THIS MONTHS TOPICS 1 Electric Connection Senice 2 Electric meets 3 Wiring connec tor losses 4 New speed controls 5 Electric technical journal 6 latest ElectricSenior Skyvolt 7 way view power YOURS asking Electric Connection Service Anyone club seeking Electric modelers immediate area need send info writing Ill print As Im writing column January 1990 issue has just appeared mailbox its first mentions service public large Ill hope time write column April issue Ill have reader input resulting January introduc tion Come know loners E-clubs out same nature preceding Id like offer some column space list annual Electric meets past several readers wanted schedule annual gatherings have inquired about other such known meets avoid schedule conflicts Thus Id like invite groups having such annual plans let know soon pos sible Ill pass info along right help start off ought know Annual KRC Electric Fly scheduled third weekend September year thats 15th 16th month Now leave Out anyone firstever event meets hold same nual date send info adequate rime Ill list also primary thrust however help major annual activities avoid collision since might presume nual meets knownbut just everyone Wiring connector power losses topic covered column back December 1987 Electric columns other model magazines about same date cov erage based some rather extensive work performed Keith Shaw shared sev eral writers work Keith measured losses several popular connectors wire types presented results Recently friend approached prob lem installation felt speed control causing loss about 1000 rpm co balt 15 full-on condition agreed check out What found such nor case Yes lot voltage loss installationabout volt speed control Very nearly loss connectors experience reminded Keiths work prompted some additional similar work particular connectors friends plane some use myself included Keiths original tables wanted get detailed info sake continuity heh repeated some Keith evaluated particulars experi ments follows wire use high-flexibility Jomar 16gauge recently upgraded 15-gauge con nector sets shown photos con nected series electronically regulated constant current 100 amps passed through string Straight pins stuck through wire insu lation serve voltage probes removed tiny holes left pins small pose no threat whatsoever far exposing inner conductors DVM digital voltmeter RMcM connected pins spaced six inches measure voltage drops connec tors located about middle sixinch spread pin set included straight length wire having no connector measured serve reference resulting value sub46 Model Aviation Rado Control Electrics Bob Kopski 25 West End Dr Lansdale PA 19446 Horak speed control custom crafted Canada Very compact design mounts easily mod ci Aluminum cover screws integral machined heeat sink Sermos connectors standard Jomars new SC-6 large system speed control handles 22 34 cellsjust right Astro 60 Note standard Sermos con nectors impressive circuit board Bobs new Senior Skyvolt L simple scale-up Skyvolt January 90 MAPlan No 639 $850 flies well very wide range power systems shown right Direct-drive 40 25 geared 15 Kopski builds modular power packs three six-packs two-pack 1200-mAh cells interconnected desired help wire nuts White foam pads fill voids planes battery area investigated voltage losses urnusome connectors tabu resutie months column Se- - of 6-in wires connectors straight pins stuck through insula 6 probes DVM Connec include top-to-bottom above n wire wire nut crimp pair Sermos Ta nd fuselcrimps set Detail typical probe setup seen below Pinholes iing Insulation after removing 0re too small matter can check Installation high-resistance ele using same techniqueonly j closer suspect connector Simple readings connector/wire test sam yield connector losses alone connec included wire nut male/female crimp Sermos Tamiya both conductors measured separately 25-amp ATC fuse connected crimped-on female connectors Measured calculated results follows TotalNet LossLoss mymy 6-in221221 wire Tamlys378157 379158 Sermos25938 Crimp150128 Fuse185163 Wire30482 nut Resistance Keiths milliohms Results mohons 442/ft444/ft 157 158 038 128 163 082 14 027 N/A N/A N/A Note i 0001 times Thus 082 millivolts 82 volts quite clear best connectors conto Sermos friend quite few pairs installationso can see problem may interest now drop across crimp speed control As always ver-necessary fuse will cost some loss no matter hat Finally lowly wire nut bad s cheapest connection market com readily available differences between results Continued page 141 Fully HALF crashes can traced dead dying receiver batteries New Plane Saver~ Applied Engineering warns low batteries flight letting safely land before losing control Installs seconds Compact Plane Saver 2 xl x 3/ unit fits neatly onboard weighs less 1 oz between receiver throttle servo battery capacity falls Plane Saver automatically lowers maximum throttle setting Thats signal bring unlike other systems Plane Saver gives throttle control up set point.all way down Very low power CMOS design ory set 46 volts can adlusted 44 to6 volts Works 4 5 cell packs capacity used servo normal reversed mode adjustment sets failsafe throttle limit 00/o 1 000/0 failsafe throttle works normally up set point ttle operates normally failsafe mode atible radios unit shipped tinned leads also available installed Futaba J connectors shown $800 additionalList price $3g95Introductory offer $2g95 APPLIED EIIGIrIEERIIIG 214 241-6060 PO Box 5100 Carrollton TX 75006 division Research Corporation Prices subiect change notice MOONEY 201 2 SCALE 70 SPAN 7/u 8/u LBS ENG 40 602 CYCLE 90 4 CYCLE Machine Cut Parts Balsa Kit l Size Plans Factory Approved 3 Views Jig Built Flying Surfaces $13995 Compiete Hardware ping Ply Capped Cowl Wing 9 Saddle & Surfaces Complete Construction Manual Complete Decals AYL order call write 7p GM Plastics Inc 7252 Industrial Park Blvd Mentor Ohio 44060 1216 953-1188 PILOT GLASSES. HOW VALUABLE IS YOUR EYESIGHT Adjustable side frames free-flow ventilation Extremely light weight added comfort Blocks harmful ultraviolet radiation Attractive case included Wraparound frame fits comfortably over prescription glasses tz mist coated scratch resistance Made entirely Polycarbonate impact protection ANSI Z871 specifications Available Clear shop work $1325 Amber overcast days & late afternoons S1405 Gray S14~ & Mirror S19~ sunny days CA Mask S15~ Paint Mask $2005 member club hit prop blade thrown 60 engine close range tip blade struck Safety Pius glasses saved him serious injury possibly loss eye incident convinced everyone should wear safety glasses near model airplane engines being run upEd Saul Secretary Treasurer Pikes Peak RC Club Prices include shipping handling PLU5 See hobby dealer first doesnt have what need order direct SAFETY PLUS PO Box 1173 Dept iM Clinton MS 39056 ORDERS ONLYi -800-842-7233 Cont US Mississippi 16011924-9640 IMC March 1990 47 oner later youll see need Celebrating 10 years producing largest selection giant scale kits available today Design building integrity scale fidelity scale flight characteristics standard IKON NWST 22 kits choose Conclusions research program sponsored AMA order gain better understanding propeller noise major objectives determine con tribution propeller makes over aircraft noise isolate main source prop noise latter proved significant establish guidelines would ulti mately lead quieter model aircraft opera tion combination propeller theory experimental data wind tun nel flight tests provided some definitive conclusions 1 In order reduce noise generated model aircraft dominant source must reduced Provided reasonable muffler used propeller domi nant noise source 2 The dominant source propeller noise torque noise Since efficient propellers generate thrust given amount required torque use will re sult less noise given airspeed 3 Propellers currently available mod elers general quite inefficient use such propellers leads less ideal performance acoustic characteris tics 4 Modelers should select propeller peak efficiency occurs near range airspeeds aircraft will usually operated general props increased pitch/diameter ratios must made available allow such integration wide variety aircraft 5 Noise reduction efforts should directed maximum flight speed condi tion way truly quantify noise attempt reduce mea sure flight 6 It possible develop propeller se lection method based in-flight experimental data addresses both noise performance would give aver age modeler means selecting prop would meet noise regulations performing satisfaction 7 This information will useful applied universally will job ganized groups such AMA clubs hobby dealers manufacturers edu cate individuals enforce proper pro cedures research study described series articles has disclosed nature prob lem propeller noise introduced some solutions Using efficient propellers will reduce model aircraft noise However continued research should directed toward studying effect propeller ge ometry overall efficiency should lead optimal blade designs ulti mately minimal propeller noise Finally carefully organized flight test program would provide data base developing standardized propeller selection criterion SAFE FLYING IS NO ACCIDENT Keithsgo latters numbers some known experimental error associated ex act measurement wire length involved physical portion wire near connector itself cases actual length somewhat intended six inches voltage drops would higher expected Whatever wary installation losses plane Use quality wire quality connectorsbut use sparingly Two new speed controls shown photos month First Jomars latesta large control big systems SC 6 mentioned upcoming new product December 1989 column now closer reality control pictured prototype designed operate 22- 34cell systems features new Signetics chip thats designed drive MOSFET metal-oxide semiconductor field-effect rransistorRMcM gates efficiently course its high-frame-rate design optically coupled Tentative list price $130 Joe Utazi tells product line will soon carried distributors across country competitive pricing will drive price other products down Another new control least new writer Horak imported Canada As understand controls handmade Jiri Horak 3403 Fellmore Drive Mississauga Ontar io Canada L5C 2E1 arc scarce supply Jiri makes several versions including ones brakesContinued page 144 March 1990 141 MOIIUUOUP VUA 114 SCALE 96 STITS PLAYBOYWACO UII-7 113 SCALE 88115 SCALE 72 RC Electrics/Kopski Continued page 47 SERIES 100 THP DESIGN ftN NEW d~7 CYCLE TAILORED HELICAL PITCH DEVELOPED TO GIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALLTHE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW DIA PITCH THP PRICE 1266/v778 136778 14677/z8 1567 16678 NEW PRO SERIES 3 NEW HIGH TECH AIRFOIL SECTION 10T020% INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUEL PROOF HIGH LUSTER FINISH DIA PITCHPRICE 534 634 72833456 833/4568 845667 1 94566477 p104566/e7 106W8W 10SEW 114677/77I8 115W 116EW 11/267 124W 125W 1256 1356 1456 164/zN 1556 16678 RC PYLON RACING SERIES 500 DIAPITCHPRICE 7 SN 5N SERIES 400C 86V26777 9777 W WIDE BLADE EW EXTRA WIDE N NARROW RC Electrics/Kopski Continued page 141 unit have loan CS Flight Systems SPC 30B means its up 30 amps has brake too optically coupled high-frame-rate design What really like enclosed super-compact design thats easy install Also circuitry coated protect adverse effects moisture Im flight testing unit now new Senior Skyvoltin between snowstorms Sorry have no pricing info Lynn Cromer wrote tell about hopes starting Electric technical journal words s lack good tech nical information regarding electric-powered model aircraft hes interested producing publication