Soaring HOW MANY OF US through course model flying have occasion help new flier group first flight probably have own talking through techniques neophyte procedures no doubt have successful Yet new fliers really learned anything first flights has scribes observation normal talk through conversations range little right"push nose over"a little up Harvey think better run cover have left new flier necessarily same confidence takes run sailplane slalom course through string telephone poles next few minutes can forget about aerodynamics principles flight basic laws physics simple point will em phasized have found work success fully getting model new flier off tow safely ground Nothing wrong having knowledge background above studies except new fliers sciences usually useful ana lyzing wreckage making successful first flight new flier simple point know recognize what sailplanes fuselage pro fileand angle respect horizon flight can readily determined observing particular trimmed out sailplane during some hand-launched tests experienced flier testing new ship Hobie-Hawk example has very low nose profile normal gliding attitudesomewhat deceiving realizes efficient sailplane Other models profiles vary compared horizon fuselage angles pronounced nose-low appearance about parallel horizon no case have seen presently kitted models would have normal flight profile noseabove-the-horizon attitude present discussion concerning fuselage angle let us restrict flying talk off towto safely ground aspect flyingomitting best L/D concepts fly distance spot landing techniques transparent yellow Monokote easier see orange against blue sky sake using round numbers let us assume flier have sailplane glides 10 mph Now day air absolutely calm test glide plane flies 10 mph over ground its airspeed also 10 mph day wind say 7 mph test glide wind same sailplane appears fly much slower Over ground slowerthe groundspeed 3 mph airspeed still 10 mph able compare two distances model covered calm air vs 7-mph wind would note distance over ground much less 7-mph wind suming release height same both cases calm air see Fig 1 During both tests same fuselage angle should have maintained Now again test glide same plane same height same 0OJIRDPER9YItEO DrSTANCE OVER IRE GROUND FIG 1 lMPEIAILAIN00RD DISTANCE OVER ORE OROOND FIG 2 fuselage angle same 7-mph wind now back tailwind greater distance would covered over ground see Fig 2 airspeed would still 10 mph ground speed would now 17 mph Now moment let us refer fuselage angle something else Technically speaking wing changing its angle respect relative wind angle attack chang ing see Fig 3 since wings attached fuselages angular changes fuselages easier see distance will continue refer fuse lage angle time respect angle attack As angle attack increases does drag drag increases airspeed decreases angle attack can increased point air separates wing wing can no longer produce enough lift see Fig 4 critical angle reached wing stalls whatever attached tends fall out sky Now let us present some examples 1 Let us say model stalls 6 mph glide test air calm slow ly increased angle attackfuselage angleyou would see plane slowly decrease its airspeed drop stall its nor mal glide path would however still mov ing 4 mph over ground time stall 2 test flew 7-mph wind plane approached stall would slow point would motionless over groundairspeed would still 7 mph move backwards until stalled again 6 mph minus 1 mph groundspeed 3 Now let us suppose test same plane again 7-mph tailwind As glides now 17 mph over ground increase angle attack what appears safe fly ing speed13 mphthe plane drops out sky Right groundspeed 13 mph airspeed again 6 mph seasoned flyer old hat novice latest condition just mentioned mis understood least recognized plane crunch er sport tests~ apply regular flight new hobby remember no matter fast slow sailplane appears flying try keep fuselage angle respect horizon angle relative horizon know safe continued page 76 January 1976 21 FIG 3 fiw FIG 4 1 ELECTRIC FLIGHT SYSTEM Featuring HYTORK 48 MOTOR & PLANETARY GEAR UNIT Complete tlying weight 2/2 oz-will power Models 25 50 wingspan weighing up 10 oz Send 25 Catalog showing com plete line Electric Flight Equipment Accessories VL-1O1 System $1950 Hytork 48 Prop Instruction Book $900 Fast Chargers $1450 $2950 See Model Dealer order Direct add 10% Postage Handling Calif Residents also add 6% Sales Tax send Check MO No CODs Hobby Dealers send Information permitted unlisted operation will receive consideration during Scale judging Change 449 Bonus Points read follows bonus score will awarded scale-like flight 10 laps follows aTake-off0 25 points bFlight Glide0 25 points c Approach Landing. points dEngine starting bonus10 points bonus 10 points shall awarded model becomes airborne within minute starting time Time starts contestant mechanic begins cranking engine multi-engine models minute additional time shall allowed additional engine pro vided engines operating during take-off No automatic maximum scores will awarded Scale Operations paragraph 7 Bonus Points b c paragraph 9 will judged relation scalelike qualities points awarded accordingly Airborne laps points paragraph 8 engine starting bonus d paragraph 