ne ultImaTe mcroriim-covered model huge600 sq area mike jobwas used Erv Rodemskystanding 1 974toran unsuccessful assault FAI Indoor World Record Rodemsky current Indoor World Champion plc kneeling L-R Jiri Kalina Karel Rybecky successful Indoor model flying need know properly make microfilm Indoor contributing editortakes mystery out highly important subject@ Bud Tenny IT HAS BEEN noted Indoor modeling hard just different other kinds model building has seemed difficult After Indoor modeling consists just three disciplines picking wood cutting wood moving slowly area Indoor building different almost incomprehensible microfilm-covered models high technology high performance end Indoor modeling remains real mystery build Easy B HLG Pennyplanes Peanut Scale make microfilm store cover etc whole area art just like other art simple things can improve success rest art remains doing often enough develop skill feel Microfilm covering Indoor models made pouring liquid water allowing thin film form film removed water some sort frame allowed age part drying process used cover Indoor model Put like seems like simple enough process rest simply technique art can learned Three basics absolutely necessary achieve simple process described above First must have microfilm solution pour water recommend Indoor beginner mix own solution unless has training chemistry dogged determination unlimited time about later some sources microfilm other Indoor specialty items listed end article second basic requirement making micro film sheet set strong frames can made balsa other wood Strong frames mean joints secure frame will hold its shape corners must remain square weight frame should make sag held face down horizontal position Square -in balsa wood can used frames up 6 7 wide up 18 long Square h-in stock minimum frames up 8 x 36 longer frames should heavier Unless plan use film fairly soon after has poured can arrange safe storage frames some other way June 1981 61 3 After suitable waiting period see text place frame carefully water make sure adheres film around Use officetype rubber cement frame make sticky should have box storage number frames short-term storage just pin frame wall unused room moving air room will help age film dust can gather Finally microfilm tank must constructed large flat box capable holding least 1 water several hours dimensions surface area very critical want make large sheets microfilm tank 3-ft wide 6-ft long very usable size should have least 1-ft clearance between edge largest frame edge tank common problems making microfilm surface area water tank too small microfilm tank should set up wellventilated area near drain tank can easily emptied basic tank need waterproofed buy large heavy-weight plastic drop-cloth just purpose use nothing else other uses should leave chemical traces plastic water can become contaminated hinder formation strong sheet film Similarly soap should notbe used plastic should protected mechanical damage Trying pour micro film tank has pinhole plastic like living time bomb keep 62 Model Aviation 1 plastic squeeze bottle smaii teflon rods graduated holes teflon make handy pouring spoutgives repeatable results 2 pouring spout poised foraction isyalved using little finger regulate flow Note arm relaxed spout very close water avoid splashing solution 4 Simultaneously siiue Trame TOrward lilt tront edge allow air under Continue moving forward lift Comes right off 5 left frame almost clear water Note forward movement must continue film stressed very much 6 right Drain water off film admire handiworkl film doesnt dry rapidly small pieces filmfrom previous poursstick film rinse water poured carefully down length film None difficult takes practice acquire technique wondering can finish pouring before leak gets big enough work through tank get floor Carefully dry plastic sheet after use fold loosely storage technique pouring microfilm also simple just need practice idea pour thin stream microfilm solution water getting liquid evenly distributed Dont start very edge tank dont pour such long stream solution spreading film has crowd outer edge tank Photo 1 shows handy pour spout greatly eases task uniform pouring top plastic squeeze bottle has cut away rest bottle spout has cut off until 3/16-in teflon rod tight fit end Anumberofdifferent pieces teflon cutoff drilled different size phnto shows interchangeable orifices used pouring spout made machinists drills between #30 #49 orifices stored simple rack keep sorted out use pour spout filled depth 1 orifice stoppered little finger Photo 2 shows spout held little finger covering orifice except film solution allowed flow reason pouring much film amount solution spout wont change appreciably empty solution Onto water hydraulic terms head liquid weight liquid above spout doesnt change very much rate flow doesnt change much either Now have pour spout will dispense uniform stream liquid other component smooth pour uniform sweeping motion over water Again refer Photo 2 note arm relaxed free move line across length tank Use water practice try get sweep across tank comfortable enough easy maintain uniform speed Practice starting flow unstopping orifice little finger stopping flow can repeatably start stop sweep about 8 10 end tank Lets discuss rest procedure Once sheet film has poured allow remain water few minutesthe exact time will differ somewhat different days different film solutions microfilm frame must made adhere film can pick up easiest way found brush coat rubber cement face frame will contact film water just before pouring film solvents will have evaporated cement before need frame Photo 3 shows frame being placed film lay flat film torn corner frame Once frame adheres film around check carefully push frame toward edge tank direction excess film bunches up Grab excess film tear loose frame Try avoid leaving tiny pieces film water might stick future sheets film Photo 4 shows start lifting sheet film rear frame has depressed slightly front edge raised slightly clear edge film water Push frame away you rotate frame upwards Photo 5 frame except back edge free water Photo 6 hoop held above water excess water drains off should noted some kinds microfilm drain absolutely clean clear very quickly others retain thin film water awhile latter kinds film some builders prefer use distilled water rinse film before dries completely Photo 7 shows film has drained rinsed ready store away Storage microfilm mentioned earlier Photo 8 shows box will store six frames film safety box constructed gluing bottom flaps together white furniture glue Next two -in square strips wood glued bottom box form rack strip several short segments tapered wood glued form V just wider thickness frame side box both ends similar Vs placedcarefully aligned bottom should noted size box determines length frame should about half inch clearance between frame box Once film has stopped dripping can stored box After pouring session box closed tightly put safe place Keep mind basic sequence discuss number fine tuning points First water temperature tank sometimes thought crijical water much warmer cooler room temperature will hard keep temperature have little trouble water between 750 850Fslightly cool touch water should poured about 15 minutes ahead first attempt pour film allow water temperature tank equalize probably will necessary mix hot cold water get desired temperature sure water temperature uniform have stored microfilm solution should vigorously shaken about hour before using bubbles generated can dissipate pouring film solution spout guard against generating bubbles will make thin spots pinholes poured sheet After pouring sheet allow excess film solution drain back container Rinse spout acetone another container discard rinse material after pouring session Some photos show layer newspaper beneath tank gives early warning pinholes leaks plastic paper shows leak immediately after fill tank make decision will allow puddles floor miserly am holes plastic can patched vinyl mending tape some plastic industrial contact cement Now comes hard partmicrofilm pouring has reputation being sometimes thing somewhat black art unjustified since film solution worked well last week may yield single sheet tonight After lot experimentation research have found several reasons such inconsistency assume no chemical contamination tank water some kinds city water heavily treated microfilm pouring difficult distilled water will fix problem approximately same room temperature have two major variables June1981 63 Continued page 134 7 lettl rinsed drained SHim ready tO store away safely untill ready use possible new film should aged several weeks before applying model 8 right cardboard box tight lid can converted microfilm storage box some pieces balsa support separate frames described text Following authors tips will enhance chances success REVOLUTIONARY NEW CHARGER C-50/4 MEN AUTOMATIC R/C SYSTEM CHARGER Extends life nicadi Extends capacity nicad Adds reliability nicads never before achieved charger Restores marginal batteries full power potential Batteries can left charge indefinitely damaging cells Fast chargesautomat ically Renders other chargers obsolete Now after i/o years development testing MEN Inc confidently intro duces its revolutionary C-50/4 Auto matic Pulse R/G System Charger unlike other charger have ever used DC charger pulsed charger therefore operates differently giving different resuha suitable control pulse height pulse rate charging batteries accomplished addition Out standing battery reliability produced charger several side benefits occur First batteries can left charger ipdefinitely simply means after flight session can put R/C system charge leave until youre ready fly again nest day next week next yearno need ever wonder about CL Speed/Hempel passage adapter conform downward flow pattern Engine get performance tuned pipe engine must set up properly Nick Sher tells done excellent article ModelAviation May 1979 Running pipe Start engine rich needle setting As turn needle valve leaner engine should come pipe engine will need fuel happens prepared immediately open needle valve about rn needle opened too far engine will fall off pipe happens just repeat process mentioned above get engine back pipe want gratefully acknowledge support have received Luther Roy project ideas criticisms encouragement have extremely valuable excellent machining ability can observed photos pipe adapter flaring tool sincerely hope time readers column make attempt build pipe will appreciate amount effort goes putting together such constructive article hope everyone enjoys article Tell em read Model Aviation Speed column next Speed column will tell modify Cox 049/051 cylinder rpm Gene Hempel 301 North Yale St Garland TX 75042 M icrofilm/Tenny Continued page 63 Relative humidity can affect microfilm pouring sessions much atmosphenc pressure serious about pouring microfilm simple barometer will enable record barometric pressure batch microfilm solution works well pressure different great amount surprised have different results pouring session general humidity can vary quite bit hindering formation good film humidity very high solvent evaporation film warm water can go fast film will cool enough condense moisture happens possible film will blush turn cloudy white Such film will very weak probably can lifted water Try much cooler water solvents will evaporate quickly wait longer before trying lift film 4PATTERN AND04,p 4 HIGH SPEED PROPELLERS oU DUYAIRSCREWft CUSTOM HIGH PERFORMANCE MAPLE PROPELLERS Propeller designed using symmetrical profile Individually precision hand balanced Accurale airfoil pitch Only high quality straight grain Eastern Maple used 8/ X 6% FORMULA 1 lOX 6 11X7 11X7/2 11X8 CUSTOM DESIGN UPON REQUEST SW PRODUCTS 5634 CRYSTAL COURT SANTA ROSA CA 95404 PRONE 707 526SARA Add 5100 P, SiS'O SAAIig charge long charge Just plug system leave till youre ready fly again Second battery tests can done charger example can test open battery cells shorted battery cells hi-leakage cells low ca pacity cells hi-impedance cells conditions can detected early lead disaster new MEN C-S0/4 charger available 3 models cover R/C needs 48 volts/g6 volts 48 volts/60 volts 48 volts/12 volts ca pable charging systems 240 MAH through 4 amps hour capscity new MEN C-S0/4 Charger rep resents latest ate art battery chargers No serious H/C en thusiast should Royal Electronics Sid Gates says appreciate friendship help will soon have RC systems chip want information write Jerry did show Cyclecharger d is- Bradshaw 3619 Hillcrest Lane Sacramento charges recharges battery packs 16-hr CA 95821 telephone number 916 487-9620 rate Also shown prototype Digitester still under development combines functions digital pulse-width meter digital voltmeter digital tach via option kitsitll also have outputs serve bench power supply battery charger servo cycler George hopes get hands describe regular Radio Tech nique column ANNOUNCING THE INTRODUCTION OF THE ALL NEW NELSON COMPETITION 15 ENGINE STANDARD AND R/C AVAILABLE JUNE 1 1981 complete formation send large stamped self-addressed envelope Kustom Kraftsmanship P0 Box 2699 Laguna Hills CA 92653 Dealer inquiries invited 134 Model Aviation microfilm solution known good some problems can anticipated allowed First sure can see least gold color film study film water Silver film very lightest no color visible have no reference point decide good silver film thin too weak lift some color can seen sure entire area covered frame will gold heavier sure frame attached film around Otherwise tearing excess film frame small tear may made inside frame area Unless film tough boot leather very likely tear point since lifting film puts large stress sheet Microfilm formed complex spreading process begins stream solution hits water After initial spreading sheet shrinks slightly before becoming stable During pouring action rapid spreading directions tries occur basic action forward direction pour side balance solvents solution wrong atmospheric pressure too low spreading will go too far weak silver film will produced Iry warmer water speed solvent evaporation pour film edge tank will help limit spreading last very touchy since just bit too much solution water will cause uneven thickness near edges extreme cases excess film will hinder spreading much liquid solution remains center very thick film will produced film can lifted safely breaks frame drying try waiting longer next time before lifting film likely film once spread still shrinking Attaching frame stopped shrinking finally film pulled itself apart hallmarks good microfilm supposed very color may true subtle variations color across sheet often almost impossible avoid abrupt color changes solution running too fast rate arm sweep large temperature changes water Pinholes thin spots indicate air bubbles solution splash hits water double line abrupt color changes line indicates faulty sheet will lift some reason solution separating during pour Try shaking solution wait bubbles disperse solution should totally free bubbles poured uniform sweep close water possible get plowing water go Finally separate panels film separated tiny cracks tells really bad pouring technique spoiled film solution some TIC R/C PRODUCTS Rt 1 Box 282 Prospect VA 23901 No other prop pulls biggie like DY NAT H RUST other gross deviation good practice Microfilm usually made nitrocellulose very much like nitrate clear dope chemical composition Two major differences dope intended shrink liquid microfilm must thin enough pour easily onto water Anyone plans mix own needs consider following items 1 Nitrocellulose NC produced variety speeds related fast standard metal sphere will drop through standard NC solution contained tube standard diameter rating measure long NC molecular chains microfilm made -second NC will make very weak film uneven color Five- six-second NC probably lower limit very long-chain NC will very strong have high tendency adhere itself 2 often almost impossible guarantee Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER P0KV RESINK&B SUPER P0KV RtSIN K&B SUPER P0KV PRIMER K&B SUPER POXY PAINT K&B MIXING CUPS Now experience full motor potential Dynathrusts 100% accurate pitch airfoil Costs less buy fly because its unequaled durability 15 6 pitch $ 700 18 6 8 pitch $1000 20 8 10 pitch $1400 Prices include UPS charges MC 0 VISA 0 COD 0 CHECK 0 MO 3TrRoINcJ 2541 NE 11th Court Pompano Beach Florida 33062 1-305-941-9119 Dealer Inquiries Invited grade NC used make given batch dope other nitrocellulose product base Therefore buy batch NC has dissolved specified mix solvents may work welL may able get another batch exactly same stuff batch microfilm can vary frustrating manner 3 Solvent balance has mentioned refers using mixture solvents its own rate evaporation example acetone very fast methyl ethyl ketone medium speed solvent amyl acetate slow blend solvents must right film spreads just right water evens itself out uniform thickness before stopping its spread quits shrinking reasonable time Determina tion proper solvent balance grade NC very time-consuming trial-and-error P0 Box 3957 Torrance CA 90510 June 1981 135 See dealer order direct Inuu urTormunu TOP PERFORMAi K&B ENGINES Airplane 4 Marine K&B FUtLS K&B GLOW PLUGS 7 Blends4 chnscen Fast realistic aerobatic kit features ABS wheelpants moulded canopy pre-bent wire Send $2500 plus $500 shipping RUBBER STRIP FAI RUBBER 4 out S flyoff 1979 World Championships used FAI RUBBER Made USA SIZES % 3/16 7/8 3/32 1/16 1mm 042 thick SPOOLED GROSS WT 1-ks 1-% LBS PRICE $1250 first spool PPD US Additional spools $1250 NEW PIRELLI SIZES 6mm 5mm 4mm X 1mm PRICE $1500 first hank PPD US Additional spools $1450 Sole US Distributor World-Wide Sales Send 25 cents 1980 Catalog Reach Stars 11th ANNUAL MODEL AERONAUTIC S SCHOLARSHIP CONTEST JULY 11& 12 1981 ATTENTION ERS process required solvent balance varies fairly rapidly different grades speeds NC different water temperatures different atmospheric pressures 4 Raw nitrocellulose film brittle will literally shatter under stress Therefore microfilm must contain substance known plasticizer enables film endure stress Too much plasticizer will make film sticky attract dust some plasticizers exude sheet very soon after pouring sheet gets both sticky brittle Selection plasticizer involves life-testing film sure nothing bad happens soit might take couple years design good mixthat cant duplicate because problems suppliers Have fun must mix own film solution use Over $3500 I Scholarships awarded plus trophies through 3rd Place 21 Scholarship Events An open contest will also held 12 events Main categories Free flight Control line Specialty events Rocketry Boeing Aerospace Company Kent Washington near Seattle detailed information application form write call Boeing Management Assoc PO Box 3707 Seattle WA 98124 L Attn Don Connell Org 2-3951 MS BK-61 206 773-1338 good techniques keep exacting records Record water temperature air temperature rela tive humidity atmospheric pressure Make several sizes film frames storage boxes match smallest frames can about 6 x 12 used take samples various tests would otherwise destroy large sheets Also particular batch does spread well has areas good color save small samples testing determine formula worth fooling sure make accurate measurements film ingredients mix various recipes use graduated chemistry beakers similar glassware mixing Pour NC first use solvents thoroughly rinse beaker Otherwise wont use NC mea sured Work toward standard amounts solution use calibrated eye-dropper glass add ingredients need small amount After mixing batch solution com pute amount ingredient percent record everything modify existing batch compute new percentages ingredient record both new formulation results trying pour new mix number simple tests can applied microfilm First cut corner film loose frameso triangular portion free move breeze Some film will behave has static chargeit will immediately flip over stick itself will pull loose easily sticky molecules NC have simply become aligned like magnets causes attraction Note repeatedly fold over such flap film will develop static charge especially wintertime Sticky film usually bunches up like accordion sticks tightly qualitative test film strength can performed small framesput half ping pong ball center film record much weight required rupture film Note such tests should compare like film colors surprised takes lot weight break film Film stabilityhow much will shrink should performed building model part such stabilizer covering Store covered stab box several months checking periodically warps extra tightness takes long time can prevent model warps film stable Tests sticky film vary very effective method build some small flat frames such model rudders cover lay together film sides touching rudders can separated easily film OK Remember several such tests quickly film will stick static charge other test often valid pin small frame film wall direct electric fan constant action air should loosen film frame becomes loose wrinkled Beware film quickly recovers gets smooth tight frame againit may unstable doesnt tighten completely probably will good use method also ages film quickly need use sooner otherwise should Happy flying Sources following suppliers specialists Indoor model supplies sell microfilm solutions various quantities Aerolite 36659 Ledgestone Mt Clemens MI 48043 Indoor Model Supply PO Box C Garberville CA 95440 Micro-X Products PO Box 1063-A Lorain OH 44055 SAFE FLYING IS NO ACCIDENT FF Duration/Meuser Continued page 65 Well see still business new ones join throngnext year about same time Engine-Uriy Schroeder Schroeder Roger 4111 W 98 St. Overland Park KS 66207 616 3334375 dy 1913 648-4265 cv Casting kits Windsong OT engine Morton M-5 prop OaR 136 Model Aviation EPOXY GLASS COWLS FOR NOSEN PICA Sb MORGAN BALSA USA PLAIT CONCEPT FLEEt HOSTETLER ACM T-CRAFT SHEBER P1775 ft SCALE SUPER CUB FOKKER 0-7 BOEING P- /2 P-2B F4B2 F4B4 SPARROW HA WE GEE BEE MOO Y MACBR/ENS TURBULENT CHRISTEN EAGLE BRIS/OHELLAS STAROUSTER II SCALE J3-BI BABY FLYBABY AIRCAMPER PILOT JUNGMANN 735 SCALE & OTHERS WHEEL PANTS FOR C/TA BR/A STAROUS TEA II P/iTS SKYBOL T LIBEATYSPORT CHRIS TEN EAGLE PBE HA WE STEARMAN STINSON SR-B MULLIGAN & OTHERS BRAZED & HEAT-TREATED WIRE GEARS&CABANES LARGE SCALE PLANS AVAILABLE DISCOUNT ON COWL WHEN PLANS ARE PURCHASED Send SASE tar latest list supply Modelers fiberglass parts plansWrite call us T & D FIBERGLASS SPECIALTIES 30525 SLOCK GARDEN CITY MI 48135 PHONE 313 421-6358
Edition: Model Aviation - 1981/06
Page Numbers: 61, 62, 63, 134, 135, 136
ne ultImaTe mcroriim-covered model huge600 sq area mike jobwas used Erv Rodemskystanding 1 974toran unsuccessful assault FAI Indoor World Record Rodemsky current Indoor World Champion plc kneeling L-R Jiri Kalina Karel Rybecky successful Indoor model flying need know properly make microfilm Indoor contributing editortakes mystery out highly important subject@ Bud Tenny IT HAS BEEN noted Indoor modeling hard just different other kinds model building has seemed difficult After Indoor modeling consists just three disciplines picking wood cutting wood moving slowly area Indoor building different almost incomprehensible microfilm-covered models high technology high performance end Indoor modeling remains real mystery build Easy B HLG Pennyplanes Peanut Scale make microfilm store cover etc whole area art just like other art simple things can improve success rest art remains doing often enough develop skill feel Microfilm covering Indoor models made pouring liquid water allowing thin film form film removed water some sort frame allowed age part drying process used cover Indoor model Put like seems like simple enough process rest simply technique art can learned Three basics absolutely necessary achieve simple process described above First must have microfilm solution pour water recommend Indoor beginner mix own solution unless has training chemistry dogged determination unlimited time about later some sources microfilm other Indoor specialty items listed end article second basic requirement making micro film sheet set strong frames can made balsa other wood Strong frames mean joints secure frame will hold its shape corners must remain square weight frame should make sag held face down horizontal position Square -in balsa wood can used frames up 6 7 wide up 18 long Square h-in stock minimum frames up 8 x 36 longer frames should heavier Unless plan use film fairly soon after has poured can arrange safe storage frames some other way June 1981 61 3 After suitable waiting period see text place frame carefully water make sure adheres film around Use officetype rubber cement frame make sticky should have box storage number frames short-term storage just pin frame wall unused room moving air room will help age film dust can gather Finally microfilm tank must constructed large flat box capable holding least 1 water several hours dimensions surface area very critical want make large sheets microfilm tank 3-ft wide 6-ft long very usable size should have least 1-ft clearance between edge largest frame edge tank common problems making microfilm surface area water tank too small microfilm tank should set up wellventilated area near drain tank can easily emptied basic tank need waterproofed buy large heavy-weight plastic drop-cloth just purpose use nothing else other uses should leave chemical traces plastic water can become contaminated hinder formation strong sheet film Similarly soap should notbe used plastic should protected mechanical damage Trying pour micro film tank has pinhole plastic like living time bomb keep 62 Model Aviation 1 plastic squeeze bottle smaii teflon rods graduated holes teflon make handy pouring spoutgives repeatable results 2 pouring spout poised foraction isyalved using little finger regulate flow Note arm relaxed spout very close water avoid splashing solution 4 Simultaneously siiue Trame TOrward lilt tront edge allow air under Continue moving forward lift Comes right off 5 left frame almost clear water Note forward movement must continue film stressed very much 6 right Drain water off film admire handiworkl film doesnt dry rapidly small pieces filmfrom previous poursstick film rinse water poured carefully down length film None difficult takes practice acquire technique wondering can finish pouring before leak gets big enough work through tank get floor Carefully dry plastic sheet after use fold loosely storage technique pouring microfilm also simple just need practice idea pour thin stream microfilm solution water getting liquid evenly distributed Dont start very edge tank dont pour such long stream solution spreading film has crowd outer edge tank Photo 1 shows handy pour spout greatly eases task uniform pouring top plastic squeeze bottle has cut away rest bottle spout has cut off until 3/16-in teflon rod tight fit end Anumberofdifferent pieces teflon cutoff drilled different size phnto shows interchangeable orifices used pouring spout made machinists drills between #30 #49 orifices stored simple rack keep sorted out use pour spout filled depth 1 orifice stoppered little finger Photo 2 shows spout held little finger covering orifice except film solution allowed flow reason pouring much film amount solution spout wont change appreciably empty solution Onto water hydraulic terms head liquid weight liquid above spout doesnt change very much rate flow doesnt change much either Now have pour spout will dispense uniform stream liquid other component smooth pour uniform sweeping motion over water Again refer Photo 2 note arm relaxed free move line across length tank Use water practice try get sweep across tank comfortable enough easy maintain uniform speed Practice starting flow unstopping orifice little finger stopping flow can repeatably start stop sweep about 8 10 end tank Lets discuss rest procedure Once sheet film has poured allow remain water few minutesthe exact time will differ somewhat different days different film solutions microfilm frame must made adhere film can pick up easiest way found brush coat rubber cement face frame will contact film water just before pouring film solvents will have evaporated cement before need frame Photo 3 shows frame being placed film lay flat film torn corner frame Once frame adheres film around check carefully push frame toward edge tank direction excess film bunches up Grab excess film tear loose frame Try avoid leaving tiny pieces film water might stick future sheets film Photo 4 shows start lifting sheet film rear frame has depressed slightly front edge raised slightly clear edge film water Push frame away you rotate frame upwards Photo 5 frame except back edge free water Photo 6 hoop held above water excess water drains off should noted some kinds microfilm drain absolutely clean clear very quickly others retain thin film water awhile latter kinds film some builders prefer use distilled water rinse film before dries completely Photo 7 shows film has drained rinsed ready store away Storage microfilm mentioned earlier Photo 8 shows box will store six frames film safety box constructed gluing bottom flaps together white furniture glue Next two -in square strips wood glued bottom box form rack strip several short segments tapered wood glued form V just wider thickness frame side box both ends similar Vs placedcarefully aligned bottom should noted size box determines length frame should about half inch clearance between frame box Once film has stopped dripping can stored box After pouring session box closed tightly put safe place Keep mind basic sequence discuss number fine tuning points First water temperature tank sometimes thought crijical water much warmer cooler room temperature will hard keep temperature have little trouble water between 750 850Fslightly cool touch water should poured about 15 minutes ahead first attempt pour film allow water temperature tank equalize probably will necessary mix hot cold water get desired temperature sure water temperature uniform have stored microfilm solution should vigorously shaken about hour before using bubbles generated can dissipate pouring film solution spout guard against generating bubbles will make thin spots pinholes poured sheet After pouring sheet allow excess film solution drain back container Rinse spout acetone another container discard rinse material after pouring session Some photos show layer newspaper beneath tank gives early warning pinholes leaks plastic paper shows leak immediately after fill tank make decision will allow puddles floor miserly am holes plastic can patched vinyl mending tape some plastic industrial contact cement Now comes hard partmicrofilm pouring has reputation being sometimes thing somewhat black art unjustified since film solution worked well last week may yield single sheet tonight After lot experimentation research have found several reasons such inconsistency assume no chemical contamination tank water some kinds city water heavily treated microfilm pouring difficult distilled water will fix problem approximately same room temperature have two major variables June1981 63 Continued page 134 7 lettl rinsed drained SHim ready tO store away safely untill ready use possible new film should aged several weeks before applying model 8 right cardboard box tight lid can converted microfilm storage box some pieces balsa support separate frames described text Following authors tips will enhance chances success REVOLUTIONARY NEW CHARGER C-50/4 MEN AUTOMATIC R/C SYSTEM CHARGER Extends life nicadi Extends capacity nicad Adds reliability nicads never before achieved charger Restores marginal batteries full power potential Batteries can left charge indefinitely damaging cells Fast chargesautomat ically Renders other chargers obsolete Now after i/o years development testing MEN Inc confidently intro duces its revolutionary C-50/4 Auto matic Pulse R/G System Charger unlike other charger have ever used DC charger pulsed charger therefore operates differently giving different resuha suitable control pulse height pulse rate charging batteries accomplished addition Out standing battery reliability produced charger several side benefits occur First batteries can left charger ipdefinitely simply means after flight session can put R/C system charge leave until youre ready fly again nest day next week next yearno need ever wonder about CL Speed/Hempel passage adapter conform downward flow pattern Engine get performance tuned pipe engine must set up properly Nick Sher tells done excellent article ModelAviation May 1979 Running pipe Start engine rich needle setting As turn needle valve leaner engine should come pipe engine will need fuel happens prepared immediately open needle valve about rn needle opened too far engine will fall off pipe happens just repeat process mentioned above get engine back pipe want gratefully acknowledge support have received Luther Roy project ideas criticisms encouragement have extremely valuable excellent machining ability can observed photos pipe adapter flaring tool sincerely hope time readers column make attempt build pipe will appreciate amount effort goes putting together such constructive article hope everyone enjoys article Tell em read Model Aviation Speed column next Speed column will tell modify Cox 049/051 cylinder rpm Gene Hempel 301 North Yale St Garland TX 75042 M icrofilm/Tenny Continued page 63 Relative humidity can affect microfilm pouring sessions much atmosphenc pressure serious about pouring microfilm simple barometer will enable record barometric pressure batch microfilm solution works well pressure different great amount surprised have different results pouring session general humidity can vary quite bit hindering formation good film humidity very high solvent evaporation film warm water can go fast film will cool enough condense moisture happens possible film will blush turn cloudy