similar Soartech Lynn feels plenty technical topics delve deeply needs show interestand input end Im inviting interested readers contact Lynn 1148 Mt View Glen Heights TX 75115 tele 1-214/2300931 have Electric technical info share just interested potential publication send thoughts Lynn Im sure will keep up date progress turn will let everyone know through column new Senior Skyvolt pictured herein pure joy fly obviously scaled-up version smaller Skyvolt appeared January 1990 issue MA Full-Size Plan No 639 price $8SORMcM has 60-in-span 600-sq-in wing uses MACA 2412 airfoil section does original smaller version fuselage tail section construction very similar original wing LE sheeted top bottom form D-tube structure Skyvolt Sr designed accommodate geared 15 direct-drive 25s 40s Ive flown range systems handles extremely well em systems readily interchangeable because gener ous battery compartment plane utilizes versatile inner Goldenrod motor-mounting strap system thats worked well Electrics addition merely holding largest mo tor power packs 18 12 amp-hour cells 40size motors theres plenty battery compart ment space left over shift packs around purposes controlling CG Foam blocks used take up empty space battery reconfigured actual practice battery system uses three six-packs two-pack SCR cells Thus RONS MODELRadio Controlled BUILDINGAIrplanes Other Aircraft Boats 213 4514484 Build Ii Fly II can readily install 12 cells 14 cells 18 cells Interconnections among subpacks done wire nuts Like smaller Skyvolt cooling air scooped up under motor mount passed battery compartment under packs flows up among cells Out rear fuselage foam blocks fill up empty battery space assure cooling air forced among cells always did believe plenty cooling though packs can fully cooled five minutes flight simple blower placed air intake after land ing cools everything down few minutes hate taking packs out field cool em some additional details Sr Skyvolt its equipment installation complete empty framework landing gear weighs 215 oz LG making up 4Y3 oz total complete ready-to-fly wing assembly ai leron servo linkage etc weighs 12/2 oz complete covered planeincluding radio no power system componentsweighs 34 oz power systems tried far cobalt 40 18 12-amp-hour cells speed control wir ing prop spinner comprise total 51 oz 25-size motor 14 1 2-Ah cells stead its 41 oz geared 15 12 12s make total 36 oz Thus total flying weight ranges high 85 oz down 70 oz corresponding props have 10 x 6 9 x 6 11 x 75 detail Well thing some readers really interested Ive found out Ive failed give enough such info An other reason point want make Way back Electric series appeared several years ago magazine About Elec trics offered some rules thumb April 84 issue Rule Thumb #3 power system components average Electric 144 Model Aviation THE LEADER IN COMPETITION PROPELLERS 5 III J5 I~O209 2244170 p o box 5631fresno Cs 93755 Call Write 435 San Vicente Blvd J Santa Monica CA 90402 ri wORLDS BIGGEST SCALE PLANS DOCUMENTATION SERVICE 7 SCALE 00EL PLANS NO PACE CATALOG S,ESvs $000 US AC0 , Scot Psous uPon, Senvice PLANS ENLAROSUG3209 MadiSon Ave AeeneEoA N E 27032 MERLE DRESMETATION~S 5239 STARLITE ST PLIGHT TRAINERJ 13 WIIG SPAN HAPV-LM*401W GLI2BR E&SY TO PAL P1*4 TO FLY lSE FLIGHTS MftflP TAXED S -FIf MANUAL BALSA & NARIYAX200 KIT $595 l rae add 45% Isel weig JAMMAERO P0 Bce 171 AtI 23303 mccl 5041 824-OSM pIae inst $250 deepegdealar heqwue jewiGad make up about 50% total model weight Reasonable limits nominal figure 40% 60% other words 50 10 % power systems above comprise 60% 55% 52% respectively high-side-of-SO % figures typical aerobatic-type planes Per centages low side 50% typify Glider configurations See Some things dont change So far flight tests have occurred out side temperature range 320 400 mostly strong breeze flights have pure pleasure Like smaller version big Skyvolt handles very nicely inverted climbOuts position inverted loops very easy same goes loops square loops outside loops Immelmanns stall turns rolls etc Ground handling very good taildragger wonder some planes good some anything takeoff runs very shortshortest 40 course feel like building another just prove good per formance no accident previous discussion must surely raise some question some readers minds can same plane fly well both 15 40 Put simply its largely because terms like 15 40 mean absolutely nothing Heres way view matter Notice installations used 200mAh cells though 15 normally pack aged 900s Lets say want fly specific timea nice flight exactly five minutes Over course flight use speed control apply juice need outside loops inverted climbs whatever back off coals dont slow flybys average though current drain bat tery five minutes worth about 15 amps means motor input power aver age about 12 x 11 x 15 about 200 watts 15 about 18 x 11 x 15 watts 40a ratio 115 example same time total weight ratio 85/70 1121 should clear ac tual power spread applied combined range weights makes l5-to-40 gap seem very large Now dont want misunderstanding am saying 15 40 nearly equal 40 system can develop handle signifi cantly peak power plane can pull some maneuvers cant 15no doubt about What am saying given size nature plane way Ive described flying five minutes worth range power systems does very nice job speed control full plane docile IS much hotter 40 sorta middle 25 case its thoroughly enjoyable capable aerobatic average throttle used intelligently neededfor five minutes Notice comfortable viewed power point view opposed io guessing game associated OH FIVE kind useless nomenclature Can tell what OHFIVE Ive asked question before column no re plies Anyway Ive just described what can done right plane 200 300 watts wide range motors no matter what name go Electric rapidly maturing motor descriptions/specifications remain fancy can Electric enter its third decade such motor baby talk Watch out Lynn Cromerit aint gonna easy Now its back building cause spring comingI hope Please forward comment questions SASE please address shown column header Happy Electric Landings everyone RC Scale/Guenther Continued page 49 French Air Force Night Blue HD3lnterior cockpits crew compartments basically 1939-1941 Japanese Naval Air Force Light Grey Green N4 also Light Olive Green N5 bamboo Cockpit interiors crew compartments early types Once Japanese aircraft plants came un der severe attack aircraft began leave production lines Translucent Blue N16 18 Translucent Green N 17 interior aircraft meticulous detailing time energy effort put models cockpit isnt going amount hill beans March 1990 145 WIREMASTER bender/coiler extra large handle bends 118-114 coils & 32-3/16 music wire Wire creep elIminaIe ur ANTI-KREEP WIRE LOCKm ca1alo also has hardware accessories JOM COMPANY 114 WashIngton Terr Dept Waukegan IL 60085 WANTED RC AIRPLANES Et Used Engines Radios Jets Helicopters Flight Boxes RC Equipment basement entire hobly shop Phil Good 741-0433 Paid PO Box 362 Langhorne PA 19047
Edition: Model Aviation - 1990/03
Page Numbers: 46, 47, 141, 144, 145
THIS MONTHS TOPICS 1 Electric Connection Senice 2 Electric meets 3 Wiring connec tor losses 4 New speed controls 5 Electric technical journal 6 latest ElectricSenior Skyvolt 7 way view power YOURS asking Electric Connection Service Anyone club seeking Electric modelers immediate area need send info writing Ill print As Im writing column January 1990 issue has just appeared mailbox its first mentions service public large Ill hope time write column April issue Ill have reader input resulting January introduc tion Come know loners E-clubs out same nature preceding Id like offer some column space list annual Electric meets past several readers wanted schedule annual gatherings have inquired about other such known meets avoid schedule conflicts Thus Id like invite groups having such annual plans let know soon pos sible Ill pass info along right help start off ought know Annual KRC Electric Fly scheduled third weekend September year thats 15th 16th month Now leave Out anyone firstever event meets hold same nual date send info adequate rime Ill list also primary thrust however help major annual activities avoid collision since might presume nual meets knownbut just everyone Wiring connector power losses topic covered column back December 1987 Electric columns other model magazines about same date cov erage based some rather extensive work performed Keith Shaw shared sev eral writers work Keith measured losses several popular connectors wire types presented results Recently friend approached prob lem installation felt speed control causing loss about 1000 rpm co balt 15 full-on condition agreed check out What found such nor case Yes lot voltage loss installationabout volt speed control Very nearly loss connectors experience reminded Keiths work prompted some additional similar work particular connectors friends plane some use myself included Keiths original tables wanted get detailed info sake continuity heh repeated some Keith evaluated particulars experi ments follows wire use high-flexibility Jomar 16gauge recently upgraded 15-gauge con nector sets shown photos con nected series electronically regulated constant current 100 amps passed through string Straight pins stuck through wire insu lation serve voltage probes removed tiny holes left pins small pose no threat whatsoever far exposing inner conductors DVM digital voltmeter RMcM connected pins spaced six inches measure voltage drops connec tors located about middle sixinch spread pin set included straight length wire having no connector measured serve reference resulting value sub46 Model Aviation Rado Control Electrics Bob Kopski 25 West End Dr Lansdale PA 19446 Horak speed control custom crafted Canada Very compact design mounts easily mod ci Aluminum cover screws integral machined heeat sink Sermos connectors standard Jomars new SC-6 large system speed control handles 22 34 cellsjust right Astro 60 Note standard Sermos con nectors impressive circuit board Bobs new Senior Skyvolt L simple scale-up Skyvolt January 90 MAPlan No 639 $850 flies well very wide range power systems shown right Direct-drive 40 25 geared 15 Kopski builds modular power packs three six-packs two-pack 1200-mAh cells interconnected desired help wire nuts White foam pads fill voids planes battery area investigated voltage losses urnusome connectors tabu resutie months column Se- - of 6-in wires connectors straight pins stuck through insula 6 probes DVM Connec include top-to-bottom above n wire wire nut crimp pair Sermos Ta nd fuselcrimps set Detail typical probe setup seen below Pinholes iing Insulation after removing 0re too small matter can check Installation high-resistance ele using same techniqueonly j closer suspect connector Simple readings connector/wire test sam yield connector losses alone connec included wire nut male/female crimp Sermos Tamiya both conductors measured separately 25-amp ATC fuse connected crimped-on female connectors Measured calculated results follows TotalNet LossLoss mymy 6-in221221 wire Tamlys378157 379158 Sermos25938 Crimp150128 Fuse185163 Wire30482 nut Resistance Keiths milliohms Results mohons 442/ft444/ft 157 158 038 128 163 082 14 027 N/A N/A N/A Note i 0001 times Thus 082 millivolts 82 volts quite clear best connectors conto Sermos friend quite few pairs installationso can see problem may interest now drop across crimp speed control As always ver-necessary fuse will cost some loss no matter hat Finally lowly wire nut bad s cheapest connection market com readily available differences between results Continued page 141 Fully HALF crashes can traced dead dying receiver batteries New Plane Saver~ Applied Engineering warns low batteries flight