cal EXACTO bullets may be just what you need. Don't shoot it and then forget it; just shoot it, and then steer it: http://tinyurl.com/lkyjp9f ALL my bullets are steerable...until they leave the tube! |
Steerable bullet
On Tue, 12 May 2015 16:51:30 -0400, Tom Gardner
wrote: On 5/12/2015 12:50 PM, Ed Huntress wrote: Eyes getting old? Having trouble hitting the ten ring? Are those running pronghorns just too jumpy for you these days? DARPA's .50 cal EXACTO bullets may be just what you need. Don't shoot it and then forget it; just shoot it, and then steer it: http://tinyurl.com/lkyjp9f ALL my bullets are steerable...until they leave the tube! Steerable...but are they steered? g This is a very weird thing. How thay got that optical communications and mechanical steering technology into a .50 cal bullet, I can hardly imagine. -- Ed Huntress |
Steerable bullet
On Tuesday, May 12, 2015 at 2:02:10 PM UTC-7, slow eddy wrote:
On Tue, 12 May 2015 16:51:30 -0400, Tom Gardner wrote: On 5/12/2015 12:50 PM, Ed Huntress wrote: Eyes getting old? Having trouble hitting the ten ring? Are those running pronghorns just too jumpy for you these days? DARPA's .50 cal EXACTO bullets may be just what you need. Don't shoot it and then forget it; just shoot it, and then steer it: http://tinyurl.com/lkyjp9f ALL my bullets are steerable...until they leave the tube! Steerable...but are they steered? g This is a very weird thing. How thay got that optical communications and mechanical steering technology into a .50 cal bullet, I can hardly imagine. -- Ed Huntress slow eddy couldn't imagine a pushrod motor destroying the Ford EcoBoost motor but that's exactly what has happening this year in Daytona Prototype racing where pushrod motors have won 3 of 4 races held so far. Detroit Belle Isle is up next. |
Steerable bullet
On Tuesday, May 12, 2015 at 2:02:10 PM UTC-7, Ed Huntress wrote:
On Tue, 12 May 2015 16:51:30 -0400, Tom Gardner wrote: On 5/12/2015 12:50 PM, Ed Huntress wrote: Eyes getting old? Having trouble hitting the ten ring? Are those running pronghorns just too jumpy for you these days? DARPA's .50 cal EXACTO bullets may be just what you need. Don't shoot it and then forget it; just shoot it, and then steer it: http://tinyurl.com/lkyjp9f ALL my bullets are steerable...until they leave the tube! Steerable...but are they steered? g This is a very weird thing. How thay got that optical communications and mechanical steering technology into a .50 cal bullet, I can hardly imagine. -- Ed Huntress I was the Guidance and Control Manager for my companies' proposal for the original EXACTO BAA. We lost but it was a lot of fun. It was huge technology risk to make it all work. I still have the Stero-Lithogrphy bullet concept and a actuator control demonstrator on my desk. There was a press release a year or so ago from Teledyne where they disclosed the steering concept. It used and magnetostictve material (Terfinol) to actuate the rear fins. |
Steerable bullet
On Tue, 12 May 2015 14:23:38 -0700 (PDT), Dan
wrote: On Tuesday, May 12, 2015 at 2:02:10 PM UTC-7, Ed Huntress wrote: On Tue, 12 May 2015 16:51:30 -0400, Tom Gardner wrote: On 5/12/2015 12:50 PM, Ed Huntress wrote: Eyes getting old? Having trouble hitting the ten ring? Are those running pronghorns just too jumpy for you these days? DARPA's .50 cal EXACTO bullets may be just what you need. Don't shoot it and then forget it; just shoot it, and then steer it: http://tinyurl.com/lkyjp9f ALL my bullets are steerable...until they leave the tube! Steerable...but are they steered? g This is a very weird thing. How thay got that optical communications and mechanical steering technology into a .50 cal bullet, I can hardly imagine. -- Ed Huntress I was the Guidance and Control Manager for my companies' proposal for the original EXACTO BAA. We lost but it was a lot of fun. It was huge technology risk to make it all work. I still have the Stero-Lithogrphy bullet concept and a actuator control demonstrator on my desk. There was a press release a year or so ago from Teledyne where they disclosed the steering concept. It used and magnetostictve material (Terfinol) to actuate the rear fins. Aha! I figured it was either piezoelectric or Terfenol-D. But I worked on a project at Wasino (now Amada Machine Tools) for turning elliptical pistons using a Terfenol actuator, and we had to apply a lot of electronics and programming to overcome the hysteresis. In fact, that's what eventually killed the project. -- Ed Huntress |
Steerable bullet
On Tuesday, May 12, 2015 at 2:38:02 PM UTC-7, Ed Huntress wrote:
