Witch IIawk 500 WANTING small hot-climbing job would have glide comparable larger ships Jim Clem designed 237 sq Witch Hawk 1978 Category II III work Since its contest record has phenomenal winning scores local regional meets Nationals 1979 same time winning contests little Witch Hawk setting national records hands Bill Jenkins received NFFS Top Ten Design recognition Jim 1981 Operating under precept little good must better Jim scaled up 237 sq model late 1979 Witch Hawk 500 presented precept proved accurate contest record bigger bird no less impressive Ranging first place 1980 Nats Bill Dunlop prestigious wins 1981 Tulsa Glue Dobbers Annual Meet Huntsville Heart Dixie Contest Bill Jenkins Witch Hawk 500 bird same feather its smaller nest mate Emphasizing time-honored Jim Clem suc cess formula best described simplicity action 500 builds quickly accurately modeler almost regardless previous build ing experience excellent first choice airplane anyone wanting break competition scene well potential Number ship experienced competitor Construction Probably best approach 66 Model Aviation Witch Hawk 500 looks like gliding landing isnt dethermalized isnttoooften Thisone belongsto Bill Jenkins Memphis TN Notethatenkins prefersa single-strut landing skid Dunlops has double-strut skid FULL-SIZE PLANS AVAILABLE. SEE PAGE 164 I-WIT I FUSELAGELITSIDE STOAT OMsOR3O ASREUtRO SURE PTEWIAWI MAT FOR WIWOR CA ELAGE TOP VIEW TTM TI TOFTIR TTI-OMIIR BOI-M SORRT 3/SO MUSK WIRE LA SOOTTOP WOO BOTTOM IM MI-MO3/00 SkI-SO 5010 RRWIIMROWIOMRMOLSA WIMOOOOJT 0501 MOM LTMOIMOTS IMO/TO0\t0\ITOTOOTOO WING P LAN LEFT SIDE IM-SO IROOBBO ROOST'7 1/ TO I/B MA MR RB M MOT IIAMIIOORI-OTKMTO TOTOJROAR PYLON TAnERN WITCH HAWK 500 IPOWEO BY 15 MAE think though kit instead being scratch-built translation way go pre-kit necessary components before starting construction phase fuselage pieces will need pre-cut sides top bottom pylon components plywood engine pieces interior formers critical pieces purposes align ment top bottom fuselage Since situtated inside fuselage sides dictate straight completed fuselage will Take special pains cut both pylon slot rudder slot accurately possible straight therell no assurance plane will fly should flying surfaces youll need pre-cut wing ribs stab ribs rudder Note rudder has spruce leading edge ward off hangar rash spars leading trailing edges stock sizes can pulled wood bin needed Now workbench littered bits pieces can start making some sense out covering plan Saran Wrap pinning down fuselage too over plan Install -in fuselage formers aid ofa small 900 triangle alignment guide sides next An aliphetic resin such Sig Bond useful type construciton because allows time make minor adjustments check alignment work go fuselage box completed adding bottom top since fuselage being built upside down Check pylon slot make sure formers have xcess glue might alter pylon incidence angle final assembly steps engine mount sandwich made layer 3/32 plywood 3/32 landing gear wire available NFFS Supplies 14 plywood engine mount pieces should epoxied together Fill area around gear wire scrap 3/32 balsa epoxy before installing assembly Note -in triangu lar balsa should inserted glued inside fuselage box Section AA additional gluing area prior epoxying engine mount position rudder should positioned carefully its slot glued place penetrates fuselage box depth -in fuselage top rudder must aligned perfectly pre dictable flight pattern occur plywood stab mount -in inci dence block complete basic fuselage struc ture glue pylon place time will installed last stage construction order may shifted locate CG properly Sand fuselage set aside until flying surfaces built main wing panels constructed flat building board Start pinning down ading edge strip both front rear bottom spars triangular trailing edge stock Install W-2 diagonal ribs omit W-1 ribs until dihedral installed Butt eading edge piece up against ribs glue tnem bottomleading edge 3/16 top spar can now cemented place omit turbulator spars until after W set panels joined tip panels require washout Prop up trailing edge tip rib juncture panels dry put dihedral blocking up panel required height epoxying leading trailing edges After dihedral joints locked place W- ls dihedral braces gussets turbulator spars can added Complete wing adding 3/16-in tips sand leading edge its final contour small template sheet alumi num can made assure accuracy sanding leading edge shape Sand rest wing carefully remove glue bumps fuzz set aside along fuselage stabilizer built identical wing except three center ribs should undercut