FREE FLIGHT DURATION TIMER TUNING different clockwork timers available Eastern Europe Most use same gear mechanismcopied German Leica camera self-timer Self-timers need run 15 20 secondsjust long enough hit hutton jump picture free flight need things run five ten minutes means slowing things down lot makes timers much susceptible dirt doesnt take much bring timers screeching halt Cleaning timer keeping clean lot trouble lot less trouble building new airplane help whole process cleaning lubricating maintaining clockwork timer Ron Felix has put together Timers How-To Maintenance Text eight-page booklet Ron covers basic tools needed disassembly cleaning inspection polishing lubrication discusses techniques lightening timer basic timer mechanism mounted between two rectangular brass plates typical three-function Wakefield timer rectangular plates will weigh about 18 grams carefully sawing filing away plates overall weight can reduced about 14 grams Some commercially-available timers have already done So want move beyond squirting timer full WD-40 get Rons booklet $2 plus $1 postage Ron Felix Box 74 Solebury PA 18963 HTL course stands High Thrust Line Ive always soft spot heart head high thrustline power models first /2A Gas kits back mid-1950s Midwest T-Bird Vertical takeoffs VTOs very interesting wind until finally learned launch downwind model wouldnt flip over its back Although high-thrustline models have around 40 years havent noticed too new HTL designs Bruce Augustus surprised three-views photos Topgun FlJ design designed December 1989 same time Bruces Northern Light pylon FlJ Northern Light design took off literally Bruce neglected Topgun design few years Recently dusted off put AD 06 up front recovered wing stab tissue went flying result win FlJ FF Champs Lost Hills last Labor Day Construction conventional balsa-andtissue carbon- fiber reinforcements needed 340-square-inch wing spans about 50 inches uses wellproven Starduster 350 section Weight 220 grams Unlike other F1J designs does use autorudder autostab bunt Full-size plans complete building flying instructions available $12 postpaid United States Write Bruce Augustus Airlines Box 450 Sun Valley ID 83353 Tapered Wings Part Back aspect ratios single digits tapering wings didnt seem too terribly important could just cut out bunch identical ribs set leading trailing edge parallel build away wings get longer longer pressure competition requires higher higher performance tapered wings least tapered tips start make lot sense Since wing tip chord smaller 118 Model Aviation kwork timer brain todays high-tech FiBs Accurate consistent control model functions Danish Wakefield flier Jorgen Korsgaard builds high-tech carbon-fiber wings low-tech balsa wing jigs See text Tapered wings offer elegant aerodynamic alternative constant-chord wings Ron McBurnetts FiG fun will ff1111 IHIi 111111 14p ffli [I liii 0 JUL tt 21 K 4 N 0 U 7 N 0 1 Emj 1114 UIWRTENOW4E CLEAR PYLON N___________ 1 WING AREA 340 SO IN STAB AREA 103 SO IN 30% WT220 GR ENGINEAD 06 PROPELLER APC 57 x 3 FLY LEFT-LEFT TILT STAB FOR GLIDE BRUCE AUGUSTUS 12M9C 2 S-ill C r H1ADOER TER II\1PLU I/Il SICES TOEIY TIEER 37 TISSUE COVER2SThIPSIg ISIS CFTtPABOTTOtd 21-ill--- ill PYLON 1116 SIDES ill SO LONGERONS IllS PLY BUD N STAB T T FOR EFIG CE IIiHI T FUSE OT] 1116 FIN LEFT OFFSET March1995 119 1143 T1IRUST OFFSETS FRO14 WING NGINIT CG 10% OK SPARK & GLOW OK CUB COMET 049 MOHAWK CHIEF/ BANTAM OK BROWN CO-2 Onginal Factoty Parts Accessories Send $2 catalog OK ENGINES BOX 355 MOHAWK NY 13407 tapered wing constantchord wing same area vortex tip should less thus reducing drag perhaps importantly center gravity wing half will closer fuselage tips will lighter Just like light tail light tips make model lively airable handle disturbances stalling Just about bad thing about tapered wings harder build True some ways construct tapered wings quickly accurately First lets look wing planform typical polyhedral wing can have either constant-chord inner panels tapered tips four panels can tapered Normally double-tapered wings tips sharply tapered inner panels effort come close elliptical area distribution typical FAI power model might have root chord seven inches chord 61/2 inches break tip chord 4/2 inches Once have wing outline drawn need photocopy root airfoil down right length break tips right Well can theory Ive read lately suggests need reduce both camber thickness airfoil go root out tip Unfortunately means replotting airfoil suggestion decrease thickness camber same percentage chord reduced above example break chord 93% root chord 65 divided 7 tip chord 64% root chord 45 divided 7 need multiply root airfoil coordinates 93% give break coordinates 64% get tip airfoil coordinates have airfoil software programs takes few minutes run numbers Another method used Moscow glider fliers Sergei Makarov Mikhail Kochkarov reduce thickness camber half percent break another half percent tip other words 6% thick root airfoil would reduced 55% break 5% tip Although math might take few minutes further complication building undercambered tapered wings especially double-tapered wings need wing jigs basically curved building boards match undercamber wing eliminate need packing up front trailing edge scraps balsa have trying build undercambered wing flat building board Certain types construction such partially fully sheeted wings virtually impossible build undercambered wing jig simplest open-frame wing can built quickly accurately undercambered jig Remember talking about building wing both tapers width changes airfoil camber root tip So double-tapered wing going need separate undercamber jig panelfour wing constantchord inner panels tapered