white Such film will very weak probably can lifted water Try much cooler water solvents will evaporate quickly wait longer before trying lift film 4PATTERN AND04,p 4 HIGH SPEED PROPELLERS oU DUYAIRSCREWft CUSTOM HIGH PERFORMANCE MAPLE PROPELLERS Propeller designed using symmetrical profile Individually precision hand balanced Accurale airfoil pitch Only high quality straight grain Eastern Maple used 8/ X 6% FORMULA 1 lOX 6 11X7 11X7/2 11X8 CUSTOM DESIGN UPON REQUEST SW PRODUCTS 5634 CRYSTAL COURT SANTA ROSA CA 95404 PRONE 707 526SARA Add 5100 P, SiS'O SAAIig charge long charge Just plug system leave till youre ready fly again Second battery tests can done charger example can test open battery cells shorted battery cells hi-leakage cells low ca pacity cells hi-impedance cells conditions can detected early lead disaster new MEN C-S0/4 charger available 3 models cover R/C needs 48 volts/g6 volts 48 volts/60 volts 48 volts/12 volts ca pable charging systems 240 MAH through 4 amps hour capscity new MEN C-S0/4 Charger rep resents latest ate art battery chargers No serious H/C en thusiast should Royal Electronics Sid Gates says appreciate friendship help will soon have RC systems chip want information write Jerry did show Cyclecharger d is- Bradshaw 3619 Hillcrest Lane Sacramento charges recharges battery packs 16-hr CA 95821 telephone number 916 487-9620 rate Also shown prototype Digitester still under development combines functions digital pulse-width meter digital voltmeter digital tach via option kitsitll also have outputs serve bench power supply battery charger servo cycler George hopes get hands describe regular Radio Tech nique column ANNOUNCING THE INTRODUCTION OF THE ALL NEW NELSON COMPETITION 15 ENGINE STANDARD AND R/C AVAILABLE JUNE 1 1981 complete formation send large stamped self-addressed envelope Kustom Kraftsmanship P0 Box 2699 Laguna Hills CA 92653 Dealer inquiries invited 134 Model Aviation microfilm solution known good some problems can anticipated allowed First sure can see least gold color film study film water Silver film very lightest no color visible have no reference point decide good silver film thin too weak lift some color can seen sure entire area covered frame will gold heavier sure frame attached film around Otherwise tearing excess film frame small tear may made inside frame area Unless film tough boot leather very likely tear point since lifting film puts large stress sheet Microfilm formed complex spreading process begins stream solution hits water After initial spreading sheet shrinks slightly before becoming stable During pouring action rapid spreading directions tries occur basic action forward direction pour side balance solvents solution wrong atmospheric pressure too low spreading will go too far weak silver film will produced Iry warmer water speed solvent evaporation pour film edge tank will help limit spreading last very touchy since just bit too much solution water will cause uneven thickness near edges extreme cases excess film will hinder spreading much liquid solution remains center very thick film will produced film can lifted safely breaks frame drying try waiting longer next time before lifting film likely film once spread still shrinking Attaching frame stopped shrinking finally film pulled itself apart hallmarks good microfilm supposed very color may true subtle variations color across sheet often almost impossible avoid abrupt color changes solution running too fast rate arm sweep large temperature changes water Pinholes thin spots indicate air bubbles solution splash hits water double line abrupt color changes line indicates faulty sheet will lift some reason solution separating during pour Try shaking solution wait bubbles disperse solution should totally free bubbles poured uniform sweep close water possible get plowing water go Finally separate panels film separated tiny cracks tells really bad pouring technique spoiled film solution some TIC R/C PRODUCTS Rt 1 Box 282 Prospect VA 23901 No other prop pulls biggie like DY NAT H RUST other gross deviation good practice Microfilm usually made nitrocellulose very much like nitrate clear dope chemical composition Two major differences dope intended shrink liquid microfilm must thin enough pour easily onto water Anyone plans mix own needs consider following items 1 Nitrocellulose NC produced variety speeds related fast standard metal sphere will drop through standard NC solution contained tube standard diameter rating measure long NC molecular chains microfilm made -second NC will make very weak film uneven color Five- six-second NC probably lower limit very long-chain NC will very strong have high tendency adhere itself 2 often almost impossible guarantee Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER P0KV RESINK&B SUPER P0KV RtSIN K&B SUPER P0KV PRIMER K&B SUPER POXY PAINT K&B MIXING CUPS Now experience full motor potential Dynathrusts 100% accurate pitch airfoil Costs less buy fly because its unequaled durability 15 6 pitch $ 700 18 6 8 pitch $1000 20 8 10 pitch $1400 Prices include UPS charges MC 0 VISA 0 COD 0 CHECK 0 MO 3TrRoINcJ 2541 NE 11th Court Pompano Beach Florida 33062 1-305-941-9119 Dealer Inquiries Invited grade NC used make given batch dope other nitrocellulose product base Therefore buy batch NC has dissolved specified mix solvents may work welL may able get another batch exactly same stuff batch microfilm can vary frustrating manner 3 Solvent balance has mentioned refers using mixture solvents its own rate evaporation example acetone very fast methyl ethyl ketone medium speed solvent amyl acetate slow blend solvents must right film spreads just right water evens itself out uniform thickness before stopping its spread quits shrinking reasonable time Determina tion proper solvent balance grade NC very time-consuming trial-and-error P0 Box 3957 Torrance CA 90510 June 1981 135 See dealer order direct Inuu urTormunu TOP PERFORMAi K&B ENGINES Airplane 4 Marine K&B FUtLS K&B GLOW PLUGS 7 Blends4 chnscen Fast realistic aerobatic kit features ABS wheelpants moulded canopy pre-bent wire Send $2500 plus $500 shipping RUBBER STRIP FAI RUBBER 4 out S flyoff 1979 World Championships used FAI RUBBER Made USA SIZES % 3/16 7/8 3/32 1/16 1mm 042 thick SPOOLED GROSS WT 1-ks 1-% LBS PRICE $1250 first spool PPD US Additional spools $1250 NEW PIRELLI SIZES 6mm 5mm 4mm X 1mm PRICE $1500 first hank PPD US Additional spools $1450 Sole US Distributor World-Wide Sales Send 25 cents 1980 Catalog Reach Stars 11th ANNUAL MODEL AERONAUTIC S SCHOLARSHIP CONTEST JULY 11& 12 1981 ATTENTION ERS process required solvent balance varies fairly rapidly different grades speeds NC different water temperatures different atmospheric pressures 4 Raw nitrocellulose film brittle will literally shatter under stress Therefore microfilm must contain substance known plasticizer enables film endure stress Too much plasticizer will make film sticky attract dust some plasticizers exude sheet very soon after pouring sheet gets both sticky brittle Selection plasticizer involves life-testing film sure nothing bad happens soit might take couple years design good mixthat cant duplicate because problems suppliers Have fun must mix own film solution use Over $3500 I Scholarships awarded plus trophies through 3rd Place 21 Scholarship Events An open contest will also held 12 events Main categories Free flight Control line Specialty events Rocketry Boeing Aerospace Company Kent Washington near Seattle detailed information application form write call Boeing Management Assoc PO Box 3707 Seattle WA 98124 L Attn Don Connell Org 2-3951 MS BK-61 206 773-1338 good techniques keep exacting records Record water temperature air temperature rela tive humidity atmospheric pressure Make several sizes film frames storage boxes match smallest frames can about 6 x 12 used take samples various tests would otherwise destroy large sheets Also particular batch does spread well has areas good color save small samples testing determine formula worth fooling sure make accurate measurements film ingredients mix various recipes use graduated chemistry beakers similar glassware mixing Pour NC first use solvents thoroughly rinse beaker Otherwise wont use NC mea sured Work toward standard amounts solution use calibrated eye-dropper glass add ingredients need small amount After mixing batch solution com pute amount ingredient percent record everything modify existing batch compute new percentages ingredient record both new formulation results trying pour new mix number simple tests can applied microfilm First cut corner film loose frameso triangular portion free move breeze Some film will behave has static chargeit will immediately flip over stick itself will pull loose easily sticky molecules NC have simply become aligned like magnets causes attraction Note repeatedly fold over such flap film will develop static charge especially wintertime Sticky film usually bunches up like accordion sticks tightly qualitative test film strength can performed small framesput half ping pong ball center film record much weight required rupture film Note such tests should compare like film colors surprised takes lot weight break film Film stabilityhow much will shrink should performed building model part such stabilizer covering Store covered stab box several months checking periodically warps extra tightness takes long time can prevent model warps film stable Tests sticky film vary very effective method build some small flat frames such model rudders cover lay together film sides touching rudders can separated easily film OK Remember several such tests quickly film will stick static charge other test often valid pin small frame film wall direct electric fan constant action air should loosen film frame becomes loose wrinkled Beware film quickly recovers gets smooth tight frame againit may unstable doesnt tighten completely probably will good use method also ages film quickly need use sooner otherwise should Happy flying Sources following suppliers specialists Indoor model supplies sell microfilm solutions various quantities Aerolite 36659 Ledgestone Mt Clemens MI 48043 Indoor Model Supply PO Box C Garberville CA 95440 Micro-X Products PO Box 1063-A Lorain OH 44055 SAFE FLYING IS NO ACCIDENT FF Duration/Meuser Continued page 65 Well see still business new ones join throngnext year about same time Engine-Uriy Schroeder Schroeder Roger 4111 W 98 St. Overland Park KS 66207 616 3334375 dy 1913 648-4265 cv Casting kits Windsong OT engine Morton M-5 prop OaR 136 Model Aviation EPOXY GLASS COWLS FOR NOSEN PICA Sb MORGAN BALSA USA PLAIT CONCEPT FLEEt HOSTETLER ACM T-CRAFT SHEBER P1775 ft SCALE SUPER CUB FOKKER 0-7 BOEING P- /2 P-2B F4B2 F4B4 SPARROW HA WE GEE BEE MOO Y MACBR/ENS TURBULENT CHRISTEN EAGLE BRIS/OHELLAS STAROUSTER II SCALE J3-BI BABY FLYBABY AIRCAMPER PILOT JUNGMANN 735 SCALE & OTHERS WHEEL PANTS FOR C/TA BR/A STAROUS TEA II P/iTS SKYBOL T LIBEATYSPORT CHRIS TEN EAGLE PBE HA WE STEARMAN STINSON SR-B MULLIGAN & OTHERS BRAZED & HEAT-TREATED WIRE GEARS&CABANES LARGE SCALE PLANS AVAILABLE DISCOUNT ON COWL WHEN PLANS ARE PURCHASED Send SASE tar latest list supply Modelers fiberglass parts plansWrite call us T & D FIBERGLASS SPECIALTIES 30525 SLOCK GARDEN CITY MI 48135 PHONE 313 421-6358
Edition: Model Aviation - 1981/06
Page Numbers: 61, 62, 63, 134, 135, 136
ne ultImaTe mcroriim-covered model huge600 sq area mike jobwas used Erv Rodemskystanding 1 974toran unsuccessful assault FAI Indoor World Record Rodemsky current Indoor World Champion plc kneeling L-R Jiri Kalina Karel Rybecky successful Indoor model flying need know properly make microfilm Indoor contributing editortakes mystery out highly important subject@ Bud Tenny IT HAS BEEN noted Indoor modeling hard just different other kinds model building has seemed difficult After Indoor modeling consists just three disciplines picking wood cutting wood moving slowly area Indoor building different almost incomprehensible microfilm-covered models high technology high performance end Indoor modeling remains real mystery build Easy B HLG Pennyplanes Peanut Scale make microfilm store cover etc whole area art just like other art simple things can improve success rest art remains doing often enough develop skill feel Microfilm covering Indoor models made pouring liquid water allowing thin film form film removed water some sort frame allowed age part drying process used cover Indoor model Put like seems like simple enough process rest simply technique art can learned Three basics absolutely necessary achieve simple process described above First must have microfilm solution pour water recommend Indoor beginner mix own solution unless has training chemistry dogged determination unlimited time about later some sources microfilm other Indoor specialty items listed end article second basic requirement making micro film sheet set strong frames can made balsa other wood Strong frames mean joints secure frame will hold its shape corners must remain square weight frame should make sag held face down horizontal position Square -in balsa wood can used frames up 6 7 wide up 18 long Square h-in stock minimum frames up 8 x 36 longer frames should heavier Unless plan use film fairly soon after has poured can arrange safe storage frames some other way June 1981 61 3 After suitable waiting period see text place frame carefully water make sure adheres film around Use officetype rubber cement frame make sticky should have box storage number frames short-term storage just pin frame wall unused room moving air room will help age film dust can gather Finally microfilm tank must constructed large flat box capable holding least 1 water several hours dimensions surface area very critical want make large sheets microfilm tank 3-ft wide 6-ft long very usable size should have least 1-ft clearance between edge largest frame edge tank common problems making microfilm surface area water tank too small microfilm tank should set up wellventilated area near drain tank can easily emptied basic tank need waterproofed buy large heavy-weight plastic drop-cloth just purpose use nothing else other uses should leave chemical traces plastic water can become contaminated hinder formation strong sheet film Similarly soap should notbe used plastic should protected mechanical damage Trying pour micro film tank has pinhole plastic like living time bomb keep 62 Model Aviation 1 plastic squeeze bottle smaii teflon rods graduated holes teflon make handy pouring spoutgives repeatable results 2 pouring spout poised foraction isyalved using little finger regulate flow Note arm relaxed spout very close water avoid splashing solution 4 Simultaneously siiue Trame TOrward lilt tront edge allow air under Continue moving forward lift Comes right off 5 left frame almost clear water Note forward movement must continue film stressed very much 6 right Drain water off film admire handiworkl film doesnt dry rapidly small pieces filmfrom previous poursstick film rinse water poured carefully down length film None difficult takes practice acquire technique wondering can finish pouring before leak gets big enough work through tank get floor Carefully dry plastic sheet after use fold loosely storage technique pouring microfilm also simple just need practice idea pour thin stream microfilm solution water getting liquid evenly distributed Dont start very edge tank dont pour such long stream solution spreading film has crowd outer edge tank Photo 1 shows handy pour spout greatly eases task uniform pouring top plastic squeeze bottle has cut away rest bottle spout has cut off until 3/16-in teflon rod tight fit end Anumberofdifferent pieces teflon cutoff drilled different size phnto shows interchangeable orifices used pouring spout made machinists drills between #30 #49 orifices stored simple rack keep sorted out use pour spout filled depth 1 orifice stoppered little finger Photo 2 shows spout held little finger covering orifice except film solution allowed flow reason pouring much film amount solution spout wont change appreciably empty solution Onto water hydraulic terms head liquid weight liquid above spout doesnt change very much rate flow doesnt change much either Now have pour spout will dispense uniform stream liquid other component smooth pour uniform sweeping motion over water Again refer Photo 2 note arm relaxed free move line across length tank Use water practice try get sweep across tank comfortable enough easy maintain uniform speed Practice starting flow unstopping orifice little finger stopping flow can repeatably start stop sweep about 8 10 end tank Lets discuss rest procedure Once sheet film has poured allow remain water few minutesthe exact time will differ somewhat different days different film solutions microfilm frame must made adhere film can pick up easiest way found brush coat rubber cement face frame will contact film water just before pouring film solvents will have evaporated cement before need frame Photo 3 shows