George M Mye Radio Thchnique 70 Froeblich Farm Rd Hicksville NY 1901 ABSTRACT Failsafe Flight System FFS SAFER RC FLYING may result use T&D Flight Systems Failsafe Flight System FFS product may find interesting unit Connects receiver place ofor parallel witha servo has several func tions 1 Emergency in-flight battery charger ckup flight battery 3 Sensitive voltmeter low-voltage alarm 4 Interference monitor 5 Lost airplane locator 6 Switch-position indicator admit being skeptical about entrusting airplane nine-volt transistor radio battery Alex asked about two years ago told him doubted idea would work So ran some tests did work got some other people fly unit worked too tested two models having list price $3995 FFS-l PWM Pulse-Width Modulation ordinary AM FM receivers FFS-2 PCM Pulse Code Modulation re ceivers share functions except FFS-l con tains pulse-omission detector Locator function FFS-2 uses timer instead difference brought about differences way PWM PCM receivers work Both FFS-I FFS-2 will work single- dualconversion receivers Lets examine func tions I Nicad Charger CHGboth models An onboard nine-volt transistor radio battery auto matically starts charging battery air plane whenever switch Ni-Cd pack terminal voltage drops below 47 VDC protects against dragging Ni-Cd pack down such low voltage cell damage possible actual charging current varies cause 9-VDC battery supplies current needed FFS units tested acted like very stiff 43-VDC voltage regulator once Ni-Cd pack dropped level 2 Backup Battery BUboth models fresh nine-volt transistor radio battery will operate airplane about 30 minutes event total failure Ni-Cd pack plugs become disconnected wires fail switches turn selves off cells fail etc 3 Low-VoIrge Alarm ESV/LVAboth mod els internal beeper sounds off whenever Ni-Cd battery voltage drops below 47 VDC sense could considered full-time ESV expanded-scale voltmeter because con tinually measures voltage receiver very pre cisely under actual load conditions alarm sounds before primary battery completely exhausted Model FFS-3 PCM available $2995 list has ESV LVA func tion relying low-voltage alarm some kind like automatic low throttle usually built PCM receivers receivers failsafe function can switched off PCM receiv ers isnt switched off failsafe s-i OFF ON ON ON ON ON ON ON d ON Locate/Inte Failsafe Fli Receiver s rransmitte Receiver vo Current Out Control function may set operate some voltage low 47 means could flying backup battery know Im enthu siastic about FFS-3 4 Interference Monitor TNT a Model FF5-I will switch air plane receiver before turning transmit ter beeper should sound steady tone dont hear beeper stutters have some kind problem may dead bat teries may somebody else already us ing channel may some kind inter ference hitting channel Whatever ye warned b Model FFS-2 cant tell about interfer ence because PCM receivers usually send servos failsafe position suffering inter ference PCM failsafe signal looks just like valid transmitter signal 5 Lost Airplane Locator LOC a Model FF5-I plane goes down tall corn switch transmitter off listen carefully may hear beeper calling b Model FFS-2 Eighteen minutes after unit switched beeper will sound havent found plane beeper may help find 6 Switch Position Indicator SPI a Model FFS-l turn trans mitter off beeper will sound immediately leave both transmitter receiver turned beeper will sound batteries run down LVA b Model FFS-2 hear beeper cry ing way home ie 18 minutes after turned receiver youve left something twitched again Both models provide wires connecting external noisemaker should have trouble hearing high-pitched beeper circuit board Note big lump beeper chosen after some smaller beepers failed flight due vibration encapsulated ep oxy resists vibration well big tin can functions resonator sound lens make sound seem louder order test FF5 cut aileron ex tender half assembled wires 32 Model Aviation Failsafe Flight System FF5-i its 9V Duracell power pack Georges aileron ex tender added see text Production units will come neat plastic case strain reliefs wires Unused wire pigtail connection external noisemaker supplied ones FFS unit joining three red wires three black wires three white wires set three wires insulated heat-shrink tub ing another piece big h/s tubing put over nest three junctions plugged extender receiver servo other end extender Three servos battery pack switch harness later ready go tested Model FFS-l World Engines Expert FM system Model FFS-2 Polks Chal lenger 550 PCM system both worked well matrix tests performed sum mary test results appear separate table units tried maintain voltage 433 Nicad Charger mode After running down charge Ni-Cds found stirred stick transmitter keep two ser yos moving continuously current drawn nine-volt battery jumped high 450 mA voltage receiver measured servo lead plugged receiver stayed 430 031-10 volts through stopped moving servos current subsided 65 mA shut off FFS let Ni-Cds drop 33 VDC under load idle flight pack As soon turned FFS back current went about 120 mA subsided 65 mA again once Ni-Cd pack charged back 433 VDC Alex says Duracells Energizers brands battery should use unitother brands sometimes satisfac tory according tests Remember way off manufacturers curve use nine-volt transistor radio battery way particular use lithium batteries have very long shelf lives cant supply large currents RC system will need time time voltage regulator circuit board will handle ampere complaining put 33-ohm/l0-watt resistor reasonably fresh nine-volt Energizer saw 15 amps 58 volts voltage dropped rapidly FUEL WIZZARD THE WORLDS FASTEST AND MOST CONVENIENT FUEL PUMP EVER * FITS ALL GALLON FUEL BOTTLES * FAST ONE STROKE LL OUNCE OF FUEL * ALL FUEL SAFE GLO FUEL & GASOLINE SUGGESTED RETAtL $995 NOW JUST $750 FILLS THE LARGEST MODEL FUEL TANKS IN SECONDS YOUR DEALER OR ORtER IIRECT PLEASE ENTER MY ORDER FORFUEL WIZZARDS AT $ 750 EACIt POSTAGE PAID NAMESTREET________________________ CITYSTATE________________ ZIP_________ ORDER FROM ACME PLASTIC PUMP CO P 0 BOX 24551 MINNEAPOLIS MN 55424 IEALER INQUIRIES INVITEI December 1989 33 George read about double crash occurred modelers use wrong frequency flag antenna re ported John Prestons Safety Comes First column June issue MA page 153 figured could happen him tool Solution put some stick-on RC channel num bers top front edge RC trans mitter owns Numbers came label sheets blank videotape cartridges lo cation harder overlook place manufacturer tags transmitter KIT J-1 F-16A Falcon WIngspan 15 41 E Lincoln Ave Hatfield PA 19440 215 361-8700 Available Favorite Hobby Shop Now! F-14A Tomcat SHOWN Wingspan 32 3295 four models TRUE SCALE reproductions popular Jet Fighters used US Allied Forces throughout world today Any models can built Display Catapault Launch Flying kit contains Diecut Balsa Parts Vac Formed Plastic Parts Decal rolled Plan Covering Tissue TAIBI 0 H36dTOIUsI 1iYi BALSA WOOD STICKS 1/16-INCH3648 1116111606 11163/3207 1/1601/60811 1/16r3/160913 1/1601/41015 1/16 3/61317 1/16 01/21620 1/16 3142128 3/32-INCH3646 3/323/320611 3/32s 1/60913 3/320 3/161015 3/321/41316 3/3203/61419 3/320 1/21621 3/320 3/42431 Double Balsa Wood Prices Spruce aod Bassorood Sbcks 1160 1/60611 1/603/161115 1/6o 1/41317 1/6 03/61621 1/6o 1/21724 1/603/42533 3/16-INCH3646 3/1603/161317 3/16o 1/41419 3/1603/61621 3/160 1/21625 3/16 0 3/42636 1/4-INCH3646 1/40141621 1/403/61825 1/4o1/22129 1/403/43142 5/16-INCH3646 511605/192027 5/1603/62230 5/1601/22736 5/16 0343652 3/6-INCH3646 3/60 3/62737 3/60 1/23041 3/60 3/44460 1/2-INCH3648 1/201/23746 1/203/45270 TRIANGULAR CUT BALSA 1/4o1/4o3624 3/6o3/6o3629 1/2 0 1/20 3637 314o3/4o3647 10103661 BALSA PLANKS 3/4o3o36176 102036164 103036230 104036303 2o2o36230 203036329 204036464 303036490 3o4o36660 BALSA SHEETS 1-INCH3646 1/160 12736 3/32 0 13640 1/6013344 3/160 13749 1/40 14157 3/6015372 1/20 16596 2-INCSI3646 1122023040 1/16e23646 3/32 e 24154 1/6024660 3/160 25472 1/4e26384 3/60 277103 11202113150 3-INCH3646 1/32034053 1/16034356 3/32 0 35270 1/6036060 3/160 37295 1/40364112 5/1603103134 3/603120160 1/203150200 4-INCH3646 1/32046567 1/160473101 3/32 0 462109 1/60495126 3/1604114181 1/404131193 3/604162271 1/204219325 BIRCH PLYWOOD 1/640120 12175 1/64012024350 l/64012o49700 1/64 046 0 492600 I/32o6o1252 1/320120 12105 1/32012024210 1/32 012046420 l/16o6o 1252 1/160120 12105 1/16 0120 24210 1/16 012049420 3/3206o1261 3/32012012163 3/32 012 024326 3/32 o12 o46652 1/60601269 1/60120 12179 1/6012024356 1/6 012046712 3/16o6o1274 3/160120 12146 3/160 12024293 3/160 12046565 1/40601274 1/40120 12146 1/4012024293 1/4012046565 3/6 0 12 0 12160 3/0 0 120 24360 3/6 0 12046720 1/20 120 12202 1/20 12024405 1/20 12046606 LITE PLYWOOD 1/6o12o1256 1/6 0 12 0 24112 1/6 0 120 46224 TAPERED TRAILING EDGE3646 1/60 1/22230 3/160 3/42940 1/40 14255 5/160 lVo4461 3/60 15272 Superior Aircraft Materials 12020-G Centralia iian Gardens California 