tips will need least three jigstwo tips main panel further complicate things will need decide exact wing washin washout build jig panel unsure exact wing washes need just want save time can just build constantchord undercamber jig thats long enough build main tip panel time curve jig will course match bottom surface wing root rib same end jig other Surprisingly curve jig will come very close matching bottom curve break tip airfoils plotted using either above methods Besides time money savings single constant-chord jig takes up much less room workshop what about washin washout Thats best part about constant-chord jig can build much little wash want simply skewing tapered panel jig simply cut up 120 Model Aviation MADE IN AMEIUCA GBLADE IMPORTED FROM ENGIAND FLOURESCENT FIBERGLASS ROTOR BLADES 60 SIZE 860 REFLEX BICONVEXSYMETRIC 11999 60 SIZE 680 SYMETRICAL11999 4048 FITS MOSKITOX-CELL 407499 30 SIZE8999 MINATURE AIRCRAFT XCELL 60 HEU KIT59999 X-CELL 80 CUSTOM KIT 94 VERSION69999 XCELL40 HEUCOPTER KIT40999 XCELL GAS NEW99999 S-CELL PRO NEW114999 XCELL PRO CONy KIT NEW36999 X-CELL 39 HEUCOPTER KIT .36999 CARL GOLDBERG MODELS SUKHOISU2614499 NEWIII1GER6O9499 SUPERCHIPMUNK10999 ULTIMATE 91-PLANE13099 EXTRA3W6O139POWER ..11999 -4 EXTENSIVE INVENTORY OF ROBBEISCHLUTER KITS & V SKYFLEX114993194 SKYFLEX 300 NEW!114993394 SKYFLEX V GLOW 12799 3205 WE ACCEPT VlSA MASTERCARD & DISCOVER CARDS WE GLADLY SHIP COD SHIPPING & HANDLING $699 PER KIT CONTINENTAL USA OTHER AREAS CALL KY RESIDENTS ADD 6% SALES TAX HOBBY HANGAR IS FULL SERVICE HOBBY SHOP WITH OVER 11000 ITEMS IN STOCK 1994 CATALOGS AVAILABLE CALL FOR YOURS TODAYI HOBBY HANGAR 153 LLOYD AVENUEFLORENCE KY 41942 6061293-5748 60612824868 FAX PRICES SUBJECT TO CHANGE AT ANY TIME 9111094AMA THE GOLDEN ERA OF AIR RACING LIVES NOW CAN OWN COLLECTION OF THE FAMOUS RACING PLANES OF THE 3C5 LIKE THE GEE BEE Z GEE BEE R1 HALL BuLLDOG WEDELL WILLIAMS AND CAUDRON RACER SCHOENFELOT FIRECRACKER ALL HIGHLY DETAILED 1132 SCALE KITS SEND SASE FOR ILLUSTRATED ORDER FORM saoa FOR CATALOG WILLIAMS BROSI INC 181 PAWNEE ST SAN MARCOS CA 92069 wing plans four separate panels build tape down jig desired washout washin typical tip washout means tip leading edge approximately parallel front edge wing jig few minutes careful measuring will give exact amount skew Wing jigs really easy construct especially know hot-wire foam dont get RC flier demonstrate wing jig will need sturdy warp-free base usually use piece 3/4-inch birch plywood cut about halfinch wider wing chord about inch longer constant-chord jig want make four separate jigs panel cut bases approximately match taper panel Cut out /32 18 plywood ribs match bottom curve airfoil building single constant-chord jig need two identical ribs match root airfoil doing four separate jigs will need two roots four breaks two tips Any washin washout must built jig ribs like extend ribs slightly maybe inch front back making single constantchord jig dont want fool foam use plywood ribs cut good supply balsa ribs use medium /8 balsa space about 3/4 inch apart foam-filled jig cut expanded polystyrene foam approximate wing planform glue 3/4 plywood epoxy Now glue end ribs hotwire foam using plywood ribs guides dont want cut foam way just use long sanding stick sand foam flush plywood end ribs usually add strip balsa along front rear foam trim off flush Cover top jig piece 116 plywood using epoxy have also used 1/33 plywood /32 balsa jig surfaces like use lots pins go balsa usually give entire jig couple coats nonshnnking dope protect humidity last few jigs have added row /8 dowels along front rear base spaced about inch apart allows hook rubber bands over top jig hold leading trailing edges down during construction Next month well talk bit about actual building process including cutting ribs 4In April Model Aviation Aeronca Defender Doc Mathews CL World Championships report Bill Lee Rich von Lopez US FF Champs John Oldenkamp How-To Mounting On-Off Switch THE WOODPECKERTM First Convertible Multi-Purpose Covering Tool Pat Peed NOW YOU CAN COVER LIKE THE PROS No Bubbles Covering Looks Great Long After its Applied Film Over Film No Problem 114E WmDPRICFR easily converts allow apply trims choice See Hobby Dealer First Z m Only $1895 Visa & MIC AcceptedCA eaderrrs add 6775% sales lao Made ix USAFor orders Sreei Coesrrocton1-500-335-5602 VIrieiSflOta 07 y 50 COOs No Sags Works Iron-On Coverings No Need Use Any Prep Easy Use DIEWOODPRXER" will weaken integrity structure Send Check/Money Order Directly UNIQUE MODEL PRODUCTS PO Box 2229 Lake Arrowhead CA 92352-2229 rrforrrrariorr Coil 909 336-5602 FAX 909 336-2719 DEALER INQUIRIES WELCOME SPECIALIST IN CUSTOM COX TEE DEE & REED ENGINES 020S 049S 051S 074S & 09S ALL CUSTOM & STOCK PARTS AVAILABLE INDIVIDUALLY COMPETITION ACCESSORIES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF TUBING THREE BRANDS OF GLOW PLUGS HARD-TO-FIND HARDWARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 8 COLORS QUALITY DOPE BRUSHES 5 & 7 LOOP 114 RUBBERBANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 112A TEXACO PLAYBOY SR KIT 1/2A TEXACO ENGINES & PARTS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLATES & EPOXIES ORDER BY MAIL OR PHONE 619 728-4365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $395 STOCK ORDERS SHIPPED WITHIN 24 HRS Also. Traditional line non-idle bar Glow Plugs SIx Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $169 Swanson AssocIate PO Box 151 Wayne NJ c 7948 07470 MTMI March 1995 121 OUR REV-ur INVN UHY AVERAGES OVER 9000 PROPSIII IMMEDIATE SHIPMENT VISAJMC WrJball R/C Idle-Bar Glow Plugs Long Short $209 Only
Edition: Model Aviation - 1995/03
Page Numbers: 118, 119, 120, 121
