IT WAS CASE lunchtime hying squeeze As company work has ex panded lunchtime flying field has shrinking around writing di mensions field approximately 150 yards square down nearly 400 yards square tremendous loss area already prompted elimination RC aircraft over 20 cu knew something needed done efficiently safely utilize what left field have al ways liked idea flying Gliders lunchtime Theyre clean require less field support equipment no big heavy field box did some research small Hand-Launched RC Glider kits cur rently available didnt find anything really grabbed aesthetically short jump decision de sign own Consortium began take shape decided design requirements built one-piece wing aircraft fit easily small Toyota liftback made plug-in wings would have strong enough take standard high-start tow load fuselage look sexyno slab sides Strong Top Consortium flight what looks promising inermai weather 15-meter Sail plane looks flies much like larger counterparts Above author launching M-45 airfoil-equipped version Vermont Mountain Retreat small high-start launched Glider high enough go thermal hunting over thickly wooded slope background April 1990 93 Ron Farkas launching Eppler 201 airfoilThis Consortium built authors friend Ron Farkas Its equipped Epplerequipped Glider high-start struc 201 airfoIl giving thinner wing making slightly heavier about three ounces thantures background give some idea authors prototype thin-winged version flies just well considerably fasterthe limited size lunchtime flying field 3 1 Consortium flying past expanded office building complex spawned idea developina small multifunction Glider may tight squeeze fits Ron Farkas Glider seen its 225-mAh battery pack standard Futaba servos hidden under wing rather large Futaba rkrn kIte stiffeners around Fuselage cutout upside-down canopy Lonsortlum crew right left Bob Aberle Ron Farkas Howie Applegate Tom Hunt Hank Stumpf Nick Dannendorfer Other Consortium builders pi include Paul Bell George Myers Scott Conover Bob Roth Jr Phil John Kicisler Ron Zulow Phil Kielsier recently finished flew Clark V-equipped Consortium its understood RAF 32 Eppler 193 airfoil-equipped versions would soon flying 94 Model Aviation T-tail looks performance out harms way launching landing Rudder/elevator control keep sim ple variants include coupled ai leron rudder Finally aircraft should have lightweight structure good performance design emerged 60-in-span built-up constant-chord polyhedral wing Wing area 345 sq Building shapely non-slab-sided fuselage out balsa would have added too much weight fiberglass construction chosen later Control provided constant-chord stabilator top molded-in fin/fuse lage adjoining rudder Though may seem rather bulbous some tastes fuselage proportioned permit use standard-size radio gear use 225or 100-mAh receiver pack total weight may little what youd get mis stage heavy 6-az cloth draped over nose section uru oca 1fle trailing edge forward nose Apply resin nerously Right photo 2-oz cloth has applied wing trailing edge point aft fin plus some forward overlap systems offer just miniservos standard-size receiver Total weight odel should between 14 20 ounces Something told project ing popular fellow ers Sure enough no sooner showed ound some first draft plans men ned fuselage would fiberglass dreaded words isiness heard want So offered produce fuselages ub members no cost expected return told airplane built just collect dust base ent also expected posed photographs builders models near pressmefinished Thoughts lunchtime Precision Dura contests soon followed builder iould vary basic design choos g own airfoil could irfoils shown plans another wn choice Construction uselage Fiberglass construction tends care lot people away especially must done scratch case scratch means creating master out some easily workable material bass wood foam Prepare master release agent Position jig half ex posed begin heavy glass layup exposed surface produce female mold half fuselage Allow first half cure flip over master re peat process other half Use medium-weight glass lay up fuse lage molds Join two halves theyre still wet molds After final curing sepa rate molds sand edges newly formed fuselage Whew Youve fi nally got something can attach wings tail Its lot work fuselage unless Consortium will also club venture Keep mind smoother accurate master better mold However theres easierand equally sat isfyingway creating light strong fi berglass parts mold needs done create shape part soft wood pine fine basswood bet ter Carve shape wood using tem plates guide isnt necessary repli cate exact contour just sure part looks symmetrical shape satis factory seal wood sanding seal er Drill /8-in hole nose other tail support part jig Any type crude jig built house hold lumber pile fine see photos Cover entire mold fiberglass re lease agent available auto supply stores marinas Cut out oversized piece 2-oz glass cloth K&B medium approximately shape fuselage Drape cloth over left-hand side fuselage gently coax hand shape fuselage Mark fiberglass felt-tip marker about /4 % farther around onto right-hand side fuselage continuing way around profile Remove glass cut along line just fin ished marking Put piece glass onto some stiff cardboard transfer shape Cut out cardboard duplicate now pattern producing glass lay ers After much experimentation strongest lightest fuselage obtained cut ting out two left right sides layApril 1990 95 second layer 2-oz cloth draped over entire fuselage underlying layers still wet still wet resin rked second layer Right cured fuselage plug still inside has carefully wet sanded until its perfectly smooth ers entire profile K&B mediumweight cloth approximately 2 oz cloth becomes outside layer make inside nose layer cut out two profiles approximately trailing edge wing forward using K&B heavy cloth ap proximately 6 oz Cut two profiles K&B medium cloth trailing edge wing aft fin allowing some forward overlap inside layer tail boom fin Begin laying up heavier nose layer Dont worry doesnt conform tight nose radiuswell fix later pine nose block Continue wet layup medium-weight glass cloth aft wing position sections secure drape full-length piece over first layers dab dry brush against glass bring resin surface wetting outside layer thoroughly Try get outside layer thoroughly wet using ad ditional resin cup since will have sanded off later Allow resin cure thoroughly remove glass-wrapped plug fixture Take slop sink basement dont have slop sink dont have basement call self modeler start wet sanding fuselage its still plug Continue sanding until youre happy finish Dont prime fuselage sandable primer unless want sand off tween coats primer does highlight holes lumps very well its also very heavy Once finish acceptable apply three four layers masking tape along entire bottom centerline fuselage length Remove reusable plug cutting through fuselage along maskingtape guideline fine-toothed X-Acto saw Dont worry about scratching up plug sawing Its outside fi berglass outside plug needs smooth nice finish After 13 fuselages plug looks like heck still produces nice parts Once have sawn through entire bottom glass fuselage begin prying off plug plug properly waxed will separate easily glass should able quickly extract plug 96 Model Aviation through bottom fuselage min imal effort now have choice make must rejoin lower fuselage /2-in strip cloth resin can outside sanding smooth after curing can proceed lay out cut off canopy rejoin lower fuselage inside Believe doing inside isnt easy Reaching down long narrow tail boom place cloth resin difficult though its cer tainly possible experienced glass work Glue fin tail post once canopy has cut off Let say few words about compat ibility glues fiberglass used polyester resin lay up fuselage must use glue well Five-minute ep oxy wont stick well polyester no matter clean roughed up surface ever used epoxy resin laminate standard epoxy glue may used sure though clean mating surfaces thoroughly alcohol thinner rough up glass bit use CyA cyanoacrylate glues Continued page 101 Left This photo shows bottom seam Carefully apply five six layers masking tape along side seam act guide X-Acto saw seen photo right Right saw used split entire bottom fuselage open sort like gutting fish Left After complete incision has made fuselage plug may extracted glass fuselage pulling fin seen photo Right fuselage plug bottom completely removed new glass fuselage plug can used over over again Left area cutting out canopy masked off Note hole fuselage just aft canopy 3A-in steel wing rod Right canopy has cut out using X-Acto saw photo Stiffeners must now installed canopy fuselage bonding anything fiberglass Although bond feels strong tension glue cannot take shearing forces produced fuselage flexes encounters sudden impact hard landing RTV silicon glues make good alterna tive regardless type resin used overnight cure types such Dow Cornings 3145 high-strength/high-tempera ture silicon glue/sealant work best can found good electrical supply house Again no matter what glue use absolutely certain release agent has removed mating surfaces inside fuselage Sand down fiberglass nose un til clean cross section obtained Cut small block pine approximate shape nose glue fuse lage Sand shape making sure nose radius too sharp Cut out glue canopy area stiffen ers %-in balsa A1 ply doublers fuselage cut out glue stiffeners canopy itself Glue %2 ply inner liner side inside wall fin halves assuring %2-in gap between two liners %2 ply blade glued stabilator will slide pivot Install two Sullivan light cables sheaths aft fuselage time point another decision must made want one-piece airplane plug-in wings one-piece wing mark fuselage conform chosen airfoil cut away necessary fiberglass Set fuse lage aside until final assembly plug-in wings position firmly ep oxy 3/6-OD brass aluminum wing rod place set fuselage aside until final assembly Wings Basic top bottom spar construc tion used save weight upper leading edge sheeted Choose airfoils shown plan cut 26 iden tical ribs Construct outer panels first building right over plan per standard proce dure Pin ribs place add leading trailing edge stock install top spar Add leading edge sheeting re move wing plan install lower spar Though dont think shear webs nec essary outer panel conservative types may want add now stall wing tip blocks sand shape inner panel built much same way few exceptions out board rib must canted match out board section correct dihedral angle first three ribs must notched ac cept one-piece wing dihedral spar subspar tube mount plug-in wings youre building one-piece wing glue one-piece spar inboard pan nels Join two inboard halves checking dihedral correct Fill space beApril 1990 101 side view shows fiberglass f builtup rudder airfoiled stabilator Note early smaller version rud der proved inefficient larger efficient rudder shown plans horizontal tail sitting atop fiberglass fin stabilator can built flat airfoil author believes Glider performs better airfoiled configuration An end view down-turned carved Hoerner wing tip blocks Hoerner wing tip designed minimize air flow turbulence across end wing enhancing efficiency Continued page 102 downward turning wing tip seen trailing edge shot outer left wing pan el Note no shear webbing outer panel can however added makes comfortable Bear mind extra strength translates extra weight CONSORTIUM TOM HUNT 60 HAND LAUNCHED/SMAIF HIGH SA SAILPLANE IDHT 4 - 20 OZALL FLYINT IFABILYZEP wIND AREA 345 5015 /B PLYWOOD TAK PIVOT SUPPORT FLALNEI BRASS TUBE ROD AIFATNY TO IF OR STAB Il-IF INSIDE LIFICAL WITH -e BRASS KBE RYDER RAZOR SAW CANOPY EPON FYSIFACE/0-SI INBO PANFY ONLY RIFT GRADE PUOCERTEIF VA TOE SERVOS /32 PREP SYT REMOVED FROM iLlS SIDE FUR CLARIFY YB BALSA- /04 CANOPY STTFFENRT I/B 1 4 SPREE SPARS PPER YIF LOWER / A RIBS tween wings solid block soft balsa sand airfoil shape youre building two-piece plug-in wing glue A-in Lite Ply tube mount subspar both inboard sections point brass wing tube must installed Clear root rib tube will rest just under bottom top spar second rib should cleared middle third rib cleared just above top bottom spar will achieve maxi mum dihedral angle possible whatever airfoil have chosen Insert tube epoxy liberally A-in Lite Ply tube mount joining upper lower spars Add wing root filler block Sand block airfoil shape carve fit fuselage upon assembly Add 1/6-dia pin leading trailing edge secure incidence angle plugged fuselage Join inboard sections outboard panels using A-in Lite Ply dihe dral brace spar trailing edge Horizontal tail favor slab tails ease construction ignore airfoil shape shown plan believe airfoiled tails make better con trol proceed following steps Build tail building 3R-in-thick slab tail right over plan tail dry cut out two plywood templates airfoil shape tack glue onto tip caps Sand tail using long sanding block 120-grit paper thing rougher may snap ribs Cut out slot horizontal tail center line accept %2 ply blade pivot Drill A-in-dia hole Y32 ply pivot insert A-in-ID brass tube hole sand flush blade Cover tail blade favorite heat shrink ma terial Rudder Like horizontal tail rudder can probably built out scrap box Build slab sided over plan glue dry remove rudder plan sand wedge shape Bevel leading edge side onlya minimum 300 produces proper deflec tion installed one-sided bevel al lows surface hinge rudder tape trim MonoKote side fin giving effective rudder control Assembly Drill hole fin throug] glass cloth %2 ply liners th horizontal tail pivot Insert A-in-ID brass tube gluing securely Remove th section tube slot created tw /32 ply liners Insert horizontal tail bladi slot line up holes Place %2-dia brass pin pivot holes t check alignment freedom move ment Lightly sand away part binds making one-piece-wing version sert wing through opening fu selage checking alignment mci dence Sand fuselage necessary en sure good fit straightness Workinj through canopy opening glue winj fuselage using five-minute epox mixed microballoons plug-in version needs t done carve out inboard fille block fits fuselage snugly youre much carver isnt neces sary achieve exact fit just get Continued page 10 102 Model Aviation /025FY IF p e possible Wax outside fuselage area airfoil Apply mixture ep oxy microballoons roughly carved block Insert wing onto wing rod push against waxed fuselage epoxy thoroughly dry remove wing sand off excess epoxy slurry Install radio gear using positions shown plan guide cable tachment leading edge stabila tor can simple small piece brass tubing squashed flat soldered end cable Drill hole size small nail brad through flattened brass tube Insert nail through tube leading edge block tail Should hole balsa tail become sloppy simply remove nail wet hole thin CyA glue will close hole slightly regain tight fit After epoxying /6 wire tow hook place youre ready paint fuselage minimize weightremember paint heavyuse light primer coat choose dark color will cover two coats Assemble rudder fin using method described earlier Balancing aircraft should done moving radio around adding lead final balance point will estab lished flight testing start center-of-gravity shown plans regard less what airfoil chose Flying Try find helper make first few hand launches way some thing should out trim can sticks right away must admit lack finger hole makes difficult hand launch Glider forcefully grabbing just forward wing leading edge using javelin-type toss Im able get up 50-75 ft consistently Consortium very reliable performer off small high-start towline fact longest flights excess 45 mm have sort rather hand launches blame environment airplane Because models low weight short powerful 16 tubing larger ballfield type high-starts recommended act like slingshots highstarts airplane doesnt weigh enough keep parachute closed premature release almost inevitable parachute removed replaced streamer airplane has tendency overfly launch ring rubber about half expended best type high-start model made 35-50 ft 4-in-dia rubber whatever length string field dimensions will permit consistently get 200-ft-altitude launches windless days SOft rub ber 200 ft line slightest breeze can get over stake still stretching rubber slightly Using M-45 propeller airfoil Consor tium has good speed range stall predictable model requires Continued page 184 104 Model Aviation Left shot plug-in wings shows aluminum tubing epoxied place between spars first two bays left wing Wedg ing tube between spars assures correct dihedral Right mixture epoxy microballoons applied over crudely carved root blocks fuselage thoroughly waxed contact area prior pressing wings against sides create perfect mating surface photo shows wings pressed up against fuselage before epoxy begins set must make final incidence other alignment adjustments before epoxy hardens ne wings separated fuselage after epoxy completely cured ex posing formed mating surface Sand root block remove excess material fairs smoothly wings airfoil 3 New ARFs ZMP MONARCH AMA Sport Pattern span 66 area 750 sq motor 4 stroke 90 60 cu Preassembled balsa fuselage vdneered wing shaped balsa pail Lesan canopy epoxy cowl illustrated assembly manual c ZIMPRO MARKETING Pu suuJoltouKxIoGtTS3PSJO PiJOSE 51 axstex found didnt fly well rea son Extra damping quick control re sponse needed tame RC Helicopters much difficult fly full-size counterparts flybarless RC Helicopters depend stiff main rotor head improve vehicles pitch roll damping control power four-bladed hingeless head shown pictures made stacking two Baron 3OMX two-bladed hingeless heads result similar full-size Westland Lynx rotor head steel flexbeam hub gives comparable flap flexibil ity other type hingeless head BO-105 made MBB acquires its flap flexibility through fiberglass blades Wik Modelle also produces BO-105 hingeless hub blades As heads better depends whether youre talk ing Germans British original-design bearingless rotor head uses flexbeam provide bending torsion Its machined special petroleum-based synthetic called Torlon Manufactured Amoco Petroleum Prod ucts Torlon has properties steel costs about 100 times 2-ft-sq piece sells around $700 aluminum post can added top head support flybar shown pic tures friend Joe Medrano expert sheet metalist machined number rotor Sachs Doimar Engines New Torque Customized TG Only 100% SACHS Engine 27All Engines Complete $360 NNothing Buy 31See us 100 TOLEDO Show *40000 37 *43000 42 $46000 add $50 throttlecoupled spark advance Along 27 8 32 lightweight spring start flywheel-type Sachs Dolmar Engine TG MFG 201427-3845 857 HIgh Mtn Rd N Haledon NJ 07508 heads shown photos stamped own Cobra side frames welded rear exhaust muffler Thank Joe Next months sequel will present -scale four-bladed bearingless model ro tor tested Glenn L Martin wind tun nel University Maryland Along million-dollar tunnel youll see some exotic blades swashplates miniature hydraulic servo actuators control sys tems Consortium/Hunt Continued page 104 slight down elevator pick up hold some speed chasing next thermal Ron Farkas built model Ep pIer 201 airfoil its higher weight 3 oz heavier thinner wing version flies just well higher speed Oth ers made Clark Y RAF 32 Ep pIer 193 airfoils scheduled flown soon after article submitted As builder get bored very easily same old construction techniques same old low-wing sport high-wing trainer airplanes Im hobby learn well have fun certainly did both designing Consortium hope reading about project has acquaint ed some new techniques build ing designing model airplanes youve got urge try something differentand little time spend workshopthis classy-looking good-per forming Sailplane will give lot fun small flying field RC Soaring/Blakeslee Continued page 43 museum its displays programs will knock out Make effort joinor visit join t guarantee youll regret either address National Soaring Museum RD#3 Har ris Hill Elmira NY 14903 Thanks Cal Weiss taking time tell us about NSM Im sure model Glider fliers appreciate learning about will plan stop area tn cover letter Cal mentioned tht photos prt vided Shirley Sliwa Director NSM C also passed along personal information am retired NASA Lewis Researe Center Cleveland last 22 3 years directed work Educ tional Services Office Several notable moc elers Chet Lanzo Warren Plohr Reich brothers see Warren occasion club fieldI am member America Airlines Model Club Chet course just rc cently passed away Way back membe Board NAR along John Worth kind establishes Ive fiel bit time fact know few real pros should add fly almost week Jo Elgin designer Playboy makes no bet ter flier models t have active witl RC Gliders five years am having ball managed 1 hr. 15 mm flight oh Windrifter summer Lord t t did kept pulling up kept trying keep sight reasonable alti tude tm interested areas aviation top soaring tt has always fascinated mt just because beauty carries over intc modeling Scale look beauty RC Sailplane much like real thing anything dont like its beautiful Seal model Cub flies what appears super sonic speeds wife also loves sailplanes ant together have attended several Nationals ant regional contests spectators fact las visit museum dedication thi same time Region 3 contest Harris Hill 1 guess natural believi other Sailplane modelers also interested thi full-size ones museum Its reasot put article together Perhaps some mod elers within reach museum will make ths effort visit live too far away perhaps article will interest may wish become members event atr turned want pass information tc others International Postal Challenge Old-time readers column will remember previous re ports Kale Harden Palm Harbor FL IPC idea behind postal contest club several countries fly same contest same day compare results mail sure its interesting fun-fly con cept way meet Sailplaners other countries Kale Pelicans Club St Pete sent reContinued page J& 184 Model Aviation Special Introductory Offer SUKHOI Su-26M15 ScaleIMPALA Masters Pattern span 68 area 890 sq motor 4 stroke 120 equivspan 68 area 800 sq motor 4 stroke 120 60 rear Preassembled lightweight epoxy fuselage sheeted plug-in wingsPreassembled balsa fusefage veneered plug-in wings & stabs sheeted stab fin & rudder 8 dia epoxy cowl Lexan canopy &Epoxy cowl pipe cover removable canopy Illustrated illustrated assembly manualassembly manual see hobby dealer order direct
Edition: Model Aviation - 1990/04
Page Numbers: 93, 94, 95, 96, 101, 102, 104, 184
