THE September October 1978 issues Model Aviation contained very inter esting two-part article Tom Hail Larry Fagan make fiberglass props found very timely article since wanting try hand some time have some very teresting experiences props other manufacture anxious try some ideas own seemed would best start glass prop raw materials rather wood problem no suitable props available play So must make own Larry Toms article provided impetus needed laying out some needed informa tion techniques Shortly after September issue came out attended 78 Nats Lake Charles spent some time talking several people have also done some glass prop work Two notable names provided formation Les Pardue Albuquer que New Mexico Walt Perkins Ocala Florida Les Flipper half Whipper Flipper team Phil Shew being strong arm handle Walt Perkins guy behind Shadow Racing best sources FAI Team Race items among some finest carbon-fiber props can find prop John Ballard used win Goodyear Nats last year Shadow prop Another source information Vic Gamer Livermore California Some experiences have some techniques have developed stolen might interest anybody might wanting try hand making own props First mold construction use sheet plexiglass temporay base build clay-prop combination have cut piece slightly larger prop am molding use plexiglass isnt terribly critical just gives something smooth convenient handle shaping clay around prop After shaping clay under prop use several short screws attach plexi glass wooden box made pieces 1 X 2 pine box designed part finished mold provides conve nient way contain resin mold will cast later box also provides additional strength mold after finished Another item use button made piece nylon teflon rod large larger diameter hub prop button placed top prop before mold material added remains part mold button provides smooth straight surface portion mold will eventually form front hub props make have using epoxy mold material rather polyester described article Some sort filled epoxy best purpose found too thick use since hard get corners mold yet let air bubbles escape invariably get trapped found can add thinner unfilled epoxy thick filled types create suitable casting material just about thickness desire turns out rather expensive though since takes about 15 ounces resin make female half mold about 12 ounces make male half found large tubes steel-filled epoxy Sears about $350 mixed equally Hobbypoxy II get very good casting material resulted about $750 Sears also sells silica-filled epoxy thats sand-filled really feels way can also thinned Formula II equivalent However spend little time can find filled epoxy designed expressly Continued page 107 FILL WITH MOLD RESIN ii HUB PLEXIGLASS NYLON BUTTON PREPARING THE FEMALE-HALF OF MOLD CROSS SECTION THRU PROP HUB XI PINE x FILL WITH MOLD RESIN j77 4zz NYLON BUTTON SHAPED FOR K/B HUB PREPARING THE MALE-HALF OF MOLD 40 Model Aviation Between races 1 97B Nats Pete Storrie snapped gettIng K&B-powered Slow nat tune Pilot Mike Wheeler would fly few laps after adjustment check results ALUMINUM ANGLE Ix 2 PINE C LAY lowered away bearers about V8 get correct run dont engine will go rich inverted unless Norm Whittle ended up spray bar almost er clunk tank engine goes lean inverted engines need some break-in time block several flights before start come-in much time needed break-in familiar ST 46 Paul sets engine about 8250 rpm ground Tach using 5% Nitro fuel Rev-up 126 prop Aldrich wide-bar plug will probably have use least 55 oz larger tank Anyone further ideas HP-40 other contemporary engines such Max 40 45s K&B 40s good old ST 46 please write thoughts Nationals 1979 Lincoln Nebraska dates set July 30 Monday through August 4 Saturday stunt flying will follow schedule used last two years MondaySet up judges training TuesdayJunior Senior stunt morning two separate circles Half-A stunt afternoon age classes Wednesday ThursdayOpen stunt qualifying two official flights day either three four circles fliers Friday Semi-finals Open stunt top qualifiers circle flying two officials determine final placing 6th through 20th places top five scorers advancing Final-Finals Walker Cup flyoff Saturday SaturdayFinals Open stunt top five flying three official flights through five placing top Open score compared against flights Junior Senior champions determine Walker Cup winner Judges tabulators runners recorders pit persons pull-test people scoreboard writers go-fers refreshment experts needed volunteer help maintain outstanding reputation PAMPA has earned running Nationals Precision Aerobatics Volunteer writing Keith Trostle 10900 Phillips Drive Upper Marlboro MD 20870 Judges re ceive some remuneration AMA working Other workers can receive free years dues AMA three days work information PAMPA stunt write Wynn Paul 1640 Maywick Drive Lexington KY 40504 CL Racing/Lee continued page 40 mold making Look local yellow pages under plastics resins etc find source supply Most epoxies produced few manufacturers retailers buying bulk repackaging under own brand name might also check some local marketing people Peanut Scale Peanut Scale models eubber powered flying models scaled real aircealt Span stricfly limited 13 may Ilown indoors Outdoors Steeling Peanuts fun build ton fly Designed erperts remark ably realistic appearance grout flyers material reguired kit models encept glue & dope paint addition need pliers straight pins hammer tweezers single edge razor bladetlat building board Saran Wray similar L major oil