Send Dick Perry correct identification plane address head co lumn might win years free membership Navy Carrier Society DISCUSSIONS months column will fea ture advantages control systems other usual three-line system use models qualify bonus points usual Mystery Plane contest Mystery Plane April issue pro totype Fairey Barracuda aircraft designed 1937 specification 5 24/37 carrier-based torpedo dive bomber replace ment Fairey Albacore production Barracudas characterized having horizontal tailplane set high vertical stabilizer much conventional placement horizontal tail first proto type aircraft did work well because buffet ing caused large Fairey-Youngman flaps flaps hung below trailing edge wing did retract later Fairey aircraft could deflected upward 300 position served very effective dive brakes Unfortunately also created turbu lence caused unacceptable buffeting until tail moved higher position production variants John OHara sent photo model prototype Barracuda built Tom Schaefer several years ago model too successful its original configuration two-line control system pen-bladder fuel tank tuned pipe etc fast though best top speed 142 seconds 1268 mph John OHara correctly identified prototype Barracuda selected winner April contest winner February contest Frank Beatty Frank has correctly iden Ionn noiiioy siuw sni ivutriin AM-i Mauler Class 1983 Nats Two-line control system used electronic inrottie control wicrn 5 insulated electrical-type wires feed RC-type decoder drives standard RC servo control box L electronic throt tle control contains RC-type encoder potentiometer attached knob controlling engine speed battery power encoder wire lead plugs insulated control handle Control impulses travel down insulated control lines model June 1988 65 Cono Line Navy Carrier Dick Perry 10035 Deadwood AvL Ellsworth AFB SD 57706 Aprus mystery Plane first prototype Fairey Barracuda flown Britains Royal Navy during after WW II model built Tom Schaefer Class Carrier com petition Wingspan 31 theres 145 sq area Photo John OHara tifying Mystery Planes long have both feature column Congratulations to Continued page 149 0 cf b 0 000 PLENTY OF FREE PARKING Yc C // IA \3/ FAIIIOROUNDS NI * VIMONIUM NO40 N BALTIMORE ~S MARC SHOW MID ATLANTIC RADIO CONTROL JUNE 4 5 1988 Saturday- 9am 5pm Sunday- 10am 4pm MARYLAND STATE FAIR GROUNDS TIMONIUM MARYLAND Sponsored ThE RADK CONTROL MODELERS OF BALilMORE SWAP SHOP $10 FULL TABLE PER DAY $5 E PER DAY NO DEALERS PLEASE Pre-Registration CALL WAYNE MELLOR 301-788-3742 evenings FOR IrIFORMAflOlI COIflACF MARC DIRECTORS DAN YARCHIN & JOHN KIRK 912 Cromwell Bridge Road Towsori MD 21204 301655-0220 301825-8138 packed people bunch people using external controls fuel systems Id like point out few things have come up recently Obviously bladder tank breaks pits may blasted fuel remote chance fire drag external bladder doesnt seem hurt performance too much plane easier build stronger both bellcrank bladder vulnerable impact dam age Since fliers hook lines directly bellcrank much better chance lines being broken using much heavier lead-outs sure inspect line ends often youre used doing seem fray often some reason last column barely hit streets got call Al Kelly offering advice die sel engines Al finds easy work diesels also thinks nothing boring Out Picco 21 making 36 Just flick over says use soft stick whack prop like Racer Tim Gillott Hmmm said Al recommended mixture 35 %-40% ethyl ether 20% oilwhich can mixture cas tor oil mineral oil drugstore Youll also need 2%-3% amyl propyl nitrate rest kerosene ether amyl nitrate may raise eyebrows some folks lo cal chemical supply store because both have uses other model airplane fuels have trouble just show wonderful family-oriented magazine point out infor mation column Al did recommend Davis Diesel conversions sald ABC engines best Fox 36 MK IV would good bet big prop would aid starting beasts Ill bet would also really enhance perform ance Slow Combat model Bonus points Slow mufflers diesels found some real cheap dowels local su permarket work well reinforcing foam wings can put vertically between spars lock place pointed end skewer easily punches through foam just add little glue stuff back through wing cut off flush spar can done field repair after model has covered strengthen lead-out guide area can stick skewers through sip rib foam few inches keep tip flexing steering model important model has lot line rake spars way forward Drilling through engine mount block out 45 0 angle wing another way keep lot rigidity wing little sticks practically free weigh very little add lot strength