9 automatic maximum scores hope above rules will help out great selection good scale model address 118 East Wheeler St North Mankato Mion 56001 P0 BOX 2498 -AMALA MESA CALIF 92041 PHONE 17I4I 4698675 PRODUCTS SION OF VISTA LABS % 7023-D Canoga Ave Canoga Park Ca 91303 CL Scale/Stott continued page 33 f Revolve move turrets 4 cycles 20 points g Other mechaniesi options listed each0 20 points Points non-listed items shall based upon rela tive skill ingenuity effect compared listed items c d e f maximum 30 points may awarded 3 non-listed items h Inside Loop0 20 points iInverted laps 30 20 points jWing over0 20 points k Figure 80 20 points ITouch go0 20 points Model shall land normally take off again coming stop Quality landing take-off will judged Taxi0 20 points Model must land engines running come complete stop taxi complete lap flying circle come dead stop point taxi started Ten addi tional points will awarded operation engine cut-off demonstrated Note Items h i j k m will per formed after ten level laps have flown Flight Glide points Bonus Points para graph will forfeited Lighting systems will iLEfW IMOLDEO& DUCR MOLDED CANOPY Iu--/ ICANOPY__ ZEROKP 5 MUSTANG N PANPNUS NUliE 0/ OD pbo 5 WOE Os RECORD J INESMTH COUGER I3 N SPAN P NUT ANDREASON BA4-B FIS IN SPAN PNUTKITS $349 EACH PeckPeIymers RC Soaring/Pruss continued page 21 particular model-that nose low parallel horizon especially true making turn wind upwind downwind Remember example 2 groundspeed relatively slow OK As make turn go downwind coming condition similar example 3 Suddenly groundspeed increases normal usually new flier instinctively pulls nose up slow down trying fly model speed accustomed seeing flying wind stall likely occur close ground might too late effect recovery has said tends make kit manufacturers smile fuselage angle maintained through out turn would normal see sail plane increase its groundspeed proceeded downwind takes bit discipline realizing what safe angle attitude de velops confidence necessary assuring first successful flights Now began turn back wind groundspeed would diminish would appear sailplane has slowed down fuselage angle still maintained throughout turn slow ing down plane would expected knowing fuselage angle complete confi dence could maintained should also realized winds necessarily steady velocity direction gusts wind shifts occur can upset model its intended flight attitude happens flier might suddenly find model attitude sure didnt put Again fuselage angle flier must command model concerned about fuselage angle know will give safe performance Sometime during course flying will probably hear perils downwind turn never did know should hair ier upwind perilous because flierwhile flying plane down windtries slow model down fuselage angle before commences turn poor procedure time model has slowed down what thinks safe speed model stalls example 3 too close ground its back drawing board Again foregoing directed seasoned flier instinctively reacts other normal conditions new flier Neither does guarantee 10-minute maxes landing model ones feet intended help new flier get through some earlier growing pains develop confidence quickly sport relaxing what about Getting novice flier recognize sail planes flight performance emphasizing fuse lage angle has further proven suc cessful method teaching getting new modeler solo successfully An Observation Two RC Soaring can label sport successful regards contest program perhaps should further realize date has successful First newcomers less years experience have seen en joying contest circuit past summer Most fliers have experienced perfect 10minute max have also made respectable spot 76 Model Aviation RUBBER POWERED FLYING MODELS KITS S SSORIES OTHER PEANUT SCALE KITS PIESETIIPOL AIR CAMPER S MIt ORUINE TURBULENT R J3 CUR KITS $329 EACH SrRITJOLESS WONDER KIT $249 P KITS ARE NOT AVAILAELE AT TOSE DEALER ORDER DIRECT ADD 35 FOR POSTAGE P10W COMPLETE SELECTION OP OVER RU PLANS AND DRAWINGS PROM W C HANNAN GRAPHICS ALSOHUNGERPORD WHEELS TIC PROPS LEE WWI PNDT SITS NYLON BEARINGS NEW 75 CATALOG 25K HARD TO PIND ACCESSORIES KITS AND PLANS POE RUBBER POWERED MODELS landings Two-minute precision flights have made creditable 15 cumulative scores reached novice can reach achievements week-end flier gives him confidence tending first contest flier realizes has get together contest knowing able before has stimulate individuals giving go against local state national champion Secondly flexibility particular tasks ie duration 6-10 minutes precision 2-3 min utes landing zonesspeed/distance has allowed contest managers select tasks best suited own conditions same flexi bility has further kept contests becoming routine opinion current flavor tasksspeed/distance duration precision flying can maintained existing accepted flexibility would best interests sport past contest season attests way thinking Witness LSF Tournament its speed/distance task designed Donelson/ Hahn Michigan State Championships 24-minute cumulative3 round task no flight over 10 minutes penalized feature CD Gordon Pearson claimed widely accepted point modifications tasks introduced presented because serve new need purpose Although variations theme often have also refinements