CONTROL LINE AEROBATICS READERS OF THIS COLUMN will recognize Ron Bum master builder near-scale Stunters latest Maccii extraordinary example Scale techniquesboth finish fidelity month Ill highlight molded-component technology Ron used fine model wing true monocoque structurea one-piece molded surface carbon/balsa/carbon carbon 1/2-ounce mat balsa 6- 8-pound o sheet Other composite combinations tried including carbonlKevlar glass/glass Kevlar/Kevlar carbon/carbon combination best combination strength stiffness Kevlar very strong very stiff skin-molding process falrly straightforward solid wing core cut dense 3-pound blue foam re-cut 080 undersize Its covered piece 010 Mylar using 3M Super Spray Trim Adhesive vacuum-bagged 12 hours spruce trailing edge epoxied core parting agent applied second piece 010 Mylar cut size covers core inch front trailing edge forward around leading edge back inch front tralling edge balsa skin laid up same size second Mylar skin grain used leading edge portion Two carbon skins also cut Mylar pattern Mylar coated parting agent three skins laid up epoxy second Mylar approximately 1/2. -ounce EZ Lam 60 minutes per layer assembly wrapped around prepared core retained masking tape tape applied chordwise pull Mylar cover sheet composite tight against leading edge pulling against spruce trailing edge core bagged approximately 18 inches mercury minimum 12 hours After removing outer Mylar core trailing edges beveled inside allow bonding true sharp trailing edge Ribs made cutting up corethe same method Bob Hunt uses Only four ribs used Two support gear blocks tip has intermediate location adding skin support preventing buckling under compression loads spars ribs gear blocks controls preassembled foam cradle rib core skin composite blocked open trailing edge spar/rib assembly slipped preglued slow cyanoacrylate CyA trailing edge glued slow CyA assembly placed back original cradles cure Tips carved blue foam covered 3/4-ounce glass cloth Theyre hollowed minimum thickness finished wing has area 735 square inches landing gear wheels tips controls hinges paint weighs 22 ounces Macchis fuselage shell construction also interesting Its formed three layers 1/32 sheet balsa Two layers 450 angle layer runs longitudinally balsa laid up over foam core Its sliced bulkhead locations keyed together 1 x 2 plywood inserted through nose ring form wrapped plastic kitchen wrap wrap retained masking tape wound sticky-side-out spiral nose tail tape retains first ply balsa Subsequent layers applied 3M spray adhesive ply wetted outside aid forming assembly wrapped elastic bandage allowed dry before additional layers added tedious part cutting fill pieces inevitable gaps produced forming compound surfaces orthogonal shapes After final layer has dried 12 24 hours core removed cutting wing saddle removing plywood key taking pieces out through wing saddle opening point shell weighed 383 ouncesgood fuselage size Its 48 inches long nose ring stabilizer spar 9 inches deep cockpit Much preceding information extracted Rons letters fortunate have builders like Ron push envelope generous enough share hard-earned knowledge really appreciate efforts Ron Technical Discussioa Several columns ago mentioned Simple Green liquid cleaner does amazing job cleaning Rapidograph-type pens Well Simple Green saga continues Im still using selfadhesive vinyl shelf liner make stencils numbers letters Using material sometimes causes problems example its old stencil adhesive can remain surface after stencil removed can also happen new material surface shot wet coat really doesnt affect paint job its pain cleaning off residue Ive using Prep Sol works requires bit patience Because Simple Green worked well pen decided try adhesive removed residue nicely much faster Prep Sol used Prep Sol afterwards just sure 116 Model Aviation Burns carbon-composite wing skin its interior structure Construction