TRUE DYI1AMIC SCffLIII PARTS ONE AND TWO series presented laws dynamic scale discussion flyability constraints final part will look two aircraft apply laws dynamic scale will also discuss few prototypes suitable dynamic scaling explain illustrations quoted takeoff dis tance distance required clear 50-ft obstacle Horsepower thrust sea level static values Bellanca Citabria 150S Fig 7 shows dy namic scale figures model aircraft three different scale factors N six five four Looking figures indicates model scales well within range existing equipment flyability model can probably built lighter scale weight improves flyability see last months article thrust power requirements can met using available model engines good 19 23 engine will put out enough power fly 1 / 16 scale model thrust would just barely equal dynamic scale value model built design goal 6 latest Fairchild NCT configuration conventionai airplane model flew beautifully 105 lbs two RK-20B ducted fan units K&B 35s power model built Nick Ziroli Fairchild lb seems realistic thrust weight ratio model 23 would acceptable Alternatively could build scale weight use 30 35 engine achieve required thrust case model would faster required dynamic scale flight much better match 1/5 scale N5 40 45 engine would fall right N4 Schnuerle 60 tuned pipe would necessary Cessna Turbo 337 Skymaster Fig 8 shows data four different scale sizes figures lead parameter values within performance envelope flyable model Power thrust requirements also well within values obtainable using readily avail able engines e N8 two Schnuerle 15s could used Two 19s would job 1/7 scale N6 two 30s would work 1/5 scale model would just slightly over powered two 40s Other designs two airplanes used ex amples both general light aviation air craft generally planes suitable true dynamic scale flyable RC models experience has shown lightplanes generally lead models exhibit realistic flight appearance prin ciples dynamic scale help understand As constrast lets consider category air planes suitable dynamic scale subjects World War II fighters airplanes exhibit approximately same general physical characteristics regardless make country origin example Messerschmitt Me109 weighed 5520 lb 1150-hp maximum speed 354 mph Grumman F4F-3 Wildcat weighed 5876 lb 1000 hp maximum speed 330 mph Hawker Hurricane weighed 6600 lb 1050 hp did 335 mph flat Out As matter fact WW II fighter planes weighed final part series art making model fly like its prototype take look some real airplanes see translate Scale subjects different size factors guide lines can big help picking Scale subject Part 3 Dominic J Palumbo 52 Model Aviation between4SOOand7OOOlbhadbetween 1000 200-hp engines maximum speeds between 300 375 mph Wing areas between 175 260 sq ft range wing loadings between 25 32 lb per sq ft Thrust weight ratios ranged 9 1 1 two characteristics make hard dynamic scaling planes maximum speed too darn fast thrust weight ratios isnt enough power available small enough engines Nevertheless can build models airplanes appear fly like full-size counterparts work backwards Start what available powerplants select scale factor allows achieve model weight gives flyable wing loading somewhere near thrust weight ratio want instance 60 powered model P-SI Mustang would have weigh no nine lbs order achieve desired thrust weight ratio scale factor 7 would give model about 56 sq ft wing area 9 lbs leads wing loading 26 oz/sq ft similar Pattern models 1/7 scale model built less 9 lbs course model would maneuverable slower landing technique will give design goal maximum weight allows select scale factor will tell what expect model way flying character istics comes down deciding whether build model P-51 1/7 scale 9 lb less let experience guide best approach estimate overall weight based weight major com ponent Some know precisely engine including muffler prop spinner fuel ParameterFull-SizeN6 N5 N4 Weight lb165076413202578 Wing Span ft344573688860 Wing Area sq ft1704726801063 Wing Loading lb/sq ft97162194243 Power hp150028054117 Thrust lb750347601120 Takeoff Distance ft56795113142 Maximum Speed mph130535865 Stall Speed mph45182023 Fig 7Bellanca Citabria 1505 single engine prop-driven Fig 8Cessna Turbo 337 Skymaster twin engine flapped prop-driven ParameterFull-SizeN8N7N6N5 Weight lb4630 90135215370 Wing Span ft381476544635762 Wing Area sq ft2025316413563810 Wing Loading lb/sq ft229285327382457 Power hp per engine210015023040075 Thrust lb per engine1000195292463800 Takeoff