CDs contest planners have taken few liberties rule book same people have added new dimensions competition modifica tions have seldom caused unpleasant air above have encouraged discouraged newcomer climb ring LSFShortlines Membership October past 1600 west country join Czech oslovakia w soaring oking added challenge in LSF Send letter intent form League Silent Flight Dept M PO Box 39068 Chicago IL 60639 Include stamped self-addressed envelope address Rt 2 Box 490 Plainfield Ill 60544 3 Work concentration After fivemile run try flying AMA Stunt Pattern best Combat ship Develop ability block out pain exhaustion think about making correct decision Fly enough practice going both upright inverted overcome tendency become dizzy beginner intermediate goes route will find progress somewhat slower tedious just built bunch planes went out bash everybody end will acquire far greater level proficiency Professionals practice first compete Combat events low cost fun event can found class Rules vary through out country basically use 049 en gines 25- 40-foot lines California fly rule hut nobody knows what little devils require lot patience times suggested ulcer-prone author has 049s sale very sophisticated event found FA Combat flown international level US flown like 15-size AMA Combat will change World Cham pionships including Combat held scramble place US Team gets underway third class proclaimed decree Sunday flier special Slow Combat generally easiest place start beginner often left Junior Senior age contestants Slow Com bat will soon become new battle ground model designer because its place better plane advantage spectacular splatter Fast Combat high power high appeal event because last AMA events really no restrictions Once engine airplane hackers delight event has lost some its appeal because high horsepower ultra-trick airplanes became synonymous big-hole-in-ground falling pieces de cide design own plane sure give trick name can name after yourself win Nationals getting body mind airplanes shape can decide classes com pete also involved youll become local regional meets year throughout country well Nationals really flying might consider attending international meet like British National Championships Dutch International Spaarndam have great regional differences US noth ing like Europe attending international meeting youll rewarded experiences will give whole new perspective model flying 1974 Europeans got look American horsepower took K&B 40-powered Nemesis over some exhibition flights Yanks got first hand look I-l MOVINGLET US KNOW COMPLETETHISWhen WHERE YOU ARE GOINGI move please let us know advancesix weeks re CARD AND ATTACHquired change address Attach current MA mailing label I MAILING LABEL space cheek appropriate box below mail FROMA RECENTSubscription Dept Model Aviation 806 Fifteenth St. NW IISSUEWashington DC 20005I ICheck appropriate boxenclose paymentI 0 CHANGE OF ADDRESS0 NEW SUBSCRIPTION Non-AMA subscription rates $1200 12 months Canada United States posses sions elsewhere $1400 Membership AMA includes subscription see separate applica-I tion issueI NAMEI ADDRESSI CITY/STATE71 P___________________ LMODEL AVIATION 806 FIFTEENTH ST. NW. WASHINGTON DC 20005 January 1976 77 CL Combat/Johnson continued page 33 WANTED ideas happenings hints/kinks howto sketches photos news etc Send colum nist category concernedat address shown column photo idea printed Model Aviation will pay $5 contributor
Edition: Model Aviation - 1976/01
Page Numbers: 21, 76, 77
Soaring HOW MANY OF US through course model flying have occasion help new flier group first flight probably have own talking through techniques neophyte procedures no doubt have successful Yet new fliers really learned anything first flights has scribes observation normal talk through conversations range little right"push nose over"a little up Harvey think better run cover have left new flier necessarily same confidence takes run sailplane slalom course through string telephone poles next few minutes can forget about aerodynamics principles flight basic laws physics simple point will em phasized have found work success fully getting model new flier off tow safely ground Nothing wrong having knowledge background above studies except new fliers sciences usually useful ana lyzing wreckage making successful first flight new flier simple point know recognize what sailplanes fuselage pro fileand angle respect horizon flight can readily determined observing particular trimmed out sailplane during some hand-launched tests experienced flier testing new ship Hobie-Hawk example has very low nose profile normal gliding attitudesomewhat deceiving realizes efficient sailplane Other models profiles vary compared horizon fuselage angles pronounced nose-low appearance about parallel horizon no case have seen presently kitted models would have normal flight profile noseabove-the-horizon attitude present discussion concerning fuselage angle let us restrict flying talk off towto safely ground aspect flyingomitting best L/D concepts fly distance spot landing techniques transparent yellow Monokote easier see orange against blue sky sake using round numbers let us assume flier have sailplane glides 10 mph Now day air