For rubber-powered Scale design large enough use scale-position framework yet fly like bird Nesmith Cougar THE COUGAR two-seat home-built craft designed constructed Robert Nesmith made order Rubber Power Scale events full-size Cougar simply constructed model fol lows scale framework top Scale Fidelity points ship possesses fuse lage length almost long its wing span means long powerful motor can used extended prop run fuse lage nothing box four stringers wings tail surfaces have scale number ribs duplicate full-size spacing prototype has taken first 1971 Cleveland Junior Air Races sec ond 1972 Junior Air Races seventh 1971 Erie PA Model Air craft Assoc Scale Meet should pointed out Erie meet flying Aces rules used rules give 15-point bonus low-wing ships deduct five points high-wing model 20-point handicap together no points scale framework rib spac ing cause low placing contest Cougar three official flights 35 37 38 seconds 15- 20-mph winds Normal flight times about 45 seconds original weighs seven ounces could built lighter set three-view drawings James Triggs photos including color cover picture February 1959 issue American Aircraft Modeler model -size 1 1 scale model spans 30/s Theodore C Russell Construction Fuselage Construction begins build ing two fuselage sides joining cross pieces Note top fuselage wider bottom Short alsa strips used gussets maintain correct cross section installed sides being joined See reference cross sections plans tail wheel wire strut bent bound conventional cabin monoplane Cougar manages look nfreshingly differentnot like familiar Cubs Aeroncas Model has flown 38 seconds 15-20 mph winds cemented sq strip cemented tail post side bot tom stringers added now top stringer attached until wing center section mated cabin top Notch stringers necessary maintain right height above basic frame Cement hard sheet rear motor peg mounts Face side res 1/32 plywood 1/16 dia landing gear wire strut can bent ti shape now bound cemented LG mount whole assembly glued front fuse lage box Make hole i num tubing strut socket proper place glue tubing place Wing wing built first piece dihedral angle built After center section cemented top fuselage wing panels cut loose Lay LE bottom spar TE plan cement ribs except dihedral joints Glue top spar except dihedral breaks framework dry prop up tips di hedral angle 1/s leaving center section flat cement center joints LE TE bottom spar Make two pairs #1 ribs Drill pair locating dowels clamped together accuracy Put 1/16 scrap spacer between ribs set will replaced later two 1/32 ply wood cap ribs Cement rib pairs place dihedral breaks Glue locating dowels solidly center sec tion rib inside rib set Now finish up top spar 30 Model Aviation wide fuselage consists four longe rons stringers removable wing panels butt against cabin sides scale position wing ribs show clearly photo Make two wing struts hard / x 1A balsa groove 1/32 wire insert Cement wire place rein force strip silk Position wings fuselage lined up right angles fuselage centerline glue wing securely fuselage After dries slip short lengths 1/32 ID aluminum tubing strut ends set place Hold position rubber band through fuselage socket tube Cement tubing strut end hard balsa mount wing careful get glue side tubing cement dry remove struts cut wing panels center section method assembly insures removable wing panels correct incidence dihedral angles after being cut free fuselage Sew strut tubing its mount cement again make secure Sand LEs shape add 1/32 sheet Drawing proof scale WING SPAN-20 -5 ENGINE85l15 HP 64 ME TAL PROP FIBERGLASS NOSE COWL 7 LANDING LIGHT & PITOT TUBELEFT WING ONLY 1 DIHEDRAL CONSTRUCTION WWIGS-WOOD SPARS & RIBS FABRIC COVERING FUSELAGE & TAIL SURFACESSTEEL TUBE FABRIC COVERING HIS VIEW TOP RIGHT SIDE ______ THIS VIEW ______ BOTTOM RIGHT ______ SIDE QLOBz YELLOW WITH BLACK TRIM 7 t TORSION BAR LANDING BC ABC D D F E E BLACK ABC VENT FRTAL COWL PANELSBCEF ROBERT NESMITHS COUGAR 0246ORAWN FOR MODEL AVIATION BY TED RUSSELL July1976 31 simple basic structure makes model easy conStruct RC typesand othersshould encouraged scale up needs Nesmith Cougar balsa top spar forward 1/32 ply cap ribs should added now tips roots center section Finishing Make sure framework sanded smooth dope four coats clear dope wherever tissue will attached Cover yellow Japanese tissue Lay tissue place fasten mixture 50/50 clear dope thinner Apply top tissue work through tissue fingers adhere dope framework Cover top fuselage center section black tissue Japanese tissue available use 00 grade Silkspan dyed Rit clothing dye before covering entire ship covered fuselage Sand entire wings smooth sand outer ribs slightly match TE taper Add top fuselage center stringer rudder post cen ter false rib lB Notch rib accept stringer Tail Surfaces tail surfaces built flat over plans using wood sizes shown After frames dry cement 1/16 sq balsa strips