90716 865-3220 Handling Charge -$500 $300 COD mum Order $2000 FOB Factory accept Personal checks COD fornia Residents add 6/% Sales Tax dont think want treat nine-volt transIs tor radio batteries way Drawing 450 mA normal tough enough margin regulator case somebody decides plug rechargeable things place nine-volt transistor battery can give current have less capacity will run down faster alkaline battery Im sat isfied fresh nine-volt Duracell will run ordinary radio four normal 450-mA stall current servos reasonable time According Duracell Inc data MN1604 battery sent Alex Kronfeld battery will discharge 90 48 volts working 5 10-ohm load produce av erage current 14 mA 40 hours Duracell quotes capacity 552 mAh Ill bet never expected find much power tiny package know didnt test data indicates fresh battery will run FFS about 40 hours Lost Airplane Locator mode didnt run high-current discharge test own see what capacity would under average drain something like 100 mA tak ing consideration another Alexs claim 30 minutes emergency operating time fresh battery seems adequately conservative backs endorsements eight local fliers have participated tests fresh fresh batteries can check terminal voltage beeper howling make estimate remaining ca pacity Deduct 130 mAh per volt readings low 90 So see 80 volts can esti mate 514-130 mAh remaining normal 10-minute flight after ground check interfer ence couple minutes pits will prob ably take away 30 mAh So never use Backup Battery Lost Airplane Locator func tion battery might good 170 flights two seasons flying people course youll have deduct few flights account loss capacity over time self discharge also known shelf life other hand want leave least five minutes panicky Backup Battery time pack d better throw battery away gets down 72 volts discharge curve resembles Ni-Cd battery last 30% capac ity goes away fast will begin preflight testing turning backup battery will notice servos have slowed down bit nine-volt battery voltage drops seven-volt level convenient way know change backup battery Just remember turn primary battery before fly units tested set up support fourcell Ni-Cd packs event run ning five cells Alex will build unit voltage cutoffs set situation Likewise running 200-mAh packs feed servos draw usual 450-mA stall current Alex will put bigger regulator sec ond case will have use larger nine-volt battery supply current need line thinking BFS-l Boat Failsafe planned also $3995 list will have two-amp voltage regulator jumper use four five Ni-Cd cells no locat function will usable either PWM PCM systems Continued page 156 Last Call Module 7SP ATRCS retro-fit program will end Lecember 31 1989 sure get conversion soon Stores four aircraft setups Includes seven different servo configurations Individual surface travel limits centering Single switch presets launch speed modes Full trailing edge control Enhanced mixing functions Crow landing capability User selectable cross trim capability ATRCSTM Advaaced Technoloej Radio Control Syatem Converts Module 7SP advanced computerized control system Flap Stick reversing Elevator camber VTR Automatic selection high ail rudder mixing launch landing modes Control Systems Laboratories 238 S Hillview Dr Milpitas CA 95035 408 946-4142 AirtronilM Module 7SP registered 34 Model Aviation GATOR RIC PRODUCTS DELUX ALL BALSA KIT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing offI balsa kit machined wood parts complete lsardware package includes plug-in djustable stab parts new wing mounts Wing Span- 72 inWing Ara 860 sq Complete Delux KitSI 5995 TRANSMITTER CASE An inexpensive rugged molded case protect expensive transmitter both two stick single stick transmitters Black leather grain aluminum trim locking clasp SI 995 MV-I TYPHOON New F3A competition Big beautiful flyer balsa construction plug-in wings 120 four stroke 60 two stroke power Plans-two sheets S 1495 Fiberglass cowl Si 595 Clear butyrate canopy. 5 995 OTHER PLANS Tiger Tail 4S-two sheets 120 four strokesS 1495 TAR baby 120 four strokes51195 Alley Kat 40 size trainer sportS 895 Gator Flea 40 size sport5 895 Bobcat 40 size sportS 895 feather Ilte glass cloth 7 ozsq yd est weave Fastest Filling test Finished Weight Big 3 Sq Yard Pkg Oetailed Instructions- $895 Include $2 SOlItem UPS esidents Add 6% Sales Tax GATOR RIC PRODUCTS 3713 Pompano Dr acola FL 32514 4768639 Letters Editor Continued page 12 Ken opened hobby shop Burk & Company Department Store after World War II worked him full-time year until started college After worked part-time until completing college Milton H Fanning Nashville TN Safety/Preston Continued page 22 some MonoKote repairs moral tale wise keep small extinguisher field box As alter native may possible smother fire towel rag blanket Cub Yellow engine cowling first RC model powered Cox 09 began turn first orange brown able smother fire wrap ping rag around front model Have safe month Keytwo/Randoiph Continued page 30 der everything place range check equipmentand its time fly Flying has wide performance en velope compared Paskey Keytwo basically quite gentle flier Whether upright inverted stall shows abso lutely no tendency snap fact model balanced correctly its very diffi cult make snap snaps bag move center-of-gravity aft about /2 increase elevator throw rate /16 up down movement trailing edge aile rons about right comfortable flying Landings can made nose-high slow full aileron control way touch down problem knife-edge flight first airplane persistently climbed half-loop until learned nose stayed up just little rudder Once Id mastered technique knife-edge loops included Keytwos repertoire tricks what did Eddie Williams have say about latest re-creation see youve built another Paskey said unsung maestro drunken pilot routine Its about time Play again Eddie Radio Technique/Myers Continued page 34 Failsafe Flight System small 15 sq light less ounce inexpensive has very low operating current 70 mA works no doubt nine-volt transistor radio batteries expensive about $250 Duracells live will last long time some chance will get care less let run down some critical time unit meets its claims follow admonition use fresh batteries check servo speed during preflight inspection careless youll probably crash some other reason anyway Failsafe Flight System @ $3995 list T&D Flight Systems PO Box 1782 Staten Island NY 10314 additional information call Alex Kronfeld l-7t8/984-9121 Propeller Noise Continued page 42 cause poor community relations Much cure will depend upon education Modelers need understand nature problem order properly utilize solu tions article has introduced propel ler noise problem provided some neces sary background Subsequent articles will explain test results greater detail describe what modeler can achieve better aircraft performance less noise RC Soaring/Blakeslee Continued page 49 down hes hoping arrange factur ers demonstrations during meet would flying demos followed show-andtell sessions guys like Byron Bruce Combat Models Marty Silberstein Steve Peacock Cliff Hangar Models Brian Laird Paul Masura Slope Scale Models Other Id imagine itll much like fabulously suc cessful Richland Scale Slope Fun Flyie fly want long have pin Info available writing Charley SSN 2601 E 19th 51 #29 Signal Hill CA 90804 Better call him 1-213/494-3712 1990 Soaring contests Ray Hayes Vice Presi dent LSF wrote remind us now time plan next years big contests Spe cifically Ray talking about every-evenyear LSF Regionals annual NSS Soar-Ins put go-ahead clubs around coun try Theyre bit expensive Ray hoping Continue tradition awarding beautiful LSF plaques LSF Regionals Theyre worth winning Ray also hoping three super con tests NSS Masters LSF Nationals AMA Nats can spread around country 1990 contests West Coast 89 Ray afraid guys east Kansas beginning feel left out youd like info LSF Regionals check Ray 69598 Brookhill Dr Romeo MI 48065 phone 1-313/ 752-6163 NSS Soar-Ins have handled Marshall Long past few years assume youre 90 Marshall Marshalls address 824 Garden Meadow Universal City TX 78148 worry East Coasters hear Nats will Lawrenceville IL 90 RC Aerobatics/Van Putte Continued page 51 aerodynamic center segment wing Youll note root segment tip another segment Figure 4 shows geometric technique solu tion Remember aerodynamic center panel 25% point mean aerody namic chord panel Once youve determined aerodynamic cen ter panel must calculate area panel using Equation 2 measure distance convenient line aerody namic centers panels Figure 4 shows con venient reference line distance re spective aerodynamic centers distance back reference line aerodynamic center wing located determined Equation 3 mean aerodynamic chord complete wing calculated individual values shown Equation 4 looks just like equa tion determining distance wing aero dynamic center doesnt should since 156 Model Aviation
Edition: Model Aviation - 1989/12
Page Numbers: 32, 33, 34, 156