frame being placed film lay flat film torn corner frame Once frame adheres film around check carefully push frame toward edge tank direction excess film bunches up Grab excess film tear loose frame Try avoid leaving tiny pieces film water might stick future sheets film Photo 4 shows start lifting sheet film rear frame has depressed slightly front edge raised slightly clear edge film water Push frame away you rotate frame upwards Photo 5 frame except back edge free water Photo 6 hoop held above water excess water drains off should noted some kinds microfilm drain absolutely clean clear very quickly others retain thin film water awhile latter kinds film some builders prefer use distilled water rinse film before dries completely Photo 7 shows film has drained rinsed ready store away Storage microfilm mentioned earlier Photo 8 shows box will store six frames film safety box constructed gluing bottom flaps together white furniture glue Next two -in square strips wood glued bottom box form rack strip several short segments tapered wood glued form V just wider thickness frame side box both ends similar Vs placedcarefully aligned bottom should noted size box determines length frame should about half inch clearance between frame box Once film has stopped dripping can stored box After pouring session box closed tightly put safe place Keep mind basic sequence discuss number fine tuning points First water temperature tank sometimes thought crijical water much warmer cooler room temperature will hard keep temperature have little trouble water between 750 850Fslightly cool touch water should poured about 15 minutes ahead first attempt pour film allow water temperature tank equalize probably will necessary mix hot cold water get desired temperature sure water temperature uniform have stored microfilm solution should vigorously shaken about hour before using bubbles generated can dissipate pouring film solution spout guard against generating bubbles will make thin spots pinholes poured sheet After pouring sheet allow excess film solution drain back container Rinse spout acetone another container discard rinse material after pouring session Some photos show layer newspaper beneath tank gives early warning pinholes leaks plastic paper shows leak immediately after fill tank make decision will allow puddles floor miserly am holes plastic can patched vinyl mending tape some plastic industrial contact cement Now comes hard partmicrofilm pouring has reputation being sometimes thing somewhat black art unjustified since film solution worked well last week may yield single sheet tonight After lot experimentation research have found several reasons such inconsistency assume no chemical contamination tank water some kinds city water heavily treated microfilm pouring difficult distilled water will fix problem approximately same room temperature have two major variables June1981 63 Continued page 134 7 lettl rinsed drained SHim ready tO store away safely untill ready use possible new film should aged several weeks before applying model 8 right cardboard box tight lid can converted microfilm storage box some pieces balsa support separate frames described text Following authors tips will enhance chances success REVOLUTIONARY NEW CHARGER C-50/4 MEN AUTOMATIC R/C SYSTEM CHARGER Extends life nicadi Extends capacity nicad Adds reliability nicads never before achieved charger Restores marginal batteries full power potential Batteries can left charge indefinitely damaging cells Fast chargesautomat ically Renders other chargers obsolete Now after i/o years development testing MEN Inc confidently intro duces its revolutionary C-50/4 Auto matic Pulse R/G System Charger unlike other charger have ever used DC charger pulsed charger therefore operates differently giving different resuha suitable control pulse height pulse rate charging batteries accomplished addition Out standing battery reliability produced charger several side benefits occur First batteries can left charger ipdefinitely simply means after flight session can put R/C system charge leave until youre ready fly again nest day next week next yearno need ever wonder about CL Speed/Hempel passage adapter conform downward flow pattern Engine get performance tuned pipe engine must set up properly Nick Sher tells done excellent article ModelAviation May 1979 Running pipe Start engine rich needle setting As turn needle valve leaner engine should come pipe engine will need fuel happens prepared immediately open needle valve about rn needle opened too far engine will fall off pipe happens just repeat process mentioned above get engine back pipe want gratefully acknowledge support have received Luther Roy project ideas criticisms encouragement have extremely valuable excellent machining ability can observed photos pipe adapter flaring tool sincerely hope time readers column make attempt build pipe will appreciate amount effort goes putting together such constructive article hope everyone enjoys article Tell em read Model Aviation Speed column next Speed column will tell modify Cox 049/051 cylinder rpm Gene Hempel 301 North Yale St Garland TX 75042 M icrofilm/Tenny Continued page 63 Relative humidity can affect microfilm pouring sessions much atmosphenc pressure serious about pouring microfilm simple barometer will enable record barometric pressure batch microfilm solution works well pressure different great amount surprised have different results pouring session general humidity can vary quite bit hindering formation good film humidity very high solvent evaporation film warm water can go fast film will cool enough condense moisture happens possible film will blush turn cloudy white Such film will very weak probably can lifted water Try much cooler water solvents will evaporate quickly wait longer before trying lift film 4PATTERN AND04,p 4 HIGH SPEED PROPELLERS oU DUYAIRSCREWft CUSTOM HIGH PERFORMANCE MAPLE PROPELLERS Propeller designed using symmetrical profile Individually precision hand balanced Accurale airfoil pitch Only high quality straight grain Eastern Maple used 8/ X 6% FORMULA 1 lOX 6 11X7 11X7/2 11X8 CUSTOM DESIGN UPON REQUEST SW PRODUCTS 5634 CRYSTAL COURT SANTA ROSA CA 95404 PRONE 707 526SARA Add 5100 P, SiS'O SAAIig charge long charge Just plug system leave till youre ready fly again Second battery tests can done charger example can test open battery cells shorted battery cells hi-leakage cells low ca pacity cells hi-impedance cells conditions can detected early lead disaster new MEN C-S0/4 charger available 3 models cover R/C needs 48 volts/g6 volts 48 volts/60 volts 48 volts/12 volts ca pable charging systems 240 MAH through 4 amps hour capscity new MEN C-S0/4 Charger rep resents latest ate art battery chargers No serious H/C en thusiast should Royal Electronics Sid Gates says appreciate friendship help will soon have RC systems chip want information write Jerry did show Cyclecharger d is- Bradshaw 3619 Hillcrest Lane Sacramento charges recharges battery packs 16-hr CA 95821 telephone number 916 487-9620 rate Also shown prototype Digitester still under development combines functions digital pulse-width meter digital voltmeter digital tach via option kitsitll also have outputs serve bench power supply battery charger servo cycler George hopes get hands describe regular Radio Tech nique column ANNOUNCING THE INTRODUCTION OF THE ALL NEW NELSON COMPETITION 15 ENGINE STANDARD AND R/C AVAILABLE JUNE 1 1981 complete formation send large stamped self-addressed envelope Kustom Kraftsmanship P0 Box 2699 Laguna Hills CA 92653 Dealer inquiries invited 134 Model Aviation microfilm solution known good some problems can anticipated allowed First sure can see least gold color film study film water Silver film very lightest no color visible have no reference point decide good silver film thin too weak lift some color can seen sure entire area covered frame will gold heavier sure frame attached film around Otherwise tearing excess film frame small tear may made inside frame area Unless film tough boot leather very likely tear point since lifting film puts large stress sheet Microfilm formed complex spreading process begins stream solution hits water After initial spreading sheet shrinks slightly before becoming stable During pouring action rapid spreading directions tries occur basic action forward direction pour side balance solvents solution wrong atmospheric pressure too low spreading will go too far weak silver film will produced Iry warmer water speed solvent evaporation pour film edge tank will help limit spreading last very touchy since just bit too much solution water will cause uneven thickness near edges extreme cases excess film will hinder spreading much liquid solution remains center very thick film will produced film can lifted safely breaks frame drying try waiting longer next time before lifting film likely film once spread still shrinking Attaching frame stopped shrinking finally film pulled itself apart hallmarks good microfilm supposed very color may true subtle variations color across sheet often almost impossible avoid abrupt color changes solution running too fast rate arm sweep large temperature changes water Pinholes thin spots indicate air bubbles solution splash hits water double line abrupt color changes line indicates faulty sheet will lift some reason solution separating during pour Try shaking solution wait bubbles disperse solution should totally free bubbles poured uniform sweep close water possible get plowing water go Finally separate panels film separated tiny cracks tells really bad pouring technique spoiled film solution some TIC R/C PRODUCTS Rt 1 Box 282 Prospect VA 23901 No other prop pulls biggie like DY NAT H RUST other gross deviation good practice Microfilm usually made nitrocellulose very much like nitrate clear dope chemical composition Two major differences dope intended shrink liquid microfilm must thin enough pour easily onto water Anyone plans mix own needs consider following items 1 Nitrocellulose NC produced variety speeds related fast standard metal sphere will drop through standard NC solution contained tube standard diameter rating measure long NC molecular chains microfilm made -second NC will make very weak film uneven color Five- six-second NC probably lower limit very long-chain NC will very strong have high tendency adhere itself 2 often almost impossible guarantee Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER P0KV RESINK&B SUPER P0KV RtSIN K&B SUPER P0KV PRIMER K&B SUPER POXY PAINT K&B MIXING CUPS Now experience full motor potential Dynathrusts 100% accurate pitch airfoil Costs less buy fly because its unequaled durability 15 6 pitch $ 700 18 6 8 pitch $1000 20 8 10 pitch $1400 Prices include UPS charges MC 0 VISA 0 COD 0 CHECK 0 MO 3TrRoINcJ 2541 NE 11th Court Pompano Beach Florida 33062 1-305-941-9119 Dealer Inquiries Invited grade NC used make given batch dope other nitrocellulose product base Therefore buy batch NC has dissolved specified mix solvents may work welL may able get another batch exactly same stuff batch microfilm can vary frustrating manner 3 Solvent balance has mentioned refers using mixture solvents its own rate evaporation example acetone very fast methyl ethyl ketone medium speed solvent amyl acetate slow blend solvents must right film spreads just right water evens itself out uniform thickness before stopping its spread quits shrinking reasonable time Determina tion proper solvent balance grade NC very time-consuming trial-and-error P0 Box 3957 Torrance CA 90510 June 1981 135 See dealer order direct Inuu urTormunu TOP PERFORMAi K&B ENGINES Airplane 4 Marine K&B FUtLS K&B GLOW PLUGS 7 Blends4 chnscen Fast realistic aerobatic kit features ABS wheelpants moulded canopy pre-bent wire Send $2500 plus $500 shipping RUBBER STRIP FAI RUBBER 4 out S flyoff 1979 World Championships used FAI RUBBER Made USA SIZES % 3/16 7/8 3/32 1/16 1mm 042 thick SPOOLED GROSS WT 1-ks 1-% LBS PRICE $1250 first spool PPD US Additional spools $1250 NEW PIRELLI SIZES 6mm 5mm 4mm X 1mm PRICE $1500 first hank PPD US Additional spools $1450 Sole US Distributor World-Wide Sales Send 25 cents 1980 Catalog Reach Stars 11th ANNUAL MODEL AERONAUTIC S SCHOLARSHIP CONTEST JULY 11& 12 1981 ATTENTION ERS process required solvent balance varies fairly rapidly different grades speeds NC different water temperatures different atmospheric pressures 4 Raw nitrocellulose film brittle will literally shatter under stress Therefore microfilm must contain substance known plasticizer enables film endure stress Too much plasticizer will make film sticky attract dust some plasticizers exude sheet very soon after pouring sheet gets both sticky brittle Selection plasticizer involves life-testing film sure nothing bad happens soit might take couple years design good mixthat cant duplicate because problems suppliers Have fun must mix own film solution use Over $3500 I Scholarships awarded plus trophies through 3rd Place 21 Scholarship Events An open contest will also held 12 events Main categories Free flight Control line Specialty events Rocketry Boeing Aerospace Company Kent Washington near Seattle detailed information application form write call Boeing Management Assoc PO Box 3707 Seattle WA 98124 L Attn Don Connell Org 2-3951 MS BK-61 206 773-1338 good techniques keep exacting records Record water temperature air temperature rela tive humidity atmospheric pressure Make several sizes film frames storage boxes match smallest frames can about 6 x 12 used take samples various tests would otherwise destroy large sheets Also particular batch does spread well has areas good color save small samples testing determine formula worth fooling sure make accurate measurements film ingredients mix various recipes use graduated chemistry beakers similar glassware mixing Pour NC first use solvents thoroughly rinse beaker Otherwise wont use NC mea sured Work toward standard amounts solution use calibrated eye-dropper glass add ingredients need small amount After mixing batch solution com pute amount ingredient percent record everything modify existing batch compute new percentages ingredient record both new formulation results trying pour new mix number simple tests can applied microfilm First cut corner film loose frameso triangular portion free move breeze Some film will behave has static chargeit will immediately flip over stick itself will pull loose easily sticky molecules NC have simply become aligned like magnets causes attraction Note repeatedly fold over such flap film will develop static charge especially wintertime Sticky film usually bunches up like accordion sticks tightly qualitative test film strength can performed small framesput half ping pong ball center film record much weight required rupture film Note such tests should compare like film colors surprised takes lot weight break film Film stabilityhow much will shrink should performed building model part such stabilizer covering Store covered stab box several months checking periodically warps extra tightness takes long time can prevent model warps film stable Tests sticky film vary very effective method build some small flat frames such model rudders cover lay together film sides touching rudders can separated easily film OK Remember several such tests quickly film will stick static charge other test often valid pin small frame film wall direct electric fan constant action air should loosen film frame becomes loose wrinkled Beware film quickly recovers gets smooth tight frame againit may unstable doesnt tighten completely probably will good use method also ages film quickly need use sooner otherwise should Happy flying Sources following suppliers specialists Indoor model supplies sell microfilm solutions various quantities Aerolite 36659 Ledgestone Mt Clemens MI 48043 Indoor Model Supply PO Box C Garberville CA 95440 Micro-X Products PO Box 1063-A Lorain OH 44055 SAFE FLYING IS NO ACCIDENT FF Duration/Meuser Continued page 65 Well see still business new ones join throngnext year about same time Engine-Uriy Schroeder Schroeder Roger 4111 W 98 St. Overland Park KS 66207 616 3334375 dy 1913 648-4265 cv Casting kits Windsong OT engine Morton M-5 prop OaR 136 Model Aviation EPOXY GLASS COWLS FOR NOSEN PICA Sb MORGAN BALSA USA PLAIT CONCEPT FLEEt HOSTETLER ACM T-CRAFT SHEBER P1775 ft SCALE SUPER CUB FOKKER 0-7 BOEING P- /2 P-2B F4B2 F4B4 SPARROW HA WE GEE BEE MOO Y MACBR/ENS TURBULENT CHRISTEN EAGLE BRIS/OHELLAS STAROUSTER II SCALE J3-BI BABY FLYBABY AIRCAMPER PILOT JUNGMANN 735 SCALE & OTHERS WHEEL PANTS FOR C/TA BR/A STAROUS TEA II P/iTS SKYBOL T LIBEATYSPORT CHRIS TEN EAGLE PBE HA WE STEARMAN STINSON SR-B MULLIGAN & OTHERS BRAZED & HEAT-TREATED WIRE GEARS&CABANES LARGE SCALE PLANS AVAILABLE DISCOUNT ON COWL WHEN PLANS ARE PURCHASED Send SASE tar latest list supply Modelers fiberglass parts plansWrite call us T & D FIBERGLASS SPECIALTIES 30525 SLOCK GARDEN CITY MI 48135 PHONE 313 421-6358
Edition: Model Aviation - 1981/06
