FREE FLIGHT INDOOR 1T7 b jiiIin rv~ J FYJ L-- ONE HOUR OFFICIALLY Yet Two weeks after 6358 unofficial flight Steve Brown posted 58 both AMA World Record sanctions place air cold drafty second attempt hit side damaged model Two sessions later air drifting during morning outside temperature about 72 sunny sky About 2 pm Steve getting 33 minutes halfmotors began winding Warren Williams Hermann Andersen ready time him Steve attached wound motor front hook model put knotted end over rear hook happened motor came forward shattering motorstick breaking propeller Steve calmly looked up said guess wouldnt doing today wasnt sure knot pulled out motor broke result same Later afternoon Bob Randolph tried set record model came down 52 minutes plus photo shows Steve model just after 6358 flight Electric Duration Report same Santa Ana session Chuck Lindley Ken Johnson flying Electric duration models used Kenway geared power setups After previous session model flew about 11 minutes Ken tried several new concepts could manage 815 Lindley flew outstanding 1316 Kenway high thrustline pusher setup center gravity CG about 105% chord Put Things Proper Perspective day recently chaotic work schedule let attend session Over-TheHill Gang group retired people fly sorts Indoor models Bedford Texas site Thursday time owners Scale models P-24s Electric models departed looked around Easy B fliers left Jesse Shepherd referred Kid Suddenly realized age 65 youngest flier several years Capacitor Charge Technique Several members OverThe-Hill Gang experimenting Electric models use capacitors instead batteries overheard conversation suggested using current source charge capacitors key preventing overcharge breakdown monitor voltage digital voltmeter terminate charging soon voltage peaks drops few millivolts allows absolute maximum charge cant easily obtained other way Indoor Group Thanks contacts made WCh responses previous announcements Indoor Group now almost 40 strong growing takes join send E-mail address rten@intexnet group continues receive advance notice special unusual Indoor events happen/are scheduled model clubs fly Indoor should have least member able send/receive E-mail free E-mail schemes now coming line takes computer modem Indoor Electric Duration RC Did know event existed event #627 1996-97 Competition Regulations described single paragraph model must meet two specifications 21 ounces maximum weight maximum wing loading 35 ounces per square foot event timed like other Indoor duration event CD may require circular oval March 1997 133 Steve Brown just after 6358 unofficial record flight Best official flight date 5800 Some prop blade outlines being evaluated Jim Clem test program details text Tenny photo Test rectangle used determine prop blade area determining weight per unit area comparing blade weight figure-eight orbits timer record trial Ernest Harwood posted 224 flight included three orbits model weighs just four ounces wing area 173 square inches model resembled overgrown Pennyplane stark contrast 21-ounce model could have 864 square inches area Obviously poses tremendous challenge both aerodynamic structural aspects Flight speed wing loading about eight feet per second about 55 mph picture hazard 21-ounce model flying speed As chairman Indoor Contest Board feel certain amount uneasiness over existence Indoor event have no control over Flying Opportunities Because space limitations section will no longer carried am working possibility publishing greatly expanded contest/flying session listing E-Mail form see Indoor Group Staggering Climbs Some time ago some comments about models stagger around after launch fly straight instead settling smooth climb Otto Curth adds comments Offset stab left like wing use thin boom allows boom twist right give left turn Make boom rectangular section deepest dimension vertical retain stab incidence setting got hint Bob Warmann allowed Bipe Pennyplane make six-foot-diameter circles under full torque didnt climb until circle got bigger Test Techniques As promised column will have coverage various test techniques used Indoor fliers advance state art tests will rubber tests also test balsa strength stiffness flight trim other important factors Prop Testing Jim Clem has conducting intensive literature research props has applied data own test programs Part research involves blade shape blade areas photo shows small selection Jims large collection prop blade templates master template identified various comments area always documented Another photo shows Jim computes blade area weighs rectangle known area cut same material template can calculate weight/unit area material weigh blade calculate blade area finished prop must tested Until recently Jim rely real flight tests difficult coordinate other activity may going site An alternate solution RTP Round-The-Pole flights living room venue limits him five-foot radius has recreation room 14 feet square plans move tests upstairs since rec room can isolated drafts easily RTP flying introduces some factors prevent totally accurate test comparative basis following prop parameters can measured 1 General operation wobble tracking etc 2 Average rpm test motor standardized launch torque compared other props Note props compared should weigh same same rubber weight should used avoid changing models CG RTP also allows model testing 1 Level flight torque particular prop should checked two three launches sure good result certainly easier catch model torque measurements site 2 Basic flight trim Flight trim can closely approximated unless real flight circle much larger circle diameter forced tether 3 Cruise rpm flight speed given prop average rpm over complete flight given launch torque Full launch torque cant reasonably accommodated since model will climb far too highmaybe getting out control Touchdown Torque previous issue reported Jim Clems glide testing part contest preflight activity use similar technique double-check final trim Cat test flying anytime suspect marginal trim Cat flight lands too turns launch model arms-length above head restart watch flight obviously over- underelevated make trim change before launching have arbitrary definition touchdown torqueit torque allows model reach floor about 20 seconds such launch relaunch technique has two uses First first launch reaches floor less 20 seconds flight trim fairly close flight has interrupted hangup running wall relaunches allow gather additional trim rpm data adding time however launches takes reach 20-second descent previous flight time get better estimate average rpm get chance fine-tune trim also use technique high ceiling sites refine trim Touchdown torque high model under-elevated also model over-elevated Relaunches give opportunity evaluate models trim having make another full-bore test flight Rubber Testing Boeing Hawks newsletter edited Gene Stubbs John Lenderman emphasizes need test different batches rubber well different samples same batch trying maximum performance sample tested cuts 040 strip ties 3 inch loop records four parameters 1 maximum stretched length 2 maximum number turns 3 torque max turns 4 torque sample unwound one-half max turns* *Note max turns torque readings given number turns will somewhat subjective since max turns accurately measured winding until motor breaks subtracting turn parameters measured successive days compared order select best rubber batch important parameter four last measures torque corresponding cruise portion flight Some batches have high maximum torque fully wound low cruise torque occurred would quick way select rubber size given airplanesee flies motor backed down 50% max winds sinks go stronger motor Site Searches Boeing Hawks newsletter edited Gene Stubbs other Indoor fliers can have dreary blimp hangars salt mines best place fly MiniSticks anyway atrium 777 office building Everett went meeting naturally packed MiniStick winder briefcase meeting over lunchtime headed atrium Bright sunlight streaming down five-story high skylight smiling secretaries riding escalators up down engineers paused around balcony railings watch airplane secretariesnot sure put up several exciting flights including five-minute beauty Model Aviation
Edition: Model Aviation - 1997/03
Page Numbers: 133, 134
Edition: Model Aviation - 1997/03
Page Numbers: 133, 134
FREE FLIGHT INDOOR 1T7 b jiiIin rv~ J FYJ L-- ONE HOUR OFFICIALLY Yet Two weeks after 6358 unofficial flight Steve Brown posted 58 both AMA World Record sanctions place air cold drafty second attempt hit side damaged model Two sessions later air drifting during morning outside temperature about 72 sunny sky About 2 pm Steve getting 33 minutes halfmotors began winding Warren Williams Hermann Andersen ready time him Steve attached wound motor front hook model put knotted end over rear hook happened motor came forward shattering motorstick breaking propeller Steve calmly looked up said guess wouldnt doing today wasnt sure knot pulled out motor broke result same Later afternoon Bob Randolph tried set record model came down 52 minutes plus photo shows Steve model just after 6358 flight Electric Duration Report same Santa Ana session Chuck Lindley Ken Johnson flying Electric duration models used Kenway geared power setups After previous session model flew about 11 minutes Ken tried several new concepts could manage 815 Lindley flew outstanding 1316 Kenway high thrustline pusher setup center gravity CG about 105% chord Put Things Proper Perspective day recently chaotic work schedule let attend session Over-TheHill Gang group retired people fly sorts Indoor models Bedford Texas site Thursday time owners Scale models P-24s Electric models departed looked around Easy B fliers left Jesse Shepherd referred Kid Suddenly realized age 65 youngest flier several years Capacitor Charge Technique Several members OverThe-Hill Gang experimenting Electric models use capacitors instead batteries overheard conversation suggested using current source charge capacitors key preventing overcharge breakdown monitor voltage digital voltmeter terminate charging soon voltage peaks drops few millivolts allows absolute maximum charge cant easily obtained other way Indoor Group Thanks contacts made WCh responses previous announcements Indoor Group now almost 40 strong growing takes join send E-mail address rten@intexnet group continues receive advance notice special unusual Indoor events happen/are scheduled model clubs fly Indoor should have least member able send/receive E-mail free E-mail schemes now coming line takes computer modem Indoor Electric Duration RC Did know event existed event #627 1996-97 Competition Regulations described single paragraph model must meet two specifications 21 ounces maximum weight maximum wing loading 35 ounces per square foot event timed like other Indoor duration event CD may require circular oval March 1997 133 Steve Brown just after 6358 unofficial record flight Best official flight date 5800 Some prop blade outlines being evaluated Jim Clem test program