Free Flight INDOOR Bud Tenny PROP PITCH DESIGN Last time began design discussion prop pitch defined pitch blade element Pitch 6 x tangent blade angle x diameter prop blade element Lets examine different light begin assume examin ing blade element 5-in radius 10-in diameter addition must consider prop rpm model flight velocity fairly typical combina tion could 50 rpm 2 ft/sec velocity Working 50 rpm 24 in/scc velocity can construct triangle like shown Figure 1 base triangle represents distance traveled blade element second model movingor advancing forward 26 MODEL ADVANCE ANGLE H00 ANGLE OF ATTACK advance angle Indoor model can graphically determined flight speed prop rpm See text / / / / / / / / / / / 0/ NEW PITCH / Once advance angle known required prop pitch can calculated shown PITcH flito,ce Trvekd BIde EIenent/Seo 10 x 31616 x 5/6 24 other words second flying model advances 24 prop 50 rpm makes 5/6 revolution Since blade element 10 diameter element will move 10 x 31416 x5/6 rev 262 circular path model moves forward 24 construct scale triangle dimensions 262 units base 24 units side hypotenuse triangle forms angle equal Arc Tan 24/262 4260 Another way expressing say propeller has advance angle 4260 prop blade has 00 angle attack angle blade element 10 diameter would 4260 equal 288 pitch However usually expected prop blade will Continued page 161 68 Model Aviation Stan Chlltons rubber gluing apparatus motor stretched tightly between drum right surgical hemostats left Tenny photo Business end motor gluing apparatus Note arrangement motor ends clamp Tenny photo Once motor Ii stretched lightly lubricated will tied carpet thread used tie motor ends together See text details Tenny photo -~IASTEII AIRSCRIW PRESENTS BALSA STRIPPER 4 ER PRECISION STRIP WOOD ro S FROM BALSA SHEET ALSO FOR DRAFTING AND PHOTO MATS USES TYPE II BLADE SUPER TOOLGREAT PRICE WINDSOR PROPELLER CO 384 Tesconi Ct. Santa Rosa CA 95401 LEADER IN SMALL AIRFOIL TECHNOLOGY MiISIE1I iIIRSCREW IMPROVED THROUGH FOUR YEARS OF PRODUCTION THE G/F SERIES IS UNEQUALED FOR PERFORMANCE & DURABILITY AVAILABLE WORLDWIDE THROUGH 131 DISTRIBUTORS WINDSOR PROPELLER CO 384 Tesconi Ct suppose could happen MA editorial staff believed sort thing hasnt happened occasions particularly snotty remark aimed someone outside AMA management something really isnt appro priate subject column has deleted what see essentially what have written what see within quotation marks authored someone else has rewritten usually hope making bit clear better worse think ultimate nonsensicalness editorial we/our/us syndrome reached recent article author made reference fe Bob Meuser 4200 Gregory St Oakland CA 94619 FF Indoor/Tenny Continued oaae 68 operate about 70 angle attack illustrated Figure 2 work backwards through formula will find blade angle 4260 960 equal 369 pitch sum up model flies 24 per second have computed pitch 369 will give 50 rpm under conditions Thats too much trouble Well probably until need win World Championships However use 32-in pitch prop get model up its first flights can make flight tests measurements determine what next prop should final analysis model should trimmed minimum forward velocity allows reliable flight under given conditions air turbulent will necessary model fly faster order avoid stalling stumbling around loses flight time Similarly extragood conditions will allow safe slower flight As trim model slower flight rpm will also drop thus giving longer flight time since rubber unwinds slowly fast does modeivj7v Once have model trimmed just way want put enough turns model will climb about 10 ft above launch point level out help friend mark floor show opposite edges flight circle time long model takes make several circles flying level just after stops climbing Measure circle diameter marks floor compute circumference use time per lap compute average flight velocity use another stopwatch tomeasure rpm same time will able figure advance angle check prop perform ance Make careful flight performance records change different prop try again After making few systematic records will soon begin to~ zero what required improve models performance After well way winning contests Glue knot some time small number fliers have gluing Indoor motors together instead tying ends us have done years Im sure started using glue first place Pete Andrews made motors way 1972 Indoor World Champs Stan Chilton well known special fixtures motor gluing rig representative what does photos gives overview Stans HOBBYHI5EAWAYHO85yHIDEAWAYHOBByH15EWAYROEByRTflEAWAy FAMOUS BRITISH DIESELS AEROMODELLER PLANS CATALOG-DIESEL HANDBOOK $350 pp SPARES FOR M/E PAW D/C 2nd EDITION July 1982 161 Santa Rosa CA 95401 0- 0 0 On-Board Starting System Its No Longer Luxury Eastcrafts Lectra Starter Systems realistic practical important prevent injuries caused hand cranking engine Most systems available stock Also available marine applications Send $1 complete catalog EASTC RAFT Specialty Products PO Box 508-MA Irwin PA 15642 412 864-4959 HOBBY HIDEWAY1DELAVANIL 309 244-7389 61734 HCBBYHJDEAWMHOBBYHIDEAWAYHOBEVHT5EAWAYIIO55VHIDEW OR RC BUMP SIX PUFF LONG ciii ckhghfud liiia i cr itpvd N f /1I mnautiiriiirs u/Ireintiidoiis/iiii Li dali,, super/oh thazci lot firtoiirci ideal tcieSI iiideiiAiiieriiitA DOCUMENTED FROM CUSTOMERS UNSOLICITED LElTERS Electric powered / solid-state proportional contrOl / no servos / no mechanical switches linkages/reliable/ trouble-f ree Use standard 3 chan transmitter & receiver/ use single 48 volt battery / flies 1 hour 500 mah Three independently controlled reversible electric thrus ters give precise guidance airspeeds / smallest space Straight up/down climb/dive Standing pivot turns Reduced power/single engine maneuvers 0 4 mph forward/back KIT Prefabricated gas bag motors propellers Pre-cut balsa foam parts decals motor control printed cir cuit board components assembled Fly yourtrans rec 48v ba LTAB1K 5180 FACTORY BUILT Same Kit factory assembled Simply fill Heitium fly trans rec 48v ba LTA61KB 5235 FACTORY BUILT WiTh BUILT-IN RECEIVER customized trans specify make & frog LTA61KBR $335 White bag standard Satin silver bag available factory built units add $20 Custom screening available welding supply shops Order Prepaid pay shippingi COD DEALER INOUIRIES EVITED LTA SYSTEMS OSMOND LANE O UTAH 84604 PENNSYLVANIA AVENUE RADIO CONTROL SOCIETY % %ah YEa%tn% 15th Annual Giant & Sport Scale Competition! Registration 830-1130 am Flying starts 830 am Sunday July 18 1982 Floyd Bennett Field Brooklyn NY Largest Controlled Model Air Park New York State SPORT SCALE GIANT SCALE Separate Judging Giant Scale y Fee $23 First Event $15 Second Entry $3 goes US Scale Masters Fund Contest Director Jerry Behrens 31-27 Healy Ave Far Rockaway NY 11691 212-337-6987 motor gluing apparatus showing motor ready made up left can see surgical hemostat holding two ends motor motor stretched around drum right drum used winch motor being wrapped holds itself drum top drum visible top peg drops hole fixtures base preventing * ** *WANDITTM p. PLr *Oealers Invited * * oliC year warrafltfhin * *CORD * * WetorOry * Stick Abrasives * A Keen Machine giees exceptional nding control excellent finish asic mcI 1 flat Wand 1 *of S grits *10895Builder Special mcI 2 flat 1 half *round vjand 5 6 grits *1295Deluse includes 3 flat 2 half *rsund wands buff wands *10 6 grits * *Additional Wands Abrasives avarlable *See local hubby shop * ADDIS ELMORE Eve No 214 280 5705 *PO Box 