Page Numbers: 61, 62, 63, 134, 135, 136
ne ultImaTe mcroriim-covered model huge600 sq area mike jobwas used Erv Rodemskystanding 1 974toran unsuccessful assault FAI Indoor World Record Rodemsky current Indoor World Champion plc kneeling L-R Jiri Kalina Karel Rybecky successful Indoor model flying need know properly make microfilm Indoor contributing editortakes mystery out highly important subject@ Bud Tenny IT HAS BEEN noted Indoor modeling hard just different other kinds model building has seemed difficult After Indoor modeling consists just three disciplines picking wood cutting wood moving slowly area Indoor building different almost incomprehensible microfilm-covered models high technology high performance end Indoor modeling remains real mystery build Easy B HLG Pennyplanes Peanut Scale make microfilm store cover etc whole area art just like other art simple things can improve success rest art remains doing often enough develop skill feel Microfilm covering Indoor models made pouring liquid water allowing thin film form film removed water some sort frame allowed age part drying process used cover Indoor model Put like seems like simple enough process rest simply technique art can learned Three basics absolutely necessary achieve simple process described above First must have microfilm solution pour water recommend Indoor beginner mix own solution unless has training chemistry dogged determination unlimited time about later some sources microfilm other Indoor specialty items listed end article second basic requirement making micro film sheet set strong frames can made balsa other wood Strong frames mean joints secure frame will hold its shape corners must remain square weight frame should make sag held face down horizontal position Square -in balsa wood can used frames up 6 7 wide up 18 long Square h-in stock minimum frames up 8 x 36 longer frames should heavier Unless plan use film fairly soon after has poured can arrange safe storage frames some other way June 1981 61 3 After suitable waiting period see text place frame carefully water make sure adheres film around Use officetype rubber cement frame make sticky should have box storage number frames short-term storage just pin frame wall unused room moving air room will help age film dust can gather Finally microfilm tank must constructed large flat box capable holding least 1 water several hours dimensions surface area very critical want make large sheets microfilm tank 3-ft wide 6-ft long very usable size should have least 1-ft clearance between edge largest frame edge tank common problems making microfilm surface area water tank too small microfilm tank should set up wellventilated area near drain tank can easily emptied basic tank need waterproofed buy large heavy-weight plastic drop-cloth just purpose use nothing else other uses should leave chemical traces plastic water can become contaminated hinder formation strong sheet film Similarly soap should notbe used plastic should protected mechanical damage Trying pour micro film tank has pinhole plastic like living time bomb keep 62 Model Aviation 1 plastic squeeze bottle smaii teflon rods graduated holes teflon make handy pouring spoutgives repeatable results 2 pouring spout poised foraction isyalved using little finger regulate flow Note arm relaxed spout very close water avoid splashing solution 4 Simultaneously siiue Trame TOrward lilt tront edge allow air under Continue moving forward lift Comes right off 5 left frame almost clear water Note forward movement must continue film stressed very much 6 right Drain water off film admire handiworkl film doesnt dry rapidly small pieces filmfrom previous poursstick film rinse water poured carefully down length film None difficult takes practice acquire technique wondering can finish pouring before leak gets big enough work through tank get floor Carefully dry plastic sheet after use fold loosely storage technique pouring microfilm also simple just need practice idea pour thin stream microfilm solution water getting liquid evenly distributed Dont start very edge tank dont pour such long stream solution spreading film has crowd outer edge tank Photo 1 shows handy pour spout greatly eases task uniform pouring top plastic squeeze bottle has cut away rest bottle spout has cut off until 3/16-in teflon rod tight fit end Anumberofdifferent pieces teflon cutoff drilled different size phnto shows interchangeable orifices used pouring spout made machinists drills between #30 #49 orifices stored simple rack keep sorted out use pour spout filled depth 1 orifice stoppered little finger Photo 2 shows spout held little finger covering orifice except film solution allowed flow reason pouring much film amount solution spout wont change appreciably empty solution Onto water hydraulic terms head liquid weight liquid above spout doesnt change very much rate flow doesnt change much either Now have pour spout will dispense uniform stream liquid other component smooth pour uniform sweeping motion over water Again refer Photo 2 note arm relaxed free move line across length tank Use water practice try get sweep across tank comfortable enough easy maintain uniform speed Practice starting flow unstopping orifice little finger stopping flow can repeatably start stop sweep about 8 10 end tank Lets discuss rest procedure Once sheet film has poured allow remain water few minutesthe exact time will differ somewhat different days different film solutions microfilm frame must made adhere film can pick up easiest way found brush coat rubber cement face frame will contact film water just before pouring film solvents will have evaporated cement before need frame Photo 3 shows frame being placed film lay flat film torn corner frame Once frame adheres film around check carefully push frame toward edge tank direction excess film bunches up Grab excess film tear loose frame Try avoid leaving tiny pieces film water might stick future sheets film Photo 4 shows start lifting sheet film rear frame has depressed slightly front edge raised slightly clear edge film water Push frame away you rotate frame upwards Photo 5 frame except back edge free water Photo 6 hoop held above water excess water drains off should noted some kinds microfilm drain absolutely clean clear very quickly others retain thin film water awhile latter kinds film some builders prefer use distilled water rinse film before dries completely Photo 7 shows film has drained rinsed ready store away Storage microfilm mentioned earlier Photo 8 shows box will store six frames film safety box constructed gluing bottom flaps together white furniture glue Next two -in square strips wood glued bottom box form rack strip several short segments tapered wood glued form V just wider thickness frame side box both ends similar Vs placedcarefully aligned bottom should noted size box determines length frame should about half inch clearance between frame box Once film has stopped dripping can stored box After pouring session box closed tightly put safe place Keep mind basic sequence discuss number fine tuning points First water temperature tank sometimes thought crijical water much warmer cooler room temperature will hard keep temperature have little trouble water between 750 850Fslightly cool touch water should poured about 15 minutes ahead first attempt pour film allow water temperature tank equalize probably will necessary mix hot cold water get desired temperature sure water temperature uniform have stored microfilm solution should vigorously shaken about hour before using bubbles generated can dissipate pouring film solution spout guard against generating bubbles will make thin spots pinholes poured sheet After pouring sheet allow excess film solution drain back container Rinse spout acetone another container discard rinse material after pouring session Some photos show layer newspaper beneath tank gives early warning pinholes leaks plastic paper shows leak immediately after fill tank make decision will allow puddles floor miserly am holes plastic can patched vinyl mending tape some plastic industrial contact cement Now comes hard partmicrofilm pouring has reputation being sometimes thing somewhat black art unjustified since film solution worked well last week may yield single sheet tonight After lot experimentation research have found several reasons such inconsistency assume no chemical contamination tank water some kinds city water heavily treated microfilm pouring difficult distilled water will fix problem approximately same room temperature have two major variables June1981 63 Continued page 134 7 lettl rinsed drained SHim ready tO store away safely untill ready use possible new film should aged several weeks before applying model 8 right cardboard box tight lid can converted microfilm storage box some pieces balsa support separate frames described text Following authors tips will enhance chances success REVOLUTIONARY NEW CHARGER C-50/4 MEN AUTOMATIC R/C SYSTEM CHARGER Extends life nicadi Extends capacity nicad Adds reliability nicads never before achieved charger Restores marginal batteries full power potential Batteries can left charge indefinitely damaging cells Fast chargesautomat ically Renders other chargers obsolete Now after i/o years development testing MEN Inc confidently intro duces its revolutionary C-50/4 Auto matic Pulse R/G System Charger unlike other charger have ever used DC charger pulsed charger therefore operates differently giving different resuha suitable control pulse height pulse rate charging batteries accomplished addition Out standing battery reliability produced charger several side benefits occur First batteries can left charger ipdefinitely simply means after flight session can put R/C system charge leave until youre ready fly again nest day next week next yearno need ever wonder about CL Speed/Hempel passage adapter conform downward flow pattern Engine get performance tuned pipe engine must set up properly Nick Sher tells done excellent article ModelAviation May 1979 Running pipe Start engine rich needle setting As turn needle valve leaner engine should come pipe engine will need fuel happens prepared immediately open needle valve about rn needle opened too far engine will fall off pipe happens just repeat process mentioned above get engine back pipe want gratefully acknowledge support have received Luther Roy project ideas criticisms encouragement have extremely valuable excellent machining ability can observed photos pipe adapter flaring tool sincerely hope time readers column make attempt build pipe will appreciate amount effort goes putting together such constructive article hope everyone enjoys article Tell em read Model Aviation Speed column next Speed column will tell modify Cox 049/051 cylinder rpm Gene Hempel 301 North Yale St Garland TX 75042 M icrofilm/Tenny Continued page 63 Relative humidity can affect microfilm pouring sessions much atmosphenc pressure serious about pouring microfilm simple barometer will enable record barometric pressure batch microfilm solution works well pressure different great amount surprised have different results pouring session general humidity can vary quite bit hindering formation good film humidity very high solvent evaporation film warm water can go fast film will cool enough condense moisture happens possible film will blush turn cloudy white Such film will very weak probably can lifted water Try much cooler water solvents will evaporate quickly wait longer before trying lift film 4PATTERN AND04,p 4 HIGH SPEED PROPELLERS oU DUYAIRSCREWft CUSTOM HIGH PERFORMANCE MAPLE PROPELLERS Propeller designed using symmetrical profile Individually precision hand balanced Accurale airfoil pitch Only high quality straight grain Eastern Maple used 8/ X 6% FORMULA 1 lOX 6 11X7 11X7/2 11X8 CUSTOM DESIGN UPON REQUEST SW PRODUCTS 5634 CRYSTAL COURT SANTA ROSA CA 95404 PRONE 707 526SARA Add 5100 P, SiS'O SAAIig charge long charge Just plug system leave till youre ready fly again Second battery tests can done charger example can test open battery cells shorted battery cells hi-leakage cells low ca pacity cells hi-impedance cells conditions can detected early lead disaster new MEN C-S0/4 charger available 3 models cover R/C needs 48 volts/g6 volts 48 volts/60 volts 48 volts/12 volts ca pable charging systems 240 MAH through 4 amps hour capscity new MEN C-S0/4 Charger rep resents latest ate art battery chargers No serious H/C en thusiast should Royal Electronics Sid Gates says appreciate friendship help will soon have RC systems chip want information write Jerry did show Cyclecharger d is- Bradshaw 3619 Hillcrest Lane Sacramento charges recharges battery packs 16-hr CA 95821 telephone number 916 487-9620 rate Also shown prototype Digitester still under development combines functions digital pulse-width meter digital voltmeter digital tach via option kitsitll also have outputs serve bench power supply battery charger servo cycler George hopes get hands describe regular Radio Tech nique column ANNOUNCING THE INTRODUCTION OF THE ALL NEW NELSON COMPETITION 15 ENGINE STANDARD AND R/C AVAILABLE JUNE 1 1981 complete formation send large stamped self-addressed envelope Kustom Kraftsmanship P0 Box 2699 Laguna Hills CA 92653 Dealer inquiries invited 134 Model Aviation microfilm solution known good some problems can anticipated allowed First sure can see least gold color film study film water Silver film very lightest no color visible have no reference point decide good silver film thin too weak lift some color can seen sure entire area covered frame will gold heavier sure frame attached film around Otherwise tearing excess film frame small tear may made inside frame area Unless film tough boot leather very likely tear point since lifting film puts large stress sheet Microfilm formed complex spreading process begins stream solution hits water After initial spreading sheet shrinks slightly before becoming stable During pouring action rapid spreading directions tries occur basic action forward direction pour side balance solvents solution wrong atmospheric pressure too low spreading will go too far weak silver film will produced Iry warmer water speed solvent evaporation pour film edge tank will help limit spreading last very touchy since just bit too much solution water will cause uneven thickness near edges extreme cases excess film will hinder spreading much liquid solution remains center very thick film will produced film can lifted safely breaks frame drying try waiting longer next time before lifting film likely film once spread still shrinking Attaching frame stopped shrinking finally film pulled itself apart hallmarks good microfilm supposed very color may true subtle variations color across sheet often almost impossible avoid abrupt color changes solution running too fast rate arm sweep large temperature changes water Pinholes thin spots indicate air bubbles solution splash hits water double line abrupt color changes line indicates faulty sheet will lift some reason solution separating during pour Try shaking solution wait bubbles disperse solution should totally free bubbles poured uniform sweep close water possible get plowing water go Finally separate panels film separated tiny cracks tells really bad pouring technique spoiled film solution some TIC R/C PRODUCTS Rt 1 Box 282 Prospect VA 23901 No other prop pulls biggie like DY NAT H RUST other gross deviation good practice Microfilm usually made nitrocellulose very much like nitrate clear dope chemical composition Two major differences dope intended shrink liquid microfilm must thin enough pour easily onto water Anyone plans mix own needs consider following items 1 Nitrocellulose NC produced variety speeds related fast standard metal sphere will drop through standard NC solution contained tube standard diameter rating measure long NC molecular chains microfilm made -second NC will make very weak film uneven color Five- six-second NC probably lower limit very long-chain NC will very strong have high tendency adhere itself 2 often almost impossible guarantee Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER P0KV RESINK&B SUPER P0KV RtSIN K&B SUPER P0KV PRIMER K&B SUPER POXY PAINT K&B MIXING CUPS Now experience full motor potential Dynathrusts 100% accurate pitch airfoil Costs less buy fly because its unequaled durability 15 6 pitch $ 700 18 6 8 pitch $1000 20 8 10 pitch $1400 Prices include UPS charges MC 0 VISA 0 COD 0 CHECK 0 MO 3TrRoINcJ 2541 NE 11th Court Pompano Beach Florida 33062 1-305-941-9119 Dealer Inquiries Invited grade NC used make given batch dope other nitrocellulose product base Therefore buy batch NC has dissolved specified mix solvents may work welL may able get another batch exactly same stuff batch microfilm can vary frustrating manner 3 Solvent balance has mentioned refers using mixture solvents its own rate evaporation example acetone very fast methyl ethyl ketone medium speed solvent amyl acetate slow blend solvents must right film