QLXI SDCCIdL Frank Scott THE IDEAL control-line trainer has long elusive sort bird curiously enough successful trainer less often will flown reason ing really well-conceived trainer will quickly prepare fledgling exciting craft having thus mastered lowly seeming yet important trainer flier will abandon air planes better suited advanced flying PBA Special design tended grow fliers capabilities Starting sturdy steady Primary train er new wing becoming Basic stunt trainer addition wing flaps metamorphosis com pleted Advanced stunt trainer PBA Special thus much like Army Air Corps training program World War II Cadet started off Primary trainers learned get up back down breaking anything expensive gradu ated spritely Basic trainers really learned fly finally training completed Advanced train ers taught him use air plane So much philosophy lets get building unique ship will first notice PBA Special de signed 19-size engines Like aircraft compromise affair gen erally recognized little half-A mo& els cheaper dont crash hard larger class ships easier fly dont crash often larger 26 Model Aviation Plans instructions unique universal 1 9-powered CL trainer presented two installments primary trainer covered month will take interchangeable wings tail Basic Advanced configurationsto shown next issue size will also allow model fly grass longer flying lines will re duce possibility flier becoming bit dizzy Also modular design promotes growth also facilitates repairs may horrors become necessary keeping nature model project will presented magazine two installments first installment will complete Pri mary airplane can get started building right away flying fore next issue Well begin construction fuse lage since sooner later other components will attached thereto sheet-balsa fuselage sawn shape hardwood engine bearers plywood side doublers securely glued place recommend use Titebond glue throughout will require great clamp ing force prevent plywood nose doublers warping away balsa core water-based glue drying assembly has dried mounting holes should drilled such drilling much easier now later wing saddle next prepared thoroughly soaking plywood saddle very hot water has become somewhat pliable holding securely against suitable form used wing cut-out piece fuselage until quite dry formed saddle glued fuselage assembly reinforced triangular stock balsa fillets Note Fly-by shows clearly flat-bottomed wing Primary Trainer Both wing tail removable surfaces Basic Advanced ver sions can used same fuselage Left Daughter Jeanetteves flieswith Primary Trainer Half As cheaper bounce around bigger ships crack up less often Wing built-upbut quite strong simple will necessary cut way through fillets several places order conform saddles curva ture Balsa filler may used fill several slits flat plywood stabilizer mount secured similar manner Care should taken T-shaped bellcrank mount inserted its slot right side Its shape insures control system cannot pulled out course important safety consid eration Mount wire tail skid using cloth patch glue Also glue wing mounting dowels time fuselage can sanded smooth given several coats clear fuelproof dope sand ing note necessary model sort round edges Just make fuselage smooth wing may unusual trainer days built-up con struction brave heart weve designed easy strong construc tion First will need flat building surface cover plan sheet clear plastic such food wrap dry cleaners bag precaution taken prevent plan becoming part model Lay spruce lead ing trailing edge spars position over plan glue wing ribs place ribs followed two spruce upper spars balsa leading edge Allow dry overnight plane carve sand leading edge shape Sand entire structure smooth add line guide wing tip weight cover silk Coverite search recent model magazines should quickly disclose detailed articles regarding use covering materials Apply several coats clear fuelproof dope seal surface stabilizer elevator simply cut shape edges sanded round surfaces hinged together doping surfaces make sure dope does cause hinges bind free dom movement essential option al fin may omitted Primary trainer really doesnt need flight though fin does quite lot ships appearance Now get hardware stage construction Bend wire landing gear Left Wing mount made thin plywood soaked water shaped rubberbanding over block ribs resting against sturdy strip February 1977 27 Above Parts Primary Trainer advis able cut Out parts first construction goes quickly smoothly Below The plywood leadout guide attached inboard wing tip Right wing weight glued against tip block outboard wing against two top spars Below R Compare picture plans wing Above Plywood nose doublers after gluing fuselage necessary holes neatly drilled Large hole bellcrank mount PBA Special shape secure wheels place Various types wheel collars avail able hobby shop re tain wheels prefer solder washers wire task land ing gear slipped over top fuse lage secured metal- plastic landing gear clips bolts small stunt-type fuel tank held wire hooks passed through fuselage rubberbands passing hook hook around tank control system consists bellcrank flexible leadouts bolted T-shaped plywood mount control horn bolted elevator stiff wire pushrod connecting control horn bellcrank stabilizer secured its mounting plate small bolts nuts wing held rather like Cox PT19 several strong rubberbands run ning front dowel under wing aft dowel Make sure very securely done matter mounting engine have deliberately left last engine broken-in familiar engine would best mount engine wooden test stand never vise run least few tankfuls fuel through engine yourself thus prepared bolt securely place airplane sure place two flat washers between engine mounting lugs bearers two front bolts order slightly slant engine outwards will help hold model tight lines engine connected fuel tank length fuel line tubing new ship should just about ready flight first check airplanes bal ance carefully ship does balance point shown plan add weight nose tail until does Now aerodome model such will fly well either short grass paved areas As select flying site consider carefully safety aspects such no power phone lines nearby no traffic children might wander flight circle Con sider too noise aspect after some quite thrilled inspiring sound course town enlightened enough have municipal circles much better control lines recommend strand ed cable wire lines 015 diameter 52 ft long can purchased ready use form will care last long time Connect lines models leadouts using large size line connectors hobby shop Snap swivels fishing box definite no-no Roll wire out carefully connect line connectors control handle Now check lines straight untwisted taut Next pull back up line top control han dle elevator plane should move up doesnt dont get excited just switch lines handle Okay pull top handle back ele vator goes up vice versa Good Now adjust cable leadout device handle handle straight up down elevator will straight back time youll need have few words helper Since hell holding machine youre picking up handle make sure knows signal youll give him release ship Also should know model must take off straight ahead itw LzJ 0 0 Lii LU cn Lii -j -J z -j LU N -j -J Uself no push shove help along Also unlike full-size aircraft control-line models positioned take off downwind downwind take off builds speed help keep controling wires taut beginners usual difficulty over control notable very short porpoising sort flight prevent move wrist order di rect model instead lock wrist elbow too considering arm stiff rigid movable shoulder Got Okay want $1 E I/SX 3/4 SPRUCI II LEADING EDGE LINE GUIDEPRIMARY WING LINE GUIDE SUPPORT PERFECT No7 TANKI/16PLY WING PLATFORM LANDING GEAR ER BANDS / / / BELLCRANK MOUNT II I I I [ 032 045 WIRE FUEL TANK STRAP 2 SEND ENDS AFTER INSERTING THROUGH FUSE LAGE NOTE DRILL HOLES TO SUIT ENGINE TO BE USED AIRPLANE IS DESIGNED FOR 19 CU IN DISPLACEMENT ENGINES U1 / I\ IQlJA 3 CRANI TRIANGULAR BALSA\ REINFORCEMENT 2 2ZPVGIAIE1/4 BEAp~5 7 Th~:A0 o 7 10I 0o LANONG SWING WING 2WHEELS WING RI SOLDERED CI EVISPUS BRASS TUBE ADAPTORS FDA SPEC/AL MULTI-PURPOSE CL TRAINER THIS PAGE SHOWS ENTIRE PRIMARY AIRPLANE OPSIGNED BY FRANK SCOTT 28 Model Aviation plane rise raise whole arm way elevators will seem much less responsive resulting flight will much smoother safety thongs wrist now controls check out heart crowding Adams apple Theres nothing now give helper launch signal As ship starts roll hold arm straight out thus producing neutral elevator same time take easy step backwards help keep flying lines tight Remember control lines slack plane out control As plane speeds up gently give tiny bit up control plane should rise Neutral elevator will cause ship level off However cause lifting-type airfoil used surprised bit down eleva tor control needed fly level As plane flies around its circular flight path will probably find experience less dizzying instead turning place grinding heel ground walk plane small circle So out center flying circle now engine running helper holding ship fuselage outboard wing tip watching release signal Pick up control handle slip safety thong over wrist check youve got handle right side up giving up elevator seeing airplanes elevator does deed move up Check also neutral down No matter what sort com petitive sport CL events may choose fly later foregoing should always part routine before flight signal land loud silence engine runs out gas Landing l/4X 3/B BALSA FALSE LEADING EDGE jii 3/16SQ SPRUCE SPARS I/B RIBS ikI/2ROOT RIB I/B GUSSETSI/BX 3/4 SPRUCE TRAILING EDGE ' I /4 PLY BELLCRANI MT QKIIJ STAB REINFORCEMENT I/BX 1/4 SPRUCE UNDER SIDE ONLY I/B STABILIZER ELEVATOR STAB SUPPORT I/1B PLY 2 J I/2TIP RIBS Ut IDIA WING HOLDTRIANGULAR BALSAAPPROX 3/B RIGHT WN DOWELSREINFORCEMENT TOP ONLY __________________MAIN LANDING GEAR 9HORN 16 PLY FUSELAGEDOUBLER 2\t \ / I/B DIA I/IBDIA zi 1/4 DIAI I/B FIN B RUDDER IOPTIONAL NOTE PUSH ROD IS NOT SHOWN IN TOP OR SIDE VIEWS S USED TO CONNECT BELLCRANK TO ELEVATOR HORNFABRIC HINGES AGE /a 8Ls4ILI2 0FORM 32 MUSIC WIRE7GRASS TUBE TOR1~~JSTABLE CLEVIS I/IS WIRE TAILSKID February 1977 29 I/B PLY LINE GUIDE zIj NOTENO FIN OR RUDDER ARE REQUIRED BY THIS MODEL FOR SATISFACTORY FLIGHT 0 PRIMARY TRAINER CONTROL SENSITIVITY IS REDUCED THUS MAKING MODEL EASIER TO FLY BY CONNECTING THE PUSH ROD TO THE INNER MOST BELLCRANK HOLE AND OUTERMOST ELEVATOR HORN HOLE 0 ANGLING THE ENGINE TOWARDS THE OUTSIDE OF THE FLYING CIRCLE BY PLACING TWO WASHERS UNDER THE FRONT OF ENGINE LUGS WILL HELP KEEP CONTROL LINES TAUT NOTE THE FORWARD PLACEMENT OF THE LANDING GEAR HELPS TO STABILIZE THE MODEL IN FLIGHT BY BRINGING THE CENTER OF GRAVITY NCE POINT CLOSER TO THE NOSE OF THE AIRPLANE three drawings shown opposite page describe show features three air planes What makes 3-in-i design feasible employment wing saddle wings can strap BASIC TRAINER U ENLARGED ELEVATORS ARE FITTED TO IMPROVE CONTROL RESPONSIVENESS THE USE OF SYMETRICAL AIRFOIL SECTION ALLOWS THE WING TO FUNCTION EFFICIENTLY WHEN FLYING INVERTED r 0 NOTE MOVING THE LANDING GEAR BACK LESSENS BOUNCING AND BY SHIFTING THE MODELS BALANCE POINT REARWARD QUICKENS CONTROL RESPONSE THE OFFSETTING OF THE RUDDER TENDS TO TURN THE MODEL OUTWARDS tHUS HELPING KEEP CONTROL LINES TAUT II _____________ 30 Model Aviation D g 4 PBA Special easy no matter what model going come down trick bring down damage good procedure smooth landing sim ply maintain neutral elevator allowing model glide itself easily down ground practice youll get knack gradually feeding up elevator just ship skimming ground resulting applause getting three-point landing flight short because small fuel tank inasmuch taking off landing challenging parts learning fly level flights long du ration likely cause beginners dizziness believe number short flights will much productive few long flights fun too beginning try avoid model climbing high especially upwind side circle wind may cause plane drift toward causing slack lines loss control detect happening move back ward few steps necessaryquickly mustwhich will help maintain cru cial line tension practice wish model climb descend always perform climb downwind side circle no means should ever fly vicinity power lines current can jump lines actual contact being made Repeat fly anywhere near power lines So build Primary PBA Special practice flying round round next month well show convert Basic Mode fly upside down fl IT IS VERY IMPORTANT THAT FLAP EQUIPTED CL MODELS HAVE THEIR CONTROL SYSTEMS SET UP SO THAT THE MOTION OF THE FLAPS IS IN OPPOSITION TO THAT OF THE ELEVATORS li-n 3 NOTE THAT FLAPS ARE RIGGED TO MOVE APPROXIMATELY ONE-THIRD OF THE TRAVEL OF THE ELEVATORS airplane IS designed grow advancing flying skillsthe Primary Trainer fin appears photos because standard fuselage used same day make pictures three versions ship Article includes excellent flight instructions THE USE OF WING FLAPS INCREASE WING LIFT AS MODEL FLIES THROUGH MANEUVERS RESULTING IN SMOOTHER FLIGHT iT ADVANCED TRAINER
Edition: Model Aviation - 1977/02
Page Numbers: 26, 27, 28, 29, 30, 31
QLXI SDCCIdL Frank Scott THE IDEAL control-line trainer has long elusive sort bird curiously enough successful trainer less often will flown reason ing really well-conceived trainer will quickly prepare fledgling exciting craft having thus mastered lowly seeming yet important trainer flier will abandon air planes better suited advanced flying PBA Special design tended grow fliers capabilities Starting sturdy steady Primary train er new wing becoming Basic stunt trainer addition wing flaps metamorphosis com pleted Advanced stunt trainer PBA Special thus much like Army Air Corps training program World War II Cadet started off Primary trainers learned get up back down breaking anything expensive gradu ated spritely Basic trainers really learned fly finally training completed Advanced train ers taught him use air plane So much philosophy lets get building unique ship will first notice PBA Special de signed 19-size engines Like aircraft compromise affair gen erally recognized little half-A mo& els cheaper dont crash hard larger class ships easier fly dont crash often larger 26 Model Aviation Plans instructions unique universal 1 9-powered CL trainer presented two installments primary trainer covered month will take interchangeable wings tail Basic Advanced configurationsto shown next issue size will also allow model fly grass longer flying lines will re duce possibility flier becoming bit dizzy Also modular design promotes growth also facilitates repairs may horrors become necessary keeping nature model project will presented magazine two installments first installment will complete Pri mary airplane can get started building right away flying fore next issue Well begin construction fuse lage since sooner later other components will attached thereto sheet-balsa fuselage sawn shape hardwood engine bearers plywood side doublers securely glued place recommend use Titebond glue throughout will require great clamp ing force prevent plywood nose doublers warping away balsa core water-based glue drying assembly has dried mounting holes should drilled such drilling much easier now later wing saddle next prepared thoroughly soaking plywood saddle very hot water has become somewhat pliable holding securely against suitable form used wing cut-out piece fuselage until quite dry formed saddle glued fuselage assembly reinforced triangular stock balsa fillets Note Fly-by shows clearly flat-bottomed wing Primary Trainer Both wing tail removable surfaces Basic Advanced ver sions can used same fuselage Left Daughter Jeanetteves flieswith Primary Trainer Half As cheaper bounce around bigger ships crack up less often Wing built-upbut quite strong simple will necessary cut way through fillets several places order conform saddles curva ture Balsa filler may used fill several slits flat plywood stabilizer mount secured similar manner Care should taken T-shaped bellcrank mount inserted its slot right side Its shape insures control system cannot pulled out course important safety consid eration Mount wire tail skid using cloth patch glue Also glue wing mounting dowels time fuselage can sanded smooth given several coats clear fuelproof dope sand ing note necessary model sort round edges Just make fuselage smooth wing may unusual trainer days built-up con struction brave heart weve designed easy strong construc tion First will need flat building surface cover plan sheet clear plastic such food wrap dry cleaners bag precaution taken prevent plan becoming part model Lay spruce lead ing trailing edge spars position over plan glue wing ribs place ribs followed two spruce upper spars balsa leading edge Allow dry overnight plane carve sand leading edge shape Sand entire structure smooth add line guide wing tip weight cover silk Coverite search recent model magazines should quickly disclose detailed articles regarding use covering materials Apply several coats clear fuelproof dope seal surface stabilizer elevator simply cut shape edges sanded round surfaces hinged together doping surfaces make sure dope does cause hinges bind free dom movement essential option al fin may omitted Primary trainer really doesnt need flight though fin does quite lot ships appearance Now get hardware stage construction Bend wire landing gear Left Wing mount made thin plywood soaked water shaped rubberbanding over block ribs resting against sturdy strip February 1977 27 Above Parts Primary Trainer advis able cut Out parts first construction goes quickly smoothly Below The plywood leadout guide attached inboard wing tip Right wing weight glued against tip block outboard wing against two top spars Below R Compare picture plans wing Above Plywood nose doublers after gluing fuselage necessary holes neatly drilled Large hole bellcrank mount PBA Special shape secure wheels place Various types wheel collars avail able hobby shop re tain wheels prefer solder washers wire task land ing gear slipped over top fuse lage secured metal- plastic landing gear clips bolts small stunt-type fuel tank held wire hooks passed through fuselage rubberbands passing hook hook around tank control system consists bellcrank flexible leadouts bolted T-shaped plywood mount control horn bolted elevator stiff wire pushrod connecting control horn bellcrank stabilizer secured its mounting plate small bolts nuts wing held rather like Cox PT19 several strong rubberbands run ning front dowel under wing aft dowel Make sure very securely done matter mounting engine have deliberately left last engine broken-in familiar engine would best mount engine wooden test stand never vise run least few tankfuls fuel through engine yourself thus prepared bolt securely place airplane sure place two flat washers between engine mounting lugs bearers two front bolts order slightly slant engine outwards will help hold model tight lines engine connected fuel tank length fuel line tubing new ship should just about ready flight first check airplanes bal ance carefully ship does balance point shown plan add weight nose tail until does Now aerodome model such will fly well either short grass paved areas As select flying site consider carefully safety aspects such no power phone lines nearby no traffic children might wander flight circle Con sider too noise aspect after some quite thrilled inspiring sound course town enlightened enough have municipal circles much better control lines recommend strand ed cable wire lines 015 diameter 52 ft long can purchased ready use form will care last long time Connect lines models leadouts using large size line