letting safely land before losing control Installs seconds Compact Plane Saver 2 xl x 3/ unit fits neatly onboard weighs less 1 oz between receiver throttle servo battery capacity falls Plane Saver automatically lowers maximum throttle setting Thats signal bring unlike other systems Plane Saver gives throttle control up set point.all way down Very low power CMOS design ory set 46 volts can adlusted 44 to6 volts Works 4 5 cell packs capacity used servo normal reversed mode adjustment sets failsafe throttle limit 00/o 1 000/0 failsafe throttle works normally up set point ttle operates normally failsafe mode atible radios unit shipped tinned leads also available installed Futaba J connectors shown $800 additionalList price $3g95Introductory offer $2g95 APPLIED EIIGIrIEERIIIG 214 241-6060 PO Box 5100 Carrollton TX 75006 division Research Corporation Prices subiect change notice MOONEY 201 2 SCALE 70 SPAN 7/u 8/u LBS ENG 40 602 CYCLE 90 4 CYCLE Machine Cut Parts Balsa Kit l Size Plans Factory Approved 3 Views Jig Built Flying Surfaces $13995 Compiete Hardware ping Ply Capped Cowl Wing 9 Saddle & Surfaces Complete Construction Manual Complete Decals AYL order call write 7p GM Plastics Inc 7252 Industrial Park Blvd Mentor Ohio 44060 1216 953-1188 PILOT GLASSES. HOW VALUABLE IS YOUR EYESIGHT Adjustable side frames free-flow ventilation Extremely light weight added comfort Blocks harmful ultraviolet radiation Attractive case included Wraparound frame fits comfortably over prescription glasses tz mist coated scratch resistance Made entirely Polycarbonate impact protection ANSI Z871 specifications Available Clear shop work $1325 Amber overcast days & late afternoons S1405 Gray S14~ & Mirror S19~ sunny days CA Mask S15~ Paint Mask $2005 member club hit prop blade thrown 60 engine close range tip blade struck Safety Pius glasses saved him serious injury possibly loss eye incident convinced everyone should wear safety glasses near model airplane engines being run upEd Saul Secretary Treasurer Pikes Peak RC Club Prices include shipping handling PLU5 See hobby dealer first doesnt have what need order direct SAFETY PLUS PO Box 1173 Dept iM Clinton MS 39056 ORDERS ONLYi -800-842-7233 Cont US Mississippi 16011924-9640 IMC March 1990 47 oner later youll see need Celebrating 10 years producing largest selection giant scale kits available today Design building integrity scale fidelity scale flight characteristics standard IKON NWST 22 kits choose Conclusions research program sponsored AMA order gain better understanding propeller noise major objectives determine con tribution propeller makes over aircraft noise isolate main source prop noise latter proved significant establish guidelines would ulti mately lead quieter model aircraft opera tion combination propeller theory experimental data wind tun nel flight tests provided some definitive conclusions 1 In order reduce noise generated model aircraft dominant source must reduced Provided reasonable muffler used propeller domi nant noise source 2 The dominant source propeller noise torque noise Since efficient propellers generate thrust given amount required torque use will re sult less noise given airspeed 3 Propellers currently available mod elers general quite inefficient use such propellers leads less ideal performance acoustic characteris tics 4 Modelers should select propeller peak efficiency occurs near range airspeeds aircraft will usually operated general props increased pitch/diameter ratios must made available allow such integration wide variety aircraft 5 Noise reduction efforts should directed maximum flight speed condi tion way truly quantify noise attempt reduce mea sure flight 6 It possible develop propeller se lection method based in-flight experimental data addresses both noise performance would give aver age modeler means selecting prop would meet noise regulations performing satisfaction 7 This information will useful applied universally will job ganized groups such AMA clubs hobby dealers manufacturers edu cate individuals enforce proper pro cedures research study described series articles has disclosed nature prob lem propeller noise introduced some solutions Using efficient propellers will reduce model aircraft noise However continued research should directed toward studying effect propeller ge ometry overall efficiency should lead optimal blade designs ulti mately minimal propeller noise Finally carefully organized flight test program would provide data base developing standardized propeller selection criterion SAFE FLYING IS NO ACCIDENT Keithsgo latters numbers some known experimental error associated ex act measurement wire length involved physical portion wire near connector itself cases actual length somewhat intended six inches voltage drops would higher expected Whatever wary installation losses plane Use quality wire quality connectorsbut use sparingly Two new speed controls shown photos month First Jomars latesta large control big systems SC 6 mentioned upcoming new product December 1989 column now closer reality control pictured prototype designed operate 22- 34cell systems features new Signetics chip thats designed drive MOSFET metal-oxide semiconductor field-effect rransistorRMcM gates efficiently course its high-frame-rate design optically coupled Tentative list price $130 Joe Utazi tells product line will soon carried distributors across country competitive pricing will drive price other products down Another new control least new writer Horak imported Canada As understand controls handmade Jiri Horak 3403 Fellmore Drive Mississauga Ontar io Canada L5C 2E1 arc scarce supply Jiri makes several versions including ones brakesContinued page 144 March 1990 141 MOIIUUOUP VUA 114 SCALE 96 STITS PLAYBOYWACO UII-7 113 SCALE 88115 SCALE 72 RC Electrics/Kopski Continued page 47 SERIES 100 THP DESIGN ftN NEW d~7 CYCLE TAILORED HELICAL PITCH DEVELOPED TO GIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALLTHE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW DIA PITCH THP PRICE 1266/v778 136778 14677/z8 1567 16678 NEW PRO SERIES 3 NEW HIGH TECH AIRFOIL SECTION 10T020% INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUEL PROOF HIGH LUSTER FINISH DIA PITCHPRICE 534 634 72833456 833/4568 845667 1 94566477 p104566/e7 106W8W 10SEW 114677/77I8 115W 116EW 11/267 124W 125W 1256 1356 1456 164/zN 1556 16678 RC PYLON RACING SERIES 500 DIAPITCHPRICE 7 SN 5N SERIES 400C 86V26777 9777 W WIDE BLADE EW EXTRA WIDE N NARROW RC Electrics/Kopski Continued page 141 unit have loan CS Flight Systems SPC 30B means its up 30 amps has brake too optically coupled high-frame-rate design What really like enclosed super-compact design thats easy install Also circuitry coated protect adverse effects moisture Im flight testing unit now new Senior Skyvoltin between snowstorms Sorry have no pricing info Lynn Cromer wrote tell about hopes starting Electric technical journal words s lack good tech nical information regarding electric-powered model aircraft hes interested producing publication similar Soartech Lynn feels plenty technical topics delve deeply needs show interestand input end Im inviting interested readers contact Lynn 1148 Mt View Glen Heights TX 75115 tele 1-214/2300931 have Electric technical info share just interested potential publication send thoughts Lynn Im sure will keep up date progress turn will let everyone know through column new Senior Skyvolt pictured herein pure joy fly obviously scaled-up version smaller Skyvolt appeared January 1990 issue MA Full-Size Plan No 639 price $8SORMcM has 60-in-span 600-sq-in wing uses MACA 2412 airfoil section does original smaller version fuselage tail section construction very similar original wing LE sheeted top bottom form D-tube structure Skyvolt Sr designed accommodate geared 15 direct-drive 25s 40s Ive flown range systems handles extremely well em systems readily interchangeable because gener ous battery compartment plane utilizes versatile inner Goldenrod motor-mounting strap system thats worked well Electrics addition merely holding largest mo tor power packs 18 12 amp-hour cells 40size motors theres plenty battery compart ment space left over shift packs around purposes controlling CG Foam blocks used take up empty space battery reconfigured actual practice battery system uses three six-packs two-pack SCR cells Thus RONS MODELRadio Controlled BUILDINGAIrplanes Other Aircraft Boats 213 4514484 Build Ii Fly II can readily install 12 cells 14 cells 18 cells Interconnections among subpacks done wire nuts Like smaller Skyvolt cooling air scooped up under motor mount passed battery compartment under packs flows up among cells Out rear fuselage foam blocks fill up empty battery space assure cooling air forced among cells always did believe plenty cooling though packs can fully cooled five minutes flight simple blower placed air intake after land ing cools everything down few minutes hate taking packs out field cool em some additional details Sr Skyvolt its equipment installation complete empty framework landing gear weighs 215 oz LG making up 4Y3 oz total complete ready-to-fly wing assembly ai leron servo linkage etc weighs 12/2 oz complete covered planeincluding radio no power system componentsweighs 34 oz power systems tried far cobalt 40 18 12-amp-hour cells speed control wir ing prop spinner comprise total 51 oz 25-size motor 14 1 2-Ah cells stead its 41 oz geared 15 12 12s make total 36 oz Thus total flying weight ranges high 85 oz down 70 oz corresponding props have 10 x 6 9 x 6 11 x 75 detail Well thing some readers really interested Ive found out Ive failed give enough such info An other reason point want make Way back Electric series appeared several years ago magazine About Elec trics offered some rules thumb April 84 issue Rule Thumb #3 power system components average Electric 144 Model Aviation THE LEADER IN COMPETITION PROPELLERS 5 III J5 I~O209 2244170 p o box 5631fresno Cs 93755 Call Write 435 San Vicente Blvd J Santa Monica CA 90402 ri wORLDS BIGGEST SCALE PLANS DOCUMENTATION SERVICE 7 SCALE 00EL PLANS NO PACE CATALOG S,ESvs $000 US AC0 , Scot Psous uPon, Senvice PLANS ENLAROSUG3209 MadiSon Ave AeeneEoA N E 27032 MERLE DRESMETATION~S 5239 STARLITE ST PLIGHT TRAINERJ 13 WIIG SPAN HAPV-LM*401W GLI2BR E&SY TO PAL P1*4 TO FLY lSE FLIGHTS MftflP TAXED S -FIf MANUAL BALSA & NARIYAX200 KIT $595 l rae add 45% Isel weig JAMMAERO P0 Bce 171 AtI 23303 mccl 5041 824-OSM pIae inst $250 deepegdealar heqwue jewiGad make up about 50% total model weight Reasonable limits nominal figure 40% 60% other words 50 10 % power systems above comprise 60% 55% 52% respectively high-side-of-SO % figures typical aerobatic-type planes Per centages low side 50% typify Glider configurations See Some things dont change So far flight tests have occurred out side temperature range 320 400 mostly strong breeze flights have pure pleasure Like smaller version big Skyvolt handles very nicely inverted climbOuts position inverted loops very easy same goes loops square loops outside loops Immelmanns stall turns rolls etc Ground handling very good taildragger wonder some planes good some anything takeoff runs very shortshortest 40 course feel like building another just prove good per formance no accident previous discussion must surely raise some question some readers minds can same plane fly well both 15 40 Put simply its largely because terms like 15 40 mean absolutely nothing Heres way view matter Notice installations used 200mAh cells though 15 normally pack aged 900s Lets say want fly specific timea nice flight exactly five minutes Over course flight use speed control apply juice need outside loops inverted climbs whatever back off coals dont slow