Spar notches way too big spars Rather pour extra glue try shimming spar us ing medium-weight silkspan Cut piece silkspan about two inches wide youre using % x A-in spars length equal models wingspan Saturate tissue white glue squeegee off excess Put spar middle tissue press spar down foam cores overlapping paper onto foam does tighten up joint bonds spar foam much better Extra layers paper can used over spar add strength can also use small amounts fiberglass cloth things up center section really beef CL Navy Carrier/Perry Continued page 65 As usual will select winner correctly identify months Mystery Plane months winner receives years member ship Navy Carrier Society Nontraditional control systems Bill Boss CL Scale column has number articles about electric electronic control systems CL mo dels January issue provided particularly good summary well addresses inquiring about purchasing electronic control systems Such systems allow two lines provide control multiple functionsa definite advantage Scale models operating features would seem potential advantage Carrier flying well because reduced line drag two lines instead three Ive looked advantages gained using fewer three lines Carrier sim plicity Neither cost Threeline systems cheap easy simple proven available Two-line systems tend An electronic control system also has slight weight penalty model caused necessary bat tery pack decoder servo What advantage potential advantage comes increasing performance reducing line drag analysis performed relied number assumptions simplify process Most assumptions arent critical discussion Ill discuss engineer types curiousContinued page 1S2 June 1988 149 CL Navy Carrier/Perry Continued page 149 significant assumption amount drag caused lines compared drag model itself am aware definitive study evaluate drag three-line control system typical Carrier model model significant variable equation wide range designs makes difficult make definitive assumptions Studies performed some years ago indicate line drag threeline system probably accounts over two-thirds total drag models number probably higher may hard some believe substantiated earlier studies analysis based model perform ance Navy Carrier rules mandate use three-line control systems Profile event discussion limited Class II models Class rules require three 015-in-dia lines two 020-in lines 026-in-dia line class II sizes 018 024 033 re spectively quick look cross-sectional area lines gives idea drag differences Including Reynolds number effects caused changing sizes results numbers approximate 15% reduction line drag going two lines 45% reduction going single line line drag reduced 15% line drag ac counts two-thirds total drag given speed total drag reduction would 10% 10% reduction drag doesnt produce 10% increase speed however Drag changes square speed still isnt answer un less model powered constant-thrust jet engine Because models piston engines essentially constant-power machines perform ance increases related cube speed POWER x VELOCITY bottom line change two lines three will result increase top speed 2% 4% depending model results increase score two points high-drag model capable about 320 points three-line control system about eight points average model capable 380-point flight real advantage comes using monoline system Monoline has potential crease scores 20 points assuming low-speed performance can maintained Unfor tunately fortunately depending point view throttle control monoline system READY TO FLY Call 1-800-45-TO FLY *LOW PRICES *EASY TO ASSEMBLE *NO BUILDING *NO PAINTING Piper Cherokee-40 Piper Cherokee-25 FokkerElll-40 Fancy Stick-25 Cessna 172-20 engine includedl $12999 $10899 $11999 $6999 $10899 Eh SUNSHINE HOBBY 17721 South Western Avenue Gardens California 90247 presents some significant technological hurdles low-speed flight likely slow reliable normal three-line control worth Youll have make own de cision question Non-Scale models Ive received some letters about comments made some months ago about Yak-9 P-Si profile kits suita bility Carrier competition letters have made want discuss issue again Yak-9 prototype doesnt qualify carrierbased aircraft nothing rules prohibits its use Carrier competition Yak9 becomes good Bell Airabonita little mo dification way would recom mend using prototype restrictions made actual carrier takeoffs landings designated carrier aircraft apply bonus points section rules Any model meeting basic specifica tions event can used competition re gardless whether represents qualify ing prototype aircraftit may receive bonus points however Although 100-point