FREE FLIGHT INDOOR fW A-6 FOLLOW-UP has lot activity Internet regarding International E-Mail A-6 Indoor Contest announced November 1997 column Special note request A-6 plan mentioned please send requests R Schroeder 4111 West 98 St Overland Park KS 66207 Any other address will delay receipt plan Access web site http/n lemmacomla6/ap6/theap6html step-bystep text-and-picture guide building A-6 Del Ogren has done excellent job familiar what possible Internet will surprised Addendum A-6 Rules left out rules given column A-6 propeller blades flat pieces cut A2 sheet cannot cambered twisted total diameter can exceed six inches makes easy prop beginners make Despite crude arrangement A-6 props appear reasonably efficient Indoor RC Electric Duration Follow-up Bob Wilder has done againtwo ways First has flown Electric FF model no radio powered two 50 mA cells 10 minutes Bedford TX site Note currently no AMA class model follows guidelines developed Ken Johnson others flying Tustin hangars Santa Ana preliminary submitting rules proposal class Second has drastically redesigned RC Duration model airplane Indoor RC Electric AMA event #627 flown 4119 Bedford Boys Ranch Cat site Although Bob has become fairly good RC pilot model flown Ernie Harwood previous model during its record flight model weighed 114 grams wing area 248 square inches motor German coreless driving carbon-fiber propeller through handmade 81 ratio gear box power four 350-tnAh cells Indoor Group now has 130 members Join us sending request Bud Tenny rten@nstarnet Note change address time issue arrives previous address may phased out Current members please update address lists Prop Testing via Video previous column mentioned Jim Clems prop testing basic technique entails using small electric motor drive prop under test photo shows close-up mechanism motor gear mechanism mounted pivoted bar drives torque scale shown Jim records voltage current required drive prop some given torque level rpm measured present using mechanical tachometer loads system somewhat An electronic tachometer planned will remove load greater accuracy After props input parameters torque vs rpm measured moved pendulumtype thrust stand driven same test power photo shows thrust stand second test measures thrust developed test prop test power input adding video camera mix Jim can record props performance torque stand play hack slow motion single-frame stop-frame Photos show playback session Before test recorded Jim made sure prop tracking botb blades rotating same plane Under 4 inch-ounces torque photos show blade flaring other white rectangle front prop sets reference point visual distance between prop leading edge photos shows amount unequal flare Before used video camera Jim used StrobotacrM watch prop under test StrobotnerM bright strobe light driven calibrated oscillator oscillator set correct frequency prop illuminated same position revolution appears stand still Reading oscillator frequency gives revolutions/second multiply 60 get rpm instrument synchronized prop possible view distortion prop applied torque No-Cal Scale Events As someone dedicated duration events am both amazed bewildered possible variety No-Cal class well models fly item came Oklahoma City group OKC Rules Civilian No-Cal Mass Launch 1 Model must reasonable representation civilian aircraft produced after 1920 have unusual project bring documentation 2 Minimum weight 62 grams 3 Maximum prop diameter seven inches 4 Maximum wing chord measured halfway between center wing March1998 117 Jim Clems prop torque stand see text Tenny photo Rpm measured mechanical tachometer Torque scale rear Clems thrust stand prop driven predetermined torque resulting thrust measured Clem photo Replay video record torque standReplay video record torque stand first blade White rectangle used asecond blade Note change flare reference Tenny photocompared first blade Tenny photo Laser Cut Rubber Powered Flying Models Kit #201 Over 70 Laser Cut Parts Kit #202 Over 60 Laser Cut Parts Kit #203 Over 50 Laser Cut Parts #204 Over 50 Laser Cut Parts Kit #205 Over 50 Laser Cut Parts Introducing five laser cut kits biggest new name Free Flight Aircraft.Dumas Products walnut scale 17-1/2 wing span models come Precision Laser Cut Parts hand selected balsa injection molded propeller FAl Contest rubber plastic wheels vacuum molded plastic parts full color peel stick decal set light weight colored tissue comprehensive plans instructions rubber powered kit Call today 1-800-458-2828 Ext 800 ask information packet Dumas line Rubber Powered Flying Models dumas aircraft DUMAS PRODUCTS INC 9O9AMA E 17th St Tucson AZ 85719 Phone 520-623-3742 Fax 520-620-1329 E-MAtL dumas@azstametcom tip 35 inches monoplanes sum chords both wings biplane must no greater 55 inches measured above 5 Maximum wingspan 16 inches maximum length 16 inches measured front prop rear airplane Power Train Analysis Boeing Hawks newsletter edited Gene Stubbs CO2 vs Mini-Electric Last month gave some people impression Electric better CO2 alternative rubber powerespecially beginners course thats what meanteach has its place Let summarize similarities differences see based limited experience CO2 MiniElectric adaptations Power Weight CO2 clear winner category Electric demands very light airframe make up weight motor batteriestheres