after assembly accept 1/16 top sheeting template will also assistance final shaping leading edge contour After insetting split dowel pivot leading edge add 3/16-in tips sand structure did wing September 1982 67 03MRLMM / 7 STABILIZER VVflS lSDlII UUE1IOp5 oacK-iii WITCh riawk 500 shows off warp-resistant diagonal-ribbed wing stab good detail As FF models go simple buildflies great open structure can covered plastic heat-shrink films silkspan dope prefer Some modelers like double tissue covering works rather well sufficiently tough flying sites devoid stubble other puncture-producing ground clutter Assemble pylon wing mount upside down building board components previously cut out Use small 900 triangle ensure square place triangular support pieces spruce front back place Carefully drill holes 3/16 dowels useful technique sharpen end dowel slightly pencil sharpener easier insertion mounting holes Attach dethermalizer hooks other re maining hardware fuselage stabilizer using epoxy Perforating hardware location pin numerous times will allow epoxy grip wood tightly Nothing discon certing have DT hook pop off stab just before first flyoff flight major contest Finish fuselage either good fuelproof dope epoxy finishes Treat pylon/wing mount assembly same fashion will note some scrap filling will necessary fuselage top around pylon slot area after pylon epoxied place Save bit paint spot Mount timer engine pacifier tank stabilizer fuselage strap wing pylon Fit pylon its slot slide either backwards forwards until center gravity CG shown plans Bill Dunlop found necessary cut away small portion pylon order move wing far enough forward balance properly adding dead weight tail Epoxy pylon place its properly located close up finish area First flights should hand glides shoulder height Assuming CG correct adjust stab incidence block get flat penetrating glide right glide turn accomplished tilting right side stab upward yiewed rear approximately same height dihedral angle right main wing panel right glide turn should flat notmushy plane dives pack up incidence block 1/64-in time First powered flights should begin no 3-sec engine run full power Launch plane steep angle tilted slightly right right wing does want stay up warp -in washin main panel polyhedral breakeither steam plane covered silkspan tissue MonoKote iron plane covered plastic film Another way creating washin add small about 2-in piece trailing edge stock bottom right wing panel just inboard polyhedral break ship goes too hard right add bit left engine thrust add left rudder plane goes straight up left add very small 1/32-in right rudder tab reduce left thrust bit problem aware low-thrustline airplanes possibility plane going right keeping right wing up after adding washin Potential solutions 1 decrease right rudder tab 2 increase left thrust 3 decrease incidence latter solution should kept well mind Its amazing models will right themselves scramble altitude once excessive incidence removed trimmed correctly plane should make about complete rotation snap out top power pattern right glide turn engine cuts Because its short nose moment will transition well end ofa5sec engine run will end 7 sec Proven under contest conditions Witch Hawk 500 offers consistency winning flight potential time its launched 68 Model Aviation i-rant end ot Dunlops model snows ott tuel plumbing detail K&U engine K-Mart clockwork timerpacifier pressure fuel tank Stabilizer Dunlops model dethermalized mode uses remotely-located fuse actuationrear location shown plans Bonnie Jenkins helps husband Bill get ready last winning max flight Tulsa Glue Dobbers Annual Meet Witch Hawk 500s designer Jim Clem left gets ready check Dun lops engine run Especially flyoffs engine run must precise
Edition: Model Aviation - 1982/09
Page Numbers: 66, 67, 68
Witch IIawk 500 WANTING small hot-climbing job would have glide comparable larger ships Jim Clem designed 237 sq Witch Hawk 1978 Category II III work Since its contest record has phenomenal winning scores local regional meets Nationals 1979 same time winning contests little Witch Hawk setting national records hands Bill Jenkins received NFFS Top Ten Design recognition Jim 1981 Operating under precept little good must better Jim scaled up 237 sq model late 1979 Witch Hawk 500 presented precept proved accurate contest record bigger bird no less impressive Ranging first place 1980 Nats Bill Dunlop prestigious wins 1981 Tulsa Glue Dobbers Annual Meet Huntsville Heart Dixie Contest Bill Jenkins Witch Hawk 500 bird same feather its smaller nest mate Emphasizing time-honored