266 uite tenas 75149 * US SCALE MASTERS REGIONAL QUALIFYING COMPETITION DS TO 5th PLACE Both Catagorias FREE REFRESHMENTS Contestants drum turning After securing motor drum wrap ping over itself Stan turns drum until motor stretched tightly peg dropped place lock drum Another photos gives close-up hemostat showing loose ends motor arranged secured Finally last photo series see actual tying operation So does work Stan described operation way Lay out piece rubber about t longer size loop need Mark exact length fine-line marker pen Slip 0 rings use clamp motor fixture making sure marks visible Apply small amount water-soluble lube over area marks Using non-nylon carpet thread make about three wraps around motor right mark tie two overhand knots right against wraps knot side should able see two wraps thread Remove motor clamp wash off lube thoroughly dry carefully Put drop Hot Stuff glass use bottles applicator tubing dipper apply tiny drop glue crotch loose ends motor steady also put tiny drop thread knot sure avoid getting glue motor anywhere active side tie Once t mastered method tying motors began breaking motors t used though always wind motors least 90% maximum turns wind-up Thirty-five cm models popular last several months model class limited 35cm wingspan has growing popularity wake recent discussions about revamping product review product review product review Smoke Generating Mufflers Super Smoke Pumper B&B Specialties 14234 Cleveland Road Granger IN 46530 Adding smoke Quarter Scale model guarantees spectators will able appreciate smoothness precision maneuvers deprive thrill B&B Specialties offers special Smoke Generating Mufflers fit Quadra Kawasaki Kioritz Roper Titan Evra Super Hustler engines mufflers tapped both sides allow flow smoke fluid introduced through two inlets instead muffler sells $2195 Super Smoke Pumpersetup consists pump control valve hoses fittings pump oper ates crankcase pressure requiring no extra batteries wiring Since setup doesnt pressurize smoke fluid tank theres no danger tank leaking over inside plane Super Smoke Pumper sells $1995 product review product review product review 162 Model Aviation PO Box 607 So Gallatin Road Madison_TN 37115 8685811 Sales ice Complete line ROYAL Electronics RIC Equipment WARRANTY repairs thing sell Call Ed Venus B rannan Repair Service HOBBY LOBBY EK LOGICTROL FUTABA HOBBY SHACK ROYAL ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX AMA Membership82 Ace RC Inc24 Aerolite Products150 Aeromarine Interprizes152 Aerotrend Products124 Air Design Airtronics Inside Front Cover 37 73 Americas Hobby Center Inc9 Andrews Aircraft Model Co119 Applied Design Corp151 BK Products159 Bantam Precision Products84 Richard G Barron157 Bavarian Precision Products Inc10 Behrens Plan Service149 Black Hawk Models157 Boynton & Associates154 Brownsell Flag & Decal163 Byron Originals25 76 California Model Imports10 Carolina-Taffinder128 Charlies R/C Goodies14 Circus Hobbies Inc136-141 George Clapp158 Columbia Model Crafts25 Consumers Hobby Corp126-1 27 Contempo Enterprises129 Coverite143 Cox Hobbies77 Jim Crockett Replicas124 DA Enterprises152 DGM Industries148 Davey Sy stems Corp134 Du-Bro Products Inc18 Dynathrust Props Inc163 E & R Hobbies132 Eastcraft Specialty Products161 Electronic Servicenter146 Addis Elmore162 Enya Model Products Co19 FAI Model Supply Inc132 146 FHS Supply Inc147 Flightline Shirts124 Flyline Models160 Fourmost Products156 Fox Manufacturing Co125 Full Command Systems147 Fults Tooling148 Futaba Corp America29 Futurfilte149 Gator R/C Products153 Gemini Models Inc153 Gibbs Hobby & Research160 Carl Goldberg Models Inc15 Gorham Model Products151 Great Lakes Model & Mold Co119 Great Planes Models Mfg Co2 Grish Brothers142 161 Hall Fame Giant Plane Flyln158 Hardware Systems134 Hayes Products47 DR Higgins Associates158 Hobby Barn 120-123 Hobby Capitol Distributors8 Hobby Hideaway161 Hobby Horn125 Hobby Lobby International4-7 Hobby Radio Shop162 Hobby Shack128 Homer Sales Inc28 Indian City RC Club134 Indy R/C Sales Inc130-131 J5 Enterprises156 K & B Manufacturing Co132 K & S Engineering74 Kraft R/C Electronics154 Kraft Systems51 Kress Technology132 Kustom Kraftsmanship128 LTA Systems162 Left Bank R/C Distributors150 Litco Systems11 Lone Star Models159 MACS Products132 Majestic Models124 Maxair Sports49 McDaniel R/C Service74 Jim Messers Quality Products128 Midwest Products Company128 Miniature Aircraft Supply133 Model Engineering Norwalk14 Model Merchant143 Model Rectifier Corp side Back Cover Modelmania153 Mutchiers144-145 Jerry Nelson & Co156 PARCS Club162 Pacific Sailpianes75 Peck-Polymers158 Pica Products153 Dave Platt Models Inc75 Plaza Hobbycraft148 Prop Shop24 RAC Products159 RF Enterprises129 RJL Industries156 RLF Products146 Repla-Tech International150 Roush Mfg Co157 Saf-Flite Models Sailplane Factory Satellite City Sheldons Hobby Shop Sig Manufacturing Co Bob Smith R/C Aircraft Sullivan Products rwings Tatone Products LR Taylor & Co Technopower II Inc. Top Flite Models r Hobbies Inc Twinn-K Inc US Quadra WE Technical Services Waterlines Williams Brothers Windsor Propeller Co World Engines - 150 147 24 13 - 148 135 84 - 28 - - 155 - 76 153 146 83 76 161 Back Cover CA Zaic Co119 Zenith Aviation Books2337 Nick Ziroli Models84 ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX FAI FID rules instituting special 50cm class explore possible rules configurations future Fl D models number people have suggested no need new class since 35cm class would accomplish same thing Whether valid point seeing 35cm models break 25 minutes blimp hangars Indoor Week 1982 week June 13-20 1982 will Indoor Week West Baden week begins abigClass AAAA-type Indoor meet jointly sponsored National Free Flight Society NFFS National Indoor Model Airplane Society NIMAS Illinois Model Aero Club IMAC Chicago Aeronuts contest will feature 14 model classes both formal AMA events nonAMA events such Bostonian two classes Indoor Speed Immediately after meet NIMAS VITNART meet will begin III World Peanut Gran Prix intertwined Gran Prix will run 24 hours continuously beginning 8 pm June 18 VIINART events will share flying space during June 19 Part fun festivities include three banquets contest cant get fill Indoor flying week youll never make details contact Bud Tenni PO Box 545 Richardson TX 75080 FF Old-Timers/Haught Continued page 69 something under 100 psi typically about 100 strokes pump Starting engine consists opening air valve sounds interesting ready challenge constructing own compressed air engine drop line Bert Pond 128 Warren Terrace Long Meadow MA 01106 Bert Dean Compressed-Air Engines has plans over 25 different engines well informa tive articles tank construction CA flying general Prices reasonable thought tinkering cutting filing soldering slows down Bert has limited quantity famous Hoosier Whirlwind threecylinder radials available complete tank ready hum Hoosier Whirlwind has engine beat since 1929 popular today SAM Champs compressed-air event promoted sponsored Tim Banaszak secretary-treasurer SAM engine paired up Hobart July 1982 163 writing advertisers meRtion read about Model Aviation SILK ~ OiScOuNtS ON $495/YD 50 YD ROLLS RedYellow Rool Blue Fine Qualily Model Building Any Lengtf Max 50 Yd SILK COVERS BEST LIGHT- STRONG- ECONOMICAL SHIPPING 0050 FOREIGN 150/ ORDER Id RES Add 4% BROWNSELL FLAG B DECAL CO 121 LAUREL ROAD NEW CITY NY 914-634-850010956
Edition: Model Aviation - 1982/07
Page Numbers: 68, 161, 162, 163