George M Mye Radio Thchnique 70 Froeblich Farm Rd Hicksville NY 1901 ABSTRACT Failsafe Flight System FFS SAFER RC FLYING may result use T&D Flight Systems Failsafe Flight System FFS product may find interesting unit Connects receiver place ofor parallel witha servo has several func tions 1 Emergency in-flight battery charger ckup flight battery 3 Sensitive voltmeter low-voltage alarm 4 Interference monitor 5 Lost airplane locator 6 Switch-position indicator admit being skeptical about entrusting airplane nine-volt transistor radio battery Alex asked about two years ago told him doubted idea would work So ran some tests did work got some other people fly unit worked too tested two models having list price $3995 FFS-l PWM Pulse-Width Modulation ordinary AM FM receivers FFS-2 PCM Pulse Code Modulation re ceivers share functions except FFS-l con tains pulse-omission detector Locator function FFS-2 uses timer instead difference brought about differences way PWM PCM receivers work Both FFS-I FFS-2 will work single- dualconversion receivers Lets examine func tions I Nicad Charger CHGboth models An onboard nine-volt transistor radio battery auto matically starts charging battery air plane whenever switch Ni-Cd pack terminal voltage drops below 47 VDC protects against dragging Ni-Cd pack down such low voltage cell damage possible actual charging current varies cause 9-VDC battery supplies current needed FFS units tested acted like very stiff 43-VDC voltage regulator once Ni-Cd pack dropped level 2 Backup Battery BUboth models fresh nine-volt transistor radio battery will operate airplane about 30 minutes event total failure Ni-Cd pack plugs become disconnected wires fail switches turn selves off cells fail etc 3 Low-VoIrge Alarm ESV/LVAboth mod els internal beeper sounds off whenever Ni-Cd battery voltage drops below 47 VDC sense could considered full-time ESV expanded-scale voltmeter because con tinually measures voltage receiver very pre cisely under actual load conditions alarm sounds before primary battery completely exhausted Model FFS-3 PCM available $2995 list has ESV LVA func tion relying low-voltage alarm some kind like automatic low throttle usually built PCM receivers receivers failsafe function can switched off PCM receiv ers isnt switched off failsafe s-i OFF ON ON ON ON ON ON ON d ON Locate/Inte Failsafe Fli Receiver s rransmitte Receiver vo Current Out Control function may set operate some voltage low 47 means could flying backup battery know Im enthu siastic about FFS-3 4 Interference Monitor TNT a Model FF5-I will switch air plane receiver before turning transmit ter beeper should sound steady tone dont hear beeper stutters have some kind problem may dead bat teries may somebody else already us ing channel may some kind inter ference hitting channel Whatever ye warned b Model FFS-2 cant tell about interfer ence because PCM receivers usually send servos failsafe position suffering inter ference PCM failsafe signal looks just like valid transmitter signal 5 Lost Airplane Locator LOC a Model FF5-I plane goes down tall corn switch transmitter off listen carefully may hear beeper calling b Model FFS-2 Eighteen minutes after unit switched beeper will sound havent found plane beeper may help find 6 Switch Position Indicator SPI a Model FFS-l turn trans mitter off beeper will sound immediately leave both transmitter receiver turned beeper will sound batteries run down LVA b Model FFS-2 hear beeper cry ing way home ie 18 minutes after turned receiver youve left something twitched again Both models provide wires connecting external noisemaker should have trouble hearing high-pitched beeper circuit board Note big lump beeper chosen after some smaller beepers failed flight due vibration encapsulated ep oxy resists vibration well big tin can functions resonator sound lens make sound seem louder order test FF5 cut aileron ex tender half assembled wires 32 Model Aviation Failsafe Flight System FF5-i its 9V Duracell power pack Georges aileron ex tender added see text Production units will come neat plastic case strain reliefs wires Unused wire pigtail connection external noisemaker supplied ones FFS unit joining three red wires three black wires three white wires set three wires insulated heat-shrink tub ing another piece big h/s tubing put over nest three junctions plugged extender receiver servo other end extender Three servos battery pack switch harness later ready go tested Model FFS-l World Engines Expert FM system Model FFS-2 Polks Chal lenger 550 PCM system both worked well matrix tests performed sum mary test results appear separate table units tried maintain voltage 433 Nicad Charger mode After running down charge Ni-Cds found stirred stick transmitter keep two ser yos moving continuously current drawn nine-volt battery jumped high 450 mA voltage receiver measured servo lead plugged receiver stayed 430 031-10 volts through stopped moving servos current subsided 65 mA shut off FFS let Ni-Cds drop 33 VDC under load idle flight pack As soon turned FFS back current went about 120 mA subsided 65 mA again once Ni-Cd pack charged back 433 VDC Alex says Duracells Energizers brands battery should use unitother brands sometimes satisfac tory according tests Remember way off manufacturers curve use nine-volt transistor radio battery way particular use lithium batteries have very long shelf lives cant supply large currents RC system will need time time voltage regulator circuit board will handle ampere complaining put 33-ohm/l0-watt resistor reasonably fresh nine-volt Energizer saw 15 amps 58 volts voltage dropped rapidly FUEL WIZZARD THE WORLDS FASTEST AND MOST CONVENIENT FUEL PUMP EVER * FITS ALL GALLON FUEL BOTTLES * FAST ONE STROKE LL OUNCE OF FUEL * ALL FUEL SAFE GLO FUEL & GASOLINE SUGGESTED RETAtL $995 NOW JUST $750 FILLS THE LARGEST MODEL FUEL TANKS IN SECONDS YOUR DEALER OR ORtER IIRECT PLEASE ENTER MY ORDER FORFUEL WIZZARDS AT $ 750 EACIt POSTAGE PAID NAMESTREET________________________ CITYSTATE________________ ZIP_________ ORDER FROM ACME PLASTIC PUMP CO P 0 BOX 24551 MINNEAPOLIS MN 55424 IEALER INQUIRIES INVITEI December 1989 33 George read about double crash occurred modelers use wrong frequency flag antenna re ported John Prestons Safety Comes First column June issue MA page 153 figured could happen him tool Solution put some stick-on RC channel num bers top front edge RC trans mitter owns Numbers came label sheets blank videotape cartridges lo cation harder overlook place manufacturer tags transmitter KIT J-1 F-16A Falcon WIngspan 15 41 E Lincoln Ave Hatfield PA 19440 215 361-8700 Available Favorite Hobby Shop Now! F-14A Tomcat SHOWN Wingspan 32 3295 four models TRUE SCALE reproductions popular Jet Fighters used US Allied Forces throughout world today Any models can built Display Catapault Launch Flying kit contains Diecut Balsa Parts Vac Formed Plastic Parts Decal rolled Plan Covering Tissue TAIBI 0 H36dTOIUsI 1iYi BALSA WOOD STICKS 1/16-INCH3648 1116111606 11163/3207 1/1601/60811 1/16r3/160913 1/1601/41015 1/16 3/61317 1/16 01/21620 1/16 3142128 3/32-INCH3646 3/323/320611 3/32s 1/60913 3/320 3/161015 3/321/41316 3/3203/61419 3/320 1/21621 3/320 3/42431 Double Balsa Wood Prices Spruce aod Bassorood Sbcks 1160 1/60611 1/603/161115 1/6o 1/41317 1/6 03/61621 1/6o 1/21724 1/603/42533 3/16-INCH3646 3/1603/161317 3/16o 1/41419 3/1603/61621 3/160 1/21625 3/16 0 3/42636 1/4-INCH3646 1/40141621 1/403/61825 1/4o1/22129 1/403/43142 5/16-INCH3646 511605/192027 5/1603/62230 5/1601/22736 5/16 0343652 3/6-INCH3646 3/60 3/62737 3/60 1/23041 3/60 3/44460 1/2-INCH3648 1/201/23746 1/203/45270 TRIANGULAR CUT BALSA 1/4o1/4o3624 3/6o3/6o3629 1/2 0 1/20 3637 314o3/4o3647 10103661 BALSA PLANKS 3/4o3o36176 102036164 103036230 104036303 2o2o36230 203036329 204036464 303036490 3o4o36660 BALSA SHEETS 1-INCH3646 1/160 12736 3/32 0 13640 1/6013344 3/160 13749 1/40 14157 3/6015372 1/20 16596 2-INCSI3646 1122023040 1/16e23646 3/32 e 24154 1/6024660 3/160 25472 1/4e26384 3/60 277103 11202113150 3-INCH3646 1/32034053 1/16034356 3/32 0 35270 1/6036060 3/160 37295 1/40364112 5/1603103134 3/603120160 1/203150200 4-INCH3646 1/32046567 1/160473101 3/32 0 462109 1/60495126 3/1604114181 1/404131193 3/604162271 1/204219325 BIRCH PLYWOOD 1/640120 12175 1/64012024350 l/64012o49700 1/64 046 0 492600 I/32o6o1252 1/320120 12105 1/32012024210 1/32 012046420 l/16o6o 1252 1/160120 12105 1/16 0120 24210 1/16 012049420 3/3206o1261 3/32012012163 3/32 012 024326 3/32 o12 o46652 1/60601269 1/60120 12179 1/6012024356 1/6 012046712 3/16o6o1274 3/160120 12146 3/160 12024293 3/160 12046565 1/40601274 1/40120 12146 1/4012024293 1/4012046565 3/6 0 12 0 12160 3/0 0 120 24360 3/6 0 12046720 1/20 120 12202 1/20 12024405 1/20 12046606 LITE PLYWOOD 1/6o12o1256 1/6 0 12 0 24112 1/6 0 120 46224 TAPERED TRAILING EDGE3646 1/60 1/22230 3/160 3/42940 1/40 14255 5/160 lVo4461 3/60 15272 Superior Aircraft Materials 12020-G Centralia iian Gardens