NEW NEWSLEflER longest-last ing FF clubs nation founded 1936 Brooklyn Sky-Scrapers has finally begun pub lish newsletter Called Flyoff currently quarterly publication intended supple ment rather compete other magazines newsletters cover FF model activity first issue held eight pages model plans comments introductory material slick pa per typeset format fully professional respectvery impressive staff editor Bob Hatschek assisted Lydia Joe Wagner Bill Colish promises technological content will get avallable space future issues price $2 per issue US $3 per issue foreign subscribers minimum subscription five sues Payment must made US funds drawn US bank payable Brooklyn Sky-Scrapers Send correspondence FLYOFF c/o Robert Hatschek 316 Grosvenor St Douglaston NY 11363 NFFS Free Flight Hall Fame Two Indoor pi oneers honored National Free Flight Society year Frank Cummings Walter Erbach Frank all-time top fliers superbly crafted flown models has largely inactive since 1966 World Cham pionships Debrecen Hungary Walt Erbach has supported Indoor active participation years has very creative imagination recent years efforts have concentrated toward developing Ornithopters led way recent upsurge Ornithopter activity performance DALMAA model kitted three years Denver Area Indoor Model Airplane Association has engaged doing public service University Colorado consists special building classes aerospace engineering fresh men followed competition finished alr craft return DAIMAA allowed use Balch Field House 40-ft ceiling door contests klt used classes P-24 Con dor Mace Model Aircraft Company 359 South 119th East Ave Tulsa OK 74128 tele phone 918/437-5490 specially engineered kit built totally inexperienced per sons minimum supervision plans carry fully detailed instructions pro fusely expertly illustrated Critical dimen sions assembly alignment other sticky details handled using jigs fixtures furn ished klt bottom line seven 80-plus models built September 1987 ses Continued page 153 66 Model Aviation Free Flight Indoor Bud Tenny Box 545 RIchardson TX 75080 Heres commercially available cork-faced gallon-jug form Indoor props Line show customary angle laying out prop blanks info column Jesse Shepherds Easy B has advanced structural features explained Buds co lumn wing ribs Below actually two-ply pieces balsa spread apart dur ing wing construction held condition being glued thin spanwise spars visIble photo prestresses balsa increasing structural rigidity Cranford himself Yet copy elusive 575 plans remains uncovered Can anyone out help us Also note fact Dan Lutz cur rently toying idea organizing re union of former modelers once flew Rosecrans Western wonder years should materialize should reunion Anyone interested such affair urged contact Dan Lutz 455 S Stage Coach Lane Fallbrook CA 92028 offer sup port Meanwhile Dan have often talked putring together Zeek article publication drawings involved could fill magazine itself mention fact holes still require plugging So recently compromised beginning se ries short segments column turn might pry loose some additional Zeek infor mation go along Anyway shall give shot think will enjoy Part II will next time October issue Till See ya downwind FF Indoor/Tenny Continued page 66 sion flew over two minutes Baich Field House Thats bad models covered Japanese tissue using relatively tiny plastic props P-24 Condor kit outstanding next step follow AMA Cub should con sidered club trying build up activity and/or train new builders Easy B advancement major prob lems competition-weight Easy B models lightweight wings usually have low torsional rigidity often makes models hair-trigger fly especially under high torque Two photos show Jesse Shepherds elegant solution problem glance first photo may lead say Warren truss diagonal ribs arent new second photo can see whats new diagonal rib dual rib bowed slightly locked place two very thin cap spars glued top ribs result very strong wingboth deflection torsion particular wing weighs same Jesses standard wing 0392 gin easily twice three times strong torsion Jesse feels ribs cap spars both stronger needed plans cut down next dimensions follows rib pair 0028-in deep cut 001-in sheet Cap spar 005-in deep cut 0008in