IT WAS CASE lunchtime hying squeeze As company work has ex panded lunchtime flying field has shrinking around writing di mensions field approximately 150 yards square down nearly 400 yards square tremendous loss area already prompted elimination RC aircraft over 20 cu knew something needed done efficiently safely utilize what left field have al ways liked idea flying Gliders lunchtime Theyre clean require less field support equipment no big heavy field box did some research small Hand-Launched RC Glider kits cur rently available didnt find anything really grabbed aesthetically short jump decision de sign own Consortium began take shape decided design requirements built one-piece wing aircraft fit easily small Toyota liftback made plug-in wings would have strong enough take standard high-start tow load fuselage look sexyno slab sides Strong Top Consortium flight what looks promising inermai weather 15-meter Sail plane looks flies much like larger counterparts Above author launching M-45 airfoil-equipped version Vermont Mountain Retreat small high-start launched Glider high enough go thermal hunting over thickly wooded slope background April 1990 93 Ron Farkas launching Eppler 201 airfoilThis Consortium built authors friend Ron Farkas Its equipped Epplerequipped Glider high-start struc 201 airfoIl giving thinner wing making slightly heavier about three ounces thantures background give some idea authors prototype thin-winged version flies just well considerably fasterthe limited size lunchtime flying field 3 1 Consortium flying past expanded office building complex spawned idea developina small multifunction Glider may tight squeeze fits Ron Farkas Glider seen its 225-mAh battery pack standard Futaba servos hidden under wing rather large Futaba rkrn kIte stiffeners around Fuselage cutout upside-down canopy Lonsortlum crew right left Bob Aberle Ron Farkas Howie Applegate Tom Hunt Hank Stumpf Nick Dannendorfer Other Consortium builders pi include Paul Bell George Myers Scott Conover Bob Roth Jr Phil John Kicisler Ron Zulow Phil Kielsier recently finished flew Clark V-equipped Consortium its understood RAF 32 Eppler 193 airfoil-equipped versions would soon flying 94 Model Aviation T-tail looks performance out harms way launching landing Rudder/elevator control keep sim ple variants include coupled ai leron rudder Finally aircraft should have lightweight structure good performance design emerged 60-in-span built-up constant-chord polyhedral wing Wing area 345 sq Building shapely non-slab-sided fuselage out balsa would have added too much weight fiberglass construction chosen later Control provided constant-chord stabilator top molded-in fin/fuse lage adjoining rudder Though may seem rather bulbous some tastes fuselage proportioned permit use standard-size radio gear use 225or 100-mAh receiver pack total weight may little what youd get mis stage heavy 6-az cloth draped over nose section uru oca 1fle trailing edge forward nose Apply resin nerously Right photo 2-oz cloth has applied wing trailing edge point aft fin plus some forward overlap systems offer just miniservos standard-size receiver Total weight odel should between 14 20 ounces Something told project ing popular fellow ers Sure enough no sooner showed ound some first draft plans men ned fuselage would fiberglass dreaded words isiness heard want So offered produce fuselages ub members no cost expected return told airplane built just collect dust base ent also expected posed photographs builders models near pressmefinished Thoughts lunchtime Precision Dura contests soon followed builder iould vary basic design choos g own airfoil could irfoils shown plans another wn choice Construction uselage Fiberglass construction tends care lot people away especially must done scratch case scratch means creating master out some easily workable material bass wood foam Prepare master release agent Position jig half ex posed begin heavy glass layup exposed surface produce female mold half fuselage Allow first half cure flip over master re peat process other half Use medium-weight glass lay up fuse lage molds Join two halves theyre still wet molds After final curing sepa rate molds sand edges newly formed fuselage Whew Youve fi nally got something can attach wings tail Its lot work fuselage unless Consortium will also club venture Keep mind smoother accurate master better mold However theres easierand equally sat isfyingway creating light strong fi berglass parts mold needs done create shape part soft wood pine fine basswood bet ter Carve shape wood using tem plates guide isnt necessary repli cate exact contour just sure part looks symmetrical shape satis factory seal wood sanding seal er Drill /8-in hole nose other tail support part jig Any type crude jig built house hold lumber pile fine see photos Cover entire mold fiberglass re lease agent available auto supply stores marinas Cut out oversized piece 2-oz glass cloth K&B medium approximately shape fuselage Drape cloth over left-hand side fuselage gently coax hand shape fuselage Mark fiberglass felt-tip marker about /4 % farther around onto right-hand side fuselage continuing way around profile Remove glass cut along line just fin ished marking Put piece glass onto some stiff cardboard transfer shape Cut out cardboard duplicate now pattern producing glass lay ers After much experimentation strongest lightest fuselage obtained cut ting out two left right sides layApril 1990 95 second layer 2-oz cloth draped over entire fuselage underlying layers still wet still wet resin rked second layer Right cured fuselage plug still inside has carefully wet sanded until its perfectly smooth ers entire profile K&B mediumweight cloth approximately 2 oz cloth becomes outside layer make inside nose layer cut out two profiles approximately trailing edge wing forward using K&B heavy cloth ap proximately 6 oz Cut two profiles K&B medium cloth trailing edge wing aft fin allowing some forward overlap inside layer tail boom fin Begin laying up heavier nose layer Dont worry doesnt conform tight nose radiuswell fix later pine nose block Continue wet layup medium-weight glass cloth aft wing position sections secure drape full-length piece over first layers dab dry brush against glass bring resin surface wetting outside layer thoroughly Try get outside layer thoroughly wet using ad ditional resin cup since will have sanded off later Allow resin cure thoroughly remove glass-wrapped plug fixture Take slop sink basement dont have slop sink dont have basement call self modeler start wet sanding fuselage its still plug Continue sanding until youre happy finish Dont prime fuselage sandable primer unless want sand off tween coats primer does highlight holes lumps very well its also very heavy Once finish acceptable apply three four layers masking tape along entire bottom centerline fuselage length Remove reusable plug cutting through fuselage along maskingtape guideline fine-toothed X-Acto saw Dont worry about scratching up plug sawing Its outside fi berglass outside plug needs smooth nice finish After 13 fuselages plug looks like heck still produces nice parts Once have sawn through entire bottom glass fuselage begin prying off plug plug properly waxed will separate easily glass should able quickly extract plug 96 Model Aviation through bottom fuselage min imal effort now have choice make must rejoin lower fuselage /2-in strip cloth resin can outside sanding smooth after curing can proceed lay out cut off canopy rejoin lower fuselage inside Believe doing inside isnt easy Reaching down long narrow tail boom place cloth resin difficult though its cer tainly possible experienced glass work Glue fin tail post once canopy has cut off Let say few words about compat ibility glues fiberglass used polyester resin lay up fuselage must use glue well Five-minute ep oxy wont stick well polyester no matter clean roughed up surface ever used epoxy resin laminate standard epoxy glue may used sure though clean mating surfaces thoroughly alcohol thinner rough up glass bit use CyA cyanoacrylate glues Continued page 101 Left This photo shows bottom seam Carefully apply five six layers masking tape along side seam act guide X-Acto saw seen photo right Right saw used split entire bottom fuselage open sort like gutting fish Left After complete incision has made fuselage plug may extracted glass fuselage pulling fin seen photo Right fuselage plug bottom completely removed new glass fuselage plug can used over over again Left area cutting out canopy masked off Note hole fuselage just aft canopy 3A-in steel wing rod Right canopy has cut out using X-Acto saw photo Stiffeners must now installed canopy fuselage bonding anything fiberglass Although bond feels strong tension glue cannot take shearing forces produced fuselage flexes encounters sudden impact hard landing RTV silicon glues make good alterna tive regardless type resin used overnight cure types such Dow Cornings 3145 high-strength/high-tempera ture silicon glue/sealant work best can found good electrical supply house Again no matter what glue use absolutely certain release agent has removed mating surfaces inside fuselage Sand down fiberglass nose un til clean cross section obtained Cut small block pine approximate shape nose glue fuse lage Sand shape making sure nose radius too sharp Cut out glue canopy area stiffen ers %-in balsa A1 ply doublers fuselage cut out glue stiffeners canopy itself Glue %2 ply inner liner side inside wall fin halves assuring %2-in gap between two liners %2 ply blade glued stabilator will slide pivot Install two Sullivan light cables sheaths aft fuselage time point another decision must made want one-piece airplane plug-in wings one-piece wing mark fuselage conform chosen airfoil cut away necessary fiberglass Set fuse lage aside until final assembly plug-in wings position firmly ep oxy 3/6-OD brass aluminum wing rod place set fuselage aside until final assembly Wings Basic top bottom spar construc tion used save weight upper leading edge sheeted Choose airfoils shown plan cut 26 iden tical ribs Construct outer panels first building right over plan per standard proce dure Pin ribs place add leading trailing edge stock install top spar Add leading edge sheeting re move wing plan install lower spar Though dont think shear webs nec essary outer panel conservative types may want add now stall wing tip blocks sand shape inner panel built much same way few exceptions out board rib must canted match out board section correct dihedral angle first three ribs must notched ac cept one-piece wing dihedral spar subspar tube mount plug-in wings youre building one-piece wing glue one-piece spar inboard pan nels Join two inboard halves checking dihedral correct Fill space beApril 1990 101 side view shows fiberglass f builtup rudder airfoiled stabilator Note early smaller version rud der proved inefficient larger efficient rudder shown plans horizontal tail sitting atop fiberglass fin stabilator can built flat airfoil author believes Glider performs better airfoiled configuration An end view down-turned carved Hoerner wing tip blocks Hoerner wing tip designed minimize air flow turbulence across end wing enhancing efficiency Continued page 102 downward turning wing tip seen trailing edge shot outer left wing pan el Note no shear webbing outer panel can however added makes comfortable Bear mind extra strength translates extra weight CONSORTIUM TOM HUNT 60 HAND LAUNCHED/SMAIF HIGH SA SAILPLANE IDHT 4 - 20 OZALL FLYINT IFABILYZEP wIND AREA 345 5015 /B PLYWOOD TAK PIVOT SUPPORT FLALNEI BRASS TUBE ROD AIFATNY TO IF OR STAB Il-IF INSIDE LIFICAL WITH -e BRASS KBE RYDER RAZOR SAW CANOPY EPON FYSIFACE/0-SI INBO PANFY ONLY RIFT GRADE PUOCERTEIF VA TOE SERVOS /32 PREP SYT REMOVED FROM iLlS SIDE FUR CLARIFY YB BALSA- /04 CANOPY STTFFENRT I/B 1 4 SPREE SPARS PPER YIF LOWER / A RIBS tween wings solid block soft balsa sand airfoil shape youre building two-piece plug-in wing glue A-in Lite Ply tube mount subspar both inboard sections point brass wing tube must installed Clear root rib tube will rest just under bottom top spar second rib should cleared middle third rib cleared just above top bottom spar will achieve maxi mum dihedral angle possible whatever airfoil have chosen Insert tube epoxy liberally A-in Lite Ply tube mount joining upper lower spars Add wing root filler block Sand block airfoil shape carve fit fuselage upon assembly Add 1/6-dia pin leading trailing edge secure incidence angle plugged fuselage Join inboard sections outboard panels using A-in Lite Ply dihe dral brace spar trailing edge Horizontal tail favor slab tails ease construction ignore airfoil shape shown plan believe airfoiled tails make better con trol proceed following steps Build tail building 3R-in-thick slab tail right over plan tail dry cut out two plywood templates airfoil shape tack glue onto tip caps Sand tail using long sanding block 120-grit paper thing rougher may snap ribs Cut out slot horizontal tail center line accept %2 ply blade pivot Drill A-in-dia hole Y32 ply pivot insert A-in-ID brass tube hole sand flush blade Cover tail blade favorite heat shrink ma terial Rudder Like horizontal tail rudder can probably built out scrap box Build slab sided over plan glue dry remove rudder plan sand wedge shape Bevel leading edge side onlya minimum 300 produces proper deflec tion installed one-sided bevel al lows surface hinge rudder tape trim MonoKote side fin giving effective rudder control Assembly Drill hole fin throug] glass cloth %2 ply liners th horizontal tail pivot Insert A-in-ID brass tube gluing securely Remove th section tube slot created tw /32 ply liners Insert horizontal tail bladi slot line up holes Place %2-dia brass pin pivot holes t check alignment freedom move ment Lightly sand away part binds making one-piece-wing version sert wing through opening fu selage checking alignment mci dence Sand fuselage necessary en sure good fit straightness Workinj through canopy opening glue winj fuselage using five-minute epox mixed microballoons plug-in version needs t done carve out inboard fille block fits fuselage snugly youre much carver isnt neces sary achieve exact fit just get Continued page 10 102 Model Aviation /025FY IF p e possible Wax outside fuselage area airfoil Apply mixture ep oxy microballoons roughly carved block Insert wing onto wing rod push against waxed fuselage epoxy thoroughly dry remove wing sand off excess epoxy slurry Install radio gear using positions shown plan guide cable tachment leading edge stabila tor can simple small piece brass tubing squashed flat soldered end cable Drill hole size small nail brad through flattened brass tube Insert nail through tube leading edge block tail Should hole balsa tail become sloppy simply remove nail wet hole thin CyA glue will close hole slightly regain tight fit After epoxying /6 wire tow hook place youre ready paint fuselage minimize weightremember paint heavyuse light primer coat choose dark color will cover two coats Assemble rudder fin using method described earlier Balancing aircraft should done moving radio around adding lead final balance point will estab lished flight testing start center-of-gravity shown plans regard less what airfoil chose Flying Try find helper make first few hand launches way some thing should out trim can sticks right away must admit lack finger hole makes difficult hand launch Glider forcefully grabbing just forward wing leading edge using javelin-type toss Im able get up 50-75 ft consistently Consortium very reliable performer off small high-start towline fact longest flights excess 45 mm have sort rather hand launches blame environment airplane Because models low weight short powerful 16 tubing larger ballfield type high-starts recommended act like slingshots highstarts airplane doesnt weigh enough keep parachute closed premature release almost inevitable parachute removed replaced streamer airplane has tendency overfly launch ring rubber about half expended best type high-start model made 35-50 ft 4-in-dia rubber whatever length string field dimensions will permit consistently get 200-ft-altitude launches windless days SOft rub ber 200 ft line slightest breeze can get over stake still stretching rubber slightly Using M-45 propeller airfoil Consor tium has good speed range stall predictable model requires Continued page 184 104 Model Aviation Left shot plug-in wings shows aluminum tubing epoxied place between spars first two bays left wing Wedg ing tube between spars assures correct dihedral Right mixture epoxy microballoons applied over crudely carved root blocks fuselage thoroughly waxed contact area prior pressing wings against sides create perfect mating surface photo shows wings pressed up against fuselage before epoxy begins set must make final incidence other alignment adjustments before epoxy hardens ne wings separated fuselage after epoxy completely cured ex posing formed mating surface Sand root block remove excess material fairs smoothly wings airfoil 3 New ARFs ZMP MONARCH AMA Sport Pattern span 66 area 750 sq motor 4 stroke 90 60 cu Preassembled balsa fuselage vdneered wing shaped balsa pail Lesan canopy epoxy cowl illustrated assembly manual c ZIMPRO MARKETING Pu suuJoltouKxIoGtTS3PSJO PiJOSE 51 axstex found didnt fly well rea son Extra damping quick control re sponse needed tame RC Helicopters much difficult fly full-size counterparts flybarless RC Helicopters depend stiff main rotor head improve vehicles pitch roll damping control power four-bladed hingeless head shown pictures made stacking two Baron 3OMX two-bladed hingeless heads result similar full-size Westland Lynx rotor head steel flexbeam hub gives comparable flap flexibil ity other type hingeless head BO-105 made MBB acquires its flap flexibility through fiberglass blades Wik Modelle also produces BO-105 hingeless hub blades As heads better depends whether youre talk ing Germans British original-design bearingless rotor head uses flexbeam provide bending torsion Its machined special petroleum-based synthetic called Torlon Manufactured Amoco Petroleum Prod ucts Torlon has properties steel costs about 100 times 2-ft-sq piece sells around $700 aluminum post can added top head support flybar shown pic tures friend Joe Medrano expert sheet metalist machined number rotor Sachs Doimar Engines New Torque Customized TG Only 100% SACHS Engine 27All Engines Complete $360 NNothing Buy 31See us 100 TOLEDO Show *40000 37 *43000 42 $46000 add $50 throttlecoupled spark advance Along 27 8 32 lightweight spring start flywheel-type Sachs Dolmar Engine TG MFG 201427-3845 857 HIgh Mtn Rd N Haledon NJ 07508 heads shown photos stamped own Cobra side frames welded rear exhaust muffler Thank Joe Next months sequel will present -scale four-bladed bearingless model ro tor tested Glenn L Martin wind tun nel University Maryland Along million-dollar tunnel youll see some exotic blades swashplates miniature hydraulic servo actuators control sys tems Consortium/Hunt Continued page 104 slight down elevator pick up hold some speed chasing next thermal Ron Farkas built model Ep pIer 201 airfoil its higher weight 3 oz heavier thinner wing version flies just well higher speed Oth ers made Clark Y RAF 32 Ep pIer 193 airfoils scheduled flown soon after article submitted As builder get bored very easily same old construction techniques same old low-wing sport high-wing trainer airplanes Im hobby learn well have fun certainly did both designing Consortium hope reading about project has acquaint ed some new techniques build ing designing model airplanes youve got urge try something differentand little time spend workshopthis classy-looking good-per forming Sailplane will give lot fun small flying field RC Soaring/Blakeslee Continued page 43 museum its displays programs will knock out Make effort joinor visit join t guarantee youll regret either address National Soaring Museum RD#3 Har ris Hill Elmira NY 14903 Thanks Cal Weiss taking time tell us about NSM Im sure model Glider fliers appreciate learning about will plan stop area tn cover letter Cal mentioned tht photos prt vided Shirley Sliwa Director NSM C also passed along personal information am retired NASA Lewis Researe Center Cleveland last 22 3 years directed work Educ tional Services Office Several notable moc elers Chet Lanzo Warren Plohr Reich brothers see Warren occasion club fieldI am member America Airlines Model Club Chet course just rc cently passed away Way back membe Board NAR along John Worth kind establishes Ive fiel bit time fact know few real pros should add fly almost week Jo Elgin designer Playboy makes no bet ter flier models t have active witl RC Gliders five years am having ball managed 1 hr. 15 mm flight oh Windrifter summer Lord t t did kept pulling up kept trying keep sight reasonable alti tude tm interested areas aviation top soaring tt has always fascinated mt just because beauty carries over intc modeling Scale look beauty RC Sailplane much like real thing anything dont like its beautiful Seal model Cub flies what appears super sonic speeds wife also loves sailplanes ant together have attended several Nationals ant regional contests spectators fact las visit museum dedication thi same time Region 3 contest Harris Hill 1 guess natural believi other Sailplane modelers also interested thi full-size ones museum Its reasot put article together Perhaps some mod elers within reach museum will make ths effort visit live too far away perhaps article will interest may wish become members event atr turned want pass information tc others International Postal Challenge Old-time readers column will remember previous re ports Kale Harden Palm Harbor FL IPC idea behind postal contest club several countries fly same contest same day compare results mail sure its interesting fun-fly con cept way meet Sailplaners other countries Kale Pelicans Club St Pete sent reContinued page J& 184 Model Aviation Special Introductory Offer SUKHOI Su-26M15 ScaleIMPALA Masters Pattern span 68 area 890 sq motor 4 stroke 120 equivspan 68 area 800 sq motor 4 stroke 120 60 rear Preassembled lightweight epoxy fuselage sheeted plug-in wingsPreassembled balsa fusefage veneered plug-in wings & stabs sheeted stab fin & rudder 8 dia epoxy cowl Lexan canopy &Epoxy cowl pipe cover removable canopy Illustrated illustrated assembly manualassembly manual see hobby dealer order direct
Edition: Model Aviation - 1990/04
Page Numbers: 93, 94, 95, 96, 101, 102, 104, 184