FREE FLIGHT DURATION TIMER TUNING different clockwork timers available Eastern Europe Most use same gear mechanismcopied German Leica camera self-timer Self-timers need run 15 20 secondsjust long enough hit hutton jump picture free flight need things run five ten minutes means slowing things down lot makes timers much susceptible dirt doesnt take much bring timers screeching halt Cleaning timer keeping clean lot trouble lot less trouble building new airplane help whole process cleaning lubricating maintaining clockwork timer Ron Felix has put together Timers How-To Maintenance Text eight-page booklet Ron covers basic tools needed disassembly cleaning inspection polishing lubrication discusses techniques lightening timer basic timer mechanism mounted between two rectangular brass plates typical three-function Wakefield timer rectangular plates will weigh about 18 grams carefully sawing filing away plates overall weight can reduced about 14 grams Some commercially-available timers have already done So want move beyond squirting timer full WD-40 get Rons booklet $2 plus $1 postage Ron Felix Box 74 Solebury PA 18963 HTL course stands High Thrust Line Ive always soft spot heart head high thrustline power models first /2A Gas kits back mid-1950s Midwest T-Bird Vertical takeoffs VTOs very interesting wind until finally learned launch downwind model wouldnt flip over its back Although high-thrustline models have around 40 years havent noticed too new HTL designs Bruce Augustus surprised three-views photos Topgun FlJ design designed December 1989 same time Bruces Northern Light pylon FlJ Northern Light design took off literally Bruce neglected Topgun design few years Recently dusted off put AD 06 up front recovered wing stab tissue went flying result win FlJ FF Champs Lost Hills last Labor Day Construction conventional balsa-andtissue carbon- fiber reinforcements needed 340-square-inch wing spans about 50 inches uses wellproven Starduster 350 section Weight 220 grams Unlike other F1J designs does use autorudder autostab bunt Full-size plans complete building flying instructions available $12 postpaid United States Write Bruce Augustus Airlines Box 450 Sun Valley ID 83353 Tapered Wings Part Back aspect ratios single digits tapering wings didnt seem too terribly important could just cut out bunch identical ribs set leading trailing edge parallel build away wings get longer longer pressure competition requires higher higher performance tapered wings least tapered tips start make lot sense Since wing tip chord smaller 118 Model Aviation kwork timer brain todays high-tech FiBs Accurate consistent control model functions Danish Wakefield flier Jorgen Korsgaard builds high-tech carbon-fiber wings low-tech balsa wing jigs See text Tapered wings offer elegant aerodynamic alternative constant-chord wings Ron McBurnetts FiG fun will ff1111 IHIi 111111 14p ffli [I liii 0 JUL tt 21 K 4 N 0 U 7 N 0 1 Emj 1114 UIWRTENOW4E CLEAR PYLON N___________ 1 WING AREA 340 SO IN STAB AREA 103 SO IN 30% WT220 GR ENGINEAD 06 PROPELLER APC 57 x 3 FLY LEFT-LEFT TILT STAB FOR GLIDE BRUCE AUGUSTUS 12M9C 2 S-ill C r H1ADOER TER II\1PLU I/Il SICES TOEIY TIEER 37 TISSUE COVER2SThIPSIg ISIS CFTtPABOTTOtd 21-ill--- ill PYLON 1116 SIDES ill SO LONGERONS IllS PLY BUD N STAB T T FOR EFIG CE IIiHI T FUSE OT] 1116 FIN LEFT OFFSET March1995 119 1143 T1IRUST OFFSETS FRO14 WING NGINIT CG 10% OK SPARK & GLOW OK CUB COMET 049 MOHAWK CHIEF/ BANTAM OK BROWN CO-2 Onginal Factoty Parts Accessories Send $2 catalog OK ENGINES BOX 355 MOHAWK NY 13407 tapered wing constantchord wing same area vortex tip should less thus reducing drag perhaps importantly center gravity wing half will closer fuselage tips will lighter Just like light tail light tips make model lively airable handle disturbances stalling Just about bad thing about tapered wings harder build True some ways construct tapered wings quickly accurately First lets look wing planform typical polyhedral wing can have either constant-chord inner panels tapered tips four panels can tapered Normally double-tapered wings tips sharply tapered inner panels effort come close elliptical area distribution typical FAI power model might have root chord seven inches chord 61/2 inches break tip chord 4/2 inches Once have wing outline drawn need photocopy root airfoil down right length break tips right Well can theory Ive read lately suggests need reduce both camber thickness airfoil go root out tip Unfortunately means replotting airfoil suggestion decrease thickness camber same percentage chord reduced above example break chord 93% root chord 65 divided 7 tip chord 64% root chord 45 divided 7 need multiply root airfoil coordinates 93% give break coordinates 64% get tip airfoil coordinates have airfoil software programs takes few minutes run numbers Another method used Moscow glider fliers Sergei Makarov Mikhail Kochkarov reduce thickness camber half percent break another half percent tip other words 6% thick root airfoil would reduced 55% break 5% tip Although math might take few minutes further complication building undercambered tapered wings especially double-tapered wings need wing jigs basically curved building boards match undercamber wing eliminate need packing up front trailing edge scraps balsa have trying build undercambered wing flat building board Certain types construction such partially fully sheeted wings virtually impossible build undercambered wing jig simplest open-frame wing can built quickly accurately undercambered jig Remember talking about building wing both tapers width changes airfoil camber root tip So double-tapered wing going need separate undercamber jig panelfour wing constantchord inner panels tapered tips will