PAMPA Categories 1979 Since contests planned early part year about stepping up local Contest Director asking PAMPA Categories summers contest proposal Ted Fancher Foster City Cal part Pampa Classification System Review Board committee report calls use three PAMPA classes plus use existing AMA Novice Pattern makes very good sense Since already have AMA Novice Pattern logical starting point beginning stunt flier Over past couple years have tried PAMPA categories have seen little use having beginners attempt full pattern appears once flier can complete full pattern will just about automatically fall Intermediate class supposed point range 300 399 Therefore contests should set up following classes Novice AMA Pattern Sportsman takes place Intermediate just better sounding narne300 399 Advanced400 499 Expert500 over event contest manager doesnt want foot bill three additional trophies local condi tions should govern categories combine ie Sportsman Advanced combined Advanced Expert com bined stunt enthusiasts particular area will stand up voice opinions probably contest management will decide put four categories Selection category flier still voluntary basis Despite work Richard Byron maintaining listing stunt fliers averages appears majority contestants just signed up category felt should particular contest appeared few abuses voluntary system Fancher report PAMPA President Trostle makes note proposed review board check over scores proposed PAMPA membership card category listing back will automatically promote flier next higher cate gory after three scores class Remember event directors guide guide setting up contest PAMPA categories still available Wynn Paul just asking Notes H-P 40 engine following ideas recommendations come Continued page 106 April 1979 39 Gary Aispaugh cant faulted lack Imagination Sherry III Twin Fox 35s turning three bladed fans twin tails make conversation piece aswell good performIng machine Its Stott foam wing spans 57 Inches all-up weight 62 oz Wynn Paul photo Tatone Peace Pipe mufflerlnstallatlon Canadian Jeff Hlggs planewith ST46 engine Jeff drilled tapped holes mount muffler engine adding ounce weight Wynn Paul photo winner Ins first day 1979 King Orange internationals Dennis Duvail won PAMPA Ex pert flying semi-scale MIG ST46 engine Built-up model spans 62 weighs 55 oz THE chose Waco F-3 biplane flagship because represents Golden Era 1930s flying adventure Add easy snag-free building safe gentle flyingthe result thorough kit engineering careful prototype development features Platt Kits have satisfying building flying experience ahead Kit featuresTop-quality diecut machined balsa plywood Full size plans Separate instruction book isometrics Decals Injection-moulded vacuum-formed plastic cowl cowl blisters wheel pants required nylon fittings Formed wire langing gear & struts Span 60 Area 950 Sq 4 6 channel Engine good 40 60 Miami Florida 33180 2657 NE 188th Street Telephone 935-1436 several parachuting crew members signal Bettys demise hands Allies Come didnt really expect him crash did heart Kens replica clever internal bomb bay release mechanism devised Five different kinds droppable stores can released bomb bay duplicating capabilities versatile full-scale Bettys basic ideas behind system give great potential use other scale subjects could easily adapted RC scale model Kens letter describes working details main wire runs parallel fuselage inboard side bomb bay Elastic bands glued epoxy opposite side bomb bay Small eyelets wrapped thread epoxied other end elastic bands bands stretched across bomb bay spur wires put through eyelets time beginning longest wire droppable stores put under elastic bands slow pull fourth line will release stores time sequence beauty using elastic bands bomb bay will facilitate different sizes shapes droppable stores will hold fast parachutes folded against dummy figures will hold until released torpedo can carried using first last bands released fast pull release line has functioned flawlessly smoke baby powder released compartment aft wheel well outboard engine nacelle one-inch square hatch bottom cloth hinged hatch door 1 square k soft rubber epoxied inside surface make seal prevent powder escaping until release pin activated air moving past open hatch engine vibration shaking powder down will expel last bit powder Ive found four ounces baby powder ooming through one-inch square opening 60-foot lines travelling reasonable close scale speed will last about two rounds course powder rounds Birds Feather coincidence weve got another twin-engined scale subject spotlight month Phillip Perez brother past contributor Jeff sent us info sport scale version Luftwaffes little-remembered Heinkle He2 19 219 two-seat long-range fighter employed 194344 intercept nightly Allied bombing raids over Ger accomplish