flybys average though current drain bat tery five minutes worth about 15 amps means motor input power aver age about 12 x 11 x 15 about 200 watts 15 about 18 x 11 x 15 watts 40a ratio 115 example same time total weight ratio 85/70 1121 should clear ac tual power spread applied combined range weights makes l5-to-40 gap seem very large Now dont want misunderstanding am saying 15 40 nearly equal 40 system can develop handle signifi cantly peak power plane can pull some maneuvers cant 15no doubt about What am saying given size nature plane way Ive described flying five minutes worth range power systems does very nice job speed control full plane docile IS much hotter 40 sorta middle 25 case its thoroughly enjoyable capable aerobatic average throttle used intelligently neededfor five minutes Notice comfortable viewed power point view opposed io guessing game associated OH FIVE kind useless nomenclature Can tell what OHFIVE Ive asked question before column no re plies Anyway Ive just described what can done right plane 200 300 watts wide range motors no matter what name go Electric rapidly maturing motor descriptions/specifications remain fancy can Electric enter its third decade such motor baby talk Watch out Lynn Cromerit aint gonna easy Now its back building cause spring comingI hope Please forward comment questions SASE please address shown column header Happy Electric Landings everyone RC Scale/Guenther Continued page 49 French Air Force Night Blue HD3lnterior cockpits crew compartments basically 1939-1941 Japanese Naval Air Force Light Grey Green N4 also Light Olive Green N5 bamboo Cockpit interiors crew compartments early types Once Japanese aircraft plants came un der severe attack aircraft began leave production lines Translucent Blue N16 18 Translucent Green N 17 interior aircraft meticulous detailing time energy effort put models cockpit isnt going amount hill beans March 1990 145 WIREMASTER bender/coiler extra large handle bends 118-114 coils & 32-3/16 music wire Wire creep elIminaIe ur ANTI-KREEP WIRE LOCKm ca1alo also has hardware accessories JOM COMPANY 114 WashIngton Terr Dept Waukegan IL 60085 WANTED RC AIRPLANES Et Used Engines Radios Jets Helicopters Flight Boxes RC Equipment basement entire hobly shop Phil Good 741-0433 Paid PO Box 362 Langhorne PA 19047
Edition: Model Aviation - 1990/03
Page Numbers: 46, 47, 141, 144, 145
THIS MONTHS TOPICS 1 Electric Connection Senice 2 Electric meets 3 Wiring connec tor losses 4 New speed controls 5 Electric technical journal 6 latest ElectricSenior Skyvolt 7 way view power YOURS asking Electric Connection Service Anyone club seeking Electric modelers immediate area need send info writing Ill print As Im writing column January 1990 issue has just appeared mailbox its first mentions service public large Ill hope time write column April issue Ill have reader input resulting January introduc tion Come know loners E-clubs out same nature preceding Id like offer some column space list annual Electric meets past several readers wanted schedule annual gatherings have inquired about other such known meets avoid schedule conflicts Thus Id like invite groups having such annual plans let know soon pos sible Ill pass info along right help start off ought know Annual KRC Electric Fly scheduled third weekend September year thats 15th 16th month Now leave Out anyone firstever event meets hold same nual date send info adequate rime Ill list also primary thrust however help major annual activities avoid collision since might presume nual meets knownbut just everyone Wiring connector power losses topic covered column back December 1987 Electric columns other model magazines about same date cov erage based some rather extensive work performed Keith Shaw shared sev eral writers work Keith measured losses several popular connectors wire types presented results Recently friend approached prob lem installation felt speed control causing loss about 1000 rpm co balt 15 full-on condition agreed check out What found such nor case Yes lot voltage loss installationabout volt speed control Very nearly loss connectors experience reminded Keiths work prompted some additional similar work particular connectors friends plane some use myself included Keiths original tables wanted get detailed info sake continuity heh repeated some Keith evaluated particulars experi ments follows wire use high-flexibility Jomar 16gauge recently upgraded 15-gauge con nector sets shown photos con nected series electronically regulated constant current 100 amps passed through string Straight pins stuck through wire insu lation serve voltage probes removed tiny holes left pins small pose no threat whatsoever far exposing inner conductors DVM digital voltmeter RMcM connected pins spaced six inches measure voltage drops connec tors located about middle sixinch spread pin set included straight length wire having no connector measured serve reference resulting value sub46 Model Aviation Rado Control Electrics Bob Kopski 25 West End Dr Lansdale PA 19446 Horak speed control custom crafted Canada Very compact design mounts easily mod ci Aluminum cover screws integral machined heeat sink Sermos connectors standard Jomars new SC-6 large system speed control handles 22 34 cellsjust right Astro 60 Note standard Sermos con nectors impressive circuit board Bobs new Senior Skyvolt L simple scale-up Skyvolt January 90 MAPlan No 639 $850 flies well very wide range power systems shown right Direct-drive 40 25 geared 15 Kopski builds modular power packs three six-packs two-pack 1200-mAh cells interconnected desired help wire nuts White foam pads fill voids planes battery area investigated voltage losses urnusome connectors tabu resutie months column Se- - of 6-in wires connectors straight pins stuck through insula 6 probes DVM Connec include top-to-bottom above n wire wire nut crimp pair Sermos Ta nd fuselcrimps set Detail typical probe setup seen below Pinholes iing Insulation after removing 0re too small matter can check Installation high-resistance ele using same techniqueonly j closer suspect connector Simple readings connector/wire test sam yield connector losses alone connec included wire nut male/female crimp Sermos Tamiya both conductors measured separately 25-amp ATC fuse connected crimped-on female connectors Measured calculated results follows TotalNet LossLoss mymy 6-in221221 wire Tamlys378157 379158 Sermos25938 Crimp150128 Fuse185163 Wire30482 nut Resistance Keiths milliohms Results mohons 442/ft444/ft 157 158 038 128 163 082 14 027 N/A N/A N/A Note i 0001 times Thus 082 millivolts 82 volts quite clear best connectors conto Sermos friend quite few pairs installationso can see problem may interest now drop across crimp speed control As always ver-necessary fuse will cost some loss no matter hat Finally lowly wire nut bad s cheapest connection market com readily available differences between results Continued page 141 Fully HALF crashes can traced dead dying receiver batteries New Plane Saver~ Applied Engineering warns low batteries flight letting safely land before losing control Installs seconds Compact Plane Saver 2 xl x 3/ unit fits neatly onboard weighs less 1 oz between receiver throttle servo battery capacity falls Plane Saver automatically lowers maximum throttle setting Thats signal bring unlike other systems Plane Saver gives throttle control up set point.all way down Very low power CMOS design ory set 46 volts can adlusted 44 to6 volts Works 4 5 cell packs capacity used servo normal reversed mode adjustment sets failsafe throttle limit 00/o 1 000/0 failsafe throttle works normally up set point ttle operates normally failsafe mode atible radios unit shipped tinned leads also available installed Futaba J connectors shown $800 additionalList price $3g95Introductory offer $2g95 APPLIED EIIGIrIEERIIIG 214 241-6060 PO Box 5100 Carrollton TX 75006 division Research Corporation Prices subiect change notice MOONEY 201 2 SCALE 70 SPAN 7/u 8/u LBS ENG 40 602 CYCLE 90 4 CYCLE Machine Cut Parts Balsa Kit l Size Plans Factory Approved 3 Views Jig Built Flying Surfaces $13995 Compiete Hardware ping Ply Capped Cowl Wing 9 Saddle & Surfaces Complete Construction Manual Complete Decals AYL order call write 7p GM Plastics Inc 7252 Industrial Park Blvd Mentor Ohio 44060 1216 953-1188 PILOT GLASSES. HOW VALUABLE IS YOUR EYESIGHT Adjustable side frames free-flow ventilation Extremely light weight added comfort Blocks harmful ultraviolet radiation Attractive case included Wraparound frame fits comfortably over prescription glasses tz mist coated scratch resistance Made entirely Polycarbonate impact protection ANSI Z871 specifications Available Clear shop work $1325 Amber overcast days & late afternoons S1405 Gray S14~ & Mirror S19~ sunny days CA Mask S15~ Paint Mask $2005 member club hit prop blade thrown 60 engine close range tip blade struck Safety Pius glasses saved him serious injury possibly loss eye incident convinced everyone should wear safety glasses near model airplane engines being run upEd Saul Secretary Treasurer Pikes Peak RC Club Prices include shipping handling PLU5 See hobby dealer first doesnt have what need order direct SAFETY PLUS PO Box 1173 Dept iM Clinton MS 39056 ORDERS ONLYi -800-842-7233 Cont US Mississippi 16011924-9640 IMC March 1990 47 oner later youll see need Celebrating 10 years producing largest selection giant scale kits available today Design building integrity scale fidelity scale flight characteristics standard IKON NWST 22 kits choose Conclusions research program sponsored AMA order gain better understanding propeller noise major objectives determine con tribution propeller makes over aircraft noise isolate main source prop noise latter proved significant establish guidelines would ulti mately lead quieter model aircraft opera tion combination propeller theory experimental data wind tun nel flight tests provided some definitive conclusions 1 In order reduce noise generated model aircraft dominant source must reduced Provided reasonable muffler used propeller domi nant noise source 2 The dominant source propeller noise torque noise Since efficient propellers generate thrust given amount required torque use will re sult less noise given airspeed 3 Propellers currently available mod elers general quite inefficient use such propellers leads less ideal performance acoustic characteris tics 4 Modelers should select propeller peak efficiency occurs near range airspeeds aircraft will usually operated general props increased pitch/diameter ratios must made available allow such integration wide variety aircraft 5 Noise reduction efforts should directed maximum flight speed condi tion way truly quantify noise attempt reduce mea sure flight 6 It possible develop propeller se lection method based in-flight experimental data addresses both noise performance would give aver age modeler means selecting prop would meet noise regulations performing satisfaction 7 This information will useful applied universally will job ganized groups such AMA clubs hobby dealers manufacturers edu cate individuals enforce proper pro cedures research study described series articles has disclosed nature prob lem propeller noise introduced some solutions Using efficient propellers will reduce model aircraft noise However continued research should directed toward studying effect propeller ge ometry overall efficiency should lead optimal blade designs ulti mately minimal propeller noise Finally carefully organized flight test program would provide data base developing standardized propeller selection criterion SAFE FLYING IS NO ACCIDENT Keithsgo latters numbers some known experimental error associated ex act measurement wire length involved physical