ho needs pitch what pitch gauge Indeed gauge Would use pitch gauge umpire game slow-pitch softball gauge something music teacher uses tell song pitch pitch gauge interest aeromodelers tool softball music rather tool used measure pitch propeller Propeller pitch forward travel inches propeller during revolution propeller acted like section bolt being screwed nut ie slippage uniform pitch pitch should same locations along propeller blade So whats big deal concern over propeller pitch just use pitch change adjust ffight speedright Besides pitch wrong what can thought youd never ask pitch propeller can have strong effect takeoff thrust actual pitch may different marked propeller change prop pitch can used set level flight speed adjust landing speed engine idle make flight speeds constant through vertical maneuvers thoughts correct complete doing experiments Electric power discovered some information about propeller pitch new facts may important flier wet Electric First some propellers pitch has strong effect static thrust thrust available takeoff particularly important someone like myself flies Electricpowered models higher elevations example Zinger Master Airscrew propellers show strong variation thrust pitch APC propellers Master Airscrew Electric propellers show very slight variation thrust pitch See comparison 11-inch propellers shown Table 1 Figure 1 Note thrust values measured 4740-foot elevation anomaly actual pitch APC 11 x 7 11 x 8 propellers 0 0 cannot explain pitch values propellers personal stock reversed 11 x 7 has larger measured pitch 11 x 8 Perhaps propellers older production run newer ones measured hobby shop described Table 3 arent reversed still close same value pitch thrust values shown Table 1 Figure 1 would approximately 15% greater same rpm sea-level elevation Table 2 summarizes measured thrust per inch pitch change propeller type Note Zinger Master Airscrew Sport propellers show strongest thrust increase inch pitch increase values would also 15% greater sea level Another important point remember pitch value stamped propeller may always correct manufacturing process always perfect example measured pitch three 11 x 7 propellers three 11 x 8 propellers same manufacturer found average pitch over outer half propeller blades 78 81 inches respectively sets supposed have one-inch difference measurements showed difference 03 inches Going 11 x 7 11 x 8 style propeller would give 68 Model Aviation What props pitchreally U DON BROOKS Variation Thrust Pitch 6300 rpm erent Propeller Types 11-in Diameter POP64d 71~6 APC 11x625962 11x727581 11x826375 11x926386 Master Airscrew Electric 11 x732572 11 x933290 Master Airscrew Black SDOrt glass-filled 11x621651 11x726269 11x7525267 11x928375 Top Flite Power Point 11 x618156 11 x720667 lix 1023693 Zinger 11xS54 11x653 11x770 11x879 227 18.3 258 287 t7ES 1 props sanded far proper weight balance pitch may have changed slightly 2 Elevation measurements taken 4740 feet 3 For props given pitch diameter operating same rpm having smaller thrust may also reauire smaller toraue turn Tornue WRR menured theec evneriment Average Measureu PropeIler Types APC Props 11 x6 11 x7 11 x8 Grauoner Proos 10x6 Master Airscrew Black Sport ProDs lOx 16 lix 17 Master Airscrew Wood Props lOx 16 Top Flite Power Point Props lix 17 Zinger ProDs lOx 16 11 x75W 11 x8 Different Average pitch 60 62 & 61 inches Average pitch 79 79 & 77 inches Average pitch 81 82 & 81 inches Average pitch 61 & 61 inches 2 new Average pitch 54 56 & 56 inches Average pitch 68 68 & 68 inches Average pitch 57 59 & 60 inches Average pitch 68 & 64 inches 2 new Average pitch 62 63 & 59 inches Average pitch 72 & 76 inches 2 new Average pitch 79 80 & 84 inches ltO7ES 1 props off shelf unsanded 2 Pitch measurements made follows a Four mess made blade locations 44 5973 & 88% radius measured shaft centerline measurements evenly spaced possible Prather pitch gauge Stations 579 & 11 usedO394 apart unique gauge arent directly related prop radius b No measurements within 112 inch tip c The average pitch listed table grand average nil inh nfea Imnionfe Pack kit contains gearbox 72 volt 05 motor folding prop spinner great efficiency over direct drive gearbox 25 30 351 ratio super value $39 95 suggested retail Vented Motor Mount 05 motors easy install $459 suggested retail Gearboxes longer flight times greater climb compact lightweight design $1895 suggested retail ratios 25 30 351 electric motors U Electric Wood Series electric motors beechwood undercambered blades Best performance electric 8 sizes 10x6 through 13x10 you the expected speed adjustment Also note comparing performance style propeller another actual pitch may have significant effect thrust produced valid comparison actual pitch