absolutely calm test glide plane flies 10 mph over ground its airspeed also 10 mph day wind say 7 mph test glide wind same sailplane appears fly much slower Over ground slowerthe groundspeed 3 mph airspeed still 10 mph able compare two distances model covered calm air vs 7-mph wind would note distance over ground much less 7-mph wind suming release height same both cases calm air see Fig 1 During both tests same fuselage angle should have maintained Now again test glide same plane same height same 0OJIRDPER9YItEO DrSTANCE OVER IRE GROUND FIG 1 lMPEIAILAIN00RD DISTANCE OVER ORE OROOND FIG 2 fuselage angle same 7-mph wind now back tailwind greater distance would covered over ground see Fig 2 airspeed would still 10 mph ground speed would now 17 mph Now moment let us refer fuselage angle something else Technically speaking wing changing its angle respect relative wind angle attack chang ing see Fig 3 since wings attached fuselages angular changes fuselages easier see distance will continue refer fuse lage angle time respect angle attack As angle attack increases does drag drag increases airspeed decreases angle attack can increased point air separates wing wing can no longer produce enough lift see Fig 4 critical angle reached wing stalls whatever attached tends fall out sky Now let us present some examples 1 Let us say model stalls 6 mph glide test air calm slow ly increased angle attackfuselage angleyou would see plane slowly decrease its airspeed drop stall its nor mal glide path would however still mov ing 4 mph over ground time stall 2 test flew 7-mph wind plane approached stall would slow point would motionless over groundairspeed would still 7 mph move backwards until stalled again 6 mph minus 1 mph groundspeed 3 Now let us suppose test same plane again 7-mph tailwind As glides now 17 mph over ground increase angle attack what appears safe fly ing speed13 mphthe plane drops out sky Right groundspeed 13 mph airspeed again 6 mph seasoned flyer old hat novice latest condition just mentioned mis understood least recognized plane crunch er sport tests~ apply regular flight new hobby remember no matter fast slow sailplane appears flying try keep fuselage angle respect horizon angle relative horizon know safe continued page 76 January 1976 21 FIG 3 fiw FIG 4 1 ELECTRIC FLIGHT SYSTEM Featuring HYTORK 48 MOTOR & PLANETARY GEAR UNIT Complete tlying weight 2/2 oz-will power Models 25 50 wingspan weighing up 10 oz Send 25 Catalog showing com plete line Electric Flight Equipment Accessories VL-1O1 System $1950 Hytork 48 Prop Instruction Book $900 Fast Chargers $1450 $2950 See Model Dealer order Direct add 10% Postage Handling Calif Residents also add 6% Sales Tax send Check MO No CODs Hobby Dealers send Information permitted unlisted operation will receive consideration during Scale judging Change 449 Bonus Points read follows bonus score will awarded scale-like flight 10 laps follows aTake-off0 25 points bFlight Glide0 25 points c Approach Landing. points dEngine starting bonus10 points bonus 10 points shall awarded model becomes airborne within minute starting time Time starts contestant mechanic begins cranking engine multi-engine models minute additional time shall allowed additional engine pro vided engines operating during take-off No automatic maximum scores will awarded Scale Operations paragraph 7 Bonus Points b c paragraph 9 will judged relation scalelike qualities points awarded accordingly Airborne laps points paragraph 8 engine starting bonus d paragraph 9 automatic maximum scores hope above rules will help out great selection good scale model address 118 East Wheeler St North Mankato Mion 56001 P0 BOX 2498 -AMALA MESA CALIF 92041 PHONE 17I4I 4698675 PRODUCTS SION OF VISTA LABS % 7023-D Canoga Ave Canoga Park Ca 91303 CL Scale/Stott continued page 33 f Revolve move turrets 4 cycles 20 points g Other mechaniesi options listed each0 20 points Points non-listed items shall based upon rela tive skill ingenuity effect compared listed items c d e f maximum 30 points may awarded 3 non-listed items h Inside Loop0 20 points iInverted laps 30 20 points jWing over0 20 points k Figure 80 20 points ITouch go0 20 points Model shall land normally take off again coming stop Quality landing take-off will judged Taxi0 20 points Model must land engines running come complete stop taxi complete lap flying circle come dead stop point taxi started Ten addi tional points will awarded operation engine cut-off demonstrated Note Items h i j k m will per formed after ten level laps have flown Flight Glide points Bonus Points para graph will forfeited Lighting systems will iLEfW IMOLDEO& DUCR MOLDED CANOPY Iu--/ ICANOPY__ ZEROKP 5 MUSTANG N PANPNUS NUliE 0/ OD pbo 5 WOE Os RECORD J INESMTH COUGER I3 N SPAN P NUT ANDREASON BA4-B FIS IN SPAN PNUTKITS $349 EACH PeckPeIymers RC Soaring/Pruss continued page 21 particular model-that nose low parallel horizon especially true making turn wind upwind downwind Remember example 2 groundspeed relatively slow OK As make turn go downwind coming condition similar example 3 Suddenly groundspeed increases normal usually new flier instinctively pulls nose up slow down trying fly model speed accustomed seeing flying wind stall likely occur close