portion wire near connector itself cases actual length somewhat intended six inches voltage drops would higher expected Whatever wary installation losses plane Use quality wire quality connectorsbut use sparingly Two new speed controls shown photos month First Jomars latesta large control big systems SC 6 mentioned upcoming new product December 1989 column now closer reality control pictured prototype designed operate 22- 34cell systems features new Signetics chip thats designed drive MOSFET metal-oxide semiconductor field-effect rransistorRMcM gates efficiently course its high-frame-rate design optically coupled Tentative list price $130 Joe Utazi tells product line will soon carried distributors across country competitive pricing will drive price other products down Another new control least new writer Horak imported Canada As understand controls handmade Jiri Horak 3403 Fellmore Drive Mississauga Ontar io Canada L5C 2E1 arc scarce supply Jiri makes several versions including ones brakesContinued page 144 March 1990 141 MOIIUUOUP VUA 114 SCALE 96 STITS PLAYBOYWACO UII-7 113 SCALE 88115 SCALE 72 RC Electrics/Kopski Continued page 47 SERIES 100 THP DESIGN ftN NEW d~7 CYCLE TAILORED HELICAL PITCH DEVELOPED TO GIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALLTHE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW DIA PITCH THP PRICE 1266/v778 136778 14677/z8 1567 16678 NEW PRO SERIES 3 NEW HIGH TECH AIRFOIL SECTION 10T020% INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUEL PROOF HIGH LUSTER FINISH DIA PITCHPRICE 534 634 72833456 833/4568 845667 1 94566477 p104566/e7 106W8W 10SEW 114677/77I8 115W 116EW 11/267 124W 125W 1256 1356 1456 164/zN 1556 16678 RC PYLON RACING SERIES 500 DIAPITCHPRICE 7 SN 5N SERIES 400C 86V26777 9777 W WIDE BLADE EW EXTRA WIDE N NARROW RC Electrics/Kopski Continued page 141 unit have loan CS Flight Systems SPC 30B means its up 30 amps has brake too optically coupled high-frame-rate design What really like enclosed super-compact design thats easy install Also circuitry coated protect adverse effects moisture Im flight testing unit now new Senior Skyvoltin between snowstorms Sorry have no pricing info Lynn Cromer wrote tell about hopes starting Electric technical journal words s lack good tech nical information regarding electric-powered model aircraft hes interested producing publication similar Soartech Lynn feels plenty technical topics delve deeply needs show interestand input end Im inviting interested readers contact Lynn 1148 Mt View Glen Heights TX 75115 tele 1-214/2300931 have Electric technical info share just interested potential publication send thoughts Lynn Im sure will keep up date progress turn will let everyone know through column new Senior Skyvolt pictured herein pure joy fly obviously scaled-up version smaller Skyvolt appeared January 1990 issue MA Full-Size Plan No 639 price $8SORMcM has 60-in-span 600-sq-in wing uses MACA 2412 airfoil section does original smaller version fuselage tail section construction very similar original wing LE sheeted top bottom form D-tube structure Skyvolt Sr designed accommodate geared 15 direct-drive 25s 40s Ive flown range systems handles extremely well em systems readily interchangeable because gener ous battery compartment plane utilizes versatile inner Goldenrod motor-mounting strap system thats worked well Electrics addition merely holding largest mo tor power packs 18 12 amp-hour cells 40size motors theres plenty battery compart ment space left over shift packs around purposes controlling CG Foam blocks used take up empty space battery reconfigured actual practice battery system uses three six-packs two-pack SCR cells Thus RONS MODELRadio Controlled BUILDINGAIrplanes Other Aircraft Boats 213 4514484 Build Ii Fly II can readily install 12 cells 14 cells 18 cells Interconnections among subpacks done wire nuts Like smaller Skyvolt cooling air scooped up under motor mount passed battery compartment under packs flows up among cells Out rear fuselage foam blocks fill up empty battery space assure cooling air forced among cells always did believe plenty cooling though packs can fully cooled five minutes flight simple blower placed air intake after land ing cools everything down few minutes hate taking packs out field cool em some additional details Sr Skyvolt its equipment installation complete empty framework landing gear weighs 215 oz LG making up 4Y3 oz total complete ready-to-fly wing assembly ai leron servo linkage etc weighs 12/2 oz complete covered planeincluding radio no power system componentsweighs 34 oz power systems tried far cobalt 40 18 12-amp-hour cells speed control wir ing prop spinner comprise total 51 oz 25-size motor 14 1 2-Ah cells stead its 41 oz geared 15 12 12s make total 36 oz Thus total flying weight ranges high 85 oz down 70 oz corresponding props have 10 x 6 9 x 6 11 x 75 detail Well thing some readers really interested Ive found out Ive failed give enough such info An other reason point want make Way back Electric series appeared several years ago magazine About Elec trics offered some rules thumb April 84 issue Rule Thumb #3 power system components average Electric 144 Model Aviation THE LEADER IN COMPETITION PROPELLERS 5 III J5 I~O209 2244170 p o box 5631fresno Cs 93755 Call Write 435 San Vicente Blvd J Santa Monica CA 90402 ri wORLDS BIGGEST SCALE PLANS DOCUMENTATION SERVICE 7 SCALE 00EL PLANS NO PACE CATALOG S,ESvs $000 US AC0 , Scot Psous uPon, Senvice PLANS ENLAROSUG3209 MadiSon Ave AeeneEoA N E 27032 MERLE DRESMETATION~S 5239 STARLITE ST PLIGHT TRAINERJ 13 WIIG SPAN HAPV-LM*401W GLI2BR E&SY TO PAL P1*4 TO FLY lSE FLIGHTS MftflP TAXED S -FIf MANUAL BALSA & NARIYAX200 KIT $595 l rae add 45% Isel weig JAMMAERO P0 Bce 171 AtI 23303 mccl 5041 824-OSM pIae inst $250 deepegdealar heqwue jewiGad make up about 50% total model weight Reasonable limits nominal figure 40% 60% other words 50 10 % power systems above comprise 60% 55% 52% respectively high-side-of-SO % figures typical aerobatic-type planes Per centages low side 50% typify Glider configurations See Some things dont change So far flight tests have occurred out side temperature range 320 400 mostly strong breeze flights have pure pleasure Like smaller version big Skyvolt handles very nicely inverted climbOuts position inverted loops very easy same goes loops square loops outside loops Immelmanns stall turns rolls etc Ground handling very good taildragger wonder some planes good some anything takeoff runs very shortshortest 40 course feel like building another just prove good per formance no accident previous discussion must surely raise some question some readers minds can same plane fly well both 15 40 Put simply its largely because terms like 15 40 mean absolutely nothing Heres way view matter Notice installations used 200mAh cells though 15 normally pack aged 900s Lets say want fly specific timea nice flight exactly five minutes Over course flight use speed control apply juice need outside loops inverted climbs whatever back off coals dont slow flybys average though current drain bat tery five minutes worth about 15 amps means motor input power aver age about 12 x 11 x 15 about 200 watts 15 about 18 x 11 x 15 watts 40a ratio 115 example same time total weight ratio 85/70 1121 should clear ac tual power spread applied combined range weights makes l5-to-40 gap seem very large Now dont want misunderstanding am saying 15 40 nearly equal 40 system can develop handle signifi cantly peak power plane can pull some maneuvers cant 15no doubt about What am saying given size nature plane way Ive described flying five minutes worth range power systems does very nice job speed control full plane docile IS much hotter 40 sorta middle 25 case its thoroughly enjoyable capable aerobatic average throttle used intelligently neededfor five minutes Notice comfortable viewed power point view opposed io guessing game associated OH FIVE kind useless nomenclature Can tell what OHFIVE Ive asked question before column no re plies Anyway Ive just described what can done right plane 200 300 watts wide range motors no matter what name go Electric rapidly maturing motor descriptions/specifications remain fancy can Electric enter its third decade such motor baby talk Watch out Lynn Cromerit aint gonna easy Now its back building cause spring comingI hope Please forward comment questions SASE please address shown column header Happy Electric Landings everyone RC Scale/Guenther Continued page 49 French Air Force Night Blue HD3lnterior cockpits crew compartments basically 1939-1941 Japanese Naval Air Force Light Grey Green N4 also Light Olive Green N5 bamboo Cockpit interiors crew compartments early types Once Japanese aircraft plants came un der severe attack aircraft began leave production lines Translucent Blue N16 18 Translucent Green N 17 interior aircraft meticulous detailing time energy effort put models cockpit isnt going amount hill beans March 1990 145 WIREMASTER bender/coiler extra large handle bends 118-114 coils & 32-3/16 music wire Wire creep elIminaIe ur ANTI-KREEP WIRE LOCKm ca1alo also has hardware accessories JOM COMPANY 114 WashIngton Terr Dept Waukegan IL 60085 WANTED RC AIRPLANES Et Used Engines Radios Jets Helicopters Flight Boxes RC Equipment basement entire hobly shop Phil Good 741-0433 Paid PO Box 362 Langhorne PA 19047
Edition: Model Aviation - 1990/03
Page Numbers: 46, 47, 141, 144, 145
THIS MONTHS TOPICS 1 Electric Connection Senice 2 Electric meets 3 Wiring connec tor losses 4 New speed controls 5 Electric technical journal 6 latest ElectricSenior Skyvolt 7 way view power YOURS asking Electric Connection Service Anyone club seeking Electric modelers immediate area need send info writing Ill print As Im writing column January 1990 issue has just appeared mailbox its first mentions service public large Ill hope time write column April issue Ill have reader input resulting January introduc tion Come know loners E-clubs out same nature preceding Id like offer some column space list annual Electric meets past several readers wanted schedule annual gatherings have inquired about other such known meets avoid schedule conflicts Thus Id like invite groups having such annual plans let know soon pos sible Ill pass info along right help start off ought know Annual KRC Electric Fly scheduled third weekend September year thats 15th 16th month Now leave Out anyone firstever event meets hold same nual date send info adequate rime Ill list also primary thrust however help major annual activities avoid collision since might presume nual meets knownbut just everyone Wiring connector power losses topic covered column back December 1987 Electric columns other model magazines about same date cov erage based some rather extensive work performed Keith Shaw shared sev eral writers work Keith measured losses several popular connectors wire types presented results Recently friend approached prob lem installation felt speed control causing loss about 1000 rpm co balt 15 full-on condition agreed check out What found such nor case Yes lot voltage loss installationabout volt speed control Very nearly loss connectors experience reminded Keiths work prompted some additional similar work particular connectors friends plane some use myself included Keiths original tables wanted get detailed info sake continuity heh repeated some Keith evaluated particulars experi ments follows wire use high-flexibility Jomar 16gauge recently upgraded 15-gauge con nector sets shown photos con nected series electronically regulated constant current 100 amps passed through string Straight pins stuck through wire insu lation serve voltage probes removed tiny holes left pins small pose no threat whatsoever