equipped radar thus four antenna sticking out nose powerful armament no less six forward-firing cannons Phils scratch-built model has wingspan 60 powered two Testors McCoy 35 engines construction engine nacelles especially noteworthy Typically multiengined scale models difficult get things required confines engine nacelles addition engines fuel tanks often need room landing gear installation gear retractable problem compounds greatly Obviously space critical structure nacelle itself must kept absolute minimum sacrificing strength Phils nacelle construction best idea have seen yet nacelle itself made epoxyglass turn glassed wing structure plywood fire wall removable removed brings engine mount fuel tank tank held onto back firewall metal strap plywood ring mounted nacelle has blind nuts installed accommodate three firewall mounting bolts accom panying drawing photo should give general idea Safety workshop no accident Mike Gretz Box 162 Montezuma IA 50171 CL Aerobatics/Paul continued page 39 Paul Fewell Ft Mitchell Kentucky Unlike Max engines HP-40 really needs disassembled cleaned upon receipt Almost always sleeve ports have flashing residue must cleaned up Several cases metal shavings bearings have seen Use X acto knife Dremel tool wire brush clean up ports Apparently three models HP-40 depending local hobby shop got engine stock 1 Old style silver case silver head engine does have chrome-plated liner 2 Silver Star silver case black head engine also does have chrome-plated liner comes two head gaskets thick thin can run engine thick thin gasket will also run both gaskets place 3 Gold Cup black case gold head engine has chrome liner hand-lapped ring rear rotor HP-40 can ordered Dykes ring can front rotor desired stock form bearings sometimes will feel little rough after normal break-in should okay Paul suggests lapping everything sight back plate case front end case head case piston/ring sleeve major modifications needed make engine right stunt cut 030 off top case sleeve fits course requires machinist Next 030 steel shim has made hold head original height final modification dome out head approx imately 1/16 using Dremel milling machine ring should smoothed off top bottom surfaces using Arkansas stone also smooth inside ring using dowel 600 paper Lap ring sleeve set cold ring gap tight 005 loose 004 needle valve should installed locking screws case instances will end up spray bar bearer use ST 46 needle valve assembly will have cut off ears case get spray bar fit use ST 60 needle should fit correctly out cutting off ears Kim Craft needle valve 80 threads per inch opposed ST 46 needle 60 threads per inch can used also fine tuning uniflow tank seems must HP-40 plane upright position engine will normally have 106 Model Aviation lowered away bearers about V8 get correct run dont engine will go rich inverted unless Norm Whittle ended up spray bar almost er clunk tank engine goes lean inverted engines need some break-in time block several flights before start come-in much time needed break-in familiar ST 46 Paul sets engine about 8250 rpm ground Tach using 5% Nitro fuel Rev-up 126 prop Aldrich wide-bar plug will probably have use least 55 oz larger tank Anyone further ideas HP-40 other contemporary engines such Max 40 45s K&B 40s good old ST 46 please write thoughts Nationals 1979 Lincoln Nebraska dates set July 30 Monday through August 4 Saturday stunt flying will follow schedule used last two years MondaySet up judges training TuesdayJunior Senior stunt morning two separate circles Half-A stunt afternoon age classes Wednesday ThursdayOpen stunt qualifying two official flights day either three four circles fliers Friday Semi-finals Open stunt top qualifiers circle flying two officials determine final placing 6th through 20th places top five scorers advancing Final-Finals Walker Cup flyoff Saturday SaturdayFinals Open stunt top five flying three official flights through five placing top Open score compared against flights Junior Senior champions determine Walker Cup winner Judges tabulators runners recorders pit persons pull-test people scoreboard writers go-fers refreshment experts needed volunteer help maintain outstanding reputation PAMPA has earned running Nationals Precision Aerobatics Volunteer writing Keith Trostle 10900 Phillips Drive Upper Marlboro MD 20870 Judges re ceive some remuneration AMA working Other workers can receive free years dues AMA three days work information PAMPA stunt write Wynn Paul 1640 Maywick Drive Lexington KY 40504 CL Racing/Lee continued page 40 mold making Look local yellow pages under plastics resins etc find source supply Most epoxies produced few manufacturers retailers buying bulk repackaging under own brand name might also check some local marketing people Peanut Scale Peanut Scale models eubber powered flying models