Free Flight INDOOR Bud Tenny PROP PITCH DESIGN Last time began design discussion prop pitch defined pitch blade element Pitch 6 x tangent blade angle x diameter prop blade element Lets examine different light begin assume examin ing blade element 5-in radius 10-in diameter addition must consider prop rpm model flight velocity fairly typical combina tion could 50 rpm 2 ft/sec velocity Working 50 rpm 24 in/scc velocity can construct triangle like shown Figure 1 base triangle represents distance traveled blade element second model movingor advancing forward 26 MODEL ADVANCE ANGLE H00 ANGLE OF ATTACK advance angle Indoor model can graphically determined flight speed prop rpm See text / / / / / / / / / / / 0/ NEW PITCH / Once advance angle known required prop pitch can calculated shown PITcH flito,ce Trvekd BIde EIenent/Seo 10 x 31616 x 5/6 24 other words second flying model advances 24 prop 50 rpm makes 5/6 revolution Since blade element 10 diameter element will move 10 x 31416 x5/6 rev 262 circular path model moves forward 24 construct scale triangle dimensions 262 units base 24 units side hypotenuse triangle forms angle equal Arc Tan 24/262 4260 Another way expressing say propeller has advance angle 4260 prop blade has 00 angle attack angle blade element 10 diameter would 4260 equal 288 pitch However usually expected prop blade will Continued page 161 68 Model Aviation Stan Chlltons rubber gluing apparatus motor stretched tightly between drum right surgical hemostats left Tenny photo Business end motor gluing apparatus Note arrangement motor ends clamp Tenny photo Once motor Ii stretched lightly lubricated will tied carpet thread used tie motor ends together See text details Tenny photo -~IASTEII AIRSCRIW PRESENTS BALSA STRIPPER 4 ER PRECISION STRIP WOOD ro S FROM BALSA SHEET ALSO FOR DRAFTING AND PHOTO MATS USES TYPE II BLADE SUPER TOOLGREAT PRICE WINDSOR PROPELLER CO 384 Tesconi Ct. Santa Rosa CA 95401 LEADER IN SMALL AIRFOIL TECHNOLOGY MiISIE1I iIIRSCREW IMPROVED THROUGH FOUR YEARS OF PRODUCTION THE G/F SERIES IS UNEQUALED FOR PERFORMANCE & DURABILITY AVAILABLE WORLDWIDE THROUGH 131 DISTRIBUTORS WINDSOR PROPELLER CO 384 Tesconi Ct suppose could happen MA editorial staff believed sort thing hasnt happened occasions particularly snotty remark aimed someone outside AMA management something really isnt appro priate subject column has deleted what see essentially what have written what see within quotation marks authored someone else has rewritten usually hope making bit clear better worse think ultimate nonsensicalness editorial we/our/us syndrome reached recent article author made reference fe Bob Meuser 4200 Gregory St Oakland CA 94619 FF Indoor/Tenny Continued oaae 68 operate about 70 angle attack illustrated Figure 2 work backwards through formula will find blade angle 4260 960 equal 369 pitch sum up model flies 24 per second have computed pitch 369 will give 50 rpm under conditions Thats too much trouble Well probably until need win World Championships However use 32-in pitch prop get model up its first flights can make flight tests measurements determine what next prop should final analysis model should trimmed minimum forward velocity allows reliable flight under given conditions air turbulent will necessary model fly faster order avoid stalling stumbling around loses flight time Similarly extragood conditions will allow safe slower flight As trim model slower flight rpm will also drop thus giving longer flight time since rubber unwinds slowly fast does modeivj7v Once have model trimmed just way want put enough turns model will climb about 10 ft above launch point level out help friend mark floor show opposite edges flight circle time long model takes make several circles flying level just after stops climbing Measure circle diameter marks floor compute circumference use time per lap compute average flight velocity use another stopwatch tomeasure rpm same time will able figure advance angle check prop perform ance Make careful flight performance records change different prop try again After making few systematic records will soon begin to~ zero what required improve models performance After well way winning contests Glue knot some time small number fliers have gluing Indoor motors together instead tying ends us have done years Im sure started using glue first place Pete Andrews made motors way 1972 Indoor World Champs Stan Chilton well known special fixtures motor gluing rig representative what does photos gives overview Stans HOBBYHI5EAWAYHO85yHIDEAWAYHOBByH15EWAYROEByRTflEAWAy FAMOUS BRITISH DIESELS AEROMODELLER PLANS CATALOG-DIESEL HANDBOOK $350 pp SPARES FOR M/E PAW D/C 2nd EDITION July 1982 161 Santa Rosa CA 95401 0- 0 0 On-Board Starting System Its No Longer Luxury Eastcrafts Lectra Starter Systems realistic practical important prevent injuries caused hand cranking engine Most systems available stock Also available marine applications Send $1 complete catalog EASTC RAFT Specialty Products PO Box 508-MA Irwin PA 15642 412 864-4959 HOBBY HIDEWAY1DELAVANIL 309 244-7389 61734 HCBBYHJDEAWMHOBBYHIDEAWAYHOBEVHT5EAWAYIIO55VHIDEW OR RC BUMP SIX PUFF LONG ciii ckhghfud liiia i cr itpvd N f /1I mnautiiriiirs u/Ireintiidoiis/iiii Li dali,, super/oh thazci lot firtoiirci ideal tcieSI iiideiiAiiieriiitA DOCUMENTED FROM CUSTOMERS UNSOLICITED LElTERS Electric powered / solid-state proportional contrOl / no servos / no mechanical switches linkages/reliable/ trouble-f ree Use standard 3 chan transmitter & receiver/ use single 48 volt battery / flies 1 hour 500 mah Three independently controlled reversible electric thrus ters give precise guidance airspeeds / smallest space Straight up/down climb/dive Standing pivot turns Reduced power/single engine maneuvers 0 4 mph forward/back KIT Prefabricated gas bag motors propellers Pre-cut balsa foam parts decals motor control printed cir cuit board components assembled Fly yourtrans rec 48v ba LTAB1K 5180 FACTORY BUILT Same Kit factory assembled Simply fill Heitium fly trans rec 48v ba LTA61KB 5235 FACTORY BUILT WiTh BUILT-IN RECEIVER customized trans specify make & frog LTA61KBR $335 White bag standard Satin silver bag available factory built units add $20 Custom screening available welding supply shops Order Prepaid pay shippingi COD DEALER INOUIRIES EVITED LTA SYSTEMS OSMOND LANE O UTAH 84604 PENNSYLVANIA AVENUE RADIO CONTROL SOCIETY % %ah YEa%tn% 15th Annual Giant & Sport Scale Competition! Registration 830-1130 am Flying starts 830 am Sunday July 18 1982 Floyd Bennett Field Brooklyn NY Largest Controlled Model Air Park New York State SPORT SCALE GIANT SCALE Separate Judging Giant Scale y Fee $23 First Event $15 Second Entry $3 goes US Scale Masters Fund Contest Director Jerry Behrens 31-27 Healy Ave Far Rockaway NY 11691 212-337-6987 motor gluing apparatus showing motor ready made up left can see surgical hemostat holding two ends motor motor stretched around drum right drum used winch motor being wrapped holds itself drum top drum visible top peg drops hole fixtures base preventing * ** *WANDITTM p. PLr *Oealers Invited * * oliC year warrafltfhin * *CORD * * WetorOry * Stick Abrasives * A Keen Machine giees exceptional nding control excellent finish asic mcI 1 flat Wand 1 *of S grits *10895Builder Special mcI 2 flat 1 half *round vjand 5 6 grits *1295Deluse includes 3 flat 2 half *rsund wands buff wands *10 6 grits * *Additional Wands Abrasives avarlable *See local hubby shop * ADDIS ELMORE Eve No 214 280 