Distance ft1675209239279335 Maximum Speed mph230818794103 Stall Speed mph7025272931 tank landing gear radio equipment can estimate structural weight relating components structure structures similar sizes have built before Flying Experienced RC pilots have flown true dynamically scaled models aerodynamic research will attest fact its very different kind RC flying kind theyre used thrust weight ratios fullsize general aviation planes normally around 2 4 somewhat lower typical RC airplane Hence has get used making moderately banked turns gentle climbouts gracefully large maneuvers Because good idea build model exact dynamic scale give yourself some margin Continued page 130 Seed della bill postage handling eane address ear 12-page easaleg et fl/C sailpianes sport planes spert scale acoesserins CATALOG 1OO Priens range free 22495 us $9495 Kits can seen year neal dealer SCALE RIG JEMCO SPORT SCALE BALSA COVERED FOAM WING CORES October 1981 53 SAILPLANES-R/C SPORT R/C COMPETITION & SPORT FOR BARNSTORMERS AND STUDENTS ELECTRONIC SERVICENTER FACTORY AUTHORIZED WARRANTY SERVICE FOR KRAFT over 35 other manufacturers Tired wasting money radio service ios per formance too important jeopardized inexperien ced uncaring technician company just person re pairs RC equipment RCer cares about radio ME 24 HOUR SERVICE NEAL WARREN South 21St Street p Philadelphia PA 19103 Tel 215 564-0800 MODELMANIA IGUR RANUFACTIJRERS iMElE 6 SAGEC 1STWI 113 *8 48 RC ILMIJPP53584749 182 PLITABA 6FN 11526 SERIAlS3699918399 194 PUTABA 6FN 9-527 SERUOS3299919699 115 HOTSTUPP 2oz SUPER OR PEG1299679 195 TOPFLITE PIPER CUB J3NE[d169 996199 196 GEMINI SUPER CNA1V KIT55954499 121 ROPHAT ISCIDENT METER JLENEL19991399 197 ENGR 46X TN 11-MIFF98966799 198 ENYR 35 TN UrRFP59983999 199 RASTER AIR SCPEU PROPS 166125*69 286 RASTER AIR SCRES PROPS 11 ALL159999 991 COG TO 849 UP 65131661799 992 AITRRONICS 24394 STANDAPO SERUS29992699 992 AIPTRONICS 24431 11191 TERUG39992799 284 RIRTROHICS 6ci PLONT-PAF2299916699 995 DADE 886146 6 SI-IGUTEP GAS-GLO1699779* 996 OCLOBEPO -WiEl TOTE19991499 287 SCM P8-3 FIELD 669126991999 998 RADIO CONTROL 8JYEPS WIDE 1961999799 289 TOPPLITE NYLON PROPS 16613599 218 TUPFLITE 1152 MONOKOTE IRON21991499 128 0PF EPlIN EPOXY 1603 SIZE1199749 127 K118 RC LOAD UP SHORT 6 FOR9 779 126 6*8 PC LONG OR SHORT 12 FOR1439 116 ZINGERTUPPLITE 186 6 POP549 117 ZINGEPTOPPLITE 11 6 POP9 649 211 ANDRESJS AERORASTER 3001 COST98995958 212 DREMEL 3B1371*572*736 56O ALL 4RNOFF LIST 213 DUBRO 6141K PILL FUEL PISlP1895675 214 *DUIi9S 1217 MR GABBY TUG 47196889999 215 K6B 9186 75CC OUCTED PAN ENG168669999 216 PICA BUCKER JI6IGSEISTER169956999 217 PICA OLELLIST 2-4699995999 INSTOCK**FiAC UFFLERSPIPES RITE FOP ALL PRICES SEAD ALL ORDERS AND IN61UIRES T2 RODELSANIA PO BOX 179 ROCKR6AY PARK NY 11694 ALL PRICES SUBJECT TO CHANGE OFFER 0000 TIL 19TH ME THIS ADNTH LRBESS CURRENT SUPPLIES ABE EXHAUSTED 181 SPECIALSLIST FREE 6ITH ORDERS CR MEND SAGE AND 6168 REFUNDABLE NITH ORDER PREE * PPEE * GIFT 111TH PLL SAUCES FREE FREE ORDERING INFORSATION 5088 AD COD ALL PRICES INCLUDE 6 55 CSSH GISCOLINT MIN NET ORDER 616 SATTERUISA ACCEPTED BUT YOU liST ADD 511 BACK TO TOTAL INCLUDE CARD B AND EXPIRATION DAlE INTERBAIR B 11 SIGNATURE SF CAPE -ELDER SNIPPINONANDLIAD 16663966 ADD 30639017808 MED 666 SUER 7868 660 91. SAN SF 1256 650 29 LBS SiJERSIZE BOX ADD EXTRA 0960 SLIT SF CONT US 660 1511 OP TOTAL FOP SHIPPING ALL IIUNIES 951ST BE Ill US CURRENCY ALL SALES ARE FINAL HLLO6 TIME FOR PERSONAL Ci-ECK TO CLEAR V RESIDEATS IIUST ADD APPLICABLE SALES TAX INCLUDE SASE FOR ALL ISGUIRES SPECIFY SIZE COLOR AND TPE 11NEREUEE REGUIREG AD PREPARED ON JLLY 19 1931 24 HOUR SERVICE Mon-Fri 9AM-53OPM Wed night till 8PM Sat 9AM Noon $2 number copies including Sympo reports $3 total surface mail anywhere world Air mail $4 per copy US $4 Europe $5 Far East Pacific US dollars payable NFFS Save postage order whole club once Directory update Blue Ridge Models makes dandy Coupe P-30 HLG kits supplies sorts FF goodies has moved new address PO Box 429 Skyland NC 28776 Both NFFS Supplies NFFS Plans Publications have new items new price lists NFFS members already will have received new lists NFFS Digest Others send SASE 1602 Encanto P1 Walnut Creek CA 94596 4858 Moorpark Ave San Jose CA 95129 respectively Almost forgot arent big building kits Blue Ridge will sell just ribs its Coupe dHiver kit Romak builds Wake field models using Coupe ribs glide terrific Bob Meuser 4200 Gregory St. Oakland CA 94619 Scaling/Palumbo Continued page 53 flyability constraints Knowing values flight parameters allows determine far short dynamic flight scale model will can compensate flying style conclusion hope series has helped understand bit what goes planning Scale project have presented set laws can useful planning hope find bid readers have patience bear fond adieu happy flying FF Old-Timers/Haught Continued page 60 key parts building kit order have patterns repairs build another fly-away occors Since Korda laid out require two sheets of parts simply pinned printwood sheet over plain sheet cut duplicate parts leaving set sheets intact later use Korda builds fast really brings out old-time spirit Building up two sides joining box fuselage has always fas cinated although sometimes turns frustrating experience trying keep everything square true solved problem using pair temporary sheet bulkheads cabin area other cross-braces installed absence diagonal bracing fuselage has always bothered covered fuselage SGM silkspan add little structural integrity wings covered GM grade tail surfaces 00 grade Actually silk would have better fuselage poked two three holes before model flown main criticism kit prop single-blade folder per original Instead being carved properly laid-out block thus having relatively known pitch kit supplied printed blade outline piece 34 balsa plank An inclined printed rectangle butt end wood clue pitch After carving attaching blade hub block according instructions plan appeared have far too much pitch borne Out testing 12-strand motor FAI rubber would turn fast enough fly model well able field-trim width blade attain fair performance feel area should worked simple triangle pitch gauge would help other concern lack formed prop shaft bearing hardware True items available mail order addition would improve kit increas ing cost ordered separately No covering wheels supplied items easier locate neighborhood hobby shops pleased 4Ks Korda kit encouragement needed complete long-awaited project An ounce prevention aforementioned Korda project met untimely end burst ing motor totally wrecked fuselage simple winding tube constructed 1 30 Model Aviation THE WORLDS FIRST ADJUSTABLE HAND SANDEREXTRA HANDS THE DUPLICATOR MKI Pat PendingModel Aircraft Covering Tool Just duplicator does tollowingModel No 36 Pat No 33a6727l creates aCCUraIR iao round patterns Al last breakthroUgh hil thR Toledo edges wings..from iia thro 112 make Cosering easyMacs Dallas fuselage etClljded tooland expert Duplicates roundsi, Make own s types stabs rudders deepincrsments fast noviCe~tt Pasadena shows semi-rounds CGrGBspatlerns infiniteof CooBring materialAl dealer angles up 1numbRr sizesfrom mOnokote 10order direct $1995 Al3l4 oz fiberglassplus $200 shipping dealer order direct $1995 plus $200 shippingGREAT TIME SAVERS INVENTED BY AVID MODELER TO MAKE BUILDING EVEN MORE ENJOYABLE Once add toot cottechon N J LIND COMPANY wonder got along 2912 Walker Lee Alamitos CA 90720 Distibutors inquiries incited
Edition: Model Aviation - 1981/10
Page Numbers: 52, 53, 130
TRUE DYI1AMIC SCffLIII PARTS ONE AND TWO series presented laws dynamic scale discussion flyability constraints final part will look two aircraft apply laws dynamic scale will also discuss few prototypes suitable dynamic scaling explain illustrations quoted takeoff dis tance distance required clear 50-ft obstacle Horsepower thrust sea level static values Bellanca Citabria 150S Fig 7 shows dy namic scale figures model aircraft three different scale factors N six five four Looking figures indicates model scales well within range existing equipment flyability model can probably built lighter scale weight improves flyability see last months article thrust power requirements can met using available model engines good 19 23 engine will put out enough power fly 1 / 16 scale model thrust would just barely equal dynamic scale value model built design goal 6 latest Fairchild NCT configuration conventionai airplane model flew beautifully 105 lbs two RK-20B ducted fan units K&B 35s power model built Nick Ziroli Fairchild lb seems realistic thrust weight ratio model 23 would acceptable Alternatively could build scale weight use 30 35 engine achieve required thrust case model would faster required dynamic scale flight much better match 1/5 scale N5 40 45 engine would fall right N4 Schnuerle 60 tuned pipe would necessary Cessna Turbo 337 Skymaster Fig 8 shows data four different scale sizes figures lead parameter values within performance envelope flyable model Power thrust