spreads just right water evens itself out uniform thickness before stopping its spread quits shrinking reasonable time Determina tion proper solvent balance grade NC very time-consuming trial-and-error P0 Box 3957 Torrance CA 90510 June 1981 135 See dealer order direct Inuu urTormunu TOP PERFORMAi K&B ENGINES Airplane 4 Marine K&B FUtLS K&B GLOW PLUGS 7 Blends4 chnscen Fast realistic aerobatic kit features ABS wheelpants moulded canopy pre-bent wire Send $2500 plus $500 shipping RUBBER STRIP FAI RUBBER 4 out S flyoff 1979 World Championships used FAI RUBBER Made USA SIZES % 3/16 7/8 3/32 1/16 1mm 042 thick SPOOLED GROSS WT 1-ks 1-% LBS PRICE $1250 first spool PPD US Additional spools $1250 NEW PIRELLI SIZES 6mm 5mm 4mm X 1mm PRICE $1500 first hank PPD US Additional spools $1450 Sole US Distributor World-Wide Sales Send 25 cents 1980 Catalog Reach Stars 11th ANNUAL MODEL AERONAUTIC S SCHOLARSHIP CONTEST JULY 11& 12 1981 ATTENTION ERS process required solvent balance varies fairly rapidly different grades speeds NC different water temperatures different atmospheric pressures 4 Raw nitrocellulose film brittle will literally shatter under stress Therefore microfilm must contain substance known plasticizer enables film endure stress Too much plasticizer will make film sticky attract dust some plasticizers exude sheet very soon after pouring sheet gets both sticky brittle Selection plasticizer involves life-testing film sure nothing bad happens soit might take couple years design good mixthat cant duplicate because problems suppliers Have fun must mix own film solution use Over $3500 I Scholarships awarded plus trophies through 3rd Place 21 Scholarship Events An open contest will also held 12 events Main categories Free flight Control line Specialty events Rocketry Boeing Aerospace Company Kent Washington near Seattle detailed information application form write call Boeing Management Assoc PO Box 3707 Seattle WA 98124 L Attn Don Connell Org 2-3951 MS BK-61 206 773-1338 good techniques keep exacting records Record water temperature air temperature rela tive humidity atmospheric pressure Make several sizes film frames storage boxes match smallest frames can about 6 x 12 used take samples various tests would otherwise destroy large sheets Also particular batch does spread well has areas good color save small samples testing determine formula worth fooling sure make accurate measurements film ingredients mix various recipes use graduated chemistry beakers similar glassware mixing Pour NC first use solvents thoroughly rinse beaker Otherwise wont use NC mea sured Work toward standard amounts solution use calibrated eye-dropper glass add ingredients need small amount After mixing batch solution com pute amount ingredient percent record everything modify existing batch compute new percentages ingredient record both new formulation results trying pour new mix number simple tests can applied microfilm First cut corner film loose frameso triangular portion free move breeze Some film will behave has static chargeit will immediately flip over stick itself will pull loose easily sticky molecules NC have simply become aligned like magnets causes attraction Note repeatedly fold over such flap film will develop static charge especially wintertime Sticky film usually bunches up like accordion sticks tightly qualitative test film strength can performed small framesput half ping pong ball center film record much weight required rupture film Note such tests should compare like film colors surprised takes lot weight break film Film stabilityhow much will shrink should performed building model part such stabilizer covering Store covered stab box several months checking periodically warps extra tightness takes long time can prevent model warps film stable Tests sticky film vary very effective method build some small flat frames such model rudders cover lay together film sides touching rudders can separated easily film OK Remember several such tests quickly film will stick static charge other test often valid pin small frame film wall direct electric fan constant action air should loosen film frame becomes loose wrinkled Beware film quickly recovers gets smooth tight frame againit may unstable doesnt tighten completely probably will good use method also ages film quickly need use sooner otherwise should Happy flying Sources following suppliers specialists Indoor model supplies sell microfilm solutions various quantities Aerolite 36659 Ledgestone Mt Clemens MI 48043 Indoor Model Supply PO Box C Garberville CA 95440 Micro-X Products PO Box 1063-A Lorain OH 44055 SAFE FLYING IS NO ACCIDENT FF Duration/Meuser Continued page 65 Well see still business new ones join throngnext year about same time Engine-Uriy Schroeder Schroeder Roger 4111 W 98 St. Overland Park KS 66207 616 3334375 dy 1913 648-4265 cv Casting kits Windsong OT engine Morton M-5 prop OaR 136 Model Aviation EPOXY GLASS COWLS FOR NOSEN PICA Sb MORGAN BALSA USA PLAIT CONCEPT FLEEt HOSTETLER ACM T-CRAFT SHEBER P1775 ft SCALE SUPER CUB FOKKER 0-7 BOEING P- /2 P-2B F4B2 F4B4 SPARROW HA WE GEE BEE MOO Y MACBR/ENS TURBULENT CHRISTEN EAGLE BRIS/OHELLAS STAROUSTER II SCALE J3-BI BABY FLYBABY AIRCAMPER PILOT JUNGMANN 735 SCALE & OTHERS WHEEL PANTS FOR C/TA BR/A STAROUS TEA II P/iTS SKYBOL T LIBEATYSPORT CHRIS TEN EAGLE PBE HA WE STEARMAN STINSON SR-B MULLIGAN & OTHERS BRAZED & HEAT-TREATED WIRE GEARS&CABANES LARGE SCALE PLANS AVAILABLE DISCOUNT ON COWL WHEN PLANS ARE PURCHASED Send SASE tar latest list supply Modelers fiberglass parts plansWrite call us T & D FIBERGLASS SPECIALTIES 30525 SLOCK GARDEN CITY MI 48135 PHONE 313 421-6358
Edition: Model Aviation - 1981/06
Page Numbers: 61, 62, 63, 134, 135, 136
ne ultImaTe mcroriim-covered model huge600 sq area mike jobwas used Erv Rodemskystanding 1 974toran unsuccessful assault FAI Indoor World Record Rodemsky current Indoor World Champion plc kneeling L-R Jiri Kalina Karel Rybecky successful Indoor model flying need know properly make microfilm Indoor contributing editortakes mystery out highly important subject@ Bud Tenny IT HAS BEEN noted Indoor modeling hard just different other kinds model building has seemed difficult After Indoor modeling consists just three disciplines picking wood cutting wood moving slowly area Indoor building different almost incomprehensible microfilm-covered models high technology high performance end Indoor modeling remains real mystery build Easy B HLG Pennyplanes Peanut Scale make microfilm store cover etc whole area art just like other art simple things can improve success rest art remains doing often enough develop skill feel Microfilm covering Indoor models made pouring liquid water allowing thin film form film removed water some sort frame allowed age part drying process used cover Indoor model Put like seems like simple enough process rest simply technique art can learned Three basics absolutely necessary achieve simple process described above First must have microfilm solution pour water recommend Indoor beginner mix own solution unless has training chemistry dogged determination unlimited time about later some sources microfilm other Indoor specialty items listed end article second basic requirement making micro film sheet set strong frames can made balsa other wood Strong frames mean joints secure frame will hold its shape corners must remain square weight frame should make sag held face down horizontal position Square -in balsa wood can used frames up 6 7 wide up 18 long Square h-in stock minimum frames up 8 x 36 longer frames should heavier Unless plan use film fairly soon after has poured can arrange safe storage frames some other way June 1981 61 3 After suitable waiting period see text place frame carefully water make sure adheres film around Use officetype rubber cement frame make sticky should have box storage number frames short-term storage just pin frame wall unused room moving air room will help age film dust can gather Finally microfilm tank must constructed large flat box capable holding least 1 water several hours dimensions surface area very critical want make large sheets microfilm tank 3-ft wide 6-ft long very usable size should have least 1-ft clearance between edge largest frame edge tank common problems making microfilm surface area water tank too small microfilm tank should set up wellventilated area near drain tank can easily emptied basic tank need waterproofed buy large heavy-weight plastic drop-cloth just purpose use nothing else other uses should leave chemical traces plastic water can become contaminated hinder formation strong sheet film Similarly soap should notbe used plastic should protected mechanical damage Trying pour micro film tank has pinhole plastic like living time bomb keep 62 Model Aviation 1 plastic squeeze bottle smaii teflon rods graduated holes teflon make handy pouring spoutgives repeatable results 2 pouring spout poised foraction isyalved using little finger regulate flow Note arm relaxed spout very close water avoid splashing solution 4 Simultaneously siiue Trame TOrward lilt tront edge allow air under Continue moving forward lift Comes right off 5 left frame almost clear water Note forward movement must continue film stressed very much 6 right Drain water off film admire handiworkl film doesnt dry rapidly small pieces filmfrom previous poursstick film rinse water poured carefully down length film None difficult takes practice acquire technique wondering can finish pouring before leak gets big enough work through tank get floor Carefully dry plastic sheet after use fold loosely storage technique pouring microfilm also simple just need practice idea pour thin stream microfilm solution water getting liquid evenly distributed Dont start very edge tank dont pour such long stream solution spreading film has crowd outer edge tank Photo 1 shows handy pour spout greatly eases task uniform pouring top plastic squeeze bottle has cut away rest bottle spout has cut off until 3/16-in teflon rod tight fit end Anumberofdifferent pieces teflon cutoff drilled different size phnto shows interchangeable orifices used pouring spout made machinists drills between #30 #49 orifices stored simple rack keep sorted out use pour spout filled depth 1 orifice stoppered little finger Photo 2 shows spout held little finger covering orifice except film solution allowed flow reason pouring much film amount solution spout wont change appreciably empty solution Onto water hydraulic terms head liquid weight liquid above spout doesnt change very much rate flow doesnt change much either Now have pour spout will dispense uniform stream liquid other component smooth pour uniform sweeping motion over water Again refer Photo 2 note arm relaxed free move line across length tank Use water practice try get sweep across tank comfortable enough easy maintain uniform speed Practice starting flow unstopping orifice little finger stopping flow can repeatably start stop sweep about 8 10 end tank Lets discuss rest procedure Once sheet film has poured allow remain water few minutesthe exact time will differ somewhat different days different film solutions microfilm frame must made adhere film can pick up easiest way found brush coat rubber cement face frame will contact film water just before pouring film solvents will have evaporated cement before need frame Photo 3 shows frame being placed film lay flat film torn corner frame Once frame adheres film around check carefully push frame toward edge tank direction excess film bunches up Grab excess film tear loose frame Try avoid leaving tiny pieces film water might stick future sheets film Photo 4 shows start lifting sheet film rear frame has depressed slightly front edge raised slightly clear edge film water Push frame away you rotate frame upwards Photo 5 frame except back edge free water Photo 6 hoop held above water excess water drains off should noted some kinds microfilm drain absolutely clean clear very quickly others retain thin film water awhile latter kinds film some builders prefer use distilled water rinse film before dries completely Photo 7 shows film has drained rinsed ready store away Storage microfilm mentioned earlier Photo 8 shows box will store six frames film safety box constructed gluing bottom flaps together white furniture glue Next two -in square strips wood glued bottom box form rack strip several short segments tapered wood glued form V just wider thickness frame side box both ends similar Vs placedcarefully aligned bottom should noted size box determines length frame should about half inch clearance between frame box Once film has stopped dripping can stored box After pouring session box closed tightly put safe place Keep mind basic sequence discuss number fine tuning points First water temperature tank sometimes thought crijical water much warmer cooler room temperature will hard keep temperature have little trouble water between 750 850Fslightly cool touch water should poured about 15 minutes ahead first attempt pour film allow water temperature tank equalize probably will necessary mix hot cold water get desired temperature sure water temperature uniform have stored microfilm solution should vigorously shaken about hour before using bubbles generated can dissipate pouring film solution spout guard against generating bubbles will make thin spots pinholes poured sheet After pouring sheet allow excess film solution drain back container Rinse spout acetone another container discard rinse material after pouring session Some photos show layer newspaper beneath tank gives early warning pinholes leaks plastic paper shows leak immediately after fill tank make decision will allow puddles floor miserly am holes plastic can patched vinyl mending tape some plastic industrial contact cement Now comes hard partmicrofilm pouring has reputation being sometimes thing somewhat black art unjustified since film solution worked well last week may yield single sheet tonight After lot experimentation research have found several reasons such inconsistency assume no chemical contamination tank water some kinds city water heavily treated microfilm pouring difficult distilled water will fix problem approximately same room temperature have two major variables June1981 63 Continued page 134 7 lettl rinsed drained SHim ready tO store away safely untill ready use possible new film should aged several weeks before applying model 8 right cardboard box tight lid can converted microfilm storage box some pieces balsa support separate frames described text Following authors tips will enhance chances success REVOLUTIONARY NEW CHARGER C-50/4 MEN AUTOMATIC R/C SYSTEM CHARGER Extends life nicadi Extends capacity nicad Adds reliability nicads never before achieved charger Restores marginal batteries full power potential Batteries can left charge indefinitely damaging cells Fast chargesautomat ically Renders other chargers obsolete Now after i/o years development testing MEN Inc confidently intro duces its revolutionary C-50/4 Auto matic Pulse R/G System Charger unlike other charger have ever used DC charger pulsed charger therefore operates differently giving different resuha suitable control pulse height pulse rate charging batteries accomplished addition Out standing battery reliability produced charger several side benefits occur First batteries can left charger ipdefinitely simply means after flight session can put R/C system charge leave until youre ready fly again nest day next week next yearno need ever wonder about CL Speed/Hempel passage adapter conform downward flow pattern Engine get performance tuned pipe engine must set up properly Nick Sher tells done excellent article ModelAviation May 1979 Running pipe Start engine rich needle setting As turn needle valve leaner engine should come pipe engine will need fuel happens prepared immediately open needle valve about rn needle opened too far engine will fall off pipe happens just repeat process mentioned above get engine back pipe want gratefully acknowledge support have received Luther Roy project ideas criticisms encouragement have extremely valuable excellent machining ability can observed photos pipe adapter flaring tool sincerely hope time readers column make attempt build pipe will appreciate amount effort goes putting together such constructive article hope everyone enjoys article Tell em read Model Aviation Speed column next Speed column will tell modify Cox 049/051 cylinder rpm Gene Hempel 301 North Yale St Garland TX 75042 M icrofilm/Tenny Continued page 63 Relative humidity can affect microfilm pouring sessions much atmosphenc pressure serious about pouring microfilm simple barometer will enable record barometric pressure batch microfilm solution works well pressure different great amount surprised have different results pouring session general humidity can vary quite bit hindering formation good film humidity very high solvent evaporation film warm water can go fast film will cool enough condense moisture happens