propellers being compared must same measurements sampling six different types propellers shown Table 3 pitch values shown Tables 1 3 averages pitch measurements made over both blades 44 59 73 88% radius propeller blade measured shaft centerline locations convenient gauge using measurements could made pitch gauge using formula below method described W F McCombs book Making Scale Model Airplanes Fly Mr McCombs method uses thin wedges cut specific angles placed under prop measure angle between back side prop plane rotation 70 75% radius Pitch inches tanA R distance out hub center station angle between blade plane rotation Determining pitch much easier propeller-pitch gauge can measure propeller pitch determine want use discard propeller propeller pitch want select another prop 03 inches pitch difference between blades prop discard prop avoid unwanted vibration used Prather pitch gauge make propeller pitch measurements shown Tables 1 3 gauge simple use especially have help see photograph pitch-gauge platform has slots milled across its width different distances stations measuring arm propeller mounted gauge HIGHEST QUALITY TOP PERFORMANCE COMPETITiW PRICES ALL ENGINES INCLUDE Sachs Doimar cylinder crankshaft Assembiies OH Electronics heavy duty ignition system Bosch piug cover 1 year imited warranty parts labor Tiiioston inlector carburetor ier Tapped smoke Waibro carburetor ran end reedy tiy OPTIONAL EQUIPMENT Singie bolt prop adapter HouRs5 & H S12OO 5pm- Opm Mon-FriPrices Subject lOam4pmto change Sat & Sunwtthout notIce central stdTtme-114 QE AVENUE J u --- EXCELSI SPGS MO 84024 QUALITY BUILT GIANT SCALE ENGINES816 830-5140 ENGINES SSORIES ICEFAX 816 8373890 RC Flight Training Beginner advanced tailored individual long-time modeler full size airplane flight instruc tor will male progress fun easy during week stay beautiful far western North Carolina Write call information BC Flight Training 7043894968 70 Model Aviation tric Flight free catalog send self-addressed stamped envelope Windsor Propeller Company 3219 Monier Circle Rancho Cordova CA 95742 Now can use electric starter anywhere ultimate cordless convenience built-in 12V 12Ah lead-acid battery attaches electric starter eliminate clumsy power cords Dependable unit provides clutter-free starts tor 2-stroke 4-stroke engines Case made ot tuelproof tiber-reintorced plastic tor c Adlustable mounts can accommodate almost starter Built-in charge jack power terminals offer recharging options Charges overnight using standard AC wall charger location dealer nearest please call 1 -800-682-8948 mention code #047C HOBBkQ COopyright 19953074174 1996 AMA AT6 OFFICIAL LUBRICANT rnQdLLIBE designed gas engine powered scale aircraft helicopters boats cars trucks Klotz ModeLUBE Clean BurnTM technology improves throttle response acceleration Exceptional film strength protects engines high RPM extreme heat competition applications Run leader. KLQTZ Call free catalog RACER TECHI/NE 219-749-0489 TOLL FREE ORDERLINE 800-242-0489 SPEC/AL F68/ WI/LA PiS0L5I/CTS Ill/C P0 BOX1/348FORTWAYA/E 1/1/48857 72 Model Aviation p clamp slides slots back side propeller can lined up against measuring arm pitch can read scale position station found accurate measurements light positioned behind gauge helpful As close gap between propeller measuring arm light visible edge propellerif slight gap between edge propeller measuring arm edge gap will show light have purchased propellers have ever wondered what actual pitch could make propeller performance comparisons Would like able determine pitch propellers help obtain consistent flying results might consider using McCombs method getting access propeller pitch gauge measure actual prop pitch Knowing actual prop pitch can put back pitch control ces products mentioned article APC propellers Landing Products Box 938 Knights Landing CA 95645 Graupner propellers Hobby Lobby International Inc 5614 Franklin Pike Circle Brentwood TN 37027 Making Scale Model Airplanes Fly WF McCombs Aircraft Data Box 763576 Dallas TX 75224 Prather pitch gauge Prather Products Inc 1660 Ravenna Ave Wilmington CA 90744 Top Flite props Great Planes Model Distributors Co Box 9021 Champaign IL 61826-9021 Master Airscrew props Windsor Propeller Co 384 Tesconi Court Santa Rosa CA 95401 Zinger props J&Z Products 25029 South Vermont Ave Harbor City CA 90710 V v4 iI/ JXe jVw Super Stand Wino Control Wing stable supported Adjust size plane Handy tray small parts Fast easy assembly Money back guarantee order call 1-800-254-6553 Mon thru Fri 9 5 pacific time Sat & Sun 11 5 pacific time JBM Products 13314 Mission Tierra Way Granada Hills CA 91344 Eagle aviation 513 435-9232 6042 No D ye West Carrollton Ohio 45449
Edition: Model Aviation - 1996/07