IT WAS CASE lunchtime hying squeeze As company work has ex panded lunchtime flying field has shrinking around writing di mensions field approximately 150 yards square down nearly 400 yards square tremendous loss area already prompted elimination RC aircraft over 20 cu knew something needed done efficiently safely utilize what left field have al ways liked idea flying Gliders lunchtime Theyre clean require less field support equipment no big heavy field box did some research small Hand-Launched RC Glider kits cur rently available didnt find anything really grabbed aesthetically short jump decision de sign own Consortium began take shape decided design requirements built one-piece wing aircraft fit easily small Toyota liftback made plug-in wings would have strong enough take standard high-start tow load fuselage look sexyno slab sides Strong Top Consortium flight what looks promising inermai weather 15-meter Sail plane looks flies much like larger counterparts Above author launching M-45 airfoil-equipped version Vermont Mountain Retreat small high-start launched Glider high enough go thermal hunting over thickly wooded slope background April 1990 93 Ron Farkas launching Eppler 201 airfoilThis Consortium built authors friend Ron Farkas Its equipped Epplerequipped Glider high-start struc 201 airfoIl giving thinner wing making slightly heavier about three ounces thantures background give some idea authors prototype thin-winged version flies just well considerably fasterthe limited size lunchtime flying field 3 1 Consortium flying past expanded office building complex spawned idea developina small multifunction Glider may tight squeeze fits Ron Farkas Glider seen its 225-mAh battery pack standard Futaba servos hidden under wing rather large Futaba rkrn kIte stiffeners around Fuselage cutout upside-down canopy Lonsortlum crew right left Bob Aberle Ron Farkas Howie Applegate Tom Hunt Hank Stumpf Nick Dannendorfer Other Consortium builders pi include Paul Bell George Myers Scott Conover Bob Roth Jr Phil John Kicisler Ron Zulow Phil Kielsier recently finished flew Clark V-equipped Consortium its understood RAF 32 Eppler 193 airfoil-equipped versions would soon flying 94 Model Aviation T-tail looks performance out harms way launching landing Rudder/elevator control keep sim ple variants include coupled ai leron rudder Finally aircraft should have lightweight structure good performance design emerged 60-in-span built-up constant-chord polyhedral wing Wing area 345 sq Building shapely non-slab-sided fuselage out balsa would have added too much weight fiberglass construction chosen later Control provided constant-chord stabilator top molded-in fin/fuse lage adjoining rudder Though may seem rather bulbous some tastes fuselage proportioned permit use standard-size radio gear use 225or 100-mAh receiver pack total weight may little what youd get mis stage heavy 6-az cloth draped over nose section uru oca 1fle trailing edge forward nose Apply resin nerously Right photo 2-oz cloth has applied wing trailing edge point aft fin plus some forward overlap systems offer just miniservos standard-size receiver Total weight odel should between 14 20 ounces Something told project ing popular fellow ers Sure enough no sooner showed ound some first draft plans men ned fuselage would fiberglass dreaded words isiness heard want So offered produce fuselages ub members no cost expected return told airplane built just collect dust base ent also expected posed photographs builders models near pressmefinished Thoughts lunchtime Precision Dura contests soon followed builder iould vary basic design choos g own airfoil could irfoils shown plans another wn choice Construction uselage Fiberglass construction tends care lot people away especially must done scratch case scratch means creating master out some easily workable material bass wood foam Prepare master release agent Position jig half ex posed begin heavy glass layup exposed surface produce female mold half fuselage Allow first half cure flip over master re peat process other half Use medium-weight glass lay up fuse lage molds Join two halves theyre still wet molds After final curing sepa rate molds sand edges newly formed fuselage Whew Youve fi nally got something can attach wings tail Its lot work fuselage unless Consortium will also club venture Keep mind smoother accurate master better mold However theres easierand equally sat isfyingway creating light strong fi berglass parts mold needs done create shape part soft wood pine fine basswood bet ter Carve shape wood using tem plates guide isnt necessary repli cate exact contour just sure part looks symmetrical shape satis factory seal wood sanding seal er Drill /8-in hole nose other tail support part jig Any type crude jig built house hold lumber pile fine see photos Cover entire mold fiberglass re lease agent available auto supply stores marinas Cut out oversized piece 2-oz glass cloth K&B medium approximately shape fuselage Drape cloth over left-hand side fuselage gently coax hand shape fuselage Mark fiberglass felt-tip marker about /4 % farther around onto right-hand side fuselage continuing way around profile Remove glass cut along line just fin ished marking Put piece glass onto some stiff cardboard transfer shape Cut out cardboard duplicate now pattern producing glass lay ers After much experimentation strongest lightest fuselage obtained cut ting out two left right sides layApril 1990 95 second layer 2-oz cloth draped over entire fuselage underlying layers still wet still wet resin rked second layer Right cured fuselage plug still inside has carefully wet sanded until its perfectly smooth ers entire profile K&B mediumweight cloth approximately 2 oz cloth becomes outside layer make inside nose layer cut out two profiles approximately trailing edge wing forward using K&B heavy cloth ap proximately 6 oz Cut two profiles K&B medium cloth trailing edge wing aft fin allowing some forward overlap inside layer tail boom fin Begin laying up heavier nose layer Dont worry doesnt conform tight nose radiuswell fix later pine nose block Continue wet layup medium-weight glass cloth aft wing position sections secure drape full-length piece over first layers dab dry brush against glass bring resin surface wetting outside layer thoroughly Try get outside layer thoroughly wet using ad ditional resin cup since will have sanded off later Allow resin cure thoroughly remove glass-wrapped plug fixture Take slop sink basement dont have slop sink dont have basement call self modeler start wet sanding fuselage its still plug Continue sanding until youre happy finish Dont prime fuselage sandable primer unless want sand off tween coats primer does highlight holes lumps very well its also very heavy Once finish acceptable apply three four layers masking tape along entire bottom centerline fuselage length Remove reusable plug cutting through fuselage along maskingtape guideline fine-toothed X-Acto saw Dont worry about scratching up plug sawing Its outside fi berglass outside plug needs smooth nice finish After 13 fuselages plug looks like heck still produces nice parts Once have sawn through entire bottom glass fuselage begin prying off plug plug properly waxed will separate easily glass should able quickly extract plug 96 Model Aviation through bottom fuselage min imal effort now have choice make must rejoin lower fuselage /2-in strip cloth resin can outside sanding smooth after curing can proceed lay out cut off canopy rejoin lower fuselage inside Believe doing inside isnt easy Reaching down long narrow tail boom place cloth resin difficult though its cer tainly possible experienced glass work Glue fin tail post once canopy has cut off Let say few words about compat ibility glues fiberglass used polyester resin lay up fuselage must use glue well Five-minute ep oxy wont stick well polyester no matter clean roughed up surface ever used epoxy resin laminate standard epoxy glue may used sure though clean mating surfaces thoroughly alcohol thinner rough up glass bit use CyA cyanoacrylate glues Continued page 101 Left This photo shows bottom seam Carefully apply five six layers masking tape along side seam act guide X-Acto saw seen photo right Right saw used split entire bottom fuselage open sort like gutting fish Left After complete incision has made fuselage plug may extracted glass fuselage pulling fin seen photo Right fuselage plug bottom completely removed new glass fuselage plug can used over over again Left area cutting out canopy masked off Note hole fuselage just aft canopy 3A-in steel wing rod Right canopy has cut out using X-Acto saw photo Stiffeners must now installed canopy fuselage bonding anything fiberglass Although bond feels strong tension glue cannot take shearing forces produced fuselage flexes encounters sudden impact hard landing RTV silicon glues make good alterna tive regardless type resin used overnight cure types such Dow Cornings 3145 high-strength/high-tempera ture silicon glue/sealant work best can found good electrical supply house Again no matter what glue use absolutely certain release agent has removed mating surfaces inside fuselage Sand down fiberglass nose un til clean cross section obtained Cut small block pine approximate shape nose glue fuse lage Sand shape making sure nose radius too sharp Cut out glue canopy area stiffen ers %-in balsa A1 ply doublers fuselage cut out glue stiffeners canopy itself Glue %2 ply inner liner side inside wall fin halves assuring %2-in gap between two liners %2 ply blade glued stabilator will slide pivot Install two Sullivan light cables sheaths aft fuselage time point another decision must made want one-piece airplane plug-in wings one-piece wing mark fuselage conform chosen airfoil cut away necessary fiberglass Set fuse lage aside until final assembly plug-in wings position firmly ep oxy 3/6-OD brass aluminum wing rod place set fuselage aside until final assembly Wings Basic top bottom spar construc tion used save weight upper leading edge sheeted Choose airfoils shown plan cut 26 iden tical ribs Construct outer panels first building right over plan per standard proce dure Pin ribs place add leading trailing edge stock install top spar Add leading edge sheeting re move wing plan install lower spar Though dont think shear webs nec essary outer panel conservative types may want add now stall wing tip blocks sand shape inner panel built much same way few exceptions out board rib must canted match out board section correct dihedral angle first three ribs must notched ac cept one-piece wing dihedral spar subspar tube mount plug-in wings youre building one-piece wing glue one-piece spar inboard pan nels Join two inboard halves checking dihedral correct Fill space beApril 1990 101 side view shows fiberglass f builtup rudder airfoiled stabilator Note early smaller version rud der proved inefficient larger efficient rudder shown plans horizontal tail sitting atop fiberglass fin stabilator can built flat airfoil author believes Glider performs better airfoiled configuration An end view down-turned carved Hoerner wing tip blocks Hoerner wing tip designed minimize air flow turbulence across end wing enhancing efficiency Continued page 102 downward turning wing tip seen trailing edge shot outer left wing pan el Note no shear webbing outer panel can however added makes comfortable Bear mind extra strength translates extra weight CONSORTIUM TOM HUNT 60 HAND LAUNCHED/SMAIF HIGH SA SAILPLANE IDHT 4 - 20 OZALL FLYINT IFABILYZEP wIND AREA 345 5015 /B PLYWOOD TAK PIVOT SUPPORT FLALNEI BRASS TUBE ROD AIFATNY TO IF OR STAB Il-IF INSIDE LIFICAL WITH -e BRASS KBE RYDER RAZOR SAW CANOPY EPON FYSIFACE/0-SI INBO PANFY ONLY RIFT GRADE PUOCERTEIF VA TOE SERVOS /32 PREP SYT REMOVED FROM iLlS SIDE FUR CLARIFY YB BALSA- /04 CANOPY STTFFENRT I/B 1 4 SPREE SPARS PPER YIF LOWER / A RIBS tween wings solid block soft balsa sand airfoil shape youre building two-piece plug-in wing glue A-in Lite Ply tube mount subspar both inboard sections point brass wing tube must installed Clear root rib tube will rest just under bottom top spar second rib should cleared middle third rib cleared just above top bottom spar will achieve maxi mum dihedral angle possible whatever airfoil have chosen Insert tube epoxy liberally A-in Lite Ply tube mount joining upper lower spars Add wing root filler block Sand block airfoil shape carve fit fuselage upon assembly Add 1/6-dia pin leading trailing edge secure incidence angle plugged fuselage Join inboard sections outboard panels using A-in Lite Ply dihe dral brace spar trailing edge Horizontal tail favor slab tails ease construction ignore airfoil shape shown plan believe airfoiled tails make better con trol proceed following steps Build tail building 3R-in-thick slab tail right over plan tail dry cut out two plywood templates airfoil shape tack glue onto tip caps Sand tail using long sanding block 120-grit paper thing rougher may snap ribs Cut out slot horizontal tail center line accept %2 ply blade pivot Drill A-in-dia hole Y32 ply pivot insert A-in-ID brass tube hole sand flush blade Cover tail blade favorite heat shrink ma terial Rudder Like horizontal tail rudder can probably built out scrap box Build slab sided over plan glue dry remove rudder plan sand wedge shape Bevel leading edge side onlya minimum 300 produces proper deflec tion installed one-sided bevel al lows surface hinge rudder tape trim MonoKote side fin giving effective rudder control Assembly Drill hole fin throug] glass cloth %2 ply liners th horizontal tail pivot Insert A-in-ID brass tube gluing securely Remove th section tube slot created tw /32 ply liners Insert horizontal tail bladi slot line up holes Place %2-dia brass pin pivot holes t check alignment freedom move ment Lightly sand away part binds making one-piece-wing version sert wing through opening fu selage checking alignment mci dence Sand fuselage necessary en sure good fit straightness Workinj through canopy opening glue winj fuselage using five-minute epox mixed microballoons plug-in version needs t done carve out inboard fille block fits fuselage snugly youre much carver isnt neces sary achieve exact fit just get Continued page 10 102 Model Aviation /025FY IF p e possible Wax outside fuselage area airfoil Apply mixture ep oxy microballoons roughly carved block Insert wing onto wing rod push against waxed fuselage epoxy thoroughly dry remove wing sand off excess epoxy slurry Install radio gear using positions shown plan guide cable tachment leading edge stabila tor can simple small piece brass tubing squashed flat soldered end cable Drill hole size small nail brad through flattened brass tube Insert nail through tube leading edge block tail Should hole balsa tail become sloppy simply remove nail wet hole thin CyA glue will close hole slightly regain tight fit After epoxying /6 wire tow hook place youre ready paint fuselage minimize weightremember paint heavyuse light primer coat choose dark color will cover two coats Assemble rudder fin using method described earlier Balancing aircraft should done moving radio around adding lead final balance point will estab lished flight testing start center-of-gravity shown plans regard less what airfoil chose Flying Try find helper make first few hand launches way some thing should out trim can sticks right away must admit lack finger hole makes difficult hand launch Glider forcefully grabbing just forward wing leading edge using javelin-type toss Im able get up 50-75 ft consistently Consortium very reliable performer off small high-start towline fact longest flights excess 45 mm have sort rather hand launches blame environment airplane Because models low weight short powerful 16 tubing larger ballfield type high-starts recommended act like slingshots highstarts airplane doesnt weigh enough keep parachute closed premature release almost inevitable parachute removed replaced streamer airplane has tendency overfly launch ring rubber about half expended best type high-start model made 35-50 ft 4-in-dia rubber whatever length string field dimensions will permit consistently get 200-ft-altitude launches windless days SOft rub ber 200 ft line slightest breeze can get over stake still stretching rubber slightly Using M-45 propeller airfoil Consor tium has good speed range stall predictable model requires Continued page 184 104 Model Aviation Left shot plug-in wings shows aluminum tubing epoxied place between spars first two bays left wing Wedg ing tube between spars assures correct dihedral Right mixture epoxy microballoons applied over crudely carved root blocks fuselage thoroughly waxed contact area prior pressing wings against sides create perfect mating surface photo shows wings pressed up against fuselage before epoxy begins set must make final incidence other alignment adjustments before epoxy hardens ne wings separated fuselage after epoxy completely cured ex posing formed mating surface Sand root block remove excess material fairs smoothly wings airfoil 3 New ARFs ZMP MONARCH AMA Sport Pattern span 66 area 750 sq motor 4 stroke 90 60 cu Preassembled balsa fuselage vdneered wing shaped balsa pail Lesan canopy epoxy cowl illustrated assembly manual c ZIMPRO MARKETING Pu suuJoltouKxIoGtTS3PSJO PiJOSE 51 axstex found didnt fly well rea son Extra damping quick control re sponse needed tame RC Helicopters much difficult fly full-size counterparts flybarless RC Helicopters depend stiff main rotor head improve vehicles pitch roll damping control power four-bladed hingeless head shown pictures made stacking two Baron 3OMX two-bladed hingeless heads result similar full-size Westland Lynx rotor head steel flexbeam hub gives comparable flap flexibil ity other type hingeless head BO-105 made MBB acquires its flap flexibility through fiberglass blades Wik Modelle also produces BO-105 hingeless hub blades As heads better depends whether youre talk ing Germans British original-design bearingless rotor head uses flexbeam provide bending torsion Its machined special petroleum-based synthetic called Torlon Manufactured Amoco Petroleum Prod ucts Torlon has properties steel costs about 100 times 2-ft-sq piece sells around $700 aluminum post can added top head support flybar shown pic tures friend Joe Medrano expert sheet metalist machined number rotor Sachs Doimar Engines New Torque Customized TG Only 100% SACHS Engine 27All Engines Complete $360 NNothing Buy 31See us 100 TOLEDO Show *40000 37 *43000 42 $46000 add $50 throttlecoupled spark advance Along 27 8 32 lightweight spring start flywheel-type Sachs Dolmar Engine TG MFG 201427-3845 857 HIgh Mtn Rd N Haledon NJ 07508 heads shown photos stamped own Cobra side frames welded rear exhaust muffler Thank Joe Next months sequel will present -scale four-bladed bearingless model ro tor tested Glenn L Martin wind tun nel University Maryland Along million-dollar tunnel youll see some exotic blades swashplates miniature hydraulic servo actuators control sys tems Consortium/Hunt Continued page 104 slight down elevator pick up hold some speed chasing next thermal Ron Farkas built model Ep pIer 201 airfoil its higher weight 3 oz heavier thinner wing version flies just well higher speed Oth ers made Clark Y RAF 32 Ep pIer 193 airfoils scheduled flown soon after article submitted As builder get bored very easily same old construction techniques same old low-wing sport high-wing trainer airplanes Im hobby learn well have fun certainly did both designing Consortium hope reading about project has acquaint ed some new techniques build ing designing model airplanes youve got urge try something differentand little time spend workshopthis classy-looking good-per forming Sailplane will give lot fun small flying field RC Soaring/Blakeslee Continued page 43 museum its displays programs will knock out Make effort joinor visit join t guarantee youll regret either address National Soaring Museum RD#3 Har ris Hill Elmira NY 14903 Thanks Cal Weiss taking time tell us about NSM Im sure model Glider fliers appreciate learning about will plan stop area tn cover letter Cal mentioned tht photos prt vided Shirley Sliwa Director NSM C also passed along personal information am retired NASA Lewis Researe Center Cleveland last 22 3 years directed work Educ tional Services Office Several notable moc elers Chet Lanzo Warren Plohr Reich brothers see Warren occasion club fieldI am member America Airlines Model Club Chet course just rc cently passed away Way back membe Board NAR along John Worth kind establishes Ive fiel bit time fact know few real pros should add fly almost week Jo Elgin designer Playboy makes no bet ter flier models t have active witl RC Gliders five years am having ball managed 1 hr. 15 mm flight oh Windrifter summer Lord t t did kept pulling up kept trying keep sight reasonable alti tude tm interested areas aviation top soaring tt has always fascinated mt just because beauty carries over intc modeling Scale look beauty RC Sailplane much like real thing anything dont like its beautiful Seal model Cub flies what appears super sonic speeds wife also loves sailplanes ant together have attended several Nationals ant regional contests spectators fact las visit museum dedication thi same time Region 3 contest Harris Hill 1 guess natural believi other Sailplane modelers also interested thi full-size ones museum Its reasot put article together Perhaps some mod elers within reach museum will make ths effort visit live too far away perhaps article will interest may wish become members event atr turned want pass information tc others International Postal Challenge Old-time readers column will remember previous re ports Kale Harden Palm Harbor FL IPC idea behind postal contest club several countries fly same contest same day compare results mail sure its interesting fun-fly con cept way meet Sailplaners other countries Kale Pelicans Club St Pete sent reContinued page J& 184 Model Aviation Special Introductory Offer SUKHOI Su-26M15 ScaleIMPALA Masters Pattern span 68 area 890 sq motor 4 stroke 120 equivspan 68 area 800 sq motor 4 stroke 120 60 rear Preassembled lightweight epoxy fuselage sheeted plug-in wingsPreassembled balsa fusefage veneered plug-in wings & stabs sheeted stab fin & rudder 8 dia epoxy cowl Lexan canopy &Epoxy cowl pipe cover removable canopy Illustrated illustrated assembly manualassembly manual see hobby dealer order direct
Edition: Model Aviation - 1990/04
