WINTER finally over everyone getting ready start racing again either dusting off last years favorite plane building shiny new fact some parts South West several contests have already run year should better last year racing Lets try help get new flier involved 1979 Take guy seems little interested next contest Show him everything works contest scored tell him like compete Sure takes time good info can explained car van way contest holding contest invite friend come help flag time score another good way help guys get involved Pylon Racing never dull always excitement has get mildly involved get bitten bug racing event almost everyone interested Club 500 Sport Quarter Midget Formula find out action summer turn competition schedule section magazine will tell contests area well what events will run want start out Formula two classes areas country Standard Expert two classes generally flown together Standard class set up beginner area winners both classes end race separate Standard class Expert highest finishing Standard class winner could beat Expert flier would win Standard flier advan ces Expert consistently turns times mid-twenties may declare himself Expert time Once Expert class rest year area have formed Ohio Pylon Racing Association Almost fliers belong group best help new flier promoting racing may have group club area set up same reasons end season Championship Race held top fliers country Formula race open members NMPRA have qualify must finish top 20% NMPRA district finish top 10 AMA Nationals officer NMPRA order qualify Formula Championship Race NMPRA Championship big Formula fliers com pete year qualify held end Octoberusually South West have good chance decent weather Everyone looks forward race year NMPRA also holds Quarter Mid get Championship September year Rough River KY beautiful area event open NMPRA members compete Quarter Midget NMPRA Championship Trophies awarded both Quarter Midget Formula Championships also big contest May held Bakersfield CA year race has become very popular attracting guys over world compete great racing over country can always use contests competitors larger race better competition first contests season held March 1718 1979 Western District rained off entire weekend still good Formula contest Gary Hover won Expert class best time being 1187 Dave Shadel third Expert fastest time 1163 Leonard Walker tops Standard division also fastest time Standards 1291 way Standard Expert classes flown together race Gary McPike CD Quarter Midget racing began January Continued r. 111 28 Model Aviation Pilots have 90 seconds start engines ana Tind tune last rpm necaic vaive setting One-half father-son team ready start /4-midget race Dave Mar-tin watches flagman HOBBYPOXY FORMULA 3 THIXOTROPIC EPOXY GLUE NO SAGS. NORIJNS. NO DR PS. Formula 3 specially formulated gel-like viscosity allowing applied vertical surfaces thin edges other problem areas other glues just run off makes Formula 3 perfect planking building up reinforcing fillets joints sealing cracks filling holes joining poorly fitted badly die-crushed parts . hundred other things youve always wished kind glue now its made Hobbypoxy leader epoxy glues model building Formula 3 packaged two four-ounce cans has working time hour cures hard overnight mmmiv minuws L Division Pettit Paint co Inc 36 Pine Street Rockaway NJ 07866 RC Pylon/Hager continued page 28 28 West Coast race held Mile Square Park Fountain Valley CA hosted QMRC Vince Stag naro CD 17 fliers braved cold winds rain hail snow yes snow southern California sounds like Ohio Due weather four rounds flown Tom Christopher Bob Novak tied lead Tom took prize since fast time 1395 want keep readers informed what going racing throughout country Send us contest reports anything else would like share readers Bill Hager 5200 Rye Dr Dayton OH 45424 AMA Free Flight/Prey continued page 37 vertical fin makes excellent tab instead cutting fin Different thicknesses balsa wood can glued trailing edge stock increase turn wood can shaved off trailing edge stock decrease turn tab used turn adjustment no specific location shown plans locate tab near base trailing edge vertical fin Locating tab near top vertical fin will tend cause rolling effect around Longitu dinal axis well turn thereby achieve desired results 2 Right-or-left engine thrust Right- left-thrust viewed top angle formed line drawn lengthwise through center crankshaft measured either right left center line fuselage Cocking engine thrust line off center will cause model turn direction engine thrust line Engine thrust offset effective low speeds speed increased thrust offset becomes less effective rea son thrust offset used primarily control initial part climb vertical fin rudder tab offset used control remainder power climb Finally model must have stability Without stability around axis rota tion doomed self destruction Stability ability model resist changes normal flight also ability upset outside force such gust wind recover return normal flight designer model determined certain stability factors such dihedral angle size stabilizer vertical fin too must decide certain stability factors such angles incidence wing stabilizer amount rudder-tab offset engine-thrust offset etc have vital role eventual stability model about ready go flying well just Part Two Meanwhile spare moments become familiar checking decalage models using bubble protractor spirit level Use spirit level establish reference line convenience zero degrees bubble protractor measure angle incidence wing stabilizer angular difference tween decalage same measure down thrust Also experiment different thicknesses wood see much takes change angle incidence degree wing stabilizer dont have bubble protractor Sears has several inex pensive types available retail cata logue order example Angle Finder #93987 retails Los Angeles $399 Protractor Level #9-3990 retails $289 Either style excellent model use Also check hardware stores precision style bubble protractor dont overlook Army Surplus stores obsolete propeller blade angle protractor Lastly experiment shifting Cen ter Gravity models Use lead fish weights Any sporting store has fish weights sizes increments ounce ounces Dont forget check wing stabilizer wash-in wash out Armed new knowledge can honestly say ready go flying. see next month Note 1 Center Gravity thing physicists call resultant examJuly1979 111 r
Edition: Model Aviation - 1979/07