bonus Class Class II too significant ignore models have flown effectively Pro file Carrier 10 scale bonus points Laser/Atkisson Continued page 68 F-3 make sure fit together properly Tack glue appropriate scraps onto front engine mounts drill mounting holes install blind nuts dont use engine offset Build jig slip F-2 F-3 place temporarily glue crosspieces maintaining alignment go should become intimate right triangle during phase Raise front fu selage let F-3 fit fully place ensure alignment glue F-i F-2 F-3 place Glue wing mounting blocks A-in stab mounting Align wing drill mounting holes Bolt engine place using incidence meter shim needed make sure engine wing stab zero settings Install flap elevator pushrod leave place Remove wing slide C-i through C-4 place Check alignment straightedge install stringers nose cockpit rear fuselage Sheet ROCKET PLANE xP-1 Only Goes up like rocket Glides down like plane Ready Fly a Wood Crafted THE FLORLO FLYER P37 Johnsonburg Rd 814 834-2586St Marys PA 15857 152 Model Aviation Show Colors BECAUSE WERE PROUD OF THEM take lot pride building model So guess Color paint youre choosing finish take time put paint chip can Perfect Paint color youre buying color want . take guesswork out finishing -0SOSISO Ph 419-797-2208 P0 Box 2480 usky Ohio 44870 6 Modelers U M PChoice - High Quality - Convenient Size st Price Giant Kwik Set Epoxy 16 oz $1395 Gas Model Products 8773 Russet Dr Cincinnati OH 45239 dealer call 513-385-7398 order direct add *150 postage
Edition: Model Aviation - 1988/06
Page Numbers: 65, 149, 152
Send Dick Perry correct identification plane address head co lumn might win years free membership Navy Carrier Society DISCUSSIONS months column will fea ture advantages control systems other usual three-line system use models qualify bonus points usual Mystery Plane contest Mystery Plane April issue pro totype Fairey Barracuda aircraft designed 1937 specification 5 24/37 carrier-based torpedo dive bomber replace ment Fairey Albacore production Barracudas characterized having horizontal tailplane set high vertical stabilizer much conventional placement horizontal tail first proto type aircraft did work well because buffet ing caused large Fairey-Youngman flaps flaps hung below trailing edge wing did retract later Fairey aircraft could deflected upward 300 position served very effective dive brakes Unfortunately also created turbu lence caused unacceptable buffeting until tail moved higher position production variants John OHara sent photo model prototype Barracuda built Tom Schaefer several years ago model too successful its original configuration two-line control system pen-bladder fuel tank tuned pipe etc fast though best top speed 142 seconds 1268 mph John OHara correctly identified prototype Barracuda selected winner April contest winner February contest Frank Beatty Frank has correctly iden Ionn noiiioy siuw sni ivutriin AM-i Mauler Class 1983 Nats Two-line control system used electronic inrottie control wicrn 5 insulated electrical-type wires feed RC-type decoder drives standard RC servo control box L electronic throt tle control contains RC-type encoder potentiometer attached knob controlling engine speed battery power encoder wire lead plugs insulated control handle Control impulses travel down insulated control lines model June 1988 65 Cono Line Navy Carrier Dick Perry 10035 Deadwood AvL Ellsworth AFB SD 57706 Aprus mystery Plane first prototype Fairey Barracuda flown Britains Royal Navy during after WW II model built Tom Schaefer Class Carrier com petition Wingspan 31 theres 145 sq area Photo John OHara tifying Mystery Planes long have both feature column Congratulations to Continued page 149 0 cf b 0 000 PLENTY OF FREE PARKING Yc C // IA \3/ FAIIIOROUNDS NI * VIMONIUM NO40 N BALTIMORE ~S MARC SHOW MID ATLANTIC RADIO CONTROL JUNE 4 5 1988 Saturday- 9am 5pm Sunday- 10am 4pm MARYLAND STATE FAIR GROUNDS TIMONIUM MARYLAND Sponsored ThE RADK CONTROL MODELERS OF BALilMORE SWAP SHOP $10 FULL TABLE PER DAY $5 E PER DAY NO DEALERS PLEASE Pre-Registration CALL WAYNE MELLOR 301-788-3742 evenings FOR IrIFORMAflOlI COIflACF MARC DIRECTORS DAN YARCHIN & JOHN KIRK 912 Cromwell Bridge Road Towsori MD 21204 301655-0220 301825-8138 packed people bunch people using external controls fuel systems Id like point out few things have come up recently Obviously bladder tank breaks pits may blasted fuel remote chance fire drag external bladder doesnt seem hurt performance too much plane easier build stronger both bellcrank bladder vulnerable impact dam age Since fliers hook lines directly bellcrank much better chance lines