sheet LE TE 007-in deep tapering 0028 tip cut 0028-in sheet wing assembly done way paired ribs glued LE TE spars normal fashion spreader block placed tween pair ribs bow outward cap spars glued top ribs spreader blocks removed accommodate dihedral assembly must done panel-bypanel building scheme impresses two rea sons First have observed strong end product Second basic principle pre stressing balsa bowing ribs example well-documented method increasing stiffness structure same time Warren truss approach makes ribs double duty Also visible first photo experi mental stab trailing edge relatively ro bust being 002 deep 0016 thick leading edge thinner bowed place trailing edge tension version shown has center rib two outboard ribs less stiff previous no center rib two diagonal ribs ribs meet trailing edge fan outward about halfway along leading edge side Jesse draws no partic ular conclusions about stab designs yethe still experimenting Peanuts & Pistachios time Hot off press comes P&P Volume 3 third volume fine series previous two example includes several pointers lightweight building consistent tnm tempted try addicted postal meets discussion fine points postal participation page point ers packing models Send $5 plus $150 postage packing Hannans Runway Box Escondido CA 92025 will take get No 4 started few words appreciation Bill Joan send order Gallon-jug props Cezar Banks cut wide swath Novice Pennyplane design using props formed gallon jug type prop isnt new Cezars activity helped popularize molded props Indoor again several references available dealing design set up kind prop process begins standpoint having certain prop mind continues ways helping Continued page 157 August 1988 153 new break thru high tech landing gears has set new standard years come Glass filled resin absorb landing shock memory return its original shape Three sizes fit needs 20 giant scale Cleanly machined plated axles hardened steel included Klett Landing Gears sold separately 5/32 3/16 axles come nylon bushings will adapt wheel improved operation Klett family Hinges fit need Perforated nylon best glue grab Minimum friction no mold flash Close fitting minimize play vibration flutter Klett Products recognized top designers flyers world wide See local dealer Klett Products klett Products available exclusively Gari Goldberg Models modeling enjoyment FF Indoor/Tenny Continued page 153 try choose form Now commercial prop form available making easier duplicate effective prop designs What needed way quickly choose best according ory several alternatives Handy cork form Another months pho tos shows really handy prop form sold Jim Jones As looked form developed cu riosity about pitch pitch distribution changes function three factors 1 The layout angIe 150 marked Jims block 2 The setup angle 450 typically used 3 The setup radius Cezar specified 450 angle 35-in radius What if. popular computer tools quickly examining changing possibili ties spreadsheet set up spreadshect calculate several factors Spreadsheet Symbols PS pitch corresponding setup angle AS Al blade angle inner end blade PT pitch corresponding angle Al AO angle tip P0 pitch corresponding angle AO Input data AT layout angle block RS setup radius AS setup angle advantages using spreadsheet design fast data can generated once spreadsheet template has gener ated data below generated less 20 minutes cold start computer time included review pass planning next Sample data runs following conditions fixed data presented working toward Novice Pennyplane props 112-in diameter 2 Blade length 5 1 bare spar next prop shaft Chart IVARY LAYOUT ANGLE ATRSASPS 10270345 11270345 12270345 13270345 15270345 16270345 Al 742 746 749 758 762 766 P1 222 228 234 248 256 263 AO 492 471 45 41 39 369 P0 436 406 378 327 30 283 Chart 11VARY SETUP RADIUS ATRSAS 1612570 161570 1617570 16270 1622570 162570 1627570 16370 1632570 163570 PS 216 259 302 345 388 432 475 518 561 604 Al 716 733 75 766 782 799 816 832 849 865 P1 AO 19832 209336 234352 264369 302386 353402 424419 529435 701452 103469 P0 235 251 267 284 301 319 338 358 38 402 Chart ifiVARY SETUP ANGLE ATRSASPSAlP1AO 162501556695169 16255179616116219 16260217666145269 16265269716189319 P0 115 152 192 235 16270345 161550112 