Page Numbers: 68, 69, 70, 72
ho needs pitch what pitch gauge Indeed gauge Would use pitch gauge umpire game slow-pitch softball gauge something music teacher uses tell song pitch pitch gauge interest aeromodelers tool softball music rather tool used measure pitch propeller Propeller pitch forward travel inches propeller during revolution propeller acted like section bolt being screwed nut ie slippage uniform pitch pitch should same locations along propeller blade So whats big deal concern over propeller pitch just use pitch change adjust ffight speedright Besides pitch wrong what can thought youd never ask pitch propeller can have strong effect takeoff thrust actual pitch may different marked propeller change prop pitch can used set level flight speed adjust landing speed engine idle make flight speeds constant through vertical maneuvers thoughts correct complete doing experiments Electric power discovered some information about propeller pitch new facts may important flier wet Electric First some propellers pitch has strong effect static thrust thrust available takeoff particularly important someone like myself flies Electricpowered models higher elevations example Zinger Master Airscrew propellers show strong variation thrust pitch APC propellers Master Airscrew Electric propellers show very slight variation thrust pitch See comparison 11-inch propellers shown Table 1 Figure 1 Note thrust values measured 4740-foot elevation anomaly actual pitch APC 11 x 7 11 x 8 propellers 0 0 cannot explain pitch values propellers personal stock reversed 11 x 7 has larger measured pitch 11 x 8 Perhaps propellers older production run newer ones measured hobby shop described Table 3 arent reversed still close same value pitch thrust values shown Table 1 Figure 1 would approximately 15% greater same rpm sea-level elevation Table 2 summarizes measured thrust per inch pitch change propeller type Note Zinger Master Airscrew Sport propellers show strongest thrust increase inch pitch increase values would also 15% greater sea level Another important point remember pitch value stamped propeller may always correct manufacturing process always perfect example measured pitch three 11 x 7 propellers three 11 x 8 propellers same manufacturer found average pitch over outer half propeller blades 78 81 inches respectively sets supposed have one-inch difference measurements showed difference 03 inches Going 11 x 7 11 x 8 style propeller would give 68 Model Aviation What props pitchreally U DON BROOKS Variation Thrust Pitch 6300 rpm erent Propeller Types 11-in Diameter POP64d 71~6 APC 11x625962 11x727581 11x826375 11x926386 Master Airscrew Electric 11 x732572 11 x933290 Master Airscrew Black SDOrt glass-filled 11x621651 11x726269 11x7525267 11x928375 Top Flite Power Point 11 x618156 11 x720667 lix 1023693 Zinger 11xS54 11x653 11x770 11x879 227 18.3 258 287 t7ES 1 props sanded far proper weight balance pitch may have changed slightly 2 Elevation measurements taken 4740 feet 3 For props given pitch diameter operating same rpm having smaller thrust may also reauire smaller toraue turn Tornue WRR menured theec evneriment Average Measureu PropeIler Types APC Props 11 x6 11 x7 11 x8 Grauoner Proos 10x6 Master Airscrew Black Sport ProDs lOx 16 lix 17 Master Airscrew Wood Props lOx 16 Top Flite Power Point Props lix 17 Zinger ProDs lOx 16 11 x75W 11 x8 Different Average pitch 60 62 & 61 inches Average pitch 79 79 & 77 inches Average pitch 81 82 & 81 inches Average pitch 61 & 61 inches 2 new Average pitch 54 56 & 56 inches Average pitch 68 68 & 68 inches Average pitch 57 59 & 60 inches Average pitch 68 & 64 inches 2 new Average pitch 62 63 & 59 inches Average pitch 72 & 76 inches 2 new Average pitch 79 80 & 84 inches ltO7ES 1 props off shelf unsanded 2 Pitch measurements made follows a Four mess made blade locations 44 5973 & 88% radius measured shaft centerline measurements evenly spaced possible Prather pitch gauge Stations 579 & 11 usedO394 apart unique gauge arent directly related prop radius b No measurements within 112 inch tip c The average pitch listed table grand average nil inh nfea Imnionfe Pack kit contains gearbox 72 volt 05 motor folding prop spinner great efficiency over direct drive gearbox 25 30 351 ratio super value $39 95 suggested retail Vented Motor Mount 05 motors easy install $459 suggested retail Gearboxes longer flight times greater climb compact lightweight design $1895 suggested retail ratios 25 30 351 electric motors U Electric Wood Series electric motors beechwood undercambered blades Best performance electric 8 sizes 10x6 through 13x10 you the expected speed adjustment Also note comparing performance style propeller another actual pitch may have significant effect thrust produced valid comparison