side shown Sand strips symmetrical section difference between stab fin rudder section cut free hinged fin soft wire aluminum strips turn adjust ment original fixed fin recommend adjustable rudder Noae Section Make front nose block l/l6 plywood 14ff sq 1/4 x ps laminated front plywood Add hard sheet balsa plug rear Cut both nose block sides top hard sheet Note right side slightly shorter left because built-in right thrust Cut bottom piece hard t balsa Cement blocks together match fuselage box rear nose block front dry groove back nose assembly fit over landing gear wire cement unit solidly front fuselage Make up rounded nose button hard cross grained t balsa glue place Drill hole approximate angles shown either bush 1/16 ID brass tubing cement washers eyelets front rear nose block Propeller Cut propeller blank shape using hard balsa Carve spinner shape shown hard balsa block fit over prop blank Mark spinner position prop re move spinner carve propeller blades marks out tips Make about 3/32 undercamber blades Glue prop spinner together Bush shaft hole 1/16 ID eye lets inside 3/32 ID brass tubing original prop freewheeling blades hinged fold hard land ings flight blades held straight short rubber bands brush coat clear dope Now cut license numbers side fuselage rudder color patterns black tissue Attach proper positions straight thinner Brush two coats half dope half thinner fuselage wings coat tail surfaces Install 1/16 cabin windshield dowels Dope 1/16 dowels silver ls black Make wind shield heavy celluloid side windows light celluloid Use tissue strips over balsa window framework Add black tis sue strip center windshield also Make landing gear struts hard balsa Groove struts cement land ing gear wire Reinforce strip silk cover yellow tissue Also cover wing struts yellow tissue Make air intake cover tissue mount position Make exhaust stacks dope flat black mount Line up stab fuselage slot making sure straight cement place Cement fin position again making sure straight Bend prop shaft 1/16 dia wire winding hook front Put flat washer ball-bearing washer another flat washer between pro peller nose block Make wheels hard sheet laminated crossgrain Install bushings axles fill grain sanding sealer Dope tires flat black hubs yellow stall main wheels soldered wash ers #0 brass washers model railroad department Cement tail wheel directly wire strut does revolve Put wing struts place short rubber bands through fuselage tube Attach wings short rubber bands through center section paper tube slip wire strut ends tubing wings Make up motor six strands Pirelli rubber 20 24 long Install motor check models balance should balance about 9/16 front main spar Add weight nose tail get indicated balance point Mine took just small amount nose weight Hand glide over tall grass make sure no bad stall dive add weight appropriate place cure Start few winds slowly increase power Shim nose block side- down-thrust keep away power stall Use hinged rudder glide turn Make final weight adjustments fiat glide original wide right power cir cle turned left glide could probably turn right glide too put slight amount wash-in right wing panel may have use eight strands rubber windy conditions punch through turbulence get altitude model very steady wind Since fuselage almost long wings abnormally long rubber motor can used obtain long power runs Although author did use free-wheeling worked out rubber-loaded hinged prop blades avoid breakage TIP LIGHT1/32 3-I 1/16 HARD SH LEFT WING NEDTCP ONLY RIGHT WWE GREEN 1/B SH TIP RIB TAB-LEFT VANSY 41/ASH P1123 NOSE VIEW j1/BB-4RIBE 4-F 1/16 SH INSET BETWEEN TOP LONGEBONS II ____/ 4 1/43-1 TOP1/1BDOVEL HEAW CELLUDD 1/B Dowa SEE NOSE VIEW AND SECTOR1 // 1/ 1/ASH SEES 1/41 3/B SH BOTTONI 01 23 45B 'BALSA I SCALEIHTHES 32 Model Aviation STRUT NCIJAT 210 AIiM TE n 74 2M1SIc V/RE I-4TOK T pK_ 1/BOA LOCAThG/ELS GWE 10 CENTER SEOSON N1132RYR18S63 I______10 MAICHFLAP UNE IB4-1/16 SI-I & 16-1/32 SI-I RECCj 1/16x1/B BBS CAP FUSELAGE SHOWN V4TH 0431-ED / BN10P NQ 1I1Bd/B RIB CAP WITH 1/16 SD __1/B SO III1/SI SO LE~rliS SD SPAR 1/B SO lOP LONGERON\JliB TE /32 PLY RB 4 REDO 63 NSTAJI REDE AFTER WIG CENTERYRCAL STAB AND RN SECTER/16 B SECTOP S N PLACE1/B SI-IC/BSO/V4TH /1650 _______/lBx BB SD SPAN 1/32 PIN BER /iec ATE AB 1/8 50 LD1GEROIIS 118 S 1/16x1SI TYP I 1/8 50 VERT --V16SI-4 SECIlON CC 1Exl/4 SPRUCE r 1/B PLY GEAR MOIBIT 1/16 SH HALF-RIBS63 132 RN RIB\TBE BE0I-O j1/SI SH DOE/EL lie SO 1/B SO VENT TYP SD BALSA WRE 1/B SMh1I/AFTER CARViNG ~JJCUT 10 TTED LIES ________1/40A ALAN TL UM TUBE STRUT SOCPET1/8 SDIIIII HARD BALSA r ____________ TYP SHAPED NESMITH COUGAR RUBBER SCALE ay THDOE C EJSSL Niwd Blonchord Mordi 168 July1976 33 r1 SH R99323/BI-LViID BALSA SPAR DIIEIAL AND /1/16 SH RIBS1/B3I16 LE3/3250 SPARRN SEFBR6YION OP RIJELSTP CAP ROIED PAPER TLEE IIZ4JTZZ 1/B 50 OLAGONALS /rSTE SOOKET
Edition: Model Aviation - 1976/07