never excess power may hold two-capacitor systems advertised Kenway System Cost Ill guess MiniElectric about 1/3 cost comparable CO2 system average-size Outdoor Free Flight models difference becomes greater case Peanut Scale-size systems Electric cheaper willing rewind disk camera motors find own gears Fuel Cost CO2 can get pretty expensive using soda cartridges around 25 cents per flight didnt take long invest refillable tank Ni-Cd regular flashlight batteries used recharge Electric flight packs cheaper easier come Charge Time Filling CO2 tank instantaneous find helps let warm up minute afterward Electric system recharge time can long three four minutes being careful batteries Flight Profile Very similar has modest power burst long cruise plateau gradual tailoff Gentle power-on landings typical both systems Predictability Electric has some advantage never seem know much CO2 Im getting tank charge Consequently tend fly CO2 airplane limited ceiling sites Prop Size trying get out CO2 motor will use largest prop lowest rpm possible Electrics tend use smaller props higher rpm get peak performance either case prop will smaller used rubber motor helpful landing gear length glide performance Duration Run time depends lot things think its safe say Electric CO2 comparable regard Typical flight times around two minutes usually want outdoors Either should give duration rubber power same airplane Wear Tear CO2 Electric avoid considerable airplane damage caused rubber motors Such damage includes rubber-lube spatter knots poking out fuselage covering damage broken motors CO2 has advantage over Electric since airframe can made stronger heavier Noise Geared Mini-Electric systems usually make obnoxious whine CO2 motors have pleasant scale-like putt-putt sound Jets Hi-Line sells Mini-Electric ducted fan unit Ive heard rumors English company Ripmax about release tuneable CO2 jet engine develops four ounces thrust over 30-second run time Collectibility CO2 motors particularly little Gasparins very appealing engine collectorssomething cannot said mass-produced Mini-Electric motors So tired rubber power weigh above choices decide alternative power system better try both Now rubber purists will probably mad Lets hear send reasons rubber power way go Model Aviation flight fun Peck-Polymers planes plans props paper s next caper CO2 engines US Czechoslovakia tremendous assortment______ types sizes catalog kits accessories engines nine-cylinder radial engineand endless ideas available $400 PeckP /yaers stop shopping rubber power C02 needs P 0 BOX 710388 MASANTEE CA 820720388 USAt818 448-1818FAX t619 4481833
Edition: Model Aviation - 1998/03
Page Numbers: 117, 118
FREE FLIGHT INDOOR fW A-6 FOLLOW-UP has lot activity Internet regarding International E-Mail A-6 Indoor Contest announced November 1997 column Special note request A-6 plan mentioned please send requests R Schroeder 4111 West 98 St Overland Park KS 66207 Any other address will delay receipt plan Access web site http/n lemmacomla6/ap6/theap6html step-bystep text-and-picture guide building A-6 Del Ogren has done excellent job familiar what possible Internet will surprised Addendum A-6 Rules left out rules given column A-6 propeller blades flat pieces cut A2 sheet cannot cambered twisted total diameter can exceed six inches makes easy prop beginners make Despite crude arrangement A-6 props appear reasonably efficient Indoor RC Electric Duration Follow-up Bob Wilder has done againtwo ways First has flown Electric FF model no radio powered two 50 mA cells 10 minutes Bedford TX site Note currently no AMA class model follows guidelines developed Ken Johnson others flying Tustin hangars Santa Ana preliminary submitting rules proposal class Second has drastically redesigned RC Duration model airplane Indoor RC Electric AMA event #627 flown 4119 Bedford Boys Ranch Cat site Although Bob has become fairly good RC pilot model flown Ernie Harwood previous model during its record flight model weighed 114 grams wing area 248 square inches motor German coreless driving carbon-fiber propeller through handmade 81 ratio gear box power four 350-tnAh cells Indoor Group now has 130 members Join us sending request Bud Tenny rten@nstarnet Note change address time issue arrives previous address may phased out Current members please update address lists Prop Testing via Video previous column mentioned Jim Clems prop testing basic technique entails using small electric motor drive prop under test photo shows close-up mechanism motor gear mechanism mounted pivoted bar drives torque scale shown Jim records voltage current required drive prop some given torque level rpm measured present using mechanical tachometer loads system somewhat An electronic tachometer planned will remove load greater accuracy After props input parameters torque vs rpm measured moved pendulumtype thrust stand driven same test power photo shows thrust stand second test measures thrust developed test prop test power input adding video camera mix Jim can record props performance torque stand play hack slow motion single-frame stop-frame Photos show playback session Before test recorded Jim made sure prop tracking botb blades rotating same plane Under 4 inch-ounces torque photos show blade flaring other white rectangle front prop sets reference