NURNBERG magnet Euro pean model trade February New exhibition halls gave space 78 somehow scene did excite pulse like before Yet lots new see no slackening attendance personalities hobby world looking prosperous after tough 1977 So should years Interna tional Hobby Fair seem shade off-key 5EI1 EIC 29th International Toy Fair Germany Model First The trend cars immense anyone thing fit crankshaft propeller diversification holds nothing air men Just about everyone ran car section booth thats way RC moving sure Second The new Halls confuse crafts kiddy books like dyed wool model hobby people identifica tion wasnt clear cut enougheven extent some long-established manu facturers took lot hunting down will course cured next time Third There signs running out outstanding ideas Imaginative trendsetters getting scarcer model plane field Now have electrics ducted fans engines CO2 90 sailplanes plastic scale types kind Among noteworthy products show 1 Topps Cobraa real hithad droop leading edge 2 Webras geared-down drive big props standard engines 3 Topps Mir age 2000 pusher delta-winged RC 4 Shark twin C02 Harden Associates 5 Multiplex 20-powered sport/trainer new RC sports trend 6 Robbe scale Ogar Polish powered sailplane glass-fiber fuselage 140-in span 7 Svenson Belgium scale Fieseler Storch 8-ft beauty full STOL abilities Ron Moulton Aviations co pondent reports world-wide trends presents selected highlights June 1978 35 36 Model Aviation fidelity kits theres no space shelves themits time think hard dealer could have spent fortune ordersand still made wrong decisions year unless clear understanding way custom ers going thinking Whos know sailplane going soar greater popularity RC thermal slope soarers topsellers Europe whether stay way pricey sophistication another guess Deutsche Mark 50 cents German prices heading 300-dollar glider money get lot model Like 150-in Ascale Astir Klinger Wik its 1/5scale sister 143-in Twin Astir Car reras big Mistral over 14-ft span SBIO around 17 ft 8 Jerry Nelson Vaclav Horcicka HP discuss Gold Cup engine 9 OPS 15cc Marine 10 Jaures Garofoli Supertigre latest 46 11 HBs Car Special 35 engine AC cars over whelming trend Europe 12 Kato Iits new mini version Prettners Cu rare 13 Sectioned display Webra 91 brute engine power match 14 Multi CO2 units Harden drive big propsup 16 15 Marx Elek tro-Jet has Duoperm 36v 20A motor triple nicads drives 7-5 prop impressive ly Recharge contacts located mock pipes rear 16 HP Gold Cup 61 NO OCR TEXT 17 Swedish Demo 18cc Twin cutaway show interior 18 05 20cc Big Twin push rods suggest 4-cycle 19 Graup ner Robin Sport Scale Glider Tow 20 Bauer Models Habicht scale aerobatic sailplane ARTF costing some $200 21 Big scale Wolfgang Rodel includes 7-ft Cub 6-ft Turbo Trainer 7-ft Flamingo shown Note scale subjects Almost newies sheer elegance modeled 11-ft semi-scale 19s Sitar Bros influence high-speed slope flying evident sharp Flamingo Multi plex Carreras Sagitta actual rec ord holder Microprop stand pro mote Brand RC Continued page 91 after full-size Graupners near-12-ft Mini Nimbus classic span foam wings built-up variant shorter 9 heres real deal flies best rudder spoilers sales people say Other scale types take eye Bauers DES Habicht gull-wing vintage open-cockpit aero batic Multiplexs ASW 20 Wanit scheks superb pair 12-ft P1K 20 14-ft Jantar 2 theres sailplane field Robbe taken Pol ish power-assist two-seater Ogar has 38 Model Aviation lined up mechanical line force remove tendency blade change pitch working would advantageous especially thin blades used Another design consideration preces sion no confused preces sion force created through gyroscopic action prop rotation Precession simply moving ahead point thrust would normally applied blade propeller arc normal blade shapes center line thrust coin cides line passes through center engine shaft looking front shaft top view pro peller blade center line rota tion blade angles created center As blade moves through arc rotation con sidered line along thrust generated Pitch also measured line center line thrust can moved ahead center line rotation effective angle blade arc rotation will increased changing physical angle advantage precession crease pitch adding drag Drag created physical angle blades precession change physical angle effective change pitch can used advantage air craft requires 7 pitch terminal ve locity precession prop pitch can 6 example will still have effective pitch 7 lower drag 6/4 physical pitch plus factor combined lower drag will allow engine rpm power drawback precession moves center line thrust away line mechanical force torsional rotation force created possible rigid blades torsional rotation force could disregarded taking advan tage precession instead stan dard prop shape precession added shown diagram No 4 Diagrams No 5 6 show design factors can incorporated blade shape Before finalizing ideas may wish try custom made props type blade airfoil should considered considerations blade airfoil same wing wish greatest lift possible least amount dragthe old L/D ratio again Secondly air speed should con sidered Formula propeller stance average blade air speed about 350 mph tip speed ap proaching sonic range An airfoil de veloped speed ranges would efficient modern airfoils have excellent lift-drag ratio far less drag older styles amount drag reduced serious loss lift result same adding horse power part II will show can transform thse ideas actual props own workshop Additionally will explain test tailor particular needs Nurnberg/Moulton continued page 38 Just gliders mostly scale eyccatching power kits after seeing Katos 20 & 40 versions Prettners Curare host electrics ranging Aeronauts BD-5 Udet Flamingo Graupners Elektra-fly Elektro-Max Queen show scribe undoubtedly 8-ft Svenson Storch 60s Its big rugged functional intended fly STOL lots power big prop fine pitch Fixed slats power ful flaps tail feathers plus longstroke landing gear rest won der no German firm did firstSven son Belgian Cessnas abound Cox RTF Carreras plastic Wichita replicas cater constant demand Graupner has gone Jodel Robin DR400 big way brochures say itll take new OS 90 especially used tow sailplanes Other big scale kits Wolfgang Rodel has MBB 233 Flamingo June1978 91 25cc smaller Suit 40s Also Pilatus PC7 Turbo Trainer 60s Strictly European big lowwings offer lots fuselage room ruggedness suit grass fields None rugged Topps ARTF Class 2 scale line has expanded sleek Mirage 2000 stunning F-18 Cobra has droop snoot leading edges latest camou ouflage looks part model 80s sells around $160 Germany Sport RC also has its share innova tions Another flush trainer kits include several 20 engines trend upheld RC gear itself Last show saw rash super-sophisticated equipment controls would take ace handle year same trend perpetuated yet toned down shade modular concept becomes common place Almost manufacturer now add-a-box state frequency purpose can changed plugging-in another module Multiplex put control mixer Ix way like several other prominent German firms have sunk national pride badge-engineered Japanese imports meet sports market other wise neglecting Thus Futaba Sanwa product review product review product review Whats Angle Measuring rigging angles wings tails thrust lines offset thrust etc. has always irksome task unrealized error could effect flight perfor mance Robarts new incidence meter ends use adjustable notched tops positioned steel bar according type measurement made box containing steel counterweight pre cision pointer dial scale also slides bar required Operation simple using carpenters level Price $1595 Ro bart PO Box 122 Wheaton 1160187 product review product review product review JM 10 etc. have strong grip dont always appear under own name Did someone say What about en gines---helicopters Only Dieter Schlut ers Heli-Boy acrobatic version Bell 222 could claimed new among rotary wings thats sign consolidation Helicopter trainer pads coming solu tion training risk clever never-leave-the-ground device Hel mut Fett Cologne said selling generation garden fliers want no simulate flight risk As engines car boom has fluence has boosted 19 size opposite end big Sueva 25 05 20 Damo 18 cc sizes plus new OS 90 OPS 65 show way trade thinking Only Webra has thought lunior size produced 15 cc 09 theres hardly unit show throttle way stimulate young CL flier free-flight sportster Engine Technique/Jehlik continued page 49 ideal RC applications million words said about fuel systems Im going try summarize few RC aircraft Since fuel system subjected relatively long distances fuel draw vertical climb large varia tions fuel pressure point pickup maneuvers use fuel pumps rec ommended may supplemented servo-controlled needle valve special applications Control Line Although understood Stockton Chicken Hooper concept adaptable CL events result being perfectly constant runs throughout flight am unaware other fuel tank design provides level performance Ill glad answer questions about adaptation hop pers tanks different events Carburetors carburetor acts partial regulator velocity air venturi throat results lowered air pres NEW/ MUFF-L-IT SERIES Available e C engines Sis eight Ob reduction noise engines Proportional nolumne expan sion chamber Large exhaust nozzle low back pressure 4 Little no loss power REGULAR & NO 30109-191749 No 0022940t839 no 30340801949 *nI o B d C y00fl No 304N4 wln 51095 NO305R4294011195 No30km488411395 1/2A MUFFLER Fits COX 049 engInes NO 30080491149 No ODIN0511149 sure provides suction draw fuel carburetor degree needle valve opening will allow much fuel pass given setting get idea variation attach fuel line about 12 long tank adjust en gine tank located carburetor level raise lower tank will observe engine change very rich very lean depending vertical location tank regula tion provided carburetor slight Engines Can tolerate wide range fuel settings Simply put power curve engines relatively flat peak power settings means can generally adjust engine run up 1000 rpm rich peak setting still use nearly maximum power Forces Gravity basic force usu ally smallest force affecting model fuel system G forces maneuvers can approach 40 centrifugal forces CL speed models over 20 times gravity Vibration air stream forces tend cause fuel foam tanks recent approach Dave Gierke places fuel bladder hard tank will eliminate foaming air enters tank outside bladder fuel inside system used Huntsville speed fliers Dick Hall Bob Lauderdale FAI CL speed models early 60s system eliminates Inland Sport eye-catcning classic orom Golden Era VNJith 37% span Herb Clu key-designed parasol scale RC model takes 02 electric 049 power excellent schoolyard flying Decals printed balsa rolled plans proof-of-scale data etc Price $1395 Flyline Models Inc. 2820 Dorr Ave B-2 Fairfax VA 22030 product review product review product review 92 Model Aviation Droduct review product review product review