On Tue, 12 May 2015 14:23:38 -0700 (PDT), Dan wrote: On Tuesday, May 12, 2015 at 2:02:10 PM UTC-7, Ed Huntress wrote: On Tue, 12 May 2015 16:51:30 -0400, Tom Gardner wrote: On 5/12/2015 12:50 PM, Ed Huntress wrote: Eyes getting old? Having trouble hitting the ten ring? Are those running pronghorns just too jumpy for you these days? DARPA's .50 cal EXACTO bullets may be just what you need. Don't shoot it and then forget it; just shoot it, and then steer it: http://tinyurl.com/lkyjp9f ALL my bullets are steerable...until they leave the tube! Steerable...but are they steered? g This is a very weird thing. How thay got that optical communications and mechanical steering technology into a .50 cal bullet, I can hardly imagine. -- Ed Huntress I was the Guidance and Control Manager for my companies' proposal for the original EXACTO BAA. We lost but it was a lot of fun. It was huge technology risk to make it all work. I still have the Stero-Lithogrphy bullet concept and a actuator control demonstrator on my desk. There was a press release a year or so ago from Teledyne where they disclosed the steering concept. It used and magnetostictve material (Terfinol) to actuate the rear fins. Aha! I figured it was either piezoelectric or Terfenol-D. But I worked on a project at Wasino (now Amada Machine Tools) for turning elliptical pistons using a Terfenol actuator, and we had to apply a lot of electronics and programming to overcome the hysteresis. In fact, that's what eventually killed the project. -- Ed Huntress I suspect Telidyne used an on off control and aero surface PWM to get some sort of proportional control. |
Steerable bullet
On Tue, 12 May 2015 15:15:54 -0700 (PDT), Dan
wrote: On Tuesday, May 12, 2015 at 2:38:02 PM UTC-7, Ed Huntress wrote: On Tue, 12 May 2015 14:23:38 -0700 (PDT), Dan wrote: On Tuesday, May 12, 2015 at 2:02:10 PM UTC-7, Ed Huntress wrote: On Tue, 12 May 2015 16:51:30 -0400, Tom Gardner wrote: On 5/12/2015 12:50 PM, Ed Huntress wrote: Eyes getting old? Having trouble hitting the ten ring? Are those running pronghorns just too jumpy for you these days? DARPA's .50 cal EXACTO bullets may be just what you need. Don't shoot it and then forget it; just shoot it, and then steer it: http://tinyurl.com/lkyjp9f ALL my bullets are steerable...until they leave the tube! Steerable...but are they steered? g This is a very weird thing. How thay got that optical communications and mechanical steering technology into a .50 cal bullet, I can hardly imagine. -- Ed Huntress I was the Guidance and Control Manager for my companies' proposal for the original EXACTO BAA. We lost but it was a lot of fun. It was huge technology risk to make it all work. I still have the Stero-Lithogrphy bullet concept and a actuator control demonstrator on my desk. There was a press release a year or so ago from Teledyne where they disclosed the steering concept. It used and magnetostictve material (Terfinol) to actuate the rear fins. Aha! I figured it was either piezoelectric or Terfenol-D. But I worked on a project at Wasino (now Amada Machine Tools) for turning elliptical pistons using a Terfenol actuator, and we had to apply a lot of electronics and programming to overcome the hysteresis. In fact, that's what eventually killed the project. -- Ed Huntress I suspect Telidyne used an on off control and aero surface PWM to get some sort of proportional control. That sounds reasonable, and would self-correct the hysteresis problem. IIRC, the material has a response rate of around 10 kHz, or maybe it's 20 kHz. The hysteresis is non-linear; it will respond to a reverse signal quickly, but to a diminished degree. And the non linearity itself varies, non-linearly, with the *size* of the signal. It made for a real programming mess. After the consulting engineers tried for six months to do it with equations, we built a look-up table and it worked pretty well. But then the control was too slow. It was a sticky problem. -- Ed Huntress |
Steerable bullet
On Tuesday, May 12, 2015 at 5:21:39 PM UTC-7, Ed Huntress wrote:
On Tue, 12 May 2015 15:15:54 -0700 (PDT), Dan wrote: On Tuesday, May 12, 2015 at 2:38:02 PM UTC-7, Ed Huntress wrote: On Tue, 12 May 2015 14:23:38 -0700 (PDT), Dan wrote: On Tuesday, May 12, 2015 at 2:02:10 PM UTC-7, Ed Huntress wrote: On Tue, 12 May 2015 16:51:30 -0400, Tom Gardner wrote: On 5/12/2015 12:50 PM, Ed Huntress wrote: Eyes getting old? Having trouble hitting the ten ring? Are those running pronghorns just too jumpy for you these days? DARPA's .50 cal EXACTO bullets may be just what you need. Don't shoot it and then forget it; just shoot it, and then steer it: http://tinyurl.com/lkyjp9f ALL my bullets are steerable...until they leave the tube! Steerable...but are they steered? g This is a very weird thing. How thay got that optical communications and mechanical steering technology into a .50 cal bullet, I can hardly imagine. -- Ed Huntress I was the Guidance and Control Manager for my companies' proposal for the original EXACTO BAA. We lost but it was a lot of fun. It was huge technology risk to make it all work. I still have the Stero-Lithogrphy bullet concept and a actuator control demonstrator on my desk. There was a press release a year or so ago from Teledyne where they disclosed the steering concept. It used and magnetostictve material (Terfinol) to actuate the rear fins. Aha! I figured it was either piezoelectric or Terfenol-D. But I worked on a project at Wasino (now Amada Machine Tools) for turning elliptical pistons using a Terfenol actuator, and we had to apply a lot of electronics and programming to overcome the hysteresis. In fact, that's what eventually killed the project. -- Ed Huntress I suspect Telidyne used an on off control and aero surface PWM to get some sort of proportional control. That sounds reasonable, and would self-correct the hysteresis problem. IIRC, the material has a response rate of around 10 kHz, or maybe it's 20 kHz. The hysteresis is non-linear; it will respond to a reverse signal quickly, but to a diminished degree. And the non linearity itself varies, non-linearly, with the *size* of the signal. It made for a real programming mess. After the consulting engineers tried for six months to do it with equations, we built a look-up table and it worked pretty well. But then the control was too slow. It was a sticky problem. -- Ed Huntress Check your email listed on this system |
Steerable bullet
On Thu, 14 May 2015 07:36:51 -0700 (PDT), Dan
wrote: On Tuesday, May 12, 2015 at 5:21:39 PM UTC-7, Ed Huntress wrote: On Tue, 12 May 2015 15:15:54 -0700 (PDT), Dan wrote: On Tuesday, May 12, 2015 at 2:38:02 PM UTC-7, Ed Huntress wrote: On Tue, 12 May 2015 14:23:38 -0700 (PDT), Dan wrote: On Tuesday, May 12, 2015 at 2:02:10 PM UTC-7, Ed Huntress wrote: On Tue, 12 May 2015 16:51:30 -0400, Tom Gardner wrote: On 5/12/2015 12:50 PM, Ed Huntress wrote: Eyes getting old? Having trouble hitting the ten ring? Are those running pronghorns just too jumpy for you these days? DARPA's .50 cal EXACTO bullets may be just what you need. Don't shoot it and then forget it; just shoot it, and then steer it: http://tinyurl.com/lkyjp9f ALL my bullets are steerable...until they leave the tube! Steerable...but are they steered? g This is a very weird thing. How thay got that optical communications and mechanical steering technology into a .50 cal bullet, I can hardly imagine. -- Ed Huntress I was the Guidance and Control Manager for my companies' proposal for the original EXACTO BAA. We lost but it was a lot of fun. It was huge technology risk to make it all work. I still have the Stero-Lithogrphy bullet concept and a actuator control demonstrator on my desk. There was a press release a year or so ago from Teledyne where they disclosed the steering concept. It used and magnetostictve material (Terfinol) to actuate the rear fins. Aha! I figured it was either piezoelectric or Terfenol-D. But I worked on a project at Wasino (now Amada Machine Tools) for turning elliptical pistons using a Terfenol actuator, and we had to apply a lot of electronics and programming to overcome the hysteresis. In fact, that's what eventually killed the project. -- Ed Huntress I suspect Telidyne used an on off control and aero surface PWM to get some sort of proportional control. That sounds reasonable, and would self-correct the hysteresis problem. IIRC, the material has a response rate of around 10 kHz, or maybe it's 20 kHz. The hysteresis is non-linear; it will respond to a reverse signal quickly, but to a diminished degree. And the non linearity itself varies, non-linearly, with the *size* of the signal. It made for a real programming mess. After the consulting engineers tried for six months to do it with equations, we built a look-up table and it worked pretty well. But then the control was too slow. It was a sticky problem. -- Ed Huntress Check your email listed on this system Well, that's not my real email. For the real one, take the listed one: ....and remove the "3". -- Ed Huntress |
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