Jim Clem suc cess formula best described simplicity action 500 builds quickly accurately modeler almost regardless previous build ing experience excellent first choice airplane anyone wanting break competition scene well potential Number ship experienced competitor Construction Probably best approach 66 Model Aviation Witch Hawk 500 looks like gliding landing isnt dethermalized isnttoooften Thisone belongsto Bill Jenkins Memphis TN Notethatenkins prefersa single-strut landing skid Dunlops has double-strut skid FULL-SIZE PLANS AVAILABLE. SEE PAGE 164 I-WIT I FUSELAGELITSIDE STOAT OMsOR3O ASREUtRO SURE PTEWIAWI MAT FOR WIWOR CA ELAGE TOP VIEW TTM TI TOFTIR TTI-OMIIR BOI-M SORRT 3/SO MUSK WIRE LA SOOTTOP WOO BOTTOM IM MI-MO3/00 SkI-SO 5010 RRWIIMROWIOMRMOLSA WIMOOOOJT 0501 MOM LTMOIMOTS IMO/TO0\t0\ITOTOOTOO WING P LAN LEFT SIDE IM-SO IROOBBO ROOST'7 1/ TO I/B MA MR RB M MOT IIAMIIOORI-OTKMTO TOTOJROAR PYLON TAnERN WITCH HAWK 500 IPOWEO BY 15 MAE think though kit instead being scratch-built translation way go pre-kit necessary components before starting construction phase fuselage pieces will need pre-cut sides top bottom pylon components plywood engine pieces interior formers critical pieces purposes align ment top bottom fuselage Since situtated inside fuselage sides dictate straight completed fuselage will Take special pains cut both pylon slot rudder slot accurately possible straight therell no assurance plane will fly should flying surfaces youll need pre-cut wing ribs stab ribs rudder Note rudder has spruce leading edge ward off hangar rash spars leading trailing edges stock sizes can pulled wood bin needed Now workbench littered bits pieces can start making some sense out covering plan Saran Wrap pinning down fuselage too over plan Install -in fuselage formers aid ofa small 900 triangle alignment guide sides next An aliphetic resin such Sig Bond useful type construciton because allows time make minor adjustments check alignment work go fuselage box completed adding bottom top since fuselage being built upside down Check pylon slot make sure formers have xcess glue might alter pylon incidence angle final assembly steps engine mount sandwich made layer 3/32 plywood 3/32 landing gear wire available NFFS Supplies 14 plywood engine mount pieces should epoxied together Fill area around gear wire scrap 3/32 balsa epoxy before installing assembly Note -in triangu lar balsa should inserted glued inside fuselage box Section AA additional gluing area prior epoxying engine mount position rudder should positioned carefully its slot glued place penetrates fuselage box depth -in fuselage top rudder must aligned perfectly pre dictable flight pattern occur plywood stab mount -in inci dence block complete basic fuselage struc ture glue pylon place time will installed last stage construction order may shifted locate CG properly Sand fuselage set aside until flying surfaces built main wing panels constructed flat building board Start pinning down ading edge strip both front rear bottom spars triangular trailing edge stock Install W-2 diagonal ribs omit W-1 ribs until dihedral installed Butt eading edge piece up against ribs glue tnem bottomleading edge 3/16 top spar can now cemented place omit turbulator spars until after W set panels joined tip panels require washout Prop up trailing edge tip rib juncture panels dry put dihedral blocking up panel required height epoxying leading trailing edges After dihedral joints locked place W- ls dihedral braces gussets turbulator spars can added Complete wing adding 3/16-in tips sand leading edge its final contour small template sheet alumi num can made assure accuracy sanding leading edge shape Sand rest wing carefully remove glue bumps fuzz set aside along fuselage stabilizer built identical wing except three center ribs should undercut after assembly accept 1/16 top sheeting template will also assistance final shaping leading edge contour After insetting split dowel pivot leading edge add 3/16-in tips sand structure did wing September 1982 67 03MRLMM / 7 STABILIZER VVflS lSDlII UUE1IOp5 oacK-iii WITCh riawk 500 shows off warp-resistant diagonal-ribbed wing stab good detail As FF models go simple buildflies great open structure can covered plastic heat-shrink films silkspan dope prefer Some modelers like double tissue covering works rather well sufficiently tough flying sites devoid stubble other puncture-producing ground clutter Assemble pylon wing mount upside down building board components previously cut out Use small 900 triangle ensure square place triangular support pieces spruce front back