0JOCAbWIO5 tt3IA aI N 4IA aI C 0 -I ctj~U wicm ICR-lw V-AXIS ci C x IA ci rO 4 S z S -z z 1E C ~-Th ~, C - ~ o o000C C0O 0 o C - -C 2 2o -t 0C0CC0C0 0- 0o o C C 0 C 0- E 0-g 0- I C C 0 0 0 0 t 0C0 o E CC C 0 00 OCO O-C- t0 0C0 -l CC0C0t-- Io~ 0 00~ - -~ C- S - 0C-~ - C0 002C cQ i C1C 0NC 0 -C 0 -~C9 - 0 C- 0 000-0 2 o 0 o-0- 0 C -t C C 0 NO o C C - % 0 2 2 ~CN 0 C C 0 C o- 0 2 00- 0--C 0 o-tC O 0 -t 0- 00 0 C 0CI40 000 C05. 00C DY U -Oi 0 -q 0 0 0 -o CD -I 0 0 CD 0 CD 11111111 1111111 III iigill iinniiflI CII 00 5 0C mu. C 0- C 0 00C0- 11 0 0-02 EQit C-t11111111 0-0 11111111 C ~ III HI 011111 o _ 0I11111 C0 0- 0 "iii CC0 InIaIIIIi iii 111111 tttitt "II" 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 E~uuuEEEEEEEEE EEEUN inininuinuuuuuuininininin 519 GLOW FUEL MANUFACTURED WITH THE PUREST FINEST QUALITY INGREDIENTS AVAILABLE * Superior Igniters- Improve starting idle acceleration Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed SIG CHAMPION 2-STROKE FUEL FREIGHT FREE SHIPPINGON ORDERS OVER$1500 ECT PINT QUARTGALLON55 GAL DRUM 0% Ntremethane 50$Q75$19695 5% Nitromethane $1275$26495 10% Nitromethane $415 $ 5014 75$32995 15% Nitromethan $43c$35$1675$38995 25% Nitromethane $515 S5$L95$52495 35% Nitromethane $5 95 $925$2695$66995 SIG PREMIUM 4-STROKE FUEL 10% Nitromethane$1425$29995 15% Nitromethane$1625I$36495 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending finest quality model engine fuel available using finest quality ingredients instance Methanol use 995% pure very best grade money can buy also use real 100% pure Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tain 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourselfPiCOS Sobled change wttVot notiCO See dealer first available order direct Call IJ 800-247-5008 toll free orders Latest Catalog $300 SIG MANUFACTURING CO Montezuma IA 50171 program allows maximum 50 lo cations per program run should enough locations assigned horizontal X vertical Y value easiest quickest way to draw shape tracing paper place tracing top graph paper ruled millimeters tenthsof-an-inch sake clarity inch subdivisions shown Figure 1 used original plot stabilizer outline Figure 1 might well have somewhat smaller since would normally plot part flying surface actually accounts lift area contained within fuse lage have found takes relatively lit tle time plotting X-Y coordi nates just few minutes curved surfaces Once X-Y locations have fig ured run program enter coordi nates Note program first asks total number locations first X-Y location included twice once first location again last illustrated Figure 1 program includes error trap certain have followed convention dont program will dump out make re-enter data again Just take time entering coordi nates checking along way avoid typ ing errors Finally program BASIC code listing Figure 2 will supply square area form screen ask user wants printout should help ful since printout also summarizes X-Y coordinates user should check against original plotted values accuracy programs printout stabilizer shape drawn Figure 1 shown Figure 3 Programming guide have never created used BASIC language pro gram just follow easy steps outlined below program described arti cle written IBM-PC family computers including work-alike clones Ill assume know start up computer installing MS-DOS PC-DOS operating system Ill also assume machine has two floppy disk drives common con figuration Note Users other computer brands such Apple Commodore will have translate program BASIC language variation used computers task beyond scope article Step 1 ating system disk drive replace BASIC language disk such GW-BASIC Youll want keep finished program sep arate disk place formatted diskette drive B time Step 2 BASIC disk drive enter GW-BASIC its equivalent after prompt press return will bring programming environ ment Step 3 Enter word NEW indicate new program press return com puter will respond OK Now type pro gram exactly appears Figure 2 Press return key end line order go next line certain keep spacing punctuation marks precisely appear Figure 2 Step 4 After program has typed press return once again enter fol lowing message SAVE BAREABAS include quotation marks will store completed program disk lo cated B drive under name AREABAS can use future occasions want try program time just enter RUN press return Step 5 use program later date once again load BASIC programming language drive program disk should B enter LOAD BAREABAS include quotation marks press return after pro gram loads enter RUN begin CO-2 Komet/Lidberg Continued page 69 pieces attach motor mount Locate charge fitting just behind 158 Model Aviation
Edition: Model Aviation - 1988/08
Page Numbers: 67, 157, 158