Page Numbers: 28, 111
WINTER finally over everyone getting ready start racing again either dusting off last years favorite plane building shiny new fact some parts South West several contests have already run year should better last year racing Lets try help get new flier involved 1979 Take guy seems little interested next contest Show him everything works contest scored tell him like compete Sure takes time good info can explained car van way contest holding contest invite friend come help flag time score another good way help guys get involved Pylon Racing never dull always excitement has get mildly involved get bitten bug racing event almost everyone interested Club 500 Sport Quarter Midget Formula find out action summer turn competition schedule section magazine will tell contests area well what events will run want start out Formula two classes areas country Standard Expert two classes generally flown together Standard class set up beginner area winners both classes end race separate Standard class Expert highest finishing Standard class winner could beat Expert flier would win Standard flier advan ces Expert consistently turns times mid-twenties may declare himself Expert time Once Expert class rest year area have formed Ohio Pylon Racing Association Almost fliers belong group best help new flier promoting racing may have group club area set up same reasons end season Championship Race held top fliers country Formula race open members NMPRA have qualify must finish top 20% NMPRA district finish top 10 AMA Nationals officer NMPRA order qualify Formula Championship Race NMPRA Championship big Formula fliers com pete year qualify held end Octoberusually South West have good chance decent weather Everyone looks forward race year NMPRA also holds Quarter Mid get Championship September year Rough River KY beautiful area event open NMPRA members compete Quarter Midget NMPRA Championship Trophies awarded both Quarter Midget Formula Championships also big contest May held Bakersfield CA year race has become very popular attracting guys over world compete great racing over country can always use contests competitors larger race better competition first contests season held March 1718 1979 Western District rained off entire weekend still good Formula contest Gary Hover won Expert class best time being 1187 Dave Shadel third Expert fastest time 1163 Leonard Walker tops Standard division also fastest time Standards 1291 way Standard Expert classes flown together race Gary McPike CD Quarter Midget racing began January Continued r. 111 28 Model Aviation Pilots have 90 seconds start engines ana Tind tune last rpm necaic vaive setting One-half father-son team ready start /4-midget race Dave Mar-tin watches flagman HOBBYPOXY FORMULA 3 THIXOTROPIC EPOXY GLUE NO SAGS. NORIJNS. NO DR PS. Formula 3 specially formulated gel-like viscosity allowing applied vertical surfaces thin edges other problem areas other glues just run off makes Formula 3 perfect planking building up reinforcing fillets joints sealing cracks filling holes joining poorly fitted badly die-crushed parts . hundred other things youve always wished kind glue now its made Hobbypoxy leader epoxy glues model building Formula 3 packaged two four-ounce cans has working time hour cures hard overnight mmmiv minuws L Division Pettit Paint co Inc 36 Pine Street Rockaway NJ 07866 RC Pylon/Hager continued page 28 28 West Coast race held Mile Square Park Fountain Valley CA hosted QMRC Vince Stag naro CD 17 fliers braved cold winds rain hail snow yes snow southern California sounds like Ohio Due weather four rounds flown Tom Christopher Bob Novak tied lead Tom took prize since fast time 1395 want keep readers informed what going racing throughout country Send us contest reports anything else would like share readers Bill Hager 5200 Rye Dr Dayton OH 45424 AMA Free Flight/Prey continued page 37 vertical fin makes excellent tab instead cutting fin Different thicknesses balsa wood can glued trailing edge stock increase turn wood can shaved off trailing edge stock decrease turn tab used turn adjustment no specific location shown plans locate tab near base trailing edge vertical fin Locating tab near top vertical fin will tend cause rolling effect around Longitu dinal axis well turn thereby achieve desired results 2 Right-or-left engine thrust Right- left-thrust viewed top angle formed line drawn lengthwise through center crankshaft measured either right left center line fuselage Cocking engine thrust line off center will cause model turn direction engine thrust line Engine thrust offset effective low speeds speed increased thrust offset becomes less effective rea son thrust offset used primarily control initial part climb vertical fin rudder tab offset used control remainder power climb Finally model must have stability Without stability around axis rota tion doomed self destruction Stability ability model resist changes normal flight also ability upset outside force such gust wind recover return normal flight designer model determined certain stability factors such dihedral angle size stabilizer vertical fin too must decide certain stability factors such angles incidence wing stabilizer amount rudder-tab offset engine-thrust offset etc have vital role eventual stability model about ready go flying well just Part Two Meanwhile spare moments become familiar checking decalage models using bubble protractor spirit level Use spirit level establish reference line convenience zero degrees bubble protractor measure angle incidence wing stabilizer angular difference tween decalage same measure down thrust Also experiment different thicknesses wood see much takes change angle incidence degree wing stabilizer dont have bubble protractor Sears has several inex pensive types available retail cata logue order example Angle Finder #93987 retails Los Angeles $399 Protractor Level #9-3990 retails $289 Either style excellent model use Also check hardware stores precision style bubble protractor dont overlook Army Surplus stores obsolete propeller blade angle protractor Lastly experiment shifting Cen ter Gravity models Use lead fish weights Any sporting store has fish weights sizes increments ounce ounces Dont forget check wing stabilizer wash-in wash out Armed new knowledge can honestly say ready go flying. see next month Note 1 Center Gravity thing physicists call resultant examJuly1979 111 r