5705 *PO Box 266 uite tenas 75149 * US SCALE MASTERS REGIONAL QUALIFYING COMPETITION DS TO 5th PLACE Both Catagorias FREE REFRESHMENTS Contestants drum turning After securing motor drum wrap ping over itself Stan turns drum until motor stretched tightly peg dropped place lock drum Another photos gives close-up hemostat showing loose ends motor arranged secured Finally last photo series see actual tying operation So does work Stan described operation way Lay out piece rubber about t longer size loop need Mark exact length fine-line marker pen Slip 0 rings use clamp motor fixture making sure marks visible Apply small amount water-soluble lube over area marks Using non-nylon carpet thread make about three wraps around motor right mark tie two overhand knots right against wraps knot side should able see two wraps thread Remove motor clamp wash off lube thoroughly dry carefully Put drop Hot Stuff glass use bottles applicator tubing dipper apply tiny drop glue crotch loose ends motor steady also put tiny drop thread knot sure avoid getting glue motor anywhere active side tie Once t mastered method tying motors began breaking motors t used though always wind motors least 90% maximum turns wind-up Thirty-five cm models popular last several months model class limited 35cm wingspan has growing popularity wake recent discussions about revamping product review product review product review Smoke Generating Mufflers Super Smoke Pumper B&B Specialties 14234 Cleveland Road Granger IN 46530 Adding smoke Quarter Scale model guarantees spectators will able appreciate smoothness precision maneuvers deprive thrill B&B Specialties offers special Smoke Generating Mufflers fit Quadra Kawasaki Kioritz Roper Titan Evra Super Hustler engines mufflers tapped both sides allow flow smoke fluid introduced through two inlets instead muffler sells $2195 Super Smoke Pumpersetup consists pump control valve hoses fittings pump oper ates crankcase pressure requiring no extra batteries wiring Since setup doesnt pressurize smoke fluid tank theres no danger tank leaking over inside plane Super Smoke Pumper sells $1995 product review product review product review 162 Model Aviation PO Box 607 So Gallatin Road Madison_TN 37115 8685811 Sales ice Complete line ROYAL Electronics RIC Equipment WARRANTY repairs thing sell Call Ed Venus B rannan Repair Service HOBBY LOBBY EK LOGICTROL FUTABA HOBBY SHACK ROYAL ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX AMA Membership82 Ace RC Inc24 Aerolite Products150 Aeromarine Interprizes152 Aerotrend Products124 Air Design Airtronics Inside Front Cover 37 73 Americas Hobby Center Inc9 Andrews Aircraft Model Co119 Applied Design Corp151 BK Products159 Bantam Precision Products84 Richard G Barron157 Bavarian Precision Products Inc10 Behrens Plan Service149 Black Hawk Models157 Boynton & Associates154 Brownsell Flag & Decal163 Byron Originals25 76 California Model Imports10 Carolina-Taffinder128 Charlies R/C Goodies14 Circus Hobbies Inc136-141 George Clapp158 Columbia Model Crafts25 Consumers Hobby Corp126-1 27 Contempo Enterprises129 Coverite143 Cox Hobbies77 Jim Crockett Replicas124 DA Enterprises152 DGM Industries148 Davey Sy stems Corp134 Du-Bro Products Inc18 Dynathrust Props Inc163 E & R Hobbies132 Eastcraft Specialty Products161 Electronic Servicenter146 Addis Elmore162 Enya Model Products Co19 FAI Model Supply Inc132 146 FHS Supply Inc147 Flightline Shirts124 Flyline Models160 Fourmost Products156 Fox Manufacturing Co125 Full Command Systems147 Fults Tooling148 Futaba Corp America29 Futurfilte149 Gator R/C Products153 Gemini Models Inc153 Gibbs Hobby & Research160 Carl Goldberg Models Inc15 Gorham Model Products151 Great Lakes Model & Mold Co119 Great Planes Models Mfg Co2 Grish Brothers142 161 Hall Fame Giant Plane Flyln158 Hardware Systems134 Hayes Products47 DR Higgins Associates158 Hobby Barn 120-123 Hobby Capitol Distributors8 Hobby Hideaway161 Hobby Horn125 Hobby Lobby International4-7 Hobby Radio Shop162 Hobby Shack128 Homer Sales Inc28 Indian City RC Club134 Indy R/C Sales Inc130-131 J5 Enterprises156 K & B Manufacturing Co132 K & S Engineering74 Kraft R/C Electronics154 Kraft Systems51 Kress Technology132 Kustom Kraftsmanship128 LTA Systems162 Left Bank R/C Distributors150 Litco Systems11 Lone Star Models159 MACS Products132 Majestic Models124 Maxair Sports49 McDaniel R/C Service74 Jim Messers Quality Products128 Midwest Products Company128 Miniature Aircraft Supply133 Model Engineering Norwalk14 Model Merchant143 Model Rectifier Corp side Back Cover Modelmania153 Mutchiers144-145 Jerry Nelson & Co156 PARCS Club162 Pacific Sailpianes75 Peck-Polymers158 Pica Products153 Dave Platt Models Inc75 Plaza Hobbycraft148 Prop Shop24 RAC Products159 RF Enterprises129 RJL Industries156 RLF Products146 Repla-Tech International150 Roush Mfg Co157 Saf-Flite Models Sailplane Factory Satellite City Sheldons Hobby Shop Sig Manufacturing Co Bob Smith R/C Aircraft Sullivan Products rwings Tatone Products LR Taylor & Co Technopower II Inc. Top Flite Models r Hobbies Inc Twinn-K Inc US Quadra WE Technical Services Waterlines Williams Brothers Windsor Propeller Co World Engines - 150 147 24 13 - 148 135 84 - 28 - - 155 - 76 153 146 83 76 161 Back Cover CA Zaic Co119 Zenith Aviation Books2337 Nick Ziroli Models84 ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX FAI FID rules instituting special 50cm class explore possible rules configurations future Fl D models number people have suggested no need new class since 35cm class would accomplish same thing Whether valid point seeing 35cm models break 25 minutes blimp hangars Indoor Week 1982 week June 13-20 1982 will Indoor Week West Baden week begins abigClass AAAA-type Indoor meet jointly sponsored National Free Flight Society NFFS National Indoor Model Airplane Society NIMAS Illinois Model Aero Club IMAC Chicago Aeronuts contest will feature 14 model classes both formal AMA events nonAMA events such Bostonian two classes Indoor Speed Immediately after meet NIMAS VITNART meet will begin III World Peanut Gran Prix intertwined Gran Prix will run 24 hours continuously beginning 8 pm June 18 VIINART events will share flying space during June 19 Part fun festivities include three banquets contest cant get fill Indoor flying week youll never make details contact Bud Tenni PO Box 545 Richardson TX 75080 FF Old-Timers/Haught Continued page 69 something under 100 psi typically about 100 strokes pump Starting engine consists opening air valve sounds interesting ready challenge constructing own compressed air engine drop line Bert Pond 128 Warren Terrace Long Meadow MA 01106 Bert Dean Compressed-Air Engines has plans over 25 different engines well informa tive articles tank construction CA flying general Prices reasonable thought tinkering cutting filing soldering slows down Bert has limited quantity famous Hoosier Whirlwind threecylinder radials available complete tank ready hum Hoosier Whirlwind has engine beat since 1929 popular today SAM Champs compressed-air event promoted sponsored Tim Banaszak secretary-treasurer SAM engine paired up Hobart July 1982 163 writing advertisers meRtion read about Model Aviation SILK ~ OiScOuNtS ON $495/YD 50 YD ROLLS RedYellow Rool Blue Fine Qualily Model Building Any Lengtf Max 50 Yd SILK COVERS BEST LIGHT- STRONG- ECONOMICAL SHIPPING 0050 FOREIGN 150/ ORDER Id RES Add 4% BROWNSELL FLAG B DECAL CO 121 LAUREL ROAD NEW CITY NY 914-634-850010956
Edition: Model Aviation - 1982/07