California 90716 865-3220 Handling Charge -$500 $300 COD mum Order $2000 FOB Factory accept Personal checks COD fornia Residents add 6/% Sales Tax dont think want treat nine-volt transIs tor radio batteries way Drawing 450 mA normal tough enough margin regulator case somebody decides plug rechargeable things place nine-volt transistor battery can give current have less capacity will run down faster alkaline battery Im sat isfied fresh nine-volt Duracell will run ordinary radio four normal 450-mA stall current servos reasonable time According Duracell Inc data MN1604 battery sent Alex Kronfeld battery will discharge 90 48 volts working 5 10-ohm load produce av erage current 14 mA 40 hours Duracell quotes capacity 552 mAh Ill bet never expected find much power tiny package know didnt test data indicates fresh battery will run FFS about 40 hours Lost Airplane Locator mode didnt run high-current discharge test own see what capacity would under average drain something like 100 mA tak ing consideration another Alexs claim 30 minutes emergency operating time fresh battery seems adequately conservative backs endorsements eight local fliers have participated tests fresh fresh batteries can check terminal voltage beeper howling make estimate remaining ca pacity Deduct 130 mAh per volt readings low 90 So see 80 volts can esti mate 514-130 mAh remaining normal 10-minute flight after ground check interfer ence couple minutes pits will prob ably take away 30 mAh So never use Backup Battery Lost Airplane Locator func tion battery might good 170 flights two seasons flying people course youll have deduct few flights account loss capacity over time self discharge also known shelf life other hand want leave least five minutes panicky Backup Battery time pack d better throw battery away gets down 72 volts discharge curve resembles Ni-Cd battery last 30% capac ity goes away fast will begin preflight testing turning backup battery will notice servos have slowed down bit nine-volt battery voltage drops seven-volt level convenient way know change backup battery Just remember turn primary battery before fly units tested set up support fourcell Ni-Cd packs event run ning five cells Alex will build unit voltage cutoffs set situation Likewise running 200-mAh packs feed servos draw usual 450-mA stall current Alex will put bigger regulator sec ond case will have use larger nine-volt battery supply current need line thinking BFS-l Boat Failsafe planned also $3995 list will have two-amp voltage regulator jumper use four five Ni-Cd cells no locat function will usable either PWM PCM systems Continued page 156 Last Call Module 7SP ATRCS retro-fit program will end Lecember 31 1989 sure get conversion soon Stores four aircraft setups Includes seven different servo configurations Individual surface travel limits centering Single switch presets launch speed modes Full trailing edge control Enhanced mixing functions Crow landing capability User selectable cross trim capability ATRCSTM Advaaced Technoloej Radio Control Syatem Converts Module 7SP advanced computerized control system Flap Stick reversing Elevator camber VTR Automatic selection high ail rudder mixing launch landing modes Control Systems Laboratories 238 S Hillview Dr Milpitas CA 95035 408 946-4142 AirtronilM Module 7SP registered 34 Model Aviation GATOR RIC PRODUCTS DELUX ALL BALSA KIT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing offI balsa kit machined wood parts complete lsardware package includes plug-in djustable stab parts new wing mounts Wing Span- 72 inWing Ara 860 sq Complete Delux KitSI 5995 TRANSMITTER CASE An inexpensive rugged molded case protect expensive transmitter both two stick single stick transmitters Black leather grain aluminum trim locking clasp SI 995 MV-I TYPHOON New F3A competition Big beautiful flyer balsa construction plug-in wings 120 four stroke 60 two stroke power Plans-two sheets S 1495 Fiberglass cowl Si 595 Clear butyrate canopy. 5 995 OTHER PLANS Tiger Tail 4S-two sheets 120 four strokesS 1495 TAR baby 120 four strokes51195 Alley Kat 40 size trainer sportS 895 Gator Flea 40 size sport5 895 Bobcat 40 size sportS 895 feather Ilte glass cloth 7 ozsq yd est weave Fastest Filling test Finished Weight Big 3 Sq Yard Pkg Oetailed Instructions- $895 Include $2 SOlItem UPS esidents Add 6% Sales Tax GATOR RIC PRODUCTS 3713 Pompano Dr acola FL 32514 4768639 Letters Editor Continued page 12 Ken opened hobby shop Burk & Company Department Store after World War II worked him full-time year until started college After worked part-time until completing college Milton H Fanning Nashville TN Safety/Preston Continued page 22 some MonoKote repairs moral tale wise keep small extinguisher field box As alter native may possible smother fire towel rag blanket Cub Yellow engine cowling first RC model powered Cox 09 began turn first orange brown able smother fire wrap ping rag around front model Have safe month Keytwo/Randoiph Continued page 30 der everything place range check equipmentand its time fly Flying has wide performance en velope compared Paskey Keytwo basically quite gentle flier Whether upright inverted stall shows abso lutely no tendency snap fact model balanced correctly its very diffi cult make snap snaps bag move center-of-gravity aft about /2 increase elevator throw rate /16 up down movement trailing edge aile rons about right comfortable flying Landings can made nose-high slow full aileron control way touch down problem knife-edge flight first airplane persistently climbed half-loop until learned nose stayed up just little rudder Once Id mastered technique knife-edge loops included Keytwos repertoire tricks what did Eddie Williams have say about latest re-creation see youve built another Paskey said unsung maestro drunken pilot routine Its about time Play again Eddie Radio Technique/Myers Continued page 34 Failsafe Flight System small 15 sq light less ounce inexpensive has very low operating current 70 mA works no doubt nine-volt transistor radio batteries expensive about $250 Duracells live will last long time some chance will get care less let run down some critical time unit meets its claims follow admonition use fresh batteries check servo speed during preflight inspection careless youll probably crash some other reason anyway Failsafe Flight System @ $3995 list T&D Flight Systems PO Box 1782 Staten Island NY 10314 additional information call Alex Kronfeld l-7t8/984-9121 Propeller Noise Continued page 42 cause poor community relations Much cure will depend upon education Modelers need understand nature problem order properly utilize solu tions article has introduced propel ler noise problem provided some neces sary background Subsequent articles will explain test results greater detail describe what modeler can achieve better aircraft performance less noise RC Soaring/Blakeslee Continued page 49 down hes hoping arrange factur ers demonstrations during meet would flying demos followed show-andtell sessions guys like Byron Bruce Combat Models Marty Silberstein Steve Peacock Cliff Hangar Models Brian Laird Paul Masura Slope Scale Models Other Id imagine itll much like fabulously suc cessful Richland Scale Slope Fun Flyie fly want long have pin Info available writing Charley SSN 2601 E 19th 51 #29 Signal Hill CA 90804 Better call him 1-213/494-3712 1990 Soaring contests Ray Hayes Vice Presi dent LSF wrote remind us now time plan next years big contests Spe cifically Ray talking about every-evenyear LSF Regionals annual NSS Soar-Ins put go-ahead clubs around coun try Theyre bit expensive Ray hoping Continue tradition awarding beautiful LSF plaques LSF Regionals Theyre worth winning Ray also hoping three super con tests NSS Masters LSF Nationals AMA Nats can spread around country 1990 contests West Coast 89 Ray afraid guys east Kansas beginning feel left out youd like info LSF Regionals check Ray 69598 Brookhill Dr Romeo MI 48065 phone 1-313/ 752-6163 NSS Soar-Ins have handled Marshall Long past few years assume youre 90 Marshall Marshalls address 824 Garden Meadow Universal City TX 78148 worry East Coasters hear Nats will Lawrenceville IL 90 RC Aerobatics/Van Putte Continued page 51 aerodynamic center segment wing Youll note root segment tip another segment Figure 4 shows geometric technique solu tion Remember aerodynamic center panel 25% point mean aerody namic chord panel Once youve determined aerodynamic cen ter panel must calculate area panel using Equation 2 measure distance convenient line aerody namic centers panels Figure 4 shows con venient reference line distance re spective aerodynamic centers distance back reference line aerodynamic center wing located determined Equation 3 mean aerodynamic chord complete wing calculated individual values shown Equation 4 looks just like equa tion determining distance wing aero dynamic center doesnt should since 156 Model Aviation
Edition: Model Aviation - 1989/12
Page Numbers: 32, 33, 34, 156
