Indoor Bud Tenny TRULY COMPETITIVE activity kind model flying requires careful atten tion detail especially true indoor models time model flown things must exactly right model give its best performance wing incidence right tiny fraction degree change incidence will make noticeable difference performance yet 1/16 change incidence degree wing 3 wide change props super FAI ship does new prop weigh same old change prop weight aver age FAI indoor model will shift center gravity about oz weight change Does explain super model suddenly started flying like lead sled Check List time model flown things should carefully checked before flight before leaving home 1 Are repairs made re suIt previous flying sessions 2 Assemble model completely examine washin/washout stab tilt rudder setting Bounce model lightly moving up down enough stress bracing slightly look changes wing alignment loose wires 3 Locate repair tiny holes microfilm especially prop 4 Check thrust bearing rear hook sure securethese parts take terrific stress under full turns 5 Be sure wing incidence correct several models same box sure proper parts get gether have prop planned 6 Be sure have intended rubber motor making new motors sure size batch rubber used source 7 Know much power torque needed flying restricted ceil ings both maximize performance prevent hangups model damage 8 When making flight trim adjust ments change thing time keep appropriate records verify performance changes Built-in Reliability flier wins lot probably has reliable model well trimmed thoroughly checked number building design practices help create reliable models sel dom need changes trim 1 Wing sockets should have balsa plug bottom wing posts can bottom out against plugs Change wing incidence cutting tiny pieces off end post use fin gernail clippers always push post way post should snug fit socket prevent flight loads pulling post out socket 2 Always sure wing sockets parallel other wing has same washin/washout model bracing jig packing jig holds wing storage box bottom end socket must glued mo torstick wing will shift around flight 3 The wing posts cabane must strong enough handle flight ground handling loads Otherwise model will inconsistent Continued page 94 I I IIi I I I I I ~i\jRIe SPAR FIG I / SPAR FORM flr~ FIG 2 SPAR FIG3 FIG 4 Fig 1 Wing jig can posterboard cut outline shape notches give room glue ribs place Fig 2 Pin narrow balsa strips place wedging action through wood Fig 3 An angle splice makes strong light joint Fig 4 compression rib bottom gives added strength critical points wing April 1977 39 Fig 5 same jig can used building covering microfilm wing solid ribs support single ribs during covering Chilton pic Fig 6 Stan Chilton uses same Easy-B jig building covering attaching wing posts Slot allows post alignment Chilton pic nearing end read havent started new ship next season could well advised look partial kits produced P & W Model Service PO Box 925 Monrovia CA 91016 Schmidt Custom Kits 11948 Franklin Blvd Elk Grove CA 95624 Clipper built P & W par tial kit John Pond plans couldnt believe low price such quality product kit consisted ribs wing stab tips rudder outline curved fuselage parts plus plywood firewall P & W stocks variety popular designs Schmidt Custom will supply partial kits nearly design custom basis Prices right Write lists OT Event Month Rubber Rubber power began still offers challenging satisfying di version Old-Timer enthusiasts fly rubber events Prior introduc tion gas engine rubber models reached considerable sophistication early Zaic yearbooks provide wealth still pertinent information well multitude designs de signs look right home coitest field today Several fact could pass Coupe dHivers SAM rules call strict adherence original design means fold ing props allowed unless used original designs utilizing folders well single-blade prop avail able Prop carving builds character say rate mystery about prop carving removed Zaic yearbooks pitch determination basic theory modelers today feel qual ity rubber 30s better what currently available Having little experience old stock am no position comment However no limits amount rubber allowed duplicate performance should achiev able experimental nature models employing two motors gearing single prop available Old-Timer enthusiast Some systems quite elaborate yet easily fabricated modelers work shop Braided motors another interesting aspect technique developed means combining long running time long motor power burst short motor thereby hopefully obtaining best both worlds Rubber models require fussing perhaps gas models rubber re quires frequent washing eliminate grit lubrication improve life perform ance inspection detect impending fail ure effort prevent exposure heat sunlight regimented preflight proce dure insure proper power under ever present possibility bursting motor destroying model sounds rather formidable actuality great relaxation free dif ficulties locating procuring ig nition engine dont have oil over model days end Clarence Haught Route 5 Box 16 Coeur dA lene