requirements also well within values obtainable using readily avail able engines e N8 two Schnuerle 15s could used Two 19s would job 1/7 scale N6 two 30s would work 1/5 scale model would just slightly over powered two 40s Other designs two airplanes used ex amples both general light aviation air craft generally planes suitable true dynamic scale flyable RC models experience has shown lightplanes generally lead models exhibit realistic flight appearance prin ciples dynamic scale help understand As constrast lets consider category air planes suitable dynamic scale subjects World War II fighters airplanes exhibit approximately same general physical characteristics regardless make country origin example Messerschmitt Me109 weighed 5520 lb 1150-hp maximum speed 354 mph Grumman F4F-3 Wildcat weighed 5876 lb 1000 hp maximum speed 330 mph Hawker Hurricane weighed 6600 lb 1050 hp did 335 mph flat Out As matter fact WW II fighter planes weighed final part series art making model fly like its prototype take look some real airplanes see translate Scale subjects different size factors guide lines can big help picking Scale subject Part 3 Dominic J Palumbo 52 Model Aviation between4SOOand7OOOlbhadbetween 1000 200-hp engines maximum speeds between 300 375 mph Wing areas between 175 260 sq ft range wing loadings between 25 32 lb per sq ft Thrust weight ratios ranged 9 1 1 two characteristics make hard dynamic scaling planes maximum speed too darn fast thrust weight ratios isnt enough power available small enough engines Nevertheless can build models airplanes appear fly like full-size counterparts work backwards Start what available powerplants select scale factor allows achieve model weight gives flyable wing loading somewhere near thrust weight ratio want instance 60 powered model P-SI Mustang would have weigh no nine lbs order achieve desired thrust weight ratio scale factor 7 would give model about 56 sq ft wing area 9 lbs leads wing loading 26 oz/sq ft similar Pattern models 1/7 scale model built less 9 lbs course model would maneuverable slower landing technique will give design goal maximum weight allows select scale factor will tell what expect model way flying character istics comes down deciding whether build model P-51 1/7 scale 9 lb less let experience guide best approach estimate overall weight based weight major com ponent Some know precisely engine including muffler prop spinner fuel ParameterFull-SizeN6 N5 N4 Weight lb165076413202578 Wing Span ft344573688860 Wing Area sq ft1704726801063 Wing Loading lb/sq ft97162194243 Power hp150028054117 Thrust lb750347601120 Takeoff Distance ft56795113142 Maximum Speed mph130535865 Stall Speed mph45182023 Fig 7Bellanca Citabria 1505 single engine prop-driven Fig 8Cessna Turbo 337 Skymaster twin engine flapped prop-driven ParameterFull-SizeN8N7N6N5 Weight lb4630 90135215370 Wing Span ft381476544635762 Wing Area sq ft2025316413563810 Wing Loading lb/sq ft229285327382457 Power hp per engine210015023040075 Thrust lb per engine1000195292463800 Takeoff Distance ft1675209239279335 Maximum Speed mph230818794103 Stall Speed mph7025272931 tank landing gear radio equipment can estimate structural weight relating components structure structures similar sizes have built before Flying Experienced RC pilots have flown true dynamically scaled models aerodynamic research will attest fact its very different kind RC flying kind theyre used thrust weight ratios fullsize general aviation planes normally around 2 4 somewhat lower typical RC airplane Hence has get used making moderately banked turns gentle climbouts gracefully large maneuvers Because good idea build model exact dynamic scale give yourself some margin Continued page 130 Seed della bill postage handling eane address ear 12-page easaleg et fl/C sailpianes sport planes spert scale acoesserins CATALOG 1OO Priens range free 22495 us $9495 Kits can seen year neal dealer SCALE RIG JEMCO SPORT SCALE BALSA COVERED FOAM WING CORES October 1981 53 SAILPLANES-R/C SPORT R/C COMPETITION & SPORT FOR BARNSTORMERS AND STUDENTS ELECTRONIC SERVICENTER FACTORY AUTHORIZED WARRANTY SERVICE FOR KRAFT over 35 other manufacturers Tired wasting money radio service ios per formance too important jeopardized inexperien ced uncaring technician company just person re pairs RC equipment RCer cares about radio ME 24 HOUR SERVICE NEAL WARREN South 21St Street p Philadelphia PA 19103 Tel 215 564-0800 MODELMANIA IGUR RANUFACTIJRERS iMElE 6 SAGEC 1STWI 113 *8 48 RC ILMIJPP53584749 182 PLITABA 6FN 11526 