actual pitch propellers being compared must same measurements sampling six different types propellers shown Table 3 pitch values shown Tables 1 3 averages pitch measurements made over both blades 44 59 73 88% radius propeller blade measured shaft centerline locations convenient gauge using measurements could made pitch gauge using formula below method described W F McCombs book Making Scale Model Airplanes Fly Mr McCombs method uses thin wedges cut specific angles placed under prop measure angle between back side prop plane rotation 70 75% radius Pitch inches tanA R distance out hub center station angle between blade plane rotation Determining pitch much easier propeller-pitch gauge can measure propeller pitch determine want use discard propeller propeller pitch want select another prop 03 inches pitch difference between blades prop discard prop avoid unwanted vibration used Prather pitch gauge make propeller pitch measurements shown Tables 1 3 gauge simple use especially have help see photograph pitch-gauge platform has slots milled across its width different distances stations measuring arm propeller mounted gauge HIGHEST QUALITY TOP PERFORMANCE COMPETITiW PRICES ALL ENGINES INCLUDE Sachs Doimar cylinder crankshaft Assembiies OH Electronics heavy duty ignition system Bosch piug cover 1 year imited warranty parts labor Tiiioston inlector carburetor ier Tapped smoke Waibro carburetor ran end reedy tiy OPTIONAL EQUIPMENT Singie bolt prop adapter HouRs5 & H S12OO 5pm- Opm Mon-FriPrices Subject lOam4pmto change Sat & Sunwtthout notIce central stdTtme-114 QE AVENUE J u --- EXCELSI SPGS MO 84024 QUALITY BUILT GIANT SCALE ENGINES816 830-5140 ENGINES SSORIES ICEFAX 816 8373890 RC Flight Training Beginner advanced tailored individual long-time modeler full size airplane flight instruc tor will male progress fun easy during week stay beautiful far western North Carolina Write call information BC Flight Training 7043894968 70 Model Aviation tric Flight free catalog send self-addressed stamped envelope Windsor Propeller Company 3219 Monier Circle Rancho Cordova CA 95742 Now can use electric starter anywhere ultimate cordless convenience built-in 12V 12Ah lead-acid battery attaches electric starter eliminate clumsy power cords Dependable unit provides clutter-free starts tor 2-stroke 4-stroke engines Case made ot tuelproof tiber-reintorced plastic tor c Adlustable mounts can accommodate almost starter Built-in charge jack power terminals offer recharging options Charges overnight using standard AC wall charger location dealer nearest please call 1 -800-682-8948 mention code #047C HOBBkQ COopyright 19953074174 1996 AMA AT6 OFFICIAL LUBRICANT rnQdLLIBE designed gas engine powered scale aircraft helicopters boats cars trucks Klotz ModeLUBE Clean BurnTM technology improves throttle response acceleration Exceptional film strength protects engines high RPM extreme heat competition applications Run leader. KLQTZ Call free catalog RACER TECHI/NE 219-749-0489 TOLL FREE ORDERLINE 800-242-0489 SPEC/AL F68/ WI/LA PiS0L5I/CTS Ill/C P0 BOX1/348FORTWAYA/E 1/1/48857 72 Model Aviation p clamp slides slots back side propeller can lined up against measuring arm pitch can read scale position station found accurate measurements light positioned behind gauge helpful As close gap between propeller measuring arm light visible edge propellerif slight gap between edge propeller measuring arm edge gap will show light have purchased propellers have ever wondered what actual pitch could make propeller performance comparisons Would like able determine pitch propellers help obtain consistent flying results might consider using McCombs method getting access propeller pitch gauge measure actual prop pitch Knowing actual prop pitch can put back pitch control ces products mentioned article APC propellers Landing Products Box 938 Knights Landing CA 95645 Graupner propellers Hobby Lobby International Inc 5614 Franklin Pike Circle Brentwood TN 37027 Making Scale Model Airplanes Fly WF McCombs Aircraft Data Box 763576 Dallas TX 75224 Prather pitch gauge Prather Products Inc 1660 Ravenna Ave Wilmington CA 90744 Top Flite props Great Planes Model Distributors Co Box 9021 Champaign IL 61826-9021 Master Airscrew props Windsor Propeller Co 384 Tesconi Court Santa Rosa CA 95401 Zinger props J&Z Products 25029 South Vermont Ave Harbor City CA 90710 V v4 iI/ JXe jVw Super Stand Wino Control Wing stable supported Adjust size plane Handy tray small parts Fast easy assembly Money back guarantee order call 1-800-254-6553 Mon thru Fri 9 5 pacific time Sat & Sun 11 5 pacific time JBM Products 13314 Mission Tierra Way Granada Hills CA 91344 Eagle aviation 513 435-9232 6042 No D ye West Carrollton Ohio 45449
Edition: Model Aviation - 1996/07