161555135 161560163 161565202 161570259 766 533 583 633 683 733 264 84 102 125 158 21 369 136 186 236 286 336 283 91 127 165 206 251 Interpreting data viewing printouts read pitch distribution compare P1 PG PS Chart layout angle 130 P0 slightly less PS indicating blade has 18 pitch washout tip Similarly value P1 indicates inner blade washed out 97 pitch personal ory central part blade should design pitch slight washout toward tip fairly fast washout near hub So examples three charts have emphasized indicate particular design choice Looking trends Instead looking par ticular design layout can examine trends help decide parameters change example Chart hub washout changes somewhat pitch distribution changes severe washin moderate washout tip Chart II shows opposite trend both param eters hub washin getting out hand quickly RS increases really interesting trend occurs Chart III 15 setup radius pitch distribution changes very little 0 700 setup angle using adjustable pitch hub 15-in setup angle pitch changes changing pitch distrib ution over 50% change setup angle very useful since changing setup angle helical true pitch prop changes pitch distribu tion washin/washout same time Spreadsheet template Send $1 SASE Bud Tenny PO Box 545 Richardson TX 75080 enough info build own spread sheet Next time gallon jug props including explanation analysis method plus what ever else will fit Computer ArealFineman Continued page 67 program shown written GW-BASLC should run altera tion BASICA MBASIC additional formation contained programming guide end article Using program shape question must first described collection successive X-Y coordinates basic layout illustrated Figure 1 sta bilizer half old Scientific Douglas YO-43 has placed within graphic space marked off inches along both axes remember X horizontal Y ver tical exact placement unimportant Begin location shape mark off series points delimit se quence straight lines nearly straight lines accuracy eventual calculation will improved making locations seems law diminishing returns work need go crazy part proced ureContinued page 158 THE LEADER IN COMPETITION DIA 15 16 II NEW PRO SERIES 3 NEW HIGH TECH AIRFOIL SECTION 10T020%INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUEL PROOF HIGH LUSTER FINISH DIA PITCHPRICE 52/i 34 634 72833/o456 8334568 8/o4566/o7 9456677V2 1045667 106W8W 186EW 114677778 115W 11BEW 11o67 124W 125W 1256 1356 1456 1556 164/N 16678 RC PYLON RACING SERIES 500 DIA PITCHPRICE 7SN 5/oN 8I67A7/o8 SERIES 400C 86601o77701o 977A7Io W WIDE BLADE EW EXTRA WIDE 0M MARflW PROPELLERS CYCLE SERIES 100 THP DESIGN TAILORED HELICAL PITCH DEVELOPEDTOGIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW PITCH THP PRICE 66/o 77 8 677 /o8 6778 67 678 August 1988 157
Edition: Model Aviation - 1988/08
Page Numbers: 66, 153, 157
NEW NEWSLEflER longest-last ing FF clubs nation founded 1936 Brooklyn Sky-Scrapers has finally begun pub lish newsletter Called Flyoff currently quarterly publication intended supple ment rather compete other magazines newsletters cover FF model activity first issue held eight pages model plans comments introductory material slick pa per typeset format fully professional respectvery impressive staff editor Bob Hatschek assisted Lydia Joe Wagner Bill Colish promises technological content will get avallable space future issues price $2 per issue US $3 per issue foreign subscribers minimum subscription five sues Payment must made US funds drawn US bank payable Brooklyn Sky-Scrapers Send correspondence FLYOFF c/o Robert Hatschek 316 Grosvenor St Douglaston NY 11363 NFFS Free Flight Hall Fame Two Indoor pi oneers honored National Free Flight Society year Frank Cummings Walter Erbach Frank all-time top fliers superbly crafted flown models has largely inactive since 1966 World Cham pionships Debrecen Hungary Walt Erbach has supported Indoor active participation years has very creative imagination recent years efforts have concentrated toward developing Ornithopters led way recent upsurge Ornithopter activity performance DALMAA model kitted three years Denver Area Indoor Model Airplane Association has engaged doing public service University Colorado consists special building classes aerospace engineering