need least three jigstwo tips main panel further complicate things will need decide exact wing washin washout build jig panel unsure exact wing washes need just want save time can just build constantchord undercamber jig thats long enough build main tip panel time curve jig will course match bottom surface wing root rib same end jig other Surprisingly curve jig will come very close matching bottom curve break tip airfoils plotted using either above methods Besides time money savings single constant-chord jig takes up much less room workshop what about washin washout Thats best part about constant-chord jig can build much little wash want simply skewing tapered panel jig simply cut up 120 Model Aviation MADE IN AMEIUCA GBLADE IMPORTED FROM ENGIAND FLOURESCENT FIBERGLASS ROTOR BLADES 60 SIZE 860 REFLEX BICONVEXSYMETRIC 11999 60 SIZE 680 SYMETRICAL11999 4048 FITS MOSKITOX-CELL 407499 30 SIZE8999 MINATURE AIRCRAFT XCELL 60 HEU KIT59999 X-CELL 80 CUSTOM KIT 94 VERSION69999 XCELL40 HEUCOPTER KIT40999 XCELL GAS NEW99999 S-CELL PRO NEW114999 XCELL PRO CONy KIT NEW36999 X-CELL 39 HEUCOPTER KIT .36999 CARL GOLDBERG MODELS SUKHOISU2614499 NEWIII1GER6O9499 SUPERCHIPMUNK10999 ULTIMATE 91-PLANE13099 EXTRA3W6O139POWER ..11999 -4 EXTENSIVE INVENTORY OF ROBBEISCHLUTER KITS & V SKYFLEX114993194 SKYFLEX 300 NEW!114993394 SKYFLEX V GLOW 12799 3205 WE ACCEPT VlSA MASTERCARD & DISCOVER CARDS WE GLADLY SHIP COD SHIPPING & HANDLING $699 PER KIT CONTINENTAL USA OTHER AREAS CALL KY RESIDENTS ADD 6% SALES TAX HOBBY HANGAR IS FULL SERVICE HOBBY SHOP WITH OVER 11000 ITEMS IN STOCK 1994 CATALOGS AVAILABLE CALL FOR YOURS TODAYI HOBBY HANGAR 153 LLOYD AVENUEFLORENCE KY 41942 6061293-5748 60612824868 FAX PRICES SUBJECT TO CHANGE AT ANY TIME 9111094AMA THE GOLDEN ERA OF AIR RACING LIVES NOW CAN OWN COLLECTION OF THE FAMOUS RACING PLANES OF THE 3C5 LIKE THE GEE BEE Z GEE BEE R1 HALL BuLLDOG WEDELL WILLIAMS AND CAUDRON RACER SCHOENFELOT FIRECRACKER ALL HIGHLY DETAILED 1132 SCALE KITS SEND SASE FOR ILLUSTRATED ORDER FORM saoa FOR CATALOG WILLIAMS BROSI INC 181 PAWNEE ST SAN MARCOS CA 92069 wing plans four separate panels build tape down jig desired washout washin typical tip washout means tip leading edge approximately parallel front edge wing jig few minutes careful measuring will give exact amount skew Wing jigs really easy construct especially know hot-wire foam dont get RC flier demonstrate wing jig will need sturdy warp-free base usually use piece 3/4-inch birch plywood cut about halfinch wider wing chord about inch longer constant-chord jig want make four separate jigs panel cut bases approximately match taper panel Cut out /32 18 plywood ribs match bottom curve airfoil building single constant-chord jig need two identical ribs match root airfoil doing four separate jigs will need two roots four breaks two tips Any washin washout must built jig ribs like extend ribs slightly maybe inch front back making single constantchord jig dont want fool foam use plywood ribs cut good supply balsa ribs use medium /8 balsa space about 3/4 inch apart foam-filled jig cut expanded polystyrene foam approximate wing planform glue 3/4 plywood epoxy Now glue end ribs hotwire foam using plywood ribs guides dont want cut foam way just use long sanding stick sand foam flush plywood end ribs usually add strip balsa along front rear foam trim off flush Cover top jig piece 116 plywood using epoxy have also used 1/33 plywood /32 balsa jig surfaces like use lots pins go balsa usually give entire jig couple coats nonshnnking dope protect humidity last few jigs have added row /8 dowels along front rear base spaced about inch apart allows hook rubber bands over top jig hold leading trailing edges down during construction Next month well talk bit about actual building process including cutting ribs 4In April Model Aviation Aeronca Defender Doc Mathews CL World Championships report Bill Lee Rich von Lopez US FF Champs John Oldenkamp How-To Mounting On-Off Switch THE WOODPECKERTM First Convertible Multi-Purpose Covering Tool Pat Peed NOW YOU CAN COVER LIKE THE PROS No Bubbles Covering Looks Great Long After its Applied Film Over Film No Problem 114E WmDPRICFR easily converts allow apply trims choice See Hobby Dealer First Z m Only $1895 Visa & MIC AcceptedCA eaderrrs add 6775% sales lao Made ix USAFor orders Sreei Coesrrocton1-500-335-5602 VIrieiSflOta 07 y 50 COOs No Sags Works Iron-On Coverings No Need Use Any Prep Easy Use DIEWOODPRXER" will weaken integrity structure Send Check/Money Order Directly UNIQUE MODEL PRODUCTS PO Box 2229 Lake Arrowhead CA 92352-2229 rrforrrrariorr Coil 909 336-5602 FAX 909 336-2719 DEALER INQUIRIES WELCOME SPECIALIST IN CUSTOM COX TEE DEE & REED ENGINES 020S 049S 051S 074S & 09S ALL CUSTOM & STOCK PARTS AVAILABLE INDIVIDUALLY COMPETITION ACCESSORIES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF TUBING THREE BRANDS OF GLOW PLUGS HARD-TO-FIND HARDWARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 8 COLORS QUALITY DOPE BRUSHES 5 & 7 LOOP 114 RUBBERBANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 112A TEXACO PLAYBOY SR KIT 1/2A TEXACO ENGINES & PARTS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLATES & EPOXIES ORDER BY MAIL OR PHONE 619 728-4365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $395 STOCK ORDERS SHIPPED WITHIN 24 HRS Also. Traditional line non-idle bar Glow Plugs SIx Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $169 Swanson AssocIate PO Box 151 Wayne NJ c 7948 07470 MTMI March 1995 121 OUR REV-ur INVN UHY AVERAGES OVER 9000 PROPSIII IMMEDIATE SHIPMENT VISAJMC WrJball R/C Idle-Bar Glow Plugs Long Short $209 Only
Edition: Model Aviation - 1995/03
Page Numbers: 118, 119, 120, 121