companies since usually produce epoxies Since work Shell Oil Co able easily obtain information Im sure local marketing representative would happy help asked have ended up using Hysol brand silicafilled casting resin C94 183 H2 3561 hardener combination quite thin forms good mold yet nearly expensive Sears since must buy larger quantities estimate complete both halves mold can made less $500 quite discount $1 4$ 15 other way can buy resin gallon quantities about $35 per gallon hardener quarts about $25 know sounds like quite lot money can make quite lot molds much material hardener also same use prop itself other thing strengthen mold insert piece aluminum angle lengthwise mold spreads load out mold clamp down making prop See drawings illustration pieces go together similar tricks making male half mold illustrated drawings Second prop construction prop will molding consists some sort fiber arranged appropriate order stuck together some sort resin either polyester epoxy selec Name Addeess ________________Cv.....State......Zc tion resin fiber very critical properties resulting propeller have talked several people have built props what use resin have indicated Shell EPON 815 TETA hardener 815 very thin high quality resin exhibits pot life about 30 minutes possible room temperature cure resin/hardener com bination produces very good props excellent heat resistance capability ever recommend combination very important reason safety Shell literature have able find rates both products ANSI classification 4 5 strong sensi tizer extremely irritating fact Shell has discontinued sales TETA presum ably toxicity reasons Vic Garner using combination relates some very uncomfortable skin reactions after taking precaution using gloves handling mixture have found Hysol resin R92039 quite suitable used previ ously mentioned 3561 hardener com bination especially good resistance impact thermal shock according Hysol literature yet very thin has acceptable high temperature resistance Hysol rates 3561 SPI Classification 5 2039 4183 SPI Classification 2 somewhat better 81 5/TETA case must exercise caution using resins Always use some form protective gloves keep resins off April 1979 107 STERLING MODELS 0 ST PIIILA PA 19134 no dcci avariabie direct orders acceytnd ti tO additiedal merge mr Sacatieg shyerrrg bus minimum e US 5t25 minimum eurside USI 7 Catateg entre line airplane contnI line model bits c scale Trainer kits beat medei kits arcesseries err enclosed z secrets ci Model Airpiane Buriding Incieding design censiructren cenering trnrsrerrg tiring adlusting conirci systems etc 25C enele sad C tier, ot Centroi tine Carrie Fining including eretligni seleng stunting Carrier rules regulariens Carrier tiring tintS central lee insraiiaiion insiruoliens 25C enciosed connects Only 05 merry Orders currency accepted hands avoid breathing vapors much possible fiber use prop also gives prop great deal its final characteris tics Fiberglass fibers commonly used can easily obtained cutting stripping piece extra heavy glass cloth Another fiber commonly used al though harder obtain carbon fiber new miracle fibers showing up lot exotic places Carbon better graphite fiber available small quantities Union Carbide company manufactures prod uct trade name Thornell priced neighborhood $ 3235 per pound recommend WYP-1 5 grade yarn prop making Now really very expensive since will use about 1/4 ounce fiber typical 8 prop time get pound stuff shipped you will end up spending about $40 Ill list some addresses have end column get ready start loading fibers mold very important get thoroughly saturated resin attempt mold itself will succeed damaging PVA release coating may very well destroy mold after prop has cured Get large sheet aluminum other non porous material Put fibers sheet arranged order intend lay mold Now pour some mixed resin over whole mess use epoxy brush work resin fibers laying aluminum sheet Once saturated pick up using point knife fingers lay gently mold positioning want lie little liquid resin mold will enable place fibers easily Get lot fibers hub very important since dont want voids very critical area Once have fibers place pour remain der resin mold place mold together should get fair amount resin oozing out mold few fibers possible Just keep everything covered wax paper spilled resin will easy dispose hardened also good put small piece light fiberglass cloth center tip prop lay fibers gives prop increased resistance splitting tips Once resin has set up no longer runny prop can cured ultimate strength quickly application heat Place mold prop oven set about 150 200 degrees F couple hours might optimal cure schedule resin use epoxies investigated benefited cure schedule elevated temperatures have let prop heat time remove mold/prop assembly oven careful mold hot can burn little pinkies very careful can get prop out mold whole thing hot mold will break easily hot careful have release agent PVA properly applied mold will almost pop apart hot Sources Puffer Supply Co 112 Meyerland Plaza Suite 23 Houston TX 77096 phone 713 6689457 Distributor Houston Hysol brand epoxies source epoxy resins mold props Union Carbide Corp Carbon Products Div David C Lowery 120 S River side Plara Chicago IL Source Thornell Carbon Fiber Bill Lee 3522 Tamarisk Lane Missou ri City TX 77459 CL Combat/Johnson continued page 41 Sasnett will continue newsletter editors MACA membership may yours sending $600 MACA NIL Editors 1443 McKinley Ave Escondido CA 92027 Jordan Segal 8314 W