CONTROL LINE AEROBATICS S Nationals Nats still fresh thought would comment some technical points competition didnt have space last months coverage some interesting approaches getting same high performance higher placings performance level has raised various packages display exceptional drive very light air conditions pilots able hit extremely hard corners still have consistent precise bottoms demands moderate-to-light models ton horsepower under control would characterize power package year maturing newer engines such Precision Aeros have used several years running betterif thats possiblebecause pilots higher up learning curve top fliers use venerable ST 60 such Windy Urtnowski Bob Baron Bill Saurez achieving excellent results through continued fine-tuning propellers fuel problem older engines keeping running since have r out production years conditions years Nats significantly different 1997 Most fliers realizing power before looking control power saw charging Out January1999 135 Bob McDonalds signature design Unlimited P-47 superb flier molded parts PA 61 pipe w - Gerald Clarks 40-year-old Sportster carries Ken BarbieTM K&B 45 flies well Looks like early full-scale Vega Jack Sunderland Classic Stunter Design aerobatic team colors Windy Urtnowskis Cardinal upcoming Brodak kit Based SOs Hawker Hunter British fighter Brodak Fly-in successful mid-sized model profile transition competition corners various combinations reduced compression propeller diameter/pitch pipe length changes reduction nitromethane used After competition finished few fliers shared knowledge flying others models Friday evening has evolved fly-in features everyone benefits Several new airplanes drew attention years Nats Bob McDonalds exceptional Unlimited class racer constructed using tooling Bill Werwages semiscale P-47s Bobs model look what P-47 converted full-scale Unlimited racer would should model well-executed well-flown drew attention time air David Fitzgerald new Star Gazer Ted Fancher flew Final Edition both derivatives Teds design Davids newest reflected efforts tracking tail configurations exceptional 57 ounces very strong performer Ted done exceptional refinish latest using automotive two-part polyurethanes winding up front row modifications stabilizer sharper leading edge savings three ounces really showed great bottoms Well worth overall effort Tech Tips Unless until appearance points no longer part Control Line Aerobatics strongly feel part events history future will have major impact levels competition couple points difference can mean place Nats can attest based experience what drove make decision Ive made about number-five Caudron what Im going share Old Number Five has greatflying airplane beginning also good-looking airplane picked up great deal hangar rash early year resulting rather poor showing appearance judging make some hard decisions Other mostly cosmetic problems model good shape could flown practice/backup handicap lower-than-normal points ready another Nats about time heard John Brodak going market line quality butyrate dope decision became much easier would strip refinish model test well new paint worked ready apply first coats clear raw wood elements decision refinish outlined preceding paragraph status model prognosis good refinish importantly real need make change few details aid decision-making process Probably important decide whether airplane good start can its undesirable characteristics corrected cant answer positively dont consider investing time just whatever repairs necessary keep flying next point overall prognosis heavily biased state airplane will have difficulty controlling fuel residue oil soaking its real judgment call Dont proceed unless can resolve problem because oil will bleed through finishes Other residual problems such slop controls structural cracks etc can easily worked refinish Cut structure fix repair everything remotely necessary decide refinish things still look favorable point press preparing airplane quality redo few exceptions Aerobatics models finished butyrate nitrates acrylic lacquers other finishes epoxies multipart auto finishes several methods remove paint substrate course process used combination dont recommend paint-stripper chemical because caustic nature material can get raw wood causing problems bleedthrough heat gun very effective breaking wood substrate bond however technique has its limitations wood has covered tissue fiberglass heat allows peel covering off large chunks leaving raw wood requires light sanding havent mentioned widely popular carbon veil covering woven although exceptionally strong does respond well heat techniques will hold together allow peel away anything small pieces makes process tedious next process us have used soak paper towels thinner wipe off dope get down covering Editors note sure well-ventilated area However theres new wrinkle get carbon wipes away thinner first used method astonished easy nature carbon veil naturally contributes big benefit process wood very clean free dents Surprisingly canopy area can cleaned easily filleting left undisturbed point should admiring basically naked airplane Patience prerequisite job well try rush cut corners will get dings surfaces will have repair later next point fillets its best redo after work recovering common fillet material Epoxolite filler Sometimes will come off removing tissue often will have focus fillets Apply heat fillets soften material pick epoxy after remove heat Theres point adhesion will break epoxy too soft wait until epoxy gets stiff enough pick off knife might go quickly keep periodically heating picking Before long will get feel get fillets up After have finished removing apply some CyA harden general area around wing tail joints Other filleting techniques balsa lightweight spackling compound CyA can cut balsa fillets out /2 3/4 shape required providing durable fillet can save stripping thinners producing like-new condition other methods will probably need several applications nitromethane commercial debonder either case likelihood problems chemicals weakening reason dont recommend latter two techniques come full circle start internal repair work such control bearings etc after model stripped Plan repair mechanical cosmetic matters mind Just dont hesitate cut big enough hole first time Thats start refinishing complete rehab has definite place scheme things caveat option should considered sound good airplane will result efforts consider can have essentially fresh competitive airplane finish time thats big plus developing stable Time get going Model Aviation
Edition: Model Aviation - 1999/01
Page Numbers: 135, 136