fresh men followed competition finished alr craft return DAIMAA allowed use Balch Field House 40-ft ceiling door contests klt used classes P-24 Con dor Mace Model Aircraft Company 359 South 119th East Ave Tulsa OK 74128 tele phone 918/437-5490 specially engineered kit built totally inexperienced per sons minimum supervision plans carry fully detailed instructions pro fusely expertly illustrated Critical dimen sions assembly alignment other sticky details handled using jigs fixtures furn ished klt bottom line seven 80-plus models built September 1987 ses Continued page 153 66 Model Aviation Free Flight Indoor Bud Tenny Box 545 RIchardson TX 75080 Heres commercially available cork-faced gallon-jug form Indoor props Line show customary angle laying out prop blanks info column Jesse Shepherds Easy B has advanced structural features explained Buds co lumn wing ribs Below actually two-ply pieces balsa spread apart dur ing wing construction held condition being glued thin spanwise spars visIble photo prestresses balsa increasing structural rigidity Cranford himself Yet copy elusive 575 plans remains uncovered Can anyone out help us Also note fact Dan Lutz cur rently toying idea organizing re union of former modelers once flew Rosecrans Western wonder years should materialize should reunion Anyone interested such affair urged contact Dan Lutz 455 S Stage Coach Lane Fallbrook CA 92028 offer sup port Meanwhile Dan have often talked putring together Zeek article publication drawings involved could fill magazine itself mention fact holes still require plugging So recently compromised beginning se ries short segments column turn might pry loose some additional Zeek infor mation go along Anyway shall give shot think will enjoy Part II will next time October issue Till See ya downwind FF Indoor/Tenny Continued page 66 sion flew over two minutes Baich Field House Thats bad models covered Japanese tissue using relatively tiny plastic props P-24 Condor kit outstanding next step follow AMA Cub should con sidered club trying build up activity and/or train new builders Easy B advancement major prob lems competition-weight Easy B models lightweight wings usually have low torsional rigidity often makes models hair-trigger fly especially under high torque Two photos show Jesse Shepherds elegant solution problem glance first photo may lead say Warren truss diagonal ribs arent new second photo can see whats new diagonal rib dual rib bowed slightly locked place two very thin cap spars glued top ribs result very strong wingboth deflection torsion particular wing weighs same Jesses standard wing 0392 gin easily twice three times strong torsion Jesse feels ribs cap spars both stronger needed plans cut down next dimensions follows rib pair 0028-in deep cut 001-in sheet Cap spar 005-in deep cut 0008in sheet LE TE 007-in deep tapering 0028 tip cut 0028-in sheet wing assembly done way paired ribs glued LE TE spars normal fashion spreader block placed tween pair ribs bow outward cap spars glued top ribs spreader blocks removed accommodate dihedral assembly must done panel-bypanel building scheme impresses two rea sons First have observed strong end product Second basic principle pre stressing balsa bowing ribs example well-documented method increasing stiffness structure same time Warren truss approach makes ribs double duty Also visible first photo experi mental stab trailing edge relatively ro bust being 002 deep 0016 thick leading edge thinner bowed place trailing edge tension version shown has center rib two outboard ribs less stiff previous no center rib two diagonal ribs ribs meet trailing edge fan outward about halfway along leading edge side Jesse draws no partic ular conclusions about stab designs yethe still experimenting Peanuts & Pistachios time Hot off press comes P&P Volume 3 third volume fine series previous two example includes several pointers lightweight building consistent tnm tempted try addicted postal meets discussion fine points postal participation page point ers packing models Send $5 plus $150 postage packing Hannans Runway Box Escondido CA 92025 will take get No 4 started few words appreciation Bill Joan send order Gallon-jug props Cezar Banks cut wide swath Novice