George M Mye Radio Thchnique 70 Froeblich Farm Rd Hicksville NY 1901 ABSTRACT Failsafe Flight System FFS SAFER RC FLYING may result use T&D Flight Systems Failsafe Flight System FFS product may find interesting unit Connects receiver place ofor parallel witha servo has several func tions 1 Emergency in-flight battery charger ckup flight battery 3 Sensitive voltmeter low-voltage alarm 4 Interference monitor 5 Lost airplane locator 6 Switch-position indicator admit being skeptical about entrusting airplane nine-volt transistor radio battery Alex asked about two years ago told him doubted idea would work So ran some tests did work got some other people fly unit worked too tested two models having list price $3995 FFS-l PWM Pulse-Width Modulation ordinary AM FM receivers FFS-2 PCM Pulse Code Modulation re ceivers share functions except FFS-l con tains pulse-omission detector Locator function FFS-2 uses timer instead difference brought about differences way PWM PCM receivers work Both FFS-I FFS-2 will work single- dualconversion receivers Lets examine func tions I Nicad Charger CHGboth models An onboard nine-volt transistor radio battery auto matically starts charging battery air plane whenever switch Ni-Cd pack terminal voltage drops below 47 VDC protects against dragging Ni-Cd pack down such low voltage cell damage possible actual charging current varies cause 9-VDC battery supplies current needed FFS units tested acted like very stiff 43-VDC voltage regulator once Ni-Cd pack dropped level 2 Backup Battery BUboth models fresh nine-volt transistor radio battery will operate airplane about 30 minutes event total failure Ni-Cd pack plugs become disconnected wires fail switches turn selves off cells fail etc 3 Low-VoIrge Alarm ESV/LVAboth mod els internal beeper sounds off whenever Ni-Cd battery voltage drops below 47 VDC sense could considered full-time ESV expanded-scale voltmeter because con tinually measures voltage receiver very pre cisely under actual load conditions alarm sounds before primary battery completely exhausted Model FFS-3 PCM available $2995 list has ESV LVA func tion relying low-voltage alarm some kind like automatic low throttle usually built PCM receivers receivers failsafe function can switched off PCM receiv ers isnt switched off failsafe s-i OFF ON ON ON ON ON ON ON d ON Locate/Inte Failsafe Fli Receiver s rransmitte Receiver vo Current Out Control function may set operate some voltage low 47 means could flying backup battery know Im enthu siastic about FFS-3 4 Interference Monitor TNT a Model FF5-I will switch air plane receiver before turning transmit ter beeper should sound steady tone dont hear beeper stutters have some kind problem may dead bat teries may somebody else already us ing channel may some kind inter ference hitting channel Whatever ye warned b Model FFS-2 cant tell about interfer ence because PCM receivers usually send servos failsafe position suffering inter ference PCM failsafe signal looks just like valid transmitter signal 5 Lost Airplane Locator LOC a Model FF5-I plane goes down tall corn switch transmitter off listen carefully may hear beeper calling b Model FFS-2 Eighteen minutes after unit switched beeper will sound havent found plane beeper may help find 6 Switch Position Indicator SPI a Model FFS-l turn trans mitter off beeper will sound immediately leave both transmitter receiver turned beeper will sound batteries run down LVA b Model FFS-2 hear beeper cry ing way home ie 18 minutes after turned receiver youve left something twitched again Both models provide wires connecting external noisemaker should have trouble hearing high-pitched beeper circuit board Note big lump beeper chosen after some smaller beepers failed flight due vibration encapsulated ep oxy resists vibration well big tin can functions resonator sound lens make sound seem louder order test FF5 cut aileron ex tender half assembled wires 32 Model Aviation Failsafe Flight System FF5-i its 9V Duracell power pack Georges aileron ex tender added see text Production units will come neat plastic case strain reliefs wires Unused wire pigtail connection external noisemaker supplied ones FFS unit joining three red wires three black wires three white wires set three wires insulated heat-shrink tub ing another piece big h/s tubing put over nest three junctions plugged extender receiver servo other end extender Three servos battery pack switch harness later ready go tested Model FFS-l World Engines Expert FM system Model FFS-2 Polks Chal lenger 550 PCM system both worked well matrix tests performed sum mary test results appear separate table units tried maintain voltage 433 Nicad Charger mode After running down charge Ni-Cds found stirred stick transmitter keep two ser yos moving continuously current drawn nine-volt battery jumped high 450 mA voltage receiver measured servo lead plugged receiver stayed 430 031-10 volts through stopped moving servos current subsided 65 mA shut off FFS let Ni-Cds drop 33 VDC under load idle flight pack As soon turned FFS back current went about 120 mA subsided 65 mA again once Ni-Cd pack charged back 433 VDC Alex says Duracells Energizers brands battery should use unitother brands sometimes satisfac tory according tests Remember way off manufacturers curve use nine-volt transistor radio battery way particular use lithium batteries have very long shelf lives cant supply large currents RC system will need time time voltage regulator circuit board will handle ampere complaining put 33-ohm/l0-watt resistor reasonably fresh nine-volt Energizer saw 15 amps 58 volts voltage dropped rapidly FUEL WIZZARD THE WORLDS FASTEST AND MOST CONVENIENT FUEL PUMP EVER * FITS ALL GALLON FUEL BOTTLES * FAST ONE STROKE LL OUNCE OF FUEL * ALL FUEL SAFE GLO FUEL & GASOLINE SUGGESTED RETAtL $995 NOW JUST $750 FILLS THE LARGEST MODEL FUEL TANKS IN SECONDS YOUR DEALER OR ORtER IIRECT PLEASE ENTER MY ORDER FORFUEL WIZZARDS AT $ 750 EACIt POSTAGE PAID NAMESTREET________________________ CITYSTATE________________ ZIP_________ ORDER FROM ACME PLASTIC PUMP CO P 0 BOX 24551 MINNEAPOLIS MN 55424 IEALER INQUIRIES INVITEI December 1989 33 George read about double crash occurred modelers use wrong frequency flag antenna re ported John Prestons Safety Comes First column June issue MA page 153 figured could happen him tool Solution put some stick-on RC channel num bers top front edge RC trans mitter owns Numbers came label sheets blank videotape cartridges lo cation harder overlook place manufacturer tags transmitter KIT J-1 F-16A Falcon WIngspan 15 41 E Lincoln Ave Hatfield PA 19440 215 361-8700 Available Favorite Hobby Shop Now! F-14A Tomcat SHOWN Wingspan 32 3295 four models TRUE SCALE reproductions popular Jet Fighters used US Allied Forces throughout world today Any models can built Display Catapault Launch Flying kit contains Diecut Balsa Parts Vac Formed Plastic Parts Decal rolled Plan Covering Tissue TAIBI 0 H36dTOIUsI 1iYi BALSA WOOD STICKS 1/16-INCH3648 1116111606 11163/3207 1/1601/60811 1/16r3/160913 1/1601/41015 1/16 3/61317 1/16 01/21620 1/16 3142128 3/32-INCH3646 3/323/320611 3/32s 1/60913 3/320 3/161015 3/321/41316 3/3203/61419 3/320 1/21621 3/320 3/42431 Double Balsa Wood Prices Spruce aod Bassorood Sbcks 1160 1/60611 1/603/161115 1/6o 1/41317 1/6 03/61621 1/6o 1/21724 1/603/42533 3/16-INCH3646 3/1603/161317 3/16o 1/41419 3/1603/61621 3/160 1/21625 3/16 0 3/42636 1/4-INCH3646 1/40141621 1/403/61825 1/4o1/22129 1/403/43142 5/16-INCH3646 511605/192027 5/1603/62230 5/1601/22736 5/16 0343652 3/6-INCH3646 3/60 3/62737 3/60 1/23041 3/60 3/44460 1/2-INCH3648 1/201/23746 1/203/45270 TRIANGULAR CUT BALSA 1/4o1/4o3624 3/6o3/6o3629 1/2 0 1/20 3637 314o3/4o3647 10103661 BALSA PLANKS 3/4o3o36176 102036164 103036230 104036303 2o2o36230 203036329 204036464 303036490 3o4o36660 BALSA SHEETS 1-INCH3646 1/160 12736 3/32 0 13640 1/6013344 3/160 13749 1/40 14157 3/6015372 1/20 16596 2-INCSI3646 1122023040 1/16e23646 3/32 e 24154 1/6024660 3/160 25472 1/4e26384 3/60 277103 11202113150 3-INCH3646 1/32034053 1/16034356 3/32 0 35270 1/6036060 3/160 37295 1/40364112 5/1603103134 3/603120160 1/203150200 4-INCH3646 1/32046567 1/160473101 3/32 0 462109 1/60495126 3/1604114181 1/404131193 3/604162271 1/204219325 BIRCH PLYWOOD 1/640120 12175 1/64012024350 l/64012o49700 1/64 046 0 492600 I/32o6o1252 1/320120 12105 1/32012024210 1/32 012046420 l/16o6o 1252 1/160120 12105 1/16 0120 24210 1/16 012049420 3/3206o1261 3/32012012163 3/32 012 024326 3/32 o12 o46652 1/60601269 1/60120 12179 1/6012024356 1/6 012046712 3/16o6o1274 3/160120 12146 3/160 12024293 3/160 12046565 1/40601274 1/40120 12146 1/4012024293 1/4012046565 3/6 0 12 0 12160 3/0 0 120 24360 3/6 0 12046720 1/20 120 12202 1/20 12024405 1/20 12046606 LITE PLYWOOD 1/6o12o1256 1/6 0 12 0 24112 1/6 0 120 46224 TAPERED TRAILING EDGE3646 1/60 1/22230 3/160 3/42940 1/40 14255 5/160 lVo4461 3/60 15272 Superior Aircraft Materials 12020-G Centralia iian Gardens