Oak Ave Chicago IL 60648 site MACA Nats will either Chicago Nashville depending possible runoff between top finishers recent poll Some innovations FAI tried during Gemini Models proudly presents new SUPER CHAMP sport trainer & fn irnIn Any u u r t,y tub .u uutu $5495 balsa & ply ABS tips cowl Rolled plans hand cut parts Wing snaps off new invention Bob Jones Span 56 area 600 sq ht 31/41/ engine 20-35 New snap wing No ugly rubber bands No screwey bolts GEMINI MODELS INC 311 Lakeview Ave Cliffon NJ 07011 201 772-9474 ordors propaid ay shipping doposit reauirod CODs December FAI contest San Diego Paul Smith used ladder elimination system proposed team trials later last year An itemized tally contes tants score available listing air time cuts points lost various infractions position ladder Probably best offensive flying meet done Greg Hill using Hoffelt Monoboom primary plane own design backup final score something like 784 points Greg fully taped streamers let get little cuts rather tearing whole thing off Best defensive flying done Paul Smith using Cartier FAI Bumblebee trying avoid letting Greg Hill get cut after Paul given him couple opening shots Cartier design very best planes Ive ever flown lowlevel maneuvers Paul used advantage jockeying inches off ground trying keep ground plane between Greg streamer Greg avoided hitting ground about three minutes finally got cut Paul came up air new minus points FAI defensive abilities will put test since can no longer get cut two build up enough air time margin land Actually youll able come up minus scores over 200 points Youve probably noticed Fast Slow Combat rules getting real workover again cycle good bad its bound happen two years Once its too late cross proposals Ill let something thats missing present rule book no seems have noticed still designs planes FAI competitors around world have voiced opinions what direction event should take changes years off common suggestion go 60-foot lines order slow things down Going 70s Fast Slow wouldnt bad idea either use Alky/oil fuel may worth considering because increasing cost USA unavailability Europe minus points rule think aimed USA because Europeans think well spend time 108 Model Aviation RUBBER STRIP FAI RUBBER ENDORSED BY BEST US RUBBER FLIERS MADE IN US SIZES 1/4 3/16 1/8 3/32 1/16 1mm THICK 042 SPOOLED GROSS WEIGHT 1 POUND PRICE PER SPOOL PPD IN US ADDITIONAL SPOOLS $860 NEW PIRELLI SIZES 6mm 5mm 4mm BY 1mm PRICE $1300 PER HANK PPD IN US ADDITIONAL HANKS $1250 SOLE US DISTRIBUTOR AND WORLDWIDE SALES FAIModel Supply P0 Box 9778 Phoenix Ariaona 85068 EEirscAIE NOKUNG WORLDS LARGEST MASTER MODELS Ass T GIANTS OF ABOUT 5-10 FT SPANS Catalog Subscription $1 Bill $110 Check No, SE Pit, LOt 260 Ph ft lOt SAS Eata hdodd ith Ctiog 70 Roylet Go Boo $39 01 Moeqoito Bowb $39 62 Coti Howk 969 $15 90 Stuo lop 9717 $45 95 Monocotpe Opt 039 99 RI Widow 961 $49 01 FokI, DVIII Pt $39 71 Duo0 DC 3 CdT$ 62 Howard 1k Rut $39 95 Doog DC 3 C 47 $49 78 OTt WoddoIWo $39 60 Doco Mu p M2 $29 70 Jio Wed.Wou $39 73 TroonI Air 6009 $ 62 Mt McIIiuo $39 107 Motin 01 Bow $ 64 Reok C17O Stog $39 69 Lindbg NX21 1 $ 54 cokkoed Elootro $20 91 Lindbgu NX2II $3 03 Otirno 7W SB7 $15 54 Puirdtild PT36 $25 74 TL Poeto Opotiol $49 60 Jook JUOO BMR $25 63 Gron Skyrooltt $34 03 Siooon.$I DIV $3 75 topobli lou Boo $34 10 Goku GIV Rood $ 90 LokIod Hodo $42 100 Sikonky S30 $ 77 Boo B17G Fort $35 100 Hnd.Poo 0400 $4 192 Roe B17G Fort $49 64 Boh.Jg B5133 $3 67 N A, Ryoo No $39 50 B-W Bird Biplor $3 73 NA Mitoholl B-25 $39 6$ RW Bird Riplono $3 65 M Mooroder B36 $39 ADO 10% ALL ORDER Onor 1000 PIone Bin. SOoUpmd
Edition: Model Aviation - 1979/04
Page Numbers: 40, 107, 108
THE September October 1978 issues Model Aviation contained very inter esting two-part article Tom Hail Larry Fagan make fiberglass props found very timely article since wanting try hand some time have some very teresting experiences props other manufacture anxious try some ideas own seemed would best start glass prop raw materials rather wood problem no suitable props available play So must make own Larry Toms article provided impetus needed laying out some needed informa tion techniques Shortly after September issue came out attended 78 Nats Lake Charles spent some time talking several people have also done some glass prop work Two notable names provided formation Les Pardue Albuquer que New Mexico Walt Perkins Ocala Florida Les Flipper half Whipper Flipper team Phil Shew being strong arm handle Walt Perkins guy behind Shadow Racing best sources FAI Team Race items among some finest carbon-fiber props can find prop John Ballard used win Goodyear Nats last year Shadow prop Another source information Vic Gamer Livermore California Some experiences have some techniques have developed stolen might interest anybody might wanting try hand making own props First mold construction use sheet plexiglass temporay base build clay-prop combination have cut piece slightly larger prop am molding use plexiglass isnt terribly critical just gives something smooth convenient handle shaping clay around prop After shaping clay under prop use several short screws attach plexi glass wooden box made pieces 1 X 2 pine box designed part finished mold provides conve nient way contain resin mold will cast later box also provides additional strength mold after finished Another item use button made piece nylon teflon rod large larger diameter hub prop button placed top prop before mold material added remains part mold button provides