Page Numbers: 68, 161, 162, 163
Free Flight INDOOR Bud Tenny PROP PITCH DESIGN Last time began design discussion prop pitch defined pitch blade element Pitch 6 x tangent blade angle x diameter prop blade element Lets examine different light begin assume examin ing blade element 5-in radius 10-in diameter addition must consider prop rpm model flight velocity fairly typical combina tion could 50 rpm 2 ft/sec velocity Working 50 rpm 24 in/scc velocity can construct triangle like shown Figure 1 base triangle represents distance traveled blade element second model movingor advancing forward 26 MODEL ADVANCE ANGLE H00 ANGLE OF ATTACK advance angle Indoor model can graphically determined flight speed prop rpm See text / / / / / / / / / / / 0/ NEW PITCH / Once advance angle known required prop pitch can calculated shown PITcH flito,ce Trvekd BIde EIenent/Seo 10 x 31616 x 5/6 24 other words second flying model advances 24 prop 50 rpm makes 5/6 revolution Since blade element 10 diameter element will move 10 x 31416 x5/6 rev 262 circular path model moves forward 24 construct scale triangle dimensions 262 units base 24 units side hypotenuse triangle forms angle equal Arc Tan 24/262 4260 Another way expressing say propeller has advance angle 4260 prop blade has 00 angle attack angle blade element 10 diameter would 4260 equal 288 pitch However usually expected prop blade will Continued page 161 68 Model Aviation Stan Chlltons rubber gluing apparatus motor stretched tightly between drum right surgical hemostats left Tenny photo Business end motor gluing apparatus Note arrangement motor ends clamp Tenny photo Once motor Ii stretched lightly lubricated will tied carpet thread used tie motor ends together See text details Tenny photo -~IASTEII AIRSCRIW PRESENTS BALSA STRIPPER 4 ER PRECISION STRIP WOOD ro S FROM BALSA SHEET ALSO FOR DRAFTING AND PHOTO MATS USES TYPE II BLADE SUPER TOOLGREAT PRICE WINDSOR PROPELLER CO 384 Tesconi Ct. Santa Rosa CA 95401 LEADER IN SMALL AIRFOIL TECHNOLOGY MiISIE1I iIIRSCREW IMPROVED THROUGH FOUR YEARS OF PRODUCTION THE G/F SERIES IS UNEQUALED FOR PERFORMANCE & DURABILITY AVAILABLE WORLDWIDE THROUGH 131 DISTRIBUTORS WINDSOR PROPELLER CO 384 Tesconi Ct suppose could happen MA editorial staff believed sort thing hasnt happened occasions particularly snotty remark aimed someone outside AMA management something really isnt appro priate subject column has deleted what see essentially what have written what see within quotation marks authored someone else has rewritten usually hope making bit clear better worse think ultimate nonsensicalness editorial we/our/us syndrome reached recent article author made reference fe Bob Meuser 4200 Gregory St Oakland CA 94619 FF Indoor/Tenny Continued oaae 68 operate about 70 angle attack illustrated Figure 2 work backwards through formula will find blade angle 4260 960 equal 369 pitch sum up model flies 24 per second have computed pitch 369 will give 50 rpm under conditions Thats too much trouble Well probably until need win World Championships However use 32-in pitch prop get model up its first flights can make flight tests measurements determine what next prop should final analysis model should trimmed minimum forward velocity allows reliable flight under given conditions air turbulent will necessary model fly faster order avoid stalling stumbling around loses flight time Similarly extragood conditions will allow safe slower flight As trim model slower flight rpm will also drop thus giving longer flight time since rubber unwinds slowly fast does modeivj7v Once have model trimmed just way want put enough turns model will climb about 10 ft above launch point level out help friend mark floor show opposite edges flight circle time long model takes make several circles flying level just after stops climbing Measure circle diameter marks floor compute circumference use time per lap compute average flight velocity use another stopwatch tomeasure rpm same time will able figure advance angle check prop perform ance Make careful flight performance records change different prop try again After making few systematic records will soon begin to~ zero what required improve models performance After well way winning contests Glue knot some time small number fliers have gluing Indoor motors together instead tying ends us have done years Im sure started using glue first place Pete Andrews made motors way 1972 Indoor World Champs Stan Chilton well known special fixtures motor gluing rig representative what does photos gives overview Stans HOBBYHI5EAWAYHO85yHIDEAWAYHOBByH15EWAYROEByRTflEAWAy FAMOUS BRITISH DIESELS AEROMODELLER PLANS CATALOG-DIESEL HANDBOOK $350 pp SPARES FOR M/E PAW D/C 2nd EDITION July 1982 161 Santa Rosa CA 95401 0- 0 0 On-Board Starting System Its No Longer Luxury Eastcrafts Lectra Starter Systems realistic practical important prevent injuries caused hand cranking engine Most systems available stock Also available marine applications Send $1 complete catalog EASTC RAFT Specialty Products PO Box 508-MA Irwin PA 15642 412 864-4959 HOBBY HIDEWAY1DELAVANIL 309 244-7389 61734 HCBBYHJDEAWMHOBBYHIDEAWAYHOBEVHT5EAWAYIIO55VHIDEW OR RC BUMP SIX PUFF LONG ciii ckhghfud liiia i cr itpvd N f /1I mnautiiriiirs u/Ireintiidoiis/iiii Li dali,, super/oh thazci lot firtoiirci ideal tcieSI iiideiiAiiieriiitA DOCUMENTED FROM CUSTOMERS UNSOLICITED LElTERS Electric powered / solid-state proportional contrOl / no servos / no mechanical switches linkages/reliable/ trouble-f ree Use standard 3 chan transmitter & receiver/ use single 48 volt battery / flies 1 hour 500 mah Three independently controlled reversible electric thrus ters give precise guidance airspeeds / smallest space Straight up/down climb/dive Standing pivot turns Reduced power/single engine maneuvers 0 4 mph forward/back KIT Prefabricated gas bag motors propellers Pre-cut balsa foam parts decals motor control printed cir cuit board components assembled Fly yourtrans rec 48v ba LTAB1K 5180 FACTORY BUILT Same Kit factory assembled Simply fill Heitium fly trans rec 48v ba LTA61KB 5235 FACTORY BUILT WiTh BUILT-IN RECEIVER customized trans specify make & frog LTA61KBR $335 White bag standard Satin silver bag available factory built units add $20 Custom screening available welding supply shops Order Prepaid pay shippingi COD DEALER INOUIRIES EVITED LTA SYSTEMS OSMOND LANE O UTAH 84604 PENNSYLVANIA AVENUE RADIO CONTROL SOCIETY % %ah YEa%tn% 15th Annual Giant & Sport Scale Competition! Registration 830-1130 am Flying starts 830 am Sunday July 18 1982 Floyd Bennett Field Brooklyn NY Largest Controlled Model Air Park New York State SPORT SCALE GIANT SCALE Separate Judging Giant Scale y Fee $23 First Event $15 Second Entry $3 goes US Scale Masters Fund Contest Director Jerry Behrens 31-27 Healy Ave Far Rockaway NY 11691 212-337-6987 motor gluing apparatus showing motor ready made up left can see surgical hemostat holding two ends motor motor stretched around drum right drum used winch motor being wrapped holds itself drum top drum visible top peg drops hole fixtures base preventing * ** *WANDITTM p. PLr *Oealers Invited * * oliC year warrafltfhin * *CORD * * WetorOry * Stick Abrasives * A Keen Machine giees exceptional nding control excellent finish asic mcI 1 flat Wand 1 *of S grits *10895Builder Special mcI 2 flat 1 half *round vjand 5 6 grits *1295Deluse includes 3 flat 2 half *rsund wands buff wands *10 6 grits * *Additional Wands Abrasives avarlable *See local hubby shop * ADDIS ELMORE Eve