Duralion f0 Bob Meuser THE PENNY-BIPES Such isnt oftenand perhaps fact first 7 44 /7 / 6 / / 4L 4 8 4L 4 li-I 4 -ff theoretical treatment some aspect free-flight technology leads di 51 ~1 / / $ 4 4 43 degned by1-buAkLeag AMA t ajid Cat IIT 4Ojen reards bil %/ohn ksot 3 rectly success competition thats way current crop biplane Pennyplanes analysis Doug McLean con sidered biplane tandem configura tions comparison conventional layouts various indoor competition classes Tandems came out slight edge hardly enough bother biplanes came out 30% edge curious result Dougs analysis ever flight-duration potential depends very little upon wing chord over range chords considered results presented paper 1976 NFFS Symposium Report Biplane Pennyplanes have tried before no great success have right means getting wings far enough apart arent flying others downwash Although considered Dougs analy sis getting wings up high helps too drag wings puts load horizontal tail Presumably would apply monoplanes well However Clarence Mather has achieved great success wing mounted close fuselage may small effect subject competing factors McLean achieved high degree suc cess own biplane hands John Kukon design set both Category Category III Open rec ords Another biplane considerably differ ent McLean design detail adhering basic principles built Dennis Jaecks set Category II Open record Although Cat record has subsequently beaten monoplane 30% margin predicted McLean yet realized seems clear that potential can achieved given suffi cient time effort development Although havent addressed ques tion previously magazine has 52 Model Aviation 4 Pennyplane biplane Doug Mclean John Kukon currently holds Category Ill record / strong feeling Erv Rodemsky originated Pennyplane event both Pennyplane Novice Pennyplane should limited monoplanes An official rules change proposal effect currently before F/F Contest Board opposed proposed rules change contend Novice Pennyplane serves required role beginners event Pennyplane should free monoplanes-only restriction permit further experimentation development contention biplane re quires sorts construction han dling skills put event hands experienced indoor modelers familiar ultra-light con struction techniques Building two halfgram wings handling required indoor techniques building one-gram wing no sweat outdoor modeler puts mind event never intended indoor modelers exclusively sure experts will eventu ally dominate eventanything else would mere lottery competition experts would likely drawn outdoor free-flight community indoor group provided event limited monoplanes Besides event supposed simple models difficult see biplane can considered simple easy build equiva lent monoplane Novice Pennyplane its further restrictions construction prop diameter chord ideal ginners event Well soon know comes out event development bi plane Pennyplane should recognized outstanding achievement Anyone triplanes Puncture Wounds Getting few holes poked covering weeds sage brush gremlins armed pointy sticks inevitable part free-flight modeling ignored rather healing themselves tend grow worse usual quick-fix field repair squirt glue over wound leads creased weight wrinkles ugliness small punctures Bob Sylvester carries along supply tissue dots various colors Fold scrap tissue five times push X-Acto -inch punch through stack presto 32 dots smaller dots use pliers-type paper punch get cleaner job sand wich few sheets tissue between sheets bond paper Place dot over wound apply drop thinnernot dope back business neat permanent repair Slits too large covered single reflective mood Bob deShields seems willing original Drifter A-i towline model put up another good flight deemed worthy some very nice trim decorations 6 4 5 1 t / g 7 5 3 BIPLAt2E PEfl12jPUflE Dennis Jaecks 13 420 Open Cat Iii Airjiit zrs arc. 2 Front iieiv // f0 February 1978 53 Prop 17 dia ez- pitch %lotor 098x id 1450 turns dot can repaired using string dots slits inch length usually submit best application plain old model airplane cement par ticularly ragged wound Some near middle slit somehow tweak tissue opposite sides wound near contact using tweezers pins whatever suits apply small drop glue As glue dries pulls wound closed Apply few dabs glue after first nearly dry grad ually stitch sides together Finally apply glue over whole length wound wipe off excess teeny-finger wait until skin forms Better still have time apply small strips tissue over wound after stitched few years back witnessed what must ultimate cool-headedness After waiting quite awhile thermal flier started engine B-Gas Starduster planted VTO position just ready let go thumb went through wing covering producing 4-inch tear Without shutting down engine whipped trusty glue gun its holster shot wound full glue launched prepared emergency ceases exist Rumor Mill year ago hot rumor Cox going discontinue pro duction Tee Dee 020 would have killed Payload Cargo 020 Oldtimer events didnt happen current rumors making rounds Cox going discontinue Tee Dee 020 its low-sales-volume free-flight engines cluding Tee Dees 010 051 09 Conquest 15 According Coxs Customer Service Department entirely correct Tee Dee 010 will dropped line others Thats good news bad news hot 40 en gine few prototypes made large splash competition scene 1976 will go production course Cox could always change its corporate mind Nominations Are Now Order have back murky depths headbone candidate two mind NFFS Model Year award try harder tell Anthony Italiano about address 1655 Rever Dr Brookfield WI 53005 Models consideration Continued page 96 Virgil Coker dare different C Gas pylonless ST 35-pow ered job angled wing stab respect fuselage such manner retained pylon effect Sketch profile pylon ship draw fuselage wing stab position youll get idea high thrust line comes naturallyracey look ing wed say 3 I 4 ft1 Th Font 7/jew /7 /7 7 4 / 24 2 f 7 3 143~1 / f rAfl1EtI2 PEPt2JPLM2 L Do44cLea 54 Model Aviation 4 shell spar will butt against spar use toothpicks align hold spar same stabilizer Use glass cloth around spar added strength several layers glass cloth paint tails of airplanes because weight build up possibility warping tail surface sealed epoxy glue rubbed wood unpainted wood surfaces Fuel Tank suction fuel system very simple should provide very constant engine runs tank itself can easily made 010 tin can ordered John Newton Speed Racing Products completely assembled ready bolt airplane Takeoff Dolly Any three-wheel dolly front wheel spread close wing span should prove satisfactory lift-out type two guide pins extending two three inches above wingone mid-wing other close fuse lage Some weight might needed close outboard wheel just depends dolly design Engines Fuel Props use essentially stock Rossi Rear Rotor 15s Except bar stock head engine stock use bar-stock head save price Rossi inserts Rossi insert faster can keep element whole run stock Rossi stock 6-7 Rev-Up prop 65% nitro can very consistently put 162-mph bracket nitro Rossi pipe short will go 170 mph range achievable consistently standard fuel mix used usually 65-75% nitro 20% oils rest alco hol have always used least 5%-10% castor oil fuel other oil content being synthetic oil Rev-Up 6-7 prop seems about right 65-75% nitro fuel weather conditions dont stop Experiment Flying The airplane very smooth flying should present no real problems takeoff run hold some down elevator until flying speed approached ease neutral airplane should lift off easily Dont let airplane climb too high Keep about 5 feet have questions problems feel free contact us John Newton 2154 Los Padres Rowland Heights CA 91748 Jim Wade 1853 Yettford Rd Vista CA 92083 Stripper/Lidberg continued page 56 As example handy strip per can recently built unlimited rubber model long geodetically braced fuselage Cross braces 1/16 X 3/16 local hobby shop out size bought sheet 1/16 X 2 Using stripper made up 3/16 width 1/16 depth able cut 10 pieces 3/l6 wide piece about /8 wide left over strip square edges uniform width con struction sanding finished fuse lage simplified Looking again yield piece sheet balsa shows considerable savings can made 2 sheet cost 5l yielded 10 strips would have cost ll $110 Thats bad just few minutes work addition able finish model making extra trip search strip wood An Easy Balsa Stripper can made just size 15 20 minutes can make half dozen commonly used sizes Mark width stripper ready reference prevent throwing strippers out scrap color markers colored paint strip pers can used two ways Either way works better sheet balsa has good straight edge sure check first knife/straightedge routine maybe just sanding block can used produce straigbt-edged sheet method prefer cutting strips shown photos sheet held down left hand stripper used right hand Keep slight amount pressure toward sheet keep strips consistent width may prefer holding stripper left hand blade pointing up pushing sheet through right hand Rubbing surfaces stripper slide sheet balsa lightly small dry bar soap will speed up process small sharpening stone can used touch up blade new stripper can quickly made blade chipped too dull dont need strip balsa right now remember Easy Balsa Stripper next time need some Friday Saturday night after hobby shop closes hope youll find handy M uffler/Weber con tinued page 41 through muffler has pressure tap main body graph can seen expansion chamber supplies pressure flow-through other comparison between 10-6 9-6 Semco shows pressure given rpm 10-6 full throt tIe pressure slightly higher 9-6 testing muffler pressure manometer fuel level should higher open side U indicates muffler pressure exceeding atmospheric pressure fuel level higher muffler side U muffler has suc tion instead positive pressure solve problem try different location pressure tap get different muffler just forget about using muffler pressure muffler behaves well will show positive pressure rpm increasing higher rpm found examples graph same simple manometer setup can also used check other pressures such crankcase pressure fuel pump pres sure FF Duration/Meuser continued page 54 