Page Numbers: 93, 94, 95, 96, 101, 102, 104, 184
IT WAS CASE lunchtime hying squeeze As company work has ex panded lunchtime flying field has shrinking around writing di mensions field approximately 150 yards square down nearly 400 yards square tremendous loss area already prompted elimination RC aircraft over 20 cu knew something needed done efficiently safely utilize what left field have al ways liked idea flying Gliders lunchtime Theyre clean require less field support equipment no big heavy field box did some research small Hand-Launched RC Glider kits cur rently available didnt find anything really grabbed aesthetically short jump decision de sign own Consortium began take shape decided design requirements built one-piece wing aircraft fit easily small Toyota liftback made plug-in wings would have strong enough take standard high-start tow load fuselage look sexyno slab sides Strong Top Consortium flight what looks promising inermai weather 15-meter Sail plane looks flies much like larger counterparts Above author launching M-45 airfoil-equipped version Vermont Mountain Retreat small high-start launched Glider high enough go thermal hunting over thickly wooded slope background April 1990 93 Ron Farkas launching Eppler 201 airfoilThis Consortium built authors friend Ron Farkas Its equipped Epplerequipped Glider high-start struc 201 airfoIl giving thinner wing making slightly heavier about three ounces thantures background give some idea authors prototype thin-winged version flies just well considerably fasterthe limited size lunchtime flying field 3 1 Consortium flying past expanded office building complex spawned idea developina small multifunction Glider may tight squeeze fits Ron Farkas Glider seen its 225-mAh battery pack standard Futaba servos hidden under wing rather large Futaba rkrn kIte stiffeners around Fuselage cutout upside-down canopy Lonsortlum crew right left Bob Aberle Ron Farkas Howie Applegate Tom Hunt Hank Stumpf Nick Dannendorfer Other Consortium builders pi include Paul Bell George Myers Scott Conover Bob Roth Jr Phil John Kicisler Ron Zulow Phil Kielsier recently finished flew Clark V-equipped Consortium its understood RAF 32 Eppler 193 airfoil-equipped versions would soon flying 94 Model Aviation T-tail looks performance out harms way launching landing Rudder/elevator control keep sim ple variants include coupled ai leron rudder Finally aircraft should have lightweight structure good performance design emerged 60-in-span built-up constant-chord polyhedral wing Wing area 345 sq Building shapely non-slab-sided fuselage out balsa would have added too much weight fiberglass construction chosen later Control provided constant-chord stabilator top molded-in fin/fuse lage adjoining rudder Though may seem rather bulbous some tastes fuselage proportioned permit use standard-size radio gear use 225or 100-mAh receiver pack total weight may little what youd get mis stage heavy 6-az cloth draped over nose section uru oca 1fle trailing edge forward nose Apply resin nerously Right photo 2-oz cloth has applied wing trailing edge point aft fin plus some forward overlap systems offer just miniservos standard-size receiver Total weight odel should between 14 20 ounces Something told project ing popular fellow ers Sure enough no sooner showed ound some first draft plans men ned fuselage would fiberglass dreaded words isiness heard want So offered produce fuselages ub members no cost expected return told airplane built just collect dust base ent also expected posed photographs builders models near pressmefinished Thoughts lunchtime Precision Dura contests soon followed builder iould vary basic design choos g own airfoil could irfoils shown plans another wn choice Construction uselage Fiberglass construction tends care lot people away especially must done scratch case scratch means creating master out some easily workable material bass wood foam Prepare master release agent Position jig half ex posed begin heavy glass layup exposed surface produce female mold half fuselage Allow first half cure flip over master re peat process other half Use medium-weight glass lay up fuse lage molds Join two halves theyre still wet molds After final curing sepa rate molds sand edges newly formed fuselage Whew Youve fi nally got something can attach wings tail Its lot work fuselage unless Consortium will also club venture Keep mind smoother accurate master better mold However theres easierand equally sat isfyingway creating light strong fi berglass parts mold needs done create shape part soft wood pine fine basswood bet ter Carve shape wood using tem plates guide isnt necessary repli cate exact contour just sure part looks symmetrical shape satis factory seal wood sanding seal er Drill /8-in hole nose other tail support part jig Any type crude jig built house hold lumber pile fine see photos Cover entire mold fiberglass re lease agent available auto supply stores marinas Cut out oversized piece 2-oz glass cloth K&B medium approximately shape fuselage Drape cloth over left-hand side fuselage gently coax hand shape fuselage Mark fiberglass felt-tip marker about /4 % farther around onto right-hand side fuselage continuing way around profile Remove glass cut along line just fin ished marking Put piece glass onto some stiff cardboard transfer shape Cut out cardboard duplicate now pattern producing glass lay ers After much experimentation strongest lightest fuselage obtained cut ting out two left right sides layApril 1990 95 second layer 2-oz cloth draped over entire fuselage underlying layers still wet still wet resin rked second layer Right cured fuselage plug still inside has carefully wet sanded until its perfectly smooth ers entire profile K&B mediumweight cloth approximately 2 oz cloth becomes outside layer make inside nose layer cut out two profiles approximately trailing edge wing forward using K&B heavy cloth ap proximately 6 oz Cut two profiles K&B medium cloth trailing edge wing aft fin allowing some forward overlap inside layer tail boom fin Begin laying up heavier nose layer Dont worry doesnt conform tight nose radiuswell fix later pine nose block Continue wet layup medium-weight glass cloth aft wing position sections secure drape full-length piece over first layers dab dry brush against glass bring resin surface wetting outside layer thoroughly Try get outside layer thoroughly wet using ad ditional resin cup since will have sanded off later Allow resin cure thoroughly remove glass-wrapped plug fixture Take slop sink basement dont have slop sink dont have basement call self modeler start wet sanding fuselage its still plug Continue sanding until youre happy finish Dont prime fuselage sandable primer unless want sand off tween coats primer does highlight holes lumps very well its also very heavy Once finish acceptable apply three four layers masking tape along entire bottom centerline fuselage length Remove reusable plug cutting through fuselage along maskingtape guideline fine-toothed X-Acto saw Dont worry about scratching up plug sawing Its outside fi berglass outside plug needs smooth nice finish After 13 fuselages plug looks like heck still produces nice parts Once have sawn through entire bottom glass fuselage begin prying off plug plug properly waxed will separate easily glass should able quickly extract plug 96 Model Aviation through bottom fuselage min imal effort now have choice make must rejoin lower fuselage /2-in strip cloth resin can outside sanding smooth after curing can proceed lay out cut off canopy rejoin lower fuselage inside Believe doing inside isnt easy Reaching down long narrow tail boom place cloth resin difficult though its cer tainly possible experienced glass work Glue fin tail post once canopy has cut off Let say few words about compat ibility glues fiberglass used polyester resin lay up fuselage must use glue well Five-minute ep oxy wont stick well polyester no matter clean roughed up surface ever used epoxy resin laminate standard epoxy glue may used sure though clean mating surfaces thoroughly alcohol thinner rough up glass bit use CyA cyanoacrylate glues Continued page 101 Left This photo shows bottom seam Carefully apply five six layers masking tape along side seam act guide X-Acto saw seen photo right Right saw used split entire bottom fuselage open sort like gutting fish Left After complete incision has made fuselage plug may extracted glass fuselage pulling fin seen photo Right fuselage plug bottom completely removed new glass fuselage plug can used over over again Left area cutting out canopy masked off Note hole fuselage just aft canopy 3A-in steel wing rod Right canopy has cut out using X-Acto saw photo Stiffeners must now installed canopy fuselage bonding anything fiberglass Although bond feels strong tension glue cannot take shearing forces produced fuselage flexes encounters sudden impact hard landing RTV silicon glues make good alterna tive regardless type resin used overnight cure types such Dow Cornings 3145 high-strength/high-tempera ture silicon glue/sealant work best can found good electrical supply house Again no matter what glue use absolutely certain release agent has removed mating surfaces inside fuselage Sand down fiberglass nose un til clean cross section obtained Cut small block pine approximate shape nose glue fuse lage Sand shape making sure nose radius too sharp Cut out glue canopy area stiffen ers %-in balsa A1 ply doublers fuselage cut out glue stiffeners canopy itself Glue %2 ply inner liner side inside wall fin halves assuring %2-in gap between two liners %2 ply blade glued stabilator will slide pivot Install two Sullivan light cables sheaths aft fuselage time point another decision must made want one-piece airplane plug-in wings one-piece wing mark fuselage conform chosen airfoil cut away necessary fiberglass Set fuse lage aside until final assembly plug-in wings position firmly ep oxy 3/6-OD brass aluminum wing rod place set fuselage aside until final assembly Wings Basic top bottom spar construc tion used save weight upper leading edge sheeted Choose airfoils shown plan cut 26 iden tical ribs Construct outer panels first building right over plan per standard proce dure Pin ribs place add leading trailing edge stock install top spar Add leading edge sheeting re move wing plan install lower spar Though dont think shear webs nec essary outer panel conservative types may want add now stall wing tip blocks sand shape inner panel built much same way few exceptions out board rib must canted match out board section correct dihedral angle first three ribs must notched ac cept one-piece wing dihedral spar subspar tube mount plug-in wings youre building one-piece wing glue one-piece spar inboard pan nels Join two inboard halves checking dihedral correct Fill space beApril 1990 101 side view shows fiberglass f builtup rudder airfoiled stabilator Note early smaller version rud der proved inefficient larger efficient rudder shown plans horizontal tail sitting atop fiberglass fin stabilator can built flat airfoil author believes Glider performs better airfoiled configuration An end view down-turned carved Hoerner wing tip blocks Hoerner wing tip designed minimize air flow turbulence across end wing enhancing efficiency Continued page 102 downward turning wing tip seen trailing edge shot outer left wing pan el Note no shear webbing outer panel can however added makes comfortable Bear mind extra strength translates extra weight CONSORTIUM TOM HUNT 60 HAND LAUNCHED/SMAIF HIGH SA SAILPLANE IDHT 4 - 20 OZALL FLYINT IFABILYZEP wIND AREA 345 5015 /B PLYWOOD TAK PIVOT SUPPORT FLALNEI BRASS TUBE ROD AIFATNY TO IF OR STAB Il-IF INSIDE LIFICAL WITH -e BRASS KBE RYDER RAZOR SAW CANOPY EPON FYSIFACE/0-SI INBO PANFY ONLY RIFT GRADE PUOCERTEIF VA TOE SERVOS /32 PREP SYT REMOVED FROM iLlS SIDE FUR CLARIFY YB BALSA- /04 CANOPY STTFFENRT I/B 1 4 SPREE SPARS PPER YIF LOWER / A RIBS tween wings solid block soft balsa sand airfoil shape youre building two-piece plug-in wing glue A-in Lite Ply tube mount subspar both inboard sections point brass wing tube must installed Clear root rib tube will rest just under bottom top spar second rib should cleared middle third rib cleared just above top bottom spar will achieve maxi mum dihedral angle possible whatever airfoil have chosen Insert tube epoxy liberally A-in Lite Ply tube mount joining upper lower spars Add wing root filler block Sand block airfoil shape carve fit fuselage upon assembly Add 1/6-dia pin leading trailing edge secure incidence angle plugged fuselage Join inboard sections outboard panels using A-in Lite Ply dihe dral brace spar trailing edge Horizontal tail favor slab tails ease construction ignore airfoil shape shown plan believe airfoiled tails make better con trol proceed following steps Build tail building 3R-in-thick slab tail right over plan tail dry cut out two plywood templates airfoil shape tack glue onto tip caps Sand tail using long sanding block 120-grit paper thing rougher may snap ribs Cut out slot horizontal tail center line accept %2 ply blade pivot Drill A-in-dia hole Y32 ply pivot insert A-in-ID brass tube hole sand flush blade Cover tail blade favorite heat shrink ma terial Rudder Like horizontal tail rudder can probably built out scrap box Build slab sided over plan glue dry remove rudder plan sand wedge shape Bevel leading edge side onlya minimum 300 produces proper deflec tion installed one-sided bevel al lows surface hinge rudder tape trim MonoKote side fin giving effective rudder control Assembly Drill hole fin throug] glass cloth %2 ply liners th horizontal tail pivot Insert A-in-ID brass tube gluing securely Remove th section tube slot created tw /32 ply liners Insert horizontal tail bladi slot line up holes Place %2-dia brass pin pivot holes t check alignment freedom move ment Lightly sand away part binds making one-piece-wing version sert wing through opening fu selage checking alignment mci dence Sand fuselage necessary en sure good fit straightness Workinj through canopy opening glue winj fuselage using five-minute epox mixed microballoons plug-in version needs t done carve out inboard fille block fits fuselage snugly youre much carver isnt neces sary achieve exact fit just get Continued page 10 102 Model Aviation /025FY IF p e possible Wax outside fuselage area airfoil Apply mixture ep oxy microballoons roughly carved block Insert wing onto wing rod push against waxed fuselage epoxy thoroughly dry remove wing sand off excess epoxy slurry Install radio gear using positions shown plan guide cable tachment leading edge stabila tor can simple small piece brass tubing squashed flat soldered end cable Drill hole size small nail brad through flattened brass tube Insert nail through tube leading edge block tail Should hole balsa tail become sloppy simply remove nail wet hole thin CyA glue will close hole slightly regain tight fit After epoxying /6 wire tow hook place youre ready paint fuselage minimize weightremember paint heavyuse light primer coat choose dark color will cover two coats Assemble rudder fin using method described earlier Balancing aircraft should done moving radio around adding lead final balance point will estab lished flight testing start center-of-gravity shown plans regard less what airfoil chose Flying Try find helper make first few hand launches way some thing should out trim can sticks right away must admit lack finger hole makes difficult hand launch Glider forcefully grabbing just forward wing leading edge using javelin-type toss Im able get up 50-75 ft consistently Consortium very reliable performer off small high-start towline fact longest flights excess 45 mm have sort rather hand launches blame environment airplane Because models low weight short powerful 16 tubing larger ballfield type high-starts recommended act like slingshots highstarts airplane doesnt weigh enough keep parachute closed premature release almost inevitable parachute removed replaced streamer airplane has tendency overfly launch ring rubber about half expended best type high-start model made 35-50 ft 4-in-dia rubber whatever length string field dimensions will permit consistently get 200-ft-altitude launches windless days SOft rub ber 200 ft line slightest breeze can get over stake still stretching rubber slightly Using M-45 propeller airfoil Consor tium has good speed range stall predictable model requires Continued page 184 104 Model Aviation Left shot plug-in wings shows aluminum tubing epoxied place between spars first two bays left wing Wedg ing tube between spars assures correct dihedral Right mixture epoxy microballoons applied over crudely carved root blocks fuselage thoroughly waxed contact area prior pressing wings against sides create perfect mating surface photo shows wings pressed up against fuselage before epoxy begins set must make final incidence other alignment adjustments before epoxy hardens ne wings separated fuselage after epoxy completely cured ex posing formed mating surface Sand root block remove excess material fairs smoothly wings airfoil 3 New ARFs ZMP MONARCH AMA Sport Pattern span 66 area 750 sq motor 4 stroke 90 60 cu Preassembled balsa fuselage vdneered wing shaped balsa pail Lesan canopy epoxy cowl illustrated assembly manual c ZIMPRO MARKETING Pu suuJoltouKxIoGtTS3PSJO PiJOSE 51 axstex found didnt fly well rea son Extra damping quick control re sponse needed tame RC Helicopters much difficult fly full-size counterparts flybarless RC Helicopters depend stiff main rotor head improve vehicles pitch roll damping control power four-bladed hingeless head shown pictures made stacking two Baron 3OMX two-bladed hingeless heads result similar full-size Westland Lynx rotor head steel flexbeam hub gives comparable flap flexibil ity other type hingeless head BO-105 made MBB acquires its flap flexibility through fiberglass blades Wik Modelle also produces BO-105 hingeless hub blades As heads better depends whether youre talk ing Germans British original-design bearingless rotor head uses flexbeam provide bending torsion Its machined special petroleum-based synthetic called Torlon Manufactured Amoco Petroleum Prod ucts Torlon has properties steel costs about 100 times 2-ft-sq piece sells around $700 aluminum post can added top head support flybar shown pic tures friend Joe Medrano expert sheet metalist machined number rotor Sachs Doimar Engines New Torque Customized TG Only 100% SACHS Engine 27All Engines Complete $360 NNothing Buy 31See us 100 TOLEDO Show *40000 37 *43000 42 $46000 add $50 throttlecoupled spark advance Along 27 8 32 lightweight spring start flywheel-type Sachs Dolmar Engine TG MFG 201427-3845 857 HIgh Mtn Rd N Haledon NJ 07508 heads shown photos stamped own Cobra side frames welded rear exhaust muffler Thank Joe Next months sequel will present -scale four-bladed bearingless model ro tor tested Glenn L Martin wind tun nel University Maryland Along million-dollar tunnel youll see some exotic blades swashplates miniature hydraulic servo actuators control sys tems Consortium/Hunt Continued page 104 slight down elevator pick up hold some speed chasing next thermal Ron Farkas built model Ep pIer 201 airfoil its higher weight 3 oz heavier thinner wing version flies just well higher speed Oth ers made Clark Y RAF 32 Ep pIer 193 airfoils scheduled flown soon after article submitted As builder get bored very easily same old construction techniques same old low-wing sport high-wing trainer airplanes Im hobby learn well have fun certainly did both designing Consortium hope reading about project has acquaint ed some new techniques build ing designing model airplanes youve got urge try something differentand little time spend workshopthis classy-looking good-per forming Sailplane will give lot fun small flying field RC Soaring/Blakeslee Continued page 43 museum its displays programs will knock out Make effort joinor visit join t guarantee youll regret either address National Soaring Museum RD#3 Har ris Hill Elmira NY 14903 Thanks Cal Weiss taking time tell us about NSM Im sure model Glider fliers appreciate learning about will plan stop area tn cover letter Cal mentioned tht photos prt vided Shirley Sliwa Director NSM C also passed along personal information am retired NASA Lewis Researe Center Cleveland last 22 3 years directed work Educ tional Services Office Several notable moc elers Chet Lanzo Warren Plohr Reich brothers see Warren occasion club fieldI am member America Airlines Model Club Chet course just rc cently passed away Way back membe Board NAR along John Worth kind establishes Ive fiel bit time fact know few real pros should add fly almost week Jo Elgin designer Playboy makes no bet ter flier models t have active witl RC Gliders five years am having ball managed 1 hr. 15 mm flight oh Windrifter summer Lord t t did kept pulling up kept trying keep sight reasonable alti tude tm interested areas aviation top soaring tt has always fascinated mt just because beauty carries over intc modeling Scale look beauty RC Sailplane much like real thing anything dont like its beautiful Seal model Cub flies what appears super sonic speeds wife also loves sailplanes ant together have attended several Nationals ant regional contests spectators fact las visit museum dedication thi same time Region 3 contest Harris Hill 1 guess natural believi other Sailplane modelers also interested thi full-size ones museum Its reasot put article together Perhaps some mod elers within reach museum will make ths effort visit live too far away perhaps article will interest may wish become members event atr turned want pass information tc others International Postal Challenge Old-time readers column will remember previous re ports Kale Harden Palm Harbor FL IPC idea behind postal contest club several countries fly same contest same day compare results mail sure its interesting fun-fly con cept way meet Sailplaners other countries Kale Pelicans Club St Pete sent reContinued page J& 184 Model Aviation Special Introductory Offer SUKHOI Su-26M15 ScaleIMPALA Masters Pattern span 68 area 890 sq motor 4 stroke 120 equivspan 68 area 800 sq motor 4 stroke 120 60 rear Preassembled lightweight epoxy fuselage sheeted plug-in wingsPreassembled balsa fusefage veneered plug-in wings & stabs sheeted stab fin & rudder 8 dia epoxy cowl Lexan canopy &Epoxy cowl pipe cover removable canopy Illustrated illustrated assembly manualassembly manual see hobby dealer order direct
Edition: Model Aviation - 1990/04