California 90716 865-3220 Handling Charge -$500 $300 COD mum Order $2000 FOB Factory accept Personal checks COD fornia Residents add 6/% Sales Tax dont think want treat nine-volt transIs tor radio batteries way Drawing 450 mA normal tough enough margin regulator case somebody decides plug rechargeable things place nine-volt transistor battery can give current have less capacity will run down faster alkaline battery Im sat isfied fresh nine-volt Duracell will run ordinary radio four normal 450-mA stall current servos reasonable time According Duracell Inc data MN1604 battery sent Alex Kronfeld battery will discharge 90 48 volts working 5 10-ohm load produce av erage current 14 mA 40 hours Duracell quotes capacity 552 mAh Ill bet never expected find much power tiny package know didnt test data indicates fresh battery will run FFS about 40 hours Lost Airplane Locator mode didnt run high-current discharge test own see what capacity would under average drain something like 100 mA tak ing consideration another Alexs claim 30 minutes emergency operating time fresh battery seems adequately conservative backs endorsements eight local fliers have participated tests fresh fresh batteries can check terminal voltage beeper howling make estimate remaining ca pacity Deduct 130 mAh per volt readings low 90 So see 80 volts can esti mate 514-130 mAh remaining normal 10-minute flight after ground check interfer ence couple minutes pits will prob ably take away 30 mAh So never use Backup Battery Lost Airplane Locator func tion battery might good 170 flights two seasons flying people course youll have deduct few flights account loss capacity over time self discharge also known shelf life other hand want leave least five minutes panicky Backup Battery time pack d better throw battery away gets down 72 volts discharge curve resembles Ni-Cd battery last 30% capac ity goes away fast will begin preflight testing turning backup battery will notice servos have slowed down bit nine-volt battery voltage drops seven-volt level convenient way know change backup battery Just remember turn primary battery before fly units tested set up support fourcell Ni-Cd packs event run ning five cells Alex will build unit voltage cutoffs set situation Likewise running 200-mAh packs feed servos draw usual 450-mA stall current Alex will put bigger regulator sec ond case will have use larger nine-volt battery supply current need line thinking BFS-l Boat Failsafe planned also $3995 list will have two-amp voltage regulator jumper use four five Ni-Cd cells no locat function will usable either PWM PCM systems Continued page 156 Last Call Module 7SP ATRCS retro-fit program will end Lecember 31 1989 sure get conversion soon Stores four aircraft setups Includes seven different servo configurations Individual surface travel limits centering Single switch presets launch speed modes Full trailing edge control Enhanced mixing functions Crow landing capability User selectable cross trim capability ATRCSTM Advaaced Technoloej Radio Control Syatem Converts Module 7SP advanced computerized control system Flap Stick reversing Elevator camber VTR Automatic selection high ail rudder mixing launch landing modes Control Systems Laboratories 238 S Hillview Dr Milpitas CA 95035 408 946-4142 AirtronilM Module 7SP registered 34 Model Aviation GATOR RIC PRODUCTS DELUX ALL BALSA KIT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing offI balsa kit machined wood parts complete lsardware package includes plug-in djustable stab parts new wing mounts Wing Span- 72 inWing Ara 860 sq Complete Delux KitSI 5995 TRANSMITTER CASE An inexpensive rugged molded case protect expensive transmitter both two stick single stick transmitters Black leather grain aluminum trim locking clasp SI 995 MV-I TYPHOON New F3A competition Big beautiful flyer balsa construction plug-in wings 120 four stroke 60 two stroke power Plans-two sheets S 1495 Fiberglass cowl Si 595 Clear butyrate canopy. 5 995 OTHER PLANS Tiger Tail 4S-two sheets 120 four strokesS 1495 TAR baby 120 four strokes51195 Alley Kat 40 size trainer sportS 895 Gator Flea 40 size sport5 895 Bobcat 40 size sportS 895 feather Ilte glass cloth 7 ozsq yd est weave Fastest Filling test Finished Weight Big 3 Sq Yard Pkg Oetailed Instructions- $895 Include $2 SOlItem UPS esidents Add 6% Sales Tax GATOR RIC PRODUCTS 3713 Pompano Dr acola FL 32514 4768639 Letters Editor Continued page 12 Ken opened hobby shop Burk & Company Department Store after World War II worked him full-time year until started college After worked part-time until completing college Milton H Fanning Nashville TN Safety/Preston Continued page 22 some MonoKote repairs moral tale wise keep small extinguisher field box As alter native may possible smother fire towel rag blanket Cub Yellow engine cowling first RC model powered Cox 09 began turn first orange brown able smother fire wrap ping rag around front model Have safe month Keytwo/Randoiph Continued page 30 der everything place range check equipmentand its time fly Flying has wide performance en velope compared Paskey Keytwo basically quite gentle flier Whether upright inverted stall shows abso lutely no tendency snap fact model balanced correctly its very diffi cult make snap snaps bag move center-of-gravity aft about /2 increase elevator throw rate /16 up down movement trailing edge aile rons about right comfortable flying Landings can made nose-high slow full aileron control way touch down problem knife-edge flight first airplane persistently climbed half-loop until learned nose stayed up just little rudder Once Id mastered technique knife-edge loops included Keytwos repertoire tricks what did Eddie Williams have say about latest re-creation see youve built another Paskey said unsung maestro drunken pilot routine Its about time Play again Eddie Radio Technique/Myers Continued page 34 Failsafe Flight System small 15 sq light less ounce inexpensive has very low operating current 70 mA works no doubt nine-volt transistor radio batteries expensive about $250 Duracells live will last long time some chance will get care less let run down some critical time unit meets its claims follow admonition use fresh batteries check servo speed during preflight inspection careless youll probably crash some other reason anyway Failsafe Flight System @ $3995 list T&D Flight Systems PO Box 1782 Staten Island NY 10314 additional information call Alex Kronfeld l-7t8/984-9121 Propeller Noise Continued page 42 cause poor community relations Much cure will depend upon education Modelers need understand nature problem order properly utilize solu tions article has introduced propel ler noise problem provided some neces sary background Subsequent articles will explain test results greater detail describe what modeler can achieve better aircraft performance less noise RC Soaring/Blakeslee Continued page 49 down hes hoping arrange factur ers demonstrations during meet would flying demos followed show-andtell sessions guys like Byron Bruce Combat Models Marty Silberstein Steve Peacock Cliff Hangar Models Brian Laird Paul Masura Slope Scale Models Other Id imagine itll much like fabulously suc cessful Richland Scale Slope Fun Flyie fly want long have pin Info available writing Charley SSN 2601 E 19th 51 #29 Signal Hill CA 90804 Better call him 1-213/494-3712 1990 Soaring contests Ray Hayes Vice Presi dent LSF wrote remind us now time plan next years big contests Spe cifically Ray talking about every-evenyear LSF Regionals annual NSS Soar-Ins put go-ahead clubs around coun try Theyre bit expensive Ray hoping Continue tradition awarding beautiful LSF plaques LSF Regionals Theyre worth winning Ray also hoping three super con tests NSS Masters LSF Nationals AMA Nats can spread around country 1990 contests West Coast 89 Ray afraid guys east Kansas beginning feel left out youd like info LSF Regionals check Ray 69598 Brookhill Dr Romeo MI 48065 phone 1-313/ 752-6163 NSS Soar-Ins have handled Marshall Long past few years assume youre 90 Marshall Marshalls address 824 Garden Meadow Universal City TX 78148 worry East Coasters hear Nats will Lawrenceville IL 90 RC Aerobatics/Van Putte Continued page 51 aerodynamic center segment wing Youll note root segment tip another segment Figure 4 shows geometric technique solu tion Remember aerodynamic center panel 25% point mean aerody namic chord panel Once youve determined aerodynamic cen ter panel must calculate area panel using Equation 2 measure distance convenient line aerody namic centers panels Figure 4 shows con venient reference line distance re spective aerodynamic centers distance back reference line aerodynamic center wing located determined Equation 3 mean aerodynamic chord complete wing calculated individual values shown Equation 4 looks just like equa tion determining distance wing aero dynamic center doesnt should since 156 Model Aviation
Edition: Model Aviation - 1989/12