far exposing inner conductors DVM digital voltmeter RMcM connected pins spaced six inches measure voltage drops connec tors located about middle sixinch spread pin set included straight length wire having no connector measured serve reference resulting value sub46 Model Aviation Rado Control Electrics Bob Kopski 25 West End Dr Lansdale PA 19446 Horak speed control custom crafted Canada Very compact design mounts easily mod ci Aluminum cover screws integral machined heeat sink Sermos connectors standard Jomars new SC-6 large system speed control handles 22 34 cellsjust right Astro 60 Note standard Sermos con nectors impressive circuit board Bobs new Senior Skyvolt L simple scale-up Skyvolt January 90 MAPlan No 639 $850 flies well very wide range power systems shown right Direct-drive 40 25 geared 15 Kopski builds modular power packs three six-packs two-pack 1200-mAh cells interconnected desired help wire nuts White foam pads fill voids planes battery area investigated voltage losses urnusome connectors tabu resutie months column Se- - of 6-in wires connectors straight pins stuck through insula 6 probes DVM Connec include top-to-bottom above n wire wire nut crimp pair Sermos Ta nd fuselcrimps set Detail typical probe setup seen below Pinholes iing Insulation after removing 0re too small matter can check Installation high-resistance ele using same techniqueonly j closer suspect connector Simple readings connector/wire test sam yield connector losses alone connec included wire nut male/female crimp Sermos Tamiya both conductors measured separately 25-amp ATC fuse connected crimped-on female connectors Measured calculated results follows TotalNet LossLoss mymy 6-in221221 wire Tamlys378157 379158 Sermos25938 Crimp150128 Fuse185163 Wire30482 nut Resistance Keiths milliohms Results mohons 442/ft444/ft 157 158 038 128 163 082 14 027 N/A N/A N/A Note i 0001 times Thus 082 millivolts 82 volts quite clear best connectors conto Sermos friend quite few pairs installationso can see problem may interest now drop across crimp speed control As always ver-necessary fuse will cost some loss no matter hat Finally lowly wire nut bad s cheapest connection market com readily available differences between results Continued page 141 Fully HALF crashes can traced dead dying receiver batteries New Plane Saver~ Applied Engineering warns low batteries flight letting safely land before losing control Installs seconds Compact Plane Saver 2 xl x 3/ unit fits neatly onboard weighs less 1 oz between receiver throttle servo battery capacity falls Plane Saver automatically lowers maximum throttle setting Thats signal bring unlike other systems Plane Saver gives throttle control up set point.all way down Very low power CMOS design ory set 46 volts can adlusted 44 to6 volts Works 4 5 cell packs capacity used servo normal reversed mode adjustment sets failsafe throttle limit 00/o 1 000/0 failsafe throttle works normally up set point ttle operates normally failsafe mode atible radios unit shipped tinned leads also available installed Futaba J connectors shown $800 additionalList price $3g95Introductory offer $2g95 APPLIED EIIGIrIEERIIIG 214 241-6060 PO Box 5100 Carrollton TX 75006 division Research Corporation Prices subiect change notice MOONEY 201 2 SCALE 70 SPAN 7/u 8/u LBS ENG 40 602 CYCLE 90 4 CYCLE Machine Cut Parts Balsa Kit l Size Plans Factory Approved 3 Views Jig Built Flying Surfaces $13995 Compiete Hardware ping Ply Capped Cowl Wing 9 Saddle & Surfaces Complete Construction Manual Complete Decals AYL order call write 7p GM Plastics Inc 7252 Industrial Park Blvd Mentor Ohio 44060 1216 953-1188 PILOT GLASSES. HOW VALUABLE IS YOUR EYESIGHT Adjustable side frames free-flow ventilation Extremely light weight added comfort Blocks harmful ultraviolet radiation Attractive case included Wraparound frame fits comfortably over prescription glasses tz mist coated scratch resistance Made entirely Polycarbonate impact protection ANSI Z871 specifications Available Clear shop work $1325 Amber overcast days & late afternoons S1405 Gray S14~ & Mirror S19~ sunny days CA Mask S15~ Paint Mask $2005 member club hit prop blade thrown 60 engine close range tip blade struck Safety Pius glasses saved him serious injury possibly loss eye incident convinced everyone should wear safety glasses near model airplane engines being run upEd Saul Secretary Treasurer Pikes Peak RC Club Prices include shipping handling PLU5 See hobby dealer first doesnt have what need order direct SAFETY PLUS PO Box 1173 Dept iM Clinton MS 39056 ORDERS ONLYi -800-842-7233 Cont US Mississippi 16011924-9640 IMC March 1990 47 oner later youll see need Celebrating 10 years producing largest selection giant scale kits available today Design building integrity scale fidelity scale flight characteristics standard IKON NWST 22 kits choose Conclusions research program sponsored AMA order gain better understanding propeller noise major objectives determine con tribution propeller makes over aircraft noise isolate main source prop noise latter proved significant establish guidelines would ulti mately lead quieter model aircraft opera tion combination propeller theory experimental data wind tun nel flight tests provided some definitive conclusions 1 In order reduce noise generated model aircraft dominant source must reduced Provided reasonable muffler used propeller domi nant noise source 2 The dominant source propeller noise torque noise Since efficient propellers generate thrust given amount required torque use will re sult less noise given airspeed 3 Propellers currently available mod elers general quite inefficient use such propellers leads less ideal performance acoustic characteris tics 4 Modelers should select propeller peak efficiency occurs near range airspeeds aircraft will usually operated general props increased pitch/diameter ratios must made available allow such integration wide variety aircraft 5 Noise reduction efforts should directed maximum flight speed condi tion way truly quantify noise attempt reduce mea sure flight 6 It possible develop propeller se lection method based in-flight experimental data addresses both noise performance would give aver age modeler means selecting prop would meet noise regulations performing satisfaction 7 This information will useful applied universally will job ganized groups such AMA clubs hobby dealers manufacturers edu cate individuals enforce proper pro cedures research study described series articles has disclosed nature prob lem propeller noise introduced some solutions Using efficient propellers will reduce model aircraft noise However continued research should directed toward studying effect propeller ge ometry overall efficiency should lead optimal blade designs ulti mately minimal propeller noise Finally carefully organized flight test program would provide data base developing standardized propeller selection criterion SAFE FLYING IS NO ACCIDENT Keithsgo latters numbers some known experimental error associated ex act measurement wire length involved physical portion wire near connector itself cases actual length somewhat intended six inches voltage drops would higher expected Whatever wary installation losses plane Use quality wire quality connectorsbut use sparingly Two new speed controls shown photos month First Jomars latesta large control big systems SC 6 mentioned upcoming new product December 1989 column now closer reality control pictured prototype designed operate 22- 34cell systems features new Signetics chip thats designed drive MOSFET metal-oxide semiconductor field-effect rransistorRMcM gates efficiently course its high-frame-rate design optically coupled Tentative list price $130 Joe Utazi tells product line will soon carried distributors across country competitive pricing will drive price other products down Another new control least new writer Horak imported Canada As understand controls handmade Jiri Horak 3403 Fellmore Drive Mississauga Ontar io Canada L5C 2E1 arc scarce supply Jiri makes several versions including ones brakesContinued page 144 March 1990 141 MOIIUUOUP VUA 114 SCALE 96 STITS PLAYBOYWACO UII-7 113 SCALE 88115 SCALE 72 RC Electrics/Kopski Continued page 47 SERIES 100 THP DESIGN ftN NEW d~7 CYCLE TAILORED HELICAL PITCH DEVELOPED TO GIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALLTHE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW DIA PITCH THP PRICE 1266/v778 136778 14677/z8 1567 16678 NEW PRO SERIES 3 NEW HIGH TECH AIRFOIL SECTION 10T020% INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUEL PROOF HIGH LUSTER FINISH DIA PITCHPRICE 534 634 72833456 833/4568 845667 1 94566477 p104566/e7 106W8W 10SEW 114677/77I8 115W 116EW 11/267 124W 125W 1256 1356 1456 164/zN 1556 16678 RC PYLON RACING SERIES 500 DIAPITCHPRICE 7 SN 5N SERIES 400C 86V26777 9777 W WIDE BLADE EW EXTRA WIDE N NARROW RC Electrics/Kopski Continued page 141 unit have loan CS Flight Systems SPC 30B means its up 30 amps has brake too optically coupled high-frame-rate design What really like enclosed super-compact design thats easy install Also circuitry coated protect adverse effects moisture Im flight testing unit now new Senior Skyvoltin between snowstorms Sorry have no pricing info Lynn Cromer wrote tell about hopes starting Electric technical journal words s lack good tech nical information regarding electric-powered model aircraft hes interested producing publication similar Soartech Lynn feels plenty technical topics delve deeply needs show interestand input end Im inviting interested readers contact Lynn 1148 Mt View Glen Heights TX 75115 tele 1-214/2300931 have Electric technical info share just interested potential publication send thoughts Lynn Im sure will keep up date progress turn will let everyone know through column new Senior Skyvolt pictured herein pure joy fly obviously scaled-up version smaller Skyvolt appeared January 1990 issue MA Full-Size Plan No 639 price $8SORMcM has 60-in-span 600-sq-in wing uses MACA 2412 airfoil section does original smaller version fuselage tail section construction very similar original wing LE sheeted top bottom form D-tube structure Skyvolt Sr designed accommodate geared 15 direct-drive 25s 40s Ive flown range systems handles extremely well em systems readily interchangeable because gener ous battery compartment plane utilizes versatile inner Goldenrod motor-mounting strap system thats worked well Electrics addition merely holding largest mo tor power packs 18 12 amp-hour cells 40size motors theres plenty battery compart ment space left over shift packs around purposes controlling CG Foam blocks used take up empty space battery reconfigured actual practice battery system uses three six-packs two-pack SCR cells Thus RONS MODELRadio Controlled BUILDINGAIrplanes Other Aircraft Boats 213 4514484 Build Ii Fly II can readily install 12 cells 14 cells 18 cells Interconnections among subpacks done wire nuts Like smaller Skyvolt cooling air scooped up under motor mount passed battery compartment under packs flows up among cells Out rear fuselage foam blocks fill up empty battery space assure cooling air forced among cells always did believe plenty cooling though packs can fully cooled five minutes flight simple blower placed air intake after land ing cools everything down few minutes hate taking packs out field cool em some additional details Sr Skyvolt its equipment installation complete empty framework landing gear weighs 215 oz LG making up 4Y3 oz total complete ready-to-fly wing assembly ai leron servo linkage etc weighs 12/2 oz complete covered planeincluding radio no power system componentsweighs 34 oz power systems tried far cobalt 40 18 12-amp-hour cells speed control wir ing prop spinner