point visual distance between prop leading edge photos shows amount unequal flare Before used video camera Jim used StrobotacrM watch prop under test StrobotnerM bright strobe light driven calibrated oscillator oscillator set correct frequency prop illuminated same position revolution appears stand still Reading oscillator frequency gives revolutions/second multiply 60 get rpm instrument synchronized prop possible view distortion prop applied torque No-Cal Scale Events As someone dedicated duration events am both amazed bewildered possible variety No-Cal class well models fly item came Oklahoma City group OKC Rules Civilian No-Cal Mass Launch 1 Model must reasonable representation civilian aircraft produced after 1920 have unusual project bring documentation 2 Minimum weight 62 grams 3 Maximum prop diameter seven inches 4 Maximum wing chord measured halfway between center wing March1998 117 Jim Clems prop torque stand see text Tenny photo Rpm measured mechanical tachometer Torque scale rear Clems thrust stand prop driven predetermined torque resulting thrust measured Clem photo Replay video record torque standReplay video record torque stand first blade White rectangle used asecond blade Note change flare reference Tenny photocompared first blade Tenny photo Laser Cut Rubber Powered Flying Models Kit #201 Over 70 Laser Cut Parts Kit #202 Over 60 Laser Cut Parts Kit #203 Over 50 Laser Cut Parts #204 Over 50 Laser Cut Parts Kit #205 Over 50 Laser Cut Parts Introducing five laser cut kits biggest new name Free Flight Aircraft.Dumas Products walnut scale 17-1/2 wing span models come Precision Laser Cut Parts hand selected balsa injection molded propeller FAl Contest rubber plastic wheels vacuum molded plastic parts full color peel stick decal set light weight colored tissue comprehensive plans instructions rubber powered kit Call today 1-800-458-2828 Ext 800 ask information packet Dumas line Rubber Powered Flying Models dumas aircraft DUMAS PRODUCTS INC 9O9AMA E 17th St Tucson AZ 85719 Phone 520-623-3742 Fax 520-620-1329 E-MAtL dumas@azstametcom tip 35 inches monoplanes sum chords both wings biplane must no greater 55 inches measured above 5 Maximum wingspan 16 inches maximum length 16 inches measured front prop rear airplane Power Train Analysis Boeing Hawks newsletter edited Gene Stubbs CO2 vs Mini-Electric Last month gave some people impression Electric better CO2 alternative rubber powerespecially beginners course thats what meanteach has its place Let summarize similarities differences see based limited experience CO2 MiniElectric adaptations Power Weight CO2 clear winner category Electric demands very light airframe make up weight motor batteriestheres never excess power may hold two-capacitor systems advertised Kenway System Cost Ill guess MiniElectric about 1/3 cost comparable CO2 system average-size Outdoor Free Flight models difference becomes greater case Peanut Scale-size systems Electric cheaper willing rewind disk camera motors find own gears Fuel Cost CO2 can get pretty expensive using soda cartridges around 25 cents per flight didnt take long invest refillable tank Ni-Cd regular flashlight batteries used recharge Electric flight packs cheaper easier come Charge Time Filling CO2 tank instantaneous find helps let warm up minute afterward Electric system recharge time can long three four minutes being careful batteries Flight Profile Very similar has modest power burst long cruise plateau gradual tailoff Gentle power-on landings typical both systems Predictability Electric has some advantage never seem know much CO2 Im getting tank charge Consequently tend fly CO2 airplane limited ceiling sites Prop Size trying get out CO2 motor will use largest prop lowest rpm possible Electrics tend use smaller props higher rpm get peak performance either case prop will smaller used rubber motor helpful landing gear length glide performance Duration Run time depends lot things think its safe say Electric CO2 comparable regard Typical flight times around two minutes usually want outdoors Either should give duration rubber power same airplane Wear Tear CO2 Electric avoid considerable airplane damage caused rubber motors Such damage includes rubber-lube spatter knots poking out fuselage covering damage broken motors CO2 has advantage over Electric since airframe can made stronger heavier Noise Geared Mini-Electric systems usually make obnoxious whine CO2 motors have pleasant scale-like putt-putt sound Jets Hi-Line sells Mini-Electric ducted fan unit Ive heard rumors English company Ripmax about release tuneable CO2 jet engine develops four ounces thrust over 30-second run time Collectibility CO2 motors particularly little Gasparins very appealing engine collectorssomething cannot said mass-produced Mini-Electric motors So tired rubber power weigh above choices decide alternative power system better try both Now rubber purists will probably mad Lets hear send reasons rubber power way go Model Aviation flight fun Peck-Polymers planes plans props paper s next caper CO2 engines US Czechoslovakia tremendous assortment______ types sizes catalog kits accessories engines nine-cylinder radial engineand endless ideas available $400 PeckP /yaers stop shopping rubber power C02 needs P 0 BOX 710388 MASANTEE CA 820720388 USAt818 448-1818FAX t619 4481833