AND IN THE center ring Well isnt threering circus Its fun reprise events 1988 1990 edition Johnson City Indoor competition includes 1990 Indoor World Championships June 4-6 1990 NFFS US Indoor Champs June 7-9 Theres morerunning concurrently USIC 1990 AMA Indoor Nats NFFS crew has solid track record under unequaled leadership Tony Italiano havent made plans go get Send business-sized SASE Tony Ital iano entry forms address 1655 Revere Dr Brookfield WI 53005 Flying opportunities following currently known contest dates California San Diego Monthly sessions Cat Howard Haupt 3860 Eco chee Ave San Diego CA 92117 Florida Miami Dr John Martin 2180 Ti gertail Ave Miami FL 33133 phone 1-305/858-6363 MIAMA Meet #6 May 12-13 1990 MacDill AFB Tampa Kansas Topeka TOPMAC Indoor Meet May 13 1990Club Record Trials Mini Contest Contact Jack Koehlar 3425 SW Arrow head Rd Topeka KS 666143845 phone 1-913/272-8439 Pennyplane rubber control Pennyplanes gen eral Novice Pennyplanes particular have problem rubber knots jamming fail ing unwind Under very high torque motor tends creep up hook regardless hooks design problem greatest Nov ice PP since limited prop diameter requires very long rubber loops Full Pennyplane props approach 20 in diameter require rela tively higher rubber cross section same rubber weight therefore loops shorter have less tendency bunch creep Classic rubber theory indicates maximum theoretical duration rubber-powered model will occur rubber weight twice air frame weight practical standpoint ra tio 131 easier handle yields about 95% maximum theoretical duration try accommodate 39 grams rubber very short Pennyplane fuselage will definitely problems Anticreep antibunch techniques two successful suggestions Ive received vertical hooks rubber-tubing sleeves photos rear hook modified prevent jamming Don Lindley suggested making hook vertical bar shown locating 0-ring halfway up bar knot bunching rear usually completely eliminated same photo small horizontal barrier shown re duced didnt eliminate rubber bunching Another photo shows close-up experi mental front hook Its very narrow se vere reverse twist end doesnt seem pos sible rubber creep hook creeps far enough can jam against fu selage Before ask horizontal bar photo pin used make prop hold still Another photos shows best solution far short length surgical tubing slipped over both hook end rubber visible under sleeve plastic 0-ring has squeezed oval shape fit inside tubing Handling rubber sleeve Wait until mo tor has made up weighed lubed before installing rubber sleeve eas ily done using long narrow hook grabs 0-ring tubing can pulled over motor During winding sleeve will loose enough move around motor Before un hooking motor winder torquemeter slide sleeve forward enough cover half 0-ring Handle prop end motor carefully hook upit very easy make sleeve slide forward enough completely cover 0-ring happens get help un wind motor Once motor model slide sleeve forward slightly shown photo Pennyplane evolution first Indoor model built several years Novice Pennyplane shown its box page 62 October 1988 issue MA model built ex cuse go 1988 USIC incorporated several experimental design features Jim Clem have worked closely together over years thoroughly tested number ideas worked Out Jims model nearly identical innovations has placed top five three USIC meets has set Category II records Trials tribulations 1988 best could new Novice PP about nine minuteswell below 12-plus minutes needed get top five done lucky flight using piece decent rubber proper size range lucky because loop really needed about inch longer flight rubber didnt bunch up rear hook Continued fly ing Category sites ceiling height less 26 ft 3 shed no lightthe low ceiling perform ance good could expect worry ing about bunching problem told myself Better rubber answer Tan rubber will save day No guess Continued testing 1989 USIC underlined absolute importance eliminating rubber bunching rebuilt nose section modified rear hook now possible use what ever rubber size wanted fully loaded bunching results measur ably better June 1990 73 Free Flight Indoor Bud Tenny Box 545 Richardson TX 75090 Jack McGiilivray went out save pre cious balsa wood nice Easy B design TOWN eliminate bunched Knots once re place standard hook vertical post Continued page 174 Federation ROG held pioneer model avia tor Joe Krush 1989 USIC Valise photo severe reverse twist combined very small hook help reduce rubber creep Small surgical rubber tubing prevents rub ber creep jammed knots front end Four Great Days Oshkosh WI Wlttman Field Over 30 Manufacturers & Dealers Indoors hOME OF TIlE ERA T TIE EAR MUSEUM WUrrMAH puELD KOS ALLY OF GIANTS jggO AIIOCIOU@fl inc Complete Information write CUflCH Bluffs IA 51W3 IiVIAAS 10th ANNIVERSARY FUI4FLY JunO 28-29-30 July 11990 IMAA Sanctioned 107 Wildwood Dr Versailles KY 40383 tel 1606/873-7554 Desert Union Sailplane Thermalists Palm Springs CA DUST rejuvenated club back publishing its Dust Devil newsletter has joined southern California Soaring clubs competition circuit David Hall news letter editor can contacted 3030 Cypress Rd Palm Springs CA 92262 tel 1-619/ 320-58 14 Seattle Area Soaring Society recently re formed club up 50 members going strong Waid Reynolds editor SASS Up draft newsletter can reached 12448 83rd Ave So Seattle WA 98178 tel 1-206/772029 1 SWIFT club Omaha NE area new club organized February has no dues started things off right foot coming AMA chartered club #2749 Its Vis ible Lift newsletter edited Ron Ponec can reached via PO Box 174 Elkhorn NE 68022 always appreciate receiving club newsletters since best way keeping touch whats happening Soaring around country Editors please send home address listed top column Model Aviation editorial offices FF Indoor/Tenny Continued page 73 So what wrong learned good tan rubber seemed to wind ef fectively model still required immensely larger amount power Jims very similar model no clue exact reason High drag After USIC carefully examined model thiniring terms what would ab sorb energy during power burst model trimmed wing very far forward leaving small angular difference between wing stab incidence However repairs early tail boom damage left some positive cidence relative motor stick centerline wing also positive incidence addition model behaved fin area too small pronounced Dutch roll during sev eral phases flight Normal trim accommo date high torque included some left thrust no downthrust significant amount wing offset several degrees washin/washout twist Operation streamline new tail boom fin built fin area concen trated farther aft socket plug-in boom removed reinstalled give slight negative stab incidence allowing wing incidence reduced zero relative stick centerline Virtually washin/washout twist between tip dihedral breaks re moved small equal amount washout put tip prevent possibility tip stall model now climbed cleanly low ceil ings lower torque cruised nose-up titude very slightly lower cruise torque Ready Nats quite Idahos Kibbie Dome could get model higher expense too much rubber climb very clean smooth almost no Dutch roll fact very long heavy loop made scrub big acoustical tiles ceiling lucky get Uiii~ 1/4-SCALE PLANS FROM FACTORY BLUEPRINTS See Scale RIO Modeler October 88 Wing Loading 18 ozs Span 78 inches Weight 825 lbs Area 1053 inches 46-61 2/Cycle Plans rolled manual Spaceman decals $3000 PPD Cowls pants Fiberglass Master Dry Ridge Models 59 McCurry Road704 658-2663 Weaverville NC 28787 back could have lost top tile way out reach dead-sticked prop locked glided 135 total just over eight min utes Now good idea what power use got flight just over 10 minutes ran out time contest ended power going Texas high ceiling 1000 miles away few minutes high-ceiling flying time left 1989 Next chance Johnson City 1990 two possible culprits thick airfoil section center wing props Jim Clem loaned props weighed same Several quick test flights motors documented per formance props showed no major differ ences using Jims prop has wing Tune later see new wing solves problem Balsa expensive Canada least thats reason Jack McGillivray gives Easy B has three wing ribs no stab ribs see photo Chilton building techniques know Stan Chilton aware high level crafts manship models have Behind craftsman ship some unusual improved building practices Motor stick hints motor stick Indoor Rubber models heavier crit ical components After choosing balsa sheet straight uniform grain correct den sity Stan cuts blank wider needed instead using exact width match diameter form bevels edge sheet before soaking water 1/4 Scale Kits $12995 Epoxy/Glass/Foam Construction Drawings Data Formula 120 Pylon Sport Standoff ScaleKit Price ping Credit Cards WelcomedOhio Residents Add 7% 174 Model Aviation CAPACITIVE-DISCHARGE IGNITION featuring IBO1lALLX QInlIHLLEfl EABl ADVANCEIII No moving parts No engine modifications Basic unit $ 9995 Opposedcylinder twin $ 11995 Fald BCoiaWadShoe lee After soaking sheet Stan wraps sheet form beveled edge inside using rubber-model silkapan instead tissue al lows edges wider blank overlap form After baking assembly kit chen oven cuts through tissue over lap using straightedge guide resulting edges glue seam fit perfectly requir ing less glue good joint Before making joint preglues sur faces mated using very thin glue applied artists brush resulting joint al invisible lightest possible make Another important practice use shrinkable Teflon tubing available electronics sup pliers motor-stick form glued motor tube wont stick form during sembly Before removing tube form Stan adds spiral wrap boron fiber under ten sion improve torsional strength boron attached using nitrocellulose cement Using boron novice Extreme care must used cutting preventing minute broken particles escaping work surface Bill Warner some penetrating observations substance Indoor Scale columns couple years ago RMcM Prop trim Stans props checked bal ance pitch angle tracking assure wobblefree operation Initially individual pieces matched weight strength helps en sure static balance finished prop Pre cisely checking blade angle major antiwobble factor Stan checks tracking sure both blades same plane As re sult Stans props exceptionally smooth run ning Surface grinding US Indoor wood sup pliers compete strongly creating smoothly cut balsa sheets uniform thickness However perfect sheet still has surfaces raw wood Stan Chilton uses surface grinder smooth both sides balsa sheet making slightly thinner balsa lighter stiffer stronger after treatment mechanism under stood has postulated lignin wood has melted thin sheet web strengthens wood much like compos ite structures used full-scale airplanes Stan grinds finished sheets 00115 thick ness FiD models 0010 Indoor Stick rhis technique also corrects balsa sheets un ven thickness salvaging otherwise un istisfactory quality Jnusual Federation ROG Joe Krush man see about flying Philadelphia area ovel Federation ROG model shows hasnt st pioneering spirit see photo tion/Murphy tontinued page 75 ramework model Litespan weighs about z per sq ft com ared heavier films such opaque white onoKote 25 oz silver 20 oz heet has shiny side rather satiny side ihich provides additional choice surface heens Usage suggested both rubber- low-powered models Other claims irtight waterproof resistant glow diesel iels can doped painted comes eets measure 20 x 36 sell 350 per sheet Balsaloc $350 per 110-gram Lr need include shipping charge $3 tr order Idealair 21 Simcoe Road 10 Al ston Ontario LOM LAO Canada Well figures stuff mentioned previous paragraph came poop sheet arrived some samples products course sounded good try own hand applying Earl Poynter Fort Worth TX previously sent number sheets Litespan ventured use yet failed send canned pep talk bolster enthusiasm Any way better late never some wing-flex problems last year using plastic films some weakly stressed Nos talgia Gas designs replaced old film cov ering standard tissue- silkspan-and-dope coverings past fall winter come conclusion films great con struction methods frameworks themselves rigid enough permit use lesstaut plastic coverings reverted tradi tional covering procedures better skin-stress properties some problem models Since just completed building Pee Wee 30 model rather rigid semigeodetic wing stab construction felt would serve guinea pig evaluating Litespan selected semitransparent yellow color application wing since already completed covering stab yellow silkspan weight used Rubber models already applied suffi cient dope Basically found Litespan easy apply quite oblivious high heat case some films material did shrink great deal wrinkles loose ar eas pretty well stretched out heat-sealing perimeter panel framework wing tried both Balsaloc well thinned white glue found little difference adhe sive properties either Also could reheat June 1990 175 Computers Systems Manager Requirements o Excellent communication skills Management Experience Knowledge Prime 2550 DEC PDP 11/73 PC Lan o Familiar Primos Infobasic Seek Novell Dbase RSTS Word 11 RTFILE AMA looking professional manager ex perienced programming databases join staff will manage direct improve enhance technical support activities well develop long-range plans future growth qualified per son preferred however would consider results-oriented person would grow us Candidates should send detailed resume cover letter salary requirements Personnel Manager Academy Model Aeronautics 1810 Samuel Morse Drive Reston Virginia 22090 Principals Only Equal Opportunity Employer JL Made America American Technology RJL Manufactures USA RJL RIC & U/C ENGINES 15 thru 61 Forster Glow & Ignition Engines FACTORY PARTS & SERVICE FOR HB Engines Cox Conquest 15 Kraft 61 Taipan 40 HGK Engines Testor/McCoy Series 21 Forster Remco Viking twin Cafl urte free information RJL industries PO Box 5 Sierra Ma&e CA 91025 818 359-0016 G Modelers amoice - High Quality enient Size Modest Price Jr Kwik Set Epoxy 5 oz $695 Gas Model Products 3773 Russet Dr Cincinnati OH 45239 dealer call 513-385-7398 order direct add $250 postage
Edition: Model Aviation - 1990/06
Page Numbers: 73, 174, 175
AND IN THE center ring Well isnt threering circus Its fun reprise events 1988 1990 edition Johnson City Indoor competition includes 1990 Indoor World Championships June 4-6 1990 NFFS US Indoor Champs June 7-9 Theres morerunning concurrently USIC 1990 AMA Indoor Nats NFFS crew has solid track record under unequaled leadership Tony Italiano havent made plans go get Send business-sized SASE Tony Ital iano entry forms address 1655 Revere Dr Brookfield WI 53005 Flying opportunities following currently known contest dates California San Diego Monthly sessions Cat Howard Haupt 3860 Eco chee Ave San Diego CA 92117 Florida Miami Dr John Martin 2180 Ti gertail Ave Miami FL 33133 phone 1-305/858-6363 MIAMA Meet #6 May 12-13 1990 MacDill AFB Tampa Kansas Topeka TOPMAC Indoor Meet May 13 1990Club Record Trials Mini Contest Contact Jack Koehlar 3425 SW Arrow head Rd Topeka KS 666143845 phone 1-913/272-8439 Pennyplane rubber control Pennyplanes gen eral Novice Pennyplanes particular have problem rubber knots jamming fail ing unwind Under very high torque motor tends creep up hook regardless hooks design problem greatest Nov ice PP since limited prop diameter requires very long rubber loops Full Pennyplane props approach 20 in diameter require rela tively higher rubber cross section same rubber weight therefore loops shorter have less tendency bunch creep Classic rubber theory indicates maximum theoretical duration rubber-powered model will occur rubber weight twice air frame weight practical standpoint ra tio 131 easier handle yields about 95% maximum theoretical duration try accommodate 39 grams rubber very short Pennyplane fuselage will definitely problems Anticreep antibunch techniques two successful suggestions Ive received vertical hooks rubber-tubing sleeves photos rear hook modified prevent jamming Don Lindley suggested making hook vertical bar shown locating 0-ring halfway up bar knot bunching rear usually completely eliminated same photo small horizontal barrier shown re duced didnt eliminate rubber bunching Another photo shows close-up experi mental front hook Its very narrow se vere reverse twist end doesnt seem pos sible rubber creep hook creeps far enough can jam against fu selage Before ask horizontal bar photo pin used make prop hold still Another photos shows best solution far short length surgical tubing slipped over both hook end rubber visible under sleeve plastic 0-ring has squeezed oval shape fit inside tubing Handling rubber sleeve Wait until mo tor has made up weighed lubed before installing rubber sleeve eas ily done using long narrow hook grabs 0-ring tubing can pulled over motor During winding sleeve will loose enough move around motor Before un hooking motor winder torquemeter slide sleeve forward enough cover half 0-ring Handle prop end motor carefully hook upit very easy make sleeve slide forward enough completely cover 0-ring happens get help un wind motor Once motor model slide sleeve forward slightly shown photo Pennyplane evolution first Indoor model built several years Novice Pennyplane shown its box page 62 October 1988 issue MA model built ex cuse go 1988 USIC incorporated several experimental design features Jim Clem have worked closely together over years thoroughly tested number ideas worked Out Jims model nearly identical innovations has placed top five three USIC meets has set Category II records Trials tribulations 1988 best could new Novice PP about nine minuteswell below 12-plus minutes needed get top five done lucky flight using piece decent rubber proper size range lucky because loop really needed about inch longer flight rubber didnt bunch up rear hook Continued fly ing Category sites ceiling height less 26 ft 3 shed no lightthe low ceiling perform ance good could expect worry ing about bunching problem told myself Better rubber answer Tan rubber will save day No guess Continued testing 1989 USIC underlined absolute importance eliminating rubber bunching rebuilt nose section modified rear hook now possible use what ever rubber size wanted fully loaded bunching results measur ably better June 1990 73 Free Flight Indoor Bud Tenny Box 545 Richardson TX 75090 Jack McGiilivray went out save pre cious balsa wood nice Easy B design TOWN eliminate bunched Knots once re place standard hook vertical post Continued page 174 Federation ROG held pioneer model avia tor Joe Krush 1989 USIC Valise photo severe reverse twist combined very small hook help reduce rubber creep Small surgical rubber tubing prevents rub ber creep jammed knots front end Four Great Days Oshkosh WI Wlttman Field Over 30 Manufacturers & Dealers Indoors hOME OF TIlE ERA T TIE EAR MUSEUM WUrrMAH puELD KOS ALLY OF GIANTS jggO AIIOCIOU@fl inc Complete Information write CUflCH Bluffs IA 51W3 IiVIAAS 10th ANNIVERSARY FUI4FLY JunO 28-29-30 July 11990 IMAA Sanctioned 107 Wildwood Dr Versailles KY 40383 tel 1606/873-7554 Desert Union Sailplane Thermalists Palm Springs CA DUST rejuvenated club back publishing its Dust Devil newsletter has joined southern California Soaring clubs competition circuit David Hall news letter editor can contacted 3030 Cypress Rd Palm Springs CA 92262 tel 1-619/ 320-58 14 Seattle Area Soaring Society recently re formed club up 50 members going strong Waid Reynolds editor SASS Up draft newsletter can reached 12448 83rd Ave So Seattle WA 98178 tel 1-206/772029 1 SWIFT club Omaha NE area new club organized February has no dues started things off right foot coming AMA chartered club #2749 Its Vis ible Lift newsletter edited Ron Ponec can reached via PO Box 174 Elkhorn NE 68022 always appreciate receiving club newsletters since best way keeping touch whats happening Soaring around country Editors please send home address listed top column Model Aviation editorial offices FF Indoor/Tenny Continued page 73 So what wrong learned good tan rubber seemed to wind ef fectively model still required immensely larger amount power Jims very similar model no clue exact reason High drag After USIC carefully examined model thiniring terms what would ab sorb energy during power burst model trimmed wing very far forward leaving small angular difference between wing stab incidence However repairs early tail boom damage left some positive cidence relative motor stick centerline wing also positive incidence addition model behaved fin area too small pronounced Dutch roll during sev eral phases flight Normal trim accommo date high torque included some left thrust no downthrust significant amount wing offset several degrees washin/washout twist Operation streamline new tail boom fin built fin area concen trated farther aft socket plug-in boom removed reinstalled give slight negative stab incidence allowing wing incidence reduced zero relative stick centerline Virtually washin/washout twist between tip dihedral breaks re moved small equal amount washout put tip prevent possibility tip stall model now climbed cleanly low ceil ings lower torque cruised nose-up titude very slightly lower cruise torque Ready Nats quite Idahos Kibbie Dome could get model higher expense too much rubber climb very clean smooth almost no Dutch roll fact very long heavy loop made scrub big acoustical tiles ceiling lucky get Uiii~ 1/4-SCALE PLANS FROM FACTORY BLUEPRINTS See Scale RIO Modeler October 88 Wing Loading 18 ozs Span 78 inches Weight 825 lbs Area 1053 inches 46-61 2/Cycle Plans rolled manual Spaceman decals $3000 PPD Cowls pants Fiberglass Master Dry Ridge Models 59 McCurry Road704 658-2663 Weaverville NC 28787 back could have lost top tile way out reach dead-sticked prop locked glided 135 total just over eight min utes Now good idea what power use got flight just over 10 minutes ran out time contest ended power going Texas high ceiling 1000 miles away few minutes high-ceiling flying time left 1989 Next chance Johnson City 1990 two possible culprits thick airfoil section center wing props Jim Clem loaned props weighed same Several quick test flights motors documented per formance props showed no major differ ences using Jims prop has wing Tune later see new wing solves problem Balsa expensive Canada least thats reason Jack McGillivray gives Easy B has three wing ribs no stab ribs see photo Chilton building techniques know Stan Chilton aware high level crafts manship models have Behind craftsman ship some unusual improved building practices Motor stick hints motor stick Indoor Rubber models heavier crit ical components After choosing balsa sheet straight uniform grain correct den sity Stan cuts blank wider needed instead using exact width match diameter form bevels edge sheet before soaking water 1/4 Scale Kits $12995 Epoxy/Glass/Foam Construction Drawings Data Formula 120 Pylon Sport Standoff ScaleKit Price ping Credit Cards WelcomedOhio Residents Add 7% 174 Model Aviation CAPACITIVE-DISCHARGE IGNITION featuring IBO1lALLX QInlIHLLEfl EABl ADVANCEIII No moving parts No engine modifications Basic unit $ 9995 Opposedcylinder twin $ 11995 Fald BCoiaWadShoe lee After soaking sheet Stan wraps sheet form beveled edge inside using rubber-model silkapan instead tissue al lows edges wider blank overlap form After baking assembly kit chen oven cuts through tissue over lap using straightedge guide resulting edges glue seam fit perfectly requir ing less glue good joint Before making joint preglues sur faces mated using very thin glue applied artists brush resulting joint al invisible lightest possible make Another important practice use shrinkable Teflon tubing available electronics sup pliers motor-stick form glued motor tube wont stick form during sembly Before removing tube form Stan adds spiral wrap boron fiber under ten sion improve torsional strength boron attached using nitrocellulose cement Using boron novice Extreme care must used cutting preventing minute broken particles escaping work surface Bill Warner some penetrating observations substance Indoor Scale columns couple years ago RMcM Prop trim Stans props checked bal ance pitch angle tracking assure wobblefree operation Initially individual pieces matched weight strength helps en sure static balance finished prop Pre cisely checking blade angle major antiwobble factor Stan checks tracking sure both blades same plane As re sult Stans props exceptionally smooth run ning Surface grinding US Indoor wood sup pliers compete strongly creating smoothly cut balsa sheets uniform thickness However perfect sheet still has surfaces raw wood Stan Chilton uses surface grinder smooth both sides balsa sheet making slightly thinner balsa lighter stiffer stronger after treatment mechanism under stood has postulated lignin wood has melted thin sheet web strengthens wood much like compos ite structures used full-scale airplanes Stan grinds finished sheets 00115 thick ness FiD models 0010 Indoor Stick rhis technique also corrects balsa sheets un ven thickness salvaging otherwise un istisfactory quality Jnusual Federation ROG Joe Krush man see about flying Philadelphia area ovel Federation ROG model shows hasnt st pioneering spirit see photo tion/Murphy tontinued page 75 ramework model Litespan weighs about z per sq ft com ared heavier films such opaque white onoKote 25 oz silver 20 oz heet has shiny side rather satiny side ihich provides additional choice surface heens Usage suggested both rubber- low-powered models Other claims irtight waterproof resistant glow diesel iels can doped painted comes eets measure 20 x 36 sell 350 per sheet Balsaloc $350 per 110-gram Lr need include shipping charge $3 tr order Idealair 21 Simcoe Road 10 Al ston Ontario LOM LAO Canada Well figures stuff mentioned previous paragraph came poop sheet arrived some samples products course sounded good try own hand applying Earl Poynter Fort Worth TX previously sent number sheets Litespan ventured use yet failed send canned pep talk bolster enthusiasm Any way better late never some wing-flex problems last year using plastic films some weakly stressed Nos talgia Gas designs replaced old film cov ering standard tissue- silkspan-and-dope coverings past fall winter come conclusion films great con struction methods frameworks themselves rigid enough permit use lesstaut plastic coverings reverted tradi tional covering procedures better skin-stress properties some problem models Since just completed building Pee Wee 30 model rather rigid semigeodetic wing stab construction felt would serve guinea pig evaluating Litespan selected semitransparent yellow color application wing since already completed covering stab yellow silkspan weight used Rubber models already applied suffi cient dope Basically found Litespan easy apply quite oblivious high heat case some films material did shrink great deal wrinkles loose ar eas pretty well stretched out heat-sealing perimeter panel framework wing tried both Balsaloc well thinned white glue found little difference adhe sive properties either Also could reheat June 1990 175 Computers Systems Manager Requirements o Excellent communication skills Management Experience Knowledge Prime 2550 DEC PDP 11/73 PC Lan o Familiar Primos Infobasic Seek Novell Dbase RSTS Word 11 RTFILE AMA looking professional manager ex perienced programming databases join staff will manage direct improve enhance technical support activities well develop long-range plans future growth qualified per son preferred however would consider results-oriented person would grow us Candidates should send detailed resume cover letter salary requirements Personnel Manager Academy Model Aeronautics 1810 Samuel Morse Drive Reston Virginia 22090 Principals Only Equal Opportunity Employer JL Made America American Technology RJL Manufactures USA RJL RIC & U/C ENGINES 15 thru 61 Forster Glow & Ignition Engines FACTORY PARTS & SERVICE FOR HB Engines Cox Conquest 15 Kraft 61 Taipan 40 HGK Engines Testor/McCoy Series 21 Forster Remco Viking twin Cafl urte free information RJL industries PO Box 5 Sierra Ma&e CA 91025 818 359-0016 G Modelers amoice - High Quality enient Size Modest Price Jr Kwik Set Epoxy 5 oz $695 Gas Model Products 3773 Russet Dr Cincinnati OH 45239 dealer call 513-385-7398 order direct add $250 postage
Edition: Model Aviation - 1990/06
Page Numbers: 73, 174, 175
AND IN THE center ring Well isnt threering circus Its fun reprise events 1988 1990 edition Johnson City Indoor competition includes 1990 Indoor World Championships June 4-6 1990 NFFS US Indoor Champs June 7-9 Theres morerunning concurrently USIC 1990 AMA Indoor Nats NFFS crew has solid track record under unequaled leadership Tony Italiano havent made plans go get Send business-sized SASE Tony Ital iano entry forms address 1655 Revere Dr Brookfield WI 53005 Flying opportunities following currently known contest dates California San Diego Monthly sessions Cat Howard Haupt 3860 Eco chee Ave San Diego CA 92117 Florida Miami Dr John Martin 2180 Ti gertail Ave Miami FL 33133 phone 1-305/858-6363 MIAMA Meet #6 May 12-13 1990 MacDill AFB Tampa Kansas Topeka TOPMAC Indoor Meet May 13 1990Club Record Trials Mini Contest Contact Jack Koehlar 3425 SW Arrow head Rd Topeka KS 666143845 phone 1-913/272-8439 Pennyplane rubber control Pennyplanes gen eral Novice Pennyplanes particular have problem rubber knots jamming fail ing unwind Under very high torque motor tends creep up hook regardless hooks design problem greatest Nov ice PP since limited prop diameter requires very long rubber loops Full Pennyplane props approach 20 in diameter require rela tively higher rubber cross section same rubber weight therefore loops shorter have less tendency bunch creep Classic rubber theory indicates maximum theoretical duration rubber-powered model will occur rubber weight twice air frame weight practical standpoint ra tio 131 easier handle yields about 95% maximum theoretical duration try accommodate 39 grams rubber very short Pennyplane fuselage will definitely problems Anticreep antibunch techniques two successful suggestions Ive received vertical hooks rubber-tubing sleeves photos rear hook modified prevent jamming Don Lindley suggested making hook vertical bar shown locating 0-ring halfway up bar knot bunching rear usually completely eliminated same photo small horizontal barrier shown re duced didnt eliminate rubber bunching Another photo shows close-up experi mental front hook Its very narrow se vere reverse twist end doesnt seem pos sible rubber creep hook creeps far enough can jam against fu selage Before ask horizontal bar photo pin used make prop hold still Another photos shows best solution far short length surgical tubing slipped over both hook end rubber visible under sleeve plastic 0-ring has squeezed oval shape fit inside tubing Handling rubber sleeve Wait until mo tor has made up weighed lubed before installing rubber sleeve eas ily done using long narrow hook grabs 0-ring tubing can pulled over motor During winding sleeve will loose enough move around motor Before un hooking motor winder torquemeter slide sleeve forward enough cover half 0-ring Handle prop end motor carefully hook upit very easy make sleeve slide forward enough completely cover 0-ring happens get help un wind motor Once motor model slide sleeve forward slightly shown photo Pennyplane evolution first Indoor model built several years Novice Pennyplane shown its box page 62 October 1988 issue MA model built ex cuse go 1988 USIC incorporated several experimental design features Jim Clem have worked closely together over years thoroughly tested number ideas worked Out Jims model nearly identical innovations has placed top five three USIC meets has set Category II records Trials tribulations 1988 best could new Novice PP about nine minuteswell below 12-plus minutes needed get top five done