scaled real aircealt Span stricfly limited 13 may Ilown indoors Outdoors Steeling Peanuts fun build ton fly Designed erperts remark ably realistic appearance grout flyers material reguired kit models encept glue & dope paint addition need pliers straight pins hammer tweezers single edge razor bladetlat building board Saran Wray similar L major oil companies since usually produce epoxies Since work Shell Oil Co able easily obtain information Im sure local marketing representative would happy help asked have ended up using Hysol brand silicafilled casting resin C94 183 H2 3561 hardener combination quite thin forms good mold yet nearly expensive Sears since must buy larger quantities estimate complete both halves mold can made less $500 quite discount $1 4$ 15 other way can buy resin gallon quantities about $35 per gallon hardener quarts about $25 know sounds like quite lot money can make quite lot molds much material hardener also same use prop itself other thing strengthen mold insert piece aluminum angle lengthwise mold spreads load out mold clamp down making prop See drawings illustration pieces go together similar tricks making male half mold illustrated drawings Second prop construction prop will molding consists some sort fiber arranged appropriate order stuck together some sort resin either polyester epoxy selec Name Addeess ________________Cv.....State......Zc tion resin fiber very critical properties resulting propeller have talked several people have built props what use resin have indicated Shell EPON 815 TETA hardener 815 very thin high quality resin exhibits pot life about 30 minutes possible room temperature cure resin/hardener com bination produces very good props excellent heat resistance capability ever recommend combination very important reason safety Shell literature have able find rates both products ANSI classification 4 5 strong sensi tizer extremely irritating fact Shell has discontinued sales TETA presum ably toxicity reasons Vic Garner using combination relates some very uncomfortable skin reactions after taking precaution using gloves handling mixture have found Hysol resin R92039 quite suitable used previ ously mentioned 3561 hardener com bination especially good resistance impact thermal shock according Hysol literature yet very thin has acceptable high temperature resistance Hysol rates 3561 SPI Classification 5 2039 4183 SPI Classification 2 somewhat better 81 5/TETA case must exercise caution using resins Always use some form protective gloves keep resins off April 1979 107 STERLING MODELS 0 ST PIIILA PA 19134 no dcci avariabie direct orders acceytnd ti tO additiedal merge mr Sacatieg shyerrrg bus minimum e US 5t25 minimum eurside USI 7 Catateg entre line airplane contnI line model bits c scale Trainer kits beat medei kits arcesseries err enclosed z secrets ci Model Airpiane Buriding Incieding design censiructren cenering trnrsrerrg tiring adlusting conirci systems etc 25C enele sad C tier, ot Centroi tine Carrie Fining including eretligni seleng stunting Carrier rules regulariens Carrier tiring tintS central lee insraiiaiion insiruoliens 25C enciosed connects Only 05 merry Orders currency accepted
Edition: Model Aviation - 1979/04
Page Numbers: 39, 106, 107
PAMPA Categories 1979 Since contests planned early part year about stepping up local Contest Director asking PAMPA Categories summers contest proposal Ted Fancher Foster City Cal part Pampa Classification System Review Board committee report calls use three PAMPA classes plus use existing AMA Novice Pattern makes very good sense Since already have AMA Novice Pattern logical starting point beginning stunt flier Over past couple years have tried PAMPA categories have seen little use having beginners attempt full pattern appears once flier can complete full pattern will just about automatically fall Intermediate class supposed point range 300 399 Therefore contests should set up following classes Novice AMA Pattern Sportsman takes place Intermediate just better sounding narne300 399 Advanced400 499 Expert500 over event contest manager doesnt want foot bill three additional trophies local condi tions should govern categories combine ie Sportsman Advanced combined Advanced Expert com bined stunt enthusiasts particular area will stand up voice opinions probably contest management will decide put four categories Selection category flier still voluntary basis Despite work Richard Byron maintaining listing stunt fliers averages appears majority contestants just signed up category felt should particular contest appeared few abuses voluntary system Fancher report PAMPA President Trostle makes note proposed review board check over scores proposed PAMPA membership card category listing back will automatically promote flier next higher cate gory after three scores class Remember