FREE FLIGHT DURATION TIMER TUNING different clockwork timers available Eastern Europe Most use same gear mechanismcopied German Leica camera self-timer Self-timers need run 15 20 secondsjust long enough hit hutton jump picture free flight need things run five ten minutes means slowing things down lot makes timers much susceptible dirt doesnt take much bring timers screeching halt Cleaning timer keeping clean lot trouble lot less trouble building new airplane help whole process cleaning lubricating maintaining clockwork timer Ron Felix has put together Timers How-To Maintenance Text eight-page booklet Ron covers basic tools needed disassembly cleaning inspection polishing lubrication discusses techniques lightening timer basic timer mechanism mounted between two rectangular brass plates typical three-function Wakefield timer rectangular plates will weigh about 18 grams carefully sawing filing away plates overall weight can reduced about 14 grams Some commercially-available timers have already done So want move beyond squirting timer full WD-40 get Rons booklet $2 plus $1 postage Ron Felix Box 74 Solebury PA 18963 HTL course stands High Thrust Line Ive always soft spot heart head high thrustline power models first /2A Gas kits back mid-1950s Midwest T-Bird Vertical takeoffs VTOs very interesting wind until finally learned launch downwind model wouldnt flip over its back Although high-thrustline models have around 40 years havent noticed too new HTL designs Bruce Augustus surprised three-views photos Topgun FlJ design designed December 1989 same time Bruces Northern Light pylon FlJ Northern Light design took off literally Bruce neglected Topgun design few years Recently dusted off put AD 06 up front recovered wing stab tissue went flying result win FlJ FF Champs Lost Hills last Labor Day Construction conventional balsa-andtissue carbon- fiber reinforcements needed 340-square-inch wing spans about 50 inches uses wellproven Starduster 350 section Weight 220 grams Unlike other F1J designs does use autorudder autostab bunt Full-size plans complete building flying instructions available $12 postpaid United States Write Bruce Augustus Airlines Box 450 Sun Valley ID 83353 Tapered Wings Part Back aspect ratios single digits tapering wings didnt seem too terribly important could just cut out bunch identical ribs set leading trailing edge parallel build away wings get longer longer pressure competition requires higher higher performance tapered wings least tapered tips start make lot sense Since wing tip chord smaller 118 Model Aviation kwork timer brain todays high-tech FiBs Accurate consistent control model functions Danish Wakefield flier Jorgen Korsgaard builds high-tech carbon-fiber wings low-tech balsa wing jigs See text Tapered wings offer elegant aerodynamic alternative constant-chord wings Ron McBurnetts FiG fun will ff1111 IHIi 111111 14p ffli [I liii 0 JUL tt 21 K 4 N 0 U 7 N 0 1 Emj 1114 UIWRTENOW4E CLEAR PYLON N___________ 1 WING AREA 340 SO IN STAB AREA 103 SO IN 30% WT220 GR ENGINEAD 06 PROPELLER APC 57 x 3 FLY LEFT-LEFT TILT STAB FOR GLIDE BRUCE AUGUSTUS 12M9C 2 S-ill C r H1ADOER TER II\1PLU I/Il SICES TOEIY TIEER 37 TISSUE COVER2SThIPSIg ISIS CFTtPABOTTOtd 21-ill--- ill PYLON 1116 SIDES ill SO LONGERONS IllS PLY BUD N STAB T T FOR EFIG CE IIiHI T FUSE OT] 1116 FIN LEFT OFFSET March1995 119 1143 T1IRUST OFFSETS FRO14 WING NGINIT CG 10% OK SPARK & GLOW OK CUB COMET 049 MOHAWK CHIEF/ BANTAM OK BROWN CO-2 Onginal Factoty Parts Accessories Send $2 catalog OK ENGINES BOX 355 MOHAWK NY 13407 tapered wing constantchord wing same area vortex tip should less thus reducing drag perhaps importantly center gravity wing half will closer fuselage tips will lighter Just like light tail light tips make model lively airable handle disturbances stalling Just about bad thing about tapered wings harder build True some ways construct tapered wings quickly accurately First lets look wing planform typical polyhedral wing can have either constant-chord inner panels tapered tips four panels can tapered Normally double-tapered wings tips sharply tapered inner panels effort come close elliptical area distribution typical FAI power model might have root chord seven inches chord 61/2 inches break tip chord 4/2 inches Once have wing outline drawn need photocopy root airfoil down right length break tips right Well can theory Ive read lately suggests need reduce both camber thickness airfoil go root out tip Unfortunately means replotting airfoil suggestion decrease thickness camber same percentage chord reduced above example break chord 93% root chord 65 divided 7 tip chord 64% root chord 45 divided 7 need multiply root airfoil coordinates 93% give break coordinates 64% get tip airfoil coordinates have airfoil software programs takes few minutes run numbers Another method used Moscow glider fliers Sergei Makarov Mikhail Kochkarov reduce thickness camber half percent break another half percent tip other words 6% thick root airfoil would reduced 55% break 5% tip Although math might take few minutes further complication building undercambered tapered wings especially double-tapered wings need wing jigs basically curved building boards match undercamber wing eliminate need packing up front trailing edge scraps balsa have trying build undercambered wing flat building board Certain types construction such partially fully sheeted wings virtually impossible build undercambered wing jig simplest open-frame wing can built quickly accurately undercambered jig Remember talking about building wing both tapers width changes airfoil camber root tip So double-tapered wing going need separate undercamber jig panelfour wing constantchord inner panels tapered tips will need least