awards must somehow represent signifi cant contribution sport perhaps evidenced outstanding contest record under exceptional circumstan ces awards have presented models intended competition awards have made things other specific models name few Pennyplane event Rossi 15 Normale engine Peanut-Scale concept Seelig timer Old-Timer movement Both domestic foreign candidates eligible Supply much information can Xeroxes articles lists contest wins National records whatever cant supply send name designer whatever do soon Time awastin New Digest Editor Free Flight NFFS Digest known affectionately simply Digest has new editor Several fact After being editor seven months just really getting swing Keith Varnau found necessary give up job Bob Stalick Tom Hutchin son put together interim issue Lee Vicki Hines put out another Now its hands John Oldenkamp lives 654 India St San Diego CA 92101 Send him good stuff photos sketches stories articles contest results reports whatever Im sure hed appreciate receiving club newsletters too 96 Model Aviation FINE QUALITY KITS AND ACCESSORIES Qj2Ij SCALE PLASTIC KITS FLYING MODEL ACCESSORIES SCALE PILOTS INE GUNS WHEELS & WHEEL PANTS ENGINE KITS & CYLINDERS SEND SOt FOR COMPLETE CATALOG Dept MA ,18 1 PAWNEE STREET 4iLIJAMSSAN MARCOS CALIPORNIA 9 NEWf MUFF-L-IT SERIES Available B C engines E REGULAR IT REAR EX Six eight Ob reduction noise engines Proportional volumne expan sion chamber Large exhaust nozzle low back pressure Little no loss power No 33109IN$749 No 3022940tO35 No 3034550$549 *nubu B m 0 oh4a No304RX09it$1095 No305552944$1195 90306534550tt3n5 1/2A MUFFLER Fits COX 049 engines No 3000049$549 No 3005051$549 Sympo 78 can whip out article covering some aspect Free Flight within next month two please send abstract proposed paper Bob Dodds Box 436 Rancho Stanta Fe CA 92067 Bob Meuser 4200 Gregory St Oak land CA 94619 Bumbled Bee/Pallet continued page 58 ber years great success also pre-shrink condenser paper damp ening allowing air-dry before applying structure reduces later warping surfaces due vary ing humidity Power requirements will course vary site site depending upon ceiling height However will likely working 035 065 rubber loop lengths between 10 14 depending upon weight particular model again characteristics site Adjustments desired flight circle fly conventionally left 35- 50-ft circles partially built-in vir tue fin formed condenser paper covering between two sup port posts forward canard surface being off-set left turn because socket rear post glued right side motorstick front socket center-line Additional turn trim can accomplished using either side-thrust differential incidence twist left right canard halves some combination two Optimum flight performance requires much trial-and-error testing varying combinations power rubber cross-sec tion length number winds wing canard trim settings Two partic ular tips dont afraid experiment CG location adding very small amount ballast clay fore aft sure wind rubber-motor left otherwise youre going very embar rassed Bumbled-Bee tries fly back towards instead forward away However get going right direction pa tience methodical approach trim adjustments think youll find little Easy-B canard fun fly fully competi tive conventional designs very least its eye-catcher conversation-starter Engine Technique/Jehlik continued page 51 Too lean enough fuel engine starts gains rpm rapidly slows down dies usually 3-5 seconds prepared adjust needle valve soon after engine starts Ive provided plenty props chances chew fin gers finally learned its best think about what may have before start ing engine Safety precautions aware fuels flammable smoke around fuels careful cause sparks battery leads stand beside en gine running Prop blades thrown off high velocity like arrows wear glasses preferably safety lenses avoid splashed fuel eyes protect moving objects use ear protection model engines definitely loud enough cause permanent partial hearing losses enough exposure Think ahead plan what will develop ritual about use wood fiberglass props tests f Now new engine running smooth rich real business bench running begins What should what should know 1 First running feel engine carefully Touch crankshaft housing should feel cold times warm hot stop engine shaft will too tight housing bearings improp erly mounted etc means take en gine apart examine surfaces shaft housing bore signs rubbing galling back duPont white rubbing compound #400 wet dry pa per remove signs damage 2 Feel bottom crankcase front back Heat front means problem rear ball bearings rear rotary valve induction engine has Crankshafts pressed too tight bearings loaded bearing inner race pulled off-center will cause heat lose power fail premature ly sure shaft slides bearing easy finger push fit Heat rotary valve means valve too close backplate warped pushed crankshaft drive pin backplate process elimination can identify problem correct 3 Feel upper part crankcase hot spots case should remain cool bypass transfers located feel evenly hot around fins con trast head should feel really hot want pull hand away involun tarily 70% heat absorbed engine itself typically expressed through head upper part case apparently hot head stop en gine disassemble hold sleeve wiped dry up light carefully look bright shine gall marks means too tight portion sleeve 4 Condition piston/sleeve Lapped Steel sleeve shiny full distance above exhaust port piston/sleeve fit too tight two remedies run b lap recom mend running tight piston because places too much strain reciprocating parts takes too long arrive cor rect fit unless use Lustrox obtained Duke Fox used directed prefer lap again duPont white compound piston begins show small verti cal scratch marks look through exhaust port run until lapped out have found little marks really cut power life engine allow develop have lapped new engine seven times order February 1978 97 jtu~I MANY OTHER ACCESSORIES SEE YOUR DEALER SEND FOR CATALOG CAR BUFFS SEND FOR OUR THUNDER ROAD CATALOG
Edition: Model Aviation - 1978/02
Page Numbers: 52, 53, 54, 96, 97
Duralion f0 Bob Meuser THE PENNY-BIPES Such isnt oftenand perhaps fact first 7 44 /7 / 6 / / 4L 4 8 4L 4 li-I 4 -ff theoretical treatment some aspect free-flight technology leads di 51 ~1 / / $ 4 4 43 degned by1-buAkLeag AMA t ajid Cat IIT 4Ojen reards bil %/ohn ksot 3 rectly success competition thats way current crop biplane Pennyplanes analysis Doug McLean con sidered biplane tandem configura tions comparison conventional layouts various indoor competition classes Tandems came out slight edge hardly enough bother biplanes came out 30% edge curious result Dougs analysis ever flight-duration potential depends very little upon wing chord over range chords considered results presented paper 1976 NFFS Symposium Report Biplane Pennyplanes have tried before no great success have right means getting wings far enough apart arent flying others downwash Although considered Dougs analy sis getting wings up high helps too drag wings puts load horizontal tail Presumably would apply monoplanes well However Clarence Mather has achieved great success wing mounted close fuselage may small effect subject competing factors McLean achieved high degree suc cess own biplane hands John Kukon design set both Category Category III Open rec ords Another biplane considerably differ ent McLean design detail adhering basic principles built Dennis Jaecks set Category II Open record Although Cat record has subsequently beaten monoplane 30% margin predicted McLean yet realized seems clear that potential can achieved given suffi cient time effort development Although havent addressed ques tion previously magazine has 52 Model Aviation 4 Pennyplane biplane Doug Mclean John Kukon currently holds Category Ill record / strong feeling Erv Rodemsky originated Pennyplane event both Pennyplane Novice Pennyplane should limited monoplanes An official rules change proposal effect currently before F/F Contest Board opposed proposed rules change contend Novice Pennyplane serves required role beginners event Pennyplane should free monoplanes-only restriction permit further experimentation development contention biplane re quires sorts construction han dling skills put event hands experienced indoor modelers familiar ultra-light con struction techniques Building two halfgram wings handling required indoor techniques building one-gram wing no sweat outdoor modeler puts mind event never intended indoor modelers exclusively sure experts will eventu ally dominate eventanything else would mere lottery competition experts would likely drawn outdoor free-flight community indoor group provided event limited monoplanes Besides event supposed simple models difficult see biplane can considered simple easy build equiva lent monoplane Novice Pennyplane its further restrictions construction prop diameter chord ideal ginners event Well soon know comes out event development bi plane Pennyplane should recognized outstanding achievement Anyone triplanes Puncture Wounds Getting few holes poked covering weeds sage brush gremlins armed pointy sticks inevitable part free-flight modeling ignored rather healing themselves tend grow worse usual quick-fix field repair squirt glue over wound leads creased weight wrinkles ugliness small punctures Bob Sylvester carries along supply tissue dots various colors Fold scrap tissue five times push X-Acto -inch punch through stack presto 32 dots smaller dots use pliers-type paper punch get cleaner job sand wich few sheets tissue between sheets bond paper Place dot over wound apply drop thinnernot dope back business neat permanent repair Slits too large covered single reflective mood Bob deShields seems willing original Drifter A-i towline model put up another good flight deemed worthy some very nice trim decorations 6 4 5 1 t / g 7 5 3 BIPLAt2E PEfl12jPUflE Dennis Jaecks 13 420 Open Cat Iii Airjiit zrs arc. 2 Front iieiv // f0 February 1978 53 Prop 17 dia ez- pitch %lotor 098x id 1450 turns dot can repaired using string dots slits inch length usually submit best application plain old model airplane