being broken using much heavier lead-outs sure inspect line ends often youre used doing seem fray often some reason last column barely hit streets got call Al Kelly offering advice die sel engines Al finds easy work diesels also thinks nothing boring Out Picco 21 making 36 Just flick over says use soft stick whack prop like Racer Tim Gillott Hmmm said Al recommended mixture 35 %-40% ethyl ether 20% oilwhich can mixture cas tor oil mineral oil drugstore Youll also need 2%-3% amyl propyl nitrate rest kerosene ether amyl nitrate may raise eyebrows some folks lo cal chemical supply store because both have uses other model airplane fuels have trouble just show wonderful family-oriented magazine point out infor mation column Al did recommend Davis Diesel conversions sald ABC engines best Fox 36 MK IV would good bet big prop would aid starting beasts Ill bet would also really enhance perform ance Slow Combat model Bonus points Slow mufflers diesels found some real cheap dowels local su permarket work well reinforcing foam wings can put vertically between spars lock place pointed end skewer easily punches through foam just add little glue stuff back through wing cut off flush spar can done field repair after model has covered strengthen lead-out guide area can stick skewers through sip rib foam few inches keep tip flexing steering model important model has lot line rake spars way forward Drilling through engine mount block out 45 0 angle wing another way keep lot rigidity wing little sticks practically free weigh very little add lot strength Spar notches way too big spars Rather pour extra glue try shimming spar us ing medium-weight silkspan Cut piece silkspan about two inches wide youre using % x A-in spars length equal models wingspan Saturate tissue white glue squeegee off excess Put spar middle tissue press spar down foam cores overlapping paper onto foam does tighten up joint bonds spar foam much better Extra layers paper can used over spar add strength can also use small amounts fiberglass cloth things up center section really beef CL Navy Carrier/Perry Continued page 65 As usual will select winner correctly identify months Mystery Plane months winner receives years member ship Navy Carrier Society Nontraditional control systems Bill Boss CL Scale column has number articles about electric electronic control systems CL mo dels January issue provided particularly good summary well addresses inquiring about purchasing electronic control systems Such systems allow two lines provide control multiple functionsa definite advantage Scale models operating features would seem potential advantage Carrier flying well because reduced line drag two lines instead three Ive looked advantages gained using fewer three lines Carrier sim plicity Neither cost Threeline systems cheap easy simple proven available Two-line systems tend An electronic control system also has slight weight penalty model caused necessary bat tery pack decoder servo What advantage potential advantage comes increasing performance reducing line drag analysis performed relied number assumptions simplify process Most assumptions arent critical discussion Ill discuss engineer types curiousContinued page 1S2 June 1988 149 CL Navy Carrier/Perry Continued page 149 significant assumption amount drag caused lines compared drag model itself am aware definitive study evaluate drag three-line control system typical Carrier model model significant variable equation wide range designs makes difficult make definitive assumptions Studies performed some years ago indicate line drag threeline system probably accounts over two-thirds total drag models number probably higher may hard some believe substantiated earlier studies analysis based model perform ance Navy Carrier rules mandate use three-line control systems Profile event discussion limited Class II models Class rules require three 015-in-dia lines two 020-in lines 026-in-dia line class II sizes 018 024 033 re spectively quick look cross-sectional area lines gives idea drag differences Including Reynolds number effects caused changing sizes results numbers approximate 15% reduction line drag going two lines 45% reduction going single line line drag reduced 15% line drag ac counts two-thirds total drag given speed total drag reduction would 10% 10% reduction drag doesnt produce 10% increase speed however Drag changes square speed still isnt answer un less model powered constant-thrust jet engine Because models piston engines essentially constant-power machines perform ance increases related cube speed POWER x VELOCITY bottom line change two lines