place Carefully drill holes 3/16 dowels useful technique sharpen end dowel slightly pencil sharpener easier insertion mounting holes Attach dethermalizer hooks other re maining hardware fuselage stabilizer using epoxy Perforating hardware location pin numerous times will allow epoxy grip wood tightly Nothing discon certing have DT hook pop off stab just before first flyoff flight major contest Finish fuselage either good fuelproof dope epoxy finishes Treat pylon/wing mount assembly same fashion will note some scrap filling will necessary fuselage top around pylon slot area after pylon epoxied place Save bit paint spot Mount timer engine pacifier tank stabilizer fuselage strap wing pylon Fit pylon its slot slide either backwards forwards until center gravity CG shown plans Bill Dunlop found necessary cut away small portion pylon order move wing far enough forward balance properly adding dead weight tail Epoxy pylon place its properly located close up finish area First flights should hand glides shoulder height Assuming CG correct adjust stab incidence block get flat penetrating glide right glide turn accomplished tilting right side stab upward yiewed rear approximately same height dihedral angle right main wing panel right glide turn should flat notmushy plane dives pack up incidence block 1/64-in time First powered flights should begin no 3-sec engine run full power Launch plane steep angle tilted slightly right right wing does want stay up warp -in washin main panel polyhedral breakeither steam plane covered silkspan tissue MonoKote iron plane covered plastic film Another way creating washin add small about 2-in piece trailing edge stock bottom right wing panel just inboard polyhedral break ship goes too hard right add bit left engine thrust add left rudder plane goes straight up left add very small 1/32-in right rudder tab reduce left thrust bit problem aware low-thrustline airplanes possibility plane going right keeping right wing up after adding washin Potential solutions 1 decrease right rudder tab 2 increase left thrust 3 decrease incidence latter solution should kept well mind Its amazing models will right themselves scramble altitude once excessive incidence removed trimmed correctly plane should make about complete rotation snap out top power pattern right glide turn engine cuts Because its short nose moment will transition well end ofa5sec engine run will end 7 sec Proven under contest conditions Witch Hawk 500 offers consistency winning flight potential time its launched 68 Model Aviation i-rant end ot Dunlops model snows ott tuel plumbing detail K&U engine K-Mart clockwork timerpacifier pressure fuel tank Stabilizer Dunlops model dethermalized mode uses remotely-located fuse actuationrear location shown plans Bonnie Jenkins helps husband Bill get ready last winning max flight Tulsa Glue Dobbers Annual Meet Witch Hawk 500s designer Jim Clem left gets ready check Dun lops engine run Especially flyoffs engine run must precise
Edition: Model Aviation - 1982/09
Page Numbers: 66, 67, 68
Witch IIawk 500 WANTING small hot-climbing job would have glide comparable larger ships Jim Clem designed 237 sq Witch Hawk 1978 Category II III work Since its contest record has phenomenal winning scores local regional meets Nationals 1979 same time winning contests little Witch Hawk setting national records hands Bill Jenkins received NFFS Top Ten Design recognition Jim 1981 Operating under precept little good must better Jim scaled up 237 sq model late 1979 Witch Hawk 500 presented precept proved accurate contest record bigger bird no less impressive Ranging first place 1980 Nats Bill Dunlop prestigious wins 1981 Tulsa Glue Dobbers Annual Meet Huntsville Heart Dixie Contest Bill Jenkins Witch Hawk 500 bird same feather its smaller nest mate Emphasizing time-honored Jim Clem suc cess formula best described simplicity action 500 builds quickly accurately modeler almost regardless previous build ing experience excellent first choice airplane anyone wanting break competition scene well potential Number ship experienced competitor Construction Probably best approach 66 Model Aviation Witch Hawk 500 looks like gliding landing isnt dethermalized isnttoooften Thisone belongsto Bill Jenkins Memphis TN Notethatenkins prefersa single-strut landing skid Dunlops has double-strut skid FULL-SIZE PLANS AVAILABLE. SEE PAGE 164 I-WIT I FUSELAGELITSIDE STOAT OMsOR3O ASREUtRO SURE PTEWIAWI MAT FOR WIWOR CA ELAGE TOP VIEW TTM TI TOFTIR TTI-OMIIR BOI-M SORRT 3/SO MUSK WIRE LA SOOTTOP WOO BOTTOM IM MI-MO3/00 SkI-SO 5010 RRWIIMROWIOMRMOLSA WIMOOOOJT 0501 