ID 83814 FF Indoor/Tenny Continued page 39 may handle high power tur bulent air 4 Use adequate reinforcement around thrust bearing have adequate clearance between motorstick motor Full-power hookups se verely stress front motorstick rubbing knots kill climb and/or wreck stick rubbing through wood 5 Color-code parts model including prop different props used same model sure prop weighs same others Mark props identify pitch different pitch props used 6 Keep careful records model per formance enough detail able repeat good performances 7 If possible test batch rubber keep track motor us ing small marked envelopes sure return motor its home after use different batches vary widely quality important know lind rubber using possible allow crum rubber motor unknown quality sure give nasty surprise 8 Build fly particular design enough learn its strengths weaknesses Take care make successive model design iden tical possible previous models use patterns templates insure uniformity Keep records compo nent weights guide future decisions building remember structure too light hold its shape properly will contribute inconsis tent performance 9 Be aware relationship between models center gravity center motor two points very far apart changing weight rubber will cause models center gravity shift Model Assembly Jigs basic door model jig after prop block cov ered previous columns wing stab outline jig its simplest form outline jig thin cardboard posterboard cut just small enough fit inside wing stab outline Fig 1 Notches 94 Model Aviation STOP ON COMMAND FRICTION BRAKE Complete 10 po nose wheel brake linkage hook-up Features NEW case hardened steel brake drum other fine quality parts Requires very little pressure engage NO 1 57 $2 95 Wh.I ING GEAR STRAPS eofsteel-light strong Includes 4 Straps -iTNO~88 Screws DU BRO UCTS INC 480 BONNER ROAD WAUCONDA ILL 60084DU cut perimeter give clearance ribs attach outline expanded view Fig 1 Careful work allows wing stab essentially identical previous ones except chance tentional variations wood thickness grade use form first shape curved portions outline wrap ping moist balsa strips proper size around identically shaped tip form baking oven set low heat Straight portions outline laid place straight pins holding against form Fig 2 shows delicate strips held placenever pin through wood Use angle splice Fig 3 join curved portions straight sec tions using care avoid glueing strips form Finally ribs cut exact length glued place Variations Theme compression ribs Fig 4 used form must slotted entire length rib shown Fig 5 dark lines appear between solid rib supports jig shown Fig 5 used both building wing covering solid ribs support standard ribs during covering opera tion prevent pressure micro film distorting ribs Another vari ation shown Fig 6 Easy B jig al lows wing built dihedral already installed covered wing posts attached slot supporting frame allows posts visually aligned similar arrangement can used bracingwhich would allow wing completed before ever removed work surface very careful work extremely accurate con struction wings can made Bud Tenny P 0 Box 545 Richardson TX 75080 Answer Continued page 43 fuselage upside down bench check its alignment Weigh down much necessary hold true against surface put weight top longerons nearest bench Other cross pieces forward TE station now inserted dry sides pulled together rear cementednote beveled joint important accurately make sure rest top fuselage plan tail joint centerline correct before cement dries remaining top bottom cross pieces now cut length glued place upper part cabin tricky said before some suggestions given Stringers should hard balsa prevent unsightly bowing shrinkage covering r FOR SHARK 60 OWNERS. Stahl design see tocal hobby dealer - 4 RUBBER & CO2 OGA *109 und AWINNERAT THE 5OIhNATS V t 4Oyeors ago Send tree brochure 10% FOR PACKING AND POSTAGE VA RESIDENTS ADD 4% TAD 22 I/2 WINGSPAN 6695 nose block pieces should glued place before final shaping Just sure true sand rear front faces pieces before commit yourself Start side blocks see comment below engine installation glue projecting top longeron bulkhead 1-B glue front block finally bottom block Note first trimmed fit inside surface some what cut away lightness before located engine mounting differs original model beam mounts Since engine mounted well forward FLYLINE 10643 ASHBY FL MODELS FAIRFAX VA 22030 front cabin bulkhead small ply wood firewall cut out per plans located means two balsa rectan gular pieces grain fore aft shown Blind nuts make easy bolt engine place remove make thrustline adjustments placing thin washers metal shims between case fire wallaccording adjustment needs would well coat interior engine compartment epoxy protect absorbing fuel exhaust wastes Covering Important note skele ton photos show straight dihedral finished wing has elliptical dihedral April 1977 95 O3 Notr novice flyers RO PRODUCTS INCORPORATED 480 Benner Read Waucenda IllInels 60084 USA 24 l/2 WINGSPAN 28 WINGSPAN S6
Edition: Model Aviation - 1977/04
Page Numbers: 39, 94, 95
Indoor Bud Tenny TRULY COMPETITIVE activity kind model flying requires careful atten tion detail especially true indoor models time model flown things must exactly right model give its best performance wing incidence right tiny fraction degree change incidence will make noticeable difference performance yet 1/16 change incidence degree wing 3 wide change props super FAI ship does new prop weigh same old change prop weight aver age FAI indoor model will shift center gravity about oz weight change Does explain super model suddenly started flying like lead sled Check List time model flown things should carefully checked before flight before leaving home 1 Are repairs made re suIt previous flying sessions 2 Assemble model completely examine washin/washout stab tilt rudder setting Bounce model lightly moving up down enough stress bracing slightly look changes wing alignment loose wires 3 Locate repair tiny holes microfilm especially prop 4 Check thrust bearing rear hook sure securethese parts take terrific stress under full turns 5 Be sure wing incidence correct several models same box sure proper parts get gether have prop planned 6 Be sure have intended rubber motor making new motors sure size batch rubber used source 7 Know much power torque needed flying restricted ceil ings both maximize performance prevent hangups model damage 8 When making flight trim adjust ments change thing time keep appropriate records verify performance changes Built-in Reliability flier wins lot probably has reliable model well trimmed thoroughly checked number building design practices help create reliable models sel dom need changes trim 1 Wing sockets should have balsa plug bottom wing posts can bottom out against plugs Change wing incidence cutting tiny pieces off end post use fin gernail clippers always push post way post should snug fit socket prevent flight loads pulling post out socket 2 Always sure wing sockets parallel other wing has same washin/washout model bracing jig packing jig holds wing storage box bottom end socket must glued mo torstick wing will shift around flight 3 The wing posts cabane must strong enough handle flight ground handling loads Otherwise model will inconsistent Continued page 94 I I IIi I I I I I ~i\jRIe SPAR FIG I / SPAR FORM flr~ FIG 2 SPAR FIG3 FIG 4 Fig 1 Wing jig can posterboard cut outline shape notches give room glue ribs place Fig 2 Pin narrow balsa strips place wedging action through wood Fig 3 An angle splice makes strong light joint Fig 4 compression rib bottom gives added strength critical points wing April 1977 39 Fig 5 same jig can used building covering microfilm wing solid ribs support single ribs during covering Chilton pic Fig 6 Stan Chilton uses same Easy-B jig building covering attaching wing posts Slot allows post alignment Chilton pic nearing end read havent started new ship next season could well advised look partial kits produced P & W Model Service PO Box 925 Monrovia CA 91016 Schmidt Custom Kits 11948 Franklin Blvd Elk Grove CA 95624 Clipper built P & W par tial kit John Pond plans couldnt believe low price such quality product kit consisted ribs wing stab tips rudder outline curved fuselage parts plus plywood firewall P & W stocks variety popular designs Schmidt Custom will supply partial kits nearly design custom basis Prices right Write lists OT Event Month Rubber Rubber power began still offers challenging satisfying di version Old-Timer enthusiasts fly rubber events Prior introduc tion gas engine rubber models reached considerable sophistication early Zaic yearbooks provide wealth still pertinent information well multitude designs de signs look right home coitest field today Several fact could pass Coupe dHivers SAM rules call strict adherence original design means fold ing props allowed unless used original designs utilizing folders well single-blade prop avail able Prop carving builds character say rate mystery about prop carving removed Zaic yearbooks pitch determination basic theory modelers today feel qual ity rubber 30s better what currently available Having little experience old stock am no position comment However no limits amount rubber allowed duplicate performance should achiev able experimental nature models employing two motors gearing single prop available Old-Timer enthusiast Some systems quite elaborate yet easily fabricated modelers work shop Braided motors another interesting aspect technique developed means combining long running time long motor power burst short motor thereby hopefully obtaining best both worlds Rubber models require fussing perhaps gas models rubber re quires frequent washing eliminate grit lubrication improve life perform ance inspection detect impending fail ure effort prevent exposure heat sunlight regimented preflight proce dure insure proper power under ever present possibility bursting motor destroying model sounds rather formidable actuality great relaxation free dif ficulties locating procuring ig nition engine dont have oil over model days end Clarence Haught Route 5 