method detailed text Jim Hunts fuselage construction jig action Shot prototype shows Bob Hunt Cross Fire under construction fuselage mold Ron Burns Macchi Note 1 x 2 plywood key holds foam core pieces together Later noticed couple Simple Green spots bottom airplane removed spots Prep Sol paint came off right down blocking coat bottom line careful using cleaning product Dont let remain surface Ill continue use Simple Green Ill much careful carbon props Theres no question thinner stiffer blades efficient An added benefit props its possible tweak pitch warming blades resetting pitch pitch gauge two ways heat blades involves boiling water other heat gun prefer heat-gun method Its easier isolate various stations prop way props have memory tend eventually creep back original molded-in settings happens lesser degree the props reset never really goes away will have periodically repitched Repitching usually needed airplane starts exhibit unusual flight characteristics such loss line tension unexpected wind-up heavy air Good procedure dictates rechecking obvious Its handy have standard comparison best approach go back recheck pitch profile pitch gauge blade best prop moved slightly blade different much 1/2 inch several stations plus minus added Something wasnt rightthe way found problem using pitch gauge prop repitched everything returned normal New Items Over years Ive seen lot building aids Often prove lessthan-useful under close examination However fuselage jig designed manufactured Jim Hunt something else entirely No can argue airplane will fly better accurately constructed best way guarantee use jig construct various assemblies Jim has engineered jig both accurate stable plywood base reinforced bottom dead-straight steel channels milled-aluminum right angles hold fuselage pieces slide precisely machined slots lock place heavy bolts after adjustment Its simple set up Center top-view fuselage fix aluminum sliders position Just drop pieces wait glue dry Presto straight accurate assembly Ive wanted ajig like years its tool will use life Jim has limited production run ready delivery Contact him 205 E Center St Stockertown PA 18082 Tel 610746-0106 MODEL CO 290W 1050 N LAYTON UE 84041 PHONE 801544-5689 Coil Send $300 Color Brochure 13 %Credi Ordor ADD $1395 SHLPPLNG/HANDLIND IT RES ADD 625% TAX SWOOSHIEm BAILS OUT Release scalel ike Paradiutistl real crowd pleaser lot af funl Fl orange ar Fl pInk sport yellow red white blue ar ama Complete figure & release system $1895 ea plus $325 S/H NEW COLORS FOR 19951 Add $1 Red White & Blue Combo HOBBY HUT MANUFACTURING 2020 W list St N Suits #77 Wichita KS 67203-2107 Dept MRV send SASE brochure PRODUCTS Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes Headers Venturi Mufflers Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems Unsupassd Wokmanshlp # Performance visaBJrn/C ELECTRONICS CARLSON ENGINE IMPORTS Czech- MP JETS 061 September1995 117 DELUXE KIT sPECIrICATIONS Engine- 25-402 cycle 40 48 4-Cycle Radio 3-Channel WE HAVE OVER 26 YEARS EXPERIENCE IN RC AT WE 1466 windward dr mason ohio 45040 ph 513 398-5423 WANTED Ignition Model Engines 1930s 1950s Elf Baby Cyclone Brown Jr Super Cyclone Ohisson Etc ALSO Model Race Cars & Boats Any Parts Spark Plugs Etc Parts Available Most Ignition Engines Catalog $600 US $800 Intl Woody Bartelt Aero Electric 1301 W Lafayette Sturgis MI 49091 800-982-5464 616-665-9693 Plain Bearing Glow 5000 5500 8000 Ball Bearing Glow 850070007500 Ball Bearing Diesel 650070007500 engines include silencer AddMOOP&H pee Order VIsa&M/C OK 7CIU seat Sddiea Ses Carison Engine Imports- 814 E Marconi Ave Phoenix Az USA 85022- Ph/Fax 602-863-1684 gapnrnt.Iasrns Fnar FirmaAIn L. Ienorney Arniluble Bildrs 60 $255She.d Co $36501, Sheeled 601495 255 Inn Ahloed/PO Inn 727/Sad Springs Idaha 83276 ULTIMATESPORT RC auliwi so-ala mis1-208-5473742For Fnh rio Send SA5E
Edition: Model Aviation - 1995/09