smooth straight surface portion mold will eventually form front hub props make have using epoxy mold material rather polyester described article Some sort filled epoxy best purpose found too thick use since hard get corners mold yet let air bubbles escape invariably get trapped found can add thinner unfilled epoxy thick filled types create suitable casting material just about thickness desire turns out rather expensive though since takes about 15 ounces resin make female half mold about 12 ounces make male half found large tubes steel-filled epoxy Sears about $350 mixed equally Hobbypoxy II get very good casting material resulted about $750 Sears also sells silica-filled epoxy thats sand-filled really feels way can also thinned Formula II equivalent However spend little time can find filled epoxy designed expressly Continued page 107 FILL WITH MOLD RESIN ii HUB PLEXIGLASS NYLON BUTTON PREPARING THE FEMALE-HALF OF MOLD CROSS SECTION THRU PROP HUB XI PINE x FILL WITH MOLD RESIN j77 4zz NYLON BUTTON SHAPED FOR K/B HUB PREPARING THE MALE-HALF OF MOLD 40 Model Aviation Between races 1 97B Nats Pete Storrie snapped gettIng K&B-powered Slow nat tune Pilot Mike Wheeler would fly few laps after adjustment check results ALUMINUM ANGLE Ix 2 PINE C LAY lowered away bearers about V8 get correct run dont engine will go rich inverted unless Norm Whittle ended up spray bar almost er clunk tank engine goes lean inverted engines need some break-in time block several flights before start come-in much time needed break-in familiar ST 46 Paul sets engine about 8250 rpm ground Tach using 5% Nitro fuel Rev-up 126 prop Aldrich wide-bar plug will probably have use least 55 oz larger tank Anyone further ideas HP-40 other contemporary engines such Max 40 45s K&B 40s good old ST 46 please write thoughts Nationals 1979 Lincoln Nebraska dates set July 30 Monday through August 4 Saturday stunt flying will follow schedule used last two years MondaySet up judges training TuesdayJunior Senior stunt morning two separate circles Half-A stunt afternoon age classes Wednesday ThursdayOpen stunt qualifying two official flights day either three four circles fliers Friday Semi-finals Open stunt top qualifiers circle flying two officials determine final placing 6th through 20th places top five scorers advancing Final-Finals Walker Cup flyoff Saturday SaturdayFinals Open stunt top five flying three official flights through five placing top Open score compared against flights Junior Senior champions determine Walker Cup winner Judges tabulators runners recorders pit persons pull-test people scoreboard writers go-fers refreshment experts needed volunteer help maintain outstanding reputation PAMPA has earned running Nationals Precision Aerobatics Volunteer writing Keith Trostle 10900 Phillips Drive Upper Marlboro MD 20870 Judges re ceive some remuneration AMA working Other workers can receive free years dues AMA three days work information PAMPA stunt write Wynn Paul 1640 Maywick Drive Lexington KY 40504 CL Racing/Lee continued page 40 mold making Look local yellow pages under plastics resins etc find source supply Most epoxies produced few manufacturers retailers buying bulk repackaging under own brand name might also check some local marketing people Peanut Scale Peanut Scale models eubber powered flying models scaled real aircealt Span stricfly limited 13 may Ilown indoors Outdoors Steeling Peanuts fun build ton fly Designed erperts remark ably realistic appearance grout flyers material reguired kit models encept glue & dope paint addition need pliers straight pins hammer tweezers single edge razor bladetlat building board Saran Wray similar L major oil companies since usually produce epoxies Since work Shell Oil Co able easily obtain information Im sure local marketing representative would happy help asked have ended up using Hysol brand silicafilled casting resin C94 183 H2 3561 hardener combination quite thin forms good mold yet nearly expensive Sears since must buy larger quantities estimate complete both halves mold can made less $500 quite discount $1 4$ 15 other way can buy resin gallon quantities about $35 per gallon hardener quarts about $25 know sounds like quite lot money can make quite lot molds much material hardener also same use prop itself other thing strengthen mold insert piece aluminum angle lengthwise mold spreads load out mold clamp down making prop See drawings illustration pieces go together similar tricks making male half mold illustrated drawings Second prop construction prop will molding consists some sort fiber arranged appropriate order stuck together some sort resin either polyester epoxy selec Name Addeess ________________Cv.....State......Zc tion resin fiber very critical properties resulting propeller have talked several people have built props what use resin have indicated Shell EPON 815 TETA hardener 815 very thin high quality resin exhibits pot life about 30 minutes possible room temperature cure resin/hardener com bination produces very good props excellent heat resistance capability ever recommend combination very important reason safety Shell literature have able find rates both products ANSI classification 4 5 strong sensi tizer extremely irritating fact Shell has discontinued sales TETA presum ably toxicity reasons Vic Garner using combination relates some very uncomfortable skin reactions after taking precaution using gloves handling mixture have found Hysol resin R92039 quite suitable used previ ously mentioned 