connectors hobby shop Snap swivels fishing box definite no-no Roll wire out carefully connect line connectors control handle Now check lines straight untwisted taut Next pull back up line top control han dle elevator plane should move up doesnt dont get excited just switch lines handle Okay pull top handle back ele vator goes up vice versa Good Now adjust cable leadout device handle handle straight up down elevator will straight back time youll need have few words helper Since hell holding machine youre picking up handle make sure knows signal youll give him release ship Also should know model must take off straight ahead itw LzJ 0 0 Lii LU cn Lii -j -J z -j LU N -j -J Uself no push shove help along Also unlike full-size aircraft control-line models positioned take off downwind downwind take off builds speed help keep controling wires taut beginners usual difficulty over control notable very short porpoising sort flight prevent move wrist order di rect model instead lock wrist elbow too considering arm stiff rigid movable shoulder Got Okay want $1 E I/SX 3/4 SPRUCI II LEADING EDGE LINE GUIDEPRIMARY WING LINE GUIDE SUPPORT PERFECT No7 TANKI/16PLY WING PLATFORM LANDING GEAR ER BANDS / / / BELLCRANK MOUNT II I I I [ 032 045 WIRE FUEL TANK STRAP 2 SEND ENDS AFTER INSERTING THROUGH FUSE LAGE NOTE DRILL HOLES TO SUIT ENGINE TO BE USED AIRPLANE IS DESIGNED FOR 19 CU IN DISPLACEMENT ENGINES U1 / I\ IQlJA 3 CRANI TRIANGULAR BALSA\ REINFORCEMENT 2 2ZPVGIAIE1/4 BEAp~5 7 Th~:A0 o 7 10I 0o LANONG SWING WING 2WHEELS WING RI SOLDERED CI EVISPUS BRASS TUBE ADAPTORS FDA SPEC/AL MULTI-PURPOSE CL TRAINER THIS PAGE SHOWS ENTIRE PRIMARY AIRPLANE OPSIGNED BY FRANK SCOTT 28 Model Aviation plane rise raise whole arm way elevators will seem much less responsive resulting flight will much smoother safety thongs wrist now controls check out heart crowding Adams apple Theres nothing now give helper launch signal As ship starts roll hold arm straight out thus producing neutral elevator same time take easy step backwards help keep flying lines tight Remember control lines slack plane out control As plane speeds up gently give tiny bit up control plane should rise Neutral elevator will cause ship level off However cause lifting-type airfoil used surprised bit down eleva tor control needed fly level As plane flies around its circular flight path will probably find experience less dizzying instead turning place grinding heel ground walk plane small circle So out center flying circle now engine running helper holding ship fuselage outboard wing tip watching release signal Pick up control handle slip safety thong over wrist check youve got handle right side up giving up elevator seeing airplanes elevator does deed move up Check also neutral down No matter what sort com petitive sport CL events may choose fly later foregoing should always part routine before flight signal land loud silence engine runs out gas Landing l/4X 3/B BALSA FALSE LEADING EDGE jii 3/16SQ SPRUCE SPARS I/B RIBS ikI/2ROOT RIB I/B GUSSETSI/BX 3/4 SPRUCE TRAILING EDGE ' I /4 PLY BELLCRANI MT QKIIJ STAB REINFORCEMENT I/BX 1/4 SPRUCE UNDER SIDE ONLY I/B STABILIZER ELEVATOR STAB SUPPORT I/1B PLY 2 J I/2TIP RIBS Ut IDIA WING HOLDTRIANGULAR BALSAAPPROX 3/B RIGHT WN DOWELSREINFORCEMENT TOP ONLY __________________MAIN LANDING GEAR 9HORN 16 PLY FUSELAGEDOUBLER 2\t \ / I/B DIA I/IBDIA zi 1/4 DIAI I/B FIN B RUDDER IOPTIONAL NOTE PUSH ROD IS NOT SHOWN IN TOP OR SIDE VIEWS S USED TO CONNECT BELLCRANK TO ELEVATOR HORNFABRIC HINGES AGE /a 8Ls4ILI2 0FORM 32 MUSIC WIRE7GRASS TUBE TOR1~~JSTABLE CLEVIS I/IS WIRE TAILSKID February 1977 29 I/B PLY LINE GUIDE zIj NOTENO FIN OR RUDDER ARE REQUIRED BY THIS MODEL FOR SATISFACTORY FLIGHT 0 PRIMARY TRAINER CONTROL SENSITIVITY IS REDUCED THUS MAKING MODEL EASIER TO FLY BY CONNECTING THE PUSH ROD TO THE INNER MOST BELLCRANK HOLE AND OUTERMOST ELEVATOR HORN HOLE 0 ANGLING THE ENGINE TOWARDS THE OUTSIDE OF THE FLYING CIRCLE BY PLACING TWO WASHERS UNDER THE FRONT OF ENGINE LUGS WILL HELP KEEP CONTROL LINES TAUT NOTE THE FORWARD PLACEMENT OF THE LANDING GEAR HELPS TO STABILIZE THE MODEL IN FLIGHT BY BRINGING THE CENTER OF GRAVITY NCE POINT CLOSER TO THE NOSE OF THE AIRPLANE three drawings shown opposite page describe show features three air planes What makes 3-in-i design feasible employment wing saddle wings can strap BASIC TRAINER U ENLARGED ELEVATORS ARE FITTED TO IMPROVE CONTROL RESPONSIVENESS THE USE OF SYMETRICAL AIRFOIL SECTION ALLOWS THE WING TO FUNCTION EFFICIENTLY WHEN FLYING INVERTED r 0 NOTE MOVING THE LANDING GEAR BACK LESSENS BOUNCING AND BY SHIFTING THE MODELS BALANCE POINT REARWARD QUICKENS CONTROL RESPONSE THE OFFSETTING OF THE RUDDER TENDS TO TURN THE MODEL OUTWARDS tHUS HELPING KEEP CONTROL LINES TAUT II _____________ 30 Model Aviation D g 4 PBA Special easy no matter what model going come down trick bring down damage good procedure smooth landing sim ply maintain neutral elevator allowing model glide itself easily down ground practice youll get knack gradually feeding up elevator just ship skimming ground resulting applause getting three-point landing flight short because small fuel tank inasmuch taking off landing challenging parts learning fly level flights long du ration likely cause beginners dizziness believe number short flights will much productive few long flights fun too beginning try avoid model climbing high especially upwind side circle wind may cause plane drift toward causing slack lines loss control detect happening move back ward few steps necessaryquickly mustwhich will help maintain cru cial line tension practice wish model climb descend always perform climb downwind side circle no means should ever fly vicinity power lines current can jump lines actual contact being made Repeat fly anywhere near power lines So build Primary PBA Special practice flying round round next month well show convert Basic Mode fly upside down fl IT IS VERY IMPORTANT THAT FLAP EQUIPTED CL MODELS HAVE THEIR CONTROL SYSTEMS SET UP SO THAT THE MOTION OF THE FLAPS IS IN OPPOSITION TO THAT OF THE ELEVATORS li-n 3 NOTE THAT FLAPS ARE RIGGED TO MOVE APPROXIMATELY ONE-THIRD OF THE TRAVEL OF THE ELEVATORS airplane IS designed grow advancing flying skillsthe Primary Trainer fin appears photos because standard fuselage used same day make pictures three versions ship Article includes excellent flight instructions THE USE OF WING FLAPS INCREASE WING LIFT AS MODEL FLIES THROUGH MANEUVERS RESULTING IN SMOOTHER FLIGHT iT ADVANCED TRAINER
Edition: Model Aviation - 1977/02
Page Numbers: 26, 27, 28, 29, 30, 31
QLXI SDCCIdL Frank Scott THE IDEAL control-line trainer has long elusive sort bird curiously enough successful trainer less often will flown reason ing really well-conceived trainer will quickly prepare fledgling exciting craft having thus mastered lowly seeming yet important trainer flier will abandon air planes better suited advanced flying PBA Special design tended grow fliers capabilities Starting sturdy steady Primary train er new wing becoming Basic stunt trainer addition wing flaps metamorphosis com pleted Advanced stunt trainer PBA Special thus much like Army Air Corps training program World War II Cadet started off Primary trainers learned get up back down breaking anything expensive gradu ated spritely Basic trainers really learned fly finally training completed Advanced train ers taught him use air plane So much philosophy lets get building unique ship will first notice PBA Special de signed 19-size engines Like aircraft compromise affair gen erally recognized little half-A mo& els cheaper dont crash hard larger class ships easier fly dont crash often larger 26 Model Aviation Plans instructions unique universal 1 9-powered CL trainer presented two installments primary trainer covered month will take interchangeable wings tail Basic Advanced configurationsto shown next issue size will also allow model fly grass longer flying lines will re duce possibility flier becoming bit dizzy Also modular design promotes growth also facilitates repairs may horrors become necessary keeping nature model project will presented magazine two installments first installment will complete Pri mary airplane can get started building right away flying fore next issue Well begin construction fuse lage since sooner later other components will attached thereto sheet-balsa fuselage sawn shape hardwood engine bearers plywood side doublers securely glued place recommend use Titebond glue throughout will require great clamp ing force prevent plywood nose doublers warping away balsa core water-based glue drying assembly has dried mounting holes should drilled such drilling much easier now later wing saddle next prepared thoroughly soaking plywood saddle very hot water has become somewhat pliable holding securely against suitable form used wing cut-out piece fuselage until quite dry formed saddle glued fuselage assembly reinforced triangular stock balsa fillets Note Fly-by shows clearly flat-bottomed wing Primary Trainer Both wing tail removable surfaces Basic Advanced ver sions can used same fuselage Left Daughter Jeanetteves flieswith Primary Trainer Half As cheaper bounce around bigger ships crack up less often Wing built-upbut quite strong simple will necessary cut way through fillets several places order conform saddles curva ture Balsa filler may used fill several slits flat plywood stabilizer mount secured similar manner Care should taken T-shaped bellcrank mount inserted its slot right side Its shape insures control system cannot pulled out course important safety consid eration Mount wire tail skid using cloth patch glue Also glue wing mounting dowels time fuselage can sanded smooth given several coats clear fuelproof dope sand ing note necessary model sort round edges Just make fuselage smooth wing may unusual