Page Numbers: 32, 33, 34, 156
George M Mye Radio Thchnique 70 Froeblich Farm Rd Hicksville NY 1901 ABSTRACT Failsafe Flight System FFS SAFER RC FLYING may result use T&D Flight Systems Failsafe Flight System FFS product may find interesting unit Connects receiver place ofor parallel witha servo has several func tions 1 Emergency in-flight battery charger ckup flight battery 3 Sensitive voltmeter low-voltage alarm 4 Interference monitor 5 Lost airplane locator 6 Switch-position indicator admit being skeptical about entrusting airplane nine-volt transistor radio battery Alex asked about two years ago told him doubted idea would work So ran some tests did work got some other people fly unit worked too tested two models having list price $3995 FFS-l PWM Pulse-Width Modulation ordinary AM FM receivers FFS-2 PCM Pulse Code Modulation re ceivers share functions except FFS-l con tains pulse-omission detector Locator function FFS-2 uses timer instead difference brought about differences way PWM PCM receivers work Both FFS-I FFS-2 will work single- dualconversion receivers Lets examine func tions I Nicad Charger CHGboth models An onboard nine-volt transistor radio battery auto matically starts charging battery air plane whenever switch Ni-Cd pack terminal voltage drops below 47 VDC protects against dragging Ni-Cd pack down such low voltage cell damage possible actual charging current varies cause 9-VDC battery supplies current needed FFS units tested acted like very stiff 43-VDC voltage regulator once Ni-Cd pack dropped level 2 Backup Battery BUboth models fresh nine-volt transistor radio battery will operate airplane about 30 minutes event total failure Ni-Cd pack plugs become disconnected wires fail switches turn selves off cells fail etc 3 Low-VoIrge Alarm ESV/LVAboth mod els internal beeper sounds off whenever Ni-Cd battery voltage drops below 47 VDC sense could considered full-time ESV expanded-scale voltmeter because con tinually measures voltage receiver very pre cisely under actual load conditions alarm sounds before primary battery completely exhausted Model FFS-3 PCM available $2995 list has ESV LVA func tion relying low-voltage alarm some kind like automatic low throttle usually built PCM receivers receivers failsafe function can switched off PCM receiv ers isnt switched off failsafe s-i OFF ON ON ON ON ON ON ON d ON Locate/Inte Failsafe Fli Receiver s rransmitte Receiver vo Current Out Control function may set operate some voltage low 47 means could flying backup battery know Im enthu siastic about FFS-3 4 Interference Monitor TNT a Model FF5-I will switch air plane receiver before turning transmit ter beeper should sound steady tone dont hear beeper stutters have some kind problem may dead bat teries may somebody else already us ing channel may some kind inter ference hitting channel Whatever ye warned b Model FFS-2 cant tell about interfer ence because PCM receivers usually send servos failsafe position suffering inter ference PCM failsafe signal looks just like valid transmitter signal 5 Lost Airplane Locator LOC a Model FF5-I plane goes down tall corn switch transmitter off listen carefully may hear beeper calling b Model FFS-2 Eighteen minutes after unit switched beeper will sound havent found plane beeper may help find 6 Switch Position Indicator SPI a Model FFS-l turn trans mitter off beeper will sound immediately leave both transmitter receiver turned beeper will sound batteries run down LVA b Model FFS-2 hear beeper cry ing way home ie 18 minutes after turned receiver youve left something twitched again Both models provide wires connecting external noisemaker should have trouble hearing high-pitched beeper circuit board Note big lump beeper chosen after some smaller beepers failed flight due vibration encapsulated ep oxy resists vibration well big tin can functions resonator sound lens make sound seem louder order test FF5 cut aileron ex tender half assembled wires 32 Model Aviation Failsafe Flight System FF5-i its 9V Duracell power pack Georges aileron ex tender added see text Production units will come neat plastic case strain reliefs wires Unused wire pigtail connection external noisemaker supplied ones FFS unit joining three red wires three black wires three white wires set three wires insulated heat-shrink tub ing another piece big h/s tubing put over nest three junctions plugged extender receiver servo other end extender Three servos battery pack switch harness later ready go tested Model FFS-l World Engines Expert FM system Model FFS-2 Polks Chal lenger 550 PCM system both worked well matrix tests performed sum mary test results appear separate table units tried maintain voltage 433 Nicad Charger mode After running down charge Ni-Cds found stirred stick transmitter keep two ser yos moving continuously current drawn nine-volt battery jumped high 450 mA voltage receiver measured servo lead plugged receiver stayed 430 031-10 volts through stopped moving servos current subsided 65 mA shut off FFS let Ni-Cds drop 33 VDC under load idle flight pack As soon turned FFS back current went about 120 mA subsided 65 mA again once Ni-Cd pack charged back 433 VDC Alex says Duracells Energizers brands battery should use unitother brands sometimes satisfac tory according tests Remember way off manufacturers curve use nine-volt transistor radio battery way particular use lithium batteries have very long shelf lives cant supply large currents RC system will need time time voltage regulator circuit board will handle ampere complaining put 33-ohm/l0-watt resistor reasonably fresh nine-volt Energizer saw 15 amps 58 volts voltage dropped rapidly FUEL WIZZARD THE WORLDS FASTEST AND MOST CONVENIENT FUEL PUMP EVER * FITS ALL GALLON FUEL BOTTLES * FAST ONE STROKE LL OUNCE OF FUEL * ALL FUEL SAFE GLO FUEL & GASOLINE SUGGESTED RETAtL $995 NOW JUST $750 FILLS THE LARGEST MODEL FUEL TANKS IN SECONDS YOUR DEALER OR ORtER IIRECT PLEASE ENTER MY ORDER FORFUEL WIZZARDS AT $ 750 EACIt POSTAGE PAID NAMESTREET________________________ CITYSTATE________________ ZIP_________ ORDER FROM ACME PLASTIC PUMP CO P 0 BOX 24551 MINNEAPOLIS MN 55424 IEALER INQUIRIES INVITEI December 1989 33 George read about double crash occurred modelers use wrong frequency flag antenna re ported John Prestons Safety Comes First column June issue MA page 153 figured could happen him tool Solution put some stick-on RC channel num bers top front edge RC trans mitter owns Numbers came label sheets blank videotape cartridges lo cation harder overlook place manufacturer tags transmitter KIT J-1 F-16A Falcon WIngspan 15 41 E Lincoln Ave Hatfield PA 19440 215 361-8700 Available Favorite Hobby Shop Now! F-14A Tomcat SHOWN Wingspan 32 3295 four models TRUE SCALE reproductions popular Jet Fighters used US Allied Forces throughout world today Any models can built Display Catapault Launch Flying kit contains Diecut Balsa Parts Vac Formed Plastic Parts Decal rolled Plan Covering Tissue TAIBI 0 H36dTOIUsI 1iYi BALSA WOOD STICKS 1/16-INCH3648 1116111606 11163/3207 1/1601/60811 1/16r3/160913 1/1601/41015 1/16 3/61317 1/16 01/21620 1/16 3142128 3/32-INCH3646 3/323/320611 3/32s 1/60913 3/320 3/161015 3/321/41316 3/3203/61419 3/320 1/21621 3/320 3/42431 Double Balsa Wood Prices Spruce aod Bassorood Sbcks 1160 1/60611 1/603/161115 1/6o 1/41317 1/6 03/61621 1/6o 1/21724 1/603/42533 3/16-INCH3646 3/1603/161317 3/16o 1/41419 3/1603/61621 3/160 1/21625 3/16 0 3/42636 1/4-INCH3646 1/40141621 1/403/61825 1/4o1/22129 1/403/43142 5/16-INCH3646 511605/192027 5/1603/62230 5/1601/22736 5/16 0343652 3/6-INCH3646 3/60 3/62737 3/60 1/23041 3/60 3/44460 1/2-INCH3648 1/201/23746 1/203/45270 TRIANGULAR CUT BALSA 1/4o1/4o3624 3/6o3/6o3629 1/2 0 1/20 3637 314o3/4o3647 10103661 BALSA PLANKS 3/4o3o36176 102036164 103036230 104036303 2o2o36230 203036329 204036464 303036490 3o4o36660 BALSA SHEETS 1-INCH3646 1/160 12736 3/32 0 13640 1/6013344 3/160 13749 1/40 14157 3/6015372 1/20 16596 2-INCSI3646 1122023040 1/16e23646 3/32 e 24154 1/6024660 3/160 25472 1/4e26384 3/60 277103 11202113150 3-INCH3646 1/32034053 1/16034356 3/32 0 35270 1/6036060 3/160 37295 1/40364112 5/1603103134 3/603120160 1/203150200 4-INCH3646 1/32046567 1/160473101 3/32 0 462109 1/60495126 3/1604114181 1/404131193 3/604162271 1/204219325 BIRCH PLYWOOD 1/640120 12175 1/64012024350 l/64012o49700 1/64 046 0 492600 I/32o6o1252 1/320120 12105 1/32012024210 1/32 012046420 l/16o6o 1252 1/160120 12105 1/16 0120 24210 1/16 012049420 3/3206o1261 3/32012012163 3/32 012 024326 3/32 o12 o46652 1/60601269 1/60120 12179 1/6012024356 1/6 012046712 3/16o6o1274 3/160120 12146 3/160 12024293 3/160 12046565 1/40601274 1/40120 12146 1/4012024293 1/4012046565 3/6 0 12 0 12160 3/0 0 120 24360 3/6 0 12046720 1/20 120 12202 1/20 12024405 1/20 12046606 LITE PLYWOOD 1/6o12o1256 1/6 0 12 0 24112 1/6 0 120 46224 TAPERED TRAILING EDGE3646 1/60 1/22230 3/160 3/42940 1/40 14255 5/160 lVo4461 3/60 15272 Superior Aircraft Materials 12020-G Centralia iian