Page Numbers: 30, 31, 32, 33
For rubber-powered Scale design large enough use scale-position framework yet fly like bird Nesmith Cougar THE COUGAR two-seat home-built craft designed constructed Robert Nesmith made order Rubber Power Scale events full-size Cougar simply constructed model fol lows scale framework top Scale Fidelity points ship possesses fuse lage length almost long its wing span means long powerful motor can used extended prop run fuse lage nothing box four stringers wings tail surfaces have scale number ribs duplicate full-size spacing prototype has taken first 1971 Cleveland Junior Air Races sec ond 1972 Junior Air Races seventh 1971 Erie PA Model Air craft Assoc Scale Meet should pointed out Erie meet flying Aces rules used rules give 15-point bonus low-wing ships deduct five points high-wing model 20-point handicap together no points scale framework rib spac ing cause low placing contest Cougar three official flights 35 37 38 seconds 15- 20-mph winds Normal flight times about 45 seconds original weighs seven ounces could built lighter set three-view drawings James Triggs photos including color cover picture February 1959 issue American Aircraft Modeler model -size 1 1 scale model spans 30/s Theodore C Russell Construction Fuselage Construction begins build ing two fuselage sides joining cross pieces Note top fuselage wider bottom Short alsa strips used gussets maintain correct cross section installed sides being joined See reference cross sections plans tail wheel wire strut bent bound conventional cabin monoplane Cougar manages look nfreshingly differentnot like familiar Cubs Aeroncas Model has flown 38 seconds 15-20 mph winds cemented sq strip cemented tail post side bot tom stringers added now top stringer attached until wing center section mated cabin top Notch stringers necessary maintain right height above basic frame Cement hard sheet rear motor peg mounts Face side res 1/32 plywood 1/16 dia landing gear wire strut can bent ti shape now bound cemented LG mount whole assembly glued front fuse lage box Make hole i num tubing strut socket proper place glue tubing place Wing wing built first piece dihedral angle built After center section cemented top fuselage wing panels cut loose Lay LE bottom spar TE plan cement ribs except dihedral joints Glue top spar except dihedral breaks framework dry prop up tips di hedral angle 1/s leaving center section flat cement center joints LE TE bottom spar Make two pairs #1 ribs Drill pair locating dowels clamped together accuracy Put 1/16 scrap spacer between ribs set will replaced later two 1/32 ply wood cap ribs Cement rib pairs place dihedral breaks Glue locating dowels solidly center sec tion rib inside rib set Now finish up top spar 30 Model Aviation wide fuselage consists four longe rons stringers removable wing panels butt against cabin sides scale position wing ribs show clearly photo Make two wing struts hard / x 1A balsa groove 1/32 wire insert Cement wire place rein force strip silk Position wings fuselage lined up right angles fuselage centerline glue wing securely fuselage After dries slip short lengths 1/32 ID aluminum tubing strut ends set place Hold position rubber band through fuselage socket tube Cement tubing strut end hard balsa mount wing careful get glue side tubing cement dry remove struts cut wing panels center section method assembly insures removable wing panels correct incidence dihedral angles after being cut free fuselage Sew strut tubing its mount cement again make secure Sand LEs shape add 1/32 sheet Drawing proof scale WING SPAN-20 -5 ENGINE85l15 HP 64 ME TAL PROP FIBERGLASS NOSE COWL 7 LANDING LIGHT & PITOT TUBELEFT WING ONLY 1 DIHEDRAL CONSTRUCTION WWIGS-WOOD SPARS & RIBS FABRIC COVERING FUSELAGE & TAIL SURFACESSTEEL TUBE FABRIC COVERING HIS VIEW TOP RIGHT SIDE ______ THIS VIEW ______ BOTTOM RIGHT ______ SIDE QLOBz YELLOW WITH BLACK TRIM 7 t TORSION BAR LANDING BC ABC D D F E E BLACK ABC VENT FRTAL COWL PANELSBCEF ROBERT NESMITHS COUGAR 0246ORAWN FOR MODEL AVIATION BY TED RUSSELL July1976 31 simple basic structure makes model easy conStruct RC typesand othersshould encouraged scale up needs Nesmith Cougar balsa top spar forward 1/32 ply cap ribs should added now tips roots center section Finishing Make sure framework sanded smooth dope four coats clear dope wherever tissue will attached Cover yellow Japanese tissue Lay tissue place fasten mixture 50/50 clear dope thinner Apply top tissue work through tissue fingers adhere dope framework Cover top fuselage center section black tissue Japanese tissue available use 00 grade Silkspan dyed Rit clothing dye before covering entire ship covered fuselage Sand entire wings smooth sand outer ribs slightly match TE taper Add top fuselage center stringer rudder post cen ter false rib lB Notch rib accept stringer Tail Surfaces tail surfaces built flat over plans using wood sizes shown After frames dry cement 1/16 