cement par ticularly ragged wound Some near middle slit somehow tweak tissue opposite sides wound near contact using tweezers pins whatever suits apply small drop glue As glue dries pulls wound closed Apply few dabs glue after first nearly dry grad ually stitch sides together Finally apply glue over whole length wound wipe off excess teeny-finger wait until skin forms Better still have time apply small strips tissue over wound after stitched few years back witnessed what must ultimate cool-headedness After waiting quite awhile thermal flier started engine B-Gas Starduster planted VTO position just ready let go thumb went through wing covering producing 4-inch tear Without shutting down engine whipped trusty glue gun its holster shot wound full glue launched prepared emergency ceases exist Rumor Mill year ago hot rumor Cox going discontinue pro duction Tee Dee 020 would have killed Payload Cargo 020 Oldtimer events didnt happen current rumors making rounds Cox going discontinue Tee Dee 020 its low-sales-volume free-flight engines cluding Tee Dees 010 051 09 Conquest 15 According Coxs Customer Service Department entirely correct Tee Dee 010 will dropped line others Thats good news bad news hot 40 en gine few prototypes made large splash competition scene 1976 will go production course Cox could always change its corporate mind Nominations Are Now Order have back murky depths headbone candidate two mind NFFS Model Year award try harder tell Anthony Italiano about address 1655 Rever Dr Brookfield WI 53005 Models consideration Continued page 96 Virgil Coker dare different C Gas pylonless ST 35-pow ered job angled wing stab respect fuselage such manner retained pylon effect Sketch profile pylon ship draw fuselage wing stab position youll get idea high thrust line comes naturallyracey look ing wed say 3 I 4 ft1 Th Font 7/jew /7 /7 7 4 / 24 2 f 7 3 143~1 / f rAfl1EtI2 PEPt2JPLM2 L Do44cLea 54 Model Aviation 4 shell spar will butt against spar use toothpicks align hold spar same stabilizer Use glass cloth around spar added strength several layers glass cloth paint tails of airplanes because weight build up possibility warping tail surface sealed epoxy glue rubbed wood unpainted wood surfaces Fuel Tank suction fuel system very simple should provide very constant engine runs tank itself can easily made 010 tin can ordered John Newton Speed Racing Products completely assembled ready bolt airplane Takeoff Dolly Any three-wheel dolly front wheel spread close wing span should prove satisfactory lift-out type two guide pins extending two three inches above wingone mid-wing other close fuse lage Some weight might needed close outboard wheel just depends dolly design Engines Fuel Props use essentially stock Rossi Rear Rotor 15s Except bar stock head engine stock use bar-stock head save price Rossi inserts Rossi insert faster can keep element whole run stock Rossi stock 6-7 Rev-Up prop 65% nitro can very consistently put 162-mph bracket nitro Rossi pipe short will go 170 mph range achievable consistently standard fuel mix used usually 65-75% nitro 20% oils rest alco hol have always used least 5%-10% castor oil fuel other oil content being synthetic oil Rev-Up 6-7 prop seems about right 65-75% nitro fuel weather conditions dont stop Experiment Flying The airplane very smooth flying should present no real problems takeoff run hold some down elevator until flying speed approached ease neutral airplane should lift off easily Dont let airplane climb too high Keep about 5 feet have questions problems feel free contact us John Newton 2154 Los Padres Rowland Heights CA 91748 Jim Wade 1853 Yettford Rd Vista CA 92083 Stripper/Lidberg continued page 56 As example handy strip per can recently built unlimited rubber model long geodetically braced fuselage Cross braces 1/16 X 3/16 local hobby shop out size bought sheet 1/16 X 2 Using stripper made up 3/16 width 1/16 depth able cut 10 pieces 3/l6 wide piece about /8 wide left over strip square edges uniform width con struction sanding finished fuse lage simplified Looking again yield piece sheet balsa shows considerable savings can made 2 sheet cost 5l yielded 10 strips would have cost ll $110 Thats bad just few minutes work addition able finish model making extra trip search strip wood An Easy Balsa Stripper can made just size 15 20 minutes can make half dozen commonly used sizes Mark width stripper ready reference prevent throwing strippers out scrap color markers colored paint strip pers can used two ways Either way works better sheet balsa has good straight edge sure check first knife/straightedge routine maybe just sanding block can used produce straigbt-edged sheet method prefer cutting strips shown photos sheet held down left hand stripper used right hand Keep slight amount pressure toward sheet keep strips consistent width may prefer holding stripper left hand blade pointing up pushing sheet through right hand Rubbing surfaces stripper slide sheet balsa lightly small dry bar soap will speed up process small sharpening stone can used touch up blade new stripper can quickly made blade chipped too dull dont need strip balsa right now remember Easy Balsa Stripper next time need some Friday Saturday night after hobby shop closes hope youll find handy M uffler/Weber con tinued page 41 through muffler has pressure tap main body graph can seen expansion chamber supplies pressure flow-through other comparison between 10-6 9-6 Semco shows pressure given rpm 10-6 full throt tIe pressure slightly higher 9-6 testing muffler pressure manometer fuel level should higher open side U indicates muffler pressure exceeding atmospheric pressure fuel level higher muffler side U muffler has suc tion instead positive pressure solve problem try different location pressure tap get different muffler just forget about using muffler pressure muffler behaves well will show positive pressure rpm increasing higher rpm found examples graph same simple manometer setup can also used check other pressures such crankcase pressure fuel pump pres sure FF Duration/Meuser continued page 54 awards must somehow represent signifi cant contribution sport perhaps evidenced outstanding contest record under exceptional circumstan ces awards have presented models intended competition awards have made things other specific models name few Pennyplane event Rossi 15 Normale engine Peanut-Scale concept Seelig timer Old-Timer movement Both domestic foreign candidates eligible Supply much information can Xeroxes articles lists contest wins National records whatever cant supply send name designer whatever do soon Time awastin New Digest Editor Free Flight NFFS Digest known affectionately simply Digest has new editor Several fact After being editor seven months just really getting swing Keith Varnau found necessary give up job Bob Stalick Tom Hutchin son put together interim issue Lee Vicki Hines put out another Now its hands John Oldenkamp lives 654 India St San Diego CA 92101 Send him good stuff photos sketches stories articles contest results reports whatever Im sure hed appreciate receiving club newsletters too 96 Model Aviation FINE QUALITY KITS AND ACCESSORIES Qj2Ij SCALE PLASTIC KITS FLYING MODEL ACCESSORIES SCALE PILOTS INE GUNS WHEELS & WHEEL PANTS ENGINE KITS & CYLINDERS SEND SOt FOR COMPLETE CATALOG Dept MA ,18 1 PAWNEE STREET 4iLIJAMSSAN MARCOS CALIPORNIA 9 NEWf MUFF-L-IT SERIES Available B C engines E REGULAR IT REAR EX Six eight Ob reduction noise engines Proportional volumne expan sion chamber Large exhaust nozzle low back pressure Little no loss power No 33109IN$749 No 3022940tO35 No 3034550$549 *nubu B m 0 oh4a No304RX09it$1095 No305552944$1195 90306534550tt3n5 1/2A MUFFLER Fits COX 049 engines No 3000049$549 No 3005051$549 Sympo 78 can whip out article covering some aspect Free Flight within next month two please send abstract proposed paper Bob Dodds Box 436 Rancho Stanta Fe CA 92067 Bob Meuser 4200 Gregory St Oak land CA 94619 Bumbled Bee/Pallet continued page 58 ber years great success also pre-shrink condenser paper damp ening allowing air-dry before applying structure reduces later warping surfaces due vary ing humidity Power requirements will course vary site site depending upon ceiling height However will likely working 035 065 rubber loop lengths between 10 14 depending upon weight particular model again characteristics site Adjustments desired flight circle fly conventionally left 35- 50-ft circles partially built-in vir tue fin formed condenser paper covering between two sup port posts forward canard surface being off-set left turn because socket rear post glued right side motorstick front socket center-line Additional turn trim can accomplished using either side-thrust differential incidence twist left right canard halves some combination two Optimum flight performance requires much trial-and-error testing varying combinations power rubber cross-sec tion length number winds wing canard trim settings Two partic ular tips dont afraid experiment CG location adding very small amount ballast clay fore aft sure wind rubber-motor left otherwise youre going very embar rassed Bumbled-Bee tries fly back towards instead forward away However get going right direction pa tience methodical approach trim adjustments think youll find little Easy-B canard fun fly fully competi tive conventional designs very least its eye-catcher conversation-starter Engine Technique/Jehlik continued page 51 Too lean enough fuel engine starts gains rpm rapidly slows down dies usually 3-5 seconds prepared adjust needle valve soon after engine starts Ive provided plenty props chances chew fin gers finally learned its best think about what may have before start ing engine Safety precautions aware fuels flammable smoke around fuels careful cause sparks battery leads stand beside en gine running Prop blades thrown off high velocity like arrows wear glasses preferably safety lenses avoid splashed fuel eyes protect moving objects use ear protection model engines definitely loud enough cause permanent partial hearing losses enough exposure Think ahead plan what will develop ritual