Zog-43 the Newsletter Ofnarhams, NAR Section #139 NAR National Champions 2001, 2004
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Zog-43 The Newsletter ofNARHAMS, NAR Section #139 NAR National Champions 2001, 2004 Jul/Aug 2014 Vol 36 Number 4 Jim Filler's Saturn V launch at the Apollo Goddard Contest in honor of the 45th Anniversary of the Apollo Moon Landing. (photo by Ed Pearson) IN THIS ISSUE: Attack on Ft McHenry ECRM Coverage Sport Launches Coverage Part 3 of Jim Barrowman Interview and more! JUL/AUG 2014 PAGE 1 Zog-43 Welcome New Members Volume 36 Number 4 David Marquez Jul/Aug 2014 Charles Davis Official NARHAMS Newsletter Editor: Jennifer Ash-Poole Welcome Renewing Members ZOG- 43 is dedicated to model rocketeers ofall ages, abilities, and Jim Baird interest. We are committed to providing the most current, up-to-date information on model and real world rocketry, and to provide educational material, as well as, entertaining information. ZOG ROYAL COURT (NARHAMS OFFICERS) ZOG-43 is published bi-monthly and is available to anyone on a ZOG (President) Alex Mankevich subscription basis: $10 for email; $15 for meeting pickup; $20 for US postal mail delivery. VICEZOG (Vice-President) Frank Panek Material in ZOG -43 is copyrighted. Free and unlimited reproduction is COLLECTOROFTHEROYAL TAXES granted with the proper credit to the author and/or ZOG-43. (Treasurer) Maria Ha Ifyou have any questions about ZOG- 43, NARHAMS, subscriptions, KEEPEROFTHEHOLY WORDS (Secretary) or ifyou have any comment(s), correspondence, or ifyou’d like to Chris Kidwell submit an article, send them to: ZOG-43 COURT JESTER (Section Advisor) Mark Wise 1404 Sweet Cherry Court Severn, MD 21144 E-Mail us at: [email protected] About NARHAMS The National Association ofRocketry Headquarters Astro Modeling Section, or NARHAMS, serves Baltimore, the state ofMaryland., Washington, DC and the surrounding Metropolitan areas. The club is a section (#139) ofthe National Association ofRocketry (NAR). We are the oldest continuously active model rocket club in the United States, first established as a high school club in 1963, changing our name to NARHAMS when chartered as a NAR section in 1965. NARHAMS is the only seven time winner ofthe NAR “Section ofthe Year” award (1997, 1998, 1999, 2001, 2004, 2006, and 2007). NARHAMS members regularly fly their model rockets at NASA’s Goddard Space Flight Center in Greenbelt Md, at Old National Regional park near Mt. Airy, Md. and at the Carroll County Agriculture Center, near Westminster, Md. NARHAMS welcomes all to our monthly meetings and launches. For details, dates and directions to our club, meetings and launches, go Security Officer Hampton retrieves a model caught on to: the fence at the monthly Goddard launch (7/6/14). (photo by Ed Pearson) http://narhams.org JUL/AUG 2014 PAGE 2 The Rocket That Attacked Fort Detail from Plate 13 ofCongreve’s McHenry in 1814 1814 publication “The Details ofthe Alex Mankevich - NAR# 86018 ; NARHAMS – Rocket System”. President ; March 2014 A selection ofCongreve 9 pounder to 32 pounder rockets with both conical This September marks the 200th anniversary ofone ofthe and explosive warheads. The 32 more profound events in USA rocketry history. I refer of pounder “Carcass” was used in the course to the British attack on Fort McHenry in Baltimore, attack on Fort McHenry and carried Maryland beginning on September 13, 1814. Most an incendiary charge. The stabilizing Americans are aware that this battle’s rocket barrage was stickon the 32 pounder rocket is 15 the inspiration for Francis Scott Key’s poem which later feet long. became our national anthem. The rockets producing the “red glare” were the ship-launched Congreve rocket. Propulsion: Sir William Congreve: The Congreve rocket’s propellant was contained by an The British Royal Laboratory at Woolwich Arsenal in iron metal casing lined with cartridge paper glued to the 1801 began a military rocket research and development interior walls to serve as a barrier against metal corrosion. program with William Congreve tasked with improving The casing was capped at the aft end by a convex disk of the accuracy and effectiveness ofa rocket bombardment. gun metal. An exhaust port perforated the center ofthe Congreve (1772 – 1828) imparted an appreciable level of base cap to permit the propelling gases to escape. The scientific and industrial sophistication to the large-scale exhaust port’s diameter was about one-third ofthe 4 inch manufacture ofmilitary rockets. He published three books diameter ofthe base cap. Above the base cap was a fine promoting his rockets from 1804 to 1827, but he didn’t clay plug also bearing a hole at its center (much like metal patent his rocket designs. Congreve was elected a Fellow washer). Another fine clay plug sealed in the propellant ofthe Royal Society in 1811 for his work on rocketry. composition at the casing’s fore end. A circular cavity tapering toward the fore end was either molded or bored Design ofthe Congreve