ground might too late effect recovery has said tends make kit manufacturers smile fuselage angle maintained through out turn would normal see sail plane increase its groundspeed proceeded downwind takes bit discipline realizing what safe angle attitude de velops confidence necessary assuring first successful flights Now began turn back wind groundspeed would diminish would appear sailplane has slowed down fuselage angle still maintained throughout turn slow ing down plane would expected knowing fuselage angle complete confi dence could maintained should also realized winds necessarily steady velocity direction gusts wind shifts occur can upset model its intended flight attitude happens flier might suddenly find model attitude sure didnt put Again fuselage angle flier must command model concerned about fuselage angle know will give safe performance Sometime during course flying will probably hear perils downwind turn never did know should hair ier upwind perilous because flierwhile flying plane down windtries slow model down fuselage angle before commences turn poor procedure time model has slowed down what thinks safe speed model stalls example 3 too close ground its back drawing board Again foregoing directed seasoned flier instinctively reacts other normal conditions new flier Neither does guarantee 10-minute maxes landing model ones feet intended help new flier get through some earlier growing pains develop confidence quickly sport relaxing what about Getting novice flier recognize sail planes flight performance emphasizing fuse lage angle has further proven suc cessful method teaching getting new modeler solo successfully An Observation Two RC Soaring can label sport successful regards contest program perhaps should further realize date has successful First newcomers less years experience have seen en joying contest circuit past summer Most fliers have experienced perfect 10minute max have also made respectable spot 76 Model Aviation RUBBER POWERED FLYING MODELS KITS S SSORIES OTHER PEANUT SCALE KITS PIESETIIPOL AIR CAMPER S MIt ORUINE TURBULENT R J3 CUR KITS $329 EACH SrRITJOLESS WONDER KIT $249 P KITS ARE NOT AVAILAELE AT TOSE DEALER ORDER DIRECT ADD 35 FOR POSTAGE P10W COMPLETE SELECTION OP OVER RU PLANS AND DRAWINGS PROM W C HANNAN GRAPHICS ALSOHUNGERPORD WHEELS TIC PROPS LEE WWI PNDT SITS NYLON BEARINGS NEW 75 CATALOG 25K HARD TO PIND ACCESSORIES KITS AND PLANS POE RUBBER POWERED MODELS landings Two-minute precision flights have made creditable 15 cumulative scores reached novice can reach achievements week-end flier gives him confidence tending first contest flier realizes has get together contest knowing able before has stimulate individuals giving go against local state national champion Secondly flexibility particular tasks ie duration 6-10 minutes precision 2-3 min utes landing zonesspeed/distance has allowed contest managers select tasks best suited own conditions same flexi bility has further kept contests becoming routine opinion current flavor tasksspeed/distance duration precision flying can maintained existing accepted flexibility would best interests sport past contest season attests way thinking Witness LSF Tournament its speed/distance task designed Donelson/ Hahn Michigan State Championships 24-minute cumulative3 round task no flight over 10 minutes penalized feature CD Gordon Pearson claimed widely accepted point modifications tasks introduced presented because serve new need purpose Although variations theme often have also refinements CDs contest planners have taken few liberties rule book same people have added new dimensions competition modifica tions have seldom caused unpleasant air above have encouraged discouraged newcomer climb ring LSFShortlines Membership October past 1600 west country join Czech oslovakia w soaring oking added challenge in LSF Send letter intent form League Silent Flight Dept M PO Box 39068 Chicago IL 60639 Include stamped self-addressed envelope address Rt 2 Box 490 Plainfield Ill 60544 3 Work concentration After fivemile run try flying AMA Stunt Pattern best Combat ship Develop ability block out pain exhaustion think about making correct decision Fly enough practice going both upright inverted overcome tendency become dizzy beginner intermediate goes route will find progress somewhat slower tedious just built bunch planes went out bash everybody end will acquire far greater level proficiency Professionals practice first compete Combat events low cost fun event can found class Rules vary through out country basically use 049 en gines 25- 40-foot lines California fly rule hut nobody knows what little devils require lot patience times suggested ulcer-prone author has 049s sale very sophisticated event found FA Combat flown international level US flown like 15-size AMA Combat will change World Cham pionships including Combat held scramble place US Team gets underway third class proclaimed decree Sunday flier special Slow Combat generally easiest place start beginner often left Junior Senior age contestants Slow Com bat will soon become new battle ground model designer because its place better plane advantage spectacular splatter Fast Combat high power high appeal event because last AMA events really