event directors guide guide setting up contest PAMPA categories still available Wynn Paul just asking Notes H-P 40 engine following ideas recommendations come Continued page 106 April 1979 39 Gary Aispaugh cant faulted lack Imagination Sherry III Twin Fox 35s turning three bladed fans twin tails make conversation piece aswell good performIng machine Its Stott foam wing spans 57 Inches all-up weight 62 oz Wynn Paul photo Tatone Peace Pipe mufflerlnstallatlon Canadian Jeff Hlggs planewith ST46 engine Jeff drilled tapped holes mount muffler engine adding ounce weight Wynn Paul photo winner Ins first day 1979 King Orange internationals Dennis Duvail won PAMPA Ex pert flying semi-scale MIG ST46 engine Built-up model spans 62 weighs 55 oz THE chose Waco F-3 biplane flagship because represents Golden Era 1930s flying adventure Add easy snag-free building safe gentle flyingthe result thorough kit engineering careful prototype development features Platt Kits have satisfying building flying experience ahead Kit featuresTop-quality diecut machined balsa plywood Full size plans Separate instruction book isometrics Decals Injection-moulded vacuum-formed plastic cowl cowl blisters wheel pants required nylon fittings Formed wire langing gear & struts Span 60 Area 950 Sq 4 6 channel Engine good 40 60 Miami Florida 33180 2657 NE 188th Street Telephone 935-1436 several parachuting crew members signal Bettys demise hands Allies Come didnt really expect him crash did heart Kens replica clever internal bomb bay release mechanism devised Five different kinds droppable stores can released bomb bay duplicating capabilities versatile full-scale Bettys basic ideas behind system give great potential use other scale subjects could easily adapted RC scale model Kens letter describes working details main wire runs parallel fuselage inboard side bomb bay Elastic bands glued epoxy opposite side bomb bay Small eyelets wrapped thread epoxied other end elastic bands bands stretched across bomb bay spur wires put through eyelets time beginning longest wire droppable stores put under elastic bands slow pull fourth line will release stores time sequence beauty using elastic bands bomb bay will facilitate different sizes shapes droppable stores will hold fast parachutes folded against dummy figures will hold until released torpedo can carried using first last bands released fast pull release line has functioned flawlessly smoke baby powder released compartment aft wheel well outboard engine nacelle one-inch square hatch bottom cloth hinged hatch door 1 square k soft rubber epoxied inside surface make seal prevent powder escaping until release pin activated air moving past open hatch engine vibration shaking powder down will expel last bit powder Ive found four ounces baby powder ooming through one-inch square opening 60-foot lines travelling reasonable close scale speed will last about two rounds course powder rounds Birds Feather coincidence weve got another twin-engined scale subject spotlight month Phillip Perez brother past contributor Jeff sent us info sport scale version Luftwaffes little-remembered Heinkle He2 19 219 two-seat long-range fighter employed 194344 intercept nightly Allied bombing raids over Ger accomplish equipped radar thus four antenna sticking out nose powerful armament no less six forward-firing cannons Phils scratch-built model has wingspan 60 powered two Testors McCoy 35 engines construction engine nacelles especially noteworthy Typically multiengined scale models difficult get things required confines engine nacelles addition engines fuel tanks often need room landing gear installation gear retractable problem compounds greatly Obviously space critical structure nacelle itself must kept absolute minimum sacrificing strength Phils nacelle construction best idea have seen yet nacelle itself made epoxyglass turn glassed wing structure plywood fire wall removable removed brings engine mount fuel tank tank held onto back firewall metal strap plywood ring mounted nacelle has blind nuts installed accommodate three firewall mounting bolts accom panying drawing photo should give general idea Safety workshop no accident Mike Gretz Box 162 Montezuma IA 50171 CL Aerobatics/Paul continued page 39 Paul Fewell Ft Mitchell Kentucky Unlike Max engines HP-40 really needs disassembled cleaned upon receipt Almost always sleeve ports have flashing residue must cleaned up Several cases metal shavings bearings have seen Use X acto knife Dremel tool wire brush clean up ports Apparently three models HP-40 depending local hobby shop got engine stock 1 Old style silver case silver head engine does have chrome-plated liner 2 Silver Star silver case black head engine also does have chrome-plated liner comes two head gaskets thick thin can run engine thick thin gasket will also run both