Page Numbers: 93, 94, 95, 96, 101, 102, 104, 184
IT WAS CASE lunchtime hying squeeze As company work has ex panded lunchtime flying field has shrinking around writing di mensions field approximately 150 yards square down nearly 400 yards square tremendous loss area already prompted elimination RC aircraft over 20 cu knew something needed done efficiently safely utilize what left field have al ways liked idea flying Gliders lunchtime Theyre clean require less field support equipment no big heavy field box did some research small Hand-Launched RC Glider kits cur rently available didnt find anything really grabbed aesthetically short jump decision de sign own Consortium began take shape decided design requirements built one-piece wing aircraft fit easily small Toyota liftback made plug-in wings would have strong enough take standard high-start tow load fuselage look sexyno slab sides Strong Top Consortium flight what looks promising inermai weather 15-meter Sail plane looks flies much like larger counterparts Above author launching M-45 airfoil-equipped version Vermont Mountain Retreat small high-start launched Glider high enough go thermal hunting over thickly wooded slope background April 1990 93 Ron Farkas launching Eppler 201 airfoilThis Consortium built authors friend Ron Farkas Its equipped Epplerequipped Glider high-start struc 201 airfoIl giving thinner wing making slightly heavier about three ounces thantures background give some idea authors prototype thin-winged version flies just well considerably fasterthe limited size lunchtime flying field 3 1 Consortium flying past expanded office building complex spawned idea developina small multifunction Glider may tight squeeze fits Ron Farkas Glider seen its 225-mAh battery pack standard Futaba servos hidden under wing rather large Futaba rkrn kIte stiffeners around Fuselage cutout upside-down canopy Lonsortlum crew right left Bob Aberle Ron Farkas Howie Applegate Tom Hunt Hank Stumpf Nick Dannendorfer Other Consortium builders pi include Paul Bell George Myers Scott Conover Bob Roth Jr Phil John Kicisler Ron Zulow Phil Kielsier recently finished flew Clark V-equipped Consortium its understood RAF 32 Eppler 193 airfoil-equipped versions would soon flying 94 Model Aviation T-tail looks performance out harms way launching landing Rudder/elevator control keep sim ple variants include coupled ai leron rudder Finally aircraft should have lightweight structure good performance design emerged 60-in-span built-up constant-chord polyhedral wing Wing area 345 sq Building shapely non-slab-sided fuselage out balsa would have added too much weight fiberglass construction chosen later Control provided constant-chord stabilator top molded-in fin/fuse lage adjoining rudder Though may seem rather bulbous some tastes fuselage proportioned permit use standard-size radio gear use 225or 100-mAh receiver pack total weight may little what youd get mis stage heavy 6-az cloth draped over nose section uru oca 1fle trailing edge forward nose Apply resin nerously Right photo 2-oz cloth has applied wing trailing edge point aft fin plus some forward overlap systems offer just miniservos standard-size receiver Total weight odel should between 14 20 ounces Something told project ing popular fellow ers Sure enough no sooner showed ound some first draft plans men ned fuselage would fiberglass dreaded words isiness heard want So offered produce fuselages ub members no cost expected return told airplane built just collect dust base ent also expected posed photographs builders models near pressmefinished Thoughts lunchtime Precision Dura contests soon followed builder iould vary basic design choos g own airfoil could irfoils shown plans another wn choice Construction uselage Fiberglass construction tends care lot people away especially must done scratch case scratch means creating master out some easily workable material bass wood foam Prepare master release agent Position jig half ex posed begin heavy glass layup exposed surface produce female mold half fuselage Allow first half cure flip over master re peat process other half Use medium-weight glass lay up fuse lage molds Join two halves theyre still wet molds After final curing sepa rate molds sand edges newly formed fuselage Whew Youve fi nally got something can attach wings tail Its lot work fuselage unless Consortium will also club venture Keep mind smoother accurate master better mold However theres easierand equally sat isfyingway creating light strong fi berglass parts mold needs done create shape part soft wood pine fine basswood bet ter Carve shape wood using tem plates guide isnt necessary repli cate exact contour just sure part looks symmetrical shape satis factory seal wood sanding seal er Drill /8-in hole nose other tail support part jig Any type crude jig built house hold lumber pile fine see photos Cover entire mold fiberglass re lease agent available auto supply stores marinas Cut out oversized piece 2-oz glass cloth K&B medium approximately shape fuselage Drape cloth over left-hand side fuselage gently coax hand shape fuselage Mark fiberglass felt-tip marker about /4 % farther around onto right-hand side fuselage continuing way around profile Remove glass cut along line just fin ished marking Put piece glass onto some stiff cardboard transfer shape Cut out cardboard duplicate now pattern producing glass lay ers After much experimentation strongest lightest fuselage obtained cut ting out two left right sides layApril 1990 95 second layer 2-oz cloth draped over entire fuselage underlying layers still wet still wet resin rked second layer Right cured fuselage plug still inside has carefully wet sanded until its perfectly smooth ers entire profile K&B mediumweight cloth approximately 2 oz cloth becomes outside layer make inside nose layer cut out two profiles approximately trailing edge wing forward using K&B heavy cloth ap proximately 6 oz Cut two profiles K&B medium cloth trailing edge wing aft fin allowing some forward overlap inside layer tail boom fin Begin laying up heavier nose layer Dont worry doesnt conform tight nose radiuswell fix later pine nose block Continue wet layup medium-weight glass cloth aft wing position sections secure drape full-length piece over first layers dab dry brush against glass bring resin surface wetting outside layer thoroughly Try get outside layer thoroughly wet using ad ditional resin cup since will have sanded off later Allow resin cure thoroughly remove glass-wrapped plug fixture Take slop sink basement dont have slop sink dont have basement call self modeler start wet sanding fuselage its still plug Continue sanding until youre happy finish Dont prime fuselage sandable primer unless want sand off tween coats primer does highlight holes lumps very well its also very heavy Once finish acceptable apply three four layers masking tape along entire bottom centerline fuselage length Remove reusable plug cutting through fuselage along maskingtape guideline fine-toothed X-Acto saw Dont worry about scratching up plug sawing Its outside fi berglass outside plug needs smooth nice finish After 13 fuselages plug looks like heck still produces nice parts Once have sawn through entire bottom glass fuselage begin prying off plug plug properly waxed will separate easily glass should able quickly extract plug 96 Model Aviation through bottom fuselage min imal effort now have choice make must rejoin lower fuselage /2-in strip cloth resin can outside sanding smooth after curing can proceed lay out cut off canopy rejoin lower fuselage inside Believe doing inside isnt easy Reaching down long narrow tail boom place cloth resin difficult though its cer tainly possible experienced glass work Glue fin tail post once canopy has cut off Let say few words about compat ibility glues fiberglass used polyester resin lay up fuselage must use glue well Five-minute ep oxy wont stick well polyester no matter clean roughed up surface ever used epoxy resin laminate standard epoxy glue may used sure though clean mating surfaces thoroughly alcohol thinner rough up glass bit use CyA cyanoacrylate glues Continued page 101 Left This photo shows bottom seam Carefully apply five six layers masking tape along side seam act guide X-Acto saw seen photo right Right saw used split entire bottom fuselage open sort like gutting fish Left After complete incision has made fuselage plug may extracted glass fuselage pulling fin seen photo Right fuselage plug bottom completely removed new glass fuselage plug can used over over again Left area cutting out canopy masked off Note hole fuselage just aft canopy 3A-in steel wing rod Right canopy has cut out using X-Acto saw photo Stiffeners must now installed canopy fuselage bonding anything fiberglass Although bond feels strong tension glue cannot take shearing forces produced fuselage flexes encounters sudden impact hard landing RTV silicon glues make good alterna tive regardless type resin used overnight cure types such Dow Cornings 3145 high-strength/high-tempera ture silicon glue/sealant work best can found good electrical supply house Again no matter what glue use absolutely certain release agent has removed mating surfaces inside fuselage Sand down fiberglass nose un til clean cross section obtained Cut small block pine approximate shape nose glue fuse lage Sand shape making sure nose radius too sharp Cut out glue canopy area stiffen ers %-in balsa A1 ply doublers fuselage cut out glue stiffeners canopy itself Glue %2 ply inner liner side inside wall fin halves assuring %2-in gap between two liners %2 ply blade glued stabilator will slide pivot Install two Sullivan light cables sheaths aft fuselage time point another decision must made want one-piece airplane plug-in wings one-piece wing mark fuselage conform chosen airfoil cut away necessary fiberglass Set fuse lage aside until final assembly plug-in wings position firmly ep oxy 3/6-OD brass aluminum wing rod place set fuselage aside until final assembly Wings Basic top bottom spar construc tion used save weight upper leading edge sheeted Choose airfoils shown plan cut 26 iden tical ribs Construct outer panels first building right over plan per standard proce dure Pin ribs place add leading trailing edge stock install top spar Add leading edge sheeting re move wing plan install lower spar Though dont think shear webs nec essary outer panel conservative types may want add now stall wing tip blocks sand shape inner panel built much same way few exceptions out board rib must canted match out board section correct dihedral angle first three ribs must notched ac cept one-piece wing dihedral spar subspar tube mount plug-in wings youre building one-piece wing glue one-piece spar inboard pan nels Join two inboard halves checking dihedral correct Fill space beApril 1990 101 side view shows fiberglass f builtup rudder airfoiled stabilator Note early smaller version rud der proved inefficient larger efficient rudder shown plans horizontal tail sitting atop fiberglass fin stabilator can built flat airfoil author believes Glider performs better airfoiled configuration An end view down-turned carved Hoerner wing tip blocks Hoerner wing tip designed minimize air flow turbulence across end wing enhancing efficiency Continued page 102 downward turning wing tip seen trailing edge shot outer left wing pan el Note no shear webbing outer panel can however added makes comfortable Bear mind extra strength translates extra weight CONSORTIUM TOM HUNT 60 HAND LAUNCHED/SMAIF HIGH SA SAILPLANE IDHT 4 - 20 OZALL FLYINT IFABILYZEP wIND AREA 345 5015 /B PLYWOOD TAK PIVOT SUPPORT FLALNEI BRASS TUBE ROD AIFATNY TO IF OR STAB Il-IF INSIDE LIFICAL WITH -e BRASS KBE RYDER RAZOR SAW CANOPY EPON FYSIFACE/0-SI INBO PANFY ONLY RIFT GRADE PUOCERTEIF VA TOE SERVOS /32 PREP SYT REMOVED FROM iLlS SIDE FUR CLARIFY YB BALSA- /04 CANOPY STTFFENRT I/B 1 4 SPREE SPARS PPER YIF LOWER / A RIBS tween wings solid block soft balsa sand airfoil shape youre building two-piece plug-in wing glue A-in Lite Ply tube mount subspar both inboard sections point brass wing tube must installed Clear root rib tube will rest just under bottom top spar second rib should cleared middle third rib cleared just above top bottom spar will achieve maxi mum dihedral angle possible whatever airfoil have chosen Insert tube epoxy liberally A-in Lite Ply tube mount joining upper lower spars Add wing root filler block Sand block airfoil shape carve fit fuselage upon assembly Add 1/6-dia pin leading trailing edge secure incidence angle plugged fuselage Join inboard sections outboard panels using A-in Lite Ply dihe dral brace spar trailing edge Horizontal tail favor slab tails ease construction ignore airfoil shape shown plan believe airfoiled tails make better con trol proceed following steps Build tail building 3R-in-thick slab tail right over plan tail dry cut out two plywood templates airfoil shape tack glue onto tip caps Sand tail using long sanding block 120-grit paper thing rougher may snap ribs Cut out slot horizontal tail center line accept %2 ply blade pivot Drill A-in-dia hole Y32 ply pivot insert A-in-ID brass tube hole sand flush blade Cover tail blade favorite heat shrink ma terial Rudder Like horizontal tail rudder can probably built out scrap box Build slab sided over plan glue dry remove rudder plan sand wedge shape Bevel leading edge side onlya minimum 300 produces proper deflec tion installed one-sided bevel al lows surface hinge rudder tape trim MonoKote side fin giving effective rudder control Assembly Drill hole fin throug] glass cloth %2 ply liners th horizontal tail pivot Insert A-in-ID brass tube gluing securely Remove th section tube slot created tw /32 ply liners Insert horizontal tail bladi slot line up holes Place %2-dia brass pin pivot holes t check alignment freedom move ment Lightly sand away part binds making one-piece-wing version sert wing through opening fu selage checking alignment mci dence Sand fuselage necessary en sure good fit straightness Workinj through canopy opening glue winj fuselage using five-minute epox mixed microballoons plug-in version needs t done carve out inboard fille block fits fuselage snugly youre much carver isnt neces sary achieve exact fit just get Continued page 10 102 Model Aviation /025FY IF p e possible Wax outside fuselage area airfoil Apply mixture ep oxy microballoons roughly carved block Insert wing onto wing rod push against waxed fuselage epoxy thoroughly dry remove wing sand off excess epoxy slurry Install radio gear using positions shown plan guide cable tachment leading edge stabila tor can simple small piece brass tubing squashed flat soldered end cable Drill hole size small nail brad through flattened brass tube Insert nail through tube leading edge block tail Should hole balsa tail become sloppy simply remove nail wet hole thin CyA glue will close hole slightly regain tight fit After epoxying /6 wire tow hook place youre ready paint fuselage minimize weightremember paint heavyuse light primer coat choose dark color will cover two coats Assemble rudder fin using method described earlier Balancing aircraft should done moving radio around adding lead final balance point will estab lished flight testing start center-of-gravity shown plans regard less what airfoil chose Flying Try find helper make first few hand launches way some thing should out trim can sticks right away must admit lack finger hole makes difficult hand launch Glider forcefully grabbing just forward wing leading edge using javelin-type toss Im able get up 50-75 ft consistently Consortium very reliable performer off small high-start towline fact longest flights excess 45 mm have sort rather hand launches blame environment airplane Because models low weight short powerful 16 tubing larger ballfield type high-starts recommended act like slingshots highstarts airplane doesnt weigh enough keep parachute closed premature release almost inevitable parachute removed replaced streamer airplane has tendency overfly launch ring rubber about half expended best type high-start model made 35-50 ft 4-in-dia rubber whatever length string field dimensions will permit consistently get 200-ft-altitude launches windless days SOft rub ber 200 ft line slightest breeze can get over stake still stretching rubber slightly Using M-45 propeller airfoil Consor tium has good speed range stall predictable model requires Continued page 184 104 Model Aviation Left shot plug-in wings shows aluminum tubing epoxied place between spars first two bays left wing Wedg ing tube between spars assures correct dihedral Right mixture epoxy microballoons applied over crudely carved root blocks fuselage thoroughly waxed contact area prior pressing wings against sides create perfect mating surface photo shows wings pressed up against fuselage before epoxy begins set must make final incidence other alignment adjustments before epoxy hardens ne wings separated fuselage after epoxy completely cured ex posing formed mating surface Sand root block remove excess material fairs smoothly wings airfoil 3 New ARFs ZMP MONARCH AMA Sport Pattern span 66 area 750 sq motor 4 stroke 90 60 cu Preassembled balsa fuselage vdneered wing shaped balsa pail Lesan canopy epoxy cowl illustrated assembly manual c ZIMPRO MARKETING Pu suuJoltouKxIoGtTS3PSJO PiJOSE 51 axstex found didnt fly well rea son Extra damping quick control re sponse needed tame RC Helicopters much difficult fly full-size counterparts flybarless RC Helicopters depend stiff main rotor head improve vehicles pitch roll damping control power four-bladed hingeless head shown pictures made stacking two Baron 3OMX two-bladed hingeless heads result similar full-size Westland Lynx rotor head steel flexbeam hub gives comparable flap flexibil ity other type hingeless head BO-105 made MBB acquires its flap flexibility through fiberglass blades Wik Modelle also produces BO-105 hingeless hub blades As heads better depends whether youre talk ing Germans British original-design bearingless rotor head uses flexbeam provide bending torsion Its machined special petroleum-based synthetic called Torlon Manufactured Amoco Petroleum Prod ucts Torlon has properties steel costs about 100 times 2-ft-sq piece sells around $700 aluminum post can added top head support flybar shown pic tures friend Joe Medrano expert sheet metalist machined number rotor Sachs Doimar Engines New Torque Customized TG Only 100% SACHS Engine 27All Engines Complete $360 NNothing Buy 31See us 100 TOLEDO Show *40000 37 *43000 42 $46000 add $50 throttlecoupled spark advance Along 27 8 32 lightweight spring start flywheel-type Sachs Dolmar Engine TG MFG 201427-3845 857 HIgh Mtn Rd N Haledon NJ 07508 heads shown photos stamped own Cobra side frames welded rear exhaust muffler Thank Joe Next months sequel will present -scale four-bladed bearingless model ro tor tested Glenn L Martin wind tun nel University Maryland Along million-dollar tunnel youll see some exotic blades swashplates miniature hydraulic servo actuators control sys tems Consortium/Hunt Continued page 104 slight down elevator pick up hold some speed chasing next thermal Ron Farkas built model Ep pIer 201 airfoil its higher weight 3 oz heavier thinner wing version flies just well higher speed Oth ers made Clark Y RAF 32 Ep pIer 193 airfoils scheduled flown soon after article submitted As builder get bored very easily same old construction techniques same old low-wing sport high-wing trainer airplanes Im hobby learn well have fun certainly did both designing Consortium hope reading about project has acquaint ed some new techniques build ing designing model airplanes youve got urge try something differentand little time spend workshopthis classy-looking good-per forming Sailplane will give lot fun small flying field RC Soaring/Blakeslee Continued page 43 museum its displays programs will knock out Make effort joinor visit join t guarantee youll regret either address National Soaring Museum RD#3 Har ris Hill Elmira NY 14903 Thanks Cal Weiss taking time tell us about NSM Im sure model Glider fliers appreciate learning about will plan stop area tn cover letter Cal mentioned tht photos prt vided Shirley Sliwa Director NSM C also passed along personal information am retired NASA Lewis Researe Center Cleveland last 22 3 years directed work Educ tional Services Office Several notable moc elers Chet Lanzo Warren Plohr Reich brothers see Warren occasion club fieldI am member America Airlines Model Club Chet course just rc cently passed away Way back membe Board NAR along John Worth kind establishes Ive fiel bit time fact know few real pros should add fly almost week Jo Elgin designer Playboy makes no bet ter flier models t have active witl RC Gliders five years am having ball managed 1 hr. 15 mm flight oh Windrifter summer Lord t t did kept pulling up kept trying keep sight reasonable alti tude tm interested areas aviation top soaring tt has always fascinated mt just because beauty carries over intc modeling Scale look beauty RC Sailplane much like real thing anything dont like its beautiful Seal model Cub flies what appears super sonic speeds wife also loves sailplanes ant together have attended several Nationals ant regional contests spectators fact las visit museum dedication thi same time Region 3 contest Harris Hill 1 guess natural believi other Sailplane modelers also interested thi full-size ones museum Its reasot put article together Perhaps some mod elers within reach museum will make ths effort visit live too far away perhaps article will interest may wish become members event atr turned want pass information tc others International Postal Challenge Old-time readers column will remember previous re ports Kale Harden Palm Harbor FL IPC idea behind postal contest club several countries fly same contest same day compare results mail sure its interesting fun-fly con cept way meet Sailplaners other countries Kale Pelicans Club St Pete sent reContinued page J& 184 Model Aviation Special Introductory Offer SUKHOI Su-26M15 ScaleIMPALA Masters Pattern span 68 area 890 sq motor 4 stroke 120 equivspan 68 area 800 sq motor 4 stroke 120 60 rear Preassembled lightweight epoxy fuselage sheeted plug-in wingsPreassembled balsa fusefage veneered plug-in wings & stabs sheeted stab fin & rudder 8 dia epoxy cowl Lexan canopy &Epoxy cowl pipe cover removable canopy Illustrated illustrated assembly manualassembly manual see hobby dealer order direct
Edition: Model Aviation - 1990/04