trainer days built-up con struction brave heart weve designed easy strong construc tion First will need flat building surface cover plan sheet clear plastic such food wrap dry cleaners bag precaution taken prevent plan becoming part model Lay spruce lead ing trailing edge spars position over plan glue wing ribs place ribs followed two spruce upper spars balsa leading edge Allow dry overnight plane carve sand leading edge shape Sand entire structure smooth add line guide wing tip weight cover silk Coverite search recent model magazines should quickly disclose detailed articles regarding use covering materials Apply several coats clear fuelproof dope seal surface stabilizer elevator simply cut shape edges sanded round surfaces hinged together doping surfaces make sure dope does cause hinges bind free dom movement essential option al fin may omitted Primary trainer really doesnt need flight though fin does quite lot ships appearance Now get hardware stage construction Bend wire landing gear Left Wing mount made thin plywood soaked water shaped rubberbanding over block ribs resting against sturdy strip February 1977 27 Above Parts Primary Trainer advis able cut Out parts first construction goes quickly smoothly Below The plywood leadout guide attached inboard wing tip Right wing weight glued against tip block outboard wing against two top spars Below R Compare picture plans wing Above Plywood nose doublers after gluing fuselage necessary holes neatly drilled Large hole bellcrank mount PBA Special shape secure wheels place Various types wheel collars avail able hobby shop re tain wheels prefer solder washers wire task land ing gear slipped over top fuse lage secured metal- plastic landing gear clips bolts small stunt-type fuel tank held wire hooks passed through fuselage rubberbands passing hook hook around tank control system consists bellcrank flexible leadouts bolted T-shaped plywood mount control horn bolted elevator stiff wire pushrod connecting control horn bellcrank stabilizer secured its mounting plate small bolts nuts wing held rather like Cox PT19 several strong rubberbands run ning front dowel under wing aft dowel Make sure very securely done matter mounting engine have deliberately left last engine broken-in familiar engine would best mount engine wooden test stand never vise run least few tankfuls fuel through engine yourself thus prepared bolt securely place airplane sure place two flat washers between engine mounting lugs bearers two front bolts order slightly slant engine outwards will help hold model tight lines engine connected fuel tank length fuel line tubing new ship should just about ready flight first check airplanes bal ance carefully ship does balance point shown plan add weight nose tail until does Now aerodome model such will fly well either short grass paved areas As select flying site consider carefully safety aspects such no power phone lines nearby no traffic children might wander flight circle Con sider too noise aspect after some quite thrilled inspiring sound course town enlightened enough have municipal circles much better control lines recommend strand ed cable wire lines 015 diameter 52 ft long can purchased ready use form will care last long time Connect lines models leadouts using large size line connectors hobby shop Snap swivels fishing box definite no-no Roll wire out carefully connect line connectors control handle Now check lines straight untwisted taut Next pull back up line top control han dle elevator plane should move up doesnt dont get excited just switch lines handle Okay pull top handle back ele vator goes up vice versa Good Now adjust cable leadout device handle handle straight up down elevator will straight back time youll need have few words helper Since hell holding machine youre picking up handle make sure knows signal youll give him release ship Also should know model must take off straight ahead itw LzJ 0 0 Lii LU cn Lii -j -J z -j LU N -j -J Uself no push shove help along Also unlike full-size aircraft control-line models positioned take off downwind downwind take off builds speed help keep controling wires taut beginners usual difficulty over control notable very short porpoising sort flight prevent move wrist order di rect model instead lock wrist elbow too considering arm stiff rigid movable shoulder Got Okay want $1 E I/SX 3/4 SPRUCI II LEADING EDGE LINE GUIDEPRIMARY WING LINE GUIDE SUPPORT PERFECT No7 TANKI/16PLY WING PLATFORM LANDING GEAR ER BANDS / / / BELLCRANK MOUNT II I I I [ 032 045 WIRE FUEL TANK STRAP 2 SEND ENDS AFTER INSERTING THROUGH FUSE LAGE NOTE DRILL HOLES TO SUIT ENGINE TO BE USED AIRPLANE IS DESIGNED FOR 19 CU IN DISPLACEMENT ENGINES U1 / I\ IQlJA 3 CRANI TRIANGULAR BALSA\ REINFORCEMENT 2 2ZPVGIAIE1/4 BEAp~5 7 Th~:A0 o 7 10I 0o LANONG SWING WING 2WHEELS WING RI SOLDERED CI EVISPUS BRASS TUBE ADAPTORS FDA SPEC/AL MULTI-PURPOSE CL TRAINER THIS PAGE SHOWS ENTIRE PRIMARY AIRPLANE OPSIGNED BY FRANK SCOTT 28 Model Aviation plane rise raise whole arm way elevators will seem much less responsive resulting flight will much smoother safety thongs wrist now controls check out heart crowding Adams apple Theres nothing now give helper launch signal As ship starts roll hold arm straight out thus producing neutral elevator same time take easy step backwards help keep flying lines tight Remember control lines slack plane out control As plane speeds up gently give tiny bit up control plane should rise Neutral elevator will cause ship level off However cause lifting-type airfoil used surprised bit down eleva tor control needed fly level As plane flies around its circular flight path will probably find experience less dizzying instead turning place grinding heel ground walk plane small circle So out center flying circle now engine running helper holding ship fuselage outboard wing tip watching release signal Pick up control handle slip safety thong over wrist check youve got handle right side up giving up elevator seeing airplanes elevator does deed move up Check also neutral down No matter what sort com petitive sport CL events may choose fly later foregoing should always part routine before flight signal land loud silence engine runs out gas Landing l/4X 3/B BALSA FALSE LEADING EDGE jii 3/16SQ SPRUCE SPARS I/B RIBS ikI/2ROOT RIB I/B GUSSETSI/BX 3/4 SPRUCE TRAILING EDGE ' I /4 PLY BELLCRANI MT QKIIJ STAB REINFORCEMENT I/BX 1/4 SPRUCE UNDER SIDE ONLY I/B STABILIZER ELEVATOR STAB SUPPORT I/1B PLY 2 J I/2TIP RIBS Ut IDIA WING HOLDTRIANGULAR BALSAAPPROX 3/B RIGHT WN DOWELSREINFORCEMENT TOP ONLY __________________MAIN LANDING GEAR 9HORN 16 PLY FUSELAGEDOUBLER 2\t \ / I/B DIA I/IBDIA zi 1/4 DIAI I/B FIN B RUDDER IOPTIONAL NOTE PUSH ROD IS NOT SHOWN IN TOP OR SIDE VIEWS S USED TO CONNECT BELLCRANK TO ELEVATOR HORNFABRIC HINGES AGE /a 8Ls4ILI2 0FORM 32 MUSIC WIRE7GRASS TUBE TOR1~~JSTABLE CLEVIS I/IS WIRE TAILSKID February 1977 29 I/B PLY LINE GUIDE zIj NOTENO FIN OR RUDDER ARE REQUIRED BY THIS MODEL FOR SATISFACTORY FLIGHT 0 PRIMARY TRAINER CONTROL SENSITIVITY IS REDUCED THUS MAKING MODEL EASIER TO FLY BY CONNECTING THE PUSH ROD TO THE INNER MOST BELLCRANK HOLE AND OUTERMOST ELEVATOR HORN HOLE 0 ANGLING THE ENGINE TOWARDS THE OUTSIDE OF THE FLYING CIRCLE BY PLACING TWO WASHERS UNDER THE FRONT OF ENGINE LUGS WILL HELP KEEP CONTROL LINES TAUT NOTE THE FORWARD PLACEMENT OF THE LANDING GEAR HELPS TO STABILIZE THE MODEL IN FLIGHT BY BRINGING THE CENTER OF GRAVITY NCE POINT CLOSER TO THE NOSE OF THE AIRPLANE three drawings shown opposite page describe show features three air planes What makes 3-in-i design feasible employment wing saddle wings can strap BASIC TRAINER U ENLARGED ELEVATORS ARE FITTED TO IMPROVE CONTROL RESPONSIVENESS THE USE OF SYMETRICAL AIRFOIL SECTION ALLOWS THE WING TO FUNCTION EFFICIENTLY WHEN FLYING INVERTED r 0 NOTE MOVING THE LANDING GEAR BACK LESSENS BOUNCING AND BY SHIFTING THE MODELS BALANCE POINT REARWARD QUICKENS CONTROL RESPONSE THE OFFSETTING OF THE RUDDER TENDS TO TURN THE MODEL OUTWARDS tHUS HELPING KEEP CONTROL LINES TAUT II _____________ 30 Model Aviation D g 4 PBA Special easy no matter what model going come down trick bring down damage good procedure smooth landing sim ply maintain neutral elevator allowing model glide itself easily down ground practice youll get knack gradually feeding up elevator just ship skimming ground resulting applause getting three-point landing flight short because small fuel tank inasmuch taking off landing challenging parts learning fly level flights long du ration likely cause beginners dizziness believe number short flights will much productive few long flights fun too beginning try avoid model climbing high especially upwind side circle wind may cause plane drift toward causing slack lines loss control detect happening move back ward few steps necessaryquickly mustwhich will help maintain cru cial line tension practice wish model climb descend always perform climb downwind side circle no means should ever fly vicinity power lines current can jump lines actual contact being made Repeat fly anywhere near power lines So build Primary PBA Special practice flying round round next month well show convert Basic Mode fly upside down fl IT IS VERY IMPORTANT THAT FLAP EQUIPTED CL MODELS HAVE THEIR CONTROL SYSTEMS SET UP SO THAT THE MOTION OF THE FLAPS IS IN OPPOSITION TO THAT OF THE ELEVATORS li-n 3 NOTE THAT FLAPS ARE RIGGED TO MOVE APPROXIMATELY ONE-THIRD OF THE TRAVEL OF THE ELEVATORS airplane IS designed grow advancing flying skillsthe Primary Trainer fin appears photos because standard fuselage used same day make pictures three versions ship Article includes excellent flight instructions THE USE OF WING FLAPS INCREASE WING LIFT AS MODEL FLIES THROUGH MANEUVERS RESULTING IN SMOOTHER FLIGHT iT ADVANCED TRAINER
Edition: Model Aviation - 1977/02