3561 hardener com bination especially good resistance impact thermal shock according Hysol literature yet very thin has acceptable high temperature resistance Hysol rates 3561 SPI Classification 5 2039 4183 SPI Classification 2 somewhat better 81 5/TETA case must exercise caution using resins Always use some form protective gloves keep resins off April 1979 107 STERLING MODELS 0 ST PIIILA PA 19134 no dcci avariabie direct orders acceytnd ti tO additiedal merge mr Sacatieg shyerrrg bus minimum e US 5t25 minimum eurside USI 7 Catateg entre line airplane contnI line model bits c scale Trainer kits beat medei kits arcesseries err enclosed z secrets ci Model Airpiane Buriding Incieding design censiructren cenering trnrsrerrg tiring adlusting conirci systems etc 25C enele sad C tier, ot Centroi tine Carrie Fining including eretligni seleng stunting Carrier rules regulariens Carrier tiring tintS central lee insraiiaiion insiruoliens 25C enciosed connects Only 05 merry Orders currency accepted hands avoid breathing vapors much possible fiber use prop also gives prop great deal its final characteris tics Fiberglass fibers commonly used can easily obtained cutting stripping piece extra heavy glass cloth Another fiber commonly used al though harder obtain carbon fiber new miracle fibers showing up lot exotic places Carbon better graphite fiber available small quantities Union Carbide company manufactures prod uct trade name Thornell priced neighborhood $ 3235 per pound recommend WYP-1 5 grade yarn prop making Now really very expensive since will use about 1/4 ounce fiber typical 8 prop time get pound stuff shipped you will end up spending about $40 Ill list some addresses have end column get ready start loading fibers mold very important get thoroughly saturated resin attempt mold itself will succeed damaging PVA release coating may very well destroy mold after prop has cured Get large sheet aluminum other non porous material Put fibers sheet arranged order intend lay mold Now pour some mixed resin over whole mess use epoxy brush work resin fibers laying aluminum sheet Once saturated pick up using point knife fingers lay gently mold positioning want lie little liquid resin mold will enable place fibers easily Get lot fibers hub very important since dont want voids very critical area Once have fibers place pour remain der resin mold place mold together should get fair amount resin oozing out mold few fibers possible Just keep everything covered wax paper spilled resin will easy dispose hardened also good put small piece light fiberglass cloth center tip prop lay fibers gives prop increased resistance splitting tips Once resin has set up no longer runny prop can cured ultimate strength quickly application heat Place mold prop oven set about 150 200 degrees F couple hours might optimal cure schedule resin use epoxies investigated benefited cure schedule elevated temperatures have let prop heat time remove mold/prop assembly oven careful mold hot can burn little pinkies very careful can get prop out mold whole thing hot mold will break easily hot careful have release agent PVA properly applied mold will almost pop apart hot Sources Puffer Supply Co 112 Meyerland Plaza Suite 23 Houston TX 77096 phone 713 6689457 Distributor Houston Hysol brand epoxies source epoxy resins mold props Union Carbide Corp Carbon Products Div David C Lowery 120 S River side Plara Chicago IL Source Thornell Carbon Fiber Bill Lee 3522 Tamarisk Lane Missou ri City TX 77459 CL Combat/Johnson continued page 41 Sasnett will continue newsletter editors MACA membership may yours sending $600 MACA NIL Editors 1443 McKinley Ave Escondido CA 92027 Jordan Segal 8314 W Oak Ave Chicago IL 60648 site MACA Nats will either Chicago Nashville depending possible runoff between top finishers recent poll Some innovations FAI tried during Gemini Models proudly presents new SUPER CHAMP sport trainer & fn irnIn Any u u r t,y tub .u uutu $5495 balsa & ply ABS tips cowl Rolled plans hand cut parts Wing snaps off new invention Bob Jones Span 56 area 600 sq ht 31/41/ engine 20-35 New snap wing No ugly rubber bands No screwey bolts GEMINI MODELS INC 311 Lakeview Ave Cliffon NJ 07011 201 772-9474 ordors propaid ay shipping doposit reauirod CODs December FAI contest San Diego Paul Smith used ladder elimination system proposed team trials later last year An itemized tally contes tants score available listing air time cuts points lost various infractions position ladder Probably best offensive flying meet done Greg Hill using Hoffelt Monoboom primary plane own design backup final score something like 784 points Greg fully taped streamers let get little cuts rather tearing whole thing off Best defensive flying done Paul Smith using Cartier FAI Bumblebee trying avoid letting Greg Hill get cut after Paul given him couple opening shots Cartier design very best planes Ive ever flown lowlevel maneuvers Paul used advantage jockeying inches off ground trying keep ground plane between Greg streamer Greg avoided hitting ground about three minutes finally got cut Paul came up air new minus points FAI defensive abilities will put test since can no longer get cut two build up enough air time margin land Actually youll able come up minus scores over 200 points Youve probably noticed Fast Slow Combat rules getting real workover again cycle good bad its bound happen two years Once its too late cross proposals Ill let something thats missing present rule book no seems have noticed still designs planes