no restrictions Once engine airplane hackers delight event has lost some its appeal because high horsepower ultra-trick airplanes became synonymous big-hole-in-ground falling pieces de cide design own plane sure give trick name can name after yourself win Nationals getting body mind airplanes shape can decide classes com pete also involved youll become local regional meets year throughout country well Nationals really flying might consider attending international meet like British National Championships Dutch International Spaarndam have great regional differences US noth ing like Europe attending international meeting youll rewarded experiences will give whole new perspective model flying 1974 Europeans got look American horsepower took K&B 40-powered Nemesis over some exhibition flights Yanks got first hand look I-l MOVINGLET US KNOW COMPLETETHISWhen WHERE YOU ARE GOINGI move please let us know advancesix weeks re CARD AND ATTACHquired change address Attach current MA mailing label I MAILING LABEL space cheek appropriate box below mail FROMA RECENTSubscription Dept Model Aviation 806 Fifteenth St. NW IISSUEWashington DC 20005I ICheck appropriate boxenclose paymentI 0 CHANGE OF ADDRESS0 NEW SUBSCRIPTION Non-AMA subscription rates $1200 12 months Canada United States posses sions elsewhere $1400 Membership AMA includes subscription see separate applica-I tion issueI NAMEI ADDRESSI CITY/STATE71 P___________________ LMODEL AVIATION 806 FIFTEENTH ST. NW. WASHINGTON DC 20005 January 1976 77 CL Combat/Johnson continued page 33 WANTED ideas happenings hints/kinks howto sketches photos news etc Send colum nist category concernedat address shown column photo idea printed Model Aviation will pay $5 contributor
Edition: Model Aviation - 1976/01
Page Numbers: 21, 76, 77
Soaring HOW MANY OF US through course model flying have occasion help new flier group first flight probably have own talking through techniques neophyte procedures no doubt have successful Yet new fliers really learned anything first flights has scribes observation normal talk through conversations range little right"push nose over"a little up Harvey think better run cover have left new flier necessarily same confidence takes run sailplane slalom course through string telephone poles next few minutes can forget about aerodynamics principles flight basic laws physics simple point will em phasized have found work success fully getting model new flier off tow safely ground Nothing wrong having knowledge background above studies except new fliers sciences usually useful ana lyzing wreckage making successful first flight new flier simple point know recognize what sailplanes fuselage pro fileand angle respect horizon flight can readily determined observing particular trimmed out sailplane during some hand-launched tests experienced flier testing new ship Hobie-Hawk example has very low nose profile normal gliding attitudesomewhat deceiving realizes efficient sailplane Other models profiles vary compared horizon fuselage angles pronounced nose-low appearance about parallel horizon no case have seen presently kitted models would have normal flight profile noseabove-the-horizon attitude present discussion concerning fuselage angle let us restrict flying talk off towto safely ground aspect flyingomitting best L/D concepts fly distance spot landing techniques transparent yellow Monokote easier see orange against blue sky sake using round numbers let us assume flier have sailplane glides 10 mph Now day air absolutely calm test glide plane flies 10 mph over ground its airspeed also 10 mph day wind say 7 mph test glide wind same sailplane appears fly much slower Over ground slowerthe groundspeed 3 mph airspeed still 10 mph able compare two distances model covered calm air vs 7-mph wind would note distance over ground much less 7-mph wind suming release height same both cases calm air see Fig 1 During both tests same fuselage angle should have maintained Now again test glide same plane same height same 0OJIRDPER9YItEO DrSTANCE OVER IRE GROUND FIG 1 lMPEIAILAIN00RD DISTANCE OVER ORE OROOND FIG 2 fuselage angle same 7-mph wind now back tailwind greater distance would covered over ground see Fig 2 airspeed would still 10 mph ground speed would now 17 mph Now moment let us refer fuselage angle something else Technically speaking wing changing its angle respect relative wind angle attack chang ing see Fig 3 since wings attached fuselages angular changes fuselages easier see distance will continue refer fuse lage angle time respect angle attack As angle attack increases does drag drag increases airspeed decreases angle attack can increased point air separates wing wing can no longer produce enough lift see Fig 4 critical angle reached wing stalls whatever attached tends fall out sky Now let us present some examples 1 Let us say model stalls 6 mph glide test air calm slow ly increased angle attackfuselage angleyou would see plane slowly decrease its airspeed drop stall its nor mal glide path would however still mov ing 4 mph over ground time stall 2 test flew 7-mph wind plane approached stall would slow point would motionless over groundairspeed would still 7 mph move backwards until stalled again 6 mph minus 1 mph