details text Tenny photo Test rectangle used determine prop blade area determining weight per unit area comparing blade weight figure-eight orbits timer record trial Ernest Harwood posted 224 flight included three orbits model weighs just four ounces wing area 173 square inches model resembled overgrown Pennyplane stark contrast 21-ounce model could have 864 square inches area Obviously poses tremendous challenge both aerodynamic structural aspects Flight speed wing loading about eight feet per second about 55 mph picture hazard 21-ounce model flying speed As chairman Indoor Contest Board feel certain amount uneasiness over existence Indoor event have no control over Flying Opportunities Because space limitations section will no longer carried am working possibility publishing greatly expanded contest/flying session listing E-Mail form see Indoor Group Staggering Climbs Some time ago some comments about models stagger around after launch fly straight instead settling smooth climb Otto Curth adds comments Offset stab left like wing use thin boom allows boom twist right give left turn Make boom rectangular section deepest dimension vertical retain stab incidence setting got hint Bob Warmann allowed Bipe Pennyplane make six-foot-diameter circles under full torque didnt climb until circle got bigger Test Techniques As promised column will have coverage various test techniques used Indoor fliers advance state art tests will rubber tests also test balsa strength stiffness flight trim other important factors Prop Testing Jim Clem has conducting intensive literature research props has applied data own test programs Part research involves blade shape blade areas photo shows small selection Jims large collection prop blade templates master template identified various comments area always documented Another photo shows Jim computes blade area weighs rectangle known area cut same material template can calculate weight/unit area material weigh blade calculate blade area finished prop must tested Until recently Jim rely real flight tests difficult coordinate other activity may going site An alternate solution RTP Round-The-Pole flights living room venue limits him five-foot radius has recreation room 14 feet square plans move tests upstairs since rec room can isolated drafts easily RTP flying introduces some factors prevent totally accurate test comparative basis following prop parameters can measured 1 General operation wobble tracking etc 2 Average rpm test motor standardized launch torque compared other props Note props compared should weigh same same rubber weight should used avoid changing models CG RTP also allows model testing 1 Level flight torque particular prop should checked two three launches sure good result certainly easier catch model torque measurements site 2 Basic flight trim Flight trim can closely approximated unless real flight circle much larger circle diameter forced tether 3 Cruise rpm flight speed given prop average rpm over complete flight given launch torque Full launch torque cant reasonably accommodated since model will climb far too highmaybe getting out control Touchdown Torque previous issue reported Jim Clems glide testing part contest preflight activity use similar technique double-check final trim Cat test flying anytime suspect marginal trim Cat flight lands too turns launch model arms-length above head restart watch flight obviously over- underelevated make trim change before launching have arbitrary definition touchdown torqueit torque allows model reach floor about 20 seconds such launch relaunch technique has two uses First first launch reaches floor less 20 seconds flight trim fairly close flight has interrupted hangup running wall relaunches allow gather additional trim rpm data adding time however launches takes reach 20-second descent previous flight time get better estimate average rpm get chance fine-tune trim also use technique high ceiling sites refine trim Touchdown torque high model under-elevated also model over-elevated Relaunches give opportunity evaluate models trim having make another full-bore test flight Rubber Testing Boeing Hawks newsletter edited Gene Stubbs John Lenderman emphasizes need test different batches rubber well different samples same batch trying maximum performance sample tested cuts 040 strip ties 3 inch loop records four parameters 1 maximum stretched length 2 maximum number turns 3 torque max turns 4 torque sample unwound one-half max turns* *Note max turns torque readings given number turns will somewhat subjective since max turns accurately measured winding until motor breaks subtracting turn parameters measured successive days compared order select best rubber batch important parameter four last measures torque corresponding cruise portion flight Some batches have high maximum torque fully wound low cruise torque occurred would quick way select rubber size given airplanesee flies motor backed down 50% max winds sinks go stronger motor Site Searches Boeing Hawks newsletter edited Gene Stubbs other Indoor fliers can have dreary blimp hangars salt mines best place fly MiniSticks anyway atrium 777 office building Everett went meeting naturally packed MiniStick winder briefcase meeting over lunchtime headed atrium Bright sunlight streaming down five-story high skylight smiling secretaries riding escalators up down engineers paused around balcony railings watch airplane secretariesnot sure put up several exciting flights including five-minute beauty Model Aviation