Rocket: most ofthe way through the center ofthe propellant The Congreve design was basically a wooden stabilizing composition. By virtue ofits geometrical shape, the stick about 15 to 16.5 feet long by 1.5 inches wide cavity improves and regulates the thrust generated by the mounted to a cylindrical-shaped iron casing ofabout 42 burning propellant. The circular and tapered profiles of inches in length and about 4 inches in diameter. The the central cavity should have allowed the Congreve length ofthe stabilizing stick was roughly 50 times the motor to develop its thrust progressively. diameter ofthe casing. Both conical and blunt-shape nose cones served as the ballistic cap. Congreve designed Congreve’s “rocket composition” propellant reportedly several different rocket sizes from 3 to 300 pounds. Ifyou composed of75 parts saltpeter (potassium nitrate), 15 can imagine a modern day bottle rocket on steroids then parts charcoal and 10 parts sulfur. This mixture was you have a serviceable grasp ofthe Congreve rocket similar to gunpowder, but proportioned for a slower burn design. Some citizens ofStonington, Connecticut time. It’s unlikely that the Congreve rocket would have following the British attack onAugust 9 – 12, 1814 immediately rocketed skyward upon ignition. The gathered some unexploded Congreve rockets for combustion dynamics ofthe early solid rocket motors inspection: were poorly understood. Aside from their low energy “Some ofthe rockets were sharp pointed, others not, made output, the early gun powder-based rocket motors had a ofsheet iron very thick, containing at the lower end some poor rate ofthrust development and an unsteady burn rate. ofthem a fusee [sic] ofgrenade, calculated to burst, and if they were taken hold ofbefore the explosion, might prove Ignition: dangerous; one or two persons received injury in this way. The British Royal Navy favored igniting the propellant by They appear to contain a greater variety ofcombustibles a brass flintlock mechanism attached to a cord. The than the fire carcasses.” JUL/AUG 2014 PAGE 3 British Artillery utilized a paper fuse filled with a the trough. The A-frame style launch system was adjusted combustible mixture which was known as a port-fire. to the desired degree ofelevation. Abenefit ofthe This was secured to a port-fire holder, the port-fire was lit, launching frame is that it could easily be transported and then held near a vent at the lower end ofthe rocket across a wet, muddy field that would otherwise hinder the casing. transport ofheavy cannons. Launches from a flotilla ofbarges utilized the vessel’s The Congreve rocket had been noted to sputter and smoke foremast to support a ladder-like launching frame, which on the launch apparatus for some seconds before it took was raised and lowered to the desired trajectory by rope flight. General Cavalié Mercer wrote in his “Journal of lines called halyards. The mainsail was wetted against the Waterloo Campaign” about the sequence following the sparks, and set to protect the crew from the rocket’s ignition ofa Congreve rocket: exhaust flame and smoke. “... the rocketeers had placed a little iron triangle in the road with a rocket lying on it. The order to fire is Larger war ships employed a rocket battery installed given, a port-fire applied, the fidgety missile begins below the main deck. The rockets were fired through an to sputter out sparks and wiggle its tail for a second array ofspecial openings called scuttles, which are ports or so, and then darts forth straight up the chaussee.” angled upwards from the ship’s interior and out through Detail from Plate 11 ofCongreve’s the sides. The hot exhaust ofthe rocket was deflected by 1814 publication “The Details of iron shutters fitted to the scuttles. A rocket ship would the Rocket System”. Congreve come to anchor with its scuttles aimed towards their rockets being launched from a enemy’s fort and batteries before launching its rockets. rocket battery below the main deck through the scuttles and out Flight Stability, Range, Reliability and Accuracy: the ship’s sides. The Congreve rocket’s flight trajectory could be guided by adjusting the launching frame to varying degrees of Warhead: elevation. Trials testing the 32 pounder Congreve rocket The Congreve rocket was designed for various warheads, revealed that launching at a 55 degree elevation produced incorporating explosive (shell), shrapnel (case shot), and the maximum range ofabout 3,000 yards (1.7 miles). incendiary (carcass) variations. The explosive and Based upon Congreve’s instructions for trimming the shrapnel types ofwarheads were effective against troops warhead’s external fuse (which was ignited when the in an open field without the protection ofa fort or rocket fires), the rocket likely had a flight time not earthworks, and could be launched to disrupt the orderly exceeding 25 to 30 seconds. operations ofmilitia and cavalry. The incendiary warhead was effective when targeted against wooden buildings and AU.S.