Page Numbers: 68, 69, 70, 72
ho needs pitch what pitch gauge Indeed gauge Would use pitch gauge umpire game slow-pitch softball gauge something music teacher uses tell song pitch pitch gauge interest aeromodelers tool softball music rather tool used measure pitch propeller Propeller pitch forward travel inches propeller during revolution propeller acted like section bolt being screwed nut ie slippage uniform pitch pitch should same locations along propeller blade So whats big deal concern over propeller pitch just use pitch change adjust ffight speedright Besides pitch wrong what can thought youd never ask pitch propeller can have strong effect takeoff thrust actual pitch may different marked propeller change prop pitch can used set level flight speed adjust landing speed engine idle make flight speeds constant through vertical maneuvers thoughts correct complete doing experiments Electric power discovered some information about propeller pitch new facts may important flier wet Electric First some propellers pitch has strong effect static thrust thrust available takeoff particularly important someone like myself flies Electricpowered models higher elevations example Zinger Master Airscrew propellers show strong variation thrust pitch APC propellers Master Airscrew Electric propellers show very slight variation thrust pitch See comparison 11-inch propellers shown Table 1 Figure 1 Note thrust values measured 4740-foot elevation anomaly actual pitch APC 11 x 7 11 x 8 propellers 0 0 cannot explain pitch values propellers personal stock reversed 11 x 7 has larger measured pitch 11 x 8 Perhaps propellers older production run newer ones measured hobby shop described Table 3 arent reversed still close same value pitch thrust values shown Table 1 Figure 1 would approximately 15% greater same rpm sea-level elevation Table 2 summarizes measured thrust per inch pitch change propeller type Note Zinger Master Airscrew Sport propellers show strongest thrust increase inch pitch increase values would also 15% greater sea level Another important point remember pitch value stamped propeller may always correct manufacturing process always perfect example measured pitch three 11 x 7 propellers three 11 x 8 propellers same manufacturer found average pitch over outer half propeller blades 78 81 inches respectively sets supposed have one-inch difference measurements showed difference 03 inches Going 11 x 7 11 x 8 style propeller would give 68 Model Aviation What props pitchreally U DON BROOKS Variation Thrust Pitch 6300 rpm erent Propeller Types 11-in Diameter POP64d 71~6 APC 11x625962 11x727581 11x826375 11x926386 Master Airscrew Electric 11 x732572 11 x933290 Master Airscrew Black SDOrt glass-filled 11x621651 11x726269 11x7525267 11x928375 Top Flite Power Point 11 x618156 11 x720667 lix 1023693 Zinger 11xS54 11x653 11x770 11x879 227 18.3 258 287 t7ES 1 props sanded far proper weight balance pitch may have changed slightly 2 Elevation measurements taken 4740 feet 3 For props given pitch diameter operating same rpm having smaller thrust may also reauire smaller toraue turn Tornue WRR menured theec evneriment Average Measureu PropeIler Types APC Props 11 x6 11 x7 11 x8 Grauoner Proos 10x6 Master Airscrew Black Sport ProDs lOx 16 lix 17 Master Airscrew Wood Props lOx 16 Top Flite Power Point Props lix 17 Zinger ProDs lOx 16 11 x75W 11 x8 Different Average pitch 60 62 & 61 inches Average pitch 79 79 & 77 inches Average pitch 81 82 & 81 inches Average pitch 61 & 61 inches 2 new Average pitch 54 56 & 56 inches Average pitch 68 68 & 68 inches Average pitch 57 59 & 60 inches Average pitch 68 & 64 inches 2 new Average pitch 62 63 & 59 inches Average pitch 72 & 76 inches 2 new Average pitch 79 80 & 84 inches ltO7ES 1 props off shelf unsanded 2 Pitch measurements made follows a Four mess made blade locations 44 5973 & 88% radius measured shaft centerline measurements evenly spaced possible Prather pitch gauge Stations 579 & 11 usedO394 apart unique gauge arent directly related prop radius b No measurements within 112 inch tip c The average pitch listed table grand average nil inh nfea Imnionfe Pack kit contains gearbox 72 volt 05 motor folding prop spinner great efficiency over direct drive gearbox 25 30 351 ratio super value $39 95 suggested retail Vented Motor Mount 05 motors easy install $459 suggested retail Gearboxes longer flight times greater climb compact lightweight design $1895 suggested retail ratios 25 30 351 electric motors U Electric Wood Series electric motors beechwood undercambered blades Best performance electric 8 sizes 10x6 through 13x10 you the expected speed adjustment Also note comparing performance style propeller another actual pitch may have significant effect thrust produced valid comparison actual pitch propellers being compared must same measurements sampling six different types propellers shown Table 3 pitch values shown Tables 1 3 averages pitch measurements made over both blades 44 59 73 88% radius propeller blade measured shaft centerline locations convenient gauge using measurements could made pitch gauge using formula below method described W F McCombs book Making Scale Model Airplanes Fly Mr McCombs method uses thin wedges cut specific angles placed under prop measure angle between back side prop plane rotation 70 75% radius Pitch inches tanA R distance out hub center station angle between blade plane rotation Determining pitch much easier propeller-pitch gauge can measure propeller pitch determine want use discard propeller propeller pitch want select another prop 03 inches pitch difference between blades prop discard prop avoid unwanted vibration used Prather pitch gauge make propeller pitch measurements shown Tables 1 3 gauge simple use especially have help see photograph pitch-gauge platform has slots milled across its width different distances stations measuring arm propeller mounted gauge HIGHEST QUALITY TOP PERFORMANCE COMPETITiW PRICES ALL ENGINES INCLUDE Sachs Doimar cylinder crankshaft Assembiies OH Electronics heavy duty ignition system Bosch piug cover 1 year imited warranty parts labor Tiiioston inlector carburetor ier Tapped smoke Waibro carburetor ran end reedy tiy OPTIONAL EQUIPMENT Singie bolt prop adapter HouRs5 & H S12OO 5pm- Opm Mon-FriPrices Subject lOam4pmto change Sat & Sunwtthout notIce central stdTtme-114 QE AVENUE J u --- EXCELSI SPGS MO 84024 QUALITY BUILT GIANT SCALE ENGINES816 830-5140 ENGINES SSORIES ICEFAX 816 8373890 RC Flight Training Beginner advanced tailored individual long-time modeler full size airplane flight instruc tor will male progress fun easy during week stay beautiful far western North Carolina Write call information BC Flight Training 7043894968 70 Model Aviation tric Flight free catalog send self-addressed stamped envelope Windsor Propeller Company 3219 Monier Circle Rancho Cordova CA 95742 Now can use electric starter anywhere ultimate cordless convenience built-in 12V 12Ah lead-acid battery attaches electric starter eliminate clumsy power cords Dependable unit provides clutter-free starts tor 2-stroke 4-stroke engines Case made ot tuelproof tiber-reintorced plastic tor c Adlustable mounts can accommodate almost starter Built-in charge jack power terminals offer recharging options Charges overnight using standard AC wall charger location dealer nearest please call 1 -800-682-8948 mention code #047C HOBBkQ COopyright 19953074174 1996 AMA AT6 OFFICIAL LUBRICANT rnQdLLIBE designed gas engine powered scale aircraft helicopters boats cars trucks Klotz ModeLUBE Clean BurnTM technology improves throttle response acceleration Exceptional film strength protects engines high RPM extreme heat competition applications Run leader. KLQTZ Call free catalog RACER TECHI/NE 219-749-0489 TOLL FREE ORDERLINE 800-242-0489 SPEC/AL F68/ WI/LA PiS0L5I/CTS Ill/C P0 BOX1/348FORTWAYA/E 1/1/48857 72 Model Aviation p clamp slides slots back side propeller can lined up against measuring arm pitch can read scale position station found accurate measurements light positioned behind gauge helpful As close gap between propeller measuring arm light visible edge propellerif slight gap between edge propeller measuring arm edge gap will show light have purchased propellers have ever wondered what actual pitch could make propeller performance comparisons Would like able determine pitch propellers help obtain consistent flying results might consider using McCombs method getting access propeller pitch gauge measure actual prop pitch Knowing actual prop pitch can put back pitch control ces products mentioned article APC propellers Landing Products Box 938 Knights Landing CA 95645 Graupner propellers Hobby Lobby International Inc 5614 Franklin Pike Circle Brentwood TN 37027 Making Scale Model Airplanes Fly WF McCombs Aircraft Data Box 763576 Dallas TX 75224 Prather pitch gauge Prather Products Inc 1660 Ravenna Ave Wilmington CA 90744 Top Flite props Great Planes Model Distributors Co Box 9021 Champaign IL 61826-9021 Master Airscrew props Windsor Propeller Co 384 Tesconi Court Santa Rosa CA 95401 Zinger props J&Z Products 25029 South Vermont Ave Harbor City CA 90710 V v4 iI/ JXe jVw Super Stand Wino Control Wing stable supported Adjust size plane Handy tray small parts Fast easy assembly Money back guarantee order call 1-800-254-6553 Mon thru Fri 9 5 pacific time Sat & Sun 11 5 pacific time JBM Products 13314 Mission Tierra Way Granada Hills CA 91344 Eagle aviation 513 435-9232 6042 No D ye West Carrollton Ohio 45449