No 214 280 5705 *PO Box 266 uite tenas 75149 * US SCALE MASTERS REGIONAL QUALIFYING COMPETITION DS TO 5th PLACE Both Catagorias FREE REFRESHMENTS Contestants drum turning After securing motor drum wrap ping over itself Stan turns drum until motor stretched tightly peg dropped place lock drum Another photos gives close-up hemostat showing loose ends motor arranged secured Finally last photo series see actual tying operation So does work Stan described operation way Lay out piece rubber about t longer size loop need Mark exact length fine-line marker pen Slip 0 rings use clamp motor fixture making sure marks visible Apply small amount water-soluble lube over area marks Using non-nylon carpet thread make about three wraps around motor right mark tie two overhand knots right against wraps knot side should able see two wraps thread Remove motor clamp wash off lube thoroughly dry carefully Put drop Hot Stuff glass use bottles applicator tubing dipper apply tiny drop glue crotch loose ends motor steady also put tiny drop thread knot sure avoid getting glue motor anywhere active side tie Once t mastered method tying motors began breaking motors t used though always wind motors least 90% maximum turns wind-up Thirty-five cm models popular last several months model class limited 35cm wingspan has growing popularity wake recent discussions about revamping product review product review product review Smoke Generating Mufflers Super Smoke Pumper B&B Specialties 14234 Cleveland Road Granger IN 46530 Adding smoke Quarter Scale model guarantees spectators will able appreciate smoothness precision maneuvers deprive thrill B&B Specialties offers special Smoke Generating Mufflers fit Quadra Kawasaki Kioritz Roper Titan Evra Super Hustler engines mufflers tapped both sides allow flow smoke fluid introduced through two inlets instead muffler sells $2195 Super Smoke Pumpersetup consists pump control valve hoses fittings pump oper ates crankcase pressure requiring no extra batteries wiring Since setup doesnt pressurize smoke fluid tank theres no danger tank leaking over inside plane Super Smoke Pumper sells $1995 product review product review product review 162 Model Aviation PO Box 607 So Gallatin Road Madison_TN 37115 8685811 Sales ice Complete line ROYAL Electronics RIC Equipment WARRANTY repairs thing sell Call Ed Venus B rannan Repair Service HOBBY LOBBY EK LOGICTROL FUTABA HOBBY SHACK ROYAL ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX AMA Membership82 Ace RC Inc24 Aerolite Products150 Aeromarine Interprizes152 Aerotrend Products124 Air Design Airtronics Inside Front Cover 37 73 Americas Hobby Center Inc9 Andrews Aircraft Model Co119 Applied Design Corp151 BK Products159 Bantam Precision Products84 Richard G Barron157 Bavarian Precision Products Inc10 Behrens Plan Service149 Black Hawk Models157 Boynton & Associates154 Brownsell Flag & Decal163 Byron Originals25 76 California Model Imports10 Carolina-Taffinder128 Charlies R/C Goodies14 Circus Hobbies Inc136-141 George Clapp158 Columbia Model Crafts25 Consumers Hobby Corp126-1 27 Contempo Enterprises129 Coverite143 Cox Hobbies77 Jim Crockett Replicas124 DA Enterprises152 DGM Industries148 Davey Sy stems Corp134 Du-Bro Products Inc18 Dynathrust Props Inc163 E & R Hobbies132 Eastcraft Specialty Products161 Electronic Servicenter146 Addis Elmore162 Enya Model Products Co19 FAI Model Supply Inc132 146 FHS Supply Inc147 Flightline Shirts124 Flyline Models160 Fourmost Products156 Fox Manufacturing Co125 Full Command Systems147 Fults Tooling148 Futaba Corp America29 Futurfilte149 Gator R/C Products153 Gemini Models Inc153 Gibbs Hobby & Research160 Carl Goldberg Models Inc15 Gorham Model Products151 Great Lakes Model & Mold Co119 Great Planes Models Mfg Co2 Grish Brothers142 161 Hall Fame Giant Plane Flyln158 Hardware Systems134 Hayes Products47 DR Higgins Associates158 Hobby Barn 120-123 Hobby Capitol Distributors8 Hobby Hideaway161 Hobby Horn125 Hobby Lobby International4-7 Hobby Radio Shop162 Hobby Shack128 Homer Sales Inc28 Indian City RC Club134 Indy R/C Sales Inc130-131 J5 Enterprises156 K & B Manufacturing Co132 K & S Engineering74 Kraft R/C Electronics154 Kraft Systems51 Kress Technology132 Kustom Kraftsmanship128 LTA Systems162 Left Bank R/C Distributors150 Litco Systems11 Lone Star Models159 MACS Products132 Majestic Models124 Maxair Sports49 McDaniel R/C Service74 Jim Messers Quality Products128 Midwest Products Company128 Miniature Aircraft Supply133 Model Engineering Norwalk14 Model Merchant143 Model Rectifier Corp side Back Cover Modelmania153 Mutchiers144-145 Jerry Nelson & Co156 PARCS Club162 Pacific Sailpianes75 Peck-Polymers158 Pica Products153 Dave Platt Models Inc75 Plaza Hobbycraft148 Prop Shop24 RAC Products159 RF Enterprises129 RJL Industries156 RLF Products146 Repla-Tech International150 Roush Mfg Co157 Saf-Flite Models Sailplane Factory Satellite City Sheldons Hobby Shop Sig Manufacturing Co Bob Smith R/C Aircraft Sullivan Products rwings Tatone Products LR Taylor & Co Technopower II Inc. Top Flite Models r Hobbies Inc Twinn-K Inc US Quadra WE Technical Services Waterlines Williams Brothers Windsor Propeller Co World Engines - 150 147 24 13 - 148 135 84 - 28 - - 155 - 76 153 146 83 76 161 Back Cover CA Zaic Co119 Zenith Aviation Books2337 Nick Ziroli Models84 ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX FAI FID rules instituting special 50cm class explore possible rules configurations future Fl D models number people have suggested no need new class since 35cm class would accomplish same thing Whether valid point seeing 35cm models break 25 minutes blimp hangars Indoor Week 1982 week June 13-20 1982 will Indoor Week West Baden week begins abigClass AAAA-type Indoor meet jointly sponsored National Free Flight Society NFFS National Indoor Model Airplane Society NIMAS Illinois Model Aero Club IMAC Chicago Aeronuts contest will feature 14 model classes both formal AMA events nonAMA events such Bostonian two classes Indoor Speed Immediately after meet NIMAS VITNART meet will begin III World Peanut Gran Prix intertwined Gran Prix will run 24 hours continuously beginning 8 pm June 18 VIINART events will share flying space during June 19 Part fun festivities include three banquets contest cant get fill Indoor flying week youll never make details contact Bud Tenni PO Box 545 Richardson TX 75080 FF Old-Timers/Haught Continued page 69 something under 100 psi typically about 100 strokes pump Starting engine consists opening air valve sounds interesting ready challenge constructing own compressed air engine drop line Bert Pond 128 Warren Terrace Long Meadow MA 01106 Bert Dean Compressed-Air Engines has plans over 25 different engines well informa tive articles tank construction CA flying general Prices reasonable thought tinkering cutting filing soldering slows down Bert has limited quantity famous Hoosier Whirlwind threecylinder radials available complete tank ready hum Hoosier Whirlwind has engine beat since 1929 popular today SAM Champs compressed-air event promoted sponsored Tim Banaszak secretary-treasurer SAM engine paired up Hobart July 1982 163 writing advertisers meRtion read about Model Aviation SILK ~ OiScOuNtS ON $495/YD 50 YD ROLLS RedYellow Rool Blue Fine Qualily Model Building Any Lengtf Max 50 Yd SILK COVERS BEST LIGHT- STRONG- ECONOMICAL SHIPPING 0050 FOREIGN 150/ ORDER Id RES Add 4% BROWNSELL FLAG B DECAL CO 121 LAUREL ROAD NEW CITY NY 914-634-850010956
Edition: Model Aviation - 1982/07