Page Numbers: 26, 27, 28, 29, 30, 31
QLXI SDCCIdL Frank Scott THE IDEAL control-line trainer has long elusive sort bird curiously enough successful trainer less often will flown reason ing really well-conceived trainer will quickly prepare fledgling exciting craft having thus mastered lowly seeming yet important trainer flier will abandon air planes better suited advanced flying PBA Special design tended grow fliers capabilities Starting sturdy steady Primary train er new wing becoming Basic stunt trainer addition wing flaps metamorphosis com pleted Advanced stunt trainer PBA Special thus much like Army Air Corps training program World War II Cadet started off Primary trainers learned get up back down breaking anything expensive gradu ated spritely Basic trainers really learned fly finally training completed Advanced train ers taught him use air plane So much philosophy lets get building unique ship will first notice PBA Special de signed 19-size engines Like aircraft compromise affair gen erally recognized little half-A mo& els cheaper dont crash hard larger class ships easier fly dont crash often larger 26 Model Aviation Plans instructions unique universal 1 9-powered CL trainer presented two installments primary trainer covered month will take interchangeable wings tail Basic Advanced configurationsto shown next issue size will also allow model fly grass longer flying lines will re duce possibility flier becoming bit dizzy Also modular design promotes growth also facilitates repairs may horrors become necessary keeping nature model project will presented magazine two installments first installment will complete Pri mary airplane can get started building right away flying fore next issue Well begin construction fuse lage since sooner later other components will attached thereto sheet-balsa fuselage sawn shape hardwood engine bearers plywood side doublers securely glued place recommend use Titebond glue throughout will require great clamp ing force prevent plywood nose doublers warping away balsa core water-based glue drying assembly has dried mounting holes should drilled such drilling much easier now later wing saddle next prepared thoroughly soaking plywood saddle very hot water has become somewhat pliable holding securely against suitable form used wing cut-out piece fuselage until quite dry formed saddle glued fuselage assembly reinforced triangular stock balsa fillets Note Fly-by shows clearly flat-bottomed wing Primary Trainer Both wing tail removable surfaces Basic Advanced ver sions can used same fuselage Left Daughter Jeanetteves flieswith Primary Trainer Half As cheaper bounce around bigger ships crack up less often Wing built-upbut quite strong simple will necessary cut way through fillets several places order conform saddles curva ture Balsa filler may used fill several slits flat plywood stabilizer mount secured similar manner Care should taken T-shaped bellcrank mount inserted its slot right side Its shape insures control system cannot pulled out course important safety consid eration Mount wire tail skid using cloth patch glue Also glue wing mounting dowels time fuselage can sanded smooth given several coats clear fuelproof dope sand ing note necessary model sort round edges Just make fuselage smooth wing may unusual trainer days built-up con struction brave heart weve designed easy strong construc tion First will need flat building surface cover plan sheet clear plastic such food wrap dry cleaners bag precaution taken prevent plan becoming part model Lay spruce lead ing trailing edge spars position over plan glue wing ribs place ribs followed two spruce upper spars balsa leading edge Allow dry overnight plane carve sand leading edge shape Sand entire structure smooth add line guide wing tip weight cover silk Coverite search recent model magazines should quickly disclose detailed articles regarding use covering materials Apply several coats clear fuelproof dope seal surface stabilizer elevator simply cut shape edges sanded round surfaces hinged together doping surfaces make sure dope does cause hinges bind free dom movement essential option al fin may omitted Primary trainer really doesnt need flight though fin does quite lot ships appearance Now get hardware stage construction Bend wire landing gear Left Wing mount made thin plywood soaked water shaped rubberbanding over block ribs resting against sturdy strip February 1977 27 Above Parts Primary Trainer advis able cut Out parts first construction goes quickly smoothly Below The plywood leadout guide attached inboard wing tip Right wing weight glued against tip block outboard wing against two top spars Below R Compare picture plans wing Above Plywood nose doublers after gluing fuselage necessary holes neatly drilled Large hole bellcrank mount PBA Special shape secure wheels place Various types wheel collars avail able hobby shop re tain wheels prefer solder washers wire task land ing gear slipped over top fuse lage secured metal- plastic landing gear clips bolts small stunt-type fuel tank held wire hooks passed through fuselage rubberbands passing hook hook around tank control system consists bellcrank flexible leadouts bolted T-shaped plywood mount control horn bolted elevator stiff wire pushrod connecting control horn bellcrank stabilizer secured its mounting plate small bolts nuts wing held rather like Cox PT19 several strong rubberbands run ning front dowel under wing aft dowel Make sure very securely done matter mounting engine have deliberately left last engine broken-in familiar engine would best mount engine wooden test stand never vise run least few tankfuls fuel through engine yourself thus prepared bolt securely place airplane sure place two flat washers between engine mounting lugs bearers two front bolts order slightly slant engine outwards will help hold model tight lines engine connected fuel tank length fuel line tubing new ship should just about ready flight first check airplanes bal ance carefully ship does balance point shown plan add weight nose tail until does Now aerodome model such will fly well either short grass paved areas As select flying site consider carefully safety aspects such no power phone lines nearby no traffic children might wander flight circle Con sider too noise aspect after some quite thrilled inspiring sound course town enlightened enough have municipal circles much better control lines recommend strand ed cable wire lines 015 diameter 52 ft long can purchased ready use form will care last long time Connect lines models leadouts using large size line connectors hobby shop Snap swivels fishing box definite no-no Roll wire out carefully connect line connectors control handle Now check lines straight untwisted taut Next pull back up line top control han dle elevator plane should move up doesnt dont get excited just switch lines handle Okay pull top handle back ele vator goes up vice versa Good Now adjust cable leadout device handle handle straight up down elevator will straight back time youll need have few words helper Since hell holding machine youre picking up handle make sure knows signal youll give him release ship Also should know model must take off straight ahead itw LzJ 0 0 Lii LU cn Lii -j -J z -j LU N -j -J Uself no push shove help along Also unlike full-size aircraft control-line models positioned take off downwind downwind take off builds speed help keep controling wires taut beginners usual difficulty over control notable very short porpoising sort flight prevent move wrist order di rect model instead lock wrist elbow too considering arm stiff rigid movable shoulder Got Okay want $1 E I/SX 3/4 SPRUCI II LEADING EDGE LINE GUIDEPRIMARY WING LINE GUIDE SUPPORT PERFECT No7 TANKI/16PLY WING PLATFORM LANDING GEAR ER BANDS / / / BELLCRANK MOUNT II I I I [ 032 045 WIRE FUEL TANK STRAP 2 SEND ENDS AFTER INSERTING THROUGH FUSE LAGE NOTE DRILL HOLES TO SUIT ENGINE TO BE USED AIRPLANE IS DESIGNED FOR 19 CU IN DISPLACEMENT ENGINES U1 / I\ IQlJA 3 CRANI TRIANGULAR BALSA\ REINFORCEMENT 2 2ZPVGIAIE1/4 BEAp~5 7 Th~:A0 o 7 10I 0o LANONG SWING WING 2WHEELS WING RI SOLDERED CI EVISPUS BRASS TUBE ADAPTORS FDA SPEC/AL MULTI-PURPOSE CL TRAINER THIS PAGE SHOWS ENTIRE PRIMARY AIRPLANE OPSIGNED BY FRANK SCOTT 28 Model Aviation plane rise raise whole arm way elevators will seem much less responsive resulting flight will much smoother safety thongs wrist now controls check out heart crowding Adams apple Theres nothing now give helper launch signal As ship starts roll hold arm straight out thus producing neutral elevator same time take easy step backwards help keep flying lines tight Remember control lines slack plane out control As plane speeds up gently give tiny bit up control plane should rise Neutral elevator will cause ship level off However cause lifting-type airfoil used surprised bit down eleva tor control needed fly level As plane flies around its circular flight path will probably find experience less dizzying instead turning place grinding heel ground walk plane small circle So out center flying circle now engine running helper holding ship fuselage outboard wing tip watching release signal Pick up control handle slip safety thong over wrist check youve got handle right side up giving up elevator seeing airplanes elevator does deed move up Check also neutral down No matter what sort com petitive sport CL events may choose fly later foregoing should always part routine before flight signal land loud silence engine runs out gas Landing l/4X 3/B BALSA FALSE LEADING EDGE jii 3/16SQ SPRUCE SPARS I/B RIBS ikI/2ROOT RIB I/B GUSSETSI/BX 3/4 SPRUCE TRAILING EDGE ' I /4 PLY BELLCRANI MT QKIIJ STAB REINFORCEMENT I/BX 1/4 SPRUCE UNDER SIDE ONLY I/B STABILIZER ELEVATOR STAB SUPPORT I/1B PLY 2 J I/2TIP RIBS Ut IDIA WING HOLDTRIANGULAR BALSAAPPROX 3/B RIGHT WN