FAI competitors around world have voiced opinions what direction event should take changes years off common suggestion go 60-foot lines order slow things down Going 70s Fast Slow wouldnt bad idea either use Alky/oil fuel may worth considering because increasing cost USA unavailability Europe minus points rule think aimed USA because Europeans think well spend time 108 Model Aviation RUBBER STRIP FAI RUBBER ENDORSED BY BEST US RUBBER FLIERS MADE IN US SIZES 1/4 3/16 1/8 3/32 1/16 1mm THICK 042 SPOOLED GROSS WEIGHT 1 POUND PRICE PER SPOOL PPD IN US ADDITIONAL SPOOLS $860 NEW PIRELLI SIZES 6mm 5mm 4mm BY 1mm PRICE $1300 PER HANK PPD IN US ADDITIONAL HANKS $1250 SOLE US DISTRIBUTOR AND WORLDWIDE SALES FAIModel Supply P0 Box 9778 Phoenix Ariaona 85068 EEirscAIE NOKUNG WORLDS LARGEST MASTER MODELS Ass T GIANTS OF ABOUT 5-10 FT SPANS Catalog Subscription $1 Bill $110 Check No, SE Pit, LOt 260 Ph ft lOt SAS Eata hdodd ith Ctiog 70 Roylet Go Boo $39 01 Moeqoito Bowb $39 62 Coti Howk 969 $15 90 Stuo lop 9717 $45 95 Monocotpe Opt 039 99 RI Widow 961 $49 01 FokI, DVIII Pt $39 71 Duo0 DC 3 CdT$ 62 Howard 1k Rut $39 95 Doog DC 3 C 47 $49 78 OTt WoddoIWo $39 60 Doco Mu p M2 $29 70 Jio Wed.Wou $39 73 TroonI Air 6009 $ 62 Mt McIIiuo $39 107 Motin 01 Bow $ 64 Reok C17O Stog $39 69 Lindbg NX21 1 $ 54 cokkoed Elootro $20 91 Lindbgu NX2II $3 03 Otirno 7W SB7 $15 54 Puirdtild PT36 $25 74 TL Poeto Opotiol $49 60 Jook JUOO BMR $25 63 Gron Skyrooltt $34 03 Siooon.$I DIV $3 75 topobli lou Boo $34 10 Goku GIV Rood $ 90 LokIod Hodo $42 100 Sikonky S30 $ 77 Boo B17G Fort $35 100 Hnd.Poo 0400 $4 192 Roe B17G Fort $49 64 Boh.Jg B5133 $3 67 N A, Ryoo No $39 50 B-W Bird Biplor $3 73 NA Mitoholl B-25 $39 6$ RW Bird Riplono $3 65 M Mooroder B36 $39 ADO 10% ALL ORDER Onor 1000 PIone Bin. SOoUpmd
Edition: Model Aviation - 1979/04
Page Numbers: 40, 107, 108
THE September October 1978 issues Model Aviation contained very inter esting two-part article Tom Hail Larry Fagan make fiberglass props found very timely article since wanting try hand some time have some very teresting experiences props other manufacture anxious try some ideas own seemed would best start glass prop raw materials rather wood problem no suitable props available play So must make own Larry Toms article provided impetus needed laying out some needed informa tion techniques Shortly after September issue came out attended 78 Nats Lake Charles spent some time talking several people have also done some glass prop work Two notable names provided formation Les Pardue Albuquer que New Mexico Walt Perkins Ocala Florida Les Flipper half Whipper Flipper team Phil Shew being strong arm handle Walt Perkins guy behind Shadow Racing best sources FAI Team Race items among some finest carbon-fiber props can find prop John Ballard used win Goodyear Nats last year Shadow prop Another source information Vic Gamer Livermore California Some experiences have some techniques have developed stolen might interest anybody might wanting try hand making own props First mold construction use sheet plexiglass temporay base build clay-prop combination have cut piece slightly larger prop am molding use plexiglass isnt terribly critical just gives something smooth convenient handle shaping clay around prop After shaping clay under prop use several short screws attach plexi glass wooden box made pieces 1 X 2 pine box designed part finished mold provides conve nient way contain resin mold will cast later box also provides additional strength mold after finished Another item use button made piece nylon teflon rod large larger diameter hub prop button placed top prop before mold material added remains part mold button provides smooth straight surface portion mold will eventually form front hub props make have using epoxy mold material rather polyester described article Some sort filled epoxy best purpose found too thick use since hard get corners mold yet let air bubbles escape invariably get trapped found can add thinner unfilled epoxy thick filled types create suitable casting material just about thickness desire turns out rather expensive though since takes about 15 ounces resin make female half mold about 12 ounces make male half found large tubes steel-filled epoxy Sears about $350 mixed equally Hobbypoxy II get very good casting material resulted about $750 Sears also sells silica-filled epoxy thats sand-filled really feels way can also thinned Formula II equivalent However spend little time can find filled epoxy designed expressly Continued page 107 FILL WITH MOLD RESIN ii HUB PLEXIGLASS NYLON BUTTON PREPARING THE FEMALE-HALF OF MOLD CROSS SECTION THRU PROP HUB XI PINE x FILL WITH MOLD RESIN j77 4zz NYLON BUTTON SHAPED FOR K/B HUB PREPARING THE MALE-HALF OF MOLD 40 Model Aviation Between races 1 97B Nats Pete Storrie snapped gettIng K&B-powered Slow nat tune Pilot Mike Wheeler would fly few laps after adjustment check results ALUMINUM ANGLE Ix 2 PINE C LAY lowered away bearers about V8 get correct run dont engine will go rich inverted unless Norm Whittle ended up spray bar almost er clunk tank engine goes lean inverted engines need some break-in time block several flights before start come-in much time needed break-in familiar ST 46 Paul sets engine about 8250 rpm ground Tach using 5% Nitro fuel Rev-up 126 prop Aldrich wide-bar plug will probably have use least 55 oz larger tank Anyone further ideas HP-40 other contemporary engines such Max 40 45s K&B 40s good old ST 46 please write thoughts Nationals 1979 Lincoln