Page Numbers: 68, 161, 162, 163
Free Flight INDOOR Bud Tenny PROP PITCH DESIGN Last time began design discussion prop pitch defined pitch blade element Pitch 6 x tangent blade angle x diameter prop blade element Lets examine different light begin assume examin ing blade element 5-in radius 10-in diameter addition must consider prop rpm model flight velocity fairly typical combina tion could 50 rpm 2 ft/sec velocity Working 50 rpm 24 in/scc velocity can construct triangle like shown Figure 1 base triangle represents distance traveled blade element second model movingor advancing forward 26 MODEL ADVANCE ANGLE H00 ANGLE OF ATTACK advance angle Indoor model can graphically determined flight speed prop rpm See text / / / / / / / / / / / 0/ NEW PITCH / Once advance angle known required prop pitch can calculated shown PITcH flito,ce Trvekd BIde EIenent/Seo 10 x 31616 x 5/6 24 other words second flying model advances 24 prop 50 rpm makes 5/6 revolution Since blade element 10 diameter element will move 10 x 31416 x5/6 rev 262 circular path model moves forward 24 construct scale triangle dimensions 262 units base 24 units side hypotenuse triangle forms angle equal Arc Tan 24/262 4260 Another way expressing say propeller has advance angle 4260 prop blade has 00 angle attack angle blade element 10 diameter would 4260 equal 288 pitch However usually expected prop blade will Continued page 161 68 Model Aviation Stan Chlltons rubber gluing apparatus motor stretched tightly between drum right surgical hemostats left Tenny photo Business end motor gluing apparatus Note arrangement motor ends clamp Tenny photo Once motor Ii stretched lightly lubricated will tied carpet thread used tie motor ends together See text details Tenny photo -~IASTEII AIRSCRIW PRESENTS BALSA STRIPPER 4 ER PRECISION STRIP WOOD ro S FROM BALSA SHEET ALSO FOR DRAFTING AND PHOTO MATS USES TYPE II BLADE SUPER TOOLGREAT PRICE WINDSOR PROPELLER CO 384 Tesconi Ct. Santa Rosa CA 95401 LEADER IN SMALL AIRFOIL TECHNOLOGY MiISIE1I iIIRSCREW IMPROVED THROUGH FOUR YEARS OF PRODUCTION THE G/F SERIES IS UNEQUALED FOR PERFORMANCE & DURABILITY AVAILABLE WORLDWIDE THROUGH 131 DISTRIBUTORS WINDSOR PROPELLER CO 384 Tesconi Ct suppose could happen MA editorial staff believed sort thing hasnt happened occasions particularly snotty remark aimed someone outside AMA management something really isnt appro priate subject column has deleted what see essentially what have written what see within quotation marks authored someone else has rewritten usually hope making bit clear better worse think ultimate nonsensicalness editorial we/our/us syndrome reached recent article author made reference fe Bob Meuser 4200 Gregory St Oakland CA 94619 FF Indoor/Tenny Continued oaae 68 operate about 70 angle attack illustrated Figure 2 work backwards through formula will find blade angle 4260 960 equal 369 pitch sum up model flies 24 per second have computed pitch 369 will give 50 rpm under conditions Thats too much trouble Well probably until need win World Championships However use 32-in pitch prop get model up its first flights can make flight tests measurements determine what next prop should final analysis model should trimmed minimum forward velocity allows reliable flight under given conditions air turbulent will necessary model fly faster order avoid stalling stumbling around loses flight time Similarly extragood conditions will allow safe slower flight As trim model slower flight rpm will also drop thus giving longer flight time since rubber unwinds slowly fast does modeivj7v Once have model trimmed just way want put enough turns model will climb about 10 ft above launch point level out help friend mark floor show opposite edges flight circle time long model takes make several circles flying level just after stops climbing Measure circle diameter marks floor compute circumference use time per lap compute average flight velocity use another stopwatch tomeasure rpm same time will able figure advance angle check prop perform ance Make careful flight performance records change different prop try again After making few systematic records will soon begin to~ zero what required improve models performance After well way winning contests Glue knot some time small number fliers have gluing Indoor motors together instead tying ends us have done years Im sure started using glue first place Pete Andrews made motors way 1972 Indoor World Champs Stan Chilton well known special fixtures motor gluing rig representative what does photos gives overview Stans HOBBYHI5EAWAYHO85yHIDEAWAYHOBByH15EWAYROEByRTflEAWAy FAMOUS BRITISH DIESELS AEROMODELLER PLANS CATALOG-DIESEL HANDBOOK $350 pp SPARES FOR M/E PAW D/C 2nd EDITION July 1982 161 Santa Rosa CA 95401 0- 0 0 On-Board Starting System Its No Longer Luxury Eastcrafts Lectra Starter Systems realistic practical important prevent injuries caused hand cranking engine Most systems available stock Also available marine applications Send $1 complete catalog EASTC RAFT Specialty Products PO Box 508-MA Irwin PA 15642 412 864-4959 HOBBY HIDEWAY1DELAVANIL 309 244-7389 61734 HCBBYHJDEAWMHOBBYHIDEAWAYHOBEVHT5EAWAYIIO55VHIDEW OR RC BUMP SIX PUFF LONG ciii ckhghfud liiia i cr itpvd N f /1I mnautiiriiirs u/Ireintiidoiis/iiii Li dali,, super/oh thazci lot firtoiirci ideal tcieSI iiideiiAiiieriiitA DOCUMENTED FROM CUSTOMERS UNSOLICITED LElTERS Electric powered / solid-state proportional contrOl / no servos / no mechanical switches linkages/reliable/ trouble-f ree Use standard 3 chan transmitter & receiver/ use single 48 volt battery / flies 1 hour 500 mah Three independently controlled reversible electric thrus ters give precise guidance airspeeds / smallest space Straight up/down climb/dive Standing pivot turns Reduced power/single engine maneuvers 0 4 mph forward/back KIT Prefabricated gas bag motors propellers Pre-cut balsa foam parts decals motor control printed cir cuit board components assembled Fly yourtrans rec 48v ba LTAB1K 5180 FACTORY BUILT Same Kit factory assembled Simply fill Heitium fly trans rec 48v ba LTA61KB 5235 FACTORY BUILT WiTh BUILT-IN RECEIVER customized trans specify make & frog LTA61KBR $335 White bag standard Satin silver bag available factory built units add $20 Custom screening available welding supply shops Order Prepaid pay shippingi COD DEALER INOUIRIES EVITED LTA SYSTEMS OSMOND LANE O UTAH 84604 PENNSYLVANIA AVENUE RADIO CONTROL SOCIETY % %ah YEa%tn% 15th Annual Giant & Sport Scale Competition! Registration 830-1130 am Flying starts 830 am Sunday July 18 1982 Floyd Bennett Field Brooklyn NY Largest Controlled Model Air Park New York State SPORT SCALE GIANT SCALE Separate Judging Giant Scale y Fee $23 First Event $15 Second Entry $3 goes US Scale Masters Fund Contest Director Jerry Behrens 31-27 Healy Ave Far Rockaway NY 11691 212-337-6987 motor gluing apparatus showing motor ready made up left can see surgical hemostat holding two ends motor motor stretched around drum right drum used winch motor being wrapped holds itself drum top drum visible top peg drops hole fixtures base preventing * ** *WANDITTM p. PLr *Oealers Invited * * oliC year warrafltfhin * *CORD * * WetorOry * Stick Abrasives * A Keen Machine giees exceptional nding control excellent finish asic mcI 1 flat Wand 1 *of S grits *10895Builder Special mcI 2 flat 1 half *round vjand 5 6 grits *1295Deluse includes 3 flat 2 half *rsund wands buff wands *10 6 grits * *Additional Wands Abrasives avarlable *See local hubby shop * ADDIS