Box 16 Coeur dA lene ID 83814 FF Indoor/Tenny Continued page 39 may handle high power tur bulent air 4 Use adequate reinforcement around thrust bearing have adequate clearance between motorstick motor Full-power hookups se verely stress front motorstick rubbing knots kill climb and/or wreck stick rubbing through wood 5 Color-code parts model including prop different props used same model sure prop weighs same others Mark props identify pitch different pitch props used 6 Keep careful records model per formance enough detail able repeat good performances 7 If possible test batch rubber keep track motor us ing small marked envelopes sure return motor its home after use different batches vary widely quality important know lind rubber using possible allow crum rubber motor unknown quality sure give nasty surprise 8 Build fly particular design enough learn its strengths weaknesses Take care make successive model design iden tical possible previous models use patterns templates insure uniformity Keep records compo nent weights guide future decisions building remember structure too light hold its shape properly will contribute inconsis tent performance 9 Be aware relationship between models center gravity center motor two points very far apart changing weight rubber will cause models center gravity shift Model Assembly Jigs basic door model jig after prop block cov ered previous columns wing stab outline jig its simplest form outline jig thin cardboard posterboard cut just small enough fit inside wing stab outline Fig 1 Notches 94 Model Aviation STOP ON COMMAND FRICTION BRAKE Complete 10 po nose wheel brake linkage hook-up Features NEW case hardened steel brake drum other fine quality parts Requires very little pressure engage NO 1 57 $2 95 Wh.I ING GEAR STRAPS eofsteel-light strong Includes 4 Straps -iTNO~88 Screws DU BRO UCTS INC 480 BONNER ROAD WAUCONDA ILL 60084DU cut perimeter give clearance ribs attach outline expanded view Fig 1 Careful work allows wing stab essentially identical previous ones except chance tentional variations wood thickness grade use form first shape curved portions outline wrap ping moist balsa strips proper size around identically shaped tip form baking oven set low heat Straight portions outline laid place straight pins holding against form Fig 2 shows delicate strips held placenever pin through wood Use angle splice Fig 3 join curved portions straight sec tions using care avoid glueing strips form Finally ribs cut exact length glued place Variations Theme compression ribs Fig 4 used form must slotted entire length rib shown Fig 5 dark lines appear between solid rib supports jig shown Fig 5 used both building wing covering solid ribs support standard ribs during covering opera tion prevent pressure micro film distorting ribs Another vari ation shown Fig 6 Easy B jig al lows wing built dihedral already installed covered wing posts attached slot supporting frame allows posts visually aligned similar arrangement can used bracingwhich would allow wing completed before ever removed work surface very careful work extremely accurate con struction wings can made Bud Tenny P 0 Box 545 Richardson TX 75080 Answer Continued page 43 fuselage upside down bench check its alignment Weigh down much necessary hold true against surface put weight top longerons nearest bench Other cross pieces forward TE station now inserted dry sides pulled together rear cementednote beveled joint important accurately make sure rest top fuselage plan tail joint centerline correct before cement dries remaining top bottom cross pieces now cut length glued place upper part cabin tricky said before some suggestions given Stringers should hard balsa prevent unsightly bowing shrinkage covering r FOR SHARK 60 OWNERS. Stahl design see tocal hobby dealer - 4 RUBBER & CO2 OGA *109 und AWINNERAT THE 5OIhNATS V t 4Oyeors ago Send tree brochure 10% FOR PACKING AND POSTAGE VA RESIDENTS ADD 4% TAD 22 I/2 WINGSPAN 6695 nose block pieces should glued place before final shaping Just sure true sand rear front faces pieces before commit yourself Start side blocks see comment below engine installation glue projecting top longeron bulkhead 1-B glue front block finally bottom block Note first trimmed fit inside surface some what cut away lightness before located engine mounting differs original model beam mounts Since engine mounted well forward FLYLINE 10643 ASHBY FL MODELS FAIRFAX VA 22030 front cabin bulkhead small ply wood firewall cut out per plans located means two balsa rectan gular pieces grain fore aft shown Blind nuts make easy bolt engine place remove make thrustline adjustments placing thin washers metal shims between case fire wallaccording adjustment needs would well coat interior engine compartment epoxy protect absorbing fuel exhaust wastes Covering Important note skele ton photos show straight dihedral finished wing has elliptical dihedral April 1977 95 O3 Notr novice flyers RO PRODUCTS INCORPORATED 480 Benner Read Waucenda IllInels 60084 USA 24 l/2 WINGSPAN 28 WINGSPAN S6
Edition: Model Aviation - 1977/04