Edition: Model Aviation - 1978/06
Page Numbers: 34, 35, 36, 37, 38, 91, 92
NURNBERG magnet Euro pean model trade February New exhibition halls gave space 78 somehow scene did excite pulse like before Yet lots new see no slackening attendance personalities hobby world looking prosperous after tough 1977 So should years Interna tional Hobby Fair seem shade off-key 5EI1 EIC 29th International Toy Fair Germany Model First The trend cars immense anyone thing fit crankshaft propeller diversification holds nothing air men Just about everyone ran car section booth thats way RC moving sure Second The new Halls confuse crafts kiddy books like dyed wool model hobby people identifica tion wasnt clear cut enougheven extent some long-established manu facturers took lot hunting down will course cured next time Third There signs running out outstanding ideas Imaginative trendsetters getting scarcer model plane field Now have electrics ducted fans engines CO2 90 sailplanes plastic scale types kind Among noteworthy products show 1 Topps Cobraa real hithad droop leading edge 2 Webras geared-down drive big props standard engines 3 Topps Mir age 2000 pusher delta-winged RC 4 Shark twin C02 Harden Associates 5 Multiplex 20-powered sport/trainer new RC sports trend 6 Robbe scale Ogar Polish powered sailplane glass-fiber fuselage 140-in span 7 Svenson Belgium scale Fieseler Storch 8-ft beauty full STOL abilities Ron Moulton Aviations co pondent reports world-wide trends presents selected highlights June 1978 35 36 Model Aviation fidelity kits theres no space shelves themits time think hard dealer could have spent fortune ordersand still made wrong decisions year unless clear understanding way custom ers going thinking Whos know sailplane going soar greater popularity RC thermal slope soarers topsellers Europe whether stay way pricey sophistication another guess Deutsche Mark 50 cents German prices heading 300-dollar glider money get lot model Like 150-in Ascale Astir Klinger Wik its 1/5scale sister 143-in Twin Astir Car reras big Mistral over 14-ft span SBIO around 17 ft 8 Jerry Nelson Vaclav Horcicka HP discuss Gold Cup engine 9 OPS 15cc Marine 10 Jaures Garofoli Supertigre latest 46 11 HBs Car Special 35 engine AC cars over whelming trend Europe 12 Kato Iits new mini version Prettners Cu rare 13 Sectioned display Webra 91 brute engine power match 14 Multi CO2 units Harden drive big propsup 16 15 Marx Elek tro-Jet has Duoperm 36v 20A motor triple nicads drives 7-5 prop impressive ly Recharge contacts located mock pipes rear 16 HP Gold Cup 61 NO OCR TEXT 17 Swedish Demo 18cc Twin cutaway show interior 18 05 20cc Big Twin push rods suggest 4-cycle 19 Graup ner Robin Sport Scale Glider Tow 20 Bauer Models Habicht scale aerobatic sailplane ARTF costing some $200 21 Big scale Wolfgang Rodel includes 7-ft Cub 6-ft Turbo Trainer 7-ft Flamingo shown Note scale subjects Almost newies sheer elegance modeled 11-ft semi-scale 19s Sitar Bros influence high-speed slope flying evident sharp Flamingo Multi plex Carreras Sagitta actual rec ord holder Microprop stand pro mote Brand RC Continued page 91 after full-size Graupners near-12-ft Mini Nimbus classic span foam wings built-up variant shorter 9 heres real deal flies best rudder spoilers sales people say Other scale types take eye Bauers DES Habicht gull-wing vintage open-cockpit aero batic Multiplexs ASW 20 Wanit scheks superb pair 12-ft P1K 20 14-ft Jantar 2 theres sailplane field Robbe taken Pol ish power-assist two-seater Ogar has 38 Model Aviation lined up mechanical line force remove tendency blade change pitch working would advantageous especially thin blades used Another design consideration preces sion no confused preces sion force created through gyroscopic action prop rotation Precession simply moving ahead point thrust would normally applied blade propeller arc normal blade shapes center line thrust coin cides line passes through center engine shaft looking front shaft top view pro peller blade center line rota tion blade angles created center As blade moves through arc rotation con sidered line along thrust generated Pitch also measured line center line thrust can moved ahead center line rotation effective angle blade arc rotation will increased changing physical angle advantage precession crease pitch adding drag Drag created physical angle blades precession change physical angle effective change pitch can used advantage air craft requires 7 pitch terminal ve locity precession prop pitch can 6 example will still have effective pitch 7 lower drag 6/4 physical pitch plus factor combined lower drag will allow engine rpm power drawback precession moves center line thrust away line mechanical force torsional rotation force created possible rigid blades torsional rotation force could disregarded taking advan tage precession instead stan dard prop shape precession added shown diagram No 4 Diagrams No 5 6 show design factors can incorporated blade shape Before finalizing ideas may wish try custom made props type blade airfoil should considered considerations blade airfoil same wing wish greatest lift possible least amount dragthe old L/D ratio again Secondly air speed should con sidered Formula propeller stance average blade air speed about 350 mph tip speed ap proaching sonic range An airfoil de veloped speed ranges would efficient modern airfoils have excellent lift-drag ratio far less drag older styles amount drag reduced serious loss lift result same adding horse power part II will show can transform thse ideas actual props own workshop Additionally will explain test tailor particular needs Nurnberg/Moulton continued page 38 Just gliders mostly scale eyccatching power kits after seeing Katos 20 & 40 versions Prettners Curare host electrics ranging Aeronauts BD-5 Udet Flamingo Graupners Elektra-fly Elektro-Max Queen show scribe undoubtedly 8-ft Svenson Storch 60s Its big rugged functional intended fly STOL lots power big prop fine pitch Fixed slats power ful flaps tail feathers plus longstroke landing gear rest won der no German firm did firstSven son Belgian Cessnas abound Cox RTF Carreras plastic Wichita replicas cater constant demand Graupner has gone Jodel Robin DR400 big way brochures say itll take new OS 90 especially used tow sailplanes Other big scale kits Wolfgang Rodel has MBB 233 Flamingo June1978 91 25cc smaller Suit 40s Also Pilatus PC7 Turbo Trainer 60s Strictly European big lowwings offer lots fuselage room ruggedness suit grass fields None rugged Topps ARTF Class 2 scale line has expanded sleek Mirage 2000 stunning F-18 Cobra has droop snoot leading edges latest camou ouflage looks part model 80s sells around $160 Germany Sport RC also has its share innova tions Another flush trainer kits include several 20 engines trend upheld RC gear itself Last show saw rash super-sophisticated equipment controls would take ace handle year same trend perpetuated yet toned down shade modular concept becomes common place Almost manufacturer now add-a-box state frequency purpose can changed plugging-in another module Multiplex put control mixer Ix way like several other prominent German firms have sunk national pride badge-engineered Japanese imports meet sports market other wise neglecting Thus Futaba Sanwa product review product review product review Whats Angle Measuring rigging angles wings tails thrust lines offset thrust etc. has always irksome task unrealized error could effect flight perfor mance Robarts new incidence meter ends use adjustable notched tops positioned steel bar according type measurement made box containing steel counterweight pre cision pointer dial scale also slides bar required Operation simple using carpenters level Price $1595 Ro bart PO Box 122 Wheaton 1160187 product review product review product review JM 10 etc. have strong grip dont always appear under own name Did someone say What about en gines---helicopters Only Dieter Schlut ers Heli-Boy acrobatic version Bell 222 could claimed new among rotary wings thats sign consolidation Helicopter trainer pads coming solu tion training risk clever never-leave-the-ground device Hel mut Fett Cologne said selling generation garden fliers want no simulate flight risk As engines car boom has fluence has boosted 19 size opposite end big Sueva 25 05 20 Damo 18 cc sizes plus new OS 90 