DOWELSREINFORCEMENT TOP ONLY __________________MAIN LANDING GEAR 9HORN 16 PLY FUSELAGEDOUBLER 2\t \ / I/B DIA I/IBDIA zi 1/4 DIAI I/B FIN B RUDDER IOPTIONAL NOTE PUSH ROD IS NOT SHOWN IN TOP OR SIDE VIEWS S USED TO CONNECT BELLCRANK TO ELEVATOR HORNFABRIC HINGES AGE /a 8Ls4ILI2 0FORM 32 MUSIC WIRE7GRASS TUBE TOR1~~JSTABLE CLEVIS I/IS WIRE TAILSKID February 1977 29 I/B PLY LINE GUIDE zIj NOTENO FIN OR RUDDER ARE REQUIRED BY THIS MODEL FOR SATISFACTORY FLIGHT 0 PRIMARY TRAINER CONTROL SENSITIVITY IS REDUCED THUS MAKING MODEL EASIER TO FLY BY CONNECTING THE PUSH ROD TO THE INNER MOST BELLCRANK HOLE AND OUTERMOST ELEVATOR HORN HOLE 0 ANGLING THE ENGINE TOWARDS THE OUTSIDE OF THE FLYING CIRCLE BY PLACING TWO WASHERS UNDER THE FRONT OF ENGINE LUGS WILL HELP KEEP CONTROL LINES TAUT NOTE THE FORWARD PLACEMENT OF THE LANDING GEAR HELPS TO STABILIZE THE MODEL IN FLIGHT BY BRINGING THE CENTER OF GRAVITY NCE POINT CLOSER TO THE NOSE OF THE AIRPLANE three drawings shown opposite page describe show features three air planes What makes 3-in-i design feasible employment wing saddle wings can strap BASIC TRAINER U ENLARGED ELEVATORS ARE FITTED TO IMPROVE CONTROL RESPONSIVENESS THE USE OF SYMETRICAL AIRFOIL SECTION ALLOWS THE WING TO FUNCTION EFFICIENTLY WHEN FLYING INVERTED r 0 NOTE MOVING THE LANDING GEAR BACK LESSENS BOUNCING AND BY SHIFTING THE MODELS BALANCE POINT REARWARD QUICKENS CONTROL RESPONSE THE OFFSETTING OF THE RUDDER TENDS TO TURN THE MODEL OUTWARDS tHUS HELPING KEEP CONTROL LINES TAUT II _____________ 30 Model Aviation D g 4 PBA Special easy no matter what model going come down trick bring down damage good procedure smooth landing sim ply maintain neutral elevator allowing model glide itself easily down ground practice youll get knack gradually feeding up elevator just ship skimming ground resulting applause getting three-point landing flight short because small fuel tank inasmuch taking off landing challenging parts learning fly level flights long du ration likely cause beginners dizziness believe number short flights will much productive few long flights fun too beginning try avoid model climbing high especially upwind side circle wind may cause plane drift toward causing slack lines loss control detect happening move back ward few steps necessaryquickly mustwhich will help maintain cru cial line tension practice wish model climb descend always perform climb downwind side circle no means should ever fly vicinity power lines current can jump lines actual contact being made Repeat fly anywhere near power lines So build Primary PBA Special practice flying round round next month well show convert Basic Mode fly upside down fl IT IS VERY IMPORTANT THAT FLAP EQUIPTED CL MODELS HAVE THEIR CONTROL SYSTEMS SET UP SO THAT THE MOTION OF THE FLAPS IS IN OPPOSITION TO THAT OF THE ELEVATORS li-n 3 NOTE THAT FLAPS ARE RIGGED TO MOVE APPROXIMATELY ONE-THIRD OF THE TRAVEL OF THE ELEVATORS airplane IS designed grow advancing flying skillsthe Primary Trainer fin appears photos because standard fuselage used same day make pictures three versions ship Article includes excellent flight instructions THE USE OF WING FLAPS INCREASE WING LIFT AS MODEL FLIES THROUGH MANEUVERS RESULTING IN SMOOTHER FLIGHT iT ADVANCED TRAINER
Edition: Model Aviation - 1977/02
Page Numbers: 26, 27, 28, 29, 30, 31
QLXI SDCCIdL Frank Scott THE IDEAL control-line trainer has long elusive sort bird curiously enough successful trainer less often will flown reason ing really well-conceived trainer will quickly prepare fledgling exciting craft having thus mastered lowly seeming yet important trainer flier will abandon air planes better suited advanced flying PBA Special design tended grow fliers capabilities Starting sturdy steady Primary train er new wing becoming Basic stunt trainer addition wing flaps metamorphosis com pleted Advanced stunt trainer PBA Special thus much like Army Air Corps training program World War II Cadet started off Primary trainers learned get up back down breaking anything expensive gradu ated spritely Basic trainers really learned fly finally training completed Advanced train ers taught him use air plane So much philosophy lets get building unique ship will first notice PBA Special de signed 19-size engines Like aircraft compromise affair gen erally recognized little half-A mo& els cheaper dont crash hard larger class ships easier fly dont crash often larger 26 Model Aviation Plans instructions unique universal 1 9-powered CL trainer presented two installments primary trainer covered month will take interchangeable wings tail Basic Advanced configurationsto shown next issue size will also allow model fly grass longer flying lines will re duce possibility flier becoming bit dizzy Also modular design promotes growth also facilitates repairs may horrors become necessary keeping nature model project will presented magazine two installments first installment will complete Pri mary airplane can get started building right away flying fore next issue Well begin construction fuse lage since sooner later other components will attached thereto sheet-balsa fuselage sawn shape hardwood engine bearers plywood side doublers securely glued place recommend use Titebond glue throughout will require great clamp ing force prevent plywood nose doublers warping away balsa core water-based glue drying assembly has dried mounting holes should drilled such drilling much easier now later wing saddle next prepared thoroughly soaking plywood saddle very hot water has become somewhat pliable holding securely against suitable form used wing cut-out piece fuselage until quite dry formed saddle glued fuselage assembly reinforced triangular stock balsa fillets Note Fly-by shows clearly flat-bottomed wing Primary Trainer Both wing tail removable surfaces Basic Advanced ver sions can used same fuselage Left Daughter Jeanetteves flieswith Primary Trainer Half As cheaper bounce around bigger ships crack up less often Wing built-upbut quite strong simple will necessary cut way through fillets several places order conform saddles curva ture Balsa filler may used fill several slits flat plywood stabilizer mount secured similar manner Care should taken T-shaped bellcrank mount inserted its slot right side Its shape insures control system cannot pulled out course important safety consid eration Mount wire tail skid using cloth patch glue Also glue wing mounting dowels time fuselage can sanded smooth given several coats clear fuelproof dope sand ing note necessary model sort round edges Just make fuselage smooth wing may unusual trainer days built-up con struction brave heart weve designed easy strong construc tion First will need flat building surface cover plan sheet clear plastic such food wrap dry cleaners bag precaution taken prevent plan becoming part model Lay spruce lead ing trailing edge spars position over plan glue wing ribs place ribs followed two spruce upper spars balsa leading edge Allow dry overnight plane carve sand leading edge shape Sand entire structure smooth add line guide wing tip weight cover silk Coverite search recent model magazines should quickly disclose detailed articles regarding use covering materials Apply several coats clear fuelproof dope seal surface stabilizer elevator simply cut shape edges sanded round surfaces hinged together doping surfaces make sure dope does cause hinges bind free dom movement essential option al fin may omitted Primary trainer really doesnt need flight though fin does quite lot ships appearance Now get hardware stage construction Bend wire landing gear Left Wing mount made thin plywood soaked water shaped rubberbanding over block ribs resting against sturdy strip February 1977 27 Above Parts Primary Trainer advis able cut Out parts first construction goes quickly smoothly Below The plywood leadout guide attached inboard wing tip Right wing weight glued against tip block outboard wing against two top spars Below R Compare picture plans wing Above Plywood nose doublers after gluing fuselage necessary holes neatly drilled Large hole bellcrank mount PBA Special shape secure wheels place Various types wheel collars avail able hobby shop re tain wheels prefer solder washers wire task land ing gear slipped over top fuse lage secured metal- plastic landing gear clips bolts small stunt-type fuel tank held wire hooks passed through fuselage rubberbands passing hook hook around tank control system consists bellcrank flexible leadouts bolted T-shaped plywood mount control horn bolted elevator stiff wire pushrod connecting control horn bellcrank stabilizer secured its mounting plate small bolts nuts wing held rather like Cox PT19 several strong rubberbands run ning front dowel under wing aft dowel Make sure very securely done matter mounting engine have deliberately left last engine broken-in familiar engine would best mount engine wooden test stand never vise run least few tankfuls fuel through engine yourself thus prepared bolt securely place airplane sure place two flat washers between engine mounting lugs bearers two front bolts order slightly slant engine outwards will help hold model tight lines engine connected fuel tank length fuel line tubing new ship should just about ready flight first check airplanes bal ance carefully ship does balance point shown plan add weight nose tail until does Now aerodome model such will fly well either short grass paved areas As select flying site consider carefully safety aspects such no power phone lines nearby no traffic children might wander flight circle Con sider too noise aspect after some quite thrilled inspiring sound course town enlightened enough have municipal circles much better control lines recommend strand ed cable wire lines 015 diameter 52 ft long can purchased ready use form will care last long time Connect lines models leadouts using large size line connectors hobby shop Snap swivels fishing box definite no-no Roll wire out carefully connect line connectors control handle Now check lines straight untwisted taut Next pull back up line top control han dle elevator plane should move up doesnt dont get excited just switch lines handle Okay pull top handle back ele vator goes up vice versa Good Now adjust cable leadout device handle handle straight up down elevator will straight back time youll need have few words helper Since hell holding machine youre picking up handle make sure knows signal youll give him release ship Also should know model must take off straight ahead itw LzJ 0 0 Lii LU cn Lii -j -J z -j LU N -j -J Uself no push shove help along Also unlike full-size aircraft control-line models positioned take off downwind downwind take off builds speed help keep controling wires taut beginners usual difficulty over control notable very short porpoising sort flight prevent move wrist order di rect model instead lock wrist elbow too considering arm stiff rigid movable shoulder Got Okay want $1 E I/SX 3/4 SPRUCI II LEADING EDGE LINE GUIDEPRIMARY WING LINE GUIDE SUPPORT PERFECT No7 TANKI/16PLY WING PLATFORM LANDING GEAR ER BANDS / / / BELLCRANK MOUNT II I I I [ 032 045 WIRE FUEL TANK STRAP 2 SEND ENDS AFTER INSERTING THROUGH FUSE LAGE NOTE DRILL HOLES TO SUIT ENGINE TO BE USED AIRPLANE IS DESIGNED FOR 19 CU IN DISPLACEMENT ENGINES U1 / I\ IQlJA 3 CRANI TRIANGULAR BALSA\ REINFORCEMENT 2 2ZPVGIAIE1/4 BEAp~5 7 Th~:A0 o 7 10I 0o LANONG SWING WING 2WHEELS WING RI SOLDERED CI EVISPUS BRASS TUBE ADAPTORS FDA SPEC/AL MULTI-PURPOSE CL TRAINER THIS PAGE SHOWS ENTIRE PRIMARY AIRPLANE OPSIGNED BY FRANK SCOTT 28 Model Aviation plane rise raise whole arm way elevators will seem much less responsive resulting flight will much smoother safety thongs wrist now controls check out heart crowding Adams apple Theres nothing now give helper launch signal As ship starts roll hold arm straight out thus producing neutral elevator same time take easy step backwards help keep flying lines tight Remember control lines slack plane out control As plane speeds up gently give tiny bit up control plane should rise Neutral elevator will cause ship level off However cause lifting-type airfoil used surprised bit down eleva tor control needed fly level As plane flies around its circular flight path will probably find experience less dizzying instead turning place grinding heel ground walk plane small circle So out center flying circle now engine running helper holding ship fuselage outboard wing tip watching release signal Pick up control handle slip safety thong over wrist check youve got handle right side up giving up elevator seeing airplanes elevator does deed move up Check also neutral down No matter what sort com petitive sport CL events may choose fly later foregoing should always part routine before flight signal land loud silence engine runs out gas Landing l/4X 3/B BALSA FALSE LEADING EDGE jii 3/16SQ SPRUCE SPARS I/B RIBS ikI/2ROOT RIB I/B GUSSETSI/BX 3/4 SPRUCE TRAILING EDGE ' I /4 PLY BELLCRANI MT QKIIJ STAB REINFORCEMENT I/BX 1/4 SPRUCE UNDER SIDE ONLY I/B STABILIZER ELEVATOR STAB SUPPORT I/1B PLY 2 J I/2TIP RIBS Ut IDIA WING HOLDTRIANGULAR BALSAAPPROX 3/B RIGHT WN DOWELSREINFORCEMENT TOP ONLY __________________MAIN LANDING GEAR 9HORN 16 PLY FUSELAGEDOUBLER 2\t \ / I/B DIA I/IBDIA zi 1/4 DIAI I/B FIN B RUDDER IOPTIONAL NOTE PUSH ROD IS NOT SHOWN IN TOP OR SIDE VIEWS S USED TO CONNECT BELLCRANK TO ELEVATOR HORNFABRIC HINGES AGE /a 8Ls4ILI2 0FORM 32 MUSIC WIRE7GRASS TUBE TOR1~~JSTABLE CLEVIS I/IS WIRE TAILSKID February 1977 29 I/B PLY LINE GUIDE zIj NOTENO FIN OR RUDDER ARE REQUIRED BY THIS MODEL FOR SATISFACTORY FLIGHT 0 PRIMARY TRAINER CONTROL SENSITIVITY IS REDUCED THUS MAKING MODEL EASIER TO FLY BY CONNECTING THE PUSH ROD TO THE INNER MOST BELLCRANK HOLE AND OUTERMOST ELEVATOR HORN HOLE 0 ANGLING THE ENGINE TOWARDS THE OUTSIDE OF THE FLYING CIRCLE BY PLACING TWO WASHERS UNDER THE FRONT OF ENGINE LUGS WILL HELP KEEP CONTROL LINES TAUT NOTE THE FORWARD PLACEMENT OF THE LANDING GEAR HELPS TO STABILIZE THE MODEL IN FLIGHT BY BRINGING THE CENTER OF GRAVITY NCE POINT CLOSER TO THE NOSE OF THE AIRPLANE three drawings shown opposite page describe show features three air planes What makes 3-in-i design feasible employment wing saddle wings can strap BASIC TRAINER U ENLARGED ELEVATORS ARE FITTED TO IMPROVE CONTROL RESPONSIVENESS THE USE OF SYMETRICAL AIRFOIL SECTION ALLOWS THE WING TO FUNCTION EFFICIENTLY WHEN FLYING INVERTED r 0 NOTE MOVING THE LANDING GEAR BACK LESSENS BOUNCING AND BY SHIFTING THE MODELS BALANCE POINT REARWARD QUICKENS CONTROL RESPONSE THE OFFSETTING OF THE RUDDER TENDS TO TURN THE MODEL OUTWARDS tHUS HELPING KEEP CONTROL LINES TAUT II _____________ 30 Model Aviation D g 4 PBA Special easy no matter what model going come down trick bring down damage good procedure smooth landing sim ply maintain neutral elevator allowing model glide itself easily down ground practice youll get knack gradually feeding up elevator just ship skimming ground resulting applause getting three-point landing flight short because small fuel tank inasmuch taking off landing challenging parts learning fly level flights long du ration likely cause beginners dizziness believe number short flights will much productive few long flights fun too beginning try avoid model climbing high especially upwind side circle wind may cause plane drift toward causing slack lines loss control detect happening move back ward few steps necessaryquickly mustwhich will help maintain cru cial line tension practice wish model climb descend always perform climb downwind side circle no means should ever fly vicinity power lines current can jump lines actual contact being made Repeat fly anywhere near power lines So build Primary PBA Special practice flying round round next month well show convert Basic Mode fly upside down fl IT IS VERY IMPORTANT THAT FLAP EQUIPTED CL MODELS HAVE THEIR CONTROL SYSTEMS SET UP SO THAT THE MOTION OF THE FLAPS IS IN OPPOSITION TO THAT OF THE ELEVATORS li-n 3 NOTE THAT FLAPS ARE RIGGED TO MOVE APPROXIMATELY ONE-THIRD OF THE TRAVEL OF THE ELEVATORS airplane IS designed grow advancing flying skillsthe Primary Trainer fin appears photos because standard fuselage used same day make pictures three versions ship Article includes excellent flight instructions THE USE OF WING FLAPS INCREASE WING LIFT AS MODEL FLIES THROUGH MANEUVERS RESULTING IN SMOOTHER FLIGHT iT ADVANCED TRAINER
Edition: Model Aviation - 1977/02
Page Numbers: 26, 27, 28, 29, 30, 31
QLXI SDCCIdL Frank Scott THE IDEAL control-line trainer has long elusive sort bird curiously enough successful trainer less often will flown reason ing really well-conceived trainer will quickly prepare fledgling exciting craft having thus mastered lowly seeming yet important trainer flier will abandon air planes better suited advanced flying PBA Special design tended grow fliers capabilities Starting sturdy steady Primary train er new wing becoming Basic stunt trainer addition wing flaps metamorphosis com pleted Advanced stunt trainer PBA Special thus much like Army Air Corps training program World War II Cadet started off Primary trainers learned get up back down breaking anything expensive gradu ated spritely Basic trainers really learned fly finally training completed Advanced train ers taught him use air plane So much philosophy lets get building unique ship will first notice PBA Special de signed 19-size engines Like aircraft compromise affair gen erally recognized little half-A mo& els cheaper dont crash hard larger class ships easier fly dont crash often larger 26 Model Aviation Plans instructions unique universal 1 9-powered CL trainer presented two installments primary trainer covered month will take interchangeable wings tail Basic Advanced configurationsto shown next issue size will also allow model fly grass longer flying lines will re duce possibility flier becoming bit dizzy Also modular design promotes growth also facilitates repairs may horrors become necessary keeping nature model project will presented magazine two installments first installment will complete Pri mary airplane can get started building right away flying fore next issue Well begin construction fuse lage since sooner later other components will attached thereto sheet-balsa fuselage sawn shape hardwood engine bearers plywood side doublers securely glued place recommend use Titebond glue throughout will require great clamp ing force prevent plywood nose doublers warping away balsa core water-based glue drying assembly has dried mounting holes should drilled such drilling much easier now later wing saddle next prepared thoroughly soaking plywood saddle very hot water has become somewhat pliable holding securely against suitable form used wing cut-out piece fuselage until quite dry formed saddle glued fuselage assembly reinforced triangular stock balsa fillets Note Fly-by shows clearly flat-bottomed wing Primary Trainer Both wing tail removable surfaces Basic Advanced ver sions can used same fuselage Left Daughter Jeanetteves flieswith Primary Trainer Half As cheaper bounce around bigger ships crack up less often Wing built-upbut quite strong simple will necessary cut way through fillets several places order conform saddles curva ture Balsa filler may used fill several slits flat plywood stabilizer mount secured similar manner Care should taken T-shaped bellcrank mount inserted its slot right side Its shape insures control system cannot pulled out course important safety consid eration Mount wire tail skid using cloth patch glue Also glue wing mounting dowels time fuselage can sanded smooth given several coats clear fuelproof dope sand ing note necessary model sort round edges Just