gaskets place 3 Gold Cup black case gold head engine has chrome liner hand-lapped ring rear rotor HP-40 can ordered Dykes ring can front rotor desired stock form bearings sometimes will feel little rough after normal break-in should okay Paul suggests lapping everything sight back plate case front end case head case piston/ring sleeve major modifications needed make engine right stunt cut 030 off top case sleeve fits course requires machinist Next 030 steel shim has made hold head original height final modification dome out head approx imately 1/16 using Dremel milling machine ring should smoothed off top bottom surfaces using Arkansas stone also smooth inside ring using dowel 600 paper Lap ring sleeve set cold ring gap tight 005 loose 004 needle valve should installed locking screws case instances will end up spray bar bearer use ST 46 needle valve assembly will have cut off ears case get spray bar fit use ST 60 needle should fit correctly out cutting off ears Kim Craft needle valve 80 threads per inch opposed ST 46 needle 60 threads per inch can used also fine tuning uniflow tank seems must HP-40 plane upright position engine will normally have 106 Model Aviation lowered away bearers about V8 get correct run dont engine will go rich inverted unless Norm Whittle ended up spray bar almost er clunk tank engine goes lean inverted engines need some break-in time block several flights before start come-in much time needed break-in familiar ST 46 Paul sets engine about 8250 rpm ground Tach using 5% Nitro fuel Rev-up 126 prop Aldrich wide-bar plug will probably have use least 55 oz larger tank Anyone further ideas HP-40 other contemporary engines such Max 40 45s K&B 40s good old ST 46 please write thoughts Nationals 1979 Lincoln Nebraska dates set July 30 Monday through August 4 Saturday stunt flying will follow schedule used last two years MondaySet up judges training TuesdayJunior Senior stunt morning two separate circles Half-A stunt afternoon age classes Wednesday ThursdayOpen stunt qualifying two official flights day either three four circles fliers Friday Semi-finals Open stunt top qualifiers circle flying two officials determine final placing 6th through 20th places top five scorers advancing Final-Finals Walker Cup flyoff Saturday SaturdayFinals Open stunt top five flying three official flights through five placing top Open score compared against flights Junior Senior champions determine Walker Cup winner Judges tabulators runners recorders pit persons pull-test people scoreboard writers go-fers refreshment experts needed volunteer help maintain outstanding reputation PAMPA has earned running Nationals Precision Aerobatics Volunteer writing Keith Trostle 10900 Phillips Drive Upper Marlboro MD 20870 Judges re ceive some remuneration AMA working Other workers can receive free years dues AMA three days work information PAMPA stunt write Wynn Paul 1640 Maywick Drive Lexington KY 40504 CL Racing/Lee continued page 40 mold making Look local yellow pages under plastics resins etc find source supply Most epoxies produced few manufacturers retailers buying bulk repackaging under own brand name might also check some local marketing people Peanut Scale Peanut Scale models eubber powered flying models scaled real aircealt Span stricfly limited 13 may Ilown indoors Outdoors Steeling Peanuts fun build ton fly Designed erperts remark ably realistic appearance grout flyers material reguired kit models encept glue & dope paint addition need pliers straight pins hammer tweezers single edge razor bladetlat building board Saran Wray similar L major oil companies since usually produce epoxies Since work Shell Oil Co able easily obtain information Im sure local marketing representative would happy help asked have ended up using Hysol brand silicafilled casting resin C94 183 H2 3561 hardener combination quite thin forms good mold yet nearly expensive Sears since must buy larger quantities estimate complete both halves mold can made less $500 quite discount $1 4$ 15 other way can buy resin gallon quantities about $35 per gallon hardener quarts about $25 know sounds like quite lot money can make quite lot molds much material hardener also same use prop itself other thing strengthen mold insert piece aluminum angle lengthwise mold spreads load out mold clamp down making prop See drawings illustration pieces go together similar tricks making male half mold illustrated drawings Second prop construction prop will molding consists some sort fiber arranged appropriate order stuck together some sort resin either polyester epoxy selec Name Addeess ________________Cv.....State......Zc tion resin fiber very critical properties resulting propeller have talked several people have built props what use resin have indicated Shell EPON 815 TETA hardener 815 very thin high quality resin exhibits