Page Numbers: 116, 117
CONTROL LINE AEROBATICS READERS OF THIS COLUMN will recognize Ron Bum master builder near-scale Stunters latest Maccii extraordinary example Scale techniquesboth finish fidelity month Ill highlight molded-component technology Ron used fine model wing true monocoque structurea one-piece molded surface carbon/balsa/carbon carbon 1/2-ounce mat balsa 6- 8-pound o sheet Other composite combinations tried including carbonlKevlar glass/glass Kevlar/Kevlar carbon/carbon combination best combination strength stiffness Kevlar very strong very stiff skin-molding process falrly straightforward solid wing core cut dense 3-pound blue foam re-cut 080 undersize Its covered piece 010 Mylar using 3M Super Spray Trim Adhesive vacuum-bagged 12 hours spruce trailing edge epoxied core parting agent applied second piece 010 Mylar cut size covers core inch front trailing edge forward around leading edge back inch front tralling edge balsa skin laid up same size second Mylar skin grain used leading edge portion Two carbon skins also cut Mylar pattern Mylar coated parting agent three skins laid up epoxy second Mylar approximately 1/2. -ounce EZ Lam 60 minutes per layer assembly wrapped around prepared core retained masking tape tape applied chordwise pull Mylar cover sheet composite tight against leading edge pulling against spruce trailing edge core bagged approximately 18 inches mercury minimum 12 hours After removing outer Mylar core trailing edges beveled inside allow bonding true sharp trailing edge Ribs made cutting up corethe same method Bob Hunt uses Only four ribs used Two support gear blocks tip has intermediate location adding skin support preventing buckling under compression loads spars ribs gear blocks controls preassembled foam cradle rib core skin composite blocked open trailing edge spar/rib assembly slipped preglued slow cyanoacrylate CyA trailing edge glued slow CyA assembly placed back original cradles cure Tips carved blue foam covered 3/4-ounce glass cloth Theyre hollowed minimum thickness finished wing has area 735 square inches landing gear wheels tips controls hinges paint weighs 22 ounces Macchis fuselage shell construction also interesting Its formed three layers 1/32 sheet balsa Two layers 450 angle layer runs longitudinally balsa laid up over foam core Its sliced bulkhead locations keyed together 1 x 2 plywood inserted through nose ring form wrapped plastic kitchen wrap wrap retained masking tape wound sticky-side-out spiral nose tail tape retains first ply balsa Subsequent layers applied 3M spray adhesive ply wetted outside aid forming assembly wrapped elastic bandage allowed dry before additional layers added tedious part cutting fill pieces inevitable gaps produced forming compound surfaces orthogonal shapes After final layer has dried 12 24 hours core removed cutting wing saddle removing plywood key taking pieces out through wing saddle opening point shell weighed 383 ouncesgood fuselage size Its 48 inches long nose ring stabilizer spar 9 inches deep cockpit Much preceding information extracted Rons letters fortunate have builders like Ron push envelope generous enough share hard-earned knowledge really appreciate efforts Ron Technical Discussioa Several columns ago mentioned Simple Green liquid cleaner does amazing job cleaning Rapidograph-type pens Well Simple Green saga continues Im still using selfadhesive vinyl shelf liner make stencils numbers letters Using material sometimes causes problems example its old stencil adhesive can remain surface after stencil removed can also happen new material surface shot wet coat really doesnt affect paint job its pain cleaning off residue Ive using Prep Sol works requires bit patience Because Simple Green worked well pen decided try adhesive removed residue nicely much faster Prep Sol used Prep Sol afterwards just sure 116 Model Aviation Burns carbon-composite wing skin its interior