Pennyplane design using props formed gallon jug type prop isnt new Cezars activity helped popularize molded props Indoor again several references available dealing design set up kind prop process begins standpoint having certain prop mind continues ways helping Continued page 157 August 1988 153 new break thru high tech landing gears has set new standard years come Glass filled resin absorb landing shock memory return its original shape Three sizes fit needs 20 giant scale Cleanly machined plated axles hardened steel included Klett Landing Gears sold separately 5/32 3/16 axles come nylon bushings will adapt wheel improved operation Klett family Hinges fit need Perforated nylon best glue grab Minimum friction no mold flash Close fitting minimize play vibration flutter Klett Products recognized top designers flyers world wide See local dealer Klett Products klett Products available exclusively Gari Goldberg Models modeling enjoyment FF Indoor/Tenny Continued page 153 try choose form Now commercial prop form available making easier duplicate effective prop designs What needed way quickly choose best according ory several alternatives Handy cork form Another months pho tos shows really handy prop form sold Jim Jones As looked form developed cu riosity about pitch pitch distribution changes function three factors 1 The layout angIe 150 marked Jims block 2 The setup angle 450 typically used 3 The setup radius Cezar specified 450 angle 35-in radius What if. popular computer tools quickly examining changing possibili ties spreadsheet set up spreadshect calculate several factors Spreadsheet Symbols PS pitch corresponding setup angle AS Al blade angle inner end blade PT pitch corresponding angle Al AO angle tip P0 pitch corresponding angle AO Input data AT layout angle block RS setup radius AS setup angle advantages using spreadsheet design fast data can generated once spreadsheet template has gener ated data below generated less 20 minutes cold start computer time included review pass planning next Sample data runs following conditions fixed data presented working toward Novice Pennyplane props 112-in diameter 2 Blade length 5 1 bare spar next prop shaft Chart IVARY LAYOUT ANGLE ATRSASPS 10270345 11270345 12270345 13270345 15270345 16270345 Al 742 746 749 758 762 766 P1 222 228 234 248 256 263 AO 492 471 45 41 39 369 P0 436 406 378 327 30 283 Chart 11VARY SETUP RADIUS ATRSAS 1612570 161570 1617570 16270 1622570 162570 1627570 16370 1632570 163570 PS 216 259 302 345 388 432 475 518 561 604 Al 716 733 75 766 782 799 816 832 849 865 P1 AO 19832 209336 234352 264369 302386 353402 424419 529435 701452 103469 P0 235 251 267 284 301 319 338 358 38 402 Chart ifiVARY SETUP ANGLE ATRSASPSAlP1AO 162501556695169 16255179616116219 16260217666145269 16265269716189319 P0 115 152 192 235 16270345 161550112 161555135 161560163 161565202 161570259 766 533 583 633 683 733 264 84 102 125 158 21 369 136 186 236 286 336 283 91 127 165 206 251 Interpreting data viewing printouts read pitch distribution compare P1 PG PS Chart layout angle 130 P0 slightly less PS indicating blade has 18 pitch washout tip Similarly value P1 indicates inner blade washed out 97 pitch personal ory central part blade should design pitch slight washout toward tip fairly fast washout near hub So examples three charts have emphasized indicate particular design choice Looking trends Instead looking par ticular design layout can examine trends help decide parameters change example Chart hub washout changes somewhat pitch distribution changes severe washin moderate washout tip Chart II shows opposite trend both param eters hub washin getting out hand quickly RS increases really interesting trend occurs Chart III 15 setup radius pitch distribution changes very little 0 700 setup angle using adjustable pitch hub 15-in setup angle pitch changes changing pitch distrib ution over 50% change setup angle very useful since changing setup angle helical true pitch prop changes pitch distribu tion washin/washout same time Spreadsheet template Send $1 SASE Bud Tenny PO Box 545 Richardson TX 75080 enough info build own spread sheet Next time gallon jug props including explanation analysis method plus what ever else will fit Computer ArealFineman