possible film will blush turn cloudy white Such film will very weak probably can lifted water Try much cooler water solvents will evaporate quickly wait longer before trying lift film 4PATTERN AND04,p 4 HIGH SPEED PROPELLERS oU DUYAIRSCREWft CUSTOM HIGH PERFORMANCE MAPLE PROPELLERS Propeller designed using symmetrical profile Individually precision hand balanced Accurale airfoil pitch Only high quality straight grain Eastern Maple used 8/ X 6% FORMULA 1 lOX 6 11X7 11X7/2 11X8 CUSTOM DESIGN UPON REQUEST SW PRODUCTS 5634 CRYSTAL COURT SANTA ROSA CA 95404 PRONE 707 526SARA Add 5100 P, SiS'O SAAIig charge long charge Just plug system leave till youre ready fly again Second battery tests can done charger example can test open battery cells shorted battery cells hi-leakage cells low ca pacity cells hi-impedance cells conditions can detected early lead disaster new MEN C-S0/4 charger available 3 models cover R/C needs 48 volts/g6 volts 48 volts/60 volts 48 volts/12 volts ca pable charging systems 240 MAH through 4 amps hour capscity new MEN C-S0/4 Charger rep resents latest ate art battery chargers No serious H/C en thusiast should Royal Electronics Sid Gates says appreciate friendship help will soon have RC systems chip want information write Jerry did show Cyclecharger d is- Bradshaw 3619 Hillcrest Lane Sacramento charges recharges battery packs 16-hr CA 95821 telephone number 916 487-9620 rate Also shown prototype Digitester still under development combines functions digital pulse-width meter digital voltmeter digital tach via option kitsitll also have outputs serve bench power supply battery charger servo cycler George hopes get hands describe regular Radio Tech nique column ANNOUNCING THE INTRODUCTION OF THE ALL NEW NELSON COMPETITION 15 ENGINE STANDARD AND R/C AVAILABLE JUNE 1 1981 complete formation send large stamped self-addressed envelope Kustom Kraftsmanship P0 Box 2699 Laguna Hills CA 92653 Dealer inquiries invited 134 Model Aviation microfilm solution known good some problems can anticipated allowed First sure can see least gold color film study film water Silver film very lightest no color visible have no reference point decide good silver film thin too weak lift some color can seen sure entire area covered frame will gold heavier sure frame attached film around Otherwise tearing excess film frame small tear may made inside frame area Unless film tough boot leather very likely tear point since lifting film puts large stress sheet Microfilm formed complex spreading process begins stream solution hits water After initial spreading sheet shrinks slightly before becoming stable During pouring action rapid spreading directions tries occur basic action forward direction pour side balance solvents solution wrong atmospheric pressure too low spreading will go too far weak silver film will produced Iry warmer water speed solvent evaporation pour film edge tank will help limit spreading last very touchy since just bit too much solution water will cause uneven thickness near edges extreme cases excess film will hinder spreading much liquid solution remains center very thick film will produced film can lifted safely breaks frame drying try waiting longer next time before lifting film likely film once spread still shrinking Attaching frame stopped shrinking finally film pulled itself apart hallmarks good microfilm supposed very color may true subtle variations color across sheet often almost impossible avoid abrupt color changes solution running too fast rate arm sweep large temperature changes water Pinholes thin spots indicate air bubbles solution splash hits water double line abrupt color changes line indicates faulty sheet will lift some reason solution separating during pour Try shaking solution wait bubbles disperse solution should totally free bubbles poured uniform sweep close water possible get plowing water go Finally separate panels film separated tiny cracks tells really bad pouring technique spoiled film solution some TIC R/C PRODUCTS Rt 1 Box 282 Prospect VA 23901 No other prop pulls biggie like DY NAT H RUST other gross deviation good practice Microfilm usually made nitrocellulose very much like nitrate clear dope chemical composition Two major differences dope intended shrink liquid microfilm must thin enough pour easily onto water Anyone plans mix own needs consider following items 1 Nitrocellulose NC produced variety speeds related fast standard metal sphere will drop through standard NC solution contained tube standard diameter rating measure long NC molecular chains microfilm made -second NC will make very weak film uneven color Five- six-second NC probably lower limit very long-chain NC will very strong have high tendency adhere itself 2 often almost impossible guarantee Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER P0KV RESINK&B SUPER P0KV RtSIN K&B SUPER P0KV PRIMER K&B SUPER POXY PAINT K&B MIXING CUPS Now experience full motor potential Dynathrusts 100% accurate pitch airfoil Costs less buy fly because its unequaled durability 15 6 pitch $ 700 18 6 8 pitch $1000 20 8 10 pitch $1400 Prices include UPS charges MC 0 VISA 0 COD 0 CHECK 0 MO 3TrRoINcJ 2541 NE 11th Court Pompano Beach Florida 33062 1-305-941-9119 Dealer Inquiries Invited grade NC used make given batch dope other nitrocellulose product base Therefore buy batch NC has dissolved specified mix solvents may work welL may able get another batch exactly same stuff batch microfilm can vary frustrating manner 3 Solvent balance has mentioned refers using mixture solvents its own rate evaporation example acetone very fast methyl ethyl ketone medium speed solvent amyl acetate slow blend solvents must right film spreads just right water evens itself out uniform thickness before stopping its spread quits shrinking reasonable time Determina tion proper solvent balance grade NC very time-consuming trial-and-error P0 Box 3957 Torrance CA 90510 June 1981 135 See dealer order direct Inuu urTormunu TOP PERFORMAi K&B ENGINES Airplane 4 Marine K&B FUtLS K&B GLOW PLUGS 7 Blends4 chnscen Fast realistic aerobatic kit features ABS wheelpants moulded canopy pre-bent wire Send $2500 plus $500 shipping RUBBER STRIP FAI RUBBER 4 out S flyoff 1979 World Championships used FAI RUBBER Made USA SIZES % 3/16 7/8 3/32 1/16 1mm 042 thick SPOOLED GROSS WT 1-ks 1-% LBS PRICE $1250 first spool PPD US Additional spools $1250 NEW PIRELLI SIZES 6mm 5mm 4mm X 1mm PRICE $1500 first hank PPD US Additional spools $1450 Sole US Distributor World-Wide Sales Send 25 cents 1980 Catalog Reach Stars 11th ANNUAL MODEL AERONAUTIC S SCHOLARSHIP CONTEST JULY 11& 12 1981 ATTENTION ERS process required solvent balance varies fairly rapidly different grades speeds NC different water temperatures different atmospheric pressures 4 Raw nitrocellulose film brittle will literally shatter under stress Therefore microfilm must contain substance known plasticizer enables film endure stress Too much plasticizer will make film sticky attract dust some plasticizers exude sheet very soon after pouring sheet gets both sticky brittle Selection plasticizer involves life-testing film sure nothing bad happens soit might take couple years design good mixthat cant duplicate because problems suppliers Have fun must mix own film solution use Over $3500 I Scholarships awarded plus trophies through 3rd Place 21 Scholarship Events An open contest will also held 12 events Main categories Free flight Control line Specialty events Rocketry Boeing Aerospace Company Kent Washington near Seattle detailed information application form write call Boeing Management Assoc PO Box 3707 Seattle WA 98124 L Attn Don Connell Org 2-3951 MS BK-61 206 773-1338 good techniques keep exacting records Record water temperature air temperature rela tive humidity atmospheric pressure Make several sizes film frames storage boxes match smallest frames can about 6 x 12 used take samples various tests would otherwise destroy large sheets Also particular batch does spread well has areas good color save small samples testing determine formula worth fooling sure make accurate measurements film ingredients mix various recipes use graduated chemistry beakers similar glassware mixing Pour NC first use solvents thoroughly rinse beaker Otherwise wont use NC mea sured Work toward standard amounts solution use calibrated eye-dropper glass add ingredients need small amount After mixing batch solution com pute amount ingredient percent record everything modify existing batch compute new percentages ingredient record both new formulation results trying pour new mix number simple tests can applied microfilm First cut corner film loose frameso triangular portion free move breeze Some film will behave has static chargeit will immediately flip over stick itself will pull loose easily sticky molecules NC have simply become aligned like magnets causes attraction Note repeatedly fold over such flap film will develop static charge especially wintertime Sticky film usually bunches up like accordion sticks tightly qualitative test film strength can performed small framesput half ping pong ball center film record much weight required rupture film Note such tests should compare like film colors surprised takes lot weight break film Film stabilityhow much will shrink should performed building model part such stabilizer covering Store covered stab box several months checking periodically warps extra tightness takes long time can prevent model warps film stable Tests sticky film vary very effective method build some small flat frames such model rudders cover lay together film sides touching rudders can separated easily film OK Remember several such tests quickly film will stick static charge other test often valid pin small frame film wall direct electric fan constant action air should loosen film frame becomes loose wrinkled Beware film quickly recovers gets smooth tight frame againit may unstable doesnt tighten completely probably will good use method also ages film quickly need use sooner otherwise should Happy flying Sources following suppliers specialists Indoor model supplies sell microfilm solutions various quantities Aerolite 36659 Ledgestone Mt Clemens MI 48043 Indoor Model Supply PO Box C Garberville CA 95440 Micro-X Products PO Box 1063-A Lorain OH 44055 SAFE FLYING IS NO ACCIDENT FF Duration/Meuser Continued page 65 Well see still business new ones join throngnext year about same time Engine-Uriy Schroeder Schroeder Roger 4111 W 98 St. Overland Park KS 66207 616 3334375 dy 1913 648-4265 cv Casting kits Windsong OT engine Morton M-5 prop OaR 136 Model Aviation EPOXY GLASS COWLS FOR NOSEN PICA Sb MORGAN BALSA USA PLAIT CONCEPT FLEEt HOSTETLER ACM T-CRAFT SHEBER P1775 ft SCALE SUPER CUB FOKKER 0-7 BOEING P- /2 P-2B F4B2 F4B4 SPARROW HA WE GEE BEE MOO Y MACBR/ENS TURBULENT CHRISTEN EAGLE BRIS/OHELLAS STAROUSTER II SCALE J3-BI BABY FLYBABY AIRCAMPER PILOT JUNGMANN 735 SCALE & OTHERS WHEEL PANTS FOR C/TA BR/A STAROUS TEA II P/iTS SKYBOL T LIBEATYSPORT CHRIS TEN EAGLE PBE HA WE STEARMAN STINSON SR-B MULLIGAN & OTHERS BRAZED & HEAT-TREATED WIRE GEARS&CABANES LARGE SCALE PLANS AVAILABLE DISCOUNT ON COWL WHEN PLANS ARE PURCHASED Send SASE tar latest list supply Modelers fiberglass parts plansWrite call us T & D FIBERGLASS SPECIALTIES 30525 SLOCK GARDEN CITY MI 48135 PHONE 313 421-6358
Edition: Model Aviation - 1981/06
Page Numbers: 61, 62, 63, 134, 135, 136
ne ultImaTe mcroriim-covered model huge600 sq area mike jobwas used Erv Rodemskystanding 1 974toran unsuccessful assault FAI Indoor World Record Rodemsky current Indoor World Champion plc kneeling L-R Jiri Kalina Karel Rybecky successful Indoor model flying need know properly make microfilm Indoor contributing editortakes mystery out highly important subject@ Bud Tenny IT HAS BEEN noted Indoor modeling hard just different other kinds model building has seemed difficult After Indoor modeling consists just three disciplines picking wood cutting wood moving slowly area Indoor building different almost incomprehensible microfilm-covered models high technology high performance end Indoor modeling remains real mystery build Easy B HLG Pennyplanes Peanut Scale make microfilm store cover etc whole area art just like other art simple things can improve success rest art remains doing often enough develop skill feel Microfilm covering Indoor models made pouring liquid water allowing thin film form film removed water some sort frame allowed age part drying process used cover Indoor model Put like seems like simple enough process rest simply technique art can learned Three basics absolutely necessary achieve simple process described above First must have microfilm solution pour water recommend Indoor beginner mix own solution unless has training chemistry dogged determination unlimited time about later some sources microfilm other Indoor specialty items listed end article second basic requirement making micro film sheet set strong frames can made balsa other wood Strong frames mean joints secure frame will hold its shape corners must remain square weight frame should make sag held face down horizontal position Square -in balsa wood can used frames up 6 7 wide up 18 long Square h-in stock minimum frames up 8 x 36 longer frames should heavier Unless plan use film fairly soon after has poured can arrange safe storage frames some other way June 1981 61 3 After suitable waiting period see text place frame carefully water make sure adheres film around Use officetype rubber cement frame make sticky should have box storage number frames short-term storage just pin frame wall unused room moving air room will help age film dust can gather Finally microfilm tank must constructed large flat box capable holding least 1 water several hours dimensions surface area very critical want make large sheets microfilm tank 3-ft wide 6-ft long very usable size should have least 1-ft clearance between edge largest frame edge tank common problems making microfilm surface area water tank too small microfilm tank should set up wellventilated area near drain tank can easily emptied basic tank need waterproofed buy large heavy-weight plastic drop-cloth just purpose use nothing else other uses should leave chemical traces plastic water can become contaminated hinder formation strong sheet film Similarly soap should notbe used plastic should protected mechanical damage Trying pour micro film tank has pinhole plastic like living time bomb keep 62 Model Aviation 1 plastic squeeze bottle smaii teflon rods graduated holes teflon make handy pouring spoutgives repeatable results 2 pouring spout poised foraction isyalved using little finger regulate flow Note arm relaxed spout very close water avoid splashing solution 4 Simultaneously siiue Trame TOrward lilt tront edge allow air under Continue moving forward lift Comes right off 5 left frame almost clear water Note forward movement must continue film stressed very much 6 right Drain water off film admire handiworkl film doesnt dry rapidly small pieces filmfrom previous poursstick film rinse water poured carefully down length film None difficult takes practice acquire technique wondering can finish pouring before leak gets big enough work through tank get floor Carefully dry plastic sheet after use fold loosely storage technique pouring microfilm also simple just need practice idea pour thin stream microfilm solution water getting liquid evenly distributed Dont start very edge tank dont pour such long stream solution spreading film has crowd outer edge tank Photo 1 shows handy pour spout greatly eases task uniform pouring top plastic squeeze bottle has cut away rest bottle spout has cut off until 3/16-in teflon rod tight fit end Anumberofdifferent pieces teflon cutoff drilled different size phnto shows interchangeable orifices used pouring spout made machinists drills between #30 #49 orifices stored simple rack keep sorted out use pour spout filled depth 1 orifice stoppered little finger Photo 2 shows spout held little finger covering orifice except film solution allowed flow reason pouring much film amount solution spout wont change appreciably empty solution Onto water hydraulic terms head liquid weight liquid above spout doesnt change very much rate flow doesnt change much either Now have pour spout will dispense uniform stream liquid other component smooth pour uniform sweeping motion over water Again refer Photo 2 note arm relaxed free move line across length tank Use water practice try get sweep across tank comfortable enough easy maintain uniform speed Practice starting flow unstopping orifice little finger stopping flow can repeatably start stop sweep about 8 10 end tank Lets discuss rest procedure Once sheet film has poured allow remain water few minutesthe exact time will differ somewhat different days different film solutions microfilm frame must made adhere film can pick up easiest way found brush coat rubber cement face frame will contact film water just before pouring film solvents will have evaporated cement before need frame Photo 3 shows frame being placed film lay flat film torn corner frame Once frame adheres film around check carefully push frame toward edge tank direction excess film bunches up Grab excess film tear loose frame Try avoid leaving tiny pieces film water might stick future sheets film Photo 4 shows start lifting sheet film rear frame has depressed slightly front edge raised slightly clear edge film water Push frame away you rotate frame upwards Photo 5 frame except back edge free water Photo 6 hoop held above water excess water drains off should noted some kinds microfilm drain absolutely clean clear very quickly others retain thin film water awhile latter kinds film some builders prefer use distilled water rinse film before dries completely Photo 7 shows film has drained rinsed ready store away Storage microfilm mentioned earlier Photo 8 shows box will store six frames film safety box constructed gluing bottom flaps together white furniture glue Next two -in square strips wood glued bottom box form rack strip several short segments tapered wood glued form V just wider thickness frame side box both ends similar Vs placedcarefully aligned bottom should noted size box determines length frame should about half inch clearance between frame box Once film has stopped dripping can stored box After pouring session box closed tightly put safe place Keep mind basic sequence discuss number fine tuning points First water temperature tank sometimes thought crijical water much warmer cooler room temperature will hard keep temperature have little trouble water between 750 850Fslightly cool touch water should poured about 15 minutes ahead first attempt pour film allow water temperature tank equalize probably will necessary mix hot cold water get desired temperature sure water temperature uniform have stored microfilm solution should vigorously shaken about hour before using bubbles generated can dissipate pouring film solution spout guard against generating bubbles will make thin spots pinholes poured sheet After pouring sheet allow excess film solution drain back container Rinse spout acetone another container discard rinse material after pouring session Some photos show layer newspaper beneath tank gives early warning pinholes leaks plastic paper shows leak immediately after fill tank make decision will allow puddles floor miserly am holes plastic can patched vinyl mending tape some plastic industrial contact cement Now comes hard partmicrofilm pouring has reputation being sometimes thing somewhat black art unjustified since film solution worked well last week may yield single sheet tonight After lot experimentation research have found several reasons such inconsistency assume no chemical contamination tank water some kinds city water heavily treated microfilm pouring difficult distilled water will fix problem approximately same room temperature have two major variables June1981 63 Continued page 134 7 lettl rinsed drained SHim ready tO store away safely untill ready use possible new film should aged several weeks before applying model 8 right cardboard box tight lid can converted microfilm storage box some pieces balsa support separate frames described text Following authors tips will enhance chances success REVOLUTIONARY NEW CHARGER C-50/4 MEN AUTOMATIC R/C SYSTEM CHARGER Extends life nicadi Extends capacity nicad Adds reliability nicads never before achieved charger Restores marginal batteries full power potential Batteries can left charge indefinitely damaging cells Fast chargesautomat ically Renders other chargers obsolete Now after i/o years development testing MEN Inc confidently intro duces its revolutionary C-50/4 Auto matic Pulse R/G System Charger unlike other charger have ever used DC charger pulsed charger therefore operates differently giving different resuha suitable control pulse height pulse rate charging batteries accomplished addition Out standing battery reliability produced charger several side benefits occur First batteries can left charger ipdefinitely simply means after flight session can put R/C system charge leave until youre ready fly again nest day next week next yearno need ever wonder about CL Speed/Hempel passage adapter conform downward flow pattern Engine get performance tuned pipe engine must set up properly Nick Sher tells done excellent article ModelAviation May 1979 Running pipe Start engine rich needle setting As turn needle valve leaner engine should come pipe engine will need fuel happens prepared immediately open needle valve about rn needle opened too far engine will fall off pipe happens just repeat process mentioned above get engine back pipe want gratefully acknowledge support have received Luther Roy project ideas criticisms encouragement have extremely valuable excellent machining ability can observed photos pipe adapter flaring tool sincerely hope time readers column make attempt build pipe will appreciate amount effort goes putting together such constructive article hope everyone enjoys article Tell em read Model Aviation Speed column next Speed column will tell modify Cox 049/051 cylinder rpm Gene Hempel 301 North Yale St Garland TX 75042 M icrofilm/Tenny Continued page 63 Relative humidity can affect microfilm pouring sessions much atmosphenc pressure serious about pouring microfilm simple barometer will enable record barometric pressure batch microfilm solution works well pressure different great amount surprised have different results pouring session general humidity can vary quite bit hindering formation good film humidity very high solvent evaporation film warm water can go fast film will cool enough condense moisture happens possible film will blush turn cloudy white Such film will very weak probably can lifted water Try much cooler water solvents will evaporate quickly wait longer before trying lift film 4PATTERN AND04,p 4 HIGH SPEED PROPELLERS oU DUYAIRSCREWft CUSTOM HIGH PERFORMANCE MAPLE PROPELLERS Propeller designed using symmetrical profile Individually precision hand balanced Accurale airfoil pitch Only high quality straight grain Eastern Maple used 8/ X 6% FORMULA 1 lOX 6 11X7 11X7/2 11X8 CUSTOM DESIGN UPON REQUEST SW PRODUCTS 5634 CRYSTAL COURT SANTA ROSA CA 95404 PRONE 707 526SARA Add 5100 P, SiS'O SAAIig charge long charge Just plug system leave till youre ready fly again Second battery tests can done charger example can test open battery cells shorted battery cells hi-leakage cells low ca pacity cells hi-impedance cells conditions can detected early lead disaster new MEN C-S0/4 charger available 3 models cover R/C needs 48 volts/g6 volts 48 volts/60 volts 48 volts/12 volts ca pable charging systems 240 MAH through 4 amps hour capscity new MEN C-S0/4 Charger rep resents latest ate art battery chargers No serious H/C en thusiast should Royal Electronics Sid Gates says appreciate friendship help will soon have RC systems chip want information write Jerry did show Cyclecharger d is- Bradshaw 3619 Hillcrest Lane Sacramento charges recharges battery packs 16-hr CA 95821 telephone number 916 487-9620 rate Also shown prototype Digitester still under development combines functions digital pulse-width meter digital voltmeter digital tach via option kitsitll also have outputs serve bench power supply battery charger servo cycler George hopes get hands describe regular Radio Tech nique column ANNOUNCING THE INTRODUCTION OF THE ALL NEW NELSON COMPETITION 15 ENGINE STANDARD AND R/C AVAILABLE JUNE 1 1981 complete formation send large stamped self-addressed envelope Kustom Kraftsmanship P0 Box 2699 Laguna Hills CA 92653 Dealer inquiries invited 134 Model Aviation microfilm solution known good some problems can anticipated allowed First sure can see least gold color film study film water Silver film very lightest no color visible have no reference point decide good silver film thin too weak lift some color can seen sure entire area covered frame will gold heavier sure frame attached film around Otherwise tearing excess film frame small tear may made inside frame area Unless film tough boot leather very likely tear point since lifting film puts large stress sheet Microfilm formed complex spreading process begins stream solution hits water After initial spreading sheet shrinks slightly before becoming stable During pouring action rapid spreading directions tries occur basic action forward direction pour side balance solvents solution wrong atmospheric pressure too low spreading will go too far weak silver film will produced Iry warmer water speed solvent evaporation pour film edge tank will help limit spreading last very touchy since just bit too much solution water will cause uneven thickness near edges extreme cases excess film will hinder spreading much liquid solution remains center very thick film will produced film can lifted safely breaks frame drying try waiting longer next time before lifting film likely film once spread still shrinking Attaching frame stopped shrinking finally film pulled itself apart hallmarks good microfilm supposed very color may true subtle variations color across sheet often almost impossible avoid abrupt color changes solution running too fast rate arm sweep large temperature changes water Pinholes thin spots indicate air bubbles solution splash hits water double line abrupt color changes line indicates faulty sheet will lift some reason solution separating during pour Try shaking solution wait bubbles disperse solution should totally free bubbles poured uniform sweep close water possible get plowing water go Finally separate panels film separated tiny cracks tells really bad pouring technique spoiled film solution some TIC R/C PRODUCTS Rt 1 Box 282 Prospect VA 23901 No other prop pulls biggie like DY NAT H RUST other gross deviation good practice Microfilm usually made nitrocellulose very much like nitrate clear dope chemical composition Two major differences dope intended shrink liquid microfilm must thin enough pour easily onto water Anyone plans mix own needs consider following items 1 Nitrocellulose NC produced variety speeds related fast standard metal sphere will drop through standard NC solution contained tube standard diameter rating measure long NC molecular chains microfilm made -second NC will make very weak film uneven color Five- six-second NC probably lower limit very long-chain NC will very strong have high tendency adhere itself 2 often almost impossible guarantee Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER P0KV RESINK&B SUPER P0KV RtSIN K&B SUPER P0KV PRIMER K&B SUPER POXY PAINT K&B MIXING CUPS Now experience full motor potential Dynathrusts 100% accurate pitch airfoil Costs less buy fly because its unequaled durability 15 6 pitch $ 700 18 6 8 pitch $1000 20 8 10 pitch $1400 Prices include UPS charges MC 0 VISA 0 COD 0 CHECK 0 MO 3TrRoINcJ 2541 NE 11th Court Pompano Beach Florida 33062 1-305-941-9119 Dealer Inquiries Invited grade NC used make given batch dope other nitrocellulose product base Therefore buy batch NC has dissolved specified mix solvents may work welL may able get another batch exactly same stuff batch microfilm can vary frustrating manner 3 Solvent balance has mentioned refers using mixture solvents its own rate evaporation example acetone very fast methyl ethyl ketone medium speed solvent amyl acetate slow blend solvents must right film spreads just right water evens itself out uniform thickness before stopping its spread quits shrinking reasonable time Determina tion proper solvent balance grade NC very time-consuming trial-and-error P0 Box 3957 Torrance CA 90510 June 1981 135 See dealer order direct Inuu urTormunu TOP PERFORMAi K&B ENGINES Airplane 4 Marine K&B FUtLS K&B GLOW PLUGS 7 Blends4 chnscen Fast realistic aerobatic kit features ABS wheelpants moulded canopy pre-bent wire Send $2500 plus $500 shipping RUBBER STRIP FAI RUBBER 4 out S flyoff 1979 World Championships used FAI RUBBER Made USA SIZES % 3/16 7/8 3/32 1/16 1mm 042 thick SPOOLED GROSS WT 1-ks 1-% LBS PRICE $1250 first spool PPD US Additional spools $1250 NEW PIRELLI SIZES 6mm 5mm 4mm X 1mm PRICE $1500 first hank PPD US Additional spools $1450 Sole US Distributor World-Wide Sales Send 25 cents 1980 Catalog Reach Stars 11th ANNUAL MODEL AERONAUTIC S SCHOLARSHIP CONTEST JULY 11& 12 1981 ATTENTION ERS process required solvent balance varies fairly rapidly different grades speeds NC different water temperatures different atmospheric pressures 4 Raw nitrocellulose film brittle will literally shatter under stress Therefore microfilm must contain substance known plasticizer enables film endure stress Too much plasticizer will make film sticky attract dust some plasticizers exude sheet very soon after pouring sheet gets both sticky brittle Selection plasticizer involves life-testing film sure nothing bad happens soit might take couple years design good mixthat cant duplicate because problems suppliers Have fun must mix own film solution use Over $3500 I Scholarships awarded plus trophies through 3rd Place 21 Scholarship Events An open contest will also held 12 events Main categories Free flight Control line Specialty events Rocketry Boeing Aerospace Company Kent Washington near Seattle detailed information application form write call Boeing Management Assoc PO Box 3707 Seattle WA 98124 L Attn Don Connell Org 2-3951 MS BK-61 206 773-1338 good techniques keep exacting records Record water temperature air temperature rela tive humidity atmospheric pressure Make several sizes film frames storage boxes match smallest frames can about 6 x 12 used take samples various tests would otherwise destroy large sheets Also particular batch does spread well has areas good color save small samples testing determine formula worth fooling sure make accurate measurements film ingredients mix various recipes use graduated chemistry beakers similar glassware mixing Pour NC first use solvents thoroughly rinse beaker Otherwise wont use NC mea sured Work toward standard amounts solution use calibrated eye-dropper glass add ingredients need small amount After mixing batch solution com pute amount ingredient percent record everything modify existing batch compute new percentages ingredient record both new formulation results trying pour new mix number simple tests can applied microfilm First cut corner film loose frameso triangular portion free move breeze Some film will behave has static chargeit will immediately flip over stick itself will pull loose easily sticky molecules NC have simply become aligned like magnets causes attraction Note repeatedly fold over such flap film will develop static charge especially wintertime Sticky film usually bunches up like accordion sticks tightly qualitative test film strength can performed small framesput half ping pong ball center film record much weight required rupture film Note such tests should compare like film colors surprised takes lot weight break film Film stabilityhow much will shrink should performed building model part such stabilizer covering Store covered stab box several months checking periodically warps extra tightness takes long time can prevent model warps film stable Tests sticky film vary very effective method build some small flat frames such model rudders cover lay together film sides touching rudders can separated easily film OK Remember several such tests quickly film will stick static charge other test often valid pin small frame film wall direct electric fan constant action air should loosen film frame becomes loose wrinkled Beware film quickly recovers gets smooth tight frame againit may unstable doesnt tighten completely probably will good use method also ages film quickly need use sooner otherwise should Happy flying Sources following suppliers specialists Indoor model supplies sell microfilm solutions various quantities Aerolite 36659 Ledgestone Mt Clemens MI 48043 Indoor Model Supply PO Box C Garberville CA 95440 Micro-X Products PO Box 1063-A Lorain OH 44055 SAFE FLYING IS NO ACCIDENT FF Duration/Meuser Continued page 65 Well see still business new ones join throngnext year about same time Engine-Uriy Schroeder Schroeder Roger 4111 W 98 St. Overland Park KS 66207 616 3334375 dy 1913 648-4265 cv Casting kits Windsong OT engine Morton M-5 prop OaR 136 Model Aviation EPOXY GLASS COWLS FOR NOSEN PICA Sb MORGAN BALSA USA PLAIT CONCEPT FLEEt HOSTETLER ACM T-CRAFT SHEBER P1775 ft SCALE SUPER CUB FOKKER 0-7 BOEING P- /2 P-2B F4B2 F4B4 SPARROW HA WE GEE BEE MOO Y MACBR/ENS TURBULENT CHRISTEN EAGLE BRIS/OHELLAS STAROUSTER II SCALE J3-BI BABY FLYBABY AIRCAMPER PILOT JUNGMANN 735 SCALE & OTHERS WHEEL PANTS FOR C/TA BR/A STAROUS TEA II P/iTS SKYBOL T LIBEATYSPORT CHRIS TEN EAGLE PBE HA WE STEARMAN STINSON SR-B MULLIGAN & OTHERS BRAZED & HEAT-TREATED WIRE GEARS&CABANES LARGE SCALE PLANS AVAILABLE DISCOUNT ON COWL WHEN PLANS ARE PURCHASED Send SASE tar latest list supply Modelers fiberglass parts plansWrite call us T & D FIBERGLASS SPECIALTIES 30525 SLOCK GARDEN CITY MI 48135 PHONE 313 421-6358