MOM LTMOIMOTS IMO/TO0\t0\ITOTOOTOO WING P LAN LEFT SIDE IM-SO IROOBBO ROOST'7 1/ TO I/B MA MR RB M MOT IIAMIIOORI-OTKMTO TOTOJROAR PYLON TAnERN WITCH HAWK 500 IPOWEO BY 15 MAE think though kit instead being scratch-built translation way go pre-kit necessary components before starting construction phase fuselage pieces will need pre-cut sides top bottom pylon components plywood engine pieces interior formers critical pieces purposes align ment top bottom fuselage Since situtated inside fuselage sides dictate straight completed fuselage will Take special pains cut both pylon slot rudder slot accurately possible straight therell no assurance plane will fly should flying surfaces youll need pre-cut wing ribs stab ribs rudder Note rudder has spruce leading edge ward off hangar rash spars leading trailing edges stock sizes can pulled wood bin needed Now workbench littered bits pieces can start making some sense out covering plan Saran Wrap pinning down fuselage too over plan Install -in fuselage formers aid ofa small 900 triangle alignment guide sides next An aliphetic resin such Sig Bond useful type construciton because allows time make minor adjustments check alignment work go fuselage box completed adding bottom top since fuselage being built upside down Check pylon slot make sure formers have xcess glue might alter pylon incidence angle final assembly steps engine mount sandwich made layer 3/32 plywood 3/32 landing gear wire available NFFS Supplies 14 plywood engine mount pieces should epoxied together Fill area around gear wire scrap 3/32 balsa epoxy before installing assembly Note -in triangu lar balsa should inserted glued inside fuselage box Section AA additional gluing area prior epoxying engine mount position rudder should positioned carefully its slot glued place penetrates fuselage box depth -in fuselage top rudder must aligned perfectly pre dictable flight pattern occur plywood stab mount -in inci dence block complete basic fuselage struc ture glue pylon place time will installed last stage construction order may shifted locate CG properly Sand fuselage set aside until flying surfaces built main wing panels constructed flat building board Start pinning down ading edge strip both front rear bottom spars triangular trailing edge stock Install W-2 diagonal ribs omit W-1 ribs until dihedral installed Butt eading edge piece up against ribs glue tnem bottomleading edge 3/16 top spar can now cemented place omit turbulator spars until after W set panels joined tip panels require washout Prop up trailing edge tip rib juncture panels dry put dihedral blocking up panel required height epoxying leading trailing edges After dihedral joints locked place W- ls dihedral braces gussets turbulator spars can added Complete wing adding 3/16-in tips sand leading edge its final contour small template sheet alumi num can made assure accuracy sanding leading edge shape Sand rest wing carefully remove glue bumps fuzz set aside along fuselage stabilizer built identical wing except three center ribs should undercut after assembly accept 1/16 top sheeting template will also assistance final shaping leading edge contour After insetting split dowel pivot leading edge add 3/16-in tips sand structure did wing September 1982 67 03MRLMM / 7 STABILIZER VVflS lSDlII UUE1IOp5 oacK-iii WITCh riawk 500 shows off warp-resistant diagonal-ribbed wing stab good detail As FF models go simple buildflies great open structure can covered plastic heat-shrink films silkspan dope prefer Some modelers like double tissue covering works rather well sufficiently tough flying sites devoid stubble other puncture-producing ground clutter Assemble pylon wing mount upside down building board components previously cut out Use small 900 triangle ensure square place triangular support pieces spruce front back place Carefully drill holes 3/16 dowels useful technique sharpen end dowel slightly pencil sharpener easier insertion mounting holes Attach dethermalizer hooks other re maining hardware fuselage stabilizer using epoxy Perforating hardware location pin numerous times will allow epoxy grip wood tightly Nothing discon certing have DT hook pop off stab just before first flyoff flight major contest Finish fuselage either good fuelproof dope epoxy finishes Treat pylon/wing mount assembly same fashion will note some scrap filling will necessary fuselage top around pylon slot area after pylon epoxied place Save bit paint spot Mount timer engine pacifier tank stabilizer fuselage strap wing pylon Fit pylon its slot slide either backwards forwards until center gravity CG shown plