TOP CAT 200 rather special model other designs have performed quite well over years topping Nats Indoor Rubber Events least once setting some three dozen National Records However have equaled performance accomplishments Top Cat 200 first design crack 40 mm important personal indoor milestone Secondly its booming record flight makes Top Cat 200 number high flier history US Indoor basic 200 sq design flew well start logging four flights over 35 mm during first test session Although certainly encouraging over year additional development required variations props stabs wing sections built flight tested Oddly enough constants stick boom wing planform special batch rubber last item warrants clarification Six years ago stripped batch 055 Pirelli tested out poorly coded 55M mediocre set aside Years later batch evidently aged properly found outstanding could take normal turns power output about 065 rubber Unfortunately batch rubber has expended since fly frequently break motors Friends claim wind motors until break back off turn about half true record flight actually sixth time design cracked 40 minutes Flying conditions inside Santa Anas giant 156ft-high balloon hangar ideal cool jacket weather Most impor tant however drift very low Packing 2240 winds its 20-in motor Cat slowly climbed top 10 mm touched grazed beams about dozen times last time 16-mm mark remaining perfectly centered must admit critical times such beam bouncing talk ships making re quests like Dont hang up please stop climbing etc Laugh wish time ships respond 35 mm clocked prop speed 39 rpm almost convinced myself indicated would run out winds 5 6 mm However 8 mm later ship still 10 ft high passed through Ernie Kopeckys old record 4342 Top Cat finally landed just short 45 minutes ideal Ard row knots remaining TOP QIT outstanding Indoor Stick holds Open Category Ill record remarkable time 44502 LE 6 C ffi O CBNRCES CO PSESSIGO RIBS CENTER SPARS ORE TIPS OSNIOZ4W0Z4OlB RIBS 0000 015 OSOoOIBO2S0OIB OAB 50400056 IS/BA PROP OONAURALOIAWIRE 4 ZOR70020SG 000000 00OUABZ RING POSTS FRONT 41-tI-A BACK SCCA 1~ CSRLDTISSI-E TUBE 0141-IT SICK OR MOOEL NOUCER RAZOR BAROOSIdt RING GLC 000 BULOOBAG040055 WRAPPED WING MOUNT DETAILS DOUBLE SIZE 040000 WRAPPED COD GLI-ED 000J117 010 WIRE MICROLITE WRAP STICK 0145 OPOOM BOOM COB 4k STICK BRACING 001 TIINGSTBN OTHER COOKS NICOROME 0~~ _ TOP CAT 200 NOB RAIIOOLOl AC MAY 1073 N IK 007 ORG4OROC0 S 7 ILBET 50 Model Aviation LAS 0% 00 84041 SCI-ICOCO ROTORS RE WGV0OZ 571CC0140 0000 Q4 TOTAL 0004 ONCOAC 04 000 POWER 00050 RCOOTIJRON COO ORM RZ4 717% CO Construction wood sizes cited actually used record ship Few modelers will able should try build light stronger structure should con sidered As rough guide indoor novice should increase spar rib sizes about 50% will result model easily capable over 30 minutes will find corner hobby shop probably doesnt carry indoor supplies Most indoor wood supplies Micro-X 5200 Seven Pines Dr Lorain OH 053 continue make own indoor cement thinning out Ambroid acetone secret making light models build lot keep accu rate records piece wood used Set weight goals keeping mind indoor-model component doesnt fail structurally flight may too heavy Good direct reading scales great help can built very little cost have handles up 025 oz 004 oz max Microfilm Your first project should make film can age 1-4 weeks build other model compo nents Make half dozen covering frames 8 X 38 -in sq balsa Also make tank frame 2 X 4 ft nailing 2 X 2 wood boards together set top one-half ping-pong table garage cover plastic sheeting Above For Bob Top Cat all-out effort pass 40 mmhed already topped Nats Indoor event least once has set some three dozen national records Right prop blade outlines bent around cardboard tem plate tack-glued 32-in-pitch block Below Relaxed Bob times test hop record flight used 2240 turns 20-in motor recommends novice increase spar rib sizes 50%model still easily does 30 mm available dime stores Fill clean use distilled water between ep let set overnight stabil ize water temperature Fill spray bot tle water used later wet down covering frames As insurance good results purchase small tube Dow Corning Silicone Adhesive now ready make film Put small amount Silicone end finger pat two top surface 8 X 38 frames correct amount slight cant seen seems tacky appli cation finger Pour Micro-X Red Label Solution teaspoon move tank center about e water surface Slowly pour steady flow avoiding last minute droplets using fingers stop flow move spoon away quickly Start stop watch mm prepared frame can wetted surfaces water spray placed gently top elliptical-shaped floating film After mm has elapsed slowly float frame within sides tank gather excess ifim Using fingers care fully lift excess film 4-in intervals over top covering frame Try avoid getting water droplets film center covering frame can removed easily touching corners dry handkerchief five mm have moment truthlift-off Float covered frame far wide side tank gives room pull off towards Hold opposite ends leading edge index fingers frame can pivot pull smoothly towards up may wish try blowing under frame start lift frame will pivot end up vertical trailing edge last leave water surface continued page 86 October1976 51 Quickly set down floor near vertical position done once vibrations hands will shatter film very weak strain lift 10 mm excess water will have run off film will tough enough moved out way aging Dont try pour microfilm rainy day seldom works due humidity Stick Boom Tapered metal rods rolling tail booms standard items sup plied several major indoor model sup pliers got Micro-X Its listed catalog Universal Steel Boom Form guess could machine lathe 15 long taper Some ones Microdyne used sell surplus aircraft antennas Cut motor stick blank light C grained stock fit around A-in tubing Use hypodermic needle glue seam rear hook design allows fully wound motor easily removed dont under stand indoor builders dont use type end 012-wire hook should honed round keep cutting motors Same prop shaft After rear hook glued gusset wrap 8-10 times dacron monofilament re glue nose structure shown fully plan slot cut using 012 razor saw actually makes about 018 slot After dual thrust bearing glued stick bind dacron reglue motorstick braces go way through stick strength cut off bottom glued Apply tungsten wire tight enough bow stick about 1/16 boom blank cut rolled tapered metal form tail boom fits side stick glued zero stab incidence after installation stab rudder bracing Wing Stab Rudder curved out lines formed around cardboard tem plates Build up wing stab com pression ribs next Note front wing ribs cut diagonal leading edge spar diamond shaped Re member glue wing tips very light ly make easier put dihedral after covering cover wings stabs using modified Bilgri procedure Lay struc ture fiat pressboard Using brush water wet around outline about 1/4 lower slack film frame pressboard blowing down gently Ribs wet stuck film until after outline trimmed Next put re quired tip dihedral glue find bracing jigs unnecessary Make training edge straight gluing rear post cabane rear tip posts wing flat building board Next rear second ary rear primary bracing wire 00045 installed size wire may difficult see very easy tension properly main wing posts spare stick sockets glue front post front tip posts wire sec ondary primary bracing eye ball Bracing wing tips flat true com pletes wing use small microlite piece protect stab microfilm post goes through hole made using hot needle stab braced fiat true Install rudder end boom have /s left turn brace Propeller An efficient prop necessary achieve high flight times First carve 32-in pitch prop block Form prop outlines around cardboard prop blade template dry mark leading edge center prop tip felt pen before removing Glue hub end outline together form continuous fiat outline Next make tapered spar install hook Tack glue outline block starting tip after spar block straight After spar ribs glued moisten prop outline water shape better blade dry cut carefully block build other blade Covering props microfilm easy fun right trick see wet both sides outline ribs keeping spar dry Lay prop film tip flat trim progressively toward hub using acetone Too much acetone will jump outline too little will cause brush bristles dry stick film ripping film isnt stuck some prop ribs blow ribs still wet Flight Test Use initial motor 18 060 rubber locate movable wing post holders obtain correct CG Stability rearward balance point excellent Put about 35 turns using 16-I winder low cruise incidence ad justing test flight opinion common tendency fly less optimum wing incidence Keep increas ing incidence until definite stall ob tained reduce just enough avoid stall doing check circle size rudder can adjusted obtain 30-ft diameter Launch model waist high preliminary incidence tests never let climb higher can reach can keep adjusting re launching satisfied work up full turns very slowly model finally climbs close top use winds remaining guide selecting optimum rubber motor Full winds cannot used backing some turns off flying Category 1 2 sites will find unless pushing record flights therefore must get altitude possible site indoor models will last years provide many hours flight time 86 Model Aviation Top Cat/Randolph continued oaqe 51 Langleys Model Aero Engine 1903 Robert Meyer Curator National Air & Space Museum Smithsonian Institution Illustrated orical Collectors Item $500 Cumberland Press 4926 Del Ray Avenue Bethesda Maryland 20014 An Ace Mount Ace
Edition: Model Aviation - 1976/10
Page Numbers: 50, 51, 86
TOP CAT 200 rather special model other designs have performed quite well over years topping Nats Indoor Rubber Events least once setting some three dozen National Records However have equaled performance accomplishments Top Cat 200 first design crack 40 mm important personal indoor milestone Secondly its booming record flight makes Top Cat 200 number high flier history US Indoor basic 200 sq design flew well start logging four flights over 35 mm during first test session Although certainly encouraging over year additional development required variations props stabs wing sections built flight tested Oddly enough constants stick boom wing planform special batch rubber last item warrants clarification Six years ago stripped batch 055 Pirelli tested out poorly coded 55M mediocre set aside Years later batch evidently aged properly found outstanding could take normal turns power output about 065 rubber Unfortunately batch rubber has expended since fly frequently break motors Friends claim wind motors until break back off turn about half true record flight actually sixth time design cracked 40 minutes Flying conditions inside Santa Anas giant 156ft-high balloon hangar ideal cool jacket weather Most impor tant however drift very low Packing 2240 winds its 20-in motor Cat slowly climbed top 10 mm touched grazed beams about dozen times last time 16-mm mark remaining perfectly centered must admit critical times such beam bouncing talk ships making re quests like Dont hang up please stop climbing etc Laugh wish time ships respond 35 mm clocked prop speed 39 rpm almost convinced myself indicated would run out winds 5 6 mm However 8 mm later ship still 10 ft high passed through Ernie Kopeckys old record 4342 Top Cat finally landed just short 45 minutes ideal Ard row knots remaining TOP QIT outstanding Indoor Stick holds Open Category Ill record remarkable time 44502 LE 6 C ffi O CBNRCES CO PSESSIGO RIBS CENTER SPARS ORE TIPS OSNIOZ4W0Z4OlB RIBS 0000 015 OSOoOIBO2S0OIB OAB 50400056 IS/BA PROP OONAURALOIAWIRE 4 ZOR70020SG 000000 00OUABZ RING POSTS FRONT 41-tI-A BACK SCCA 1~ CSRLDTISSI-E TUBE 0141-IT SICK OR MOOEL NOUCER RAZOR BAROOSIdt RING GLC 000 BULOOBAG040055 WRAPPED WING MOUNT DETAILS DOUBLE SIZE 040000 WRAPPED COD GLI-ED 000J117 010 WIRE MICROLITE WRAP STICK 0145 OPOOM BOOM COB 4k STICK BRACING 001 TIINGSTBN OTHER COOKS NICOROME 0~~ _ TOP CAT 200 NOB RAIIOOLOl AC MAY 1073 N IK 007 ORG4OROC0 S 7 ILBET 50 Model Aviation LAS 0% 00 84041 SCI-ICOCO ROTORS RE WGV0OZ 571CC0140 0000 Q4 TOTAL 0004 ONCOAC 04 000 POWER 00050 RCOOTIJRON COO ORM RZ4 717% CO Construction wood sizes cited actually used record ship Few modelers will able should try build light stronger structure should con sidered As rough guide indoor novice should increase spar rib sizes about 50% will result model easily capable over 30 minutes will find corner hobby shop probably doesnt carry indoor supplies Most indoor wood supplies Micro-X 5200 Seven Pines Dr Lorain OH 053 continue make own indoor cement thinning out Ambroid acetone secret making light models build lot keep accu rate records piece wood used Set weight goals keeping mind indoor-model component doesnt fail structurally flight may too heavy Good direct reading scales great help can built very little cost have handles up 025 oz 004 oz max Microfilm Your first project should make film can age 1-4 weeks build other model compo nents Make half dozen covering frames 8 X 38 -in sq balsa Also make tank frame 2 X 4 ft nailing 2 X 2 wood boards together set top one-half ping-pong table garage cover plastic sheeting Above For Bob Top Cat all-out effort pass 40 mmhed already topped Nats Indoor event least once has set some three dozen national records Right prop blade outlines bent around cardboard tem plate tack-glued 32-in-pitch block Below Relaxed Bob times test hop record flight used 2240 turns 20-in motor recommends novice increase spar rib sizes 50%model still easily does 30 mm available dime stores Fill clean use distilled water between ep let set overnight stabil ize water temperature Fill spray bot tle water used later wet down covering frames As insurance good results purchase small tube Dow Corning Silicone Adhesive now ready make film Put small amount Silicone end finger pat two top surface 8 X 38 frames correct amount slight cant seen seems tacky appli cation finger Pour Micro-X Red Label Solution teaspoon move tank center about e water surface Slowly pour steady flow avoiding last minute droplets using fingers stop flow move spoon away quickly Start stop watch mm prepared frame can wetted surfaces water spray placed gently top elliptical-shaped floating film After mm has elapsed slowly float frame within sides tank gather excess ifim Using fingers care fully lift excess film 4-in intervals over top covering frame Try avoid getting water droplets film center covering frame can removed easily touching corners dry handkerchief five mm have moment truthlift-off Float covered frame far wide side tank gives room pull off towards Hold opposite ends leading edge index fingers frame can pivot pull smoothly towards up may wish try blowing under frame start lift frame will pivot end up vertical trailing edge last leave water surface continued page 86 October1976 51 Quickly set down floor near vertical position done once vibrations hands will shatter film very weak strain lift 10 mm excess water will have run off film will tough enough moved out way aging Dont try pour microfilm rainy day seldom works due humidity Stick Boom Tapered metal rods rolling tail booms standard items sup plied several major indoor model sup pliers got Micro-X Its listed catalog Universal Steel Boom Form guess could machine lathe 15 long taper Some ones Microdyne used sell surplus aircraft antennas Cut motor stick blank light C grained stock fit around A-in tubing Use hypodermic needle glue seam rear hook design allows fully wound motor easily removed dont under stand indoor builders dont use type end 012-wire hook should honed round keep cutting motors Same prop shaft After rear hook glued gusset wrap 8-10 times dacron monofilament re glue nose structure shown fully plan slot cut using 012 razor saw actually makes about 018 slot After dual thrust bearing glued stick bind dacron reglue motorstick braces go way through stick strength cut off bottom glued Apply tungsten wire tight enough bow stick about 1/16 boom blank cut rolled tapered metal form tail boom fits side stick glued zero stab incidence after installation stab rudder bracing Wing Stab Rudder curved out lines formed around cardboard tem plates Build up wing stab com pression ribs next Note front wing ribs cut diagonal leading edge spar diamond shaped Re member glue wing tips very light ly make easier put dihedral after covering cover wings stabs using modified Bilgri procedure Lay struc ture fiat pressboard Using brush water wet around outline about 1/4 lower slack film frame pressboard blowing down gently Ribs wet stuck film until after outline trimmed Next put re quired tip dihedral glue find bracing jigs unnecessary Make training edge straight gluing rear post cabane rear tip posts wing flat building board Next rear second ary rear primary bracing wire 00045 installed size wire may difficult see very easy tension properly main wing posts spare stick sockets glue front post front tip posts wire sec ondary primary bracing eye ball Bracing wing tips flat true com pletes wing use small microlite piece protect stab microfilm post goes through hole made using hot needle stab braced fiat true Install rudder end boom have /s left turn brace Propeller An efficient prop necessary achieve high flight times First carve 32-in pitch prop block Form prop outlines around cardboard prop blade template dry mark leading edge center prop tip felt pen before removing Glue hub end outline together form continuous fiat outline Next make tapered spar install hook Tack glue outline block starting tip after spar block straight After spar ribs glued moisten prop outline water shape better blade dry cut carefully block build other blade Covering props microfilm easy fun right trick see wet both sides outline ribs keeping spar dry Lay prop film tip flat trim progressively toward hub using acetone Too much acetone will jump outline too little will cause brush bristles dry stick film ripping film isnt stuck some prop ribs blow ribs still wet Flight Test Use initial motor 18 060 rubber locate movable wing post holders obtain correct CG Stability rearward balance point excellent Put about 35 turns using 16-I winder low cruise incidence ad justing test flight opinion common tendency fly less optimum wing incidence Keep increas ing incidence until definite stall ob tained reduce just enough avoid stall doing check circle size rudder can adjusted obtain 30-ft diameter Launch model waist high preliminary incidence tests never let climb higher can reach can keep adjusting re launching satisfied work up full turns very slowly model finally climbs close top use winds remaining guide selecting optimum rubber motor Full winds cannot used backing some turns off flying Category 1 2 sites will find unless pushing record flights therefore must get altitude possible site indoor models will last years provide many hours flight time 86 Model Aviation Top Cat/Randolph continued oaqe 51 Langleys Model Aero Engine 1903 Robert Meyer Curator National Air & Space Museum Smithsonian Institution Illustrated orical Collectors Item $500 Cumberland Press 4926 Del Ray Avenue Bethesda Maryland 20014 An Ace Mount Ace
Edition: Model Aviation - 1976/10
Page Numbers: 50, 51, 86
TOP CAT 200 rather special model other designs have performed quite well over years topping Nats Indoor Rubber Events least once setting some three dozen National Records However have equaled performance accomplishments Top Cat 200 first design crack 40 mm important personal indoor milestone Secondly its booming record flight makes Top Cat 200 number high flier history US Indoor basic 200 sq design flew well start logging four flights over 35 mm during first test session Although certainly encouraging over year additional development required variations props stabs wing sections built flight tested Oddly enough constants stick boom wing planform special batch rubber last item warrants clarification Six years ago stripped batch 055 Pirelli tested out poorly coded 55M mediocre set aside Years later batch evidently aged properly found outstanding could take normal turns power output about 065 rubber Unfortunately batch rubber has expended since fly frequently break motors Friends claim wind motors until break back off turn about half true record flight actually sixth time design cracked 40 minutes Flying conditions inside Santa Anas giant 156ft-high balloon hangar ideal cool jacket weather Most impor tant however drift very low Packing 2240 winds its 20-in motor Cat slowly climbed top 10 mm touched grazed beams about dozen times last time 16-mm mark remaining perfectly centered must admit critical times such beam bouncing talk ships making re quests like Dont hang up please stop climbing etc Laugh wish time ships respond 35 mm clocked prop speed 39 rpm almost convinced myself indicated would run out winds 5 6 mm However 8 mm later ship still 10 ft high passed through Ernie Kopeckys old record 4342 Top Cat finally landed just short 45 minutes ideal Ard row knots remaining TOP QIT outstanding Indoor Stick holds Open Category Ill record remarkable time 44502 LE 6 C ffi O CBNRCES CO PSESSIGO RIBS CENTER SPARS ORE TIPS OSNIOZ4W0Z4OlB RIBS 0000 015 OSOoOIBO2S0OIB OAB 50400056 IS/BA PROP OONAURALOIAWIRE 4 ZOR70020SG 000000 00OUABZ RING POSTS FRONT 41-tI-A BACK SCCA 1~ CSRLDTISSI-E TUBE 0141-IT SICK OR MOOEL NOUCER RAZOR BAROOSIdt RING GLC 000 BULOOBAG040055 WRAPPED WING MOUNT DETAILS DOUBLE SIZE 040000 WRAPPED COD GLI-ED 000J117 010 WIRE MICROLITE WRAP STICK 0145 OPOOM BOOM COB 4k STICK BRACING 001 TIINGSTBN OTHER COOKS NICOROME 0~~ _ TOP CAT 200 NOB RAIIOOLOl AC MAY 1073 N IK 007 ORG4OROC0 S 7 ILBET 50 Model Aviation LAS 0% 00 84041 SCI-ICOCO ROTORS RE WGV0OZ 571CC0140 0000 Q4 TOTAL 0004 ONCOAC 04 000 POWER 00050 RCOOTIJRON COO ORM RZ4 717% CO Construction wood sizes cited actually used record ship Few modelers will able should try build light stronger structure should con sidered As rough guide indoor novice should increase spar rib sizes about 50% will result model easily capable over 30 minutes will find corner hobby shop probably doesnt carry indoor supplies Most indoor wood supplies Micro-X 5200 Seven Pines Dr Lorain OH 053 continue make own indoor cement thinning out Ambroid acetone secret making light models build lot keep accu rate records piece wood used Set weight goals keeping mind indoor-model component doesnt fail structurally flight may too heavy Good direct reading scales great help can built very little cost have handles up 025 oz 004 oz max Microfilm Your first project should make film can age 1-4 weeks build other model compo nents Make half dozen covering frames 8 X 38 -in sq balsa Also make tank frame 2 X 4 ft nailing 2 X 2 wood boards together set top one-half ping-pong table garage cover plastic sheeting Above For Bob Top Cat all-out effort pass 40 mmhed already topped Nats Indoor event least once has set some three dozen national records Right prop blade outlines bent around cardboard tem plate tack-glued 32-in-pitch block Below Relaxed Bob times test hop record flight used 2240 turns 20-in motor recommends novice increase spar rib sizes 50%model still easily does 30 mm available dime stores Fill clean use distilled water between ep let set overnight stabil ize water temperature Fill spray bot tle water used later wet down covering frames As insurance good results purchase small tube Dow Corning Silicone Adhesive now ready make film Put small amount Silicone end finger pat two top surface 8 X 38 frames correct amount slight cant seen seems tacky appli cation finger Pour Micro-X Red Label Solution teaspoon move tank center about e water surface Slowly pour steady flow avoiding last minute droplets using fingers stop flow move spoon away quickly Start stop watch mm prepared frame can wetted surfaces water spray placed gently top elliptical-shaped floating film After mm has elapsed slowly float frame within sides tank gather excess ifim Using fingers care fully lift excess film 4-in intervals over top covering frame Try avoid getting water droplets film center covering frame can removed easily touching corners dry handkerchief five mm have moment truthlift-off Float covered frame far wide side tank gives room pull off towards Hold opposite ends leading edge index fingers frame can pivot pull smoothly towards up may wish try blowing under frame start lift frame will pivot end up vertical trailing edge last leave water surface continued page 86 October1976 51 Quickly set down floor near vertical position done once vibrations hands will shatter film very weak strain lift 10 mm excess water will have run off film will tough enough moved out way aging Dont try pour microfilm rainy day seldom works due humidity Stick Boom Tapered metal rods rolling tail booms standard items sup plied several major indoor model sup pliers got Micro-X Its listed catalog Universal Steel Boom Form guess could machine lathe 15 long taper Some ones Microdyne used sell surplus aircraft antennas Cut motor stick blank light C grained stock fit around A-in tubing Use hypodermic needle glue seam rear hook design allows fully wound motor easily removed dont under stand indoor builders dont use type end 012-wire hook should honed round keep cutting motors Same prop shaft After rear hook glued gusset wrap 8-10 times dacron monofilament re glue nose structure shown fully plan slot cut using 012 razor saw actually makes about 018 slot After dual thrust bearing glued stick bind dacron reglue motorstick braces go way through stick strength cut off bottom glued Apply tungsten wire tight enough bow stick about 1/16 boom blank cut rolled tapered metal form tail boom fits side stick glued zero stab incidence after installation stab rudder bracing Wing Stab Rudder curved out lines formed around cardboard tem plates Build up wing stab com pression ribs next Note front wing ribs cut diagonal leading edge spar diamond shaped Re member glue wing tips very light ly make easier put dihedral after covering cover wings stabs using modified Bilgri procedure Lay struc ture fiat pressboard Using brush water wet around outline about 1/4 lower slack film frame pressboard blowing down gently Ribs wet stuck film until after outline trimmed Next put re quired tip dihedral glue find bracing jigs unnecessary Make training edge straight gluing rear post cabane rear tip posts wing flat building board Next rear second ary rear primary bracing wire 00045 installed size wire may difficult see very easy tension properly main wing posts spare stick sockets glue front post front tip posts wire sec ondary primary bracing eye ball Bracing wing tips flat true com pletes wing use small microlite piece protect stab microfilm post goes through hole made using hot needle stab braced fiat true Install rudder end boom have /s left turn brace Propeller An efficient prop necessary achieve high flight times First carve 32-in pitch prop block Form prop outlines around cardboard prop blade template dry mark leading edge center prop tip felt pen before removing Glue hub end outline together form continuous fiat outline Next make tapered spar install hook Tack glue outline block starting tip after spar block straight After spar ribs glued moisten prop outline water shape better blade dry cut carefully block build other blade Covering props microfilm easy fun right trick see wet both sides outline ribs keeping spar dry Lay prop film tip flat trim progressively toward hub using acetone Too much acetone will jump outline too little will cause brush bristles dry stick film ripping film isnt stuck some prop ribs blow ribs still wet Flight Test Use initial motor 18 060 rubber locate movable wing post holders obtain correct CG Stability rearward balance point excellent Put about 35 turns using 16-I winder low cruise incidence ad justing test flight opinion common tendency fly less optimum wing incidence Keep increas ing incidence until definite stall ob tained reduce just enough avoid stall doing check circle size rudder can adjusted obtain 30-ft diameter Launch model waist high preliminary incidence tests never let climb higher can reach can keep adjusting re launching satisfied work up full turns very slowly model finally climbs close top use winds remaining guide selecting optimum rubber motor Full winds cannot used backing some turns off flying Category 1 2 sites will find unless pushing record flights therefore must get altitude possible site indoor models will last years provide many hours flight time 86 Model Aviation Top Cat/Randolph continued oaqe 51 Langleys Model Aero Engine 1903 Robert Meyer Curator National Air & Space Museum Smithsonian Institution Illustrated orical Collectors Item $500 Cumberland Press 4926 Del Ray Avenue Bethesda Maryland 20014 An Ace Mount Ace