OPS 65 show way trade thinking Only Webra has thought lunior size produced 15 cc 09 theres hardly unit show throttle way stimulate young CL flier free-flight sportster Engine Technique/Jehlik continued page 49 ideal RC applications million words said about fuel systems Im going try summarize few RC aircraft Since fuel system subjected relatively long distances fuel draw vertical climb large varia tions fuel pressure point pickup maneuvers use fuel pumps rec ommended may supplemented servo-controlled needle valve special applications Control Line Although understood Stockton Chicken Hooper concept adaptable CL events result being perfectly constant runs throughout flight am unaware other fuel tank design provides level performance Ill glad answer questions about adaptation hop pers tanks different events Carburetors carburetor acts partial regulator velocity air venturi throat results lowered air pres NEW/ MUFF-L-IT SERIES Available e C engines Sis eight Ob reduction noise engines Proportional nolumne expan sion chamber Large exhaust nozzle low back pressure 4 Little no loss power REGULAR & NO 30109-191749 No 0022940t839 no 30340801949 *nI o B d C y00fl No 304N4 wln 51095 NO305R4294011195 No30km488411395 1/2A MUFFLER Fits COX 049 engInes NO 30080491149 No ODIN0511149 sure provides suction draw fuel carburetor degree needle valve opening will allow much fuel pass given setting get idea variation attach fuel line about 12 long tank adjust en gine tank located carburetor level raise lower tank will observe engine change very rich very lean depending vertical location tank regula tion provided carburetor slight Engines Can tolerate wide range fuel settings Simply put power curve engines relatively flat peak power settings means can generally adjust engine run up 1000 rpm rich peak setting still use nearly maximum power Forces Gravity basic force usu ally smallest force affecting model fuel system G forces maneuvers can approach 40 centrifugal forces CL speed models over 20 times gravity Vibration air stream forces tend cause fuel foam tanks recent approach Dave Gierke places fuel bladder hard tank will eliminate foaming air enters tank outside bladder fuel inside system used Huntsville speed fliers Dick Hall Bob Lauderdale FAI CL speed models early 60s system eliminates Inland Sport eye-catcning classic orom Golden Era VNJith 37% span Herb Clu key-designed parasol scale RC model takes 02 electric 049 power excellent schoolyard flying Decals printed balsa rolled plans proof-of-scale data etc Price $1395 Flyline Models Inc. 2820 Dorr Ave B-2 Fairfax VA 22030 product review product review product review 92 Model Aviation Droduct review product review product review
Edition: Model Aviation - 1978/06
Page Numbers: 34, 35, 36, 37, 38, 91, 92
NURNBERG magnet Euro pean model trade February New exhibition halls gave space 78 somehow scene did excite pulse like before Yet lots new see no slackening attendance personalities hobby world looking prosperous after tough 1977 So should years Interna tional Hobby Fair seem shade off-key 5EI1 EIC 29th International Toy Fair Germany Model First The trend cars immense anyone thing fit crankshaft propeller diversification holds nothing air men Just about everyone ran car section booth thats way RC moving sure Second The new Halls confuse crafts kiddy books like dyed wool model hobby people identifica tion wasnt clear cut enougheven extent some long-established manu facturers took lot hunting down will course cured next time Third There signs running out outstanding ideas Imaginative trendsetters getting scarcer model plane field Now have electrics ducted fans engines CO2 90 sailplanes plastic scale types kind Among noteworthy products show 1 Topps Cobraa real hithad droop leading edge 2 Webras geared-down drive big props standard engines 3 Topps Mir age 2000 pusher delta-winged RC 4 Shark twin C02 Harden Associates 5 Multiplex 20-powered sport/trainer new RC sports trend 6 Robbe scale Ogar Polish powered sailplane glass-fiber fuselage 140-in span 7 Svenson Belgium scale Fieseler Storch 8-ft beauty full STOL abilities Ron Moulton Aviations co pondent reports world-wide trends presents selected highlights June 1978 35 36 Model Aviation fidelity kits theres no space shelves themits time think hard dealer could have spent fortune ordersand still made wrong decisions year unless clear understanding way custom ers going thinking Whos know sailplane going soar greater popularity RC thermal slope soarers topsellers Europe whether stay way pricey sophistication another guess Deutsche Mark 50 cents German prices heading 300-dollar glider money get lot model Like 150-in Ascale Astir Klinger Wik its 1/5scale sister 143-in Twin Astir Car reras big Mistral over 14-ft span SBIO around 17 ft 8 Jerry Nelson Vaclav Horcicka HP discuss Gold Cup engine 9 OPS 15cc Marine 10 Jaures Garofoli Supertigre latest 46 11 HBs Car Special 35 engine AC cars over whelming trend Europe 12 Kato Iits new mini version Prettners Cu rare 13 Sectioned display Webra 91 brute engine power match 14 Multi CO2 units Harden drive big propsup 16 15 Marx Elek tro-Jet has Duoperm 36v 20A motor triple nicads drives 7-5 prop impressive ly Recharge contacts located mock pipes rear 16 HP Gold Cup 61 NO OCR TEXT 17 Swedish Demo 18cc Twin cutaway show interior 18 05 20cc Big Twin push rods suggest 4-cycle 19 Graup ner Robin Sport Scale Glider Tow 20 Bauer Models Habicht scale aerobatic sailplane ARTF costing some $200 21 Big scale Wolfgang Rodel includes 7-ft Cub 6-ft Turbo Trainer 7-ft Flamingo shown Note scale subjects Almost newies sheer elegance modeled 11-ft semi-scale 19s Sitar Bros influence high-speed slope flying evident sharp Flamingo Multi plex Carreras Sagitta actual rec ord holder Microprop stand pro mote Brand RC Continued page 91 after full-size Graupners near-12-ft Mini Nimbus classic span foam wings built-up variant shorter 9 heres real deal flies best rudder spoilers sales people say Other scale types take eye Bauers DES Habicht gull-wing vintage open-cockpit aero batic Multiplexs ASW 20 Wanit scheks superb pair 12-ft P1K 20 14-ft Jantar 2 theres sailplane field Robbe taken Pol ish power-assist two-seater Ogar has 38 Model Aviation lined up mechanical line force remove tendency blade change pitch working would advantageous especially thin blades used Another design consideration preces sion no confused preces sion force created through gyroscopic action prop rotation Precession simply moving ahead point thrust would normally applied blade propeller arc normal blade shapes center line thrust coin cides line passes through center engine shaft looking front shaft top view pro peller blade center line rota tion blade angles created center As blade moves through arc rotation con sidered line along thrust generated Pitch also measured line center line thrust can moved ahead center line rotation effective angle blade arc rotation will increased changing physical angle advantage precession crease pitch adding drag Drag created physical angle blades precession change physical angle effective change pitch can used advantage air craft requires 7 pitch terminal ve locity precession prop pitch can 6 example will still have effective pitch 7 lower drag 6/4 physical pitch plus factor combined lower drag will allow engine rpm power drawback precession moves center line thrust away line mechanical force torsional rotation force created possible rigid blades torsional rotation force could disregarded taking advan tage precession instead stan dard prop shape precession added shown diagram No 4 Diagrams No 5 6 show design factors can incorporated blade shape Before finalizing ideas may wish try custom made props type blade airfoil should considered considerations blade airfoil same wing wish greatest lift possible least amount dragthe old L/D ratio again Secondly air speed should con sidered Formula propeller stance average blade air speed about 350 mph tip speed ap proaching sonic range An airfoil de veloped speed ranges would efficient modern airfoils have excellent lift-drag ratio far less drag older styles amount drag reduced serious loss lift result same adding horse power part II will show can transform thse ideas actual props own workshop Additionally will explain test tailor particular needs Nurnberg/Moulton continued page 38 Just gliders mostly scale eyccatching power kits after seeing Katos 20 & 40 versions Prettners Curare host electrics ranging Aeronauts BD-5 Udet Flamingo Graupners Elektra-fly Elektro-Max Queen show scribe undoubtedly 8-ft Svenson Storch 60s Its big rugged functional intended fly STOL lots power big prop fine pitch Fixed slats power ful flaps tail feathers plus longstroke landing gear rest won der no German firm did firstSven son Belgian Cessnas abound Cox RTF Carreras plastic Wichita replicas cater constant demand Graupner has gone Jodel Robin DR400 big way brochures say itll take new OS 90 especially used tow sailplanes Other big scale kits Wolfgang Rodel has MBB 233 Flamingo June1978 91 25cc smaller Suit 40s Also Pilatus PC7 Turbo Trainer 60s Strictly European big lowwings offer lots fuselage room ruggedness suit grass fields None rugged Topps ARTF Class 2 scale line has expanded sleek Mirage 2000 stunning F-18 Cobra has droop snoot leading edges latest camou ouflage looks part model 80s sells around $160 Germany Sport RC also has its share innova tions Another flush trainer kits include several 20 engines trend upheld RC gear itself Last show saw rash super-sophisticated equipment controls would take ace handle year same trend perpetuated yet toned down shade modular