sq balsa strips side shown Sand strips symmetrical section difference between stab fin rudder section cut free hinged fin soft wire aluminum strips turn adjust ment original fixed fin recommend adjustable rudder Noae Section Make front nose block l/l6 plywood 14ff sq 1/4 x ps laminated front plywood Add hard sheet balsa plug rear Cut both nose block sides top hard sheet Note right side slightly shorter left because built-in right thrust Cut bottom piece hard t balsa Cement blocks together match fuselage box rear nose block front dry groove back nose assembly fit over landing gear wire cement unit solidly front fuselage Make up rounded nose button hard cross grained t balsa glue place Drill hole approximate angles shown either bush 1/16 ID brass tubing cement washers eyelets front rear nose block Propeller Cut propeller blank shape using hard balsa Carve spinner shape shown hard balsa block fit over prop blank Mark spinner position prop re move spinner carve propeller blades marks out tips Make about 3/32 undercamber blades Glue prop spinner together Bush shaft hole 1/16 ID eye lets inside 3/32 ID brass tubing original prop freewheeling blades hinged fold hard land ings flight blades held straight short rubber bands brush coat clear dope Now cut license numbers side fuselage rudder color patterns black tissue Attach proper positions straight thinner Brush two coats half dope half thinner fuselage wings coat tail surfaces Install 1/16 cabin windshield dowels Dope 1/16 dowels silver ls black Make wind shield heavy celluloid side windows light celluloid Use tissue strips over balsa window framework Add black tis sue strip center windshield also Make landing gear struts hard balsa Groove struts cement land ing gear wire Reinforce strip silk cover yellow tissue Also cover wing struts yellow tissue Make air intake cover tissue mount position Make exhaust stacks dope flat black mount Line up stab fuselage slot making sure straight cement place Cement fin position again making sure straight Bend prop shaft 1/16 dia wire winding hook front Put flat washer ball-bearing washer another flat washer between pro peller nose block Make wheels hard sheet laminated crossgrain Install bushings axles fill grain sanding sealer Dope tires flat black hubs yellow stall main wheels soldered wash ers #0 brass washers model railroad department Cement tail wheel directly wire strut does revolve Put wing struts place short rubber bands through fuselage tube Attach wings short rubber bands through center section paper tube slip wire strut ends tubing wings Make up motor six strands Pirelli rubber 20 24 long Install motor check models balance should balance about 9/16 front main spar Add weight nose tail get indicated balance point Mine took just small amount nose weight Hand glide over tall grass make sure no bad stall dive add weight appropriate place cure Start few winds slowly increase power Shim nose block side- down-thrust keep away power stall Use hinged rudder glide turn Make final weight adjustments fiat glide original wide right power cir cle turned left glide could probably turn right glide too put slight amount wash-in right wing panel may have use eight strands rubber windy conditions punch through turbulence get altitude model very steady wind Since fuselage almost long wings abnormally long rubber motor can used obtain long power runs Although author did use free-wheeling worked out rubber-loaded hinged prop blades avoid breakage TIP LIGHT1/32 3-I 1/16 HARD SH LEFT WING NEDTCP ONLY RIGHT WWE GREEN 1/B SH TIP RIB TAB-LEFT VANSY 41/ASH P1123 NOSE VIEW j1/BB-4RIBE 4-F 1/16 SH INSET BETWEEN TOP LONGEBONS II ____/ 4 1/43-1 TOP1/1BDOVEL HEAW CELLUDD 1/B Dowa SEE NOSE VIEW AND SECTOR1 // 1/ 1/ASH SEES 1/41 3/B SH BOTTONI 01 23 45B 'BALSA I SCALEIHTHES 32 Model Aviation STRUT NCIJAT 210 AIiM TE n 74 2M1SIc V/RE I-4TOK T pK_ 1/BOA LOCAThG/ELS GWE 10 CENTER SEOSON N1132RYR18S63 I______10 MAICHFLAP UNE IB4-1/16 SI-I & 16-1/32 SI-I RECCj 1/16x1/B BBS CAP FUSELAGE SHOWN V4TH 0431-ED / BN10P NQ 1I1Bd/B RIB CAP WITH 1/16 SD __1/B SO III1/SI SO LE~rliS SD SPAR 1/B SO lOP LONGERON\JliB TE /32 PLY RB 4 REDO 63 NSTAJI REDE AFTER WIG CENTERYRCAL STAB AND RN SECTER/16 B SECTOP S N PLACE1/B SI-IC/BSO/V4TH /1650 _______/lBx BB SD SPAN 1/32 PIN BER /iec ATE AB 1/8 50 LD1GEROIIS 118 S 1/16x1SI TYP I 1/8 50 VERT --V16SI-4 SECIlON CC 1Exl/4 SPRUCE r 1/B PLY GEAR MOIBIT 1/16 SH HALF-RIBS63 132 RN RIB\TBE BE0I-O j1/SI SH DOE/EL lie SO 1/B SO VENT TYP SD BALSA WRE 1/B SMh1I/AFTER CARViNG ~JJCUT 10 TTED LIES ________1/40A ALAN TL UM TUBE STRUT SOCPET1/8 SDIIIII HARD BALSA r ____________ TYP SHAPED NESMITH COUGAR RUBBER SCALE ay THDOE C EJSSL Niwd Blonchord Mordi 168 July1976 33 r1 SH R99323/BI-LViID BALSA SPAR DIIEIAL AND /1/16 SH RIBS1/B3I16 LE3/3250 SPARRN SEFBR6YION OP RIJELSTP CAP ROIED PAPER TLEE IIZ4JTZZ 1/B 50 OLAGONALS /rSTE SOOKET
Edition: Model Aviation - 1976/07