SERIAlS3699918399 194 PUTABA 6FN 9-527 SERUOS3299919699 115 HOTSTUPP 2oz SUPER OR PEG1299679 195 TOPFLITE PIPER CUB J3NE[d169 996199 196 GEMINI SUPER CNA1V KIT55954499 121 ROPHAT ISCIDENT METER JLENEL19991399 197 ENGR 46X TN 11-MIFF98966799 198 ENYR 35 TN UrRFP59983999 199 RASTER AIR SCPEU PROPS 166125*69 286 RASTER AIR SCRES PROPS 11 ALL159999 991 COG TO 849 UP 65131661799 992 AITRRONICS 24394 STANDAPO SERUS29992699 992 AIPTRONICS 24431 11191 TERUG39992799 284 RIRTROHICS 6ci PLONT-PAF2299916699 995 DADE 886146 6 SI-IGUTEP GAS-GLO1699779* 996 OCLOBEPO -WiEl TOTE19991499 287 SCM P8-3 FIELD 669126991999 998 RADIO CONTROL 8JYEPS WIDE 1961999799 289 TOPPLITE NYLON PROPS 16613599 218 TUPFLITE 1152 MONOKOTE IRON21991499 128 0PF EPlIN EPOXY 1603 SIZE1199749 127 K118 RC LOAD UP SHORT 6 FOR9 779 126 6*8 PC LONG OR SHORT 12 FOR1439 116 ZINGERTUPPLITE 186 6 POP549 117 ZINGEPTOPPLITE 11 6 POP9 649 211 ANDRESJS AERORASTER 3001 COST98995958 212 DREMEL 3B1371*572*736 56O ALL 4RNOFF LIST 213 DUBRO 6141K PILL FUEL PISlP1895675 214 *DUIi9S 1217 MR GABBY TUG 47196889999 215 K6B 9186 75CC OUCTED PAN ENG168669999 216 PICA BUCKER JI6IGSEISTER169956999 217 PICA OLELLIST 2-4699995999 INSTOCK**FiAC UFFLERSPIPES RITE FOP ALL PRICES SEAD ALL ORDERS AND IN61UIRES T2 RODELSANIA PO BOX 179 ROCKR6AY PARK NY 11694 ALL PRICES SUBJECT TO CHANGE OFFER 0000 TIL 19TH ME THIS ADNTH LRBESS CURRENT SUPPLIES ABE EXHAUSTED 181 SPECIALSLIST FREE 6ITH ORDERS CR MEND SAGE AND 6168 REFUNDABLE NITH ORDER PREE * PPEE * GIFT 111TH PLL SAUCES FREE FREE ORDERING INFORSATION 5088 AD COD ALL PRICES INCLUDE 6 55 CSSH GISCOLINT MIN NET ORDER 616 SATTERUISA ACCEPTED BUT YOU liST ADD 511 BACK TO TOTAL INCLUDE CARD B AND EXPIRATION DAlE INTERBAIR B 11 SIGNATURE SF CAPE -ELDER SNIPPINONANDLIAD 16663966 ADD 30639017808 MED 666 SUER 7868 660 91. SAN SF 1256 650 29 LBS SiJERSIZE BOX ADD EXTRA 0960 SLIT SF CONT US 660 1511 OP TOTAL FOP SHIPPING ALL IIUNIES 951ST BE Ill US CURRENCY ALL SALES ARE FINAL HLLO6 TIME FOR PERSONAL Ci-ECK TO CLEAR V RESIDEATS IIUST ADD APPLICABLE SALES TAX INCLUDE SASE FOR ALL ISGUIRES SPECIFY SIZE COLOR AND TPE 11NEREUEE REGUIREG AD PREPARED ON JLLY 19 1931 24 HOUR SERVICE Mon-Fri 9AM-53OPM Wed night till 8PM Sat 9AM Noon $2 number copies including Sympo reports $3 total surface mail anywhere world Air mail $4 per copy US $4 Europe $5 Far East Pacific US dollars payable NFFS Save postage order whole club once Directory update Blue Ridge Models makes dandy Coupe P-30 HLG kits supplies sorts FF goodies has moved new address PO Box 429 Skyland NC 28776 Both NFFS Supplies NFFS Plans Publications have new items new price lists NFFS members already will have received new lists NFFS Digest Others send SASE 1602 Encanto P1 Walnut Creek CA 94596 4858 Moorpark Ave San Jose CA 95129 respectively Almost forgot arent big building kits Blue Ridge will sell just ribs its Coupe dHiver kit Romak builds Wake field models using Coupe ribs glide terrific Bob Meuser 4200 Gregory St. Oakland CA 94619 Scaling/Palumbo Continued page 53 flyability constraints Knowing values flight parameters allows determine far short dynamic flight scale model will can compensate flying style conclusion hope series has helped understand bit what goes planning Scale project have presented set laws can useful planning hope find bid readers have patience bear fond adieu happy flying FF Old-Timers/Haught Continued page 60 key parts building kit order have patterns repairs build another fly-away occors Since Korda laid out require two sheets of parts simply pinned printwood sheet over plain sheet cut duplicate parts leaving set sheets intact later use Korda builds fast really brings out old-time spirit Building up two sides joining box fuselage has always fas cinated although sometimes turns frustrating experience trying keep everything square true solved problem using pair temporary sheet bulkheads cabin area other cross-braces installed absence diagonal bracing fuselage has always bothered covered fuselage SGM silkspan add little structural integrity wings covered GM grade tail surfaces 00 grade Actually silk would have better fuselage poked two three holes before model flown main criticism kit prop single-blade folder per original Instead being carved properly laid-out block thus having relatively known pitch kit supplied printed blade outline piece 34 balsa plank An inclined printed rectangle butt end wood clue pitch After carving attaching blade hub block according instructions plan appeared have far too much pitch