comprise total 51 oz 25-size motor 14 1 2-Ah cells stead its 41 oz geared 15 12 12s make total 36 oz Thus total flying weight ranges high 85 oz down 70 oz corresponding props have 10 x 6 9 x 6 11 x 75 detail Well thing some readers really interested Ive found out Ive failed give enough such info An other reason point want make Way back Electric series appeared several years ago magazine About Elec trics offered some rules thumb April 84 issue Rule Thumb #3 power system components average Electric 144 Model Aviation THE LEADER IN COMPETITION PROPELLERS 5 III J5 I~O209 2244170 p o box 5631fresno Cs 93755 Call Write 435 San Vicente Blvd J Santa Monica CA 90402 ri wORLDS BIGGEST SCALE PLANS DOCUMENTATION SERVICE 7 SCALE 00EL PLANS NO PACE CATALOG S,ESvs $000 US AC0 , Scot Psous uPon, Senvice PLANS ENLAROSUG3209 MadiSon Ave AeeneEoA N E 27032 MERLE DRESMETATION~S 5239 STARLITE ST PLIGHT TRAINERJ 13 WIIG SPAN HAPV-LM*401W GLI2BR E&SY TO PAL P1*4 TO FLY lSE FLIGHTS MftflP TAXED S -FIf MANUAL BALSA & NARIYAX200 KIT $595 l rae add 45% Isel weig JAMMAERO P0 Bce 171 AtI 23303 mccl 5041 824-OSM pIae inst $250 deepegdealar heqwue jewiGad make up about 50% total model weight Reasonable limits nominal figure 40% 60% other words 50 10 % power systems above comprise 60% 55% 52% respectively high-side-of-SO % figures typical aerobatic-type planes Per centages low side 50% typify Glider configurations See Some things dont change So far flight tests have occurred out side temperature range 320 400 mostly strong breeze flights have pure pleasure Like smaller version big Skyvolt handles very nicely inverted climbOuts position inverted loops very easy same goes loops square loops outside loops Immelmanns stall turns rolls etc Ground handling very good taildragger wonder some planes good some anything takeoff runs very shortshortest 40 course feel like building another just prove good per formance no accident previous discussion must surely raise some question some readers minds can same plane fly well both 15 40 Put simply its largely because terms like 15 40 mean absolutely nothing Heres way view matter Notice installations used 200mAh cells though 15 normally pack aged 900s Lets say want fly specific timea nice flight exactly five minutes Over course flight use speed control apply juice need outside loops inverted climbs whatever back off coals dont slow flybys average though current drain bat tery five minutes worth about 15 amps means motor input power aver age about 12 x 11 x 15 about 200 watts 15 about 18 x 11 x 15 watts 40a ratio 115 example same time total weight ratio 85/70 1121 should clear ac tual power spread applied combined range weights makes l5-to-40 gap seem very large Now dont want misunderstanding am saying 15 40 nearly equal 40 system can develop handle signifi cantly peak power plane can pull some maneuvers cant 15no doubt about What am saying given size nature plane way Ive described flying five minutes worth range power systems does very nice job speed control full plane docile IS much hotter 40 sorta middle 25 case its thoroughly enjoyable capable aerobatic average throttle used intelligently neededfor five minutes Notice comfortable viewed power point view opposed io guessing game associated OH FIVE kind useless nomenclature Can tell what OHFIVE Ive asked question before column no re plies Anyway Ive just described what can done right plane 200 300 watts wide range motors no matter what name go Electric rapidly maturing motor descriptions/specifications remain fancy can Electric enter its third decade such motor baby talk Watch out Lynn Cromerit aint gonna easy Now its back building cause spring comingI hope Please forward comment questions SASE please address shown column header Happy Electric Landings everyone RC Scale/Guenther Continued page 49 French Air Force Night Blue HD3lnterior cockpits crew compartments basically 1939-1941 Japanese Naval Air Force Light Grey Green N4 also Light Olive Green N5 bamboo Cockpit interiors crew compartments early types Once Japanese aircraft plants came un der severe attack aircraft began leave production lines Translucent Blue N16 18 Translucent Green N 17 interior aircraft meticulous detailing time energy effort put models cockpit isnt going amount hill beans March 1990 145 WIREMASTER bender/coiler extra large handle bends 118-114 coils & 32-3/16 music wire Wire creep elIminaIe ur ANTI-KREEP WIRE LOCKm ca1alo also has hardware accessories JOM COMPANY 114 WashIngton Terr Dept Waukegan IL 60085 WANTED RC AIRPLANES Et Used Engines Radios Jets Helicopters Flight Boxes RC Equipment basement entire hobly shop Phil Good 741-0433 Paid PO Box 362 Langhorne PA 19047
Edition: Model Aviation - 1990/03
Page Numbers: 46, 47, 141, 144, 145
THIS MONTHS TOPICS 1 Electric Connection Senice 2 Electric meets 3 Wiring connec tor losses 4 New speed controls 5 Electric technical journal 6 latest ElectricSenior Skyvolt 7 way view power YOURS asking Electric Connection Service Anyone club seeking Electric modelers immediate area need send info writing Ill print As Im writing column January 1990 issue has just appeared mailbox its first mentions service public large Ill hope time write column April issue Ill have reader input resulting January introduc tion Come know loners E-clubs out same nature preceding Id like offer some column space list annual Electric meets past several readers wanted schedule annual gatherings have inquired about other such known meets avoid schedule conflicts Thus Id like invite groups having such annual plans let know soon pos sible Ill pass info along right help start off ought know Annual KRC Electric Fly scheduled third weekend September year thats 15th 16th month Now leave Out anyone firstever event meets hold same nual date send info adequate rime Ill list also primary thrust however help major annual activities avoid collision since might presume nual meets knownbut just everyone Wiring connector power losses topic covered column back December 1987 Electric columns other model magazines about same date cov erage based some rather extensive work performed Keith Shaw shared sev eral writers work Keith measured losses several popular connectors wire types presented results Recently friend approached prob lem installation felt speed control causing loss about 1000 rpm co balt 15 full-on condition agreed check out What found such nor case Yes lot voltage loss installationabout volt speed control Very nearly loss connectors experience reminded Keiths work prompted some additional similar work particular connectors friends plane some use myself included Keiths original tables wanted get detailed info sake continuity heh repeated some Keith evaluated particulars experi ments follows wire use high-flexibility Jomar 16gauge recently upgraded 15-gauge con nector sets shown photos con nected series electronically regulated constant current 100 amps passed through string Straight pins stuck through wire insu lation serve voltage probes removed tiny holes left pins small pose no threat whatsoever far exposing inner conductors DVM digital voltmeter RMcM connected pins spaced six inches measure voltage drops connec tors located about middle sixinch spread pin set included straight length wire having no connector measured serve reference resulting value sub46 Model Aviation Rado Control Electrics Bob Kopski 25 West End Dr Lansdale PA 19446 Horak speed control custom crafted Canada Very compact design mounts easily mod ci Aluminum cover screws integral machined heeat sink Sermos connectors standard Jomars new SC-6 large system speed control handles 22 34 cellsjust right Astro 60 Note standard Sermos con nectors impressive circuit board Bobs new Senior Skyvolt L simple scale-up Skyvolt January 90 MAPlan No 639 $850 flies well very wide range power systems shown right Direct-drive 40 25 geared 15 Kopski builds modular power packs three six-packs two-pack 1200-mAh cells interconnected desired help wire nuts White foam pads fill voids planes battery area investigated voltage losses urnusome connectors tabu resutie months column Se- - of 6-in wires connectors straight pins stuck through insula 6 probes DVM Connec include top-to-bottom above n wire wire nut crimp pair Sermos Ta nd fuselcrimps set Detail typical probe setup seen below Pinholes iing Insulation after removing 0re too small matter can check Installation high-resistance ele using same techniqueonly j closer suspect connector Simple readings connector/wire test sam yield connector losses alone connec included wire nut male/female crimp Sermos Tamiya both conductors measured separately 25-amp ATC fuse connected crimped-on female connectors Measured calculated results follows TotalNet LossLoss mymy 6-in221221 wire Tamlys378157 379158 Sermos25938 Crimp150128 Fuse185163 Wire30482 nut Resistance Keiths milliohms Results mohons 442/ft444/ft 157 158 038 128 163 082 14 027 N/A N/A N/A Note i 0001 times Thus 082 millivolts 82 volts quite clear best connectors conto Sermos friend quite few pairs installationso can see problem may interest now drop across crimp speed control As always ver-necessary fuse will cost some loss no matter hat Finally lowly wire nut bad s cheapest connection market com readily available differences between results Continued page 141 Fully HALF crashes can traced dead dying receiver batteries New Plane Saver~ Applied Engineering warns low batteries flight letting safely land before losing control Installs seconds Compact Plane Saver 2 xl x 3/ unit fits neatly onboard weighs less 1 oz between receiver throttle servo battery capacity falls Plane Saver automatically lowers maximum throttle setting Thats signal bring unlike other systems Plane Saver gives throttle control up set point.all way down Very low power CMOS design ory set 46 volts can adlusted 44 to6 volts Works 4 5 cell packs capacity used servo normal reversed mode adjustment sets failsafe throttle limit 00/o 1 000/0 failsafe throttle works normally up set point ttle operates normally failsafe mode atible radios unit shipped tinned leads also available installed Futaba J connectors shown $800 additionalList price $3g95Introductory offer $2g95 APPLIED EIIGIrIEERIIIG 214 241-6060 PO Box 5100 Carrollton TX 75006 division Research Corporation Prices subiect change notice MOONEY 201 2 SCALE 70 SPAN 7/u 8/u LBS ENG 40 602 CYCLE 90 4 CYCLE Machine Cut Parts Balsa Kit l Size Plans Factory Approved 3 Views Jig Built Flying Surfaces $13995 Compiete Hardware ping Ply Capped Cowl Wing 9 Saddle & Surfaces Complete Construction Manual Complete Decals AYL order call write 7p GM Plastics Inc 7252 Industrial Park Blvd Mentor Ohio 44060 1216 953-1188 PILOT GLASSES. HOW VALUABLE IS YOUR EYESIGHT Adjustable side frames free-flow ventilation Extremely light weight added comfort Blocks harmful ultraviolet radiation Attractive case included Wraparound frame fits comfortably over prescription glasses tz mist coated scratch resistance Made entirely Polycarbonate impact protection ANSI Z871 specifications Available Clear shop work $1325 Amber overcast days & late afternoons S1405 Gray S14~ & Mirror S19~ sunny days CA Mask S15~ Paint Mask $2005 member club hit prop blade thrown 60 engine close range tip blade struck Safety Pius glasses saved him serious injury possibly loss eye incident convinced everyone should wear safety glasses near model airplane engines being run upEd Saul Secretary Treasurer Pikes Peak RC Club Prices include shipping handling PLU5 See hobby dealer first doesnt have what need order direct SAFETY PLUS PO Box 1173 Dept iM Clinton MS 39056 ORDERS ONLYi -800-842-7233 Cont US Mississippi 16011924-9640 IMC March 1990 47 oner later youll see need Celebrating 10 years