about use wood fiberglass props tests f Now new engine running smooth rich real business bench running begins What should what should know 1 First running feel engine carefully Touch crankshaft housing should feel cold times warm hot stop engine shaft will too tight housing bearings improp erly mounted etc means take en gine apart examine surfaces shaft housing bore signs rubbing galling back duPont white rubbing compound #400 wet dry pa per remove signs damage 2 Feel bottom crankcase front back Heat front means problem rear ball bearings rear rotary valve induction engine has Crankshafts pressed too tight bearings loaded bearing inner race pulled off-center will cause heat lose power fail premature ly sure shaft slides bearing easy finger push fit Heat rotary valve means valve too close backplate warped pushed crankshaft drive pin backplate process elimination can identify problem correct 3 Feel upper part crankcase hot spots case should remain cool bypass transfers located feel evenly hot around fins con trast head should feel really hot want pull hand away involun tarily 70% heat absorbed engine itself typically expressed through head upper part case apparently hot head stop en gine disassemble hold sleeve wiped dry up light carefully look bright shine gall marks means too tight portion sleeve 4 Condition piston/sleeve Lapped Steel sleeve shiny full distance above exhaust port piston/sleeve fit too tight two remedies run b lap recom mend running tight piston because places too much strain reciprocating parts takes too long arrive cor rect fit unless use Lustrox obtained Duke Fox used directed prefer lap again duPont white compound piston begins show small verti cal scratch marks look through exhaust port run until lapped out have found little marks really cut power life engine allow develop have lapped new engine seven times order February 1978 97 jtu~I MANY OTHER ACCESSORIES SEE YOUR DEALER SEND FOR CATALOG CAR BUFFS SEND FOR OUR THUNDER ROAD CATALOG
Edition: Model Aviation - 1978/02
Page Numbers: 52, 53, 54, 96, 97
Duralion f0 Bob Meuser THE PENNY-BIPES Such isnt oftenand perhaps fact first 7 44 /7 / 6 / / 4L 4 8 4L 4 li-I 4 -ff theoretical treatment some aspect free-flight technology leads di 51 ~1 / / $ 4 4 43 degned by1-buAkLeag AMA t ajid Cat IIT 4Ojen reards bil %/ohn ksot 3 rectly success competition thats way current crop biplane Pennyplanes analysis Doug McLean con sidered biplane tandem configura tions comparison conventional layouts various indoor competition classes Tandems came out slight edge hardly enough bother biplanes came out 30% edge curious result Dougs analysis ever flight-duration potential depends very little upon wing chord over range chords considered results presented paper 1976 NFFS Symposium Report Biplane Pennyplanes have tried before no great success have right means getting wings far enough apart arent flying others downwash Although considered Dougs analy sis getting wings up high helps too drag wings puts load horizontal tail Presumably would apply monoplanes well However Clarence Mather has achieved great success wing mounted close fuselage may small effect subject competing factors McLean achieved high degree suc cess own biplane hands John Kukon design set both Category Category III Open rec ords Another biplane considerably differ ent McLean design detail adhering basic principles built Dennis Jaecks set Category II Open record Although Cat record has subsequently beaten monoplane 30% margin predicted McLean yet realized seems clear that potential can achieved given suffi cient time effort development Although havent addressed ques tion previously magazine has 52 Model Aviation 4 Pennyplane biplane Doug Mclean John Kukon currently holds Category Ill record / strong feeling Erv Rodemsky originated Pennyplane event both Pennyplane Novice Pennyplane should limited monoplanes An official rules change proposal effect currently before F/F Contest Board opposed proposed rules change contend Novice Pennyplane serves required role beginners event Pennyplane should free monoplanes-only restriction permit further experimentation development contention biplane re quires sorts construction han dling skills put event hands experienced indoor modelers familiar ultra-light con struction techniques Building two halfgram wings handling required indoor techniques building one-gram wing no sweat outdoor modeler puts mind event never intended indoor modelers exclusively sure experts will eventu ally dominate eventanything else would mere lottery competition experts would likely drawn outdoor free-flight community indoor group provided event limited monoplanes Besides event supposed simple models difficult see biplane can considered simple easy build equiva lent monoplane Novice Pennyplane its further restrictions construction prop diameter chord ideal ginners event Well soon know comes out event development bi plane Pennyplane should recognized outstanding achievement Anyone triplanes Puncture Wounds Getting few holes poked covering weeds sage brush gremlins armed pointy sticks inevitable part free-flight modeling ignored rather healing themselves tend grow worse usual quick-fix field repair squirt glue over wound leads creased weight wrinkles ugliness small punctures Bob Sylvester carries along supply tissue dots various colors Fold scrap tissue five times push X-Acto -inch punch through stack presto 32 dots smaller dots use pliers-type paper punch get cleaner job sand wich few sheets tissue between sheets bond paper Place dot over wound apply drop thinnernot dope back business neat permanent repair Slits too large covered single reflective mood Bob deShields seems willing original Drifter A-i towline model put up another good flight deemed worthy some very nice trim decorations 6 4 5 1 t / g 7 5 3 BIPLAt2E PEfl12jPUflE Dennis Jaecks 13 420 Open Cat Iii Airjiit zrs arc. 2 Front iieiv // f0 February 1978 53 Prop 17 dia ez- pitch %lotor 098x id 1450 turns dot can repaired using string dots slits inch length usually submit best application plain old model airplane cement par ticularly ragged wound Some near middle slit somehow tweak tissue opposite sides wound near contact using tweezers pins whatever suits apply small drop glue As glue dries pulls wound closed Apply few dabs glue after first nearly dry grad ually stitch sides together Finally apply glue over whole length wound wipe off excess teeny-finger wait until skin forms Better still have time apply small strips tissue over wound after stitched few years back witnessed what must ultimate cool-headedness After waiting quite awhile thermal flier started engine B-Gas Starduster planted VTO position just ready let go thumb went through wing covering producing 4-inch tear Without shutting down engine whipped trusty glue gun its holster shot wound full glue launched prepared emergency ceases exist Rumor Mill year ago hot rumor Cox going discontinue pro duction Tee Dee 020 would have killed Payload Cargo 020 Oldtimer events didnt happen current rumors making rounds Cox going discontinue Tee Dee 020 its low-sales-volume free-flight engines cluding Tee Dees 010 051 09 Conquest 15 According Coxs Customer Service Department entirely correct Tee Dee 010 will dropped line others Thats good news bad news hot 40 en gine few prototypes made large splash competition scene 1976 will go production course Cox could always change its corporate mind Nominations Are Now Order have back murky depths headbone candidate two mind NFFS Model Year award try harder tell Anthony Italiano about address 1655 Rever Dr Brookfield WI 53005 Models consideration Continued page 96 Virgil Coker dare different C Gas pylonless ST 35-pow ered job angled wing stab respect fuselage such manner retained pylon effect Sketch profile pylon ship draw fuselage wing stab position youll get idea high thrust line comes naturallyracey look ing wed say 3 I 4 ft1 Th Font 7/jew /7 /7 7 4 / 24 2 f 7 3 143~1 / f rAfl1EtI2 PEPt2JPLM2 L Do44cLea 54 Model Aviation 4 shell spar will butt against spar use toothpicks align hold spar same stabilizer Use glass cloth around spar added strength several layers glass cloth paint tails of airplanes because weight build up possibility warping tail surface sealed epoxy glue rubbed wood unpainted wood surfaces Fuel Tank suction fuel system very simple should provide very constant engine runs tank itself can easily made 010 tin can ordered John Newton Speed Racing Products completely assembled ready bolt airplane Takeoff Dolly Any three-wheel dolly front wheel spread close wing span should prove satisfactory lift-out type two guide pins extending two three inches above wingone mid-wing other close fuse lage Some weight might needed close outboard wheel just depends dolly design Engines Fuel Props use essentially stock Rossi Rear Rotor 15s Except bar stock head engine stock use bar-stock head save price Rossi inserts Rossi insert faster can keep element whole run stock Rossi stock 6-7 Rev-Up prop 65% nitro can very consistently put 162-mph bracket nitro Rossi pipe short will go 170 mph range achievable consistently standard fuel mix used usually 65-75% nitro 20% oils rest alco hol have always used least 5%-10% castor oil fuel other oil content being synthetic oil Rev-Up 6-7 prop seems about right 65-75% nitro fuel weather conditions dont stop Experiment Flying The airplane very smooth flying should present no real problems takeoff run hold some down elevator until flying speed approached ease neutral airplane should lift off easily Dont let airplane climb too high Keep about 5 feet have questions problems feel free contact us John Newton 2154 Los Padres Rowland Heights CA 91748 Jim Wade 1853 Yettford Rd Vista CA 92083 Stripper/Lidberg continued page 56 As example handy strip per can recently built unlimited rubber model long geodetically braced fuselage Cross braces 1/16 X 3/16 local hobby shop out size bought sheet 1/16 X 2 Using stripper made up 3/16 width 1/16 depth able cut 10 pieces 3/l6 wide piece about /8 wide left over strip square edges uniform width con struction sanding finished