Continued page 67 program shown written GW-BASLC should run altera tion BASICA MBASIC additional formation contained programming guide end article Using program shape question must first described collection successive X-Y coordinates basic layout illustrated Figure 1 sta bilizer half old Scientific Douglas YO-43 has placed within graphic space marked off inches along both axes remember X horizontal Y ver tical exact placement unimportant Begin location shape mark off series points delimit se quence straight lines nearly straight lines accuracy eventual calculation will improved making locations seems law diminishing returns work need go crazy part proced ureContinued page 158 THE LEADER IN COMPETITION DIA 15 16 II NEW PRO SERIES 3 NEW HIGH TECH AIRFOIL SECTION 10T020%INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUEL PROOF HIGH LUSTER FINISH DIA PITCHPRICE 52/i 34 634 72833/o456 8334568 8/o4566/o7 9456677V2 1045667 106W8W 186EW 114677778 115W 11BEW 11o67 124W 125W 1256 1356 1456 1556 164/N 16678 RC PYLON RACING SERIES 500 DIA PITCHPRICE 7SN 5/oN 8I67A7/o8 SERIES 400C 86601o77701o 977A7Io W WIDE BLADE EW EXTRA WIDE 0M MARflW PROPELLERS CYCLE SERIES 100 THP DESIGN TAILORED HELICAL PITCH DEVELOPEDTOGIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW PITCH THP PRICE 66/o 77 8 677 /o8 6778 67 678 August 1988 157
Edition: Model Aviation - 1988/08
Page Numbers: 66, 153, 157
NEW NEWSLEflER longest-last ing FF clubs nation founded 1936 Brooklyn Sky-Scrapers has finally begun pub lish newsletter Called Flyoff currently quarterly publication intended supple ment rather compete other magazines newsletters cover FF model activity first issue held eight pages model plans comments introductory material slick pa per typeset format fully professional respectvery impressive staff editor Bob Hatschek assisted Lydia Joe Wagner Bill Colish promises technological content will get avallable space future issues price $2 per issue US $3 per issue foreign subscribers minimum subscription five sues Payment must made US funds drawn US bank payable Brooklyn Sky-Scrapers Send correspondence FLYOFF c/o Robert Hatschek 316 Grosvenor St Douglaston NY 11363 NFFS Free Flight Hall Fame Two Indoor pi oneers honored National Free Flight Society year Frank Cummings Walter Erbach Frank all-time top fliers superbly crafted flown models has largely inactive since 1966 World Cham pionships Debrecen Hungary Walt Erbach has supported Indoor active participation years has very creative imagination recent years efforts have concentrated toward developing Ornithopters led way recent upsurge Ornithopter activity performance DALMAA model kitted three years Denver Area Indoor Model Airplane Association has engaged doing public service University Colorado consists special building classes aerospace engineering fresh men followed competition finished alr craft return DAIMAA allowed use Balch Field House 40-ft ceiling door contests klt used classes P-24 Con dor Mace Model Aircraft Company 359 South 119th East Ave Tulsa OK 74128 tele phone 918/437-5490 specially engineered kit built totally inexperienced per sons minimum supervision plans carry fully detailed instructions pro fusely expertly illustrated Critical dimen sions assembly alignment other sticky details handled using jigs fixtures furn ished klt bottom line seven 80-plus models built September 1987 ses Continued page 153 66 Model Aviation Free Flight Indoor Bud Tenny Box 545 RIchardson TX 75080 Heres commercially available cork-faced gallon-jug form Indoor props Line show customary angle laying out prop blanks info column Jesse Shepherds Easy B has advanced structural features explained Buds co lumn wing ribs Below actually two-ply pieces balsa spread apart dur ing wing construction held condition being glued thin spanwise spars visIble photo prestresses balsa increasing structural rigidity Cranford himself Yet copy elusive 575 plans remains uncovered Can anyone out help us Also note fact Dan Lutz cur rently toying idea organizing re union of former modelers once flew Rosecrans Western wonder years should materialize should reunion Anyone interested such affair urged contact Dan Lutz 455 S Stage Coach Lane Fallbrook CA 92028 offer sup port