borne Out testing 12-strand motor FAI rubber would turn fast enough fly model well able field-trim width blade attain fair performance feel area should worked simple triangle pitch gauge would help other concern lack formed prop shaft bearing hardware True items available mail order addition would improve kit increas ing cost ordered separately No covering wheels supplied items easier locate neighborhood hobby shops pleased 4Ks Korda kit encouragement needed complete long-awaited project An ounce prevention aforementioned Korda project met untimely end burst ing motor totally wrecked fuselage simple winding tube constructed 1 30 Model Aviation THE WORLDS FIRST ADJUSTABLE HAND SANDEREXTRA HANDS THE DUPLICATOR MKI Pat PendingModel Aircraft Covering Tool Just duplicator does tollowingModel No 36 Pat No 33a6727l creates aCCUraIR iao round patterns Al last breakthroUgh hil thR Toledo edges wings..from iia thro 112 make Cosering easyMacs Dallas fuselage etClljded tooland expert Duplicates roundsi, Make own s types stabs rudders deepincrsments fast noviCe~tt Pasadena shows semi-rounds CGrGBspatlerns infiniteof CooBring materialAl dealer angles up 1numbRr sizesfrom mOnokote 10order direct $1995 Al3l4 oz fiberglassplus $200 shipping dealer order direct $1995 plus $200 shippingGREAT TIME SAVERS INVENTED BY AVID MODELER TO MAKE BUILDING EVEN MORE ENJOYABLE Once add toot cottechon N J LIND COMPANY wonder got along 2912 Walker Lee Alamitos CA 90720 Distibutors inquiries incited
Edition: Model Aviation - 1981/10
Page Numbers: 52, 53, 130
TRUE DYI1AMIC SCffLIII PARTS ONE AND TWO series presented laws dynamic scale discussion flyability constraints final part will look two aircraft apply laws dynamic scale will also discuss few prototypes suitable dynamic scaling explain illustrations quoted takeoff dis tance distance required clear 50-ft obstacle Horsepower thrust sea level static values Bellanca Citabria 150S Fig 7 shows dy namic scale figures model aircraft three different scale factors N six five four Looking figures indicates model scales well within range existing equipment flyability model can probably built lighter scale weight improves flyability see last months article thrust power requirements can met using available model engines good 19 23 engine will put out enough power fly 1 / 16 scale model thrust would just barely equal dynamic scale value model built design goal 6 latest Fairchild NCT configuration conventionai airplane model flew beautifully 105 lbs two RK-20B ducted fan units K&B 35s power model built Nick Ziroli Fairchild lb seems realistic thrust weight ratio model 23 would acceptable Alternatively could build scale weight use 30 35 engine achieve required thrust case model would faster required dynamic scale flight much better match 1/5 scale N5 40 45 engine would fall right N4 Schnuerle 60 tuned pipe would necessary Cessna Turbo 337 Skymaster Fig 8 shows data four different scale sizes figures lead parameter values within performance envelope flyable model Power thrust requirements also well within values obtainable using readily avail able engines e N8 two Schnuerle 15s could used Two 19s would job 1/7 scale N6 two 30s would work 1/5 scale model would just slightly over powered two 40s Other designs two airplanes used ex amples both general light aviation air craft generally planes suitable true dynamic scale flyable RC models experience has shown lightplanes generally lead models exhibit realistic flight appearance prin ciples dynamic scale help understand As constrast lets consider category air planes suitable dynamic scale subjects World War II fighters airplanes exhibit approximately same general physical characteristics regardless make country origin example Messerschmitt Me109 weighed 5520 lb 1150-hp maximum speed 354 mph Grumman F4F-3 Wildcat weighed 5876 lb 1000 hp maximum speed 330 mph Hawker Hurricane weighed 6600 lb 1050 hp did 335 mph flat Out As matter fact WW II fighter planes weighed final part series art making model fly like its prototype take look some real airplanes see translate Scale subjects different size factors guide lines can big help picking Scale subject Part 3 Dominic J Palumbo 52 Model Aviation between4SOOand7OOOlbhadbetween 1000 200-hp engines maximum speeds between 300 375 mph Wing areas between 175 260 sq ft range wing loadings between 25 32 lb per sq ft Thrust weight ratios ranged 9 1 1 two characteristics make hard dynamic scaling planes maximum speed too darn fast thrust weight ratios isnt enough