concept becomes common place Almost manufacturer now add-a-box state frequency purpose can changed plugging-in another module Multiplex put control mixer Ix way like several other prominent German firms have sunk national pride badge-engineered Japanese imports meet sports market other wise neglecting Thus Futaba Sanwa product review product review product review Whats Angle Measuring rigging angles wings tails thrust lines offset thrust etc. has always irksome task unrealized error could effect flight perfor mance Robarts new incidence meter ends use adjustable notched tops positioned steel bar according type measurement made box containing steel counterweight pre cision pointer dial scale also slides bar required Operation simple using carpenters level Price $1595 Ro bart PO Box 122 Wheaton 1160187 product review product review product review JM 10 etc. have strong grip dont always appear under own name Did someone say What about en gines---helicopters Only Dieter Schlut ers Heli-Boy acrobatic version Bell 222 could claimed new among rotary wings thats sign consolidation Helicopter trainer pads coming solu tion training risk clever never-leave-the-ground device Hel mut Fett Cologne said selling generation garden fliers want no simulate flight risk As engines car boom has fluence has boosted 19 size opposite end big Sueva 25 05 20 Damo 18 cc sizes plus new OS 90 OPS 65 show way trade thinking Only Webra has thought lunior size produced 15 cc 09 theres hardly unit show throttle way stimulate young CL flier free-flight sportster Engine Technique/Jehlik continued page 49 ideal RC applications million words said about fuel systems Im going try summarize few RC aircraft Since fuel system subjected relatively long distances fuel draw vertical climb large varia tions fuel pressure point pickup maneuvers use fuel pumps rec ommended may supplemented servo-controlled needle valve special applications Control Line Although understood Stockton Chicken Hooper concept adaptable CL events result being perfectly constant runs throughout flight am unaware other fuel tank design provides level performance Ill glad answer questions about adaptation hop pers tanks different events Carburetors carburetor acts partial regulator velocity air venturi throat results lowered air pres NEW/ MUFF-L-IT SERIES Available e C engines Sis eight Ob reduction noise engines Proportional nolumne expan sion chamber Large exhaust nozzle low back pressure 4 Little no loss power REGULAR & NO 30109-191749 No 0022940t839 no 30340801949 *nI o B d C y00fl No 304N4 wln 51095 NO305R4294011195 No30km488411395 1/2A MUFFLER Fits COX 049 engInes NO 30080491149 No ODIN0511149 sure provides suction draw fuel carburetor degree needle valve opening will allow much fuel pass given setting get idea variation attach fuel line about 12 long tank adjust en gine tank located carburetor level raise lower tank will observe engine change very rich very lean depending vertical location tank regula tion provided carburetor slight Engines Can tolerate wide range fuel settings Simply put power curve engines relatively flat peak power settings means can generally adjust engine run up 1000 rpm rich peak setting still use nearly maximum power Forces Gravity basic force usu ally smallest force affecting model fuel system G forces maneuvers can approach 40 centrifugal forces CL speed models over 20 times gravity Vibration air stream forces tend cause fuel foam tanks recent approach Dave Gierke places fuel bladder hard tank will eliminate foaming air enters tank outside bladder fuel inside system used Huntsville speed fliers Dick Hall Bob Lauderdale FAI CL speed models early 60s system eliminates Inland Sport eye-catcning classic orom Golden Era VNJith 37% span Herb Clu key-designed parasol scale RC model takes 02 electric 049 power excellent schoolyard flying Decals printed balsa rolled plans proof-of-scale data etc Price $1395 Flyline Models Inc. 2820 Dorr Ave B-2 Fairfax VA 22030 product review product review product review 92 Model Aviation Droduct review product review product review
Edition: Model Aviation - 1978/06
Page Numbers: 34, 35, 36, 37, 38, 91, 92
NURNBERG magnet Euro pean model trade February New exhibition halls gave space 78 somehow scene did excite pulse like before Yet lots new see no slackening attendance personalities hobby world looking prosperous after tough 1977 So should years Interna tional Hobby Fair seem shade off-key 5EI1 EIC 29th International Toy Fair Germany Model First The trend cars immense anyone thing fit crankshaft propeller diversification holds nothing air men Just about everyone ran car section booth thats way RC moving sure Second The new Halls confuse crafts kiddy books like dyed wool model hobby people identifica tion wasnt clear cut enougheven extent some long-established manu facturers took lot hunting down will course cured next time Third There signs running out outstanding ideas Imaginative trendsetters getting scarcer model plane field Now have electrics ducted fans engines CO2 90 sailplanes plastic scale types kind Among noteworthy products show 1 Topps Cobraa real hithad droop leading edge 2 Webras geared-down drive big props standard engines 3 Topps Mir age 2000 pusher delta-winged RC 4 Shark twin C02 Harden Associates 5 Multiplex 20-powered sport/trainer new RC sports trend 6 Robbe scale Ogar Polish powered sailplane glass-fiber fuselage 140-in span 7 Svenson Belgium scale Fieseler Storch 8-ft beauty full STOL abilities Ron Moulton Aviations co pondent reports world-wide trends presents selected highlights June 1978 35 36 Model Aviation fidelity kits theres no space shelves themits time think hard dealer could have spent fortune ordersand still made wrong decisions year unless clear understanding way custom ers going thinking Whos know sailplane going soar greater popularity RC thermal slope soarers topsellers Europe whether stay way pricey sophistication another guess Deutsche Mark 50 cents German prices heading 300-dollar glider money get lot model Like 150-in Ascale Astir Klinger Wik its 1/5scale sister 143-in Twin Astir Car reras big Mistral over 14-ft span SBIO around 17 ft 8 Jerry Nelson Vaclav Horcicka HP discuss Gold Cup engine 9 OPS 15cc Marine 10 Jaures Garofoli Supertigre latest 46 11 HBs Car Special 35 engine AC cars over whelming trend Europe 12 Kato Iits new mini version Prettners Cu rare 13 Sectioned display Webra 91 brute engine power match 14 Multi CO2 units Harden drive big propsup 16 15 Marx Elek tro-Jet has Duoperm 36v 20A motor triple nicads drives 7-5 prop impressive ly Recharge contacts located mock pipes rear 16 HP Gold Cup 61 NO OCR TEXT 17 Swedish Demo 18cc Twin cutaway show interior 18 05 20cc Big Twin push rods suggest 4-cycle 19 Graup ner Robin Sport Scale Glider Tow 20 Bauer Models Habicht scale aerobatic sailplane ARTF costing some $200 21 Big scale Wolfgang Rodel includes 7-ft Cub 6-ft Turbo Trainer 7-ft Flamingo shown Note scale subjects Almost newies sheer elegance modeled 11-ft semi-scale 19s Sitar Bros influence high-speed slope flying evident sharp Flamingo Multi plex Carreras Sagitta actual rec ord holder Microprop stand pro mote Brand RC Continued page 91 after full-size Graupners near-12-ft Mini Nimbus classic span foam wings built-up variant shorter 9 heres real deal flies best rudder spoilers sales people say Other scale types take eye Bauers DES Habicht gull-wing vintage open-cockpit aero batic Multiplexs ASW 20 Wanit scheks superb pair 12-ft P1K 20 14-ft Jantar 2 theres sailplane field Robbe taken Pol ish power-assist two-seater Ogar has 38 Model Aviation lined up mechanical line force remove tendency blade change pitch working would advantageous especially thin blades used Another design consideration preces sion no confused preces sion force created through gyroscopic action prop rotation Precession simply moving ahead point thrust would normally applied blade propeller arc normal blade shapes center line thrust coin cides line passes through center engine shaft looking front shaft top view pro peller blade center line rota tion blade angles created center As blade moves through arc rotation con sidered line along thrust generated Pitch also measured line center line thrust can moved ahead center line rotation effective angle blade arc rotation will increased changing physical angle advantage precession crease pitch adding drag Drag created physical angle blades precession change physical angle effective change pitch can used advantage air craft requires 7 pitch terminal ve locity precession prop pitch can 6 example will still have effective pitch 7 lower drag 6/4 physical pitch plus factor combined lower drag will allow engine rpm power drawback precession moves center line thrust away line mechanical force torsional rotation force created possible rigid blades torsional rotation force could disregarded taking advan tage precession instead stan dard prop shape precession added shown diagram No 4 Diagrams No 5 6 show design factors can incorporated blade shape Before finalizing ideas may wish try custom made props type blade airfoil should considered considerations blade airfoil same wing wish greatest lift possible least amount dragthe old L/D ratio again Secondly air speed should con sidered Formula propeller stance average blade air speed about 350 mph tip speed ap proaching sonic range An airfoil de veloped speed ranges would efficient modern airfoils have excellent lift-drag ratio far less drag older styles amount drag reduced serious loss lift result same adding horse power part II will show can transform thse ideas actual props own