fuse lage simplified Looking again yield piece sheet balsa shows considerable savings can made 2 sheet cost 5l yielded 10 strips would have cost ll $110 Thats bad just few minutes work addition able finish model making extra trip search strip wood An Easy Balsa Stripper can made just size 15 20 minutes can make half dozen commonly used sizes Mark width stripper ready reference prevent throwing strippers out scrap color markers colored paint strip pers can used two ways Either way works better sheet balsa has good straight edge sure check first knife/straightedge routine maybe just sanding block can used produce straigbt-edged sheet method prefer cutting strips shown photos sheet held down left hand stripper used right hand Keep slight amount pressure toward sheet keep strips consistent width may prefer holding stripper left hand blade pointing up pushing sheet through right hand Rubbing surfaces stripper slide sheet balsa lightly small dry bar soap will speed up process small sharpening stone can used touch up blade new stripper can quickly made blade chipped too dull dont need strip balsa right now remember Easy Balsa Stripper next time need some Friday Saturday night after hobby shop closes hope youll find handy M uffler/Weber con tinued page 41 through muffler has pressure tap main body graph can seen expansion chamber supplies pressure flow-through other comparison between 10-6 9-6 Semco shows pressure given rpm 10-6 full throt tIe pressure slightly higher 9-6 testing muffler pressure manometer fuel level should higher open side U indicates muffler pressure exceeding atmospheric pressure fuel level higher muffler side U muffler has suc tion instead positive pressure solve problem try different location pressure tap get different muffler just forget about using muffler pressure muffler behaves well will show positive pressure rpm increasing higher rpm found examples graph same simple manometer setup can also used check other pressures such crankcase pressure fuel pump pres sure FF Duration/Meuser continued page 54 awards must somehow represent signifi cant contribution sport perhaps evidenced outstanding contest record under exceptional circumstan ces awards have presented models intended competition awards have made things other specific models name few Pennyplane event Rossi 15 Normale engine Peanut-Scale concept Seelig timer Old-Timer movement Both domestic foreign candidates eligible Supply much information can Xeroxes articles lists contest wins National records whatever cant supply send name designer whatever do soon Time awastin New Digest Editor Free Flight NFFS Digest known affectionately simply Digest has new editor Several fact After being editor seven months just really getting swing Keith Varnau found necessary give up job Bob Stalick Tom Hutchin son put together interim issue Lee Vicki Hines put out another Now its hands John Oldenkamp lives 654 India St San Diego CA 92101 Send him good stuff photos sketches stories articles contest results reports whatever Im sure hed appreciate receiving club newsletters too 96 Model Aviation FINE QUALITY KITS AND ACCESSORIES Qj2Ij SCALE PLASTIC KITS FLYING MODEL ACCESSORIES SCALE PILOTS INE GUNS WHEELS & WHEEL PANTS ENGINE KITS & CYLINDERS SEND SOt FOR COMPLETE CATALOG Dept MA ,18 1 PAWNEE STREET 4iLIJAMSSAN MARCOS CALIPORNIA 9 NEWf MUFF-L-IT SERIES Available B C engines E REGULAR IT REAR EX Six eight Ob reduction noise engines Proportional volumne expan sion chamber Large exhaust nozzle low back pressure Little no loss power No 33109IN$749 No 3022940tO35 No 3034550$549 *nubu B m 0 oh4a No304RX09it$1095 No305552944$1195 90306534550tt3n5 1/2A MUFFLER Fits COX 049 engines No 3000049$549 No 3005051$549 Sympo 78 can whip out article covering some aspect Free Flight within next month two please send abstract proposed paper Bob Dodds Box 436 Rancho Stanta Fe CA 92067 Bob Meuser 4200 Gregory St Oak land CA 94619 Bumbled Bee/Pallet continued page 58 ber years great success also pre-shrink condenser paper damp ening allowing air-dry before applying structure reduces later warping surfaces due vary ing humidity Power requirements will course vary site site depending upon ceiling height However will likely working 035 065 rubber loop lengths between 10 14 depending upon weight particular model again characteristics site Adjustments desired flight circle fly conventionally left 35- 50-ft circles partially built-in vir tue fin formed condenser paper covering between two sup port posts forward canard surface being off-set left turn because socket rear post glued right side motorstick front socket center-line Additional turn trim can accomplished using either side-thrust differential incidence twist left right canard halves some combination two Optimum flight performance requires much trial-and-error testing varying combinations power rubber cross-sec tion length number winds wing canard trim settings Two partic ular tips dont afraid experiment CG location adding very small amount ballast clay fore aft sure wind rubber-motor left otherwise youre going very embar rassed Bumbled-Bee tries fly back towards instead forward away However get going right direction pa tience methodical approach trim adjustments think youll find little Easy-B canard fun fly fully competi tive conventional designs very least its eye-catcher conversation-starter Engine Technique/Jehlik continued page 51 Too lean enough fuel engine starts gains rpm rapidly slows down dies usually 3-5 seconds prepared adjust needle valve soon after engine starts Ive provided plenty props chances chew fin gers finally learned its best think about what may have before start ing engine Safety precautions aware fuels flammable smoke around fuels careful cause sparks battery leads stand beside en gine running Prop blades thrown off high velocity like arrows wear glasses preferably safety lenses avoid splashed fuel eyes protect moving objects use ear protection model engines definitely loud enough cause permanent partial hearing losses enough exposure Think ahead plan what will develop ritual about use wood fiberglass props tests f Now new engine running smooth rich real business bench running begins What should what should know 1 First running feel engine carefully Touch crankshaft housing should feel cold times warm hot stop engine shaft will too tight housing bearings improp erly mounted etc means take en gine apart examine surfaces shaft housing bore signs rubbing galling back duPont white rubbing compound #400 wet dry pa per remove signs damage 2 Feel bottom crankcase front back Heat front means problem rear ball bearings rear rotary valve induction engine has Crankshafts pressed too tight bearings loaded bearing inner race pulled off-center will cause heat lose power fail premature ly sure shaft slides bearing easy finger push fit Heat rotary valve means valve too close backplate warped pushed crankshaft drive pin backplate process elimination can identify problem correct 3 Feel upper part crankcase hot spots case should remain cool bypass transfers located feel evenly hot around fins con trast head should feel really hot want pull hand away involun tarily 70% heat absorbed engine itself typically expressed through head upper part case apparently hot head stop en gine disassemble hold sleeve wiped dry up light carefully look bright shine gall marks means too tight portion sleeve 4 Condition piston/sleeve Lapped Steel sleeve shiny full distance above exhaust port piston/sleeve fit too tight two remedies run b lap recom mend running tight piston because places too much strain reciprocating parts takes too long arrive cor rect fit unless use Lustrox obtained Duke Fox used directed prefer lap again duPont white compound piston begins show small verti cal scratch marks look through exhaust port run until lapped out have found little marks really cut power life engine allow develop have lapped new engine seven times order February 1978 97 jtu~I MANY OTHER ACCESSORIES SEE YOUR DEALER SEND FOR CATALOG CAR BUFFS SEND FOR OUR THUNDER ROAD CATALOG
Edition: Model Aviation - 1978/02
Page Numbers: 52, 53, 54, 96, 97
Duralion f0 Bob Meuser THE PENNY-BIPES Such isnt oftenand perhaps fact first 7 44 /7 / 6 / / 4L 4 8 4L 4 li-I 4 -ff theoretical treatment some aspect free-flight technology leads di 51 ~1 / / $ 4 4 43 degned by1-buAkLeag AMA t ajid Cat IIT 4Ojen reards bil %/ohn ksot 3 rectly success competition thats way current crop biplane Pennyplanes analysis Doug McLean con sidered biplane tandem configura tions comparison conventional layouts various indoor competition classes Tandems came out slight edge hardly enough bother biplanes came out 30% edge curious result Dougs analysis ever flight-duration potential depends very little upon wing chord over range chords considered results presented paper 1976 NFFS Symposium Report Biplane Pennyplanes have tried before no great success have right means getting wings far enough apart arent flying others downwash Although considered Dougs analy sis getting wings up high helps too drag wings puts load horizontal tail Presumably would apply monoplanes well However Clarence Mather has achieved great success wing mounted close fuselage may small effect subject competing factors McLean achieved high degree suc cess own biplane hands John Kukon design set both Category Category III Open rec ords Another biplane considerably differ ent McLean design detail adhering basic principles built Dennis Jaecks set Category II Open record Although Cat record has subsequently beaten monoplane 30% margin predicted McLean yet realized seems clear that potential can achieved given suffi cient time effort development Although havent addressed ques tion previously magazine has 52 Model Aviation 4 Pennyplane biplane Doug Mclean John Kukon currently holds Category Ill record / strong feeling Erv Rodemsky originated Pennyplane event both Pennyplane Novice Pennyplane should limited monoplanes An official rules change proposal effect currently before F/F Contest Board opposed proposed rules change contend Novice Pennyplane serves required role