In this issue: Perazzi Classic results Re: Opinions on Walther rifles Re: contact info for RX Products in UK Re: simulator technology Re: Opinions on Walther rifles / Simulator and SUIS technology Re: Opinions on Walther rifles ******************************************************************** I have posted the Top 20 on my page. Again, my thanks to Anita North for arranging for the results to be faxed to me. If anyone can do the same for the upcoming Buenos Aires WC, please let me know. Thank you. Michael Ray, Editor ****************************************************************** I just returned from the Canadian SB Nationals in Calgary, and Wayne Sorenson shot a Walther KK rifle - the space gun. He did quite well, I thought, scoring in the 390's in every position, with his standing and kneeling scores only slightly lower than his prone scores. Don Williams, Oregon. ****************************************************************** Contact for RX products in UK: Mr Granville Jones, RX Products, 17 Davis Street, Aberaman, Mid-Glamorgan, wales, CF44 6UR Tel: +44 222 882126 Fax +44 222 883226 ****************************************************************** Scatt 4 IR LEDS are positioned on the target at the 12, 3, 6, 9 o'clock positions about 150mm from the 10m target. A small telescope is fastened on the rifle, pistol, cross bow, or bow. We'll talk about rifles here. It sits just under the barrel and points towards the target. The guts of the system is a photo detector in the telescope that is divided into 4 quadrants, If you look carefully down into the lens you will see the detector is a circle divided into quarters 12 to 6 and 3 to 9. By carefully aligning the telescope to the target and using the Scatt software you can then align the system at the target. The LEDs are focused onto the detector so that if the telescope was exactly aimed the LEDS would focus onto the 12, 3, 6 9 positions right over the edges of the quartered detector. Now if you imagine the rifle being exactly lined up then moved sideways a fraction, the top and bottom quadrants would change, say the left top gets less and the right top gets more, left bottom would get less and the right bottom would get more. If it was a movement horizontally that is. The electronics can be - (I'm not sure if they do this - this is my guess and the way I would set it up) - set up so that two opposing quadrants are fed to one amplifier and the other opposing sent to another. This will enable software to figure out which way the rifle has moved. This signal can be read and then displayed on the screen. Very simple explanation. Noptel This one is a little different. The IR Leds and the detectors are mounted on the rifle. There are two "telescopes". One focuses the leds towards the target and the other focuses the returned IR signal onto the detectors. At the target a retroeflector is mounted around the target. To the detecting telescope this will look like a light source at the target. The light image is then focused onto the detector and the same movement with the Scatt takes place and is electronically detected. The Noptel can be used with live firing even at 50m (at least) I suspect the signal may be enough to do longer distances as well. The scatt can only be used at 10m - Good for home practice but not really for live firing. I hear that the Noptel is able to simulate different winds. I am endeavouring to find out what the deflection that is programmed into the Noptel. I would be extremely interested because of the comments in the last newsletter re the 9-30 to 3-30 line etc. Ross Mason [Editor - I recently learned that Rika is coming out with a simulator similar to the Noptel design. It will also supposedly have trigger pressure and pulse monitors. All for nearly $1000! I'm quite curious how they manage all the same features plus more and are this inexpensive. I'm eagerly awaiting more info.] ****************************************************************** >What about the Walther KK free rifle (aka Space Gun), this is what my son >has his sights set on, however I've heard rumblings about quirks with this >rifle. Any insights? According to one of the testers at Eley, Walther brought six barrels for testing that produced the best groups he'd ever seen. Whether this is an accurate reflection of overall standards is another story; oh to have the clout to get a selected barrel ! The stock can be bought separately, and there is now a converter that allows an Anschutz 14/18/19-series action to be fitted to it. Hubert Bichler was an advert for Walther a year or so back, he'd just set a new German record with one. >Did you cover in any of the old issues the principle of operation (from >engineering point of view) for: >* Shooting Simulators - like the Noptel >* Electronic Targets - like the SIUS >Thanks, Eitan The SCATT system uses IR transmitters on the target, and a sensor on the rifle. The Noptel system uses a reflective target, or corner reflector prisms near the target, and a combined transmitter/receiver system on the rifle. The Noptel's main advantage lies in being able to use it at 50m (or even 300m with enough prisms) as well as indoors (Not to mention that it's easier to get things to Finland for repair than Russia). Suis-Ascor systems use two different systems, depending on calibre. For fullbore rifle, a bar contains microphones, and it's the sonic boom of the bullet passing through the air that's picked up by the microphones, and triangulated to locate where the round went. From personal experience on the systems installed on British Army ranges, the system isn't infallible, but is OK when properly calibrated. Smallbore rifle works by having a rubber sheet held taut, with a microphone at each corner that picks up the bullet passing through the rubber. The "target" is a hardboard square with a circular hole cut to allow sight of the black rubber. The rubber moves slightly after each shot. The 10m air (Spieth ?) work the same way - but with paper instead of rubber. Hence you should see a strip of black paper slowly growing underneath the target if it's working correctly. I know someone who suffered erroneous scores in a final when the paper jammed, the hole in the middle got larger, and the announced values went haywire. Martin Sinclair ****************************************************************** The English magazine "Target Sports" had a couple of articles on the new Walther KK Free rifle. There was one on the original broomhandle grip. The conclusion was that the rifle was fine but the grip was confining. Then there was one on the the Walther with the new pistol grip and the reviewer was most impressed. They also did a review on the Walther stock with an Anschutz action. The benefit of the lower line in prone was very apparent. The only point the reviewer was unimpressed with was the look of the Anschutz action in the stock. Apparently the action sits a toiuch high. I would imagine that the Walther stock for the Anschutz action should be available through Champion's Choice in Tenn. And you could always import it yourself, as we in Canada frequently have to do. Hope it helps. Oh, perhaps you can get a sample copy of Target Sports from: Target Sports, Peterson House, Northbank, Berryhill Industrial Estate, droitwich, Worcs., WR9 9BL ,Great Britain. fax: (01905) 795905. My only connection with them is as a subscriber. They have numerous articles on smallbore rifle, (air) pistol and target crossbow. They are now as technical as the American Rifleman was before it went political, but do good reviews of products. ****************************************************************** End of UIT Mailing List #34 Michael Ray - Systems Engineer Rose-Hulman Inst. of Tech. Rifle Coach UIT Shooting Page - http://www.geocities.com/Colosseum/1190/index.htm