Nebraska dates set July 30 Monday through August 4 Saturday stunt flying will follow schedule used last two years MondaySet up judges training TuesdayJunior Senior stunt morning two separate circles Half-A stunt afternoon age classes Wednesday ThursdayOpen stunt qualifying two official flights day either three four circles fliers Friday Semi-finals Open stunt top qualifiers circle flying two officials determine final placing 6th through 20th places top five scorers advancing Final-Finals Walker Cup flyoff Saturday SaturdayFinals Open stunt top five flying three official flights through five placing top Open score compared against flights Junior Senior champions determine Walker Cup winner Judges tabulators runners recorders pit persons pull-test people scoreboard writers go-fers refreshment experts needed volunteer help maintain outstanding reputation PAMPA has earned running Nationals Precision Aerobatics Volunteer writing Keith Trostle 10900 Phillips Drive Upper Marlboro MD 20870 Judges re ceive some remuneration AMA working Other workers can receive free years dues AMA three days work information PAMPA stunt write Wynn Paul 1640 Maywick Drive Lexington KY 40504 CL Racing/Lee continued page 40 mold making Look local yellow pages under plastics resins etc find source supply Most epoxies produced few manufacturers retailers buying bulk repackaging under own brand name might also check some local marketing people Peanut Scale Peanut Scale models eubber powered flying models scaled real aircealt Span stricfly limited 13 may Ilown indoors Outdoors Steeling Peanuts fun build ton fly Designed erperts remark ably realistic appearance grout flyers material reguired kit models encept glue & dope paint addition need pliers straight pins hammer tweezers single edge razor bladetlat building board Saran Wray similar L major oil companies since usually produce epoxies Since work Shell Oil Co able easily obtain information Im sure local marketing representative would happy help asked have ended up using Hysol brand silicafilled casting resin C94 183 H2 3561 hardener combination quite thin forms good mold yet nearly expensive Sears since must buy larger quantities estimate complete both halves mold can made less $500 quite discount $1 4$ 15 other way can buy resin gallon quantities about $35 per gallon hardener quarts about $25 know sounds like quite lot money can make quite lot molds much material hardener also same use prop itself other thing strengthen mold insert piece aluminum angle lengthwise mold spreads load out mold clamp down making prop See drawings illustration pieces go together similar tricks making male half mold illustrated drawings Second prop construction prop will molding consists some sort fiber arranged appropriate order stuck together some sort resin either polyester epoxy selec Name Addeess ________________Cv.....State......Zc tion resin fiber very critical properties resulting propeller have talked several people have built props what use resin have indicated Shell EPON 815 TETA hardener 815 very thin high quality resin exhibits pot life about 30 minutes possible room temperature cure resin/hardener com bination produces very good props excellent heat resistance capability ever recommend combination very important reason safety Shell literature have able find rates both products ANSI classification 4 5 strong sensi tizer extremely irritating fact Shell has discontinued sales TETA presum ably toxicity reasons Vic Garner using combination relates some very uncomfortable skin reactions after taking precaution using gloves handling mixture have found Hysol resin R92039 quite suitable used previ ously mentioned 3561 hardener com bination especially good resistance impact thermal shock according Hysol literature yet very thin has acceptable high temperature resistance Hysol rates 3561 SPI Classification 5 2039 4183 SPI Classification 2 somewhat better 81 5/TETA case must exercise caution using resins Always use some form protective gloves keep resins off April 1979 107 STERLING MODELS 0 ST PIIILA PA 19134 no dcci avariabie direct orders acceytnd ti tO additiedal merge mr Sacatieg shyerrrg bus minimum e US 5t25 minimum eurside USI 7 Catateg entre line airplane contnI line model bits c scale Trainer kits beat medei kits arcesseries err enclosed z secrets ci Model Airpiane Buriding Incieding design censiructren cenering trnrsrerrg tiring adlusting conirci systems etc 25C enele sad C tier, ot Centroi tine Carrie Fining including eretligni seleng stunting Carrier rules regulariens Carrier tiring tintS central lee insraiiaiion insiruoliens 25C enciosed connects Only 05 merry Orders currency accepted hands avoid breathing vapors much possible fiber use prop also gives prop great deal its final characteris tics Fiberglass fibers commonly used can easily obtained cutting stripping piece extra heavy glass cloth Another fiber commonly used al though harder obtain carbon fiber new miracle fibers showing up lot exotic places Carbon better graphite fiber available small quantities Union Carbide company manufactures prod uct trade name Thornell priced neighborhood $ 3235 per pound recommend WYP-1 5 grade yarn prop making Now really very expensive since will use about 1/4 ounce fiber typical 8 prop time get pound stuff shipped you will end up spending about $40 Ill list some addresses have end column get ready start loading fibers mold very important get thoroughly saturated resin attempt mold itself will succeed damaging PVA