three will result increase top speed 2% 4% depending model results increase score two points high-drag model capable about 320 points three-line control system about eight points average model capable 380-point flight real advantage comes using monoline system Monoline has potential crease scores 20 points assuming low-speed performance can maintained Unfor tunately fortunately depending point view throttle control monoline system READY TO FLY Call 1-800-45-TO FLY *LOW PRICES *EASY TO ASSEMBLE *NO BUILDING *NO PAINTING Piper Cherokee-40 Piper Cherokee-25 FokkerElll-40 Fancy Stick-25 Cessna 172-20 engine includedl $12999 $10899 $11999 $6999 $10899 Eh SUNSHINE HOBBY 17721 South Western Avenue Gardens California 90247 presents some significant technological hurdles low-speed flight likely slow reliable normal three-line control worth Youll have make own de cision question Non-Scale models Ive received some letters about comments made some months ago about Yak-9 P-Si profile kits suita bility Carrier competition letters have made want discuss issue again Yak-9 prototype doesnt qualify carrierbased aircraft nothing rules prohibits its use Carrier competition Yak9 becomes good Bell Airabonita little mo dification way would recom mend using prototype restrictions made actual carrier takeoffs landings designated carrier aircraft apply bonus points section rules Any model meeting basic specifica tions event can used competition re gardless whether represents qualify ing prototype aircraftit may receive bonus points however Although 100-point bonus Class Class II too significant ignore models have flown effectively Pro file Carrier 10 scale bonus points Laser/Atkisson Continued page 68 F-3 make sure fit together properly Tack glue appropriate scraps onto front engine mounts drill mounting holes install blind nuts dont use engine offset Build jig slip F-2 F-3 place temporarily glue crosspieces maintaining alignment go should become intimate right triangle during phase Raise front fu selage let F-3 fit fully place ensure alignment glue F-i F-2 F-3 place Glue wing mounting blocks A-in stab mounting Align wing drill mounting holes Bolt engine place using incidence meter shim needed make sure engine wing stab zero settings Install flap elevator pushrod leave place Remove wing slide C-i through C-4 place Check alignment straightedge install stringers nose cockpit rear fuselage Sheet ROCKET PLANE xP-1 Only Goes up like rocket Glides down like plane Ready Fly a Wood Crafted THE FLORLO FLYER P37 Johnsonburg Rd 814 834-2586St Marys PA 15857 152 Model Aviation Show Colors BECAUSE WERE PROUD OF THEM take lot pride building model So guess Color paint youre choosing finish take time put paint chip can Perfect Paint color youre buying color want . take guesswork out finishing -0SOSISO Ph 419-797-2208 P0 Box 2480 usky Ohio 44870 6 Modelers U M PChoice - High Quality - Convenient Size st Price Giant Kwik Set Epoxy 16 oz $1395 Gas Model Products 8773 Russet Dr Cincinnati OH 45239 dealer call 513-385-7398 order direct add *150 postage
Edition: Model Aviation - 1988/06
Page Numbers: 65, 149, 152
Send Dick Perry correct identification plane address head co lumn might win years free membership Navy Carrier Society DISCUSSIONS months column will fea ture advantages control systems other usual three-line system use models qualify bonus points usual Mystery Plane contest Mystery Plane April issue pro totype Fairey Barracuda aircraft designed 1937 specification 5 24/37 carrier-based torpedo dive bomber replace ment Fairey Albacore production Barracudas characterized having horizontal tailplane set high vertical stabilizer much conventional placement horizontal tail first proto type aircraft did work well because buffet ing caused large Fairey-Youngman flaps flaps hung below trailing edge wing did retract later Fairey aircraft could deflected upward 300 position served very effective dive brakes Unfortunately also created turbu lence caused unacceptable buffeting until tail moved higher position production variants John OHara sent photo model prototype Barracuda built Tom Schaefer several years ago model too successful its original configuration two-line control system pen-bladder fuel tank tuned pipe etc fast though best top speed 142 seconds 1268 mph John OHara correctly identified prototype Barracuda selected winner April contest winner February contest Frank Beatty Frank has correctly iden Ionn noiiioy siuw sni ivutriin AM-i Mauler Class 1983 Nats Two-line control system used electronic inrottie control wicrn 5 insulated electrical-type wires feed RC-type decoder drives