three jigstwo tips main panel further complicate things will need decide exact wing washin washout build jig panel unsure exact wing washes need just want save time can just build constantchord undercamber jig thats long enough build main tip panel time curve jig will course match bottom surface wing root rib same end jig other Surprisingly curve jig will come very close matching bottom curve break tip airfoils plotted using either above methods Besides time money savings single constant-chord jig takes up much less room workshop what about washin washout Thats best part about constant-chord jig can build much little wash want simply skewing tapered panel jig simply cut up 120 Model Aviation MADE IN AMEIUCA GBLADE IMPORTED FROM ENGIAND FLOURESCENT FIBERGLASS ROTOR BLADES 60 SIZE 860 REFLEX BICONVEXSYMETRIC 11999 60 SIZE 680 SYMETRICAL11999 4048 FITS MOSKITOX-CELL 407499 30 SIZE8999 MINATURE AIRCRAFT XCELL 60 HEU KIT59999 X-CELL 80 CUSTOM KIT 94 VERSION69999 XCELL40 HEUCOPTER KIT40999 XCELL GAS NEW99999 S-CELL PRO NEW114999 XCELL PRO CONy KIT NEW36999 X-CELL 39 HEUCOPTER KIT .36999 CARL GOLDBERG MODELS SUKHOISU2614499 NEWIII1GER6O9499 SUPERCHIPMUNK10999 ULTIMATE 91-PLANE13099 EXTRA3W6O139POWER ..11999 -4 EXTENSIVE INVENTORY OF ROBBEISCHLUTER KITS & V SKYFLEX114993194 SKYFLEX 300 NEW!114993394 SKYFLEX V GLOW 12799 3205 WE ACCEPT VlSA MASTERCARD & DISCOVER CARDS WE GLADLY SHIP COD SHIPPING & HANDLING $699 PER KIT CONTINENTAL USA OTHER AREAS CALL KY RESIDENTS ADD 6% SALES TAX HOBBY HANGAR IS FULL SERVICE HOBBY SHOP WITH OVER 11000 ITEMS IN STOCK 1994 CATALOGS AVAILABLE CALL FOR YOURS TODAYI HOBBY HANGAR 153 LLOYD AVENUEFLORENCE KY 41942 6061293-5748 60612824868 FAX PRICES SUBJECT TO CHANGE AT ANY TIME 9111094AMA THE GOLDEN ERA OF AIR RACING LIVES NOW CAN OWN COLLECTION OF THE FAMOUS RACING PLANES OF THE 3C5 LIKE THE GEE BEE Z GEE BEE R1 HALL BuLLDOG WEDELL WILLIAMS AND CAUDRON RACER SCHOENFELOT FIRECRACKER ALL HIGHLY DETAILED 1132 SCALE KITS SEND SASE FOR ILLUSTRATED ORDER FORM saoa FOR CATALOG WILLIAMS BROSI INC 181 PAWNEE ST SAN MARCOS CA 92069 wing plans four separate panels build tape down jig desired washout washin typical tip washout means tip leading edge approximately parallel front edge wing jig few minutes careful measuring will give exact amount skew Wing jigs really easy construct especially know hot-wire foam dont get RC flier demonstrate wing jig will need sturdy warp-free base usually use piece 3/4-inch birch plywood cut about halfinch wider wing chord about inch longer constant-chord jig want make four separate jigs panel cut bases approximately match taper panel Cut out /32 18 plywood ribs match bottom curve airfoil building single constant-chord jig need two identical ribs match root airfoil doing four separate jigs will need two roots four breaks two tips Any washin washout must built jig ribs like extend ribs slightly maybe inch front back making single constantchord jig dont want fool foam use plywood ribs cut good supply balsa ribs use medium /8 balsa space about 3/4 inch apart foam-filled jig cut expanded polystyrene foam approximate wing planform glue 3/4 plywood epoxy Now glue end ribs hotwire foam using plywood ribs guides dont want cut foam way just use long sanding stick sand foam flush plywood end ribs usually add strip balsa along front rear foam trim off flush Cover top jig piece 116 plywood using epoxy have also used 1/33 plywood /32 balsa jig surfaces like use lots pins go balsa usually give entire jig couple coats nonshnnking dope protect humidity last few jigs have added row /8 dowels along front rear base spaced about inch apart allows hook rubber bands over top jig hold leading trailing edges down during construction Next month well talk bit about actual building process including cutting ribs 4In April Model Aviation Aeronca Defender Doc Mathews CL World Championships report Bill Lee Rich von Lopez US FF Champs John Oldenkamp How-To Mounting On-Off Switch THE WOODPECKERTM First Convertible Multi-Purpose Covering Tool Pat Peed NOW YOU CAN COVER LIKE THE PROS No Bubbles Covering Looks Great Long After its Applied Film Over Film No Problem 114E WmDPRICFR easily converts allow apply trims choice See Hobby Dealer First Z m Only $1895 Visa & MIC AcceptedCA eaderrrs add 6775% sales lao Made ix USAFor orders Sreei Coesrrocton1-500-335-5602 VIrieiSflOta 07 y 50 COOs No Sags Works Iron-On Coverings No Need Use Any Prep Easy Use DIEWOODPRXER" will weaken integrity structure Send Check/Money Order Directly UNIQUE MODEL PRODUCTS PO Box 2229 Lake Arrowhead CA 92352-2229 rrforrrrariorr Coil 909 336-5602 FAX 909 336-2719 DEALER INQUIRIES WELCOME SPECIALIST IN CUSTOM COX TEE DEE & REED ENGINES 020S 049S 051S 074S & 09S ALL CUSTOM & STOCK PARTS AVAILABLE INDIVIDUALLY COMPETITION ACCESSORIES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF TUBING THREE BRANDS OF GLOW PLUGS HARD-TO-FIND HARDWARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 8 COLORS QUALITY DOPE BRUSHES 5 & 7 LOOP 114 RUBBERBANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 112A TEXACO PLAYBOY SR KIT 1/2A TEXACO ENGINES & PARTS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLATES & EPOXIES ORDER BY MAIL OR PHONE 619 728-4365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $395 STOCK ORDERS SHIPPED WITHIN 24 HRS Also. Traditional line non-idle bar Glow Plugs SIx Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $169 Swanson AssocIate PO Box 151 Wayne NJ c 7948 07470 MTMI March 1995 121 OUR REV-ur INVN UHY AVERAGES OVER 9000 PROPSIII IMMEDIATE SHIPMENT VISAJMC WrJball R/C Idle-Bar Glow Plugs Long Short $209 Only
Edition: Model Aviation - 1995/03
Page Numbers: 118, 119, 120, 121