workshop Additionally will explain test tailor particular needs Nurnberg/Moulton continued page 38 Just gliders mostly scale eyccatching power kits after seeing Katos 20 & 40 versions Prettners Curare host electrics ranging Aeronauts BD-5 Udet Flamingo Graupners Elektra-fly Elektro-Max Queen show scribe undoubtedly 8-ft Svenson Storch 60s Its big rugged functional intended fly STOL lots power big prop fine pitch Fixed slats power ful flaps tail feathers plus longstroke landing gear rest won der no German firm did firstSven son Belgian Cessnas abound Cox RTF Carreras plastic Wichita replicas cater constant demand Graupner has gone Jodel Robin DR400 big way brochures say itll take new OS 90 especially used tow sailplanes Other big scale kits Wolfgang Rodel has MBB 233 Flamingo June1978 91 25cc smaller Suit 40s Also Pilatus PC7 Turbo Trainer 60s Strictly European big lowwings offer lots fuselage room ruggedness suit grass fields None rugged Topps ARTF Class 2 scale line has expanded sleek Mirage 2000 stunning F-18 Cobra has droop snoot leading edges latest camou ouflage looks part model 80s sells around $160 Germany Sport RC also has its share innova tions Another flush trainer kits include several 20 engines trend upheld RC gear itself Last show saw rash super-sophisticated equipment controls would take ace handle year same trend perpetuated yet toned down shade modular concept becomes common place Almost manufacturer now add-a-box state frequency purpose can changed plugging-in another module Multiplex put control mixer Ix way like several other prominent German firms have sunk national pride badge-engineered Japanese imports meet sports market other wise neglecting Thus Futaba Sanwa product review product review product review Whats Angle Measuring rigging angles wings tails thrust lines offset thrust etc. has always irksome task unrealized error could effect flight perfor mance Robarts new incidence meter ends use adjustable notched tops positioned steel bar according type measurement made box containing steel counterweight pre cision pointer dial scale also slides bar required Operation simple using carpenters level Price $1595 Ro bart PO Box 122 Wheaton 1160187 product review product review product review JM 10 etc. have strong grip dont always appear under own name Did someone say What about en gines---helicopters Only Dieter Schlut ers Heli-Boy acrobatic version Bell 222 could claimed new among rotary wings thats sign consolidation Helicopter trainer pads coming solu tion training risk clever never-leave-the-ground device Hel mut Fett Cologne said selling generation garden fliers want no simulate flight risk As engines car boom has fluence has boosted 19 size opposite end big Sueva 25 05 20 Damo 18 cc sizes plus new OS 90 OPS 65 show way trade thinking Only Webra has thought lunior size produced 15 cc 09 theres hardly unit show throttle way stimulate young CL flier free-flight sportster Engine Technique/Jehlik continued page 49 ideal RC applications million words said about fuel systems Im going try summarize few RC aircraft Since fuel system subjected relatively long distances fuel draw vertical climb large varia tions fuel pressure point pickup maneuvers use fuel pumps rec ommended may supplemented servo-controlled needle valve special applications Control Line Although understood Stockton Chicken Hooper concept adaptable CL events result being perfectly constant runs throughout flight am unaware other fuel tank design provides level performance Ill glad answer questions about adaptation hop pers tanks different events Carburetors carburetor acts partial regulator velocity air venturi throat results lowered air pres NEW/ MUFF-L-IT SERIES Available e C engines Sis eight Ob reduction noise engines Proportional nolumne expan sion chamber Large exhaust nozzle low back pressure 4 Little no loss power REGULAR & NO 30109-191749 No 0022940t839 no 30340801949 *nI o B d C y00fl No 304N4 wln 51095 NO305R4294011195 No30km488411395 1/2A MUFFLER Fits COX 049 engInes NO 30080491149 No ODIN0511149 sure provides suction draw fuel carburetor degree needle valve opening will allow much fuel pass given setting get idea variation attach fuel line about 12 long tank adjust en gine tank located carburetor level raise lower tank will observe engine change very rich very lean depending vertical location tank regula tion provided carburetor slight Engines Can tolerate wide range fuel settings Simply put power curve engines relatively flat peak power settings means can generally adjust engine run up 1000 rpm rich peak setting still use nearly maximum power Forces Gravity basic force usu ally smallest force affecting model fuel system G forces maneuvers can approach 40 centrifugal forces CL speed models over 20 times gravity Vibration air stream forces tend cause fuel foam tanks recent approach Dave Gierke places fuel bladder hard tank will eliminate foaming air enters tank outside bladder fuel inside system used Huntsville speed fliers Dick Hall Bob Lauderdale FAI CL speed models early 60s system eliminates Inland Sport eye-catcning classic orom Golden Era VNJith 37% span Herb Clu key-designed parasol scale RC model takes 02 electric 049 power excellent schoolyard flying Decals printed balsa rolled plans proof-of-scale data etc Price $1395 Flyline Models Inc. 2820 Dorr Ave B-2 Fairfax VA 22030 product review product review product review 92 Model Aviation Droduct review product review product review
Edition: Model Aviation - 1978/06
Page Numbers: 34, 35, 36, 37, 38, 91, 92
NURNBERG magnet Euro pean model trade February New exhibition halls gave space 78 somehow scene did excite pulse like before Yet lots new see no slackening attendance personalities hobby world looking prosperous after tough 1977 So should years Interna tional Hobby Fair seem shade off-key 5EI1 EIC 29th International Toy Fair Germany Model First The trend cars immense anyone thing fit crankshaft propeller diversification holds nothing air men Just about everyone ran car section booth thats way RC moving sure Second The new Halls confuse crafts kiddy books like dyed wool model hobby people identifica tion wasnt clear cut enougheven extent some long-established manu facturers took lot hunting down will course cured next time Third There signs running out outstanding ideas Imaginative trendsetters getting scarcer model plane field Now have electrics ducted fans engines CO2 90 sailplanes plastic scale types kind Among noteworthy products show 1 Topps Cobraa real hithad droop leading edge 2 Webras geared-down drive big props standard engines 3 Topps Mir age 2000 pusher delta-winged RC 4 Shark twin C02 Harden Associates 5 Multiplex 20-powered sport/trainer new RC sports trend 6 Robbe scale Ogar Polish powered sailplane glass-fiber fuselage 140-in span 7 Svenson Belgium scale Fieseler Storch 8-ft beauty full STOL abilities Ron Moulton Aviations co pondent reports world-wide trends presents selected highlights June 1978 35 36 Model Aviation fidelity kits theres no space shelves themits time think hard dealer could have spent fortune ordersand still made wrong decisions year unless clear understanding way custom ers going thinking Whos know sailplane going soar greater popularity RC thermal slope soarers topsellers Europe whether stay way pricey sophistication another guess Deutsche Mark 50 cents German prices heading 300-dollar glider money get lot model Like 150-in Ascale Astir Klinger Wik its 1/5scale sister 143-in Twin Astir Car reras big Mistral over 14-ft span SBIO around 17 ft 8 Jerry Nelson Vaclav Horcicka HP discuss Gold Cup engine 9 OPS 15cc Marine 10 Jaures Garofoli Supertigre latest 46 11 HBs Car Special 35 engine AC cars over whelming trend Europe 12 Kato Iits new mini version Prettners Cu rare 13 Sectioned display Webra 91 brute engine power match 14 Multi CO2 units Harden drive big propsup 16 15 Marx Elek tro-Jet has Duoperm 36v 20A motor triple nicads drives 7-5 prop impressive ly Recharge contacts located mock pipes rear 16 HP Gold Cup 61 NO OCR TEXT 17 Swedish Demo 18cc Twin cutaway show interior 18 05 20cc Big Twin push rods suggest 4-cycle 19 Graup ner Robin Sport Scale Glider Tow 20 Bauer Models Habicht scale aerobatic sailplane ARTF costing some $200 21 Big scale Wolfgang Rodel includes 7-ft Cub 6-ft Turbo Trainer 7-ft Flamingo shown Note scale subjects Almost newies sheer elegance modeled 11-ft semi-scale 19s Sitar Bros influence high-speed slope flying evident sharp Flamingo Multi plex Carreras Sagitta actual rec ord holder Microprop stand pro mote Brand RC Continued page 91 after full-size Graupners near-12-ft Mini Nimbus classic span foam wings built-up variant shorter 9 heres real deal flies best rudder spoilers sales people say Other scale types take eye Bauers DES Habicht gull-wing vintage open-cockpit aero batic Multiplexs ASW 20 Wanit scheks superb pair 12-ft P1K 20 14-ft Jantar 2 theres sailplane field Robbe taken Pol ish power-assist two-seater Ogar has 38 Model Aviation lined up mechanical line force remove tendency blade change pitch working would advantageous especially thin blades used Another design consideration preces sion no confused preces sion force created through gyroscopic action prop rotation Precession simply moving ahead point thrust would normally applied blade propeller arc normal blade shapes center line thrust coin cides line passes through center engine shaft looking front shaft top view pro peller blade center line rota tion blade angles created center As blade moves through arc rotation con sidered line along thrust generated Pitch also measured line center line thrust can