groundspeed 3 Now let us suppose test same plane again 7-mph tailwind As glides now 17 mph over ground increase angle attack what appears safe fly ing speed13 mphthe plane drops out sky Right groundspeed 13 mph airspeed again 6 mph seasoned flyer old hat novice latest condition just mentioned mis understood least recognized plane crunch er sport tests~ apply regular flight new hobby remember no matter fast slow sailplane appears flying try keep fuselage angle respect horizon angle relative horizon know safe continued page 76 January 1976 21 FIG 3 fiw FIG 4 1 ELECTRIC FLIGHT SYSTEM Featuring HYTORK 48 MOTOR & PLANETARY GEAR UNIT Complete tlying weight 2/2 oz-will power Models 25 50 wingspan weighing up 10 oz Send 25 Catalog showing com plete line Electric Flight Equipment Accessories VL-1O1 System $1950 Hytork 48 Prop Instruction Book $900 Fast Chargers $1450 $2950 See Model Dealer order Direct add 10% Postage Handling Calif Residents also add 6% Sales Tax send Check MO No CODs Hobby Dealers send Information permitted unlisted operation will receive consideration during Scale judging Change 449 Bonus Points read follows bonus score will awarded scale-like flight 10 laps follows aTake-off0 25 points bFlight Glide0 25 points c Approach Landing. points dEngine starting bonus10 points bonus 10 points shall awarded model becomes airborne within minute starting time Time starts contestant mechanic begins cranking engine multi-engine models minute additional time shall allowed additional engine pro vided engines operating during take-off No automatic maximum scores will awarded Scale Operations paragraph 7 Bonus Points b c paragraph 9 will judged relation scalelike qualities points awarded accordingly Airborne laps points paragraph 8 engine starting bonus d paragraph 9 automatic maximum scores hope above rules will help out great selection good scale model address 118 East Wheeler St North Mankato Mion 56001 P0 BOX 2498 -AMALA MESA CALIF 92041 PHONE 17I4I 4698675 PRODUCTS SION OF VISTA LABS % 7023-D Canoga Ave Canoga Park Ca 91303 CL Scale/Stott continued page 33 f Revolve move turrets 4 cycles 20 points g Other mechaniesi options listed each0 20 points Points non-listed items shall based upon rela tive skill ingenuity effect compared listed items c d e f maximum 30 points may awarded 3 non-listed items h Inside Loop0 20 points iInverted laps 30 20 points jWing over0 20 points k Figure 80 20 points ITouch go0 20 points Model shall land normally take off again coming stop Quality landing take-off will judged Taxi0 20 points Model must land engines running come complete stop taxi complete lap flying circle come dead stop point taxi started Ten addi tional points will awarded operation engine cut-off demonstrated Note Items h i j k m will per formed after ten level laps have flown Flight Glide points Bonus Points para graph will forfeited Lighting systems will iLEfW IMOLDEO& DUCR MOLDED CANOPY Iu--/ ICANOPY__ ZEROKP 5 MUSTANG N PANPNUS NUliE 0/ OD pbo 5 WOE Os RECORD J INESMTH COUGER I3 N SPAN P NUT ANDREASON BA4-B FIS IN SPAN PNUTKITS $349 EACH PeckPeIymers RC Soaring/Pruss continued page 21 particular model-that nose low parallel horizon especially true making turn wind upwind downwind Remember example 2 groundspeed relatively slow OK As make turn go downwind coming condition similar example 3 Suddenly groundspeed increases normal usually new flier instinctively pulls nose up slow down trying fly model speed accustomed seeing flying wind stall likely occur close ground might too late effect recovery has said tends make kit manufacturers smile fuselage angle maintained through out turn would normal see sail plane increase its groundspeed proceeded downwind takes bit discipline realizing what safe angle attitude de velops confidence necessary assuring first successful flights Now began turn back wind groundspeed would diminish would appear sailplane has slowed down fuselage angle still maintained throughout turn slow ing down plane would expected knowing fuselage angle complete confi dence could maintained should also realized winds necessarily steady velocity direction gusts wind shifts occur can upset model its intended flight attitude happens flier might suddenly find model attitude sure didnt put Again fuselage angle flier must command model concerned about fuselage angle know will give safe performance Sometime during course flying will probably hear perils downwind turn never did know should hair ier upwind perilous because flierwhile flying plane down windtries slow model down fuselage angle before commences turn poor procedure time model has slowed down what thinks safe speed model stalls example 3 too close ground its back drawing board Again foregoing directed seasoned flier instinctively reacts other normal conditions new flier Neither does guarantee 10-minute maxes landing model ones feet intended help new flier get through some earlier growing pains develop confidence quickly sport relaxing what about Getting novice flier recognize sail planes flight performance emphasizing fuse lage angle has further proven suc cessful method teaching getting new modeler solo successfully An Observation Two RC Soaring can label sport successful regards contest program