Page Numbers: 30, 31, 32, 33
For rubber-powered Scale design large enough use scale-position framework yet fly like bird Nesmith Cougar THE COUGAR two-seat home-built craft designed constructed Robert Nesmith made order Rubber Power Scale events full-size Cougar simply constructed model fol lows scale framework top Scale Fidelity points ship possesses fuse lage length almost long its wing span means long powerful motor can used extended prop run fuse lage nothing box four stringers wings tail surfaces have scale number ribs duplicate full-size spacing prototype has taken first 1971 Cleveland Junior Air Races sec ond 1972 Junior Air Races seventh 1971 Erie PA Model Air craft Assoc Scale Meet should pointed out Erie meet flying Aces rules used rules give 15-point bonus low-wing ships deduct five points high-wing model 20-point handicap together no points scale framework rib spac ing cause low placing contest Cougar three official flights 35 37 38 seconds 15- 20-mph winds Normal flight times about 45 seconds original weighs seven ounces could built lighter set three-view drawings James Triggs photos including color cover picture February 1959 issue American Aircraft Modeler model -size 1 1 scale model spans 30/s Theodore C Russell Construction Fuselage Construction begins build ing two fuselage sides joining cross pieces Note top fuselage wider bottom Short alsa strips used gussets maintain correct cross section installed sides being joined See reference cross sections plans tail wheel wire strut bent bound conventional cabin monoplane Cougar manages look nfreshingly differentnot like familiar Cubs Aeroncas Model has flown 38 seconds 15-20 mph winds cemented sq strip cemented tail post side bot tom stringers added now top stringer attached until wing center section mated cabin top Notch stringers necessary maintain right height above basic frame Cement hard sheet rear motor peg mounts Face side res 1/32 plywood 1/16 dia landing gear wire strut can bent ti shape now bound cemented LG mount whole assembly glued front fuse lage box Make hole i num tubing strut socket proper place glue tubing place Wing wing built first piece dihedral angle built After center section cemented top fuselage wing panels cut loose Lay LE bottom spar TE plan cement ribs except dihedral joints Glue top spar except dihedral breaks framework dry prop up tips di hedral angle 1/s leaving center section flat cement center joints LE TE bottom spar Make two pairs #1 ribs Drill pair locating dowels clamped together accuracy Put 1/16 scrap spacer between ribs set will replaced later two 1/32 ply wood cap ribs Cement rib pairs place dihedral breaks Glue locating dowels solidly center sec tion rib inside rib set Now finish up top spar 30 Model Aviation wide fuselage consists four longe rons stringers removable wing panels butt against cabin sides scale position wing ribs show clearly photo Make two wing struts hard / x 1A balsa groove 1/32 wire insert Cement wire place rein force strip silk Position wings fuselage lined up right angles fuselage centerline glue wing securely fuselage After dries slip short lengths 1/32 ID aluminum tubing strut ends set place Hold position rubber band through fuselage socket tube Cement tubing strut end hard balsa mount wing careful get glue side tubing cement dry remove struts cut wing panels center section method assembly insures removable wing panels correct incidence dihedral angles after being cut free fuselage Sew strut tubing its mount cement again make secure Sand LEs shape add 1/32 sheet Drawing proof scale WING SPAN-20 -5 ENGINE85l15 HP 64 ME TAL PROP FIBERGLASS NOSE COWL 7 LANDING LIGHT & PITOT TUBELEFT WING ONLY 1 DIHEDRAL CONSTRUCTION WWIGS-WOOD SPARS & RIBS FABRIC COVERING FUSELAGE & TAIL SURFACESSTEEL TUBE FABRIC COVERING HIS VIEW TOP RIGHT SIDE ______ THIS VIEW ______ BOTTOM RIGHT ______ SIDE QLOBz YELLOW WITH BLACK TRIM 7 t TORSION BAR LANDING BC ABC D D F E E BLACK ABC VENT FRTAL COWL PANELSBCEF ROBERT NESMITHS COUGAR 0246ORAWN FOR MODEL AVIATION BY TED RUSSELL July1976 31 simple basic structure makes model easy conStruct RC typesand othersshould encouraged scale up needs Nesmith Cougar balsa top spar forward 1/32 ply cap ribs should added now tips roots center section Finishing Make sure framework sanded smooth dope four coats clear dope wherever tissue will attached Cover yellow Japanese tissue Lay tissue place fasten mixture 50/50 clear dope thinner Apply top tissue work through tissue fingers adhere dope framework Cover top fuselage center section black tissue Japanese tissue available use 00 grade Silkspan dyed Rit clothing dye before covering entire ship covered fuselage Sand entire wings smooth sand outer ribs slightly match TE taper Add top fuselage center stringer rudder post cen ter false rib lB Notch rib accept stringer Tail Surfaces tail surfaces built flat over plans using wood sizes shown After frames