beginners event Pennyplane should free monoplanes-only restriction permit further experimentation development contention biplane re quires sorts construction han dling skills put event hands experienced indoor modelers familiar ultra-light con struction techniques Building two halfgram wings handling required indoor techniques building one-gram wing no sweat outdoor modeler puts mind event never intended indoor modelers exclusively sure experts will eventu ally dominate eventanything else would mere lottery competition experts would likely drawn outdoor free-flight community indoor group provided event limited monoplanes Besides event supposed simple models difficult see biplane can considered simple easy build equiva lent monoplane Novice Pennyplane its further restrictions construction prop diameter chord ideal ginners event Well soon know comes out event development bi plane Pennyplane should recognized outstanding achievement Anyone triplanes Puncture Wounds Getting few holes poked covering weeds sage brush gremlins armed pointy sticks inevitable part free-flight modeling ignored rather healing themselves tend grow worse usual quick-fix field repair squirt glue over wound leads creased weight wrinkles ugliness small punctures Bob Sylvester carries along supply tissue dots various colors Fold scrap tissue five times push X-Acto -inch punch through stack presto 32 dots smaller dots use pliers-type paper punch get cleaner job sand wich few sheets tissue between sheets bond paper Place dot over wound apply drop thinnernot dope back business neat permanent repair Slits too large covered single reflective mood Bob deShields seems willing original Drifter A-i towline model put up another good flight deemed worthy some very nice trim decorations 6 4 5 1 t / g 7 5 3 BIPLAt2E PEfl12jPUflE Dennis Jaecks 13 420 Open Cat Iii Airjiit zrs arc. 2 Front iieiv // f0 February 1978 53 Prop 17 dia ez- pitch %lotor 098x id 1450 turns dot can repaired using string dots slits inch length usually submit best application plain old model airplane cement par ticularly ragged wound Some near middle slit somehow tweak tissue opposite sides wound near contact using tweezers pins whatever suits apply small drop glue As glue dries pulls wound closed Apply few dabs glue after first nearly dry grad ually stitch sides together Finally apply glue over whole length wound wipe off excess teeny-finger wait until skin forms Better still have time apply small strips tissue over wound after stitched few years back witnessed what must ultimate cool-headedness After waiting quite awhile thermal flier started engine B-Gas Starduster planted VTO position just ready let go thumb went through wing covering producing 4-inch tear Without shutting down engine whipped trusty glue gun its holster shot wound full glue launched prepared emergency ceases exist Rumor Mill year ago hot rumor Cox going discontinue pro duction Tee Dee 020 would have killed Payload Cargo 020 Oldtimer events didnt happen current rumors making rounds Cox going discontinue Tee Dee 020 its low-sales-volume free-flight engines cluding Tee Dees 010 051 09 Conquest 15 According Coxs Customer Service Department entirely correct Tee Dee 010 will dropped line others Thats good news bad news hot 40 en gine few prototypes made large splash competition scene 1976 will go production course Cox could always change its corporate mind Nominations Are Now Order have back murky depths headbone candidate two mind NFFS Model Year award try harder tell Anthony Italiano about address 1655 Rever Dr Brookfield WI 53005 Models consideration Continued page 96 Virgil Coker dare different C Gas pylonless ST 35-pow ered job angled wing stab respect fuselage such manner retained pylon effect Sketch profile pylon ship draw fuselage wing stab position youll get idea high thrust line comes naturallyracey look ing wed say 3 I 4 ft1 Th Font 7/jew /7 /7 7 4 / 24 2 f 7 3 143~1 / f rAfl1EtI2 PEPt2JPLM2 L Do44cLea 54 Model Aviation 4 shell spar will butt against spar use toothpicks align hold spar same stabilizer Use glass cloth around spar added strength several layers glass cloth paint tails of airplanes because weight build up possibility warping tail surface sealed epoxy glue rubbed wood unpainted wood surfaces Fuel Tank suction fuel system very simple should provide very constant engine runs tank itself can easily made 010 tin can ordered John Newton Speed Racing Products completely assembled ready bolt airplane Takeoff Dolly Any three-wheel dolly front wheel spread close wing span should prove satisfactory lift-out type two guide pins extending two three inches above wingone mid-wing other close fuse lage Some weight might needed close outboard wheel just depends dolly design Engines Fuel Props use essentially stock Rossi Rear Rotor 15s Except bar stock head engine stock use bar-stock head save price Rossi inserts Rossi insert faster can keep element whole run stock Rossi stock 6-7 Rev-Up prop 65% nitro can very consistently put 162-mph bracket nitro Rossi pipe short will go 170 mph range achievable consistently standard fuel mix used usually 65-75% nitro 20% oils rest alco hol have always used least 5%-10% castor oil fuel other oil content being synthetic oil Rev-Up 6-7 prop seems about right 65-75% nitro fuel weather conditions dont stop Experiment Flying The airplane very smooth flying should present no real problems takeoff run hold some down elevator until flying speed approached ease neutral airplane should lift off easily Dont let airplane climb too high Keep about 5 feet have questions problems feel free contact us John Newton 2154 Los Padres Rowland Heights CA 91748 Jim Wade 1853 Yettford Rd Vista CA 92083 Stripper/Lidberg continued page 56 As example handy strip per can recently built unlimited rubber model long geodetically braced fuselage Cross braces 1/16 X 3/16 local hobby shop out size bought sheet 1/16 X 2 Using stripper made up 3/16 width 1/16 depth able cut 10 pieces 3/l6 wide piece about /8 wide left over strip square edges uniform width con struction sanding finished fuse lage simplified Looking again yield piece sheet balsa shows considerable savings can made 2 sheet cost 5l yielded 10 strips would have cost ll $110 Thats bad just few minutes work addition able finish model making extra trip search strip wood An Easy Balsa Stripper can made just size 15 20 minutes can make half dozen commonly used sizes Mark width stripper ready reference prevent throwing strippers out scrap color markers colored paint strip pers can used two ways Either way works better sheet balsa has good straight edge sure check first knife/straightedge routine maybe just sanding block can used produce straigbt-edged sheet method prefer cutting strips shown photos sheet held down left hand stripper used right hand Keep slight amount pressure toward sheet keep strips consistent width may prefer holding stripper left hand blade pointing up pushing sheet through right hand Rubbing surfaces stripper slide sheet balsa lightly small dry bar soap will speed up process small sharpening stone can used touch up blade new stripper can quickly made blade chipped too dull dont need strip balsa right now remember Easy Balsa Stripper next time need some Friday Saturday night after hobby shop closes hope youll find handy M uffler/Weber con tinued page 41 through muffler has pressure tap main body graph can seen expansion chamber supplies pressure flow-through other comparison between 10-6 9-6 Semco shows pressure given rpm 10-6 full throt tIe pressure slightly higher 9-6 testing muffler pressure manometer fuel level should higher open side U indicates muffler pressure exceeding atmospheric pressure fuel level higher muffler side U muffler has suc tion instead positive pressure solve problem try different location pressure tap get different muffler just forget about using muffler pressure muffler behaves well will show positive pressure rpm increasing higher rpm found examples graph same simple manometer setup can also used check other pressures such crankcase pressure fuel pump pres sure FF Duration/Meuser continued page 54 awards must somehow represent signifi cant contribution sport perhaps evidenced outstanding contest record under exceptional circumstan ces awards have presented models intended competition awards have made things other specific models name few Pennyplane event Rossi 15 Normale engine Peanut-Scale concept Seelig timer Old-Timer movement Both domestic foreign candidates eligible Supply much information can Xeroxes articles lists contest wins National records whatever cant supply send name designer whatever do soon Time awastin New Digest Editor Free Flight NFFS Digest known affectionately simply Digest has new editor Several fact After being editor seven months just really getting swing Keith Varnau found necessary give up job Bob Stalick Tom Hutchin son put together interim issue Lee Vicki Hines put out another Now its hands John Oldenkamp lives 654 India St San Diego CA 92101 Send him good stuff photos sketches stories articles contest results reports whatever Im sure hed appreciate receiving club newsletters too 96 Model Aviation FINE QUALITY KITS AND ACCESSORIES Qj2Ij SCALE PLASTIC KITS FLYING MODEL ACCESSORIES SCALE PILOTS INE GUNS WHEELS & WHEEL PANTS ENGINE KITS & CYLINDERS SEND SOt FOR COMPLETE CATALOG Dept MA ,18 1 PAWNEE STREET 4iLIJAMSSAN MARCOS CALIPORNIA 9 NEWf MUFF-L-IT SERIES Available B C engines E REGULAR IT REAR EX Six eight Ob reduction noise engines Proportional volumne expan sion chamber Large exhaust nozzle low back pressure Little no loss power No 33109IN$749 No 3022940tO35 No 3034550$549 *nubu B m 0 oh4a No304RX09it$1095 No305552944$1195 90306534550tt3n5 1/2A MUFFLER Fits COX 049 engines No 3000049$549 No 3005051$549 Sympo 78 can whip out article covering some aspect Free Flight within next month two please send abstract proposed paper Bob Dodds Box 436 Rancho Stanta Fe CA 92067 Bob Meuser 4200 Gregory St Oak land CA 94619 Bumbled Bee/Pallet continued page 58 ber years great success also pre-shrink condenser paper damp ening allowing