Edition: Model Aviation - 1996/07
Page Numbers: 68, 69, 70, 72
ho needs pitch what pitch gauge Indeed gauge Would use pitch gauge umpire game slow-pitch softball gauge something music teacher uses tell song pitch pitch gauge interest aeromodelers tool softball music rather tool used measure pitch propeller Propeller pitch forward travel inches propeller during revolution propeller acted like section bolt being screwed nut ie slippage uniform pitch pitch should same locations along propeller blade So whats big deal concern over propeller pitch just use pitch change adjust ffight speedright Besides pitch wrong what can thought youd never ask pitch propeller can have strong effect takeoff thrust actual pitch may different marked propeller change prop pitch can used set level flight speed adjust landing speed engine idle make flight speeds constant through vertical maneuvers thoughts correct complete doing experiments Electric power discovered some information about propeller pitch new facts may important flier wet Electric First some propellers pitch has strong effect static thrust thrust available takeoff particularly important someone like myself flies Electricpowered models higher elevations example Zinger Master Airscrew propellers show strong variation thrust pitch APC propellers Master Airscrew Electric propellers show very slight variation thrust pitch See comparison 11-inch propellers shown Table 1 Figure 1 Note thrust values measured 4740-foot elevation anomaly actual pitch APC 11 x 7 11 x 8 propellers 0 0 cannot explain pitch values propellers personal stock reversed 11 x 7 has larger measured pitch 11 x 8 Perhaps propellers older production run newer ones measured hobby shop described Table 3 arent reversed still close same value pitch thrust values shown Table 1 Figure 1 would approximately 15% greater same rpm sea-level elevation Table 2 summarizes measured thrust per inch pitch change propeller type Note Zinger Master Airscrew Sport propellers show strongest thrust increase inch pitch increase values would also 15% greater sea level Another important point remember pitch value stamped propeller may always correct manufacturing process always perfect example measured pitch three 11 x 7 propellers three 11 x 8 propellers same manufacturer found average pitch over outer half propeller blades 78 81 inches respectively sets supposed have one-inch difference measurements showed difference 03 inches Going 11 x 7 11 x 8 style propeller would give 68 Model Aviation What props pitchreally U DON BROOKS Variation Thrust Pitch 6300 rpm erent Propeller Types 11-in Diameter POP64d 71~6 APC 11x625962 11x727581 11x826375 11x926386 Master Airscrew Electric 11 x732572 11 x933290 Master Airscrew Black SDOrt glass-filled 11x621651 11x726269 11x7525267 11x928375 Top Flite Power Point 11 x618156 11 x720667 lix 1023693 Zinger 11xS54 11x653 11x770 11x879 227 18.3 258 287 t7ES 1 props sanded far proper weight balance pitch may have changed slightly 2 Elevation measurements taken 4740 feet 3 For props given pitch diameter operating same rpm having smaller thrust may also reauire smaller toraue turn Tornue WRR menured theec evneriment Average Measureu PropeIler Types APC Props 11 x6 11 x7 11 x8 Grauoner Proos 10x6 Master Airscrew Black Sport ProDs lOx 16 lix 17 Master Airscrew Wood Props lOx 16 Top Flite Power Point Props lix 17 Zinger ProDs lOx 16 11 x75W 11 x8 Different Average pitch 60 62 & 61 inches Average pitch 79 79 & 77 inches Average pitch 81 82 & 81 inches Average pitch 61 & 61 inches 2 new Average pitch 54 56 & 56 inches Average pitch 68 68 & 68 inches Average pitch 57 59 & 60 inches Average pitch 68 & 64 inches 2 new Average pitch 62 63 & 59 inches Average pitch 72 & 76 inches 2 new Average pitch 79 80 & 84 inches ltO7ES 1 props off shelf unsanded 2 Pitch measurements made follows a Four mess made blade locations 44 5973 & 88% radius measured shaft centerline measurements evenly spaced possible Prather pitch gauge Stations 579 & 11 usedO394 apart unique gauge arent directly related prop radius b No measurements within 112 inch tip c The average pitch listed table grand average nil inh nfea Imnionfe Pack kit contains gearbox 72 volt 05 motor folding prop spinner great efficiency over direct drive gearbox 25 30 351 ratio super value $39 95 suggested retail Vented Motor Mount 05 motors easy install $459 suggested retail Gearboxes longer flight times greater climb compact lightweight design $1895 suggested retail ratios 25 30 351 electric motors U Electric Wood Series electric motors beechwood undercambered blades Best performance electric 8 sizes 10x6 through 13x10 you the expected speed adjustment Also note comparing performance style propeller another actual pitch may have significant effect