dry cement 1/16 sq balsa strips side shown Sand strips symmetrical section difference between stab fin rudder section cut free hinged fin soft wire aluminum strips turn adjust ment original fixed fin recommend adjustable rudder Noae Section Make front nose block l/l6 plywood 14ff sq 1/4 x ps laminated front plywood Add hard sheet balsa plug rear Cut both nose block sides top hard sheet Note right side slightly shorter left because built-in right thrust Cut bottom piece hard t balsa Cement blocks together match fuselage box rear nose block front dry groove back nose assembly fit over landing gear wire cement unit solidly front fuselage Make up rounded nose button hard cross grained t balsa glue place Drill hole approximate angles shown either bush 1/16 ID brass tubing cement washers eyelets front rear nose block Propeller Cut propeller blank shape using hard balsa Carve spinner shape shown hard balsa block fit over prop blank Mark spinner position prop re move spinner carve propeller blades marks out tips Make about 3/32 undercamber blades Glue prop spinner together Bush shaft hole 1/16 ID eye lets inside 3/32 ID brass tubing original prop freewheeling blades hinged fold hard land ings flight blades held straight short rubber bands brush coat clear dope Now cut license numbers side fuselage rudder color patterns black tissue Attach proper positions straight thinner Brush two coats half dope half thinner fuselage wings coat tail surfaces Install 1/16 cabin windshield dowels Dope 1/16 dowels silver ls black Make wind shield heavy celluloid side windows light celluloid Use tissue strips over balsa window framework Add black tis sue strip center windshield also Make landing gear struts hard balsa Groove struts cement land ing gear wire Reinforce strip silk cover yellow tissue Also cover wing struts yellow tissue Make air intake cover tissue mount position Make exhaust stacks dope flat black mount Line up stab fuselage slot making sure straight cement place Cement fin position again making sure straight Bend prop shaft 1/16 dia wire winding hook front Put flat washer ball-bearing washer another flat washer between pro peller nose block Make wheels hard sheet laminated crossgrain Install bushings axles fill grain sanding sealer Dope tires flat black hubs yellow stall main wheels soldered wash ers #0 brass washers model railroad department Cement tail wheel directly wire strut does revolve Put wing struts place short rubber bands through fuselage tube Attach wings short rubber bands through center section paper tube slip wire strut ends tubing wings Make up motor six strands Pirelli rubber 20 24 long Install motor check models balance should balance about 9/16 front main spar Add weight nose tail get indicated balance point Mine took just small amount nose weight Hand glide over tall grass make sure no bad stall dive add weight appropriate place cure Start few winds slowly increase power Shim nose block side- down-thrust keep away power stall Use hinged rudder glide turn Make final weight adjustments fiat glide original wide right power cir cle turned left glide could probably turn right glide too put slight amount wash-in right wing panel may have use eight strands rubber windy conditions punch through turbulence get altitude model very steady wind Since fuselage almost long wings abnormally long rubber motor can used obtain long power runs Although author did use free-wheeling worked out rubber-loaded hinged prop blades avoid breakage TIP LIGHT1/32 3-I 1/16 HARD SH LEFT WING NEDTCP ONLY RIGHT WWE GREEN 1/B SH TIP RIB TAB-LEFT VANSY 41/ASH P1123 NOSE VIEW j1/BB-4RIBE 4-F 1/16 SH INSET BETWEEN TOP LONGEBONS II ____/ 4 1/43-1 TOP1/1BDOVEL HEAW CELLUDD 1/B Dowa SEE NOSE VIEW AND SECTOR1 // 1/ 1/ASH SEES 1/41 3/B SH BOTTONI 01 23 45B 'BALSA I SCALEIHTHES 32 Model Aviation STRUT NCIJAT 210 AIiM TE n 74 2M1SIc V/RE I-4TOK T pK_ 1/BOA LOCAThG/ELS GWE 10 CENTER SEOSON N1132RYR18S63 I______10 MAICHFLAP UNE IB4-1/16 SI-I & 16-1/32 SI-I RECCj 1/16x1/B BBS CAP FUSELAGE SHOWN V4TH 0431-ED / BN10P NQ 1I1Bd/B RIB CAP WITH 1/16 SD __1/B SO III1/SI SO LE~rliS SD SPAR 1/B SO lOP LONGERON\JliB TE /32 PLY RB 4 REDO 63 NSTAJI REDE AFTER WIG CENTERYRCAL STAB AND RN SECTER/16 B SECTOP S N PLACE1/B SI-IC/BSO/V4TH /1650 _______/lBx BB SD SPAN 1/32 PIN BER /iec ATE AB 1/8 50 LD1GEROIIS 118 S 1/16x1SI TYP I 1/8 50 VERT --V16SI-4 SECIlON CC 1Exl/4 SPRUCE r 1/B PLY GEAR MOIBIT 1/16 SH HALF-RIBS63 132 RN RIB\TBE BE0I-O j1/SI SH DOE/EL lie SO 1/B SO VENT TYP SD BALSA WRE 1/B SMh1I/AFTER CARViNG ~JJCUT 10 TTED LIES ________1/40A ALAN TL UM TUBE STRUT SOCPET1/8 SDIIIII HARD BALSA r ____________ TYP SHAPED NESMITH COUGAR RUBBER SCALE ay THDOE C EJSSL Niwd Blonchord Mordi 168 July1976 33 r1 SH R99323/BI-LViID BALSA SPAR DIIEIAL AND /1/16 SH RIBS1/B3I16 LE3/3250 SPARRN SEFBR6YION OP RIJELSTP CAP ROIED PAPER TLEE IIZ4JTZZ 1/B 50 OLAGONALS /rSTE SOOKET