Meanwhile Dan have often talked putring together Zeek article publication drawings involved could fill magazine itself mention fact holes still require plugging So recently compromised beginning se ries short segments column turn might pry loose some additional Zeek infor mation go along Anyway shall give shot think will enjoy Part II will next time October issue Till See ya downwind FF Indoor/Tenny Continued page 66 sion flew over two minutes Baich Field House Thats bad models covered Japanese tissue using relatively tiny plastic props P-24 Condor kit outstanding next step follow AMA Cub should con sidered club trying build up activity and/or train new builders Easy B advancement major prob lems competition-weight Easy B models lightweight wings usually have low torsional rigidity often makes models hair-trigger fly especially under high torque Two photos show Jesse Shepherds elegant solution problem glance first photo may lead say Warren truss diagonal ribs arent new second photo can see whats new diagonal rib dual rib bowed slightly locked place two very thin cap spars glued top ribs result very strong wingboth deflection torsion particular wing weighs same Jesses standard wing 0392 gin easily twice three times strong torsion Jesse feels ribs cap spars both stronger needed plans cut down next dimensions follows rib pair 0028-in deep cut 001-in sheet Cap spar 005-in deep cut 0008in sheet LE TE 007-in deep tapering 0028 tip cut 0028-in sheet wing assembly done way paired ribs glued LE TE spars normal fashion spreader block placed tween pair ribs bow outward cap spars glued top ribs spreader blocks removed accommodate dihedral assembly must done panel-bypanel building scheme impresses two rea sons First have observed strong end product Second basic principle pre stressing balsa bowing ribs example well-documented method increasing stiffness structure same time Warren truss approach makes ribs double duty Also visible first photo experi mental stab trailing edge relatively ro bust being 002 deep 0016 thick leading edge thinner bowed place trailing edge tension version shown has center rib two outboard ribs less stiff previous no center rib two diagonal ribs ribs meet trailing edge fan outward about halfway along leading edge side Jesse draws no partic ular conclusions about stab designs yethe still experimenting Peanuts & Pistachios time Hot off press comes P&P Volume 3 third volume fine series previous two example includes several pointers lightweight building consistent tnm tempted try addicted postal meets discussion fine points postal participation page point ers packing models Send $5 plus $150 postage packing Hannans Runway Box Escondido CA 92025 will take get No 4 started few words appreciation Bill Joan send order Gallon-jug props Cezar Banks cut wide swath Novice Pennyplane design using props formed gallon jug type prop isnt new Cezars activity helped popularize molded props Indoor again several references available dealing design set up kind prop process begins standpoint having certain prop mind continues ways helping Continued page 157 August 1988 153 new break thru high tech landing gears has set new standard years come Glass filled resin absorb landing shock memory return its original shape Three sizes fit needs 20 giant scale Cleanly machined plated axles hardened steel included Klett Landing Gears sold separately 5/32 3/16 axles come nylon bushings will adapt wheel improved operation Klett family Hinges fit need Perforated nylon best glue grab Minimum friction no mold flash Close fitting minimize play vibration flutter Klett Products recognized top designers flyers world wide See local dealer Klett Products klett Products available exclusively Gari Goldberg Models modeling enjoyment FF Indoor/Tenny Continued page 153 try choose form Now commercial prop form available making easier duplicate effective prop designs What needed way quickly choose best according ory several alternatives Handy cork form Another months pho tos shows really handy prop form sold Jim Jones As looked form developed cu riosity about pitch pitch distribution changes function three factors 1 The layout angIe 150 marked Jims block 2 The setup angle 450 typically used 3 The setup radius