thrust produced valid comparison actual pitch propellers being compared must same measurements sampling six different types propellers shown Table 3 pitch values shown Tables 1 3 averages pitch measurements made over both blades 44 59 73 88% radius propeller blade measured shaft centerline locations convenient gauge using measurements could made pitch gauge using formula below method described W F McCombs book Making Scale Model Airplanes Fly Mr McCombs method uses thin wedges cut specific angles placed under prop measure angle between back side prop plane rotation 70 75% radius Pitch inches tanA R distance out hub center station angle between blade plane rotation Determining pitch much easier propeller-pitch gauge can measure propeller pitch determine want use discard propeller propeller pitch want select another prop 03 inches pitch difference between blades prop discard prop avoid unwanted vibration used Prather pitch gauge make propeller pitch measurements shown Tables 1 3 gauge simple use especially have help see photograph pitch-gauge platform has slots milled across its width different distances stations measuring arm propeller mounted gauge HIGHEST QUALITY TOP PERFORMANCE COMPETITiW PRICES ALL ENGINES INCLUDE Sachs Doimar cylinder crankshaft Assembiies OH Electronics heavy duty ignition system Bosch piug cover 1 year imited warranty parts labor Tiiioston inlector carburetor ier Tapped smoke Waibro carburetor ran end reedy tiy OPTIONAL EQUIPMENT Singie bolt prop adapter HouRs5 & H S12OO 5pm- Opm Mon-FriPrices Subject lOam4pmto change Sat & Sunwtthout notIce central stdTtme-114 QE AVENUE J u --- EXCELSI SPGS MO 84024 QUALITY BUILT GIANT SCALE ENGINES816 830-5140 ENGINES SSORIES ICEFAX 816 8373890 RC Flight Training Beginner advanced tailored individual long-time modeler full size airplane flight instruc tor will male progress fun easy during week stay beautiful far western North Carolina Write call information BC Flight Training 7043894968 70 Model Aviation tric Flight free catalog send self-addressed stamped envelope Windsor Propeller Company 3219 Monier Circle Rancho Cordova CA 95742 Now can use electric starter anywhere ultimate cordless convenience built-in 12V 12Ah lead-acid battery attaches electric starter eliminate clumsy power cords Dependable unit provides clutter-free starts tor 2-stroke 4-stroke engines Case made ot tuelproof tiber-reintorced plastic tor c Adlustable mounts can accommodate almost starter Built-in charge jack power terminals offer recharging options Charges overnight using standard AC wall charger location dealer nearest please call 1 -800-682-8948 mention code #047C HOBBkQ COopyright 19953074174 1996 AMA AT6 OFFICIAL LUBRICANT rnQdLLIBE designed gas engine powered scale aircraft helicopters boats cars trucks Klotz ModeLUBE Clean BurnTM technology improves throttle response acceleration Exceptional film strength protects engines high RPM extreme heat competition applications Run leader. KLQTZ Call free catalog RACER TECHI/NE 219-749-0489 TOLL FREE ORDERLINE 800-242-0489 SPEC/AL F68/ WI/LA PiS0L5I/CTS Ill/C P0 BOX1/348FORTWAYA/E 1/1/48857 72 Model Aviation p clamp slides slots back side propeller can lined up against measuring arm pitch can read scale position station found accurate measurements light positioned behind gauge helpful As close gap between propeller measuring arm light visible edge propellerif slight gap between edge propeller measuring arm edge gap will show light have purchased propellers have ever wondered what actual pitch could make propeller performance comparisons Would like able determine pitch propellers help obtain consistent flying results might consider using McCombs method getting access propeller pitch gauge measure actual prop pitch Knowing actual prop pitch can put back pitch control ces products mentioned article APC propellers Landing Products Box 938 Knights Landing CA 95645 Graupner propellers Hobby Lobby International Inc 5614 Franklin Pike Circle Brentwood TN 37027 Making Scale Model Airplanes Fly WF McCombs Aircraft Data Box 763576 Dallas TX 75224 Prather pitch gauge Prather Products Inc 1660 Ravenna Ave Wilmington CA 90744 Top Flite props Great Planes Model Distributors Co Box 9021 Champaign IL 61826-9021 Master Airscrew props Windsor Propeller Co 384 Tesconi Court Santa Rosa CA 95401 Zinger props J&Z Products 25029 South Vermont Ave Harbor City CA 90710 V v4 iI/ JXe jVw Super Stand Wino Control Wing stable supported Adjust size plane Handy tray small parts Fast easy assembly Money back guarantee order call 1-800-254-6553 Mon thru Fri 9 5 pacific time Sat & Sun 11 5 pacific time JBM Products 13314 Mission Tierra Way Granada Hills CA 91344 Eagle aviation 513 435-9232 6042 No D ye West Carrollton Ohio 45449