standard RC servo control box L electronic throt tle control contains RC-type encoder potentiometer attached knob controlling engine speed battery power encoder wire lead plugs insulated control handle Control impulses travel down insulated control lines model June 1988 65 Cono Line Navy Carrier Dick Perry 10035 Deadwood AvL Ellsworth AFB SD 57706 Aprus mystery Plane first prototype Fairey Barracuda flown Britains Royal Navy during after WW II model built Tom Schaefer Class Carrier com petition Wingspan 31 theres 145 sq area Photo John OHara tifying Mystery Planes long have both feature column Congratulations to Continued page 149 0 cf b 0 000 PLENTY OF FREE PARKING Yc C // IA \3/ FAIIIOROUNDS NI * VIMONIUM NO40 N BALTIMORE ~S MARC SHOW MID ATLANTIC RADIO CONTROL JUNE 4 5 1988 Saturday- 9am 5pm Sunday- 10am 4pm MARYLAND STATE FAIR GROUNDS TIMONIUM MARYLAND Sponsored ThE RADK CONTROL MODELERS OF BALilMORE SWAP SHOP $10 FULL TABLE PER DAY $5 E PER DAY NO DEALERS PLEASE Pre-Registration CALL WAYNE MELLOR 301-788-3742 evenings FOR IrIFORMAflOlI COIflACF MARC DIRECTORS DAN YARCHIN & JOHN KIRK 912 Cromwell Bridge Road Towsori MD 21204 301655-0220 301825-8138 packed people bunch people using external controls fuel systems Id like point out few things have come up recently Obviously bladder tank breaks pits may blasted fuel remote chance fire drag external bladder doesnt seem hurt performance too much plane easier build stronger both bellcrank bladder vulnerable impact dam age Since fliers hook lines directly bellcrank much better chance lines being broken using much heavier lead-outs sure inspect line ends often youre used doing seem fray often some reason last column barely hit streets got call Al Kelly offering advice die sel engines Al finds easy work diesels also thinks nothing boring Out Picco 21 making 36 Just flick over says use soft stick whack prop like Racer Tim Gillott Hmmm said Al recommended mixture 35 %-40% ethyl ether 20% oilwhich can mixture cas tor oil mineral oil drugstore Youll also need 2%-3% amyl propyl nitrate rest kerosene ether amyl nitrate may raise eyebrows some folks lo cal chemical supply store because both have uses other model airplane fuels have trouble just show wonderful family-oriented magazine point out infor mation column Al did recommend Davis Diesel conversions sald ABC engines best Fox 36 MK IV would good bet big prop would aid starting beasts Ill bet would also really enhance perform ance Slow Combat model Bonus points Slow mufflers diesels found some real cheap dowels local su permarket work well reinforcing foam wings can put vertically between spars lock place pointed end skewer easily punches through foam just add little glue stuff back through wing cut off flush spar can done field repair after model has covered strengthen lead-out guide area can stick skewers through sip rib foam few inches keep tip flexing steering model important model has lot line rake spars way forward Drilling through engine mount block out 45 0 angle wing another way keep lot rigidity wing little sticks practically free weigh very little add lot strength Spar notches way too big spars Rather pour extra glue try shimming spar us ing medium-weight silkspan Cut piece silkspan about two inches wide youre using % x A-in spars length equal models wingspan Saturate tissue white glue squeegee off excess Put spar middle tissue press spar down foam cores overlapping paper onto foam does tighten up joint bonds spar foam much better Extra layers paper can used over spar add strength can also use small amounts fiberglass cloth things up center section really beef CL Navy Carrier/Perry Continued page 65 As usual will select winner correctly identify months Mystery Plane months winner receives years member ship Navy Carrier Society Nontraditional control systems Bill Boss CL Scale column has number articles about electric electronic control systems CL mo dels January issue provided particularly good summary well addresses inquiring about purchasing electronic control systems Such systems allow two lines provide control multiple functionsa definite advantage Scale models operating features would seem potential advantage Carrier flying well because reduced line drag two lines instead three Ive looked advantages gained using fewer three lines Carrier sim plicity Neither cost Threeline systems cheap easy simple proven available Two-line systems tend An electronic control system also has slight weight penalty model caused necessary bat tery pack decoder servo What advantage potential advantage comes increasing performance reducing line drag