0JOCAbWIO5 tt3IA aI N 4IA aI C 0 -I ctj~U wicm ICR-lw V-AXIS ci C x IA ci rO 4 S z S -z z 1E C ~-Th ~, C - ~ o o000C C0O 0 o C - -C 2 2o -t 0C0CC0C0 0- 0o o C C 0 C 0- E 0-g 0- I C C 0 0 0 0 t 0C0 o E CC C 0 00 OCO O-C- t0 0C0 -l CC0C0t-- Io~ 0 00~ - -~ C- S - 0C-~ - C0 002C cQ i C1C 0NC 0 -C 0 -~C9 - 0 C- 0 000-0 2 o 0 o-0- 0 C -t C C 0 NO o C C - % 0 2 2 ~CN 0 C C 0 C o- 0 2 00- 0--C 0 o-tC O 0 -t 0- 00 0 C 0CI40 000 C05. 00C DY U -Oi 0 -q 0 0 0 -o CD -I 0 0 CD 0 CD 11111111 1111111 III iigill iinniiflI CII 00 5 0C mu. C 0- C 0 00C0- 11 0 0-02 EQit C-t11111111 0-0 11111111 C ~ III HI 011111 o _ 0I11111 C0 0- 0 "iii CC0 InIaIIIIi iii 111111 tttitt "II" 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 E~uuuEEEEEEEEE EEEUN inininuinuuuuuuininininin 519 GLOW FUEL MANUFACTURED WITH THE PUREST FINEST QUALITY INGREDIENTS AVAILABLE * Superior Igniters- Improve starting idle acceleration Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed SIG CHAMPION 2-STROKE FUEL FREIGHT FREE SHIPPINGON ORDERS OVER$1500 ECT PINT QUARTGALLON55 GAL DRUM 0% Ntremethane 50$Q75$19695 5% Nitromethane $1275$26495 10% Nitromethane $415 $ 5014 75$32995 15% Nitromethan $43c$35$1675$38995 25% Nitromethane $515 S5$L95$52495 35% Nitromethane $5 95 $925$2695$66995 SIG PREMIUM 4-STROKE FUEL 10% Nitromethane$1425$29995 15% Nitromethane$1625I$36495 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending finest quality model engine fuel available using finest quality ingredients instance Methanol use 995% pure very best grade money can buy also use real 100% pure Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tain 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourselfPiCOS Sobled change wttVot notiCO See dealer first available order direct Call IJ 800-247-5008 toll free orders Latest Catalog $300 SIG MANUFACTURING CO Montezuma IA 50171 program allows maximum 50 lo cations per program run should enough locations assigned horizontal X vertical Y value easiest quickest way to draw shape tracing paper place tracing top graph paper ruled millimeters tenthsof-an-inch sake clarity inch subdivisions shown Figure 1 used original plot stabilizer outline Figure 1 might well have somewhat smaller since would normally plot part flying surface actually accounts lift area contained within fuse lage have found takes relatively lit tle time plotting X-Y coordi nates just few minutes curved surfaces Once X-Y locations have fig ured run program enter coordi nates Note program first asks total number locations first X-Y location included twice once first location again last illustrated Figure 1 program includes error trap certain have followed convention dont program will dump out make re-enter data again Just take time entering coordi nates checking along way avoid typ ing errors Finally program BASIC code listing Figure 2 will supply square area form screen ask user wants printout should help ful since printout also summarizes X-Y coordinates user should check against original plotted values accuracy programs printout stabilizer shape drawn Figure 1 shown Figure 3 Programming guide have never created used BASIC language pro gram just follow easy steps outlined below program described arti cle written IBM-PC family computers including work-alike clones Ill assume know start up computer installing MS-DOS PC-DOS operating system Ill also assume machine has two floppy disk drives common con figuration Note Users other computer brands such Apple Commodore will have translate program BASIC language variation used computers task beyond scope article Step 1 ating system disk drive replace BASIC language disk such GW-BASIC Youll want keep finished program sep arate disk place formatted diskette drive B time Step 2 BASIC disk drive enter GW-BASIC its equivalent after prompt press return will bring programming environ ment Step 3 Enter word NEW indicate new program press return com puter will respond OK Now type pro gram exactly appears Figure 2 Press return key end line order go next line certain keep spacing punctuation marks precisely appear Figure 2 Step 4 After program has typed press return once again enter fol lowing message SAVE BAREABAS include quotation marks will store completed program disk lo cated B drive under name AREABAS can use future occasions want try program time just enter RUN press return Step 5 use program later date once again load BASIC programming language drive program disk should B enter LOAD BAREABAS include quotation marks press return after pro gram loads enter RUN begin CO-2 Komet/Lidberg Continued page 69 pieces attach motor mount Locate charge fitting just behind 158 Model Aviation
Edition: Model Aviation - 1988/08
Page Numbers: 67, 157, 158
0JOCAbWIO5 tt3IA aI N 4IA aI C 0 -I ctj~U wicm ICR-lw V-AXIS ci C x IA ci rO 4 S z S -z z 1E C ~-Th ~, C - ~ o o000C C0O 0 o C - -C 2 2o -t 0C0CC0C0 0- 0o o C C 0 C 0- E 0-g 0- I C C 0 0 0 0 t 0C0 o E CC C 0 00 OCO O-C- t0 0C0 -l CC0C0t-- Io~ 0 00~ - -~ C- S - 0C-~ - C0 002C cQ i C1C 0NC 0 -C 0 -~C9 - 0 C- 0 000-0 2 o 0 o-0- 0 C -t C C 0 NO o C C - % 0 2 2 ~CN 0 C C 0 C o- 0 2 00- 0--C 0 o-tC O 0 -t 0- 00 0 C 0CI40 000 C05. 00C DY U -Oi 0 -q 0 0 0 -o CD -I 0 0 CD 0 CD 11111111 1111111 III iigill iinniiflI CII 00 5 0C mu. C 0- C 0 00C0- 11 0 0-02 EQit C-t11111111 0-0 11111111 C ~ III HI 011111 o _ 0I11111 C0 0- 0 "iii CC0 InIaIIIIi iii 111111 tttitt "II" 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 E~uuuEEEEEEEEE EEEUN inininuinuuuuuuininininin 519 GLOW FUEL MANUFACTURED WITH THE PUREST FINEST QUALITY INGREDIENTS AVAILABLE * Superior Igniters- Improve starting idle acceleration Youll notice power bargain fuels * Special Detergents Promote clean burning prevent residue buildup * Rust Inhibitors Protect engines corrosion After run oil needed engines * Film Strength Additives Increase lubricity provide extra lean run protection * Anti-Wear Additives Help keep engines running peak performance longer * Satisfaction Guaranteed SIG CHAMPION 2-STROKE FUEL FREIGHT FREE SHIPPINGON ORDERS OVER$1500 ECT PINT QUARTGALLON55 GAL DRUM 0% Ntremethane 50$Q75$19695 5% Nitromethane $1275$26495 10% Nitromethane $415 $ 5014 75$32995 15% Nitromethan $43c$35$1675$38995 25% Nitromethane $515 S5$L95$52495 35% Nitromethane $5 95 $925$2695$66995 SIG PREMIUM 4-STROKE FUEL 10% Nitromethane$1425$29995 15% Nitromethane$1625I$36495 THE CHOICE OF CHAMPION FLYERS over 20 years SIG has blending finest quality model engine fuel available using finest quality ingredients instance Methanol use 995% pure very best grade money can buy also use real 100% pure Nitromethane get full measure youve paid based honest percentage-of-volume method percentage weight SIG fuels con tain 50-50 blend Bakers purest AA Castor Oil new improved Klotz Techniplate Synthetic Racing Oil maximum engine lubrication protection Based experience sincerely believe finest quality fuel can made price dont take word try some judge yourselfPiCOS Sobled change wttVot notiCO See dealer first available order direct Call IJ 800-247-5008 toll free orders Latest Catalog $300 SIG MANUFACTURING CO Montezuma IA 50171 program allows maximum 50 lo cations per program run should enough locations assigned horizontal X vertical Y value easiest quickest way to draw shape tracing paper place tracing top graph paper ruled millimeters tenthsof-an-inch sake clarity inch subdivisions shown Figure 1 used original plot stabilizer outline Figure 1 might well have somewhat smaller since would normally plot part flying surface actually accounts lift area contained within fuse lage have found takes relatively lit tle time plotting X-Y coordi nates just few minutes curved surfaces Once X-Y locations have fig ured run program enter coordi nates Note program first asks total number locations first X-Y location included twice once first location again last illustrated Figure 1 program includes error trap certain have followed convention dont program will dump out make re-enter data again Just take time entering coordi nates checking along way avoid typ ing errors Finally program BASIC code listing Figure 2 will supply square area form screen ask user wants printout should help ful since printout also summarizes X-Y coordinates user should check against original plotted values accuracy programs printout stabilizer shape drawn Figure 1 shown Figure 3 Programming guide have never created used BASIC language pro gram just follow easy steps outlined below program described arti cle written IBM-PC family computers including work-alike clones Ill assume know start up computer installing MS-DOS PC-DOS operating system Ill also assume machine has two floppy disk drives common con figuration Note Users other computer brands such Apple Commodore will have translate program BASIC language variation used computers task beyond scope article Step 1 ating system disk drive replace BASIC language disk such GW-BASIC Youll want keep finished program sep arate disk place formatted diskette drive B time Step 2 BASIC disk drive enter GW-BASIC its equivalent after prompt press return will bring programming environ ment Step 3 Enter word NEW indicate new program press return com puter will respond OK Now type pro gram exactly appears Figure 2 Press return key end line order go next line certain keep spacing punctuation marks precisely appear Figure 2 Step 4 After program has typed press return once again enter fol lowing message SAVE BAREABAS include quotation marks will store completed program disk lo cated B drive under name AREABAS can use future occasions want try program time just enter RUN press return Step 5 use program later date once again load BASIC programming language drive program disk should B enter LOAD BAREABAS include quotation marks press return after pro gram loads enter RUN begin CO-2 Komet/Lidberg Continued page 69 pieces attach motor mount Locate charge fitting just behind 158 Model Aviation