Page Numbers: 93, 94, 95, 96, 101, 102, 104, 184
IT WAS CASE lunchtime hying squeeze As company work has ex panded lunchtime flying field has shrinking around writing di mensions field approximately 150 yards square down nearly 400 yards square tremendous loss area already prompted elimination RC aircraft over 20 cu knew something needed done efficiently safely utilize what left field have al ways liked idea flying Gliders lunchtime Theyre clean require less field support equipment no big heavy field box did some research small Hand-Launched RC Glider kits cur rently available didnt find anything really grabbed aesthetically short jump decision de sign own Consortium began take shape decided design requirements built one-piece wing aircraft fit easily small Toyota liftback made plug-in wings would have strong enough take standard high-start tow load fuselage look sexyno slab sides Strong Top Consortium flight what looks promising inermai weather 15-meter Sail plane looks flies much like larger counterparts Above author launching M-45 airfoil-equipped version Vermont Mountain Retreat small high-start launched Glider high enough go thermal hunting over thickly wooded slope background April 1990 93 Ron Farkas launching Eppler 201 airfoilThis Consortium built authors friend Ron Farkas Its equipped Epplerequipped Glider high-start struc 201 airfoIl giving thinner wing making slightly heavier about three ounces thantures background give some idea authors prototype thin-winged version flies just well considerably fasterthe limited size lunchtime flying field 3 1 Consortium flying past expanded office building complex spawned idea developina small multifunction Glider may tight squeeze fits Ron Farkas Glider seen its 225-mAh battery pack standard Futaba servos hidden under wing rather large Futaba rkrn kIte stiffeners around Fuselage cutout upside-down canopy Lonsortlum crew right left Bob Aberle Ron Farkas Howie Applegate Tom Hunt Hank Stumpf Nick Dannendorfer Other Consortium builders pi include Paul Bell George Myers Scott Conover Bob Roth Jr Phil John Kicisler Ron Zulow Phil Kielsier recently finished flew Clark V-equipped Consortium its understood RAF 32 Eppler 193 airfoil-equipped versions would soon flying 94 Model Aviation T-tail looks performance out harms way launching landing Rudder/elevator control keep sim ple variants include coupled ai leron rudder Finally aircraft should have lightweight structure good performance design emerged 60-in-span built-up constant-chord polyhedral wing Wing area 345 sq Building shapely non-slab-sided fuselage out balsa would have added too much weight fiberglass construction chosen later Control provided constant-chord stabilator top molded-in fin/fuse lage adjoining rudder Though may seem rather bulbous some tastes fuselage proportioned permit use standard-size radio gear use 225or 100-mAh receiver pack total weight may little what youd get mis stage heavy 6-az cloth draped over nose section uru oca 1fle trailing edge forward nose Apply resin nerously Right photo 2-oz cloth has applied wing trailing edge point aft fin plus some forward overlap systems offer just miniservos standard-size receiver Total weight odel should between 14 20 ounces Something told project ing popular fellow ers Sure enough no sooner showed ound some first draft plans men ned fuselage would fiberglass dreaded words isiness heard want So offered produce fuselages ub members no cost expected return told airplane built just collect dust base ent also expected posed photographs builders models near pressmefinished Thoughts lunchtime Precision Dura contests soon followed builder iould vary basic design choos g own airfoil could irfoils shown plans another wn choice Construction uselage Fiberglass construction tends care lot people away especially must done scratch case scratch means creating master out some easily workable material bass wood foam Prepare master release agent Position jig half ex posed begin heavy glass layup exposed surface produce female mold half fuselage Allow first half cure flip over master re peat process other half Use medium-weight glass lay up fuse lage molds Join two halves theyre still wet molds After final curing sepa rate molds sand edges newly formed fuselage Whew Youve fi nally got something can attach wings tail Its lot work fuselage unless Consortium will also club venture Keep mind smoother accurate master better mold However theres easierand equally sat isfyingway creating light strong fi berglass parts mold needs done create shape part soft wood pine fine basswood bet ter Carve shape wood using tem plates guide isnt necessary repli cate exact contour just sure part looks symmetrical shape satis factory seal wood sanding seal er Drill /8-in hole nose other tail support part jig Any type crude jig built house hold lumber pile fine see photos Cover entire mold fiberglass re lease agent available auto supply stores marinas Cut out oversized piece 2-oz glass cloth K&B medium approximately shape fuselage Drape cloth over left-hand side fuselage gently coax hand shape fuselage Mark fiberglass felt-tip marker about /4 % farther around onto right-hand side fuselage continuing way around profile Remove glass cut along line just fin ished marking Put piece glass onto some stiff cardboard transfer shape Cut out cardboard duplicate now pattern producing glass lay ers After much experimentation strongest lightest fuselage obtained cut ting out two left right sides layApril 1990 95 second layer 2-oz cloth draped over entire fuselage underlying layers still wet still wet resin rked second layer Right cured fuselage plug still inside has carefully wet sanded until its perfectly smooth ers entire profile K&B mediumweight cloth approximately 2 oz cloth becomes outside layer make inside nose layer cut out two profiles approximately trailing edge wing forward using K&B heavy cloth ap proximately 6 oz Cut two profiles K&B medium cloth trailing edge wing aft fin allowing some forward overlap inside layer tail boom fin Begin laying up heavier nose layer Dont worry doesnt conform tight nose radiuswell fix later pine nose block Continue wet layup medium-weight glass cloth aft wing position sections secure drape full-length piece over first layers dab dry brush against glass bring resin surface wetting outside layer thoroughly Try get outside layer thoroughly wet using ad ditional resin cup since will have sanded off later Allow resin cure thoroughly remove glass-wrapped plug fixture Take slop sink basement dont have slop sink dont have basement call self modeler start wet sanding fuselage its still plug Continue sanding until youre happy finish Dont prime fuselage sandable primer unless want sand off tween coats primer does highlight holes lumps very well its also very heavy Once finish acceptable apply three four layers masking tape along entire bottom centerline fuselage length Remove reusable plug cutting through fuselage along maskingtape guideline fine-toothed X-Acto saw Dont worry about scratching up plug sawing Its outside fi berglass outside plug needs smooth nice finish After 13 fuselages plug looks like heck still produces nice parts Once have sawn through entire bottom glass fuselage begin prying off plug plug properly waxed will separate easily glass should able quickly extract plug 96 Model Aviation through bottom fuselage min imal effort now have choice make must rejoin lower fuselage /2-in strip cloth resin can outside sanding smooth after curing can proceed lay out cut off canopy rejoin lower fuselage inside Believe doing inside isnt easy Reaching down long narrow tail boom place cloth resin difficult though its cer tainly possible experienced glass work Glue fin tail post once canopy has cut off Let say few words about compat ibility glues fiberglass used polyester resin lay up fuselage must use glue well Five-minute ep oxy wont stick well polyester no matter clean roughed up surface ever used epoxy resin laminate standard epoxy glue may used sure though clean mating surfaces thoroughly alcohol thinner rough up glass bit use CyA cyanoacrylate glues Continued page 101 Left This photo shows bottom seam Carefully apply five six layers masking tape along side seam act guide X-Acto saw seen photo right Right saw used split entire bottom fuselage open sort like gutting fish Left After complete incision has made fuselage plug may extracted glass fuselage pulling fin seen photo Right fuselage plug bottom completely removed new glass fuselage plug can used over over again Left area cutting out canopy masked off Note hole fuselage just aft canopy 3A-in steel wing rod Right canopy has cut out using X-Acto saw photo Stiffeners must now installed canopy fuselage bonding anything fiberglass Although bond feels strong tension glue cannot take shearing forces produced fuselage flexes encounters sudden impact hard landing RTV silicon glues make good alterna tive regardless type resin used overnight cure types such Dow Cornings 3145 high-strength/high-tempera ture silicon glue/sealant work best can found good electrical supply house Again no matter what glue use absolutely certain release agent has removed mating surfaces inside fuselage Sand down fiberglass nose un til clean cross section obtained Cut small block pine approximate shape nose glue fuse lage Sand shape making sure nose radius too sharp Cut out glue canopy area stiffen ers %-in balsa A1 ply doublers fuselage cut out glue stiffeners canopy itself Glue %2 ply inner liner side inside wall fin halves assuring %2-in gap between two liners %2 ply blade glued stabilator will slide pivot Install two Sullivan light cables sheaths aft fuselage time point another decision must made want one-piece airplane plug-in wings one-piece wing mark fuselage conform chosen airfoil cut away necessary fiberglass Set fuse lage aside until final assembly plug-in wings position firmly ep oxy 3/6-OD brass aluminum wing rod place set fuselage aside until final assembly Wings Basic top bottom spar construc tion used save weight upper leading edge sheeted Choose airfoils shown plan cut 26 iden tical ribs Construct outer panels first building right over plan per standard proce dure Pin ribs place add leading trailing edge stock install top spar Add leading edge sheeting re move wing plan install lower spar Though dont think shear webs nec essary outer panel conservative types may want add now stall wing tip blocks sand shape inner panel built much same way few exceptions out board rib must canted match out board section correct dihedral angle first three ribs must notched ac cept one-piece wing dihedral spar subspar tube mount plug-in wings youre building one-piece wing glue one-piece spar inboard pan nels Join two inboard halves checking dihedral correct Fill space beApril 1990 101 side view shows fiberglass f builtup rudder airfoiled stabilator Note early smaller version rud der proved inefficient larger efficient rudder shown plans horizontal tail sitting atop fiberglass fin stabilator can built flat airfoil author believes Glider performs better airfoiled configuration An end view down-turned carved Hoerner wing tip blocks Hoerner wing tip designed minimize air flow turbulence across end wing enhancing efficiency Continued page 102 downward turning wing tip seen trailing edge shot outer left wing pan el Note no shear webbing outer panel can however added makes comfortable Bear mind extra strength translates extra weight CONSORTIUM TOM HUNT 60 HAND LAUNCHED/SMAIF HIGH SA SAILPLANE IDHT 4 - 20 OZALL FLYINT IFABILYZEP wIND AREA 345 5015 /B PLYWOOD TAK PIVOT SUPPORT FLALNEI BRASS TUBE ROD AIFATNY TO IF OR STAB Il-IF INSIDE LIFICAL WITH -e BRASS KBE RYDER RAZOR SAW CANOPY EPON FYSIFACE/0-SI INBO PANFY ONLY RIFT GRADE PUOCERTEIF VA TOE SERVOS /32 PREP SYT REMOVED FROM iLlS SIDE FUR CLARIFY YB BALSA- /04 CANOPY STTFFENRT I/B 1 4 SPREE SPARS PPER YIF LOWER / A RIBS tween wings solid block soft balsa sand airfoil shape youre building two-piece plug-in wing glue A-in Lite Ply tube mount subspar both inboard sections point brass wing tube must installed Clear root rib tube will rest just under bottom top spar second rib should cleared middle third rib cleared just above top bottom spar will achieve maxi mum dihedral angle possible whatever airfoil have chosen Insert tube epoxy liberally A-in Lite Ply tube mount joining upper lower spars Add wing root filler block Sand block airfoil shape carve fit fuselage upon assembly Add 1/6-dia pin leading trailing edge secure incidence angle plugged fuselage Join inboard sections outboard panels using A-in Lite Ply dihe dral brace spar trailing edge Horizontal tail favor slab tails ease construction ignore airfoil shape shown plan believe airfoiled tails make better con trol proceed following steps Build tail building 3R-in-thick slab tail right over plan tail dry cut out two plywood templates airfoil shape tack glue onto tip caps Sand tail using long sanding block 120-grit paper thing rougher may snap ribs Cut out slot horizontal tail center line accept %2 ply blade pivot Drill A-in-dia hole Y32 ply pivot insert A-in-ID brass tube hole sand flush blade Cover tail blade favorite heat shrink ma terial Rudder Like horizontal tail rudder can probably built out scrap box Build slab sided over plan glue dry remove rudder plan sand wedge shape Bevel leading edge side onlya minimum 300 produces proper deflec tion installed one-sided bevel al lows surface hinge rudder tape trim MonoKote side fin giving effective rudder control Assembly Drill hole fin throug] glass cloth %2 ply liners th horizontal tail pivot Insert A-in-ID brass tube gluing securely Remove th section tube slot created tw /32 ply liners Insert horizontal tail bladi slot line up holes Place %2-dia brass pin pivot holes t check alignment freedom move ment Lightly sand away part binds making one-piece-wing version sert wing through opening fu selage checking alignment mci dence Sand fuselage necessary en sure good fit straightness Workinj through canopy opening glue winj fuselage using five-minute epox mixed microballoons plug-in version needs t done carve out inboard fille block fits fuselage snugly youre much carver isnt neces sary achieve exact fit just get Continued page 10 102 Model Aviation /025FY IF p e possible Wax outside fuselage area airfoil Apply mixture ep oxy microballoons roughly carved block Insert wing onto wing rod push against waxed fuselage epoxy thoroughly dry remove wing sand off excess epoxy slurry Install radio gear using positions shown plan guide cable tachment leading edge stabila tor can simple small piece brass tubing squashed flat soldered end cable Drill hole size small nail brad through flattened brass tube Insert nail through tube leading edge block tail Should hole balsa tail become sloppy simply remove nail wet hole thin CyA glue will close hole slightly regain tight fit After epoxying /6 wire tow hook place youre ready paint fuselage minimize weightremember paint heavyuse light primer coat choose dark color will cover two coats Assemble rudder fin using method described earlier Balancing aircraft should done moving radio around adding lead final balance point will estab lished flight testing start center-of-gravity shown plans regard less what airfoil chose Flying Try find helper make first few hand launches way some thing should out trim can sticks right away must admit lack finger hole makes difficult hand launch Glider forcefully grabbing just forward wing leading edge using javelin-type toss Im able get up 50-75 ft consistently Consortium very reliable performer off small high-start towline fact longest flights excess 45 mm have sort rather hand launches blame environment airplane Because models low weight short powerful 16 tubing larger ballfield type high-starts recommended act like slingshots highstarts airplane doesnt weigh enough keep parachute closed premature release almost inevitable parachute removed replaced streamer airplane has tendency overfly launch ring rubber about half expended best type high-start model made 35-50 ft 4-in-dia rubber whatever length string field dimensions will permit consistently get 200-ft-altitude launches windless days SOft rub ber 200 ft line slightest breeze can get over stake still stretching rubber slightly Using M-45 propeller airfoil Consor tium has good speed range stall predictable model requires Continued page 184 104 Model Aviation Left shot plug-in wings shows aluminum tubing epoxied place between spars first two bays left wing Wedg ing tube between spars assures correct dihedral Right mixture epoxy microballoons applied over crudely carved root blocks fuselage thoroughly waxed contact area prior pressing wings against sides create perfect mating surface photo shows wings pressed up against fuselage before epoxy begins set must make final incidence other alignment adjustments before epoxy hardens ne wings separated fuselage after epoxy completely cured ex posing formed mating surface Sand root block remove excess material fairs smoothly wings airfoil 3 New ARFs ZMP MONARCH AMA Sport Pattern span 66 area 750 sq motor 4 stroke 90 60 cu Preassembled balsa fuselage vdneered wing shaped balsa pail Lesan canopy epoxy cowl illustrated assembly manual c ZIMPRO MARKETING Pu suuJoltouKxIoGtTS3PSJO PiJOSE 51 axstex found didnt fly well rea son Extra damping quick control re sponse needed tame RC Helicopters much difficult fly full-size counterparts flybarless RC Helicopters depend stiff main rotor head improve vehicles pitch roll damping control power four-bladed hingeless head shown pictures made stacking two Baron 3OMX two-bladed hingeless heads result similar full-size Westland Lynx rotor head steel flexbeam hub gives comparable flap flexibil ity other type hingeless head BO-105 made MBB acquires its flap flexibility through fiberglass blades Wik Modelle also produces BO-105 hingeless hub blades As heads better depends whether youre talk ing Germans British original-design bearingless rotor head uses flexbeam provide bending torsion Its machined special petroleum-based synthetic called Torlon Manufactured Amoco Petroleum Prod ucts Torlon has properties steel costs about 100 times 2-ft-sq piece sells around $700 aluminum post can added top head support flybar shown pic tures friend Joe Medrano expert sheet metalist machined number rotor Sachs Doimar Engines New Torque Customized TG Only 100% SACHS Engine 27All Engines Complete $360 NNothing Buy 31See us 100 TOLEDO Show *40000 37 *43000 42 $46000 add $50 throttlecoupled spark advance Along 27 8 32 lightweight spring start flywheel-type Sachs Dolmar Engine TG MFG 201427-3845 857 HIgh Mtn Rd N Haledon NJ 07508 heads shown photos stamped own Cobra side frames welded rear exhaust muffler Thank Joe Next months sequel will present -scale four-bladed bearingless model ro tor tested Glenn L Martin wind tun nel University Maryland Along million-dollar tunnel youll see some exotic blades swashplates miniature hydraulic servo actuators control sys tems Consortium/Hunt Continued page 104 slight down elevator pick up hold some speed chasing next thermal Ron Farkas built model Ep pIer 201 airfoil its higher weight 3 oz heavier thinner wing version flies just well higher speed Oth ers made Clark Y RAF 32 Ep pIer 193 airfoils scheduled flown soon after article submitted As builder get bored very easily same old construction techniques same old low-wing sport high-wing trainer airplanes Im hobby learn well have fun certainly did both designing Consortium hope reading about project has acquaint ed some new techniques build ing designing model airplanes youve got urge try something differentand little time spend workshopthis classy-looking good-per forming Sailplane will give lot fun small flying field RC Soaring/Blakeslee Continued page 43 museum its displays programs will knock out Make effort joinor visit join t guarantee youll regret either address National Soaring Museum RD#3 Har ris Hill Elmira NY 14903 Thanks Cal Weiss taking time tell us about NSM Im sure model Glider fliers appreciate learning about will plan stop area tn cover letter Cal mentioned tht photos prt vided Shirley Sliwa Director NSM C also passed along personal information am retired NASA Lewis Researe Center Cleveland last 22 3 years directed work Educ tional Services Office Several notable moc elers Chet Lanzo Warren Plohr Reich brothers see Warren occasion club fieldI am member America Airlines Model Club Chet course just rc cently passed away Way back membe Board NAR along John Worth kind establishes Ive fiel bit time fact know few real pros should add fly almost week Jo Elgin designer Playboy makes no bet ter flier models t have active witl RC Gliders five years am having ball managed 1 hr. 15 mm flight oh Windrifter summer Lord t t did kept pulling up kept trying keep sight reasonable alti tude tm interested areas aviation top soaring tt has always fascinated mt just because beauty carries over intc modeling Scale look beauty RC Sailplane much like real thing anything dont like its beautiful Seal model Cub flies what appears super sonic speeds wife also loves sailplanes ant together have attended several Nationals ant regional contests spectators fact las visit museum dedication thi same time Region 3 contest Harris Hill 1 guess natural believi other Sailplane modelers also interested thi full-size ones museum Its reasot put article together Perhaps some mod elers within reach museum will make ths effort visit live too far away perhaps article will interest may wish become members event atr turned want pass information tc others International Postal Challenge Old-time readers column will remember previous re ports Kale Harden Palm Harbor FL IPC idea behind postal contest club several countries fly same contest same day compare results mail sure its interesting fun-fly con cept way meet Sailplaners other countries Kale Pelicans Club St Pete sent reContinued page J& 184 Model Aviation Special Introductory Offer SUKHOI Su-26M15 ScaleIMPALA Masters Pattern span 68 area 890 sq motor 4 stroke 120 equivspan 68 area 800 sq motor 4 stroke 120 60 rear Preassembled lightweight epoxy fuselage sheeted plug-in wingsPreassembled balsa fusefage veneered plug-in wings & stabs sheeted stab fin & rudder 8 dia epoxy cowl Lexan canopy &Epoxy cowl pipe cover removable canopy Illustrated illustrated assembly manualassembly manual see hobby dealer order direct
Edition: Model Aviation - 1990/04