analysis performed relied number assumptions simplify process Most assumptions arent critical discussion Ill discuss engineer types curiousContinued page 1S2 June 1988 149 CL Navy Carrier/Perry Continued page 149 significant assumption amount drag caused lines compared drag model itself am aware definitive study evaluate drag three-line control system typical Carrier model model significant variable equation wide range designs makes difficult make definitive assumptions Studies performed some years ago indicate line drag threeline system probably accounts over two-thirds total drag models number probably higher may hard some believe substantiated earlier studies analysis based model perform ance Navy Carrier rules mandate use three-line control systems Profile event discussion limited Class II models Class rules require three 015-in-dia lines two 020-in lines 026-in-dia line class II sizes 018 024 033 re spectively quick look cross-sectional area lines gives idea drag differences Including Reynolds number effects caused changing sizes results numbers approximate 15% reduction line drag going two lines 45% reduction going single line line drag reduced 15% line drag ac counts two-thirds total drag given speed total drag reduction would 10% 10% reduction drag doesnt produce 10% increase speed however Drag changes square speed still isnt answer un less model powered constant-thrust jet engine Because models piston engines essentially constant-power machines perform ance increases related cube speed POWER x VELOCITY bottom line change two lines three will result increase top speed 2% 4% depending model results increase score two points high-drag model capable about 320 points three-line control system about eight points average model capable 380-point flight real advantage comes using monoline system Monoline has potential crease scores 20 points assuming low-speed performance can maintained Unfor tunately fortunately depending point view throttle control monoline system READY TO FLY Call 1-800-45-TO FLY *LOW PRICES *EASY TO ASSEMBLE *NO BUILDING *NO PAINTING Piper Cherokee-40 Piper Cherokee-25 FokkerElll-40 Fancy Stick-25 Cessna 172-20 engine includedl $12999 $10899 $11999 $6999 $10899 Eh SUNSHINE HOBBY 17721 South Western Avenue Gardens California 90247 presents some significant technological hurdles low-speed flight likely slow reliable normal three-line control worth Youll have make own de cision question Non-Scale models Ive received some letters about comments made some months ago about Yak-9 P-Si profile kits suita bility Carrier competition letters have made want discuss issue again Yak-9 prototype doesnt qualify carrierbased aircraft nothing rules prohibits its use Carrier competition Yak9 becomes good Bell Airabonita little mo dification way would recom mend using prototype restrictions made actual carrier takeoffs landings designated carrier aircraft apply bonus points section rules Any model meeting basic specifica tions event can used competition re gardless whether represents qualify ing prototype aircraftit may receive bonus points however Although 100-point bonus Class Class II too significant ignore models have flown effectively Pro file Carrier 10 scale bonus points Laser/Atkisson Continued page 68 F-3 make sure fit together properly Tack glue appropriate scraps onto front engine mounts drill mounting holes install blind nuts dont use engine offset Build jig slip F-2 F-3 place temporarily glue crosspieces maintaining alignment go should become intimate right triangle during phase Raise front fu selage let F-3 fit fully place ensure alignment glue F-i F-2 F-3 place Glue wing mounting blocks A-in stab mounting Align wing drill mounting holes Bolt engine place using incidence meter shim needed make sure engine wing stab zero settings Install flap elevator pushrod leave place Remove wing slide C-i through C-4 place Check alignment straightedge install stringers nose cockpit rear fuselage Sheet ROCKET PLANE xP-1 Only Goes up like rocket Glides down like plane Ready Fly a Wood Crafted THE FLORLO FLYER P37 Johnsonburg Rd 814 834-2586St Marys PA 15857 152 Model Aviation Show Colors BECAUSE WERE PROUD OF THEM take lot pride building model So guess Color paint youre choosing finish take time put paint chip can Perfect Paint color youre buying color want . take guesswork out finishing -0SOSISO Ph 419-797-2208 P0 Box 2480 usky Ohio 44870 6 Modelers U M PChoice - High Quality - Convenient Size st Price Giant Kwik Set Epoxy 16 oz $1395 Gas Model Products 8773 Russet Dr Cincinnati OH 45239 dealer call 513-385-7398 order direct add *150 postage