FREE FLIGHT DURATION TIMER TUNING different clockwork timers available Eastern Europe Most use same gear mechanismcopied German Leica camera self-timer Self-timers need run 15 20 secondsjust long enough hit hutton jump picture free flight need things run five ten minutes means slowing things down lot makes timers much susceptible dirt doesnt take much bring timers screeching halt Cleaning timer keeping clean lot trouble lot less trouble building new airplane help whole process cleaning lubricating maintaining clockwork timer Ron Felix has put together Timers How-To Maintenance Text eight-page booklet Ron covers basic tools needed disassembly cleaning inspection polishing lubrication discusses techniques lightening timer basic timer mechanism mounted between two rectangular brass plates typical three-function Wakefield timer rectangular plates will weigh about 18 grams carefully sawing filing away plates overall weight can reduced about 14 grams Some commercially-available timers have already done So want move beyond squirting timer full WD-40 get Rons booklet $2 plus $1 postage Ron Felix Box 74 Solebury PA 18963 HTL course stands High Thrust Line Ive always soft spot heart head high thrustline power models first /2A Gas kits back mid-1950s Midwest T-Bird Vertical takeoffs VTOs very interesting wind until finally learned launch downwind model wouldnt flip over its back Although high-thrustline models have around 40 years havent noticed too new HTL designs Bruce Augustus surprised three-views photos Topgun FlJ design designed December 1989 same time Bruces Northern Light pylon FlJ Northern Light design took off literally Bruce neglected Topgun design few years Recently dusted off put AD 06 up front recovered wing stab tissue went flying result win FlJ FF Champs Lost Hills last Labor Day Construction conventional balsa-andtissue carbon- fiber reinforcements needed 340-square-inch wing spans about 50 inches uses wellproven Starduster 350 section Weight 220 grams Unlike other F1J designs does use autorudder autostab bunt Full-size plans complete building flying instructions available $12 postpaid United States Write Bruce Augustus Airlines Box 450 Sun Valley ID 83353 Tapered Wings Part Back aspect ratios single digits tapering wings didnt seem too terribly important could just cut out bunch identical ribs set leading trailing edge parallel build away wings get longer longer pressure competition requires higher higher performance tapered wings least tapered tips start make lot sense Since wing tip chord smaller 118 Model Aviation kwork timer brain todays high-tech FiBs Accurate consistent control model functions Danish Wakefield flier Jorgen Korsgaard builds high-tech carbon-fiber wings low-tech balsa wing jigs See text Tapered wings offer elegant aerodynamic alternative constant-chord wings Ron McBurnetts FiG fun will ff1111 IHIi 111111 14p ffli [I liii 0 JUL tt 21 K 4 N 0 U 7 N 0 1 Emj 1114 UIWRTENOW4E CLEAR PYLON N___________ 1 WING AREA 340 SO IN STAB AREA 103 SO IN 30% WT220 GR ENGINEAD 06 PROPELLER APC 57 x 3 FLY LEFT-LEFT TILT STAB FOR GLIDE BRUCE AUGUSTUS 12M9C 2 S-ill C r H1ADOER TER II\1PLU I/Il SICES TOEIY TIEER 37 TISSUE COVER2SThIPSIg ISIS CFTtPABOTTOtd 21-ill--- ill PYLON 1116 SIDES ill SO LONGERONS IllS PLY BUD N STAB T T FOR EFIG CE IIiHI T FUSE OT] 1116 FIN LEFT OFFSET March1995 119 1143 T1IRUST OFFSETS FRO14 WING NGINIT CG 10% OK SPARK & GLOW OK CUB COMET 049 MOHAWK CHIEF/ BANTAM OK BROWN CO-2 Onginal Factoty Parts Accessories Send $2 catalog OK ENGINES BOX 355 MOHAWK NY 13407 tapered wing constantchord wing same area vortex tip should less thus reducing drag perhaps importantly center gravity wing half will closer fuselage tips will lighter Just like light tail light tips make model lively airable handle disturbances stalling Just about bad thing about tapered wings harder build True some ways construct tapered wings quickly accurately First lets look wing planform typical polyhedral wing can have either constant-chord inner panels tapered tips four panels can tapered Normally double-tapered wings tips sharply tapered inner panels effort come close elliptical area distribution typical FAI power model might have root chord seven inches chord 61/2 inches break tip chord 4/2 inches Once have wing outline drawn need photocopy root airfoil down right length break tips right Well can theory Ive read lately suggests need reduce both camber thickness airfoil go root out tip Unfortunately means replotting airfoil suggestion decrease thickness camber same percentage chord reduced above example break chord 93% root chord 65 divided 7 tip chord 64% root chord 45 divided 7 need multiply root airfoil coordinates 93% give break coordinates 64% get tip airfoil coordinates have airfoil software programs takes few minutes run numbers Another method used Moscow glider fliers Sergei Makarov Mikhail Kochkarov reduce thickness camber half percent break another half percent tip other words 6% thick root airfoil would reduced 55% break 5% tip Although math might take few minutes further complication building undercambered tapered wings especially double-tapered wings need wing jigs basically curved building boards match undercamber wing eliminate need packing up front trailing edge scraps balsa have trying build undercambered wing flat building board Certain types construction such partially fully sheeted wings virtually impossible build undercambered wing jig simplest open-frame wing can built quickly accurately undercambered jig Remember talking about building wing both tapers width changes airfoil camber root tip So double-tapered wing going need separate undercamber jig panelfour wing constantchord inner panels tapered tips will need least three