moved ahead center line rotation effective angle blade arc rotation will increased changing physical angle advantage precession crease pitch adding drag Drag created physical angle blades precession change physical angle effective change pitch can used advantage air craft requires 7 pitch terminal ve locity precession prop pitch can 6 example will still have effective pitch 7 lower drag 6/4 physical pitch plus factor combined lower drag will allow engine rpm power drawback precession moves center line thrust away line mechanical force torsional rotation force created possible rigid blades torsional rotation force could disregarded taking advan tage precession instead stan dard prop shape precession added shown diagram No 4 Diagrams No 5 6 show design factors can incorporated blade shape Before finalizing ideas may wish try custom made props type blade airfoil should considered considerations blade airfoil same wing wish greatest lift possible least amount dragthe old L/D ratio again Secondly air speed should con sidered Formula propeller stance average blade air speed about 350 mph tip speed ap proaching sonic range An airfoil de veloped speed ranges would efficient modern airfoils have excellent lift-drag ratio far less drag older styles amount drag reduced serious loss lift result same adding horse power part II will show can transform thse ideas actual props own workshop Additionally will explain test tailor particular needs Nurnberg/Moulton continued page 38 Just gliders mostly scale eyccatching power kits after seeing Katos 20 & 40 versions Prettners Curare host electrics ranging Aeronauts BD-5 Udet Flamingo Graupners Elektra-fly Elektro-Max Queen show scribe undoubtedly 8-ft Svenson Storch 60s Its big rugged functional intended fly STOL lots power big prop fine pitch Fixed slats power ful flaps tail feathers plus longstroke landing gear rest won der no German firm did firstSven son Belgian Cessnas abound Cox RTF Carreras plastic Wichita replicas cater constant demand Graupner has gone Jodel Robin DR400 big way brochures say itll take new OS 90 especially used tow sailplanes Other big scale kits Wolfgang Rodel has MBB 233 Flamingo June1978 91 25cc smaller Suit 40s Also Pilatus PC7 Turbo Trainer 60s Strictly European big lowwings offer lots fuselage room ruggedness suit grass fields None rugged Topps ARTF Class 2 scale line has expanded sleek Mirage 2000 stunning F-18 Cobra has droop snoot leading edges latest camou ouflage looks part model 80s sells around $160 Germany Sport RC also has its share innova tions Another flush trainer kits include several 20 engines trend upheld RC gear itself Last show saw rash super-sophisticated equipment controls would take ace handle year same trend perpetuated yet toned down shade modular concept becomes common place Almost manufacturer now add-a-box state frequency purpose can changed plugging-in another module Multiplex put control mixer Ix way like several other prominent German firms have sunk national pride badge-engineered Japanese imports meet sports market other wise neglecting Thus Futaba Sanwa product review product review product review Whats Angle Measuring rigging angles wings tails thrust lines offset thrust etc. has always irksome task unrealized error could effect flight perfor mance Robarts new incidence meter ends use adjustable notched tops positioned steel bar according type measurement made box containing steel counterweight pre cision pointer dial scale also slides bar required Operation simple using carpenters level Price $1595 Ro bart PO Box 122 Wheaton 1160187 product review product review product review JM 10 etc. have strong grip dont always appear under own name Did someone say What about en gines---helicopters Only Dieter Schlut ers Heli-Boy acrobatic version Bell 222 could claimed new among rotary wings thats sign consolidation Helicopter trainer pads coming solu tion training risk clever never-leave-the-ground device Hel mut Fett Cologne said selling generation garden fliers want no simulate flight risk As engines car boom has fluence has boosted 19 size opposite end big Sueva 25 05 20 Damo 18 cc sizes plus new OS 90 OPS 65 show way trade thinking Only Webra has thought lunior size produced 15 cc 09 theres hardly unit show throttle way stimulate young CL flier free-flight sportster Engine Technique/Jehlik continued page 49 ideal RC applications million words said about fuel systems Im going try summarize few RC aircraft Since fuel system subjected relatively long distances fuel draw vertical climb large varia tions fuel pressure point pickup maneuvers use fuel pumps rec ommended may supplemented servo-controlled needle valve special applications Control Line Although understood Stockton Chicken Hooper concept adaptable CL events result being perfectly constant runs throughout flight am unaware other fuel tank design provides level performance Ill glad answer questions about adaptation hop pers tanks different events Carburetors carburetor acts partial regulator velocity air venturi throat results lowered air pres NEW/ MUFF-L-IT SERIES Available e C engines Sis eight Ob reduction noise engines Proportional nolumne expan sion chamber Large exhaust nozzle low back pressure 4 Little no loss power REGULAR & NO 30109-191749 No 0022940t839 no 30340801949 *nI o B d C y00fl No 304N4 wln 51095 NO305R4294011195 No30km488411395 1/2A MUFFLER Fits COX 049 engInes NO 30080491149 No ODIN0511149 sure provides suction draw fuel carburetor degree needle valve opening will allow much fuel pass given setting get idea variation attach fuel line about 12 long tank adjust en gine tank located carburetor level raise lower tank will observe engine change very rich very lean depending vertical location tank regula tion provided carburetor slight Engines Can tolerate wide range fuel settings Simply put power curve engines relatively flat peak power settings means can generally adjust engine run up 1000 rpm rich peak setting still use nearly maximum power Forces Gravity basic force usu ally smallest force affecting model fuel system G forces maneuvers can approach 40 centrifugal forces CL speed models over 20 times gravity Vibration air stream forces tend cause fuel foam tanks recent approach Dave Gierke places fuel bladder hard tank will eliminate foaming air enters tank outside bladder fuel inside system used Huntsville speed fliers Dick Hall Bob Lauderdale FAI CL speed models early 60s system eliminates Inland Sport eye-catcning classic orom Golden Era VNJith 37% span Herb Clu key-designed parasol scale RC model takes 02 electric 049 power excellent schoolyard flying Decals printed balsa rolled plans proof-of-scale data etc Price $1395 Flyline Models Inc. 2820 Dorr Ave B-2 Fairfax VA 22030 product review product review product review 92 Model Aviation Droduct review product review product review
Edition: Model Aviation - 1978/06
Page Numbers: 34, 35, 36, 37, 38, 91, 92
NURNBERG magnet Euro pean model trade February New exhibition halls gave space 78 somehow scene did excite pulse like before Yet lots new see no slackening attendance personalities hobby world looking prosperous after tough 1977 So should years Interna tional Hobby Fair seem shade off-key 5EI1 EIC 29th International Toy Fair Germany Model First The trend cars immense anyone thing fit crankshaft propeller diversification holds nothing air men Just about everyone ran car section booth thats way RC moving sure Second The new Halls confuse crafts kiddy books like dyed wool model hobby people identifica tion wasnt clear cut enougheven extent some long-established manu facturers took lot hunting down will course cured next time Third There signs running out outstanding ideas Imaginative trendsetters getting scarcer model plane field Now have electrics ducted fans engines CO2 90 sailplanes plastic scale types kind Among noteworthy products show 1 Topps Cobraa real hithad droop leading edge 2 Webras geared-down drive big props standard engines 3 Topps Mir age 2000 pusher delta-winged RC 4 Shark twin C02 Harden Associates 5 Multiplex 20-powered sport/trainer new RC sports trend 6 Robbe scale Ogar Polish powered sailplane glass-fiber fuselage 140-in span 7 Svenson Belgium scale Fieseler Storch 8-ft beauty full STOL abilities Ron Moulton Aviations co pondent reports world-wide trends presents selected highlights June 1978 35 36 Model Aviation fidelity kits theres no space shelves themits time think hard dealer could have spent fortune ordersand still made wrong decisions year unless clear understanding way custom ers going thinking Whos know sailplane going soar greater popularity RC thermal slope soarers topsellers Europe whether stay way pricey sophistication another guess Deutsche Mark 50 cents German prices heading 300-dollar glider money get lot model Like 150-in Ascale Astir Klinger Wik its 1/5scale sister 143-in Twin Astir Car reras big Mistral over 14-ft span SBIO around 17 ft 8 Jerry Nelson Vaclav Horcicka HP discuss Gold Cup engine 9 OPS 15cc Marine 10 Jaures Garofoli Supertigre latest 46 11 HBs Car Special 35 engine AC cars over whelming trend Europe 12 Kato Iits new mini version Prettners Cu rare 13 Sectioned display Webra 91 brute engine power match 14 Multi CO2 units Harden drive big propsup 16 15 Marx Elek tro-Jet has Duoperm 36v 20A motor triple nicads drives 7-5 prop impressive ly Recharge contacts located mock pipes rear 16 HP Gold Cup 61 NO OCR TEXT 17 Swedish Demo 18cc Twin cutaway show interior 18 05 20cc Big Twin push rods suggest 4-cycle 19 Graup ner Robin Sport Scale Glider Tow 20 Bauer Models Habicht scale aerobatic sailplane ARTF costing