Page Numbers: 93, 94, 95, 96, 101, 102, 104, 184
IT WAS CASE lunchtime hying squeeze As company work has ex panded lunchtime flying field has shrinking around writing di mensions field approximately 150 yards square down nearly 400 yards square tremendous loss area already prompted elimination RC aircraft over 20 cu knew something needed done efficiently safely utilize what left field have al ways liked idea flying Gliders lunchtime Theyre clean require less field support equipment no big heavy field box did some research small Hand-Launched RC Glider kits cur rently available didnt find anything really grabbed aesthetically short jump decision de sign own Consortium began take shape decided design requirements built one-piece wing aircraft fit easily small Toyota liftback made plug-in wings would have strong enough take standard high-start tow load fuselage look sexyno slab sides Strong Top Consortium flight what looks promising inermai weather 15-meter Sail plane looks flies much like larger counterparts Above author launching M-45 airfoil-equipped version Vermont Mountain Retreat small high-start launched Glider high enough go thermal hunting over thickly wooded slope background April 1990 93 Ron Farkas launching Eppler 201 airfoilThis Consortium built authors friend Ron Farkas Its equipped Epplerequipped Glider high-start struc 201 airfoIl giving thinner wing making slightly heavier about three ounces thantures background give some idea authors prototype thin-winged version flies just well considerably fasterthe limited size lunchtime flying field 3 1 Consortium flying past expanded office building complex spawned idea developina small multifunction Glider may tight squeeze fits Ron Farkas Glider seen its 225-mAh battery pack standard Futaba servos hidden under wing rather large Futaba rkrn kIte stiffeners around Fuselage cutout upside-down canopy Lonsortlum crew right left Bob Aberle Ron Farkas Howie Applegate Tom Hunt Hank Stumpf Nick Dannendorfer Other Consortium builders pi include Paul Bell George Myers Scott Conover Bob Roth Jr Phil John Kicisler Ron Zulow Phil Kielsier recently finished flew Clark V-equipped Consortium its understood RAF 32 Eppler 193 airfoil-equipped versions would soon flying 94 Model Aviation T-tail looks performance out harms way launching landing Rudder/elevator control keep sim ple variants include coupled ai leron rudder Finally aircraft should have lightweight structure good performance design emerged 60-in-span built-up constant-chord polyhedral wing Wing area 345 sq Building shapely non-slab-sided fuselage out balsa would have added too much weight fiberglass construction chosen later Control provided constant-chord stabilator top molded-in fin/fuse lage adjoining rudder Though may seem rather bulbous some tastes fuselage proportioned permit use standard-size radio gear use 225or 100-mAh receiver pack total weight may little what youd get mis stage heavy 6-az cloth draped over nose section uru oca 1fle trailing edge forward nose Apply resin nerously Right photo 2-oz cloth has applied wing trailing edge point aft fin plus some forward overlap systems offer just miniservos standard-size receiver Total weight odel should between 14 20 ounces Something told project ing popular fellow ers Sure enough no sooner showed ound some first draft plans men ned fuselage would fiberglass dreaded words isiness heard want So offered produce fuselages ub members no cost expected return told airplane built just collect dust base ent also expected posed photographs builders models near pressmefinished Thoughts lunchtime Precision Dura contests soon followed builder iould vary basic design choos g own airfoil could irfoils shown plans another wn choice Construction uselage Fiberglass construction tends care lot people away especially must done scratch case scratch means creating master out some easily workable material bass wood foam Prepare master release agent Position jig half ex posed begin heavy glass layup exposed surface produce female mold half fuselage Allow first half cure flip over master re peat process other half Use medium-weight glass lay up fuse lage molds Join two halves theyre still wet molds After final curing sepa rate molds sand edges newly formed fuselage Whew Youve fi nally got something can attach wings tail Its lot work fuselage unless Consortium will also club venture Keep mind smoother accurate master better mold However theres easierand equally sat isfyingway creating light strong fi berglass parts mold needs done create shape part soft wood pine fine basswood bet ter Carve shape wood using tem plates guide isnt necessary repli cate exact contour just sure part looks symmetrical shape satis factory seal wood sanding seal er Drill /8-in hole nose other tail support part jig Any type crude jig built house hold lumber pile fine see photos Cover entire mold fiberglass re lease agent available auto supply stores marinas Cut out oversized piece 2-oz glass cloth K&B medium approximately shape fuselage Drape cloth over left-hand side fuselage gently coax hand shape fuselage Mark fiberglass felt-tip marker about /4 % farther around onto right-hand side fuselage continuing way around profile Remove glass cut along line just fin ished marking Put piece glass onto some stiff cardboard transfer shape Cut out cardboard duplicate now pattern producing glass lay ers After much experimentation strongest lightest fuselage obtained cut ting out two left right sides layApril 1990 95 second layer 2-oz cloth draped over entire fuselage underlying layers still wet still wet resin rked second layer Right cured fuselage plug still inside has carefully wet sanded until its perfectly smooth ers entire profile K&B mediumweight cloth approximately 2 oz cloth becomes outside layer make inside nose layer cut out two profiles approximately trailing edge wing forward using K&B heavy cloth ap proximately 6 oz Cut two profiles K&B medium cloth trailing edge wing aft fin allowing some forward overlap inside layer tail boom fin Begin laying up heavier nose layer Dont worry doesnt conform tight nose radiuswell fix later pine nose block Continue wet layup medium-weight glass cloth aft wing position sections secure drape full-length piece over first layers dab dry brush against glass bring resin surface wetting outside layer thoroughly Try get outside layer thoroughly wet using ad ditional resin cup since will have sanded off later Allow resin cure thoroughly remove glass-wrapped plug fixture Take slop sink basement dont have slop sink dont have basement call self modeler start wet sanding fuselage its still plug Continue sanding until youre happy finish Dont prime fuselage sandable primer unless want sand off tween coats primer does highlight holes lumps very well its also very heavy Once finish acceptable apply three four layers masking tape along entire bottom centerline fuselage length Remove reusable plug cutting through fuselage along maskingtape guideline fine-toothed X-Acto saw Dont worry about scratching up plug sawing Its outside fi berglass outside plug needs smooth nice finish After 13 fuselages plug looks like heck still produces nice parts Once have sawn through entire bottom glass fuselage begin prying off plug plug properly waxed will separate easily glass should able quickly extract plug 96 Model Aviation through bottom fuselage min imal effort now have choice make must rejoin lower fuselage /2-in strip cloth resin can outside sanding smooth after curing can proceed lay out cut off canopy rejoin lower fuselage inside Believe doing inside isnt easy Reaching down long narrow tail boom place cloth resin difficult though its cer tainly possible experienced glass work Glue fin tail post once canopy has cut off Let say few words about compat ibility glues fiberglass used polyester resin lay up fuselage must use glue well Five-minute ep oxy wont stick well polyester no matter clean roughed up surface ever used epoxy resin laminate standard epoxy glue may used sure though clean mating surfaces thoroughly alcohol thinner rough up glass bit use CyA cyanoacrylate glues Continued page 101 Left This photo shows bottom seam Carefully apply five six layers masking tape along side seam act guide X-Acto saw seen photo right Right saw used split entire bottom fuselage open sort like gutting fish Left After complete incision has made fuselage plug may extracted glass fuselage pulling fin seen photo Right fuselage plug bottom completely removed new glass fuselage plug can used over over again Left area cutting out canopy masked off Note hole fuselage just aft canopy 3A-in steel wing rod Right canopy has cut out using X-Acto saw photo Stiffeners must now installed canopy fuselage bonding anything fiberglass Although bond feels strong tension glue cannot take shearing forces produced fuselage flexes encounters sudden impact hard landing RTV silicon glues make good alterna tive regardless type resin used overnight cure types such Dow Cornings 3145 high-strength/high-tempera ture silicon glue/sealant work best can found good electrical supply house Again no matter what glue use absolutely certain release agent has removed mating surfaces inside fuselage Sand down fiberglass nose un til clean cross section obtained Cut small block pine approximate shape nose glue fuse lage Sand shape making sure nose radius too sharp Cut out glue canopy area stiffen ers %-in balsa A1 ply doublers fuselage cut out glue stiffeners canopy itself Glue %2 ply inner liner side inside wall fin halves assuring %2-in gap between two liners %2 ply blade glued stabilator will slide pivot Install two Sullivan light cables sheaths aft fuselage time point another decision must made want one-piece airplane plug-in wings one-piece wing mark fuselage conform chosen airfoil cut away necessary fiberglass Set fuse lage aside until final assembly plug-in wings position firmly ep oxy 3/6-OD brass aluminum wing rod place set fuselage aside until final assembly Wings Basic top bottom spar construc tion used save weight upper leading edge sheeted Choose airfoils shown plan cut 26 iden tical ribs Construct outer panels first building right over plan per standard proce dure Pin ribs place add leading trailing edge stock install top spar Add leading edge sheeting re move wing plan install lower spar Though dont think shear webs nec essary outer panel conservative types may want add now stall wing tip blocks sand shape inner panel built much same way few exceptions out board rib must canted match out board section correct dihedral angle first three ribs must notched ac cept one-piece wing dihedral spar subspar tube mount plug-in wings youre building one-piece wing glue one-piece spar inboard pan nels Join two inboard halves checking dihedral correct Fill space beApril 1990 101 side view shows fiberglass f builtup rudder airfoiled stabilator Note early smaller version rud der proved inefficient larger efficient rudder shown plans horizontal tail sitting atop fiberglass fin stabilator can built flat airfoil author believes Glider performs better airfoiled configuration An end view down-turned carved Hoerner wing tip blocks Hoerner wing tip designed minimize air flow turbulence across end wing enhancing efficiency Continued page 102 downward turning wing tip seen trailing edge shot outer left wing pan el Note no shear webbing outer panel can however added makes comfortable Bear mind extra strength translates extra weight CONSORTIUM TOM HUNT 60 HAND LAUNCHED/SMAIF HIGH SA SAILPLANE IDHT 4 - 20 OZALL FLYINT IFABILYZEP wIND AREA 345 5015 /B PLYWOOD TAK PIVOT SUPPORT FLALNEI BRASS TUBE ROD AIFATNY TO IF OR STAB Il-IF INSIDE LIFICAL WITH -e BRASS KBE RYDER RAZOR SAW CANOPY EPON FYSIFACE/0-SI INBO PANFY ONLY RIFT GRADE PUOCERTEIF VA TOE SERVOS /32 PREP SYT REMOVED FROM iLlS SIDE FUR CLARIFY YB BALSA- /04 CANOPY STTFFENRT I/B 1 4 SPREE SPARS PPER YIF LOWER / A RIBS tween wings solid block soft balsa sand airfoil shape youre building two-piece plug-in wing glue A-in Lite Ply tube mount subspar both inboard sections point brass wing tube must installed Clear root rib tube will rest just under bottom top spar second rib should cleared middle third rib cleared just above top bottom spar will achieve maxi mum dihedral angle possible whatever airfoil have chosen Insert tube epoxy liberally A-in Lite Ply tube mount joining upper lower spars Add wing root filler block Sand block airfoil shape carve fit fuselage upon assembly Add 1/6-dia pin leading trailing edge secure incidence angle plugged fuselage Join inboard sections outboard panels using A-in Lite Ply dihe dral brace spar trailing edge Horizontal tail favor slab tails ease construction ignore airfoil shape shown plan believe airfoiled tails make better con trol proceed following steps Build tail building 3R-in-thick slab tail right over plan tail dry cut out two plywood templates airfoil shape tack glue onto tip caps Sand tail using long sanding block 120-grit paper thing rougher may snap ribs Cut out slot horizontal tail center line accept %2 ply blade pivot Drill A-in-dia hole Y32 ply pivot insert A-in-ID brass tube hole sand flush blade Cover tail blade favorite heat shrink ma terial Rudder Like horizontal tail rudder can probably built out scrap box Build slab sided over plan glue dry remove rudder plan sand wedge shape Bevel leading edge side onlya minimum 300 produces proper deflec tion installed one-sided bevel al lows surface hinge rudder tape trim MonoKote side fin giving effective rudder control Assembly Drill hole fin throug] glass cloth %2 ply liners th horizontal tail pivot Insert A-in-ID brass tube gluing securely Remove th section tube slot created tw /32 ply liners Insert horizontal tail bladi slot line up holes Place %2-dia brass pin pivot holes t check alignment freedom move ment Lightly sand away part binds making one-piece-wing version sert wing through opening fu selage checking alignment mci dence Sand fuselage necessary en sure good fit straightness Workinj through canopy opening glue winj fuselage using five-minute epox mixed microballoons plug-in version needs t done carve out inboard fille block fits fuselage snugly youre much carver isnt neces sary achieve exact fit just get Continued page 10 102 Model Aviation /025FY IF p e possible Wax outside fuselage area airfoil Apply mixture ep oxy microballoons roughly carved block Insert wing onto wing rod push against waxed fuselage epoxy thoroughly dry remove wing sand off excess epoxy slurry Install radio gear using positions shown plan guide cable tachment leading edge stabila tor can simple small piece brass tubing squashed flat soldered end cable Drill hole size small nail brad through flattened brass tube Insert nail through tube leading edge block tail Should hole balsa tail become sloppy simply remove nail wet hole thin CyA glue will close hole slightly regain tight fit After epoxying /6 wire tow hook place youre ready paint fuselage minimize weightremember paint heavyuse light primer coat choose dark color will cover two coats Assemble rudder fin using method described earlier Balancing aircraft should done moving radio around adding lead final balance point will estab lished flight testing start center-of-gravity shown plans regard less what airfoil chose Flying Try find helper make first few hand launches way some thing should out trim can sticks right away must admit lack finger hole makes difficult hand launch Glider forcefully grabbing just forward wing leading edge using javelin-type toss Im able get up 50-75 ft consistently Consortium very reliable performer off small high-start towline fact longest flights excess 45 mm have sort rather hand launches blame environment airplane Because models low weight short powerful 16 tubing larger ballfield type high-starts recommended act like slingshots highstarts airplane doesnt weigh enough keep parachute closed premature release almost inevitable parachute removed replaced streamer airplane has tendency overfly launch ring rubber about half expended best type high-start model made 35-50 ft 4-in-dia rubber whatever length string field dimensions will permit consistently get 200-ft-altitude launches windless days SOft rub ber 200 ft line slightest breeze can get over stake still stretching rubber slightly Using M-45 propeller airfoil Consor tium has good speed range stall predictable model requires Continued page 184 104 Model Aviation Left shot plug-in wings shows aluminum tubing epoxied place between spars first two bays left wing Wedg ing tube between spars assures correct dihedral Right mixture epoxy microballoons applied over crudely carved root blocks fuselage thoroughly waxed contact area prior pressing wings against sides create perfect mating surface photo shows wings pressed up against fuselage before epoxy begins set must make final incidence other alignment adjustments before epoxy hardens ne wings separated fuselage after epoxy completely cured ex posing formed mating surface Sand root block remove excess material fairs smoothly wings airfoil 3 New ARFs ZMP MONARCH AMA Sport Pattern span 66 area 750 sq motor 4 stroke 90 60 cu Preassembled balsa fuselage vdneered wing shaped balsa pail Lesan canopy epoxy cowl illustrated assembly manual c ZIMPRO MARKETING Pu suuJoltouKxIoGtTS3PSJO PiJOSE 51 axstex found didnt fly well rea son Extra damping quick control re sponse needed tame RC Helicopters much difficult fly full-size counterparts flybarless RC Helicopters depend stiff main rotor head improve vehicles pitch roll damping control power four-bladed hingeless head shown pictures made stacking two Baron 3OMX two-bladed hingeless heads result similar full-size Westland Lynx rotor head steel flexbeam hub gives comparable flap flexibil ity other type hingeless head BO-105 made MBB acquires its flap flexibility through fiberglass blades Wik Modelle also produces BO-105 hingeless hub blades As heads better depends whether youre talk ing Germans British original-design bearingless rotor head uses flexbeam provide bending torsion Its machined special petroleum-based synthetic called Torlon Manufactured Amoco Petroleum Prod ucts Torlon has properties steel costs about 100 times 2-ft-sq piece sells around $700 aluminum post can added top head support flybar shown pic tures friend Joe Medrano expert sheet metalist machined number rotor Sachs Doimar Engines New Torque Customized TG Only 100% SACHS Engine 27All Engines Complete $360 NNothing Buy 31See us 100 TOLEDO Show *40000 37 *43000 42 $46000 add $50 throttlecoupled spark advance Along 27 8 32 lightweight spring start flywheel-type Sachs Dolmar Engine TG MFG 201427-3845 857 HIgh Mtn Rd N Haledon NJ 07508 heads shown photos stamped own Cobra side frames welded rear exhaust muffler Thank Joe Next months sequel will present -scale four-bladed bearingless model ro tor tested Glenn L Martin wind tun nel University Maryland Along million-dollar tunnel youll see some exotic blades swashplates miniature hydraulic servo actuators control sys tems Consortium/Hunt Continued page 104 slight down elevator pick up hold some speed chasing next thermal Ron Farkas built model Ep pIer 201 airfoil its higher weight 3 oz heavier thinner wing version flies just well higher speed Oth ers made Clark Y RAF 32 Ep pIer 193 airfoils scheduled flown soon after article submitted As builder get bored very easily same old construction techniques same old low-wing sport high-wing trainer airplanes Im hobby learn well have fun certainly did both designing Consortium hope reading about project has acquaint ed some new techniques build ing designing model airplanes youve got urge try something differentand little time spend workshopthis classy-looking good-per forming Sailplane will give lot fun small flying field RC Soaring/Blakeslee Continued page 43 museum its displays programs will knock out Make effort joinor visit join t guarantee youll regret either address National Soaring Museum RD#3 Har ris Hill Elmira NY 14903 Thanks Cal Weiss taking time tell us about NSM Im sure model Glider fliers appreciate learning about will plan stop area tn cover letter Cal mentioned tht photos prt vided Shirley Sliwa Director NSM C also passed along personal information am retired NASA Lewis Researe Center Cleveland last 22 3 years directed work Educ tional Services Office Several notable moc elers Chet Lanzo Warren Plohr Reich brothers see Warren occasion club fieldI am member America Airlines Model Club Chet course just rc cently passed away Way back membe Board NAR along John Worth kind establishes Ive fiel bit time fact know few real pros should add fly almost week Jo Elgin designer Playboy makes no bet ter flier models t have active witl RC Gliders five years am having ball managed 1 hr. 15 mm flight oh Windrifter summer Lord t t did kept pulling up kept trying keep sight reasonable alti tude tm interested areas aviation top soaring tt has always fascinated mt just because beauty carries over intc modeling Scale look beauty RC Sailplane much like real thing anything dont like its beautiful Seal model Cub flies what appears super sonic speeds wife also loves sailplanes ant together have attended several Nationals ant regional contests spectators fact las visit museum dedication thi same time Region 3 contest Harris Hill 1 guess natural believi other Sailplane modelers also interested thi full-size ones museum Its reasot put article together Perhaps some mod elers within reach museum will make ths effort visit live too far away perhaps article will interest may wish become members event atr turned want pass information tc others International Postal Challenge Old-time readers column will remember previous re ports Kale Harden Palm Harbor FL IPC idea behind postal contest club several countries fly same contest same day compare results mail sure its interesting fun-fly con cept way meet Sailplaners other countries Kale Pelicans Club St Pete sent reContinued page J& 184 Model Aviation Special Introductory Offer SUKHOI Su-26M15 ScaleIMPALA Masters Pattern span 68 area 890 sq motor 4 stroke 120 equivspan 68 area 800 sq motor 4 stroke 120 60 rear Preassembled lightweight epoxy fuselage sheeted plug-in wingsPreassembled balsa fusefage veneered plug-in wings & stabs sheeted stab fin & rudder 8 dia epoxy cowl Lexan canopy &Epoxy cowl pipe cover removable canopy Illustrated illustrated assembly manualassembly manual see hobby dealer order direct