Gardens California 90716 865-3220 Handling Charge -$500 $300 COD mum Order $2000 FOB Factory accept Personal checks COD fornia Residents add 6/% Sales Tax dont think want treat nine-volt transIs tor radio batteries way Drawing 450 mA normal tough enough margin regulator case somebody decides plug rechargeable things place nine-volt transistor battery can give current have less capacity will run down faster alkaline battery Im sat isfied fresh nine-volt Duracell will run ordinary radio four normal 450-mA stall current servos reasonable time According Duracell Inc data MN1604 battery sent Alex Kronfeld battery will discharge 90 48 volts working 5 10-ohm load produce av erage current 14 mA 40 hours Duracell quotes capacity 552 mAh Ill bet never expected find much power tiny package know didnt test data indicates fresh battery will run FFS about 40 hours Lost Airplane Locator mode didnt run high-current discharge test own see what capacity would under average drain something like 100 mA tak ing consideration another Alexs claim 30 minutes emergency operating time fresh battery seems adequately conservative backs endorsements eight local fliers have participated tests fresh fresh batteries can check terminal voltage beeper howling make estimate remaining ca pacity Deduct 130 mAh per volt readings low 90 So see 80 volts can esti mate 514-130 mAh remaining normal 10-minute flight after ground check interfer ence couple minutes pits will prob ably take away 30 mAh So never use Backup Battery Lost Airplane Locator func tion battery might good 170 flights two seasons flying people course youll have deduct few flights account loss capacity over time self discharge also known shelf life other hand want leave least five minutes panicky Backup Battery time pack d better throw battery away gets down 72 volts discharge curve resembles Ni-Cd battery last 30% capac ity goes away fast will begin preflight testing turning backup battery will notice servos have slowed down bit nine-volt battery voltage drops seven-volt level convenient way know change backup battery Just remember turn primary battery before fly units tested set up support fourcell Ni-Cd packs event run ning five cells Alex will build unit voltage cutoffs set situation Likewise running 200-mAh packs feed servos draw usual 450-mA stall current Alex will put bigger regulator sec ond case will have use larger nine-volt battery supply current need line thinking BFS-l Boat Failsafe planned also $3995 list will have two-amp voltage regulator jumper use four five Ni-Cd cells no locat function will usable either PWM PCM systems Continued page 156 Last Call Module 7SP ATRCS retro-fit program will end Lecember 31 1989 sure get conversion soon Stores four aircraft setups Includes seven different servo configurations Individual surface travel limits centering Single switch presets launch speed modes Full trailing edge control Enhanced mixing functions Crow landing capability User selectable cross trim capability ATRCSTM Advaaced Technoloej Radio Control Syatem Converts Module 7SP advanced computerized control system Flap Stick reversing Elevator camber VTR Automatic selection high ail rudder mixing launch landing modes Control Systems Laboratories 238 S Hillview Dr Milpitas CA 95035 408 946-4142 AirtronilM Module 7SP registered 34 Model Aviation GATOR RIC PRODUCTS DELUX ALL BALSA KIT An new Tiger Tail 120 four strokes piped 60 two strokes beautiful performer competition just showing offI balsa kit machined wood parts complete lsardware package includes plug-in djustable stab parts new wing mounts Wing Span- 72 inWing Ara 860 sq Complete Delux KitSI 5995 TRANSMITTER CASE An inexpensive rugged molded case protect expensive transmitter both two stick single stick transmitters Black leather grain aluminum trim locking clasp SI 995 MV-I TYPHOON New F3A competition Big beautiful flyer balsa construction plug-in wings 120 four stroke 60 two stroke power Plans-two sheets S 1495 Fiberglass cowl Si 595 Clear butyrate canopy. 5 995 OTHER PLANS Tiger Tail 4S-two sheets 120 four strokesS 1495 TAR baby 120 four strokes51195 Alley Kat 40 size trainer sportS 895 Gator Flea 40 size sport5 895 Bobcat 40 size sportS 895 feather Ilte glass cloth 7 ozsq yd est weave Fastest Filling test Finished Weight Big 3 Sq Yard Pkg Oetailed Instructions- $895 Include $2 SOlItem UPS esidents Add 6% Sales Tax GATOR RIC PRODUCTS 3713 Pompano Dr acola FL 32514 4768639 Letters Editor Continued page 12 Ken opened hobby shop Burk & Company Department Store after World War II worked him full-time year until started college After worked part-time until completing college Milton H Fanning Nashville TN Safety/Preston Continued page 22 some MonoKote repairs moral tale wise keep small extinguisher field box As alter native may possible smother fire towel rag blanket Cub Yellow engine cowling first RC model powered Cox 09 began turn first orange brown able smother fire wrap ping rag around front model Have safe month Keytwo/Randoiph Continued page 30 der everything place range check equipmentand its time fly Flying has wide performance en velope compared Paskey Keytwo basically quite gentle flier Whether upright inverted stall shows abso lutely no tendency snap fact model balanced correctly its very diffi cult make snap snaps bag move center-of-gravity aft about /2 increase elevator throw rate /16 up down movement trailing edge aile rons about right comfortable flying Landings can made nose-high slow full aileron control way touch down problem knife-edge flight first airplane persistently climbed half-loop until learned nose stayed up just little rudder Once Id mastered technique knife-edge loops included Keytwos repertoire tricks what did Eddie Williams have say about latest re-creation see youve built another Paskey said unsung maestro drunken pilot routine Its about time Play again Eddie Radio Technique/Myers Continued page 34 Failsafe Flight System small 15 sq light less ounce inexpensive has very low operating current 70 mA works no doubt nine-volt transistor radio batteries expensive about $250 Duracells live will last long time some chance will get care less let run down some critical time unit meets its claims follow admonition use fresh batteries check servo speed during preflight inspection careless youll probably crash some other reason anyway Failsafe Flight System @ $3995 list T&D Flight Systems PO Box 1782 Staten Island NY 10314 additional information call Alex Kronfeld l-7t8/984-9121 Propeller Noise Continued page 42 cause poor community relations Much cure will depend upon education Modelers need understand nature problem order properly utilize solu tions article has introduced propel ler noise problem provided some neces sary background Subsequent articles will explain test results greater detail describe what modeler can achieve better aircraft performance less noise RC Soaring/Blakeslee Continued page 49 down hes hoping arrange factur ers demonstrations during meet would flying demos followed show-andtell sessions guys like Byron Bruce Combat Models Marty Silberstein Steve Peacock Cliff Hangar Models Brian Laird Paul Masura Slope Scale Models Other Id imagine itll much like fabulously suc cessful Richland Scale Slope Fun Flyie fly want long have pin Info available writing Charley SSN 2601 E 19th 51 #29 Signal Hill CA 90804 Better call him 1-213/494-3712 1990 Soaring contests Ray Hayes Vice Presi dent LSF wrote remind us now time plan next years big contests Spe cifically Ray talking about every-evenyear LSF Regionals annual NSS Soar-Ins put go-ahead clubs around coun try Theyre bit expensive Ray hoping Continue tradition awarding beautiful LSF plaques LSF Regionals Theyre worth winning Ray also hoping three super con tests NSS Masters LSF Nationals AMA Nats can spread around country 1990 contests West Coast 89 Ray afraid guys east Kansas beginning feel left out youd like info LSF Regionals check Ray 69598 Brookhill Dr Romeo MI 48065 phone 1-313/ 752-6163 NSS Soar-Ins have handled Marshall Long past few years assume youre 90 Marshall Marshalls address 824 Garden Meadow Universal City TX 78148 worry East Coasters hear Nats will Lawrenceville IL 90 RC Aerobatics/Van Putte Continued page 51 aerodynamic center segment wing Youll note root segment tip another segment Figure 4 shows geometric technique solu tion Remember aerodynamic center panel 25% point mean aerody namic chord panel Once youve determined aerodynamic cen ter panel must calculate area panel using Equation 2 measure distance convenient line aerody namic centers panels Figure 4 shows con venient reference line distance re spective aerodynamic centers distance back reference line aerodynamic center wing located determined Equation 3 mean aerodynamic chord complete wing calculated individual values shown Equation 4 looks just like equa tion determining distance wing aero dynamic center doesnt should since 156 Model Aviation