release coating may very well destroy mold after prop has cured Get large sheet aluminum other non porous material Put fibers sheet arranged order intend lay mold Now pour some mixed resin over whole mess use epoxy brush work resin fibers laying aluminum sheet Once saturated pick up using point knife fingers lay gently mold positioning want lie little liquid resin mold will enable place fibers easily Get lot fibers hub very important since dont want voids very critical area Once have fibers place pour remain der resin mold place mold together should get fair amount resin oozing out mold few fibers possible Just keep everything covered wax paper spilled resin will easy dispose hardened also good put small piece light fiberglass cloth center tip prop lay fibers gives prop increased resistance splitting tips Once resin has set up no longer runny prop can cured ultimate strength quickly application heat Place mold prop oven set about 150 200 degrees F couple hours might optimal cure schedule resin use epoxies investigated benefited cure schedule elevated temperatures have let prop heat time remove mold/prop assembly oven careful mold hot can burn little pinkies very careful can get prop out mold whole thing hot mold will break easily hot careful have release agent PVA properly applied mold will almost pop apart hot Sources Puffer Supply Co 112 Meyerland Plaza Suite 23 Houston TX 77096 phone 713 6689457 Distributor Houston Hysol brand epoxies source epoxy resins mold props Union Carbide Corp Carbon Products Div David C Lowery 120 S River side Plara Chicago IL Source Thornell Carbon Fiber Bill Lee 3522 Tamarisk Lane Missou ri City TX 77459 CL Combat/Johnson continued page 41 Sasnett will continue newsletter editors MACA membership may yours sending $600 MACA NIL Editors 1443 McKinley Ave Escondido CA 92027 Jordan Segal 8314 W Oak Ave Chicago IL 60648 site MACA Nats will either Chicago Nashville depending possible runoff between top finishers recent poll Some innovations FAI tried during Gemini Models proudly presents new SUPER CHAMP sport trainer & fn irnIn Any u u r t,y tub .u uutu $5495 balsa & ply ABS tips cowl Rolled plans hand cut parts Wing snaps off new invention Bob Jones Span 56 area 600 sq ht 31/41/ engine 20-35 New snap wing No ugly rubber bands No screwey bolts GEMINI MODELS INC 311 Lakeview Ave Cliffon NJ 07011 201 772-9474 ordors propaid ay shipping doposit reauirod CODs December FAI contest San Diego Paul Smith used ladder elimination system proposed team trials later last year An itemized tally contes tants score available listing air time cuts points lost various infractions position ladder Probably best offensive flying meet done Greg Hill using Hoffelt Monoboom primary plane own design backup final score something like 784 points Greg fully taped streamers let get little cuts rather tearing whole thing off Best defensive flying done Paul Smith using Cartier FAI Bumblebee trying avoid letting Greg Hill get cut after Paul given him couple opening shots Cartier design very best planes Ive ever flown lowlevel maneuvers Paul used advantage jockeying inches off ground trying keep ground plane between Greg streamer Greg avoided hitting ground about three minutes finally got cut Paul came up air new minus points FAI defensive abilities will put test since can no longer get cut two build up enough air time margin land Actually youll able come up minus scores over 200 points Youve probably noticed Fast Slow Combat rules getting real workover again cycle good bad its bound happen two years Once its too late cross proposals Ill let something thats missing present rule book no seems have noticed still designs planes FAI competitors around world have voiced opinions what direction event should take changes years off common suggestion go 60-foot lines order slow things down Going 70s Fast Slow wouldnt bad idea either use Alky/oil fuel may worth considering because increasing cost USA unavailability Europe minus points rule think aimed USA because Europeans think well spend time 108 Model Aviation RUBBER STRIP FAI RUBBER ENDORSED BY BEST US RUBBER FLIERS MADE IN US SIZES 1/4 3/16 1/8 3/32 1/16 1mm THICK 042 SPOOLED GROSS WEIGHT 1 POUND PRICE PER SPOOL PPD IN US ADDITIONAL SPOOLS $860 NEW PIRELLI SIZES 6mm 5mm 4mm BY 1mm PRICE $1300 PER HANK PPD IN US ADDITIONAL HANKS $1250 SOLE US DISTRIBUTOR AND WORLDWIDE SALES FAIModel Supply P0 Box 9778 Phoenix Ariaona 85068 EEirscAIE NOKUNG WORLDS LARGEST MASTER MODELS Ass T GIANTS OF ABOUT 5-10 FT SPANS Catalog Subscription $1 Bill $110 Check No, SE Pit, LOt 260 Ph ft lOt SAS Eata hdodd ith Ctiog 70 Roylet Go Boo $39 01 Moeqoito Bowb $39 62 Coti Howk 969 $15 90 Stuo lop 9717 $45 95 Monocotpe Opt 039 99 RI Widow 961 $49 01 FokI, DVIII Pt $39 71 Duo0 DC 3 CdT$ 62 Howard 1k Rut $39 95 Doog DC 3 C 47 $49 78 OTt WoddoIWo $39 60 Doco Mu p M2 $29 70 Jio Wed.Wou $39 73 TroonI Air 6009 $ 62 Mt McIIiuo $39 107 Motin 01 Bow $ 64 Reok C17O Stog $39 69 Lindbg NX21 1 $ 54 cokkoed Elootro $20 91 Lindbgu NX2II $3 03 Otirno 7W SB7 $15 54 Puirdtild PT36 $25 74 TL Poeto Opotiol $49 60 Jook JUOO BMR $25 63 Gron Skyrooltt $34 03 Siooon.$I DIV $3 75 topobli lou Boo $34 10 Goku GIV Rood $ 90 LokIod Hodo $42 100 Sikonky S30 $ 77 Boo B17G Fort $35 100 Hnd.Poo 0400 $4 192 Roe B17G Fort $49 64 Boh.Jg B5133 $3 67 N A, Ryoo No $39 50 B-W Bird Biplor $3 73 NA Mitoholl B-25 $39 6$ RW Bird Riplono $3 65 M Mooroder B36 $39 ADO 10% ALL ORDER Onor 1000 PIone Bin. 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