jigstwo tips main panel further complicate things will need decide exact wing washin washout build jig panel unsure exact wing washes need just want save time can just build constantchord undercamber jig thats long enough build main tip panel time curve jig will course match bottom surface wing root rib same end jig other Surprisingly curve jig will come very close matching bottom curve break tip airfoils plotted using either above methods Besides time money savings single constant-chord jig takes up much less room workshop what about washin washout Thats best part about constant-chord jig can build much little wash want simply skewing tapered panel jig simply cut up 120 Model Aviation MADE IN AMEIUCA GBLADE IMPORTED FROM ENGIAND FLOURESCENT FIBERGLASS ROTOR BLADES 60 SIZE 860 REFLEX BICONVEXSYMETRIC 11999 60 SIZE 680 SYMETRICAL11999 4048 FITS MOSKITOX-CELL 407499 30 SIZE8999 MINATURE AIRCRAFT XCELL 60 HEU KIT59999 X-CELL 80 CUSTOM KIT 94 VERSION69999 XCELL40 HEUCOPTER KIT40999 XCELL GAS NEW99999 S-CELL PRO NEW114999 XCELL PRO CONy KIT NEW36999 X-CELL 39 HEUCOPTER KIT .36999 CARL GOLDBERG MODELS SUKHOISU2614499 NEWIII1GER6O9499 SUPERCHIPMUNK10999 ULTIMATE 91-PLANE13099 EXTRA3W6O139POWER ..11999 -4 EXTENSIVE INVENTORY OF ROBBEISCHLUTER KITS & V SKYFLEX114993194 SKYFLEX 300 NEW!114993394 SKYFLEX V GLOW 12799 3205 WE ACCEPT VlSA MASTERCARD & DISCOVER CARDS WE GLADLY SHIP COD SHIPPING & HANDLING $699 PER KIT CONTINENTAL USA OTHER AREAS CALL KY RESIDENTS ADD 6% SALES TAX HOBBY HANGAR IS FULL SERVICE HOBBY SHOP WITH OVER 11000 ITEMS IN STOCK 1994 CATALOGS AVAILABLE CALL FOR YOURS TODAYI HOBBY HANGAR 153 LLOYD AVENUEFLORENCE KY 41942 6061293-5748 60612824868 FAX PRICES SUBJECT TO CHANGE AT ANY TIME 9111094AMA THE GOLDEN ERA OF AIR RACING LIVES NOW CAN OWN COLLECTION OF THE FAMOUS RACING PLANES OF THE 3C5 LIKE THE GEE BEE Z GEE BEE R1 HALL BuLLDOG WEDELL WILLIAMS AND CAUDRON RACER SCHOENFELOT FIRECRACKER ALL HIGHLY DETAILED 1132 SCALE KITS SEND SASE FOR ILLUSTRATED ORDER FORM saoa FOR CATALOG WILLIAMS BROSI INC 181 PAWNEE ST SAN MARCOS CA 92069 wing plans four separate panels build tape down jig desired washout washin typical tip washout means tip leading edge approximately parallel front edge wing jig few minutes careful measuring will give exact amount skew Wing jigs really easy construct especially know hot-wire foam dont get RC flier demonstrate wing jig will need sturdy warp-free base usually use piece 3/4-inch birch plywood cut about halfinch wider wing chord about inch longer constant-chord jig want make four separate jigs panel cut bases approximately match taper panel Cut out /32 18 plywood ribs match bottom curve airfoil building single constant-chord jig need two identical ribs match root airfoil doing four separate jigs will need two roots four breaks two tips Any washin washout must built jig ribs like extend ribs slightly maybe inch front back making single constantchord jig dont want fool foam use plywood ribs cut good supply balsa ribs use medium /8 balsa space about 3/4 inch apart foam-filled jig cut expanded polystyrene foam approximate wing planform glue 3/4 plywood epoxy Now glue end ribs hotwire foam using plywood ribs guides dont want cut foam way just use long sanding stick sand foam flush plywood end ribs usually add strip balsa along front rear foam trim off flush Cover top jig piece 116 plywood using epoxy have also used 1/33 plywood /32 balsa jig surfaces like use lots pins go balsa usually give entire jig couple coats nonshnnking dope protect humidity last few jigs have added row /8 dowels along front rear base spaced about inch apart allows hook rubber bands over top jig hold leading trailing edges down during construction Next month well talk bit about actual building process including cutting ribs 4In April Model Aviation Aeronca Defender Doc Mathews CL World Championships report Bill Lee Rich von Lopez US FF Champs John Oldenkamp How-To Mounting On-Off Switch THE WOODPECKERTM First Convertible Multi-Purpose Covering Tool Pat Peed NOW YOU CAN COVER LIKE THE PROS No Bubbles Covering Looks Great Long After its Applied Film Over Film No Problem 114E WmDPRICFR easily converts allow apply trims choice See Hobby Dealer First Z m Only $1895 Visa & MIC AcceptedCA eaderrrs add 6775% sales lao Made ix USAFor orders Sreei Coesrrocton1-500-335-5602 VIrieiSflOta 07 y 50 COOs No Sags Works Iron-On Coverings No Need Use Any Prep Easy Use DIEWOODPRXER" will weaken integrity structure Send Check/Money Order Directly UNIQUE MODEL PRODUCTS PO Box 2229 Lake Arrowhead CA 92352-2229 rrforrrrariorr Coil 909 336-5602 FAX 909 336-2719 DEALER INQUIRIES WELCOME SPECIALIST IN CUSTOM COX TEE DEE & REED ENGINES 020S 049S 051S 074S & 09S ALL CUSTOM & STOCK PARTS AVAILABLE INDIVIDUALLY COMPETITION ACCESSORIES RACING WHEELS KLOTZ OIL CARBON FIBER SOLID LINES ALL KINDS OF TUBING THREE BRANDS OF GLOW PLUGS HARD-TO-FIND HARDWARE OLD TIMER SUPPLIES COILS CONDENSERS NGK & STIlT SPARK PLUGS SILK 8 COLORS QUALITY DOPE BRUSHES 5 & 7 LOOP 114 RUBBERBANDS TRANSISTOR IGNITION SYSTEMS RESISTOR HIGH TENSION LEADS 112A TEXACO PLAYBOY SR KIT 1/2A TEXACO ENGINES & PARTS RUBBER POWER KITS PROPS TISSUE AND OTHER SUPPLIES CYANOACRYLATES & EPOXIES ORDER BY MAIL OR PHONE 619 728-4365 SORRY NO COD VISA & MASTERCARD WELCOME MINIMUM MERCHANDISE ORDER $1000 SHIPPING HANDLING AND INSURANCE FEE $395 STOCK ORDERS SHIPPED WITHIN 24 HRS Also. Traditional line non-idle bar Glow Plugs SIx Types 3 Heat Ranges High Performance Glow Element Blow Proof Seal Only $169 Swanson AssocIate PO Box 151 Wayne NJ c 7948 07470 MTMI March 1995 121 OUR REV-ur INVN UHY AVERAGES OVER 9000 PROPSIII IMMEDIATE SHIPMENT VISAJMC WrJball R/C Idle-Bar Glow Plugs Long Short $209 Only