air-dry before applying structure reduces later warping surfaces due vary ing humidity Power requirements will course vary site site depending upon ceiling height However will likely working 035 065 rubber loop lengths between 10 14 depending upon weight particular model again characteristics site Adjustments desired flight circle fly conventionally left 35- 50-ft circles partially built-in vir tue fin formed condenser paper covering between two sup port posts forward canard surface being off-set left turn because socket rear post glued right side motorstick front socket center-line Additional turn trim can accomplished using either side-thrust differential incidence twist left right canard halves some combination two Optimum flight performance requires much trial-and-error testing varying combinations power rubber cross-sec tion length number winds wing canard trim settings Two partic ular tips dont afraid experiment CG location adding very small amount ballast clay fore aft sure wind rubber-motor left otherwise youre going very embar rassed Bumbled-Bee tries fly back towards instead forward away However get going right direction pa tience methodical approach trim adjustments think youll find little Easy-B canard fun fly fully competi tive conventional designs very least its eye-catcher conversation-starter Engine Technique/Jehlik continued page 51 Too lean enough fuel engine starts gains rpm rapidly slows down dies usually 3-5 seconds prepared adjust needle valve soon after engine starts Ive provided plenty props chances chew fin gers finally learned its best think about what may have before start ing engine Safety precautions aware fuels flammable smoke around fuels careful cause sparks battery leads stand beside en gine running Prop blades thrown off high velocity like arrows wear glasses preferably safety lenses avoid splashed fuel eyes protect moving objects use ear protection model engines definitely loud enough cause permanent partial hearing losses enough exposure Think ahead plan what will develop ritual about use wood fiberglass props tests f Now new engine running smooth rich real business bench running begins What should what should know 1 First running feel engine carefully Touch crankshaft housing should feel cold times warm hot stop engine shaft will too tight housing bearings improp erly mounted etc means take en gine apart examine surfaces shaft housing bore signs rubbing galling back duPont white rubbing compound #400 wet dry pa per remove signs damage 2 Feel bottom crankcase front back Heat front means problem rear ball bearings rear rotary valve induction engine has Crankshafts pressed too tight bearings loaded bearing inner race pulled off-center will cause heat lose power fail premature ly sure shaft slides bearing easy finger push fit Heat rotary valve means valve too close backplate warped pushed crankshaft drive pin backplate process elimination can identify problem correct 3 Feel upper part crankcase hot spots case should remain cool bypass transfers located feel evenly hot around fins con trast head should feel really hot want pull hand away involun tarily 70% heat absorbed engine itself typically expressed through head upper part case apparently hot head stop en gine disassemble hold sleeve wiped dry up light carefully look bright shine gall marks means too tight portion sleeve 4 Condition piston/sleeve Lapped Steel sleeve shiny full distance above exhaust port piston/sleeve fit too tight two remedies run b lap recom mend running tight piston because places too much strain reciprocating parts takes too long arrive cor rect fit unless use Lustrox obtained Duke Fox used directed prefer lap again duPont white compound piston begins show small verti cal scratch marks look through exhaust port run until lapped out have found little marks really cut power life engine allow develop have lapped new engine seven times order February 1978 97 jtu~I MANY OTHER ACCESSORIES SEE YOUR DEALER SEND FOR CATALOG CAR BUFFS SEND FOR OUR THUNDER ROAD CATALOG
Edition: Model Aviation - 1978/02
Page Numbers: 52, 53, 54, 96, 97
Duralion f0 Bob Meuser THE PENNY-BIPES Such isnt oftenand perhaps fact first 7 44 /7 / 6 / / 4L 4 8 4L 4 li-I 4 -ff theoretical treatment some aspect free-flight technology leads di 51 ~1 / / $ 4 4 43 degned by1-buAkLeag AMA t ajid Cat IIT 4Ojen reards bil %/ohn ksot 3 rectly success competition thats way current crop biplane Pennyplanes analysis Doug McLean con sidered biplane tandem configura tions comparison conventional layouts various indoor competition classes Tandems came out slight edge hardly enough bother biplanes came out 30% edge curious result Dougs analysis ever flight-duration potential depends very little upon wing chord over range chords considered results presented paper 1976 NFFS Symposium Report Biplane Pennyplanes have tried before no great success have right means getting wings far enough apart arent flying others downwash Although considered Dougs analy sis getting wings up high helps too drag wings puts load horizontal tail Presumably would apply monoplanes well However Clarence Mather has achieved great success wing mounted close fuselage may small effect subject competing factors McLean achieved high degree suc cess own biplane hands John Kukon design set both Category Category III Open rec ords Another biplane considerably differ ent McLean design detail adhering basic principles built Dennis Jaecks set Category II Open record Although Cat record has subsequently beaten monoplane 30% margin predicted McLean yet realized seems clear that potential can achieved given suffi cient time effort development Although havent addressed ques tion previously magazine has 52 Model Aviation 4 Pennyplane biplane Doug Mclean John Kukon currently holds Category Ill record / strong feeling Erv Rodemsky originated Pennyplane event both Pennyplane Novice Pennyplane should limited monoplanes An official rules change proposal effect currently before F/F Contest Board opposed proposed rules change contend Novice Pennyplane serves required role beginners event Pennyplane should free monoplanes-only restriction permit further experimentation development contention biplane re quires sorts construction han dling skills put event hands experienced indoor modelers familiar ultra-light con struction techniques Building two halfgram wings handling required indoor techniques building one-gram wing no sweat outdoor modeler puts mind event never intended indoor modelers exclusively sure experts will eventu ally dominate eventanything else would mere lottery competition experts would likely drawn outdoor free-flight community indoor group provided event limited monoplanes Besides event supposed simple models difficult see biplane can considered simple easy build equiva lent monoplane Novice Pennyplane its further restrictions construction prop diameter chord ideal ginners event Well soon know comes out event development bi plane Pennyplane should recognized outstanding achievement Anyone triplanes Puncture Wounds Getting few holes poked covering weeds sage brush gremlins armed pointy sticks inevitable part free-flight modeling ignored rather healing themselves tend grow worse usual quick-fix field repair squirt glue over wound leads creased weight wrinkles ugliness small punctures Bob Sylvester carries along supply tissue dots various colors Fold scrap tissue five times push X-Acto -inch punch through stack presto 32 dots smaller dots use pliers-type paper punch get cleaner job sand wich few sheets tissue between sheets bond paper Place dot over wound apply drop thinnernot dope back business neat permanent repair Slits too large covered single reflective mood Bob deShields seems willing original Drifter A-i towline model put up another good flight deemed worthy some very nice trim decorations 6 4 5 1 t / g 7 5 3 BIPLAt2E PEfl12jPUflE Dennis Jaecks 13 420 Open Cat Iii Airjiit zrs arc. 2 Front iieiv // f0 February 1978 53 Prop 17 dia ez- pitch %lotor 098x id 1450 turns dot can repaired using string dots slits inch length usually submit best application plain old model airplane cement par ticularly ragged wound Some near middle slit somehow tweak tissue opposite sides wound near contact using tweezers pins whatever suits apply small drop glue As glue dries pulls wound closed Apply few dabs glue after first nearly dry grad ually stitch sides together Finally apply glue over whole length wound wipe off excess teeny-finger wait until skin forms Better still have time apply small strips tissue over wound after stitched few years back witnessed what must ultimate cool-headedness After waiting quite awhile thermal flier started engine B-Gas Starduster planted VTO position just ready let go thumb went through wing covering producing 4-inch tear Without shutting down engine whipped trusty glue gun its holster shot wound full glue launched prepared emergency ceases exist Rumor Mill year ago hot rumor Cox going discontinue pro duction Tee Dee 020 would have killed Payload Cargo 020 Oldtimer events didnt happen current rumors making rounds Cox going discontinue Tee Dee 020 its low-sales-volume free-flight engines cluding Tee Dees 010 051 09 Conquest 15 According Coxs Customer Service Department entirely correct Tee Dee 010 will dropped line others Thats good news bad news hot 40 en gine few prototypes made large splash competition scene 1976 will go production course Cox could always change its corporate mind Nominations Are Now Order have back murky depths headbone candidate two mind NFFS Model Year award try harder tell Anthony Italiano about address 1655 Rever Dr Brookfield WI 53005 Models consideration Continued page 96 Virgil Coker dare different C Gas pylonless ST 35-pow ered job angled wing stab respect fuselage such manner retained pylon effect Sketch profile pylon ship draw fuselage wing stab position youll get idea high thrust line comes naturallyracey look ing wed say 3 I 4 ft1 Th Font 7/jew /7 /7 7 4 / 24 2 f 7 3 143~1 / f rAfl1EtI2 PEPt2JPLM2 L Do44cLea 54 Model Aviation 4 shell spar will butt against spar use toothpicks