pot life about 30 minutes possible room temperature cure resin/hardener com bination produces very good props excellent heat resistance capability ever recommend combination very important reason safety Shell literature have able find rates both products ANSI classification 4 5 strong sensi tizer extremely irritating fact Shell has discontinued sales TETA presum ably toxicity reasons Vic Garner using combination relates some very uncomfortable skin reactions after taking precaution using gloves handling mixture have found Hysol resin R92039 quite suitable used previ ously mentioned 3561 hardener com bination especially good resistance impact thermal shock according Hysol literature yet very thin has acceptable high temperature resistance Hysol rates 3561 SPI Classification 5 2039 4183 SPI Classification 2 somewhat better 81 5/TETA case must exercise caution using resins Always use some form protective gloves keep resins off April 1979 107 STERLING MODELS 0 ST PIIILA PA 19134 no dcci avariabie direct orders acceytnd ti tO additiedal merge mr Sacatieg shyerrrg bus minimum e US 5t25 minimum eurside USI 7 Catateg entre line airplane contnI line model bits c scale Trainer kits beat medei kits arcesseries err enclosed z secrets ci Model Airpiane Buriding Incieding design censiructren cenering trnrsrerrg tiring adlusting conirci systems etc 25C enele sad C tier, ot Centroi tine Carrie Fining including eretligni seleng stunting Carrier rules regulariens Carrier tiring tintS central lee insraiiaiion insiruoliens 25C enciosed connects Only 05 merry Orders currency accepted
Edition: Model Aviation - 1979/04
Page Numbers: 39, 106, 107
PAMPA Categories 1979 Since contests planned early part year about stepping up local Contest Director asking PAMPA Categories summers contest proposal Ted Fancher Foster City Cal part Pampa Classification System Review Board committee report calls use three PAMPA classes plus use existing AMA Novice Pattern makes very good sense Since already have AMA Novice Pattern logical starting point beginning stunt flier Over past couple years have tried PAMPA categories have seen little use having beginners attempt full pattern appears once flier can complete full pattern will just about automatically fall Intermediate class supposed point range 300 399 Therefore contests should set up following classes Novice AMA Pattern Sportsman takes place Intermediate just better sounding narne300 399 Advanced400 499 Expert500 over event contest manager doesnt want foot bill three additional trophies local condi tions should govern categories combine ie Sportsman Advanced combined Advanced Expert com bined stunt enthusiasts particular area will stand up voice opinions probably contest management will decide put four categories Selection category flier still voluntary basis Despite work Richard Byron maintaining listing stunt fliers averages appears majority contestants just signed up category felt should particular contest appeared few abuses voluntary system Fancher report PAMPA President Trostle makes note proposed review board check over scores proposed PAMPA membership card category listing back will automatically promote flier next higher cate gory after three scores class Remember event directors guide guide setting up contest PAMPA categories still available Wynn Paul just asking Notes H-P 40 engine following ideas recommendations come Continued page 106 April 1979 39 Gary Aispaugh cant faulted lack Imagination Sherry III Twin Fox 35s turning three bladed fans twin tails make conversation piece aswell good performIng machine Its Stott foam wing spans 57 Inches all-up weight 62 oz Wynn Paul photo Tatone Peace Pipe mufflerlnstallatlon Canadian Jeff Hlggs planewith ST46 engine Jeff drilled tapped holes mount muffler engine adding ounce weight Wynn Paul photo winner Ins first day 1979 King Orange internationals Dennis Duvail won PAMPA Ex pert flying semi-scale MIG ST46 engine Built-up model spans 62 weighs 55 oz THE chose Waco F-3 biplane flagship because represents Golden Era 1930s flying adventure Add easy snag-free building safe gentle flyingthe result thorough kit engineering careful prototype development features Platt Kits have satisfying building flying experience ahead Kit featuresTop-quality diecut machined balsa plywood Full size plans Separate instruction book isometrics Decals Injection-moulded vacuum-formed plastic cowl cowl blisters wheel pants required nylon fittings Formed wire langing gear & struts Span 60 Area 950 Sq 4 6 channel Engine good 40 60 Miami Florida 33180 2657 NE 188th Street Telephone 935-1436 several parachuting crew members signal Bettys demise hands Allies Come didnt really expect him crash did heart Kens replica clever internal bomb bay release mechanism devised Five different kinds droppable stores can released