fJ0 00g0fg0 SPECIAL FLIGHT Dennis Kryway 1440 Millikens Bend Rd Herndon VA 22070 THIS COLUMN represents another first Academy Model Aeronautics order continue bring best modeling column will cover aspects model rocketry beginning FAT world-class competition continuing through just plain flying fun will emphasize FAI flying simply because toughest form model rocket competition anywhere Anything learned competition can easily applied adapted other type model rocket flyinghobby otherwise addition some lightweight building techniques discussed column can applied other forms aeromodeling wonderful thing about hobbyists involved aerosports willingness show what Believe lot talented modelers out willing share knowledge benefit hobby well sport Lets start events brief description models flown eighth World Championship held Kiev Ukraine events follows oSI aAltitude S3aParachute Duration 54bRocket-Boosted Glider S5 cScale Model Altitude S6aStreamer Duration S7 aScale Model 58eRocket-Boosted Glider radio control allowed models built compete Sla S3a 56a largely made fiberglass cloth impregnated epoxy polyester resins Fins made balsawood reinforced epoxy fiberglass Under current rules model must no less 350mm 1378 long least 50 percent total length measuring 30mm 1181 in diameter measurements apply airframe nose cone Fins count toward overall length width generally tacked place CyA cyanoacrylate glue after careful positioning thin bead epoxy used anchor place Although no minimum maximum weight restrictions model itself weight parachute model usually between 38 55 grams spread weight occurs because some modelers like use longer 30mm section larger parachute can stuffed airframe weight 56a Streamer model generally runs between 36 grams 42 grams spread found caused primarily differences between materials available worldwide 51 two-stage Altitude models vary greatly weight because nose cone weight used upper stage keep center-of-gravity ahead center pressure thereby ensuring model stability Recovery devices tracking aids weights quoted 53a 56a include recovery devicesa parachute case 53a streamer 56anor include weight motor Several different materials used parachutes Eastern Europe popular material called Lavsan Lavsan acts looks feels like Mylar however aluminized higher visibility United States polyethylene plastic aluminized Mylar popular choices Thicknesses differ 00025 1/4 mil popular because its availability Parachute diameters will vary based upon weather conditions 28 32 seems European standard Shroud lines parachutes made fine O0 nylon silk thread occasionally fine Kevlar thread Streamers mandatory length-towidth ratio 10 1 usually made plastic film average size used about 5 x 50 inches however some competitors favor 6 x 60-in length thickness plastic films ranges 0005 really long wide streamers 001 shorter narrower ones streamer folded produce much drag possible order slow descent still react well thermals gain altitude streamer attachment line like shock line usually made thin Kevlar cord Sla Altitude two-stage model rocket lower stage 30mm diameter upper stage 10mm 12mm diameter object event achieve highest possible altitude visibly tracked Getting altitude therefore half problem tracker must able see model height its travel recent Cultural Affairs Spacemodeling contest between US USSR held Soviet pilot training air force base Kaluga Russia September 1991 winning altitude 860 meters 2821 feetover half mile high altitude achieved Alexander Miterov upper stage see photograph model about 6 long motor about 2 225 long remainder space inside model filled powder blown visible cloud top flight addition length 00025 aluminized Mylar 250 wide 10 15 ft long wound tight spiral inserted model along tracking powder apogee ministreamer serves insurance policy highly reflective surface will usually twinkle flash giving trackers something fix miss cloud tracking powder sport difficult participate enjoyed thousands children millions flights made year country alone see kit hobby store pick up try building model rockets about yearand no competition experience allwhen flew flyoffs Huntsville Alabama 1988 went take first place 53a Parachute Duration earned place go Romania 1989 Romania never hosted event World Championships postponed until June 1990 held USSR Another teammate never built model rocket before earned spot 56a Streamer Duration squad cultural exchange performance also earned him spot 56a squad replacement team member dropped off 1990 team Both us owe success Howard Kuhn Father Competition Model Rocketry took us under wing taught us build smarter model Next months column will feature glider models well Scale Scale altitude models also plan include photos drawing two Dennis Kryway member 1990 World Championship Spacemodeling team after less three years involvement model rocketry works advertising business negotiating radio television stations throughout United States 1992 67 Sla two-stage model ready launch Cultural Affairs Spacemodeling contest Kaluga Russia September 1991