Cezar specified 450 angle 35-in radius What if. popular computer tools quickly examining changing possibili ties spreadsheet set up spreadshect calculate several factors Spreadsheet Symbols PS pitch corresponding setup angle AS Al blade angle inner end blade PT pitch corresponding angle Al AO angle tip P0 pitch corresponding angle AO Input data AT layout angle block RS setup radius AS setup angle advantages using spreadsheet design fast data can generated once spreadsheet template has gener ated data below generated less 20 minutes cold start computer time included review pass planning next Sample data runs following conditions fixed data presented working toward Novice Pennyplane props 112-in diameter 2 Blade length 5 1 bare spar next prop shaft Chart IVARY LAYOUT ANGLE ATRSASPS 10270345 11270345 12270345 13270345 15270345 16270345 Al 742 746 749 758 762 766 P1 222 228 234 248 256 263 AO 492 471 45 41 39 369 P0 436 406 378 327 30 283 Chart 11VARY SETUP RADIUS ATRSAS 1612570 161570 1617570 16270 1622570 162570 1627570 16370 1632570 163570 PS 216 259 302 345 388 432 475 518 561 604 Al 716 733 75 766 782 799 816 832 849 865 P1 AO 19832 209336 234352 264369 302386 353402 424419 529435 701452 103469 P0 235 251 267 284 301 319 338 358 38 402 Chart ifiVARY SETUP ANGLE ATRSASPSAlP1AO 162501556695169 16255179616116219 16260217666145269 16265269716189319 P0 115 152 192 235 16270345 161550112 161555135 161560163 161565202 161570259 766 533 583 633 683 733 264 84 102 125 158 21 369 136 186 236 286 336 283 91 127 165 206 251 Interpreting data viewing printouts read pitch distribution compare P1 PG PS Chart layout angle 130 P0 slightly less PS indicating blade has 18 pitch washout tip Similarly value P1 indicates inner blade washed out 97 pitch personal ory central part blade should design pitch slight washout toward tip fairly fast washout near hub So examples three charts have emphasized indicate particular design choice Looking trends Instead looking par ticular design layout can examine trends help decide parameters change example Chart hub washout changes somewhat pitch distribution changes severe washin moderate washout tip Chart II shows opposite trend both param eters hub washin getting out hand quickly RS increases really interesting trend occurs Chart III 15 setup radius pitch distribution changes very little 0 700 setup angle using adjustable pitch hub 15-in setup angle pitch changes changing pitch distrib ution over 50% change setup angle very useful since changing setup angle helical true pitch prop changes pitch distribu tion washin/washout same time Spreadsheet template Send $1 SASE Bud Tenny PO Box 545 Richardson TX 75080 enough info build own spread sheet Next time gallon jug props including explanation analysis method plus what ever else will fit Computer ArealFineman Continued page 67 program shown written GW-BASLC should run altera tion BASICA MBASIC additional formation contained programming guide end article Using program shape question must first described collection successive X-Y coordinates basic layout illustrated Figure 1 sta bilizer half old Scientific Douglas YO-43 has placed within graphic space marked off inches along both axes remember X horizontal Y ver tical exact placement unimportant Begin location shape mark off series points delimit se quence straight lines nearly straight lines accuracy eventual calculation will improved making locations seems law diminishing returns work need go crazy part proced ureContinued page 158 THE LEADER IN COMPETITION DIA 15 16 II NEW PRO SERIES 3 NEW HIGH TECH AIRFOIL SECTION 10T020%INCREASE IN THRUST MFG OF SELECT HARD MAPLE WOOD WILL NOT FATIGUE LIKE SYNTHETICS FUEL PROOF HIGH LUSTER FINISH DIA PITCHPRICE 52/i 34 634 72833/o456 8334568 8/o4566/o7 9456677V2 1045667 106W8W 186EW 114677778 115W 11BEW 11o67 124W 125W 1256 1356 1456 1556 164/N 16678 RC PYLON RACING SERIES 500 DIA PITCHPRICE 7SN 5/oN 8I67A7/o8 SERIES 400C 86601o77701o 977A7Io W WIDE BLADE EW EXTRA WIDE 0M MARflW PROPELLERS CYCLE SERIES 100 THP DESIGN TAILORED HELICAL PITCH DEVELOPEDTOGIVE MAXIMUM THRUST AT 4 CYCLE ENGINE RPM ALL THE LATEST TECHNIQUES USED ON OUR PRO SERIES 3 SEE BELOW PITCH THP PRICE 66/o 77 8 677 /o8 6778 67 678 August 1988 157