align hold spar same stabilizer Use glass cloth around spar added strength several layers glass cloth paint tails of airplanes because weight build up possibility warping tail surface sealed epoxy glue rubbed wood unpainted wood surfaces Fuel Tank suction fuel system very simple should provide very constant engine runs tank itself can easily made 010 tin can ordered John Newton Speed Racing Products completely assembled ready bolt airplane Takeoff Dolly Any three-wheel dolly front wheel spread close wing span should prove satisfactory lift-out type two guide pins extending two three inches above wingone mid-wing other close fuse lage Some weight might needed close outboard wheel just depends dolly design Engines Fuel Props use essentially stock Rossi Rear Rotor 15s Except bar stock head engine stock use bar-stock head save price Rossi inserts Rossi insert faster can keep element whole run stock Rossi stock 6-7 Rev-Up prop 65% nitro can very consistently put 162-mph bracket nitro Rossi pipe short will go 170 mph range achievable consistently standard fuel mix used usually 65-75% nitro 20% oils rest alco hol have always used least 5%-10% castor oil fuel other oil content being synthetic oil Rev-Up 6-7 prop seems about right 65-75% nitro fuel weather conditions dont stop Experiment Flying The airplane very smooth flying should present no real problems takeoff run hold some down elevator until flying speed approached ease neutral airplane should lift off easily Dont let airplane climb too high Keep about 5 feet have questions problems feel free contact us John Newton 2154 Los Padres Rowland Heights CA 91748 Jim Wade 1853 Yettford Rd Vista CA 92083 Stripper/Lidberg continued page 56 As example handy strip per can recently built unlimited rubber model long geodetically braced fuselage Cross braces 1/16 X 3/16 local hobby shop out size bought sheet 1/16 X 2 Using stripper made up 3/16 width 1/16 depth able cut 10 pieces 3/l6 wide piece about /8 wide left over strip square edges uniform width con struction sanding finished fuse lage simplified Looking again yield piece sheet balsa shows considerable savings can made 2 sheet cost 5l yielded 10 strips would have cost ll $110 Thats bad just few minutes work addition able finish model making extra trip search strip wood An Easy Balsa Stripper can made just size 15 20 minutes can make half dozen commonly used sizes Mark width stripper ready reference prevent throwing strippers out scrap color markers colored paint strip pers can used two ways Either way works better sheet balsa has good straight edge sure check first knife/straightedge routine maybe just sanding block can used produce straigbt-edged sheet method prefer cutting strips shown photos sheet held down left hand stripper used right hand Keep slight amount pressure toward sheet keep strips consistent width may prefer holding stripper left hand blade pointing up pushing sheet through right hand Rubbing surfaces stripper slide sheet balsa lightly small dry bar soap will speed up process small sharpening stone can used touch up blade new stripper can quickly made blade chipped too dull dont need strip balsa right now remember Easy Balsa Stripper next time need some Friday Saturday night after hobby shop closes hope youll find handy M uffler/Weber con tinued page 41 through muffler has pressure tap main body graph can seen expansion chamber supplies pressure flow-through other comparison between 10-6 9-6 Semco shows pressure given rpm 10-6 full throt tIe pressure slightly higher 9-6 testing muffler pressure manometer fuel level should higher open side U indicates muffler pressure exceeding atmospheric pressure fuel level higher muffler side U muffler has suc tion instead positive pressure solve problem try different location pressure tap get different muffler just forget about using muffler pressure muffler behaves well will show positive pressure rpm increasing higher rpm found examples graph same simple manometer setup can also used check other pressures such crankcase pressure fuel pump pres sure FF Duration/Meuser continued page 54 awards must somehow represent signifi cant contribution sport perhaps evidenced outstanding contest record under exceptional circumstan ces awards have presented models intended competition awards have made things other specific models name few Pennyplane event Rossi 15 Normale engine Peanut-Scale concept Seelig timer Old-Timer movement Both domestic foreign candidates eligible Supply much information can Xeroxes articles lists contest wins National records whatever cant supply send name designer whatever do soon Time awastin New Digest Editor Free Flight NFFS Digest known affectionately simply Digest has new editor Several fact After being editor seven months just really getting swing Keith Varnau found necessary give up job Bob Stalick Tom Hutchin son put together interim issue Lee Vicki Hines put out another Now its hands John Oldenkamp lives 654 India St San Diego CA 92101 Send him good stuff photos sketches stories articles contest results reports whatever Im sure hed appreciate receiving club newsletters too 96 Model Aviation FINE QUALITY KITS AND ACCESSORIES Qj2Ij SCALE PLASTIC KITS FLYING MODEL ACCESSORIES SCALE PILOTS INE GUNS WHEELS & WHEEL PANTS ENGINE KITS & CYLINDERS SEND SOt FOR COMPLETE CATALOG Dept MA ,18 1 PAWNEE STREET 4iLIJAMSSAN MARCOS CALIPORNIA 9 NEWf MUFF-L-IT SERIES Available B C engines E REGULAR IT REAR EX Six eight Ob reduction noise engines Proportional volumne expan sion chamber Large exhaust nozzle low back pressure Little no loss power No 33109IN$749 No 3022940tO35 No 3034550$549 *nubu B m 0 oh4a No304RX09it$1095 No305552944$1195 90306534550tt3n5 1/2A MUFFLER Fits COX 049 engines No 3000049$549 No 3005051$549 Sympo 78 can whip out article covering some aspect Free Flight within next month two please send abstract proposed paper Bob Dodds Box 436 Rancho Stanta Fe CA 92067 Bob Meuser 4200 Gregory St Oak land CA 94619 Bumbled Bee/Pallet continued page 58 ber years great success also pre-shrink condenser paper damp ening allowing air-dry before applying structure reduces later warping surfaces due vary ing humidity Power requirements will course vary site site depending upon ceiling height However will likely working 035 065 rubber loop lengths between 10 14 depending upon weight particular model again characteristics site Adjustments desired flight circle fly conventionally left 35- 50-ft circles partially built-in vir tue fin formed condenser paper covering between two sup port posts forward canard surface being off-set left turn because socket rear post glued right side motorstick front socket center-line Additional turn trim can accomplished using either side-thrust differential incidence twist left right canard halves some combination two Optimum flight performance requires much trial-and-error testing varying combinations power rubber cross-sec tion length number winds wing canard trim settings Two partic ular tips dont afraid experiment CG location adding very small amount ballast clay fore aft sure wind rubber-motor left otherwise youre going very embar rassed Bumbled-Bee tries fly back towards instead forward away However get going right direction pa tience methodical approach trim adjustments think youll find little Easy-B canard fun fly fully competi tive conventional designs very least its eye-catcher conversation-starter Engine Technique/Jehlik continued page 51 Too lean enough fuel engine starts gains rpm rapidly slows down dies usually 3-5 seconds prepared adjust needle valve soon after engine starts Ive provided plenty props chances chew fin gers finally learned its best think about what may have before start ing engine Safety precautions aware fuels flammable smoke around fuels careful cause sparks battery leads stand beside en gine running Prop blades thrown off high velocity like arrows wear glasses preferably safety lenses avoid splashed fuel eyes protect moving objects use ear protection model engines definitely loud enough cause permanent partial hearing losses enough exposure Think ahead plan what will develop ritual about use wood fiberglass props tests f Now new engine running smooth rich real business bench running begins What should what should know 1 First running feel engine carefully Touch crankshaft housing should feel cold times warm hot stop engine shaft will too tight housing bearings improp erly mounted etc means take en gine apart examine surfaces shaft housing bore signs rubbing galling back duPont white rubbing compound #400 wet dry pa per remove signs damage 2 Feel bottom crankcase front back Heat front means problem rear ball bearings rear rotary valve induction engine has Crankshafts pressed too tight bearings loaded bearing inner race pulled off-center will cause heat lose power fail premature ly sure shaft slides bearing easy finger push fit Heat rotary valve means valve too close backplate warped pushed crankshaft drive pin backplate process elimination can identify problem correct 3 Feel upper part crankcase hot spots case should remain cool bypass transfers located feel evenly hot around fins con trast head should feel really hot want pull hand away involun tarily 70% heat absorbed engine itself typically expressed through head upper part case apparently hot head stop en gine disassemble hold sleeve wiped dry up light carefully look bright shine gall marks means too tight portion sleeve 4 Condition piston/sleeve Lapped Steel sleeve shiny full distance above exhaust port piston/sleeve fit too tight two remedies run b lap recom mend running tight piston because places too much strain reciprocating parts takes too long arrive cor rect fit unless use Lustrox obtained Duke Fox used directed prefer lap again duPont white compound piston begins show small verti cal scratch marks look through exhaust port run until lapped out have found little marks really cut power life engine allow develop have lapped new engine seven times order February 1978 97 jtu~I MANY OTHER ACCESSORIES SEE YOUR DEALER SEND FOR CATALOG CAR BUFFS SEND FOR OUR THUNDER ROAD CATALOG