perhaps should further realize date has successful First newcomers less years experience have seen en joying contest circuit past summer Most fliers have experienced perfect 10minute max have also made respectable spot 76 Model Aviation RUBBER POWERED FLYING MODELS KITS S SSORIES OTHER PEANUT SCALE KITS PIESETIIPOL AIR CAMPER S MIt ORUINE TURBULENT R J3 CUR KITS $329 EACH SrRITJOLESS WONDER KIT $249 P KITS ARE NOT AVAILAELE AT TOSE DEALER ORDER DIRECT ADD 35 FOR POSTAGE P10W COMPLETE SELECTION OP OVER RU PLANS AND DRAWINGS PROM W C HANNAN GRAPHICS ALSOHUNGERPORD WHEELS TIC PROPS LEE WWI PNDT SITS NYLON BEARINGS NEW 75 CATALOG 25K HARD TO PIND ACCESSORIES KITS AND PLANS POE RUBBER POWERED MODELS landings Two-minute precision flights have made creditable 15 cumulative scores reached novice can reach achievements week-end flier gives him confidence tending first contest flier realizes has get together contest knowing able before has stimulate individuals giving go against local state national champion Secondly flexibility particular tasks ie duration 6-10 minutes precision 2-3 min utes landing zonesspeed/distance has allowed contest managers select tasks best suited own conditions same flexi bility has further kept contests becoming routine opinion current flavor tasksspeed/distance duration precision flying can maintained existing accepted flexibility would best interests sport past contest season attests way thinking Witness LSF Tournament its speed/distance task designed Donelson/ Hahn Michigan State Championships 24-minute cumulative3 round task no flight over 10 minutes penalized feature CD Gordon Pearson claimed widely accepted point modifications tasks introduced presented because serve new need purpose Although variations theme often have also refinements CDs contest planners have taken few liberties rule book same people have added new dimensions competition modifica tions have seldom caused unpleasant air above have encouraged discouraged newcomer climb ring LSFShortlines Membership October past 1600 west country join Czech oslovakia w soaring oking added challenge in LSF Send letter intent form League Silent Flight Dept M PO Box 39068 Chicago IL 60639 Include stamped self-addressed envelope address Rt 2 Box 490 Plainfield Ill 60544 3 Work concentration After fivemile run try flying AMA Stunt Pattern best Combat ship Develop ability block out pain exhaustion think about making correct decision Fly enough practice going both upright inverted overcome tendency become dizzy beginner intermediate goes route will find progress somewhat slower tedious just built bunch planes went out bash everybody end will acquire far greater level proficiency Professionals practice first compete Combat events low cost fun event can found class Rules vary through out country basically use 049 en gines 25- 40-foot lines California fly rule hut nobody knows what little devils require lot patience times suggested ulcer-prone author has 049s sale very sophisticated event found FA Combat flown international level US flown like 15-size AMA Combat will change World Cham pionships including Combat held scramble place US Team gets underway third class proclaimed decree Sunday flier special Slow Combat generally easiest place start beginner often left Junior Senior age contestants Slow Com bat will soon become new battle ground model designer because its place better plane advantage spectacular splatter Fast Combat high power high appeal event because last AMA events really no restrictions Once engine airplane hackers delight event has lost some its appeal because high horsepower ultra-trick airplanes became synonymous big-hole-in-ground falling pieces de cide design own plane sure give trick name can name after yourself win Nationals getting body mind airplanes shape can decide classes com pete also involved youll become local regional meets year throughout country well Nationals really flying might consider attending international meet like British National Championships Dutch International Spaarndam have great regional differences US noth ing like Europe attending international meeting youll rewarded experiences will give whole new perspective model flying 1974 Europeans got look American horsepower took K&B 40-powered Nemesis over some exhibition flights Yanks got first hand look I-l MOVINGLET US KNOW COMPLETETHISWhen WHERE YOU ARE GOINGI move please let us know advancesix weeks re CARD AND ATTACHquired change address Attach current MA mailing label I MAILING LABEL space cheek appropriate box below mail FROMA RECENTSubscription Dept Model Aviation 806 Fifteenth St. NW IISSUEWashington DC 20005I ICheck appropriate boxenclose paymentI 0 CHANGE OF ADDRESS0 NEW SUBSCRIPTION Non-AMA subscription rates $1200 12 months Canada United States posses sions elsewhere $1400 Membership AMA includes subscription see separate applica-I tion issueI NAMEI ADDRESSI CITY/STATE71 P___________________ LMODEL AVIATION 806 FIFTEENTH ST. NW. WASHINGTON DC 20005 January 1976 77 CL Combat/Johnson continued page 33 WANTED ideas happenings hints/kinks howto sketches photos news etc Send colum nist category concernedat address shown column photo idea printed Model Aviation will pay $5 contributor