RADIO CONTROL GIANTS ALTHOUGH DONT like admit knew little about twin-Electric-powered RC airplanes until recentlythanks letter Tyler West Hadley MA got smart real fast read intended electrically power Giant Scale Bell Airacuda host Giant Scale model builders will going Electric As Electric modeler Im delighted see plan power next Giant project Electric power system largest plane Ive built has 75-lb Sport Aerobatic ship have seen Giant Scale planes fly various Electric meets would like offer some basic information about large Electrics twins because Id like everybody tries Electric successful few basic rules thumb apply successful flying Electric Rule 1 states weight battery motors should about half allup weight aircraft Ive seen actual value vary motor battery between 40-60% all-up weight Electrics can sizeyou just need have cells cells larger capacity larger planes Right now cells can charged single charger Astro 11 2D SR Smart Charger 36 big airplane can 36 cells fly 1700 mAh cell weighs about 18 ounces geared Astro 40 weighs 145 ounces account weight wiring Giant Scale twin assume cell weighs 19 ounces Figuring 36 cells two motors weight models power supply will about 974 ounces means plane should weigh about 250 ounces 156 lb rule thumb tailored sport flying loops rolls some vertical maneuvers Scale flying aircraft like Airacuda Im sure less power will needed plane can weigh Perhaps better method calculating power model needs power loading method calculation says planes need least 50 input watts/lb take off grass achieve good climbout calculate watts assume 1 volt per cell under load can multiply number cells current draw get input watts Thirtysix cells 30 amps gives about 108 watts conservative estimate because todays cells give about 11 volts 30 amp draw models weight 16 lb will have 675 watts/lb enough power fly simple aerobatics model weighs 20 lb youll have 54 watt/lb will still fly type model suggest two Astro geared 40s Because readily available motors will happy 18 cells drawing 30 amps did pick 30 amps Thats just common value amount current drawn full throttle large sport plane actual value will depend size type prop chosen long will plane fly full throttle Assuming 30 amps 1700 mAh cells will get motor run little less three half minutes Reserving full power takeoffs maneuver entries flight eight minutes will no problem have seen 145 lb de Havilland Mosquito fly two Astro 40s using 14 x 8 Zinger props draw 30 amps wing area 1000 sq flew five-and-a-half minutes flown very exciting mannerlots fast low-level strafing runs retracts used clear MonoKote covering finish airbrushed Floquil brand paint Tyler also provides comprehensive source list various power components suggested Airacuda costs daunting substantially less glow-powered Giant twin notes battery pack charger would about $160 motors would $143 speed control would $95 plus $450 per 1700 mAh cell also recommends building up own power packs using copper braid subject Tylers letter didnt address need extended prop shafts scale shape Airacudas nacelles demand prop shafts will 84 Model Aviation 4Jesse Mitchell Kerhonkson NY posing favorite seaplane de Havilland Beaver truly stunning RC model Jesse Mitchells Bell Airacuda built about 10 years ago need have scale-size bugs sprayed Jesse says model dire need repair Mitchells Ag-Cat equipped scale-size spraying rig 8 ~- o _5 0 0 t dC-i - ~ 0id 0 0dri - 0 0-0 OH 0oP-0 CC~ 88 0 0 0 C 0 0 ft ~- ~ oft o 0 0-I i10-o ~ -CNCCC00 o 0-0 -0000 2C0~ 0-0 CCC00 CCC 0 ~ 3Z3~ CCCCCCC CCCCC CC CC CrCrCr CCCCCCNCC CCCC.4 CC CC CC CCC NCCCCNCCC CC CC CCC CCNCCC CC CC flCCCC CC CC CC CC CrCCCC3CC CCC CCC CC NCCCNCNC 0 CC Cr NCCCCCrCr Cr z0 m iZ3 CC C 4CCCCrCrCr CCCCCCCCCrCr 4CCCCCCCCCCC C CrCr OCCCNCCr OCOCOC 1 ii Cr CRC NC C CCC NC 0 C C CCC C Cr CCC OCrNCCC CCC CCC C C -C'CC. 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Edition: Model Aviation - 1997/05
Page Numbers: 84, 85
Edition: Model Aviation - 1997/05
Page Numbers: 84, 85
RADIO CONTROL GIANTS ALTHOUGH DONT like admit knew little about twin-Electric-powered RC airplanes until recentlythanks letter Tyler West Hadley MA got smart real fast read intended electrically power Giant Scale Bell Airacuda host Giant Scale model builders will going Electric As Electric modeler Im delighted see plan power next Giant project Electric power system largest plane Ive built has 75-lb Sport Aerobatic ship have seen Giant Scale planes fly various Electric meets would like offer some basic information about large Electrics twins because Id like everybody tries Electric successful few basic rules thumb apply successful flying Electric Rule 1 states weight battery motors should about half allup weight aircraft Ive seen actual value vary motor battery between 40-60% all-up weight Electrics can sizeyou just need have cells cells larger capacity larger planes Right now cells can charged single charger Astro 11 2D SR Smart Charger 36 big airplane can 36 cells fly 1700 mAh cell weighs about 18 ounces geared Astro 40 weighs 145 ounces account weight wiring Giant Scale twin assume cell weighs 19 ounces Figuring 36 cells two motors weight models power supply will about 974 ounces means plane should weigh about 250 ounces 156 lb rule thumb tailored sport flying loops rolls some vertical maneuvers Scale flying aircraft like Airacuda Im sure less power will needed plane can weigh Perhaps better method calculating power model needs power loading method calculation says planes need least 50 input watts/lb take off grass achieve good climbout calculate watts assume 1 volt per cell under load can multiply number cells current draw get input watts Thirtysix cells 30 amps gives about 108 watts conservative estimate because todays cells give about 11 volts 30 amp draw models weight 16 lb will have 675 watts/lb enough power fly simple aerobatics model weighs 20 lb youll have 54 watt/lb will still fly type model suggest two Astro geared 40s Because readily available motors will happy 18 cells drawing 30 amps did pick 30 amps Thats just common value amount current drawn full throttle large sport plane actual value will depend size type prop chosen long will plane fly full throttle Assuming 30 amps 1700 mAh cells will get motor run little less three half minutes Reserving full power takeoffs maneuver entries flight eight minutes will no problem have seen 145 lb de Havilland Mosquito fly two Astro 40s using 14 x 8 Zinger props draw 30 amps wing area 1000 sq flew five-and-a-half minutes flown very exciting mannerlots fast low-level strafing runs retracts used clear MonoKote covering finish airbrushed Floquil brand paint Tyler also provides comprehensive source list various power components suggested Airacuda costs daunting substantially less glow-powered Giant twin notes battery pack charger would about $160 motors would $143 speed control would $95 plus $450 per 1700 mAh cell also recommends building up own power packs using copper braid subject Tylers letter didnt address need extended prop shafts scale shape Airacudas nacelles demand prop shafts will 84 Model Aviation 4Jesse Mitchell Kerhonkson NY posing favorite seaplane de Havilland Beaver truly stunning RC model Jesse Mitchells Bell Airacuda built about 10 years ago need have scale-size bugs sprayed Jesse says model dire need repair Mitchells Ag-Cat equipped scale-size spraying rig 8 ~- o _5 0 0 t dC-i - ~ 0id 0 0dri - 0 0-0 OH 0oP-0 CC~ 88 0 0 0 C 0 0 ft ~- ~ oft o 0 0-I i10-o ~ -CNCCC00 o 0-0 -0000 2C0~ 0-0 CCC00 CCC 0 ~ 3Z3~ CCCCCCC CCCCC CC CC CrCrCr CCCCCCNCC CCCC.4 CC CC CC CCC NCCCCNCCC CC CC CCC CCNCCC CC CC flCCCC CC CC CC CC CrCCCC3CC CCC CCC CC NCCCNCNC 0 CC Cr NCCCCCrCr Cr z0 m iZ3 CC C 4CCCCrCrCr CCCCCCCCCrCr 4CCCCCCCCCCC C CrCr OCCCNCCr OCOCOC 1 ii Cr CRC NC C CCC NC 0 C C CCC C Cr CCC OCrNCCC CCC CCC C C -C'CC. 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