Edition: Model Aviation - 1976/07
Page Numbers: 30, 31, 32, 33
For rubber-powered Scale design large enough use scale-position framework yet fly like bird Nesmith Cougar THE COUGAR two-seat home-built craft designed constructed Robert Nesmith made order Rubber Power Scale events full-size Cougar simply constructed model fol lows scale framework top Scale Fidelity points ship possesses fuse lage length almost long its wing span means long powerful motor can used extended prop run fuse lage nothing box four stringers wings tail surfaces have scale number ribs duplicate full-size spacing prototype has taken first 1971 Cleveland Junior Air Races sec ond 1972 Junior Air Races seventh 1971 Erie PA Model Air craft Assoc Scale Meet should pointed out Erie meet flying Aces rules used rules give 15-point bonus low-wing ships deduct five points high-wing model 20-point handicap together no points scale framework rib spac ing cause low placing contest Cougar three official flights 35 37 38 seconds 15- 20-mph winds Normal flight times about 45 seconds original weighs seven ounces could built lighter set three-view drawings James Triggs photos including color cover picture February 1959 issue American Aircraft Modeler model -size 1 1 scale model spans 30/s Theodore C Russell Construction Fuselage Construction begins build ing two fuselage sides joining cross pieces Note top fuselage wider bottom Short alsa strips used gussets maintain correct cross section installed sides being joined See reference cross sections plans tail wheel wire strut bent bound conventional cabin monoplane Cougar manages look nfreshingly differentnot like familiar Cubs Aeroncas Model has flown 38 seconds 15-20 mph winds cemented sq strip cemented tail post side bot tom stringers added now top stringer attached until wing center section mated cabin top Notch stringers necessary maintain right height above basic frame Cement hard sheet rear motor peg mounts Face side res 1/32 plywood 1/16 dia landing gear wire strut can bent ti shape now bound cemented LG mount whole assembly glued front fuse lage box Make hole i num tubing strut socket proper place glue tubing place Wing wing built first piece dihedral angle built After center section cemented top fuselage wing panels cut loose Lay LE bottom spar TE plan cement ribs except dihedral joints Glue top spar except dihedral breaks framework dry prop up tips di hedral angle 1/s leaving center section flat cement center joints LE TE bottom spar Make two pairs #1 ribs Drill pair locating dowels clamped together accuracy Put 1/16 scrap spacer between ribs set will replaced later two 1/32 ply wood cap ribs Cement rib pairs place dihedral breaks Glue locating dowels solidly center sec tion rib inside rib set Now finish up top spar 30 Model Aviation wide fuselage consists four longe rons stringers removable wing panels butt against cabin sides scale position wing ribs show clearly photo Make two wing struts hard / x 1A balsa groove 1/32 wire insert Cement wire place rein force strip silk Position wings fuselage lined up right angles fuselage centerline glue wing securely fuselage After dries slip short lengths 1/32 ID aluminum tubing strut ends set place Hold position rubber band through fuselage socket tube Cement tubing strut end hard balsa mount wing careful get glue side tubing cement dry remove struts cut wing panels center section method assembly insures removable wing panels correct incidence dihedral angles after being cut free fuselage Sew strut tubing its mount cement again make secure Sand LEs shape add 1/32 sheet Drawing proof scale WING SPAN-20 -5 ENGINE85l15 HP 64 ME TAL PROP FIBERGLASS NOSE COWL 7 LANDING LIGHT & PITOT TUBELEFT WING ONLY 1 DIHEDRAL CONSTRUCTION WWIGS-WOOD SPARS & RIBS FABRIC COVERING FUSELAGE & TAIL SURFACESSTEEL TUBE FABRIC COVERING HIS VIEW TOP RIGHT SIDE ______ THIS VIEW ______ BOTTOM RIGHT ______ SIDE QLOBz YELLOW WITH BLACK TRIM 7 t TORSION BAR LANDING BC ABC D D F E E BLACK ABC VENT FRTAL COWL PANELSBCEF ROBERT NESMITHS COUGAR 0246ORAWN FOR MODEL AVIATION BY TED RUSSELL July1976 31 simple basic structure makes model easy conStruct RC typesand othersshould encouraged scale up needs Nesmith Cougar balsa top spar forward 1/32 ply cap ribs should added now tips roots center section Finishing Make sure framework sanded smooth dope four coats clear dope wherever tissue will attached Cover yellow Japanese tissue Lay tissue place fasten mixture 50/50 clear dope thinner Apply top tissue work through tissue fingers adhere dope framework Cover top fuselage center section black tissue Japanese tissue available use 00 grade Silkspan dyed Rit clothing dye before covering entire ship covered fuselage Sand entire wings smooth sand outer ribs slightly match TE taper Add top fuselage center stringer rudder post cen ter false rib lB Notch rib accept stringer Tail Surfaces tail surfaces built flat over plans using wood sizes