structure Construction method detailed text Jim Hunts fuselage construction jig action Shot prototype shows Bob Hunt Cross Fire under construction fuselage mold Ron Burns Macchi Note 1 x 2 plywood key holds foam core pieces together Later noticed couple Simple Green spots bottom airplane removed spots Prep Sol paint came off right down blocking coat bottom line careful using cleaning product Dont let remain surface Ill continue use Simple Green Ill much careful carbon props Theres no question thinner stiffer blades efficient An added benefit props its possible tweak pitch warming blades resetting pitch pitch gauge two ways heat blades involves boiling water other heat gun prefer heat-gun method Its easier isolate various stations prop way props have memory tend eventually creep back original molded-in settings happens lesser degree the props reset never really goes away will have periodically repitched Repitching usually needed airplane starts exhibit unusual flight characteristics such loss line tension unexpected wind-up heavy air Good procedure dictates rechecking obvious Its handy have standard comparison best approach go back recheck pitch profile pitch gauge blade best prop moved slightly blade different much 1/2 inch several stations plus minus added Something wasnt rightthe way found problem using pitch gauge prop repitched everything returned normal New Items Over years Ive seen lot building aids Often prove lessthan-useful under close examination However fuselage jig designed manufactured Jim Hunt something else entirely No can argue airplane will fly better accurately constructed best way guarantee use jig construct various assemblies Jim has engineered jig both accurate stable plywood base reinforced bottom dead-straight steel channels milled-aluminum right angles hold fuselage pieces slide precisely machined slots lock place heavy bolts after adjustment Its simple set up Center top-view fuselage fix aluminum sliders position Just drop pieces wait glue dry Presto straight accurate assembly Ive wanted ajig like years its tool will use life Jim has limited production run ready delivery Contact him 205 E Center St Stockertown PA 18082 Tel 610746-0106 MODEL CO 290W 1050 N LAYTON UE 84041 PHONE 801544-5689 Coil Send $300 Color Brochure 13 %Credi Ordor ADD $1395 SHLPPLNG/HANDLIND IT RES ADD 625% TAX SWOOSHIEm BAILS OUT Release scalel ike Paradiutistl real crowd pleaser lot af funl Fl orange ar Fl pInk sport yellow red white blue ar ama Complete figure & release system $1895 ea plus $325 S/H NEW COLORS FOR 19951 Add $1 Red White & Blue Combo HOBBY HUT MANUFACTURING 2020 W list St N Suits #77 Wichita KS 67203-2107 Dept MRV send SASE brochure PRODUCTS Complete Line Exhaust Systems * Tuned Pipes led Tuned Pipes Headers Venturi Mufflers Expansion Mufflers copter Ball Mufflers ialized Exhaust Systems Unsupassd Wokmanshlp # Performance visaBJrn/C ELECTRONICS CARLSON ENGINE IMPORTS Czech- MP JETS 061 September1995 117 DELUXE KIT sPECIrICATIONS Engine- 25-402 cycle 40 48 4-Cycle Radio 3-Channel WE HAVE OVER 26 YEARS EXPERIENCE IN RC AT WE 1466 windward dr mason ohio 45040 ph 513 398-5423 WANTED Ignition Model Engines 1930s 1950s Elf Baby Cyclone Brown Jr Super Cyclone Ohisson Etc ALSO Model Race Cars & Boats Any Parts Spark Plugs Etc Parts Available Most Ignition Engines Catalog $600 US $800 Intl Woody Bartelt Aero Electric 1301 W Lafayette Sturgis MI 49091 800-982-5464 616-665-9693 Plain Bearing Glow 5000 5500 8000 Ball Bearing Glow 850070007500 Ball Bearing Diesel 650070007500 engines include silencer AddMOOP&H pee Order VIsa&M/C OK 7CIU seat Sddiea Ses Carison Engine Imports- 814 E Marconi Ave Phoenix Az USA 85022- Ph/Fax 602-863-1684 gapnrnt.Iasrns Fnar FirmaAIn L. Ienorney Arniluble Bildrs 60 $255She.d Co $36501, Sheeled 601495 255 Inn Ahloed/PO Inn 727/Sad Springs Idaha 83276 ULTIMATESPORT RC auliwi so-ala mis1-208-5473742For Fnh rio Send SA5E