some $200 21 Big scale Wolfgang Rodel includes 7-ft Cub 6-ft Turbo Trainer 7-ft Flamingo shown Note scale subjects Almost newies sheer elegance modeled 11-ft semi-scale 19s Sitar Bros influence high-speed slope flying evident sharp Flamingo Multi plex Carreras Sagitta actual rec ord holder Microprop stand pro mote Brand RC Continued page 91 after full-size Graupners near-12-ft Mini Nimbus classic span foam wings built-up variant shorter 9 heres real deal flies best rudder spoilers sales people say Other scale types take eye Bauers DES Habicht gull-wing vintage open-cockpit aero batic Multiplexs ASW 20 Wanit scheks superb pair 12-ft P1K 20 14-ft Jantar 2 theres sailplane field Robbe taken Pol ish power-assist two-seater Ogar has 38 Model Aviation lined up mechanical line force remove tendency blade change pitch working would advantageous especially thin blades used Another design consideration preces sion no confused preces sion force created through gyroscopic action prop rotation Precession simply moving ahead point thrust would normally applied blade propeller arc normal blade shapes center line thrust coin cides line passes through center engine shaft looking front shaft top view pro peller blade center line rota tion blade angles created center As blade moves through arc rotation con sidered line along thrust generated Pitch also measured line center line thrust can moved ahead center line rotation effective angle blade arc rotation will increased changing physical angle advantage precession crease pitch adding drag Drag created physical angle blades precession change physical angle effective change pitch can used advantage air craft requires 7 pitch terminal ve locity precession prop pitch can 6 example will still have effective pitch 7 lower drag 6/4 physical pitch plus factor combined lower drag will allow engine rpm power drawback precession moves center line thrust away line mechanical force torsional rotation force created possible rigid blades torsional rotation force could disregarded taking advan tage precession instead stan dard prop shape precession added shown diagram No 4 Diagrams No 5 6 show design factors can incorporated blade shape Before finalizing ideas may wish try custom made props type blade airfoil should considered considerations blade airfoil same wing wish greatest lift possible least amount dragthe old L/D ratio again Secondly air speed should con sidered Formula propeller stance average blade air speed about 350 mph tip speed ap proaching sonic range An airfoil de veloped speed ranges would efficient modern airfoils have excellent lift-drag ratio far less drag older styles amount drag reduced serious loss lift result same adding horse power part II will show can transform thse ideas actual props own workshop Additionally will explain test tailor particular needs Nurnberg/Moulton continued page 38 Just gliders mostly scale eyccatching power kits after seeing Katos 20 & 40 versions Prettners Curare host electrics ranging Aeronauts BD-5 Udet Flamingo Graupners Elektra-fly Elektro-Max Queen show scribe undoubtedly 8-ft Svenson Storch 60s Its big rugged functional intended fly STOL lots power big prop fine pitch Fixed slats power ful flaps tail feathers plus longstroke landing gear rest won der no German firm did firstSven son Belgian Cessnas abound Cox RTF Carreras plastic Wichita replicas cater constant demand Graupner has gone Jodel Robin DR400 big way brochures say itll take new OS 90 especially used tow sailplanes Other big scale kits Wolfgang Rodel has MBB 233 Flamingo June1978 91 25cc smaller Suit 40s Also Pilatus PC7 Turbo Trainer 60s Strictly European big lowwings offer lots fuselage room ruggedness suit grass fields None rugged Topps ARTF Class 2 scale line has expanded sleek Mirage 2000 stunning F-18 Cobra has droop snoot leading edges latest camou ouflage looks part model 80s sells around $160 Germany Sport RC also has its share innova tions Another flush trainer kits include several 20 engines trend upheld RC gear itself Last show saw rash super-sophisticated equipment controls would take ace handle year same trend perpetuated yet toned down shade modular concept becomes common place Almost manufacturer now add-a-box state frequency purpose can changed plugging-in another module Multiplex put control mixer Ix way like several other prominent German firms have sunk national pride badge-engineered Japanese imports meet sports market other wise neglecting Thus Futaba Sanwa product review product review product review Whats Angle Measuring rigging angles wings tails thrust lines offset thrust etc. has always irksome task unrealized error could effect flight perfor mance Robarts new incidence meter ends use adjustable notched tops positioned steel bar according type measurement made box containing steel counterweight pre cision pointer dial scale also slides bar required Operation simple using carpenters level Price $1595 Ro bart PO Box 122 Wheaton 1160187 product review product review product review JM 10 etc. have strong grip dont always appear under own name Did someone say What about en gines---helicopters Only Dieter Schlut ers Heli-Boy acrobatic version Bell 222 could claimed new among rotary wings thats sign consolidation Helicopter trainer pads coming solu tion training risk clever never-leave-the-ground device Hel mut Fett Cologne said selling generation garden fliers want no simulate flight risk As engines car boom has fluence has boosted 19 size opposite end big Sueva 25 05 20 Damo 18 cc sizes plus new OS 90 OPS 65 show way trade thinking Only Webra has thought lunior size produced 15 cc 09 theres hardly unit show throttle way stimulate young CL flier free-flight sportster Engine Technique/Jehlik continued page 49 ideal RC applications million words said about fuel systems Im going try summarize few RC aircraft Since fuel system subjected relatively long distances fuel draw vertical climb large varia tions fuel pressure point pickup maneuvers use fuel pumps rec ommended may supplemented servo-controlled needle valve special applications Control Line Although understood Stockton Chicken Hooper concept adaptable CL events result being perfectly constant runs throughout flight am unaware other fuel tank design provides level performance Ill glad answer questions about adaptation hop pers tanks different events Carburetors carburetor acts partial regulator velocity air venturi throat results lowered air pres NEW/ MUFF-L-IT SERIES Available e C engines Sis eight Ob reduction noise engines Proportional nolumne expan sion chamber Large exhaust nozzle low back pressure 4 Little no loss power REGULAR & NO 30109-191749 No 0022940t839 no 30340801949 *nI o B d C y00fl No 304N4 wln 51095 NO305R4294011195 No30km488411395 1/2A MUFFLER Fits COX 049 engInes NO 30080491149 No ODIN0511149 sure provides suction draw fuel carburetor degree needle valve opening will allow much fuel pass given setting get idea variation attach fuel line about 12 long tank adjust en gine tank located carburetor level raise lower tank will observe engine change very rich very lean depending vertical location tank regula tion provided carburetor slight Engines Can tolerate wide range fuel settings Simply put power curve engines relatively flat peak power settings means can generally adjust engine run up 1000 rpm rich peak setting still use nearly maximum power Forces Gravity basic force usu ally smallest force affecting model fuel system G forces maneuvers can approach 40 centrifugal forces CL speed models over 20 times gravity Vibration air stream forces tend cause fuel foam tanks recent approach Dave Gierke places fuel bladder hard tank will eliminate foaming air enters tank outside bladder fuel inside system used Huntsville speed fliers Dick Hall Bob Lauderdale FAI CL speed models early 60s system eliminates Inland Sport eye-catcning classic orom Golden Era VNJith 37% span Herb Clu key-designed parasol scale RC model takes 02 electric 049 power excellent schoolyard flying Decals printed balsa rolled plans proof-of-scale data etc Price $1395 Flyline Models Inc. 2820 Dorr Ave B-2 Fairfax VA 22030 product review product review product review 92 Model Aviation Droduct review product review product review
Edition: Model Aviation - 1978/06
Page Numbers: 34, 35, 36, 37, 38, 91, 92