shown After frames dry cement 1/16 sq balsa strips side shown Sand strips symmetrical section difference between stab fin rudder section cut free hinged fin soft wire aluminum strips turn adjust ment original fixed fin recommend adjustable rudder Noae Section Make front nose block l/l6 plywood 14ff sq 1/4 x ps laminated front plywood Add hard sheet balsa plug rear Cut both nose block sides top hard sheet Note right side slightly shorter left because built-in right thrust Cut bottom piece hard t balsa Cement blocks together match fuselage box rear nose block front dry groove back nose assembly fit over landing gear wire cement unit solidly front fuselage Make up rounded nose button hard cross grained t balsa glue place Drill hole approximate angles shown either bush 1/16 ID brass tubing cement washers eyelets front rear nose block Propeller Cut propeller blank shape using hard balsa Carve spinner shape shown hard balsa block fit over prop blank Mark spinner position prop re move spinner carve propeller blades marks out tips Make about 3/32 undercamber blades Glue prop spinner together Bush shaft hole 1/16 ID eye lets inside 3/32 ID brass tubing original prop freewheeling blades hinged fold hard land ings flight blades held straight short rubber bands brush coat clear dope Now cut license numbers side fuselage rudder color patterns black tissue Attach proper positions straight thinner Brush two coats half dope half thinner fuselage wings coat tail surfaces Install 1/16 cabin windshield dowels Dope 1/16 dowels silver ls black Make wind shield heavy celluloid side windows light celluloid Use tissue strips over balsa window framework Add black tis sue strip center windshield also Make landing gear struts hard balsa Groove struts cement land ing gear wire Reinforce strip silk cover yellow tissue Also cover wing struts yellow tissue Make air intake cover tissue mount position Make exhaust stacks dope flat black mount Line up stab fuselage slot making sure straight cement place Cement fin position again making sure straight Bend prop shaft 1/16 dia wire winding hook front Put flat washer ball-bearing washer another flat washer between pro peller nose block Make wheels hard sheet laminated crossgrain Install bushings axles fill grain sanding sealer Dope tires flat black hubs yellow stall main wheels soldered wash ers #0 brass washers model railroad department Cement tail wheel directly wire strut does revolve Put wing struts place short rubber bands through fuselage tube Attach wings short rubber bands through center section paper tube slip wire strut ends tubing wings Make up motor six strands Pirelli rubber 20 24 long Install motor check models balance should balance about 9/16 front main spar Add weight nose tail get indicated balance point Mine took just small amount nose weight Hand glide over tall grass make sure no bad stall dive add weight appropriate place cure Start few winds slowly increase power Shim nose block side- down-thrust keep away power stall Use hinged rudder glide turn Make final weight adjustments fiat glide original wide right power cir cle turned left glide could probably turn right glide too put slight amount wash-in right wing panel may have use eight strands rubber windy conditions punch through turbulence get altitude model very steady wind Since fuselage almost long wings abnormally long rubber motor can used obtain long power runs Although author did use free-wheeling worked out rubber-loaded hinged prop blades avoid breakage TIP LIGHT1/32 3-I 1/16 HARD SH LEFT WING NEDTCP ONLY RIGHT WWE GREEN 1/B SH TIP RIB TAB-LEFT VANSY 41/ASH P1123 NOSE VIEW j1/BB-4RIBE 4-F 1/16 SH INSET BETWEEN TOP LONGEBONS II ____/ 4 1/43-1 TOP1/1BDOVEL HEAW CELLUDD 1/B Dowa SEE NOSE VIEW AND SECTOR1 // 1/ 1/ASH SEES 1/41 3/B SH BOTTONI 01 23 45B 'BALSA I SCALEIHTHES 32 Model Aviation STRUT NCIJAT 210 AIiM TE n 74 2M1SIc V/RE I-4TOK T pK_ 1/BOA LOCAThG/ELS GWE 10 CENTER SEOSON N1132RYR18S63 I______10 MAICHFLAP UNE IB4-1/16 SI-I & 16-1/32 SI-I RECCj 1/16x1/B BBS CAP FUSELAGE SHOWN V4TH 0431-ED / BN10P NQ 1I1Bd/B RIB CAP WITH 1/16 SD __1/B SO III1/SI SO LE~rliS SD SPAR 1/B SO lOP LONGERON\JliB TE /32 PLY RB 4 REDO 63 NSTAJI REDE AFTER WIG CENTERYRCAL STAB AND RN SECTER/16 B SECTOP S N PLACE1/B SI-IC/BSO/V4TH /1650 _______/lBx BB SD SPAN 1/32 PIN BER /iec ATE AB 1/8 50 LD1GEROIIS 118 S 1/16x1SI TYP I 1/8 50 VERT --V16SI-4 SECIlON CC 1Exl/4 SPRUCE r 1/B PLY GEAR MOIBIT 1/16 SH HALF-RIBS63 132 RN RIB\TBE BE0I-O j1/SI SH DOE/EL lie SO 1/B SO VENT TYP SD BALSA WRE 1/B SMh1I/AFTER CARViNG ~JJCUT 10 TTED LIES ________1/40A ALAN TL UM TUBE STRUT SOCPET1/8 SDIIIII HARD BALSA r ____________ TYP SHAPED NESMITH COUGAR RUBBER SCALE ay THDOE C EJSSL Niwd Blonchord Mordi 168 July1976 33 r1 SH R99323/BI-LViID BALSA SPAR DIIEIAL AND /1/16 SH RIBS1/B3I16 LE3/3250 SPARRN SEFBR6YION OP RIJELSTP CAP ROIED PAPER TLEE IIZ4JTZZ 1/B 50 OLAGONALS /rSTE SOOKET