Edition: Model Aviation - 1999/01
Page Numbers: 135, 136
CONTROL LINE AEROBATICS S Nationals Nats still fresh thought would comment some technical points competition didnt have space last months coverage some interesting approaches getting same high performance higher placings performance level has raised various packages display exceptional drive very light air conditions pilots able hit extremely hard corners still have consistent precise bottoms demands moderate-to-light models ton horsepower under control would characterize power package year maturing newer engines such Precision Aeros have used several years running betterif thats possiblebecause pilots higher up learning curve top fliers use venerable ST 60 such Windy Urtnowski Bob Baron Bill Saurez achieving excellent results through continued fine-tuning propellers fuel problem older engines keeping running since have r out production years conditions years Nats significantly different 1997 Most fliers realizing power before looking control power saw charging Out January1999 135 Bob McDonalds signature design Unlimited P-47 superb flier molded parts PA 61 pipe w - Gerald Clarks 40-year-old Sportster carries Ken BarbieTM K&B 45 flies well Looks like early full-scale Vega Jack Sunderland Classic Stunter Design aerobatic team colors Windy Urtnowskis Cardinal upcoming Brodak kit Based SOs Hawker Hunter British fighter Brodak Fly-in successful mid-sized model profile transition competition corners various combinations reduced compression propeller diameter/pitch pipe length changes reduction nitromethane used After competition finished few fliers shared knowledge flying others models Friday evening has evolved fly-in features everyone benefits Several new airplanes drew attention years Nats Bob McDonalds exceptional Unlimited class racer constructed using tooling Bill Werwages semiscale P-47s Bobs model look what P-47 converted full-scale Unlimited racer would should model well-executed well-flown drew attention time air David Fitzgerald new Star Gazer Ted Fancher flew Final Edition both derivatives Teds design Davids newest reflected efforts tracking tail configurations exceptional 57 ounces very strong performer Ted done exceptional refinish latest using automotive two-part polyurethanes winding up front row modifications stabilizer sharper leading edge savings three ounces really showed great bottoms Well worth overall effort Tech Tips Unless until appearance points no longer part Control Line Aerobatics strongly feel part events history future will have major impact levels competition couple points difference can mean place Nats can attest based experience what drove make decision Ive made about number-five Caudron what Im going share Old Number Five has greatflying airplane beginning also good-looking airplane picked up great deal hangar rash early year resulting rather poor showing appearance judging make some hard decisions Other mostly cosmetic problems model good shape could flown practice/backup handicap lower-than-normal points ready another Nats about time heard John Brodak going market line quality butyrate dope decision became much easier would strip refinish model test well new paint worked ready apply first coats clear raw wood elements decision refinish outlined preceding paragraph status model prognosis good refinish importantly real need make change few details aid decision-making process Probably important decide whether airplane good start can its undesirable characteristics corrected cant answer positively dont consider investing time just whatever repairs necessary keep flying next point overall prognosis heavily biased state airplane will have difficulty controlling fuel residue oil soaking its real judgment call Dont proceed unless can resolve problem because oil will bleed through finishes Other residual problems such slop controls structural cracks etc can easily worked refinish Cut structure fix repair everything remotely necessary decide refinish things still look favorable point press preparing airplane quality redo few exceptions Aerobatics models finished butyrate nitrates acrylic lacquers other finishes epoxies multipart auto finishes several methods remove paint substrate course process used combination dont recommend paint-stripper chemical because caustic nature material can get raw wood causing problems bleedthrough heat gun very effective breaking wood substrate bond however technique has its limitations wood has covered tissue fiberglass heat allows peel covering off large chunks leaving raw wood requires light sanding havent mentioned widely popular carbon veil covering woven although exceptionally strong does respond well heat techniques will hold together allow peel away anything small pieces makes process tedious next process us have used soak paper towels thinner wipe off dope get down covering Editors note sure well-ventilated area However theres new wrinkle get carbon wipes away thinner first used method astonished easy nature carbon veil naturally contributes big benefit process wood very clean free dents Surprisingly canopy area can cleaned easily filleting left undisturbed point should admiring basically naked airplane Patience prerequisite job well try rush cut corners will get dings surfaces will have repair later next point fillets its best redo after work recovering common fillet material Epoxolite filler Sometimes will come off removing tissue often will have focus fillets Apply heat fillets soften material pick epoxy after remove heat Theres point adhesion will break epoxy too soft wait until epoxy gets stiff enough pick off knife might go quickly keep periodically heating picking Before long will get feel get fillets up After have finished removing apply some CyA harden general area around wing tail joints Other filleting techniques balsa lightweight spackling compound CyA can cut balsa fillets out /2 3/4 shape required providing durable fillet can save stripping thinners producing like-new condition other methods will probably need several applications nitromethane commercial debonder either case likelihood problems chemicals weakening reason dont recommend latter two techniques come full circle start internal repair work such control bearings etc after model stripped Plan repair mechanical cosmetic matters mind Just dont hesitate cut big enough hole first time Thats start refinishing complete rehab has definite place scheme things caveat option should considered sound good airplane will result efforts consider can have essentially fresh competitive airplane finish time thats big plus developing stable Time get going Model Aviation