NURNBERG magnet Euro pean model trade February New exhibition halls gave space 78 somehow scene did excite pulse like before Yet lots new see no slackening attendance personalities hobby world looking prosperous after tough 1977 So should years Interna tional Hobby Fair seem shade off-key 5EI1 EIC 29th International Toy Fair Germany Model First The trend cars immense anyone thing fit crankshaft propeller diversification holds nothing air men Just about everyone ran car section booth thats way RC moving sure Second The new Halls confuse crafts kiddy books like dyed wool model hobby people identifica tion wasnt clear cut enougheven extent some long-established manu facturers took lot hunting down will course cured next time Third There signs running out outstanding ideas Imaginative trendsetters getting scarcer model plane field Now have electrics ducted fans engines CO2 90 sailplanes plastic scale types kind Among noteworthy products show 1 Topps Cobraa real hithad droop leading edge 2 Webras geared-down drive big props standard engines 3 Topps Mir age 2000 pusher delta-winged RC 4 Shark twin C02 Harden Associates 5 Multiplex 20-powered sport/trainer new RC sports trend 6 Robbe scale Ogar Polish powered sailplane glass-fiber fuselage 140-in span 7 Svenson Belgium scale Fieseler Storch 8-ft beauty full STOL abilities Ron Moulton Aviations co pondent reports world-wide trends presents selected highlights June 1978 35 36 Model Aviation fidelity kits theres no space shelves themits time think hard dealer could have spent fortune ordersand still made wrong decisions year unless clear understanding way custom ers going thinking Whos know sailplane going soar greater popularity RC thermal slope soarers topsellers Europe whether stay way pricey sophistication another guess Deutsche Mark 50 cents German prices heading 300-dollar glider money get lot model Like 150-in Ascale Astir Klinger Wik its 1/5scale sister 143-in Twin Astir Car reras big Mistral over 14-ft span SBIO around 17 ft 8 Jerry Nelson Vaclav Horcicka HP discuss Gold Cup engine 9 OPS 15cc Marine 10 Jaures Garofoli Supertigre latest 46 11 HBs Car Special 35 engine AC cars over whelming trend Europe 12 Kato Iits new mini version Prettners Cu rare 13 Sectioned display Webra 91 brute engine power match 14 Multi CO2 units Harden drive big propsup 16 15 Marx Elek tro-Jet has Duoperm 36v 20A motor triple nicads drives 7-5 prop impressive ly Recharge contacts located mock pipes rear 16 HP Gold Cup 61 NO OCR TEXT 17 Swedish Demo 18cc Twin cutaway show interior 18 05 20cc Big Twin push rods suggest 4-cycle 19 Graup ner Robin Sport Scale Glider Tow 20 Bauer Models Habicht scale aerobatic sailplane ARTF costing some $200 21 Big scale Wolfgang Rodel includes 7-ft Cub 6-ft Turbo Trainer 7-ft Flamingo shown Note scale subjects Almost newies sheer elegance modeled 11-ft semi-scale 19s Sitar Bros influence high-speed slope flying evident sharp Flamingo Multi plex Carreras Sagitta actual rec ord holder Microprop stand pro mote Brand RC Continued page 91 after full-size Graupners near-12-ft Mini Nimbus classic span foam wings built-up variant shorter 9 heres real deal flies best rudder spoilers sales people say Other scale types take eye Bauers DES Habicht gull-wing vintage open-cockpit aero batic Multiplexs ASW 20 Wanit scheks superb pair 12-ft P1K 20 14-ft Jantar 2 theres sailplane field Robbe taken Pol ish power-assist two-seater Ogar has 38 Model Aviation lined up mechanical line force remove tendency blade change pitch working would advantageous especially thin blades used Another design consideration preces sion no confused preces sion force created through gyroscopic action prop rotation Precession simply moving ahead point thrust would normally applied blade propeller arc normal blade shapes center line thrust coin cides line passes through center engine shaft looking front shaft top view pro peller blade center line rota tion blade angles created center As blade moves through arc rotation con sidered line along thrust generated Pitch also measured line center line thrust can moved ahead center line rotation effective angle blade arc rotation will increased changing physical angle advantage precession crease pitch adding drag Drag created physical angle blades precession change physical angle effective change pitch can used advantage air craft requires 7 pitch terminal ve locity precession prop pitch can 6 example will still have effective pitch 7 lower drag 6/4 physical pitch plus factor combined lower drag will allow engine rpm power drawback precession moves center line thrust away line mechanical force torsional rotation force created possible rigid blades torsional rotation force could disregarded taking advan tage precession instead stan dard prop shape precession added shown diagram No 4 Diagrams No 5 6 show design factors can incorporated blade shape Before finalizing ideas may wish try custom made props type blade airfoil should considered considerations blade airfoil same wing wish greatest lift possible least amount dragthe old L/D ratio again Secondly air speed should con sidered Formula propeller stance average blade air speed about 350 mph tip speed ap proaching sonic range An airfoil de veloped speed ranges would efficient modern airfoils have excellent lift-drag ratio far less drag older styles amount drag reduced serious loss lift result same adding horse power part II will show can transform thse ideas actual props own workshop Additionally will explain test tailor particular needs Nurnberg/Moulton continued page 38 Just gliders mostly scale eyccatching power kits after seeing Katos 20 & 40 versions Prettners Curare host electrics ranging Aeronauts BD-5 Udet Flamingo Graupners Elektra-fly Elektro-Max Queen show scribe undoubtedly 8-ft Svenson Storch 60s Its big rugged functional intended fly STOL lots power big prop fine pitch Fixed slats power ful flaps tail feathers plus longstroke landing gear rest won der no German firm did firstSven son Belgian Cessnas abound Cox RTF Carreras plastic Wichita replicas cater constant demand Graupner has gone Jodel Robin DR400 big way brochures say itll take new OS 90 especially used tow sailplanes Other big scale kits Wolfgang Rodel has MBB 233 Flamingo June1978 91 25cc smaller Suit 40s Also Pilatus PC7 Turbo Trainer 60s Strictly European big lowwings offer lots fuselage room ruggedness suit grass fields None rugged Topps ARTF Class 2 scale line has expanded sleek Mirage 2000 stunning F-18 Cobra has droop snoot leading edges latest camou ouflage looks part model 80s sells around $160 Germany Sport RC also has its share innova tions Another flush trainer kits include several 20 engines trend upheld RC gear itself Last show saw rash super-sophisticated equipment controls would take ace handle year same trend perpetuated yet toned down shade modular concept becomes common place Almost manufacturer now add-a-box state frequency purpose can changed plugging-in another module Multiplex put control mixer Ix way like several other prominent German firms have sunk national pride badge-engineered Japanese imports meet sports market other wise neglecting Thus Futaba Sanwa product review product review product review Whats Angle Measuring rigging angles wings tails thrust lines offset thrust etc. has always irksome task unrealized error could effect flight perfor mance Robarts new incidence meter ends use adjustable notched tops positioned steel bar according type measurement made box containing steel counterweight pre cision pointer dial scale also slides bar required Operation simple using carpenters level Price $1595 Ro bart PO Box 122 Wheaton 1160187 product review product review product review JM 10 etc. have strong grip dont always appear under own name Did someone say What about en gines---helicopters Only Dieter Schlut ers Heli-Boy acrobatic version Bell 222 could claimed new among rotary wings thats sign consolidation Helicopter trainer pads coming solu tion training risk clever never-leave-the-ground device Hel mut Fett Cologne said selling generation garden fliers want no simulate flight risk As engines car boom has fluence has boosted 19 size opposite end big Sueva 25 05 20 Damo 18 cc sizes plus new OS 90 OPS 65 show way trade thinking Only Webra has thought lunior size produced 15 cc 09 theres hardly unit show throttle way stimulate young CL flier free-flight sportster Engine Technique/Jehlik continued page 49 ideal RC applications million words said about fuel systems Im going try summarize few RC aircraft Since fuel system subjected relatively long distances fuel draw vertical climb large varia tions fuel pressure point pickup maneuvers use fuel pumps rec ommended may supplemented servo-controlled needle valve special applications Control Line Although understood Stockton Chicken Hooper concept adaptable CL events result being perfectly constant runs throughout flight am unaware other fuel tank design provides level performance Ill glad answer questions about adaptation hop pers tanks different events Carburetors carburetor acts partial regulator velocity air venturi throat results lowered air pres NEW/ MUFF-L-IT SERIES Available e C engines Sis eight Ob reduction noise engines Proportional nolumne expan sion chamber Large exhaust nozzle low back pressure 4 Little no loss power REGULAR & NO 30109-191749 No 0022940t839 no 30340801949 *nI o B d C y00fl No 304N4 wln 51095 NO305R4294011195 No30km488411395 1/2A MUFFLER Fits COX 049 engInes NO 30080491149 No ODIN0511149 sure provides suction draw fuel carburetor degree needle valve opening will allow much fuel pass given setting get idea variation attach fuel line about 12 long tank adjust en gine tank located carburetor level raise lower tank will observe engine change very rich very lean depending vertical location tank regula tion provided carburetor slight Engines Can tolerate wide range fuel settings Simply put power curve engines relatively flat peak power settings means can generally adjust engine run up 1000 rpm rich peak setting still use nearly maximum power Forces Gravity basic force usu ally smallest force affecting model fuel system G forces maneuvers can approach 40 centrifugal forces CL speed models over 20 times gravity Vibration air stream forces tend cause fuel foam tanks recent approach Dave Gierke places fuel bladder hard tank will eliminate foaming air enters tank outside bladder fuel inside system used Huntsville speed fliers Dick Hall Bob Lauderdale FAI CL speed models early 60s system eliminates Inland Sport eye-catcning classic orom Golden Era VNJith 37% span Herb Clu key-designed parasol scale RC model takes 02 electric 049 power excellent schoolyard flying Decals printed balsa rolled plans proof-of-scale data etc Price $1395 Flyline Models Inc. 2820 Dorr Ave B-2 Fairfax VA 22030 product review product review product review 92 Model Aviation Droduct review product review product review