ELMORE Eve No 214 280 5705 *PO Box 266 uite tenas 75149 * US SCALE MASTERS REGIONAL QUALIFYING COMPETITION DS TO 5th PLACE Both Catagorias FREE REFRESHMENTS Contestants drum turning After securing motor drum wrap ping over itself Stan turns drum until motor stretched tightly peg dropped place lock drum Another photos gives close-up hemostat showing loose ends motor arranged secured Finally last photo series see actual tying operation So does work Stan described operation way Lay out piece rubber about t longer size loop need Mark exact length fine-line marker pen Slip 0 rings use clamp motor fixture making sure marks visible Apply small amount water-soluble lube over area marks Using non-nylon carpet thread make about three wraps around motor right mark tie two overhand knots right against wraps knot side should able see two wraps thread Remove motor clamp wash off lube thoroughly dry carefully Put drop Hot Stuff glass use bottles applicator tubing dipper apply tiny drop glue crotch loose ends motor steady also put tiny drop thread knot sure avoid getting glue motor anywhere active side tie Once t mastered method tying motors began breaking motors t used though always wind motors least 90% maximum turns wind-up Thirty-five cm models popular last several months model class limited 35cm wingspan has growing popularity wake recent discussions about revamping product review product review product review Smoke Generating Mufflers Super Smoke Pumper B&B Specialties 14234 Cleveland Road Granger IN 46530 Adding smoke Quarter Scale model guarantees spectators will able appreciate smoothness precision maneuvers deprive thrill B&B Specialties offers special Smoke Generating Mufflers fit Quadra Kawasaki Kioritz Roper Titan Evra Super Hustler engines mufflers tapped both sides allow flow smoke fluid introduced through two inlets instead muffler sells $2195 Super Smoke Pumpersetup consists pump control valve hoses fittings pump oper ates crankcase pressure requiring no extra batteries wiring Since setup doesnt pressurize smoke fluid tank theres no danger tank leaking over inside plane Super Smoke Pumper sells $1995 product review product review product review 162 Model Aviation PO Box 607 So Gallatin Road Madison_TN 37115 8685811 Sales ice Complete line ROYAL Electronics RIC Equipment WARRANTY repairs thing sell Call Ed Venus B rannan Repair Service HOBBY LOBBY EK LOGICTROL FUTABA HOBBY SHACK ROYAL ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX AMA Membership82 Ace RC Inc24 Aerolite Products150 Aeromarine Interprizes152 Aerotrend Products124 Air Design Airtronics Inside Front Cover 37 73 Americas Hobby Center Inc9 Andrews Aircraft Model Co119 Applied Design Corp151 BK Products159 Bantam Precision Products84 Richard G Barron157 Bavarian Precision Products Inc10 Behrens Plan Service149 Black Hawk Models157 Boynton & Associates154 Brownsell Flag & Decal163 Byron Originals25 76 California Model Imports10 Carolina-Taffinder128 Charlies R/C Goodies14 Circus Hobbies Inc136-141 George Clapp158 Columbia Model Crafts25 Consumers Hobby Corp126-1 27 Contempo Enterprises129 Coverite143 Cox Hobbies77 Jim Crockett Replicas124 DA Enterprises152 DGM Industries148 Davey Sy stems Corp134 Du-Bro Products Inc18 Dynathrust Props Inc163 E & R Hobbies132 Eastcraft Specialty Products161 Electronic Servicenter146 Addis Elmore162 Enya Model Products Co19 FAI Model Supply Inc132 146 FHS Supply Inc147 Flightline Shirts124 Flyline Models160 Fourmost Products156 Fox Manufacturing Co125 Full Command Systems147 Fults Tooling148 Futaba Corp America29 Futurfilte149 Gator R/C Products153 Gemini Models Inc153 Gibbs Hobby & Research160 Carl Goldberg Models Inc15 Gorham Model Products151 Great Lakes Model & Mold Co119 Great Planes Models Mfg Co2 Grish Brothers142 161 Hall Fame Giant Plane Flyln158 Hardware Systems134 Hayes Products47 DR Higgins Associates158 Hobby Barn 120-123 Hobby Capitol Distributors8 Hobby Hideaway161 Hobby Horn125 Hobby Lobby International4-7 Hobby Radio Shop162 Hobby Shack128 Homer Sales Inc28 Indian City RC Club134 Indy R/C Sales Inc130-131 J5 Enterprises156 K & B Manufacturing Co132 K & S Engineering74 Kraft R/C Electronics154 Kraft Systems51 Kress Technology132 Kustom Kraftsmanship128 LTA Systems162 Left Bank R/C Distributors150 Litco Systems11 Lone Star Models159 MACS Products132 Majestic Models124 Maxair Sports49 McDaniel R/C Service74 Jim Messers Quality Products128 Midwest Products Company128 Miniature Aircraft Supply133 Model Engineering Norwalk14 Model Merchant143 Model Rectifier Corp side Back Cover Modelmania153 Mutchiers144-145 Jerry Nelson & Co156 PARCS Club162 Pacific Sailpianes75 Peck-Polymers158 Pica Products153 Dave Platt Models Inc75 Plaza Hobbycraft148 Prop Shop24 RAC Products159 RF Enterprises129 RJL Industries156 RLF Products146 Repla-Tech International150 Roush Mfg Co157 Saf-Flite Models Sailplane Factory Satellite City Sheldons Hobby Shop Sig Manufacturing Co Bob Smith R/C Aircraft Sullivan Products rwings Tatone Products LR Taylor & Co Technopower II Inc. Top Flite Models r Hobbies Inc Twinn-K Inc US Quadra WE Technical Services Waterlines Williams Brothers Windsor Propeller Co World Engines - 150 147 24 13 - 148 135 84 - 28 - - 155 - 76 153 146 83 76 161 Back Cover CA Zaic Co119 Zenith Aviation Books2337 Nick Ziroli Models84 ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX ADVERTISERS INDEX FAI FID rules instituting special 50cm class explore possible rules configurations future Fl D models number people have suggested no need new class since 35cm class would accomplish same thing Whether valid point seeing 35cm models break 25 minutes blimp hangars Indoor Week 1982 week June 13-20 1982 will Indoor Week West Baden week begins abigClass AAAA-type Indoor meet jointly sponsored National Free Flight Society NFFS National Indoor Model Airplane Society NIMAS Illinois Model Aero Club IMAC Chicago Aeronuts contest will feature 14 model classes both formal AMA events nonAMA events such Bostonian two classes Indoor Speed Immediately after meet NIMAS VITNART meet will begin III World Peanut Gran Prix intertwined Gran Prix will run 24 hours continuously beginning 8 pm June 18 VIINART events will share flying space during June 19 Part fun festivities include three banquets contest cant get fill Indoor flying week youll never make details contact Bud Tenni PO Box 545 Richardson TX 75080 FF Old-Timers/Haught Continued page 69 something under 100 psi typically about 100 strokes pump Starting engine consists opening air valve sounds interesting ready challenge constructing own compressed air engine drop line Bert Pond 128 Warren Terrace Long Meadow MA 01106 Bert Dean Compressed-Air Engines has plans over 25 different engines well informa tive articles tank construction CA flying general Prices reasonable thought tinkering cutting filing soldering slows down Bert has limited quantity famous Hoosier Whirlwind threecylinder radials available complete tank ready hum Hoosier Whirlwind has engine beat since 1929 popular today SAM Champs compressed-air event promoted sponsored Tim Banaszak secretary-treasurer SAM engine paired up Hobart July 1982 163 writing advertisers meRtion read about Model Aviation SILK ~ OiScOuNtS ON $495/YD 50 YD ROLLS RedYellow Rool Blue Fine Qualily Model Building Any Lengtf Max 50 Yd SILK COVERS BEST LIGHT- STRONG- ECONOMICAL SHIPPING 0050 FOREIGN 150/ ORDER Id RES Add 4% BROWNSELL FLAG B DECAL CO 121 LAUREL ROAD NEW CITY NY 914-634-850010956