producing largest selection giant scale kits available today Design building integrity scale fidelity scale flight characteristics standard IKON NWST 22 kits choose Conclusions research program sponsored AMA order gain better understanding propeller noise major objectives determine con tribution propeller makes over aircraft noise isolate main source prop noise latter proved significant establish guidelines would ulti mately lead quieter model aircraft opera tion combination propeller theory experimental data wind tun nel flight tests provided some definitive conclusions 1 In order reduce noise generated model aircraft dominant source must reduced Provided reasonable muffler used propeller domi nant noise source 2 The dominant source propeller noise torque noise Since efficient propellers generate thrust given amount required torque use will re sult less noise given airspeed 3 Propellers currently available mod elers general quite inefficient use such propellers leads less ideal performance acoustic characteris tics 4 Modelers should select propeller peak efficiency occurs near range airspeeds aircraft will usually operated general props increased pitch/diameter ratios must made available allow such integration wide variety aircraft 5 Noise reduction efforts should directed maximum flight speed condi tion way truly quantify noise attempt reduce mea sure flight 6 It possible develop propeller se lection method based in-flight experimental data addresses both noise performance would give aver age modeler means selecting prop would meet noise regulations performing satisfaction 7 This information will useful applied universally will job ganized groups such AMA clubs hobby dealers manufacturers edu cate individuals enforce proper pro cedures research study described series articles has disclosed nature prob lem propeller noise introduced some solutions Using efficient propellers will reduce model aircraft noise However continued research should directed toward studying effect propeller ge ometry overall efficiency should lead optimal blade designs ulti mately minimal propeller noise Finally carefully organized flight test program would provide data base developing standardized propeller selection criterion SAFE FLYING IS NO ACCIDENT Keithsgo latters numbers some known experimental error associated ex act measurement wire length involved physical portion wire near connector itself cases actual length somewhat intended six inches voltage drops would higher expected Whatever wary installation losses plane Use quality wire quality connectorsbut use sparingly Two new speed controls shown photos month First Jomars latesta large control big systems SC 6 mentioned upcoming new product December 1989 column now closer reality control pictured prototype designed operate 22- 34cell systems features new Signetics chip thats designed drive MOSFET metal-oxide semiconductor field-effect rransistorRMcM gates efficiently course its high-frame-rate design optically coupled Tentative list price $130 Joe Utazi tells product line will soon carried distributors across country competitive pricing will drive price other products down Another new control least new writer Horak imported Canada As understand controls handmade Jiri Horak 3403 Fellmore Drive Mississauga Ontar io Canada L5C 2E1 arc scarce supply Jiri makes several versions including ones brakesContinued page 144 March 1990 141 MOIIUUOUP VUA 114 SCALE 96 STITS PLAYBOYWACO UII-7 113 SCALE 88115 SCALE 72 RC Electrics/Kopski Continued page 47 SERIES 100 THP DESIGN ftN NEW d~7 CYCLE TAILORED HELICAL PITCH DEVELOPED TO GIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALLTHE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW DIA PITCH THP PRICE 1266/v778 136778 14677/z8 1567 16678 NEW PRO SERIES 3 NEW HIGH TECH AIRFOIL SECTION 10T020% INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUEL PROOF HIGH LUSTER FINISH DIA PITCHPRICE 534 634 72833456 833/4568 845667 1 94566477 p104566/e7 106W8W 10SEW 114677/77I8 115W 116EW 11/267 124W 125W 1256 1356 1456 164/zN 1556 16678 RC PYLON RACING SERIES 500 DIAPITCHPRICE 7 SN 5N SERIES 400C 86V26777 9777 W WIDE BLADE EW EXTRA WIDE N NARROW RC Electrics/Kopski Continued page 141 unit have loan CS Flight Systems SPC 30B means its up 30 amps has brake too optically coupled high-frame-rate design What really like enclosed super-compact design thats easy install Also circuitry coated protect adverse effects moisture Im flight testing unit now new Senior Skyvoltin between snowstorms Sorry have no pricing info Lynn Cromer wrote tell about hopes starting Electric technical journal words s lack good tech nical information regarding electric-powered model aircraft hes interested producing publication similar Soartech Lynn feels plenty technical topics delve deeply needs show interestand input end Im inviting interested readers contact Lynn 1148 Mt View Glen Heights TX 75115 tele 1-214/2300931 have Electric technical info share just interested potential publication send thoughts Lynn Im sure will keep up date progress turn will let everyone know through column new Senior Skyvolt pictured herein pure joy fly obviously scaled-up version smaller Skyvolt appeared January 1990 issue MA Full-Size Plan No 639 price $8SORMcM has 60-in-span 600-sq-in wing uses MACA 2412 airfoil section does original smaller version fuselage tail section construction very similar original wing LE sheeted top bottom form D-tube structure Skyvolt Sr designed accommodate geared 15 direct-drive 25s 40s Ive flown range systems handles extremely well em systems readily interchangeable because gener ous battery compartment plane utilizes versatile inner Goldenrod motor-mounting strap system thats worked well Electrics addition merely holding largest mo tor power packs 18 12 amp-hour cells 40size motors theres plenty battery compart ment space left over shift packs around purposes controlling CG Foam blocks used take up empty space battery reconfigured actual practice battery system uses three six-packs two-pack SCR cells Thus RONS MODELRadio Controlled BUILDINGAIrplanes Other Aircraft Boats 213 4514484 Build Ii Fly II can readily install 12 cells 14 cells 18 cells Interconnections among subpacks done wire nuts Like smaller Skyvolt cooling air scooped up under motor mount passed battery compartment under packs flows up among cells Out rear fuselage foam blocks fill up empty battery space assure cooling air forced among cells always did believe plenty cooling though packs can fully cooled five minutes flight simple blower placed air intake after land ing cools everything down few minutes hate taking packs out field cool em some additional details Sr Skyvolt its equipment installation complete empty framework landing gear weighs 215 oz LG making up 4Y3 oz total complete ready-to-fly wing assembly ai leron servo linkage etc weighs 12/2 oz complete covered planeincluding radio no power system componentsweighs 34 oz power systems tried far cobalt 40 18 12-amp-hour cells speed control wir ing prop spinner comprise total 51 oz 25-size motor 14 1 2-Ah cells stead its 41 oz geared 15 12 12s make total 36 oz Thus total flying weight ranges high 85 oz down 70 oz corresponding props have 10 x 6 9 x 6 11 x 75 detail Well thing some readers really interested Ive found out Ive failed give enough such info An other reason point want make Way back Electric series appeared several years ago magazine About Elec trics offered some rules thumb April 84 issue Rule Thumb #3 power system components average Electric 144 Model Aviation THE LEADER IN COMPETITION PROPELLERS 5 III J5 I~O209 2244170 p o box 5631fresno Cs 93755 Call Write 435 San Vicente Blvd J Santa Monica CA 90402 ri wORLDS BIGGEST SCALE PLANS DOCUMENTATION SERVICE 7 SCALE 00EL PLANS NO PACE CATALOG S,ESvs $000 US AC0 , Scot Psous uPon, Senvice PLANS ENLAROSUG3209 MadiSon Ave AeeneEoA N E 27032 MERLE DRESMETATION~S 5239 STARLITE ST PLIGHT TRAINERJ 13 WIIG SPAN HAPV-LM*401W GLI2BR E&SY TO PAL P1*4 TO FLY lSE FLIGHTS MftflP TAXED S -FIf MANUAL BALSA & NARIYAX200 KIT $595 l rae add 45% Isel weig JAMMAERO P0 Bce 171 AtI 23303 mccl 5041 824-OSM pIae inst $250 deepegdealar heqwue jewiGad make up about 50% total model weight Reasonable limits nominal figure 40% 60% other words 50 10 % power systems above comprise 60% 55% 52% respectively high-side-of-SO % figures typical aerobatic-type planes Per centages low side 50% typify Glider configurations See Some things dont change So far flight tests have occurred out side temperature range 320 400 mostly strong breeze flights have pure pleasure Like smaller version big Skyvolt handles very nicely inverted climbOuts position inverted loops very easy same goes loops square loops outside loops Immelmanns stall turns rolls etc Ground handling very good taildragger wonder some planes good some anything takeoff runs very shortshortest 40 course feel like building another just prove good per formance no accident previous discussion must surely raise some question some readers minds can same plane fly well both 15 40 Put simply its largely because terms like 15 40 mean absolutely nothing Heres way view matter Notice installations used 200mAh cells though 15 normally pack aged 900s Lets say want fly specific timea nice flight exactly five minutes Over course flight use speed control apply juice need outside loops inverted climbs whatever back off coals dont slow flybys average though current drain bat tery five minutes worth about 15 amps means motor input power aver age about 12 x 11 x 15 about 200 watts 15 about 18 x 11 x 15 watts 40a ratio 115 example same time total weight ratio 85/70 1121 should clear ac tual power spread applied combined range weights makes l5-to-40 gap seem very large Now dont want misunderstanding am saying 15 40 nearly equal 40 system can develop handle signifi cantly peak power plane can pull some maneuvers cant 15no doubt about What am saying given size nature plane way Ive described flying five minutes worth range power systems does very nice job speed control full plane docile IS much hotter 40 sorta middle 25 case its thoroughly enjoyable capable aerobatic average throttle used intelligently neededfor five minutes Notice comfortable viewed power point view opposed io guessing game associated OH FIVE kind useless nomenclature Can tell what OHFIVE Ive asked question before column no re plies Anyway Ive just described what can done right plane 200 300 watts wide range motors no matter what name go Electric rapidly maturing motor descriptions/specifications remain fancy can Electric enter its third decade such motor baby talk Watch out Lynn Cromerit aint gonna easy Now its back building cause spring comingI hope Please forward comment questions SASE please address shown column header Happy Electric Landings everyone RC Scale/Guenther Continued page 49 French Air Force Night Blue HD3lnterior cockpits crew compartments basically 1939-1941 Japanese Naval Air Force Light Grey Green N4 also Light Olive Green N5 bamboo Cockpit interiors crew compartments early types Once Japanese aircraft plants came un der severe attack aircraft began leave production lines Translucent Blue N16 18 Translucent Green N 17 interior aircraft meticulous detailing time energy effort put models cockpit isnt going amount hill beans March 1990 145 WIREMASTER bender/coiler extra large handle bends 118-114 coils & 32-3/16 music wire Wire creep elIminaIe ur ANTI-KREEP WIRE LOCKm ca1alo also has hardware accessories JOM COMPANY 114 WashIngton Terr Dept Waukegan IL 60085 WANTED RC AIRPLANES Et Used Engines Radios Jets Helicopters Flight Boxes RC Equipment basement entire hobly shop Phil Good 741-0433 Paid PO Box 362 Langhorne PA 19047