bomb bay duplicating capabilities versatile full-scale Bettys basic ideas behind system give great potential use other scale subjects could easily adapted RC scale model Kens letter describes working details main wire runs parallel fuselage inboard side bomb bay Elastic bands glued epoxy opposite side bomb bay Small eyelets wrapped thread epoxied other end elastic bands bands stretched across bomb bay spur wires put through eyelets time beginning longest wire droppable stores put under elastic bands slow pull fourth line will release stores time sequence beauty using elastic bands bomb bay will facilitate different sizes shapes droppable stores will hold fast parachutes folded against dummy figures will hold until released torpedo can carried using first last bands released fast pull release line has functioned flawlessly smoke baby powder released compartment aft wheel well outboard engine nacelle one-inch square hatch bottom cloth hinged hatch door 1 square k soft rubber epoxied inside surface make seal prevent powder escaping until release pin activated air moving past open hatch engine vibration shaking powder down will expel last bit powder Ive found four ounces baby powder ooming through one-inch square opening 60-foot lines travelling reasonable close scale speed will last about two rounds course powder rounds Birds Feather coincidence weve got another twin-engined scale subject spotlight month Phillip Perez brother past contributor Jeff sent us info sport scale version Luftwaffes little-remembered Heinkle He2 19 219 two-seat long-range fighter employed 194344 intercept nightly Allied bombing raids over Ger accomplish equipped radar thus four antenna sticking out nose powerful armament no less six forward-firing cannons Phils scratch-built model has wingspan 60 powered two Testors McCoy 35 engines construction engine nacelles especially noteworthy Typically multiengined scale models difficult get things required confines engine nacelles addition engines fuel tanks often need room landing gear installation gear retractable problem compounds greatly Obviously space critical structure nacelle itself must kept absolute minimum sacrificing strength Phils nacelle construction best idea have seen yet nacelle itself made epoxyglass turn glassed wing structure plywood fire wall removable removed brings engine mount fuel tank tank held onto back firewall metal strap plywood ring mounted nacelle has blind nuts installed accommodate three firewall mounting bolts accom panying drawing photo should give general idea Safety workshop no accident Mike Gretz Box 162 Montezuma IA 50171 CL Aerobatics/Paul continued page 39 Paul Fewell Ft Mitchell Kentucky Unlike Max engines HP-40 really needs disassembled cleaned upon receipt Almost always sleeve ports have flashing residue must cleaned up Several cases metal shavings bearings have seen Use X acto knife Dremel tool wire brush clean up ports Apparently three models HP-40 depending local hobby shop got engine stock 1 Old style silver case silver head engine does have chrome-plated liner 2 Silver Star silver case black head engine also does have chrome-plated liner comes two head gaskets thick thin can run engine thick thin gasket will also run both gaskets place 3 Gold Cup black case gold head engine has chrome liner hand-lapped ring rear rotor HP-40 can ordered Dykes ring can front rotor desired stock form bearings sometimes will feel little rough after normal break-in should okay Paul suggests lapping everything sight back plate case front end case head case piston/ring sleeve major modifications needed make engine right stunt cut 030 off top case sleeve fits course requires machinist Next 030 steel shim has made hold head original height final modification dome out head approx imately 1/16 using Dremel milling machine ring should smoothed off top bottom surfaces using Arkansas stone also smooth inside ring using dowel 600 paper Lap ring sleeve set cold ring gap tight 005 loose 004 needle valve should installed locking screws case instances will end up spray bar bearer use ST 46 needle valve assembly will have cut off ears case get spray bar fit use ST 60 needle should fit correctly out cutting off ears Kim Craft needle valve 80 threads per inch opposed ST 46 needle 60 threads per inch can used also fine tuning uniflow tank seems must HP-40 plane upright position engine will normally have 106 Model Aviation lowered away bearers about V8 get correct run dont engine will go rich inverted unless Norm Whittle ended up spray bar almost er clunk tank engine goes lean inverted engines need some break-in time block several flights before start come-in much time needed break-in familiar ST 46 Paul sets engine about 8250 rpm ground Tach using 5% Nitro fuel Rev-up 126 prop Aldrich wide-bar plug will probably have use least 