2009-03-31 CC Agenda & Packet - Laserfiche WebLink

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AII of the Information received will make your event fall under NFPA 1122. Chapter 4. Because of the size of the motors (type C) the launch site will need a minimum site dimension of 400 ft. For a circular area, the minimum launch site dimension shall be the diameter: and for rectangular area, it shall be the shortest side. Spectator distance: All persons shall remain at least 15ft from the model rocket during Ignition of a model rocket motor with an installed total Impulse of 30 N-sec or less. If you would send me a site plan meeting these requirements. I will sign off on It so you can add It to you packet to the city. Thank You, David Bruder Fire Inspector Centennial Fire District 651-784-7472 From: Nelson, Tom [mallto:tnelson@erlcksenroed.com] Sent: Thursday, March 19, 2009 10:02 AM To: David Bruder; Jerry streich Cc: TBender@centervlllemn.com SUbject: RE: cub scout rocket launch Mr. Bruder, Hopefully this answers your questions thoroughly enough: 1. The rockets are made from kits bought In any hobby shop (Estis brand comes to mind) composed of a cardboard tube (like a paper towel tube) with usually plastic or balsa wood nosecone and fins. 2. The rocket weight I've been looking at range from about 1 oz. to about 4 oz. and are between 8" to 18" tall. 3. We wlll be using A, 8. or C type commercially available motors Max Impulse: A type: 2.5 newton-seconds B type: 5.0 newton-seconds C type: 10.0 newton-seconds 4. We launch from standard commerCially available tripod stand (see #6 below). We usually place a 4' x 4' piece of plywood (or something ofthe like) under the tripod so we get a nice. level surface with less likelihood of tipping over. Again, we would like to have the fleXibility of plaCing this launch area on a grassy area, but if you wanted to have us shoot from the gravel/dirt/clay baseball diamond infield - then we would oblige. In any case we plan . to launch near the middle of the park - which gives us a better chance of recovery w/ln the park grounds. laMotte park has the baseball diamonds near the center of the park grounds. 5. I guess that Is more of a question of what you would require. Normally the kids using the launch control is about 10'-12' away from the rocket (which Is the length of the controller chord). Spectators and kids that aren't launching are kept about 20'-30' back. 6. The type of launchers we use are the standard commercially available launch pads. They normally have a tripod base with a metal rod (2' long or so) sticking up that acts as a track to get the rocket going In the right direction. The pad has a horizontal metal plate that the rocket sIts on as it Is fired. The flre/exhaust/thrust from the rocket hits against this plate. 7. Ignition system Is comprised of: a) handheld controller: 2