make fuselage smooth wing may unusual trainer days built-up con struction brave heart weve designed easy strong construc tion First will need flat building surface cover plan sheet clear plastic such food wrap dry cleaners bag precaution taken prevent plan becoming part model Lay spruce lead ing trailing edge spars position over plan glue wing ribs place ribs followed two spruce upper spars balsa leading edge Allow dry overnight plane carve sand leading edge shape Sand entire structure smooth add line guide wing tip weight cover silk Coverite search recent model magazines should quickly disclose detailed articles regarding use covering materials Apply several coats clear fuelproof dope seal surface stabilizer elevator simply cut shape edges sanded round surfaces hinged together doping surfaces make sure dope does cause hinges bind free dom movement essential option al fin may omitted Primary trainer really doesnt need flight though fin does quite lot ships appearance Now get hardware stage construction Bend wire landing gear Left Wing mount made thin plywood soaked water shaped rubberbanding over block ribs resting against sturdy strip February 1977 27 Above Parts Primary Trainer advis able cut Out parts first construction goes quickly smoothly Below The plywood leadout guide attached inboard wing tip Right wing weight glued against tip block outboard wing against two top spars Below R Compare picture plans wing Above Plywood nose doublers after gluing fuselage necessary holes neatly drilled Large hole bellcrank mount PBA Special shape secure wheels place Various types wheel collars avail able hobby shop re tain wheels prefer solder washers wire task land ing gear slipped over top fuse lage secured metal- plastic landing gear clips bolts small stunt-type fuel tank held wire hooks passed through fuselage rubberbands passing hook hook around tank control system consists bellcrank flexible leadouts bolted T-shaped plywood mount control horn bolted elevator stiff wire pushrod connecting control horn bellcrank stabilizer secured its mounting plate small bolts nuts wing held rather like Cox PT19 several strong rubberbands run ning front dowel under wing aft dowel Make sure very securely done matter mounting engine have deliberately left last engine broken-in familiar engine would best mount engine wooden test stand never vise run least few tankfuls fuel through engine yourself thus prepared bolt securely place airplane sure place two flat washers between engine mounting lugs bearers two front bolts order slightly slant engine outwards will help hold model tight lines engine connected fuel tank length fuel line tubing new ship should just about ready flight first check airplanes bal ance carefully ship does balance point shown plan add weight nose tail until does Now aerodome model such will fly well either short grass paved areas As select flying site consider carefully safety aspects such no power phone lines nearby no traffic children might wander flight circle Con sider too noise aspect after some quite thrilled inspiring sound course town enlightened enough have municipal circles much better control lines recommend strand ed cable wire lines 015 diameter 52 ft long can purchased ready use form will care last long time Connect lines models leadouts using large size line connectors hobby shop Snap swivels fishing box definite no-no Roll wire out carefully connect line connectors control handle Now check lines straight untwisted taut Next pull back up line top control han dle elevator plane should move up doesnt dont get excited just switch lines handle Okay pull top handle back ele vator goes up vice versa Good Now adjust cable leadout device handle handle straight up down elevator will straight back time youll need have few words helper Since hell holding machine youre picking up handle make sure knows signal youll give him release ship Also should know model must take off straight ahead itw LzJ 0 0 Lii LU cn Lii -j -J z -j LU N -j -J Uself no push shove help along Also unlike full-size aircraft control-line models positioned take off downwind downwind take off builds speed help keep controling wires taut beginners usual difficulty over control notable very short porpoising sort flight prevent move wrist order di rect model instead lock wrist elbow too considering arm stiff rigid movable shoulder Got Okay want $1 E I/SX 3/4 SPRUCI II LEADING EDGE LINE GUIDEPRIMARY WING LINE GUIDE SUPPORT PERFECT No7 TANKI/16PLY WING PLATFORM LANDING GEAR ER BANDS / / / BELLCRANK MOUNT II I I I [ 032 045 WIRE FUEL TANK STRAP 2 SEND ENDS AFTER INSERTING THROUGH FUSE LAGE NOTE DRILL HOLES TO SUIT ENGINE TO BE USED AIRPLANE IS DESIGNED FOR 19 CU IN DISPLACEMENT ENGINES U1 / I\ IQlJA 3 CRANI TRIANGULAR BALSA\ REINFORCEMENT 2 2ZPVGIAIE1/4 BEAp~5 7 Th~:A0 o 7 10I 0o LANONG SWING WING 2WHEELS WING RI SOLDERED CI EVISPUS BRASS TUBE ADAPTORS FDA SPEC/AL MULTI-PURPOSE CL TRAINER THIS PAGE SHOWS ENTIRE PRIMARY AIRPLANE OPSIGNED BY FRANK SCOTT 28 Model Aviation plane rise raise whole arm way elevators will seem much less responsive resulting flight will much smoother safety thongs wrist now controls check out heart crowding Adams apple Theres nothing now give helper launch signal As ship starts roll hold arm straight out thus producing neutral elevator same time take easy step backwards help keep flying lines tight Remember control lines slack plane out control As plane speeds up gently give tiny bit up control plane should rise Neutral elevator will cause ship level off However cause lifting-type airfoil used surprised bit down eleva tor control needed fly level As plane flies around its circular flight path will probably find experience less dizzying instead turning place grinding heel ground walk plane small circle So out center flying circle now engine running helper holding ship fuselage outboard wing tip watching release signal Pick up control handle slip safety thong over wrist check youve got handle right side up giving up elevator seeing airplanes elevator does deed move up Check also neutral down No matter what sort com petitive sport CL events may choose fly later foregoing should always part routine before flight signal land loud silence engine runs out gas Landing l/4X 3/B BALSA FALSE LEADING EDGE jii 3/16SQ SPRUCE SPARS I/B RIBS ikI/2ROOT RIB I/B GUSSETSI/BX 3/4 SPRUCE TRAILING EDGE ' I /4 PLY BELLCRANI MT QKIIJ STAB REINFORCEMENT I/BX 1/4 SPRUCE UNDER SIDE ONLY I/B STABILIZER ELEVATOR STAB SUPPORT I/1B PLY 2 J I/2TIP RIBS Ut IDIA WING HOLDTRIANGULAR BALSAAPPROX 3/B RIGHT WN DOWELSREINFORCEMENT TOP ONLY __________________MAIN LANDING GEAR 9HORN 16 PLY FUSELAGEDOUBLER 2\t \ / I/B DIA I/IBDIA zi 1/4 DIAI I/B FIN B RUDDER IOPTIONAL NOTE PUSH ROD IS NOT SHOWN IN TOP OR SIDE VIEWS S USED TO CONNECT BELLCRANK TO ELEVATOR HORNFABRIC HINGES AGE /a 8Ls4ILI2 0FORM 32 MUSIC WIRE7GRASS TUBE TOR1~~JSTABLE CLEVIS I/IS WIRE TAILSKID February 1977 29 I/B PLY LINE GUIDE zIj NOTENO FIN OR RUDDER ARE REQUIRED BY THIS MODEL FOR SATISFACTORY FLIGHT 0 PRIMARY TRAINER CONTROL SENSITIVITY IS REDUCED THUS MAKING MODEL EASIER TO FLY BY CONNECTING THE PUSH ROD TO THE INNER MOST BELLCRANK HOLE AND OUTERMOST ELEVATOR HORN HOLE 0 ANGLING THE ENGINE TOWARDS THE OUTSIDE OF THE FLYING CIRCLE BY PLACING TWO WASHERS UNDER THE FRONT OF ENGINE LUGS WILL HELP KEEP CONTROL LINES TAUT NOTE THE FORWARD PLACEMENT OF THE LANDING GEAR HELPS TO STABILIZE THE MODEL IN FLIGHT BY BRINGING THE CENTER OF GRAVITY NCE POINT CLOSER TO THE NOSE OF THE AIRPLANE three drawings shown opposite page describe show features three air planes What makes 3-in-i design feasible employment wing saddle wings can strap BASIC TRAINER U ENLARGED ELEVATORS ARE FITTED TO IMPROVE CONTROL RESPONSIVENESS THE USE OF SYMETRICAL AIRFOIL SECTION ALLOWS THE WING TO FUNCTION EFFICIENTLY WHEN FLYING INVERTED r 0 NOTE MOVING THE LANDING GEAR BACK LESSENS BOUNCING AND BY SHIFTING THE MODELS BALANCE POINT REARWARD QUICKENS CONTROL RESPONSE THE OFFSETTING OF THE RUDDER TENDS TO TURN THE MODEL OUTWARDS tHUS HELPING KEEP CONTROL LINES TAUT II _____________ 30 Model Aviation D g 4 PBA Special easy no matter what model going come down trick bring down damage good procedure smooth landing sim ply maintain neutral elevator allowing model glide itself easily down ground practice youll get knack gradually feeding up elevator just ship skimming ground resulting applause getting three-point landing flight short because small fuel tank inasmuch taking off landing challenging parts learning fly level flights long du ration likely cause beginners dizziness believe number short flights will much productive few long flights fun too beginning try avoid model climbing high especially upwind side circle wind may cause plane drift toward causing slack lines loss control detect happening move back ward few steps necessaryquickly mustwhich will help maintain cru cial line tension practice wish model climb descend always perform climb downwind side circle no means should ever fly vicinity power lines current can jump lines actual contact being made Repeat fly anywhere near power lines So build Primary PBA Special practice flying round round next month well show convert Basic Mode fly upside down fl IT IS VERY IMPORTANT THAT FLAP EQUIPTED CL MODELS HAVE THEIR CONTROL SYSTEMS SET UP SO THAT THE MOTION OF THE FLAPS IS IN OPPOSITION TO THAT OF THE ELEVATORS li-n 3 NOTE THAT FLAPS ARE RIGGED TO MOVE APPROXIMATELY ONE-THIRD OF THE TRAVEL OF THE ELEVATORS airplane IS designed grow advancing flying skillsthe Primary Trainer fin appears photos because standard fuselage used same day make pictures three versions ship Article includes excellent flight instructions THE USE OF WING FLAPS INCREASE WING LIFT AS MODEL FLIES THROUGH MANEUVERS RESULTING IN SMOOTHER FLIGHT iT ADVANCED TRAINER