Page Numbers: 39, 94, 95
Indoor Bud Tenny TRULY COMPETITIVE activity kind model flying requires careful atten tion detail especially true indoor models time model flown things must exactly right model give its best performance wing incidence right tiny fraction degree change incidence will make noticeable difference performance yet 1/16 change incidence degree wing 3 wide change props super FAI ship does new prop weigh same old change prop weight aver age FAI indoor model will shift center gravity about oz weight change Does explain super model suddenly started flying like lead sled Check List time model flown things should carefully checked before flight before leaving home 1 Are repairs made re suIt previous flying sessions 2 Assemble model completely examine washin/washout stab tilt rudder setting Bounce model lightly moving up down enough stress bracing slightly look changes wing alignment loose wires 3 Locate repair tiny holes microfilm especially prop 4 Check thrust bearing rear hook sure securethese parts take terrific stress under full turns 5 Be sure wing incidence correct several models same box sure proper parts get gether have prop planned 6 Be sure have intended rubber motor making new motors sure size batch rubber used source 7 Know much power torque needed flying restricted ceil ings both maximize performance prevent hangups model damage 8 When making flight trim adjust ments change thing time keep appropriate records verify performance changes Built-in Reliability flier wins lot probably has reliable model well trimmed thoroughly checked number building design practices help create reliable models sel dom need changes trim 1 Wing sockets should have balsa plug bottom wing posts can bottom out against plugs Change wing incidence cutting tiny pieces off end post use fin gernail clippers always push post way post should snug fit socket prevent flight loads pulling post out socket 2 Always sure wing sockets parallel other wing has same washin/washout model bracing jig packing jig holds wing storage box bottom end socket must glued mo torstick wing will shift around flight 3 The wing posts cabane must strong enough handle flight ground handling loads Otherwise model will inconsistent Continued page 94 I I IIi I I I I I ~i\jRIe SPAR FIG I / SPAR FORM flr~ FIG 2 SPAR FIG3 FIG 4 Fig 1 Wing jig can posterboard cut outline shape notches give room glue ribs place Fig 2 Pin narrow balsa strips place wedging action through wood Fig 3 An angle splice makes strong light joint Fig 4 compression rib bottom gives added strength critical points wing April 1977 39 Fig 5 same jig can used building covering microfilm wing solid ribs support single ribs during covering Chilton pic Fig 6 Stan Chilton uses same Easy-B jig building covering attaching wing posts Slot allows post alignment Chilton pic nearing end read havent started new ship next season could well advised look partial kits produced P & W Model Service PO Box 925 Monrovia CA 91016 Schmidt Custom Kits 11948 Franklin Blvd Elk Grove CA 95624 Clipper built P & W par tial kit John Pond plans couldnt believe low price such quality product kit consisted ribs wing stab tips rudder outline curved fuselage parts plus plywood firewall P & W stocks variety popular designs Schmidt Custom will supply partial kits nearly design custom basis Prices right Write lists OT Event Month Rubber Rubber power began still offers challenging satisfying di version Old-Timer enthusiasts fly rubber events Prior introduc tion gas engine rubber models reached considerable sophistication early Zaic yearbooks provide wealth still pertinent information well multitude designs de signs look right home coitest field today Several fact could pass Coupe dHivers SAM rules call strict adherence original design means fold ing props allowed unless used original designs utilizing folders well single-blade prop avail able Prop carving builds character say rate mystery about prop carving removed Zaic yearbooks pitch determination basic theory modelers today feel qual ity rubber 30s better what currently available Having little experience old stock am no position comment However no limits amount rubber allowed duplicate performance should achiev able experimental nature models employing two motors gearing single prop available Old-Timer enthusiast Some systems quite elaborate yet easily fabricated modelers work shop Braided motors another interesting aspect technique developed means combining long running time long motor power burst short motor thereby hopefully obtaining best both worlds Rubber models require fussing perhaps gas models rubber re quires frequent washing eliminate grit lubrication improve life perform ance inspection detect impending fail ure effort prevent exposure heat sunlight regimented preflight proce dure insure proper power under ever present possibility bursting motor destroying model sounds rather formidable actuality great relaxation free dif ficulties locating procuring ig nition engine dont have oil over model days end