Edition: Model Aviation - 1990/04
Page Numbers: 93, 94, 95, 96, 101, 102, 104, 184
IT WAS CASE lunchtime hying squeeze As company work has ex panded lunchtime flying field has shrinking around writing di mensions field approximately 150 yards square down nearly 400 yards square tremendous loss area already prompted elimination RC aircraft over 20 cu knew something needed done efficiently safely utilize what left field have al ways liked idea flying Gliders lunchtime Theyre clean require less field support equipment no big heavy field box did some research small Hand-Launched RC Glider kits cur rently available didnt find anything really grabbed aesthetically short jump decision de sign own Consortium began take shape decided design requirements built one-piece wing aircraft fit easily small Toyota liftback made plug-in wings would have strong enough take standard high-start tow load fuselage look sexyno slab sides Strong Top Consortium flight what looks promising inermai weather 15-meter Sail plane looks flies much like larger counterparts Above author launching M-45 airfoil-equipped version Vermont Mountain Retreat small high-start launched Glider high enough go thermal hunting over thickly wooded slope background April 1990 93 Ron Farkas launching Eppler 201 airfoilThis Consortium built authors friend Ron Farkas Its equipped Epplerequipped Glider high-start struc 201 airfoIl giving thinner wing making slightly heavier about three ounces thantures background give some idea authors prototype thin-winged version flies just well considerably fasterthe limited size lunchtime flying field 3 1 Consortium flying past expanded office building complex spawned idea developina small multifunction Glider may tight squeeze fits Ron Farkas Glider seen its 225-mAh battery pack standard Futaba servos hidden under wing rather large Futaba rkrn kIte stiffeners around Fuselage cutout upside-down canopy Lonsortlum crew right left Bob Aberle Ron Farkas Howie Applegate Tom Hunt Hank Stumpf Nick Dannendorfer Other Consortium builders pi include Paul Bell George Myers Scott Conover Bob Roth Jr Phil John Kicisler Ron Zulow Phil Kielsier recently finished flew Clark V-equipped Consortium its understood RAF 32 Eppler 193 airfoil-equipped versions would soon flying 94 Model Aviation T-tail looks performance out harms way launching landing Rudder/elevator control keep sim ple variants include coupled ai leron rudder Finally aircraft should have lightweight structure good performance design emerged 60-in-span built-up constant-chord polyhedral wing Wing area 345 sq Building shapely non-slab-sided fuselage out balsa would have added too much weight fiberglass construction chosen later Control provided constant-chord stabilator top molded-in fin/fuse lage adjoining rudder Though may seem rather bulbous some tastes fuselage proportioned permit use standard-size radio gear use 225or 100-mAh receiver pack total weight may little what youd get mis stage heavy 6-az cloth draped over nose section uru oca 1fle trailing edge forward nose Apply resin nerously Right photo 2-oz cloth has applied wing trailing edge point aft fin plus some forward overlap systems offer just miniservos standard-size receiver Total weight odel should between 14 20 ounces Something told project ing popular fellow ers Sure enough no sooner showed ound some first draft plans men ned fuselage would fiberglass dreaded words isiness heard want So offered produce fuselages ub members no cost expected return told airplane built just collect dust base ent also expected posed photographs builders models near pressmefinished Thoughts lunchtime Precision Dura contests soon followed builder iould vary basic design choos g own airfoil could irfoils shown plans another wn choice Construction uselage Fiberglass construction tends care lot people away especially must done scratch case scratch means creating master out some easily workable material bass wood foam Prepare master release agent Position jig half ex posed begin heavy glass layup exposed surface produce female mold half fuselage Allow first half cure flip over master re peat process other half Use medium-weight glass lay up fuse lage molds Join two halves theyre still wet molds After final curing sepa rate molds sand edges newly formed fuselage Whew Youve fi nally got something can attach wings tail Its lot work fuselage unless Consortium will also club venture Keep mind smoother accurate master better mold However theres easierand equally sat isfyingway creating light strong fi berglass parts mold needs done create shape part soft wood pine fine basswood bet ter Carve shape wood using tem plates guide isnt necessary repli cate exact contour just sure part looks symmetrical shape satis factory seal wood sanding seal er Drill /8-in hole nose other tail support part jig Any type crude jig built house hold lumber pile fine see photos Cover entire mold fiberglass re lease agent available auto supply stores marinas Cut out oversized piece 2-oz glass cloth K&B medium approximately shape fuselage Drape cloth over left-hand side fuselage gently coax hand shape fuselage Mark fiberglass felt-tip marker about /4 % farther around onto right-hand side fuselage continuing way around profile Remove glass cut along line just fin ished marking Put piece glass onto some stiff cardboard transfer shape Cut out cardboard duplicate now pattern producing glass lay ers After much experimentation strongest lightest fuselage obtained cut ting out two left right sides layApril 1990 95 second layer 2-oz cloth draped over entire fuselage underlying layers still wet still wet resin rked second layer Right cured fuselage plug still inside has carefully wet sanded until its perfectly smooth ers entire profile K&B mediumweight cloth approximately 2 oz cloth becomes outside layer make inside nose layer cut out two profiles approximately trailing edge wing forward using K&B heavy cloth ap proximately 6 oz Cut two profiles K&B medium cloth trailing edge wing aft fin allowing some forward overlap inside layer tail boom fin Begin laying up heavier nose layer Dont worry doesnt conform tight nose radiuswell fix later pine nose block Continue wet layup medium-weight glass cloth aft wing position sections secure drape full-length piece over first layers dab dry brush against glass bring resin surface wetting outside layer thoroughly Try get outside layer thoroughly wet using ad ditional resin cup since will have sanded off later Allow resin cure thoroughly remove glass-wrapped plug fixture Take slop sink basement dont have slop sink dont have basement call self modeler start wet sanding fuselage its still plug Continue sanding until youre happy finish Dont prime fuselage sandable primer unless want sand off tween coats primer does highlight holes lumps very well its also very heavy Once finish acceptable apply three four layers masking tape along entire bottom centerline fuselage length Remove reusable plug cutting through fuselage along maskingtape guideline fine-toothed X-Acto saw Dont worry about scratching up plug sawing Its outside fi berglass outside plug needs smooth nice finish After 13 fuselages plug looks like heck still produces nice parts Once have sawn through entire bottom glass fuselage begin prying off plug plug properly waxed will separate easily glass should able quickly extract plug 96 Model Aviation through bottom fuselage min imal effort now have choice make must rejoin lower fuselage /2-in strip cloth resin can outside sanding smooth after curing can proceed lay out cut off canopy rejoin lower fuselage inside Believe doing inside isnt easy Reaching down long narrow tail boom place cloth resin difficult though its cer tainly possible experienced glass work Glue fin tail post once canopy has cut off Let say few words about compat ibility glues fiberglass used polyester resin lay up fuselage must use glue well Five-minute ep oxy wont stick well polyester no matter clean roughed up surface ever used epoxy resin laminate standard epoxy glue may used sure though clean mating surfaces thoroughly alcohol thinner rough up glass bit use CyA cyanoacrylate glues Continued page 101 Left This photo shows bottom seam Carefully apply five six layers masking tape along side seam act guide X-Acto saw seen photo right Right saw used split entire bottom fuselage open sort like gutting fish Left After complete incision has made fuselage plug may extracted glass fuselage pulling fin seen photo Right fuselage plug bottom completely removed new glass fuselage plug can used over over again Left area cutting out canopy masked off Note hole fuselage just aft canopy 3A-in steel wing rod Right canopy has cut out using X-Acto saw photo Stiffeners must now installed canopy fuselage bonding anything fiberglass Although bond feels strong tension glue cannot take shearing forces produced fuselage flexes encounters sudden impact hard landing RTV silicon glues make good alterna tive regardless type resin used overnight cure types such Dow Cornings 3145 high-strength/high-tempera ture silicon glue/sealant work best can found good electrical supply house Again no matter what glue use absolutely certain release agent has removed mating surfaces inside fuselage Sand down fiberglass nose un til clean cross section obtained Cut small block pine approximate shape nose glue fuse lage Sand shape making sure nose radius too sharp Cut out glue canopy area stiffen ers %-in balsa A1 ply doublers fuselage cut out glue stiffeners canopy itself Glue %2 ply inner liner side inside wall fin halves assuring %2-in gap between two liners %2 ply blade glued stabilator will slide pivot Install two Sullivan light cables sheaths aft fuselage time point another decision must made want one-piece airplane plug-in wings one-piece wing mark fuselage conform chosen airfoil cut away necessary fiberglass Set fuse lage aside until final assembly plug-in wings position firmly ep oxy 3/6-OD brass aluminum wing rod place set fuselage aside until final assembly Wings Basic top bottom spar construc tion used save weight upper leading edge sheeted Choose airfoils shown plan cut 26 iden tical ribs Construct outer panels first building right over plan per standard proce dure Pin ribs place add leading trailing edge stock install top spar Add leading edge sheeting re move wing plan install lower spar Though dont think shear webs nec essary outer panel conservative types may want add now stall wing tip blocks sand shape inner panel built much same way few exceptions out board rib must canted match out board section correct dihedral angle first three ribs must notched ac cept one-piece wing dihedral spar subspar tube mount plug-in wings youre building one-piece wing glue one-piece spar inboard pan nels Join two inboard halves checking dihedral correct Fill space beApril 1990 101 side view shows fiberglass f builtup rudder airfoiled stabilator Note early smaller version rud der proved inefficient larger efficient rudder shown plans horizontal tail sitting atop fiberglass fin stabilator can built flat airfoil author believes Glider performs better airfoiled configuration An end view down-turned carved Hoerner wing tip blocks Hoerner wing tip designed minimize air flow turbulence across end wing enhancing efficiency Continued page 102 downward turning wing tip seen trailing edge shot outer left wing pan el Note no shear webbing outer panel can however added makes comfortable Bear mind extra strength translates extra weight CONSORTIUM TOM HUNT 60 HAND LAUNCHED/SMAIF HIGH SA SAILPLANE IDHT 4 - 20 OZALL FLYINT IFABILYZEP wIND AREA 345 5015 /B PLYWOOD TAK PIVOT SUPPORT FLALNEI BRASS TUBE ROD AIFATNY TO IF OR STAB Il-IF INSIDE LIFICAL WITH -e BRASS KBE RYDER RAZOR SAW CANOPY EPON FYSIFACE/0-SI INBO PANFY ONLY RIFT GRADE PUOCERTEIF VA TOE SERVOS /32 PREP SYT REMOVED FROM iLlS SIDE FUR CLARIFY YB BALSA- /04 CANOPY STTFFENRT I/B 1 4 SPREE SPARS PPER YIF LOWER / A RIBS tween wings solid block soft balsa sand airfoil shape youre building two-piece plug-in wing glue A-in Lite Ply tube mount subspar both inboard sections point brass wing tube must installed Clear root rib tube will rest just under bottom top spar second rib should cleared middle third rib cleared just above top bottom spar will achieve maxi mum dihedral angle possible whatever airfoil have chosen Insert tube epoxy liberally A-in Lite Ply tube mount joining upper lower spars Add wing root filler block Sand block airfoil shape carve fit fuselage upon assembly Add 1/6-dia pin leading trailing edge secure incidence angle plugged fuselage Join inboard sections outboard panels using A-in Lite Ply dihe dral brace spar trailing edge Horizontal tail favor slab tails ease construction ignore airfoil shape shown plan believe airfoiled tails make better con trol proceed following steps Build tail building 3R-in-thick slab tail right over plan tail dry cut out two plywood templates airfoil shape tack glue onto tip caps Sand tail using long sanding block 120-grit paper thing rougher may snap ribs Cut out slot horizontal tail center line accept %2 ply blade pivot Drill A-in-dia hole Y32 ply pivot insert A-in-ID brass tube hole sand flush blade Cover tail blade favorite heat shrink ma terial Rudder Like horizontal tail rudder can probably built out scrap box Build slab sided over plan glue dry remove rudder plan sand wedge shape Bevel leading edge side onlya minimum 300 produces proper deflec tion installed one-sided bevel al lows surface hinge rudder tape trim MonoKote side fin giving effective rudder control Assembly Drill hole fin throug] glass cloth %2 ply liners th horizontal tail pivot Insert A-in-ID brass tube gluing securely Remove th section tube slot created tw /32 ply liners Insert horizontal tail bladi slot line up holes Place %2-dia brass pin pivot holes t check alignment freedom move ment Lightly sand away part binds making one-piece-wing version sert wing through opening fu selage checking alignment mci dence Sand fuselage necessary en sure good fit straightness Workinj through canopy opening glue winj fuselage using five-minute epox mixed microballoons plug-in version needs t done carve out inboard fille block fits fuselage snugly youre much carver isnt neces sary achieve exact fit just get Continued page 10 102 Model Aviation /025FY IF p e possible Wax outside fuselage area airfoil Apply mixture ep oxy microballoons roughly carved block Insert wing onto wing rod push against waxed fuselage epoxy thoroughly dry remove wing sand off excess epoxy slurry Install radio gear using positions shown plan guide cable tachment leading edge stabila tor can simple small piece brass tubing squashed flat soldered end cable Drill hole size small nail brad through flattened brass tube Insert nail through tube leading edge block tail Should hole balsa tail become sloppy simply remove nail wet hole thin CyA glue will close hole slightly regain tight fit After epoxying /6 wire tow hook place youre ready paint fuselage minimize weightremember paint heavyuse light primer coat choose dark color will cover two coats Assemble rudder fin using method described earlier Balancing aircraft should done moving radio around adding lead final balance point will estab lished flight testing start center-of-gravity shown plans regard less what airfoil chose Flying Try find helper make first few hand launches way some thing should out trim can sticks right away must admit lack finger hole makes difficult hand launch Glider forcefully grabbing just forward wing leading edge using javelin-type toss Im able get up 50-75 ft consistently Consortium very reliable performer off small high-start towline fact longest flights excess 45 mm have sort rather hand launches blame environment airplane Because models low weight short powerful 16 tubing larger ballfield type high-starts recommended act like slingshots highstarts airplane doesnt weigh enough keep parachute closed premature release almost inevitable parachute removed replaced streamer airplane has tendency overfly launch ring rubber about half expended best type high-start model made 35-50 ft 4-in-dia rubber whatever length string field dimensions will permit consistently get 200-ft-altitude launches windless days SOft rub ber 200 ft line slightest breeze can get over stake still stretching rubber slightly Using M-45 propeller airfoil Consor tium has good speed range stall predictable model requires Continued page 184 104 Model Aviation Left shot plug-in wings shows aluminum tubing epoxied place between spars first two bays left wing Wedg ing tube between spars assures correct dihedral Right mixture epoxy microballoons applied over crudely carved root blocks fuselage thoroughly waxed contact area prior pressing wings against sides create perfect mating surface photo shows wings pressed up against fuselage before epoxy begins set must make final incidence other alignment adjustments before epoxy hardens ne wings separated fuselage after epoxy completely cured ex posing formed mating surface Sand root block remove excess material fairs smoothly wings airfoil 3 New ARFs ZMP MONARCH AMA Sport Pattern span 66 area 750 sq motor 4 stroke 90 60 cu Preassembled balsa fuselage vdneered wing shaped balsa pail Lesan canopy epoxy cowl illustrated assembly manual c ZIMPRO MARKETING Pu suuJoltouKxIoGtTS3PSJO PiJOSE 51 axstex found didnt fly well rea son Extra damping quick control re sponse needed tame RC Helicopters much difficult fly full-size counterparts flybarless RC Helicopters depend stiff main rotor head improve vehicles pitch roll damping control power four-bladed hingeless head shown pictures made stacking two Baron 3OMX two-bladed hingeless heads result similar full-size Westland Lynx rotor head steel flexbeam hub gives comparable flap flexibil ity other type hingeless head BO-105 made MBB acquires its flap flexibility through fiberglass blades Wik Modelle also produces BO-105 hingeless hub blades As heads better depends whether youre talk ing Germans British original-design bearingless rotor head uses flexbeam provide bending torsion Its machined special petroleum-based synthetic called Torlon Manufactured Amoco Petroleum Prod ucts Torlon has properties steel costs about 100 times 2-ft-sq piece sells around $700 aluminum post can added top head support flybar shown pic tures friend Joe Medrano expert sheet metalist machined number rotor Sachs Doimar Engines New Torque Customized TG Only 100% SACHS Engine 27All Engines Complete $360 NNothing Buy 31See us 100 TOLEDO Show *40000 37 *43000 42 $46000 add $50 throttlecoupled spark advance Along 27 8 32 lightweight spring start flywheel-type Sachs Dolmar Engine TG MFG 201427-3845 857 HIgh Mtn Rd N Haledon NJ 07508 heads shown photos stamped own Cobra side frames welded rear exhaust muffler Thank Joe Next months sequel will present -scale four-bladed bearingless model ro tor tested Glenn L Martin wind tun nel University Maryland Along million-dollar tunnel youll see some exotic blades swashplates miniature hydraulic servo actuators control sys tems Consortium/Hunt Continued page 104 slight down elevator pick up hold some speed chasing next thermal Ron Farkas built model Ep pIer 201 airfoil its higher weight 3 oz heavier thinner wing version flies just well higher speed Oth ers made Clark Y RAF 32 Ep pIer 193 airfoils scheduled flown soon after article submitted As builder get bored very easily same old construction techniques same old low-wing sport high-wing trainer airplanes Im hobby learn well have fun certainly did both designing Consortium hope reading about project has acquaint ed some new techniques build ing designing model airplanes youve got urge try something differentand little time spend workshopthis classy-looking good-per forming Sailplane will give lot fun small flying field RC Soaring/Blakeslee Continued page 43 museum its displays programs will knock out Make effort joinor visit join t guarantee youll regret either address National Soaring Museum RD#3 Har ris Hill Elmira NY 14903 Thanks Cal Weiss taking time tell us about NSM Im sure model Glider fliers appreciate learning about will plan stop area tn cover letter Cal mentioned tht photos prt vided Shirley Sliwa Director NSM C also passed along personal information am retired NASA Lewis Researe Center Cleveland last 22 3 years directed work Educ tional Services Office Several notable moc elers Chet Lanzo Warren Plohr Reich brothers see Warren occasion club fieldI am member America Airlines Model Club Chet course just rc cently passed away Way back membe Board NAR along John Worth kind establishes Ive fiel bit time fact know few real pros should add fly almost week Jo Elgin designer Playboy makes no bet ter flier models t have active witl RC Gliders five years am having ball managed 1 hr. 15 mm flight oh Windrifter summer Lord t t did kept pulling up kept trying keep sight reasonable alti tude tm interested areas aviation top soaring tt has always fascinated mt just because beauty carries over intc modeling Scale look beauty RC Sailplane much like real thing anything dont like its beautiful Seal model Cub flies what appears super sonic speeds wife also loves sailplanes ant together have attended several Nationals ant regional contests spectators fact las visit museum dedication thi same time Region 3 contest Harris Hill 1 guess natural believi other Sailplane modelers also interested thi full-size ones museum Its reasot put article together Perhaps some mod elers within reach museum will make ths effort visit live too far away perhaps article will interest may wish become members event atr turned want pass information tc others International Postal Challenge Old-time readers column will remember previous re ports Kale Harden Palm Harbor FL IPC idea behind postal contest club several countries fly same contest same day compare results mail sure its interesting fun-fly con cept way meet Sailplaners other countries Kale Pelicans Club St Pete sent reContinued page J& 184 Model Aviation Special Introductory Offer SUKHOI Su-26M15 ScaleIMPALA Masters Pattern span 68 area 890 sq motor 4 stroke 120 equivspan 68 area 800 sq motor 4 stroke 120 60 rear Preassembled lightweight epoxy fuselage sheeted plug-in wingsPreassembled balsa fusefage veneered plug-in wings & stabs sheeted stab fin & rudder 8 dia epoxy cowl Lexan canopy &Epoxy cowl pipe cover removable canopy Illustrated illustrated assembly manualassembly manual see hobby dealer order direct