power available small enough engines Nevertheless can build models airplanes appear fly like full-size counterparts work backwards Start what available powerplants select scale factor allows achieve model weight gives flyable wing loading somewhere near thrust weight ratio want instance 60 powered model P-SI Mustang would have weigh no nine lbs order achieve desired thrust weight ratio scale factor 7 would give model about 56 sq ft wing area 9 lbs leads wing loading 26 oz/sq ft similar Pattern models 1/7 scale model built less 9 lbs course model would maneuverable slower landing technique will give design goal maximum weight allows select scale factor will tell what expect model way flying character istics comes down deciding whether build model P-51 1/7 scale 9 lb less let experience guide best approach estimate overall weight based weight major com ponent Some know precisely engine including muffler prop spinner fuel ParameterFull-SizeN6 N5 N4 Weight lb165076413202578 Wing Span ft344573688860 Wing Area sq ft1704726801063 Wing Loading lb/sq ft97162194243 Power hp150028054117 Thrust lb750347601120 Takeoff Distance ft56795113142 Maximum Speed mph130535865 Stall Speed mph45182023 Fig 7Bellanca Citabria 1505 single engine prop-driven Fig 8Cessna Turbo 337 Skymaster twin engine flapped prop-driven ParameterFull-SizeN8N7N6N5 Weight lb4630 90135215370 Wing Span ft381476544635762 Wing Area sq ft2025316413563810 Wing Loading lb/sq ft229285327382457 Power hp per engine210015023040075 Thrust lb per engine1000195292463800 Takeoff Distance ft1675209239279335 Maximum Speed mph230818794103 Stall Speed mph7025272931 tank landing gear radio equipment can estimate structural weight relating components structure structures similar sizes have built before Flying Experienced RC pilots have flown true dynamically scaled models aerodynamic research will attest fact its very different kind RC flying kind theyre used thrust weight ratios fullsize general aviation planes normally around 2 4 somewhat lower typical RC airplane Hence has get used making moderately banked turns gentle climbouts gracefully large maneuvers Because good idea build model exact dynamic scale give yourself some margin Continued page 130 Seed della bill postage handling eane address ear 12-page easaleg et fl/C sailpianes sport planes spert scale acoesserins CATALOG 1OO Priens range free 22495 us $9495 Kits can seen year neal dealer SCALE RIG JEMCO SPORT SCALE BALSA COVERED FOAM WING CORES October 1981 53 SAILPLANES-R/C SPORT R/C COMPETITION & SPORT FOR BARNSTORMERS AND STUDENTS ELECTRONIC SERVICENTER FACTORY AUTHORIZED WARRANTY SERVICE FOR KRAFT over 35 other manufacturers Tired wasting money radio service ios per formance too important jeopardized inexperien ced uncaring technician company just person re pairs RC equipment RCer cares about radio ME 24 HOUR SERVICE NEAL WARREN South 21St Street p Philadelphia PA 19103 Tel 215 564-0800 MODELMANIA IGUR RANUFACTIJRERS iMElE 6 SAGEC 1STWI 113 *8 48 RC ILMIJPP53584749 182 PLITABA 6FN 11526 SERIAlS3699918399 194 PUTABA 6FN 9-527 SERUOS3299919699 115 HOTSTUPP 2oz SUPER OR PEG1299679 195 TOPFLITE PIPER CUB J3NE[d169 996199 196 GEMINI SUPER CNA1V KIT55954499 121 ROPHAT ISCIDENT METER JLENEL19991399 197 ENGR 46X TN 11-MIFF98966799 198 ENYR 35 TN UrRFP59983999 199 RASTER AIR SCPEU PROPS 166125*69 286 RASTER AIR SCRES PROPS 11 ALL159999 991 COG TO 849 UP 65131661799 992 AITRRONICS 24394 STANDAPO SERUS29992699 992 AIPTRONICS 24431 11191 TERUG39992799 284 RIRTROHICS 6ci PLONT-PAF2299916699 995 DADE 886146 6 SI-IGUTEP GAS-GLO1699779* 996 OCLOBEPO -WiEl TOTE19991499 287 SCM P8-3 FIELD 669126991999 998 RADIO CONTROL 8JYEPS WIDE 1961999799 289 TOPPLITE NYLON PROPS 16613599 218 TUPFLITE 1152 MONOKOTE IRON21991499 128 0PF EPlIN EPOXY 1603 SIZE1199749 127 K118 RC LOAD UP SHORT 6 FOR9 779 126 6*8 PC LONG OR SHORT 12 FOR1439 116 ZINGERTUPPLITE 186 6 POP549 117 ZINGEPTOPPLITE 11 6 POP9 649 211 ANDRESJS AERORASTER 3001 COST98995958 212 DREMEL 3B1371*572*736 56O ALL 4RNOFF LIST 213 DUBRO 6141K PILL FUEL PISlP1895675 214 *DUIi9S 1217 MR GABBY TUG 47196889999 215 K6B 9186 75CC OUCTED PAN ENG168669999 216 PICA BUCKER JI6IGSEISTER169956999 217 PICA OLELLIST 2-4699995999 INSTOCK**FiAC UFFLERSPIPES RITE FOP ALL PRICES SEAD ALL ORDERS AND IN61UIRES T2 RODELSANIA PO BOX 179 ROCKR6AY PARK NY 11694 ALL PRICES SUBJECT TO CHANGE OFFER 0000 TIL 19TH ME THIS ADNTH LRBESS CURRENT SUPPLIES ABE EXHAUSTED 181 SPECIALSLIST FREE 6ITH ORDERS CR MEND SAGE AND 6168 REFUNDABLE NITH ORDER PREE * PPEE * GIFT 111TH PLL SAUCES FREE FREE ORDERING INFORSATION 5088 AD COD ALL PRICES INCLUDE 6 55 CSSH GISCOLINT MIN NET ORDER 616 SATTERUISA ACCEPTED BUT YOU liST ADD 511 BACK TO TOTAL INCLUDE CARD B AND EXPIRATION DAlE INTERBAIR B 11 SIGNATURE SF CAPE -ELDER SNIPPINONANDLIAD 16663966 ADD 30639017808 MED 666 SUER 7868 660 91. SAN SF 1256 650 29 LBS SiJERSIZE BOX ADD EXTRA 0960 SLIT SF CONT US 660 1511 OP TOTAL FOP SHIPPING ALL IIUNIES 951ST BE Ill US CURRENCY ALL SALES ARE FINAL HLLO6 TIME FOR PERSONAL Ci-ECK TO CLEAR V RESIDEATS IIUST ADD APPLICABLE SALES TAX INCLUDE SASE FOR ALL ISGUIRES SPECIFY SIZE COLOR AND TPE 11NEREUEE REGUIREG AD PREPARED ON JLLY 19 1931 24 HOUR SERVICE Mon-Fri 9AM-53OPM Wed night till 8PM Sat 9AM Noon $2 number copies including Sympo reports $3 total surface mail anywhere world Air mail $4 per copy US $4 Europe $5 Far East Pacific US dollars payable NFFS Save postage order whole club once Directory update Blue Ridge Models makes dandy Coupe P-30 HLG kits supplies sorts FF goodies has moved new address PO Box 429 Skyland NC 28776 Both NFFS Supplies NFFS Plans Publications have new items new price lists NFFS members already will have received new lists NFFS Digest Others send SASE 1602 Encanto P1 Walnut Creek CA 94596 4858 Moorpark Ave San Jose CA 95129 respectively Almost forgot arent big building kits Blue Ridge will sell just ribs its Coupe dHiver kit Romak builds Wake field models using Coupe ribs glide terrific Bob Meuser 4200 Gregory St. Oakland CA 94619 Scaling/Palumbo Continued page 53 flyability constraints Knowing values flight parameters allows determine far short dynamic flight scale model will can compensate flying style conclusion hope series has helped understand bit what goes planning Scale project have presented set laws can useful planning hope find bid readers have patience bear fond adieu happy flying FF Old-Timers/Haught Continued page 60 key parts building kit order have patterns repairs build another fly-away occors Since Korda laid out require two sheets of parts simply pinned printwood sheet over plain sheet cut duplicate parts leaving set sheets intact later use Korda builds fast really brings out old-time spirit Building up two sides joining box fuselage has always fas cinated although sometimes turns frustrating experience trying keep everything square true solved problem using pair temporary sheet bulkheads cabin area other cross-braces installed absence diagonal bracing fuselage has always bothered covered fuselage SGM silkspan add little structural integrity wings covered GM grade tail surfaces 00 grade Actually silk would have better fuselage poked two three holes before model flown main criticism kit prop single-blade folder per original Instead being carved properly laid-out block thus having relatively known pitch kit supplied printed blade outline piece 34 balsa plank An inclined printed rectangle butt end wood clue pitch After carving attaching blade hub block according instructions plan appeared have far too much pitch borne Out testing 12-strand motor FAI rubber would turn fast enough fly model well able field-trim width blade attain fair performance feel area should worked simple triangle pitch gauge would help other concern lack formed prop shaft bearing hardware True items available mail order addition would improve kit increas ing cost ordered separately No covering wheels supplied items easier locate neighborhood hobby shops pleased 4Ks Korda kit encouragement needed complete long-awaited project An ounce prevention aforementioned Korda project met untimely end burst ing motor totally wrecked fuselage simple winding tube constructed 1 30 Model Aviation THE WORLDS FIRST ADJUSTABLE HAND SANDEREXTRA HANDS THE DUPLICATOR MKI Pat PendingModel Aircraft Covering Tool Just duplicator does tollowingModel No 36 Pat No 33a6727l creates aCCUraIR iao round patterns Al last breakthroUgh hil thR Toledo edges wings..from iia thro 112 make Cosering easyMacs Dallas fuselage etClljded tooland expert Duplicates roundsi, Make own s types stabs rudders deepincrsments fast noviCe~tt Pasadena shows semi-rounds CGrGBspatlerns infiniteof CooBring materialAl dealer angles up 1numbRr sizesfrom mOnokote 10order direct $1995 Al3l4 oz fiberglassplus $200 shipping dealer order direct $1995 plus $200 shippingGREAT TIME SAVERS INVENTED BY AVID MODELER TO MAKE BUILDING EVEN MORE ENJOYABLE Once add toot cottechon N J LIND COMPANY wonder got along 2912 Walker Lee Alamitos CA 90720 Distibutors inquiries incited