Clarence Haught Route 5 Box 16 Coeur dA lene ID 83814 FF Indoor/Tenny Continued page 39 may handle high power tur bulent air 4 Use adequate reinforcement around thrust bearing have adequate clearance between motorstick motor Full-power hookups se verely stress front motorstick rubbing knots kill climb and/or wreck stick rubbing through wood 5 Color-code parts model including prop different props used same model sure prop weighs same others Mark props identify pitch different pitch props used 6 Keep careful records model per formance enough detail able repeat good performances 7 If possible test batch rubber keep track motor us ing small marked envelopes sure return motor its home after use different batches vary widely quality important know lind rubber using possible allow crum rubber motor unknown quality sure give nasty surprise 8 Build fly particular design enough learn its strengths weaknesses Take care make successive model design iden tical possible previous models use patterns templates insure uniformity Keep records compo nent weights guide future decisions building remember structure too light hold its shape properly will contribute inconsis tent performance 9 Be aware relationship between models center gravity center motor two points very far apart changing weight rubber will cause models center gravity shift Model Assembly Jigs basic door model jig after prop block cov ered previous columns wing stab outline jig its simplest form outline jig thin cardboard posterboard cut just small enough fit inside wing stab outline Fig 1 Notches 94 Model Aviation STOP ON COMMAND FRICTION BRAKE Complete 10 po nose wheel brake linkage hook-up Features NEW case hardened steel brake drum other fine quality parts Requires very little pressure engage NO 1 57 $2 95 Wh.I ING GEAR STRAPS eofsteel-light strong Includes 4 Straps -iTNO~88 Screws DU BRO UCTS INC 480 BONNER ROAD WAUCONDA ILL 60084DU cut perimeter give clearance ribs attach outline expanded view Fig 1 Careful work allows wing stab essentially identical previous ones except chance tentional variations wood thickness grade use form first shape curved portions outline wrap ping moist balsa strips proper size around identically shaped tip form baking oven set low heat Straight portions outline laid place straight pins holding against form Fig 2 shows delicate strips held placenever pin through wood Use angle splice Fig 3 join curved portions straight sec tions using care avoid glueing strips form Finally ribs cut exact length glued place Variations Theme compression ribs Fig 4 used form must slotted entire length rib shown Fig 5 dark lines appear between solid rib supports jig shown Fig 5 used both building wing covering solid ribs support standard ribs during covering opera tion prevent pressure micro film distorting ribs Another vari ation shown Fig 6 Easy B jig al lows wing built dihedral already installed covered wing posts attached slot supporting frame allows posts visually aligned similar arrangement can used bracingwhich would allow wing completed before ever removed work surface very careful work extremely accurate con struction wings can made Bud Tenny P 0 Box 545 Richardson TX 75080 Answer Continued page 43 fuselage upside down bench check its alignment Weigh down much necessary hold true against surface put weight top longerons nearest bench Other cross pieces forward TE station now inserted dry sides pulled together rear cementednote beveled joint important accurately make sure rest top fuselage plan tail joint centerline correct before cement dries remaining top bottom cross pieces now cut length glued place upper part cabin tricky said before some suggestions given Stringers should hard balsa prevent unsightly bowing shrinkage covering r FOR SHARK 60 OWNERS. Stahl design see tocal hobby dealer - 4 RUBBER & CO2 OGA *109 und AWINNERAT THE 5OIhNATS V t 4Oyeors ago Send tree brochure 10% FOR PACKING AND POSTAGE VA RESIDENTS ADD 4% TAD 22 I/2 WINGSPAN 6695 nose block pieces should glued place before final shaping Just sure true sand rear front faces pieces before commit yourself Start side blocks see comment below engine installation glue projecting top longeron bulkhead 1-B glue front block finally bottom block Note first trimmed fit inside surface some what cut away lightness before located engine mounting differs original model beam mounts Since engine mounted well forward FLYLINE 10643 ASHBY FL MODELS FAIRFAX VA 22030 front cabin bulkhead small ply wood firewall cut out per plans located means two balsa rectan gular pieces grain fore aft shown Blind nuts make easy bolt engine place remove make thrustline adjustments placing thin washers metal shims between case fire wallaccording adjustment needs would well coat interior engine compartment epoxy protect absorbing fuel exhaust wastes Covering Important note skele ton photos show straight dihedral finished wing has elliptical dihedral April 1977 95 O3 Notr novice flyers RO PRODUCTS INCORPORATED 480 Benner Read Waucenda IllInels 60084 USA 24 l/2 WINGSPAN 28 WINGSPAN S6