55 oz larger tank Anyone further ideas HP-40 other contemporary engines such Max 40 45s K&B 40s good old ST 46 please write thoughts Nationals 1979 Lincoln Nebraska dates set July 30 Monday through August 4 Saturday stunt flying will follow schedule used last two years MondaySet up judges training TuesdayJunior Senior stunt morning two separate circles Half-A stunt afternoon age classes Wednesday ThursdayOpen stunt qualifying two official flights day either three four circles fliers Friday Semi-finals Open stunt top qualifiers circle flying two officials determine final placing 6th through 20th places top five scorers advancing Final-Finals Walker Cup flyoff Saturday SaturdayFinals Open stunt top five flying three official flights through five placing top Open score compared against flights Junior Senior champions determine Walker Cup winner Judges tabulators runners recorders pit persons pull-test people scoreboard writers go-fers refreshment experts needed volunteer help maintain outstanding reputation PAMPA has earned running Nationals Precision Aerobatics Volunteer writing Keith Trostle 10900 Phillips Drive Upper Marlboro MD 20870 Judges re ceive some remuneration AMA working Other workers can receive free years dues AMA three days work information PAMPA stunt write Wynn Paul 1640 Maywick Drive Lexington KY 40504 CL Racing/Lee continued page 40 mold making Look local yellow pages under plastics resins etc find source supply Most epoxies produced few manufacturers retailers buying bulk repackaging under own brand name might also check some local marketing people Peanut Scale Peanut Scale models eubber powered flying models scaled real aircealt Span stricfly limited 13 may Ilown indoors Outdoors Steeling Peanuts fun build ton fly Designed erperts remark ably realistic appearance grout flyers material reguired kit models encept glue & dope paint addition need pliers straight pins hammer tweezers single edge razor bladetlat building board Saran Wray similar L major oil companies since usually produce epoxies Since work Shell Oil Co able easily obtain information Im sure local marketing representative would happy help asked have ended up using Hysol brand silicafilled casting resin C94 183 H2 3561 hardener combination quite thin forms good mold yet nearly expensive Sears since must buy larger quantities estimate complete both halves mold can made less $500 quite discount $1 4$ 15 other way can buy resin gallon quantities about $35 per gallon hardener quarts about $25 know sounds like quite lot money can make quite lot molds much material hardener also same use prop itself other thing strengthen mold insert piece aluminum angle lengthwise mold spreads load out mold clamp down making prop See drawings illustration pieces go together similar tricks making male half mold illustrated drawings Second prop construction prop will molding consists some sort fiber arranged appropriate order stuck together some sort resin either polyester epoxy selec Name Addeess ________________Cv.....State......Zc tion resin fiber very critical properties resulting propeller have talked several people have built props what use resin have indicated Shell EPON 815 TETA hardener 815 very thin high quality resin exhibits pot life about 30 minutes possible room temperature cure resin/hardener com bination produces very good props excellent heat resistance capability ever recommend combination very important reason safety Shell literature have able find rates both products ANSI classification 4 5 strong sensi tizer extremely irritating fact Shell has discontinued sales TETA presum ably toxicity reasons Vic Garner using combination relates some very uncomfortable skin reactions after taking precaution using gloves handling mixture have found Hysol resin R92039 quite suitable used previ ously mentioned 3561 hardener com bination especially good resistance impact thermal shock according Hysol literature yet very thin has acceptable high temperature resistance Hysol rates 3561 SPI Classification 5 2039 4183 SPI Classification 2 somewhat better 81 5/TETA case must exercise caution using resins Always use some form protective gloves keep resins off April 1979 107 STERLING MODELS 0 ST PIIILA PA 19134 no dcci avariabie direct orders acceytnd ti tO additiedal merge mr Sacatieg shyerrrg bus minimum e US 5t25 minimum eurside USI 7 Catateg entre line airplane contnI line model bits c scale Trainer kits beat medei kits arcesseries err enclosed z secrets ci Model Airpiane Buriding Incieding design censiructren cenering trnrsrerrg tiring adlusting conirci systems etc 25C enele sad C tier, ot Centroi tine Carrie Fining including eretligni seleng stunting Carrier rules regulariens Carrier tiring tintS central lee insraiiaiion insiruoliens 25C enciosed connects Only 05 merry Orders currency accepted