lucky flight using piece decent rubber proper size range lucky because loop really needed about inch longer flight rubber didnt bunch up rear hook Continued fly ing Category sites ceiling height less 26 ft 3 shed no lightthe low ceiling perform ance good could expect worry ing about bunching problem told myself Better rubber answer Tan rubber will save day No guess Continued testing 1989 USIC underlined absolute importance eliminating rubber bunching rebuilt nose section modified rear hook now possible use what ever rubber size wanted fully loaded bunching results measur ably better June 1990 73 Free Flight Indoor Bud Tenny Box 545 Richardson TX 75090 Jack McGiilivray went out save pre cious balsa wood nice Easy B design TOWN eliminate bunched Knots once re place standard hook vertical post Continued page 174 Federation ROG held pioneer model avia tor Joe Krush 1989 USIC Valise photo severe reverse twist combined very small hook help reduce rubber creep Small surgical rubber tubing prevents rub ber creep jammed knots front end Four Great Days Oshkosh WI Wlttman Field Over 30 Manufacturers & Dealers Indoors hOME OF TIlE ERA T TIE EAR MUSEUM WUrrMAH puELD KOS ALLY OF GIANTS jggO AIIOCIOU@fl inc Complete Information write CUflCH Bluffs IA 51W3 IiVIAAS 10th ANNIVERSARY FUI4FLY JunO 28-29-30 July 11990 IMAA Sanctioned 107 Wildwood Dr Versailles KY 40383 tel 1606/873-7554 Desert Union Sailplane Thermalists Palm Springs CA DUST rejuvenated club back publishing its Dust Devil newsletter has joined southern California Soaring clubs competition circuit David Hall news letter editor can contacted 3030 Cypress Rd Palm Springs CA 92262 tel 1-619/ 320-58 14 Seattle Area Soaring Society recently re formed club up 50 members going strong Waid Reynolds editor SASS Up draft newsletter can reached 12448 83rd Ave So Seattle WA 98178 tel 1-206/772029 1 SWIFT club Omaha NE area new club organized February has no dues started things off right foot coming AMA chartered club #2749 Its Vis ible Lift newsletter edited Ron Ponec can reached via PO Box 174 Elkhorn NE 68022 always appreciate receiving club newsletters since best way keeping touch whats happening Soaring around country Editors please send home address listed top column Model Aviation editorial offices FF Indoor/Tenny Continued page 73 So what wrong learned good tan rubber seemed to wind ef fectively model still required immensely larger amount power Jims very similar model no clue exact reason High drag After USIC carefully examined model thiniring terms what would ab sorb energy during power burst model trimmed wing very far forward leaving small angular difference between wing stab incidence However repairs early tail boom damage left some positive cidence relative motor stick centerline wing also positive incidence addition model behaved fin area too small pronounced Dutch roll during sev eral phases flight Normal trim accommo date high torque included some left thrust no downthrust significant amount wing offset several degrees washin/washout twist Operation streamline new tail boom fin built fin area concen trated farther aft socket plug-in boom removed reinstalled give slight negative stab incidence allowing wing incidence reduced zero relative stick centerline Virtually washin/washout twist between tip dihedral breaks re moved small equal amount washout put tip prevent possibility tip stall model now climbed cleanly low ceil ings lower torque cruised nose-up titude very slightly lower cruise torque Ready Nats quite Idahos Kibbie Dome could get model higher expense too much rubber climb very clean smooth almost no Dutch roll fact very long heavy loop made scrub big acoustical tiles ceiling lucky get Uiii~ 1/4-SCALE PLANS FROM FACTORY BLUEPRINTS See Scale RIO Modeler October 88 Wing Loading 18 ozs Span 78 inches Weight 825 lbs Area 1053 inches 46-61 2/Cycle Plans rolled manual Spaceman decals $3000 PPD Cowls pants Fiberglass Master Dry Ridge Models 59 McCurry Road704 658-2663 Weaverville NC 28787 back could have lost top tile way out reach dead-sticked prop locked glided 135 total just over eight min utes Now good idea what power use got flight just over 10 minutes ran out time contest ended power going Texas high ceiling 1000 miles away few minutes high-ceiling flying time left 1989 Next chance Johnson City 1990 two possible culprits thick airfoil section center wing props Jim Clem loaned props weighed same Several quick test flights motors documented per formance props showed no major differ ences using Jims prop has wing Tune later see new wing solves problem Balsa expensive Canada least thats reason Jack McGillivray gives Easy B has three wing ribs no stab ribs see photo Chilton building techniques know Stan Chilton aware high level crafts manship models have Behind craftsman ship some unusual improved building practices Motor stick hints motor stick Indoor Rubber models heavier crit ical components After choosing balsa sheet straight uniform grain correct den sity Stan cuts blank wider needed instead using exact width match diameter form bevels edge sheet before soaking water 1/4 Scale Kits $12995 Epoxy/Glass/Foam Construction Drawings Data Formula 120 Pylon Sport Standoff ScaleKit Price ping Credit Cards WelcomedOhio Residents Add 7% 174 Model Aviation CAPACITIVE-DISCHARGE IGNITION featuring IBO1lALLX QInlIHLLEfl EABl ADVANCEIII No moving parts No engine modifications Basic unit $ 9995 Opposedcylinder twin $ 11995 Fald BCoiaWadShoe lee After soaking sheet Stan wraps sheet form beveled edge inside using rubber-model silkapan instead tissue al lows edges wider blank overlap form After baking assembly kit chen oven cuts through tissue over lap using straightedge guide resulting edges glue seam fit perfectly requir ing less glue good joint Before making joint preglues sur faces mated using very thin glue applied artists brush resulting joint al invisible lightest possible make Another important practice use shrinkable Teflon tubing available electronics sup pliers motor-stick form glued motor tube wont stick form during sembly Before removing tube form Stan adds spiral wrap boron fiber under ten sion improve torsional strength boron attached using nitrocellulose cement Using boron novice Extreme care must used cutting preventing minute broken particles escaping work surface Bill Warner some penetrating observations substance Indoor Scale columns couple years ago RMcM Prop trim Stans props checked bal ance pitch angle tracking assure wobblefree operation Initially individual pieces matched weight strength helps en sure static balance finished prop Pre cisely checking blade angle major antiwobble factor Stan checks tracking sure both blades same plane As re sult Stans props exceptionally smooth run ning Surface grinding US Indoor wood sup pliers compete strongly creating smoothly cut balsa sheets uniform thickness However perfect sheet still has surfaces raw wood Stan Chilton uses surface grinder smooth both sides balsa sheet making slightly thinner balsa lighter stiffer stronger after treatment mechanism under stood has postulated lignin wood has melted thin sheet web strengthens wood much like compos ite structures used full-scale airplanes Stan grinds finished sheets 00115 thick ness FiD models 0010 Indoor Stick rhis technique also corrects balsa sheets un ven thickness salvaging otherwise un istisfactory quality Jnusual Federation ROG Joe Krush man see about flying Philadelphia area ovel Federation ROG model shows hasnt st pioneering spirit see photo tion/Murphy tontinued page 75 ramework model Litespan weighs about z per sq ft com ared heavier films such opaque white onoKote 25 oz silver 20 oz heet has shiny side rather satiny side ihich provides additional choice surface heens Usage suggested both rubber- low-powered models Other claims irtight waterproof resistant glow diesel iels can doped painted comes eets measure 20 x 36 sell 350 per sheet Balsaloc $350 per 110-gram Lr need include shipping charge $3 tr order Idealair 21 Simcoe Road 10 Al ston Ontario LOM LAO Canada Well figures stuff mentioned previous paragraph came poop sheet arrived some samples products course sounded good try own hand applying Earl Poynter Fort Worth TX previously sent number sheets Litespan ventured use yet failed send canned pep talk bolster enthusiasm Any way better late never some wing-flex problems last year using plastic films some weakly stressed Nos talgia Gas designs replaced old film cov ering standard tissue- silkspan-and-dope coverings past fall winter come conclusion films great con struction methods frameworks themselves rigid enough permit use lesstaut plastic coverings reverted tradi tional covering procedures better skin-stress properties some problem models Since just completed building Pee Wee 30 model rather rigid semigeodetic wing stab construction felt would serve guinea pig evaluating Litespan selected semitransparent yellow color application wing since already completed covering stab yellow silkspan weight used Rubber models already applied suffi cient dope Basically found Litespan easy apply quite oblivious high heat case some films material did shrink great deal wrinkles loose ar eas pretty well stretched out heat-sealing perimeter panel framework wing tried both Balsaloc well thinned white glue found little difference adhe sive properties either Also could reheat June 1990 175 Computers Systems Manager Requirements o Excellent communication skills Management Experience Knowledge Prime 2550 DEC PDP 11/73 PC Lan o Familiar Primos Infobasic Seek Novell Dbase RSTS Word 11 RTFILE AMA looking professional manager ex perienced programming databases join staff will manage direct improve enhance technical support activities well develop long-range plans future growth qualified per son preferred however would consider results-oriented person would grow us Candidates should send detailed resume cover letter salary requirements Personnel Manager Academy Model Aeronautics 1810 Samuel Morse Drive Reston Virginia 22090 Principals Only Equal Opportunity Employer JL Made America American Technology RJL Manufactures USA RJL RIC & U/C ENGINES 15 thru 61 Forster Glow & Ignition Engines FACTORY PARTS & SERVICE FOR HB Engines Cox Conquest 15 Kraft 61 Taipan 40 HGK Engines Testor/McCoy Series 21 Forster Remco Viking twin Cafl urte free information RJL industries PO Box 5 Sierra Ma&e CA 91025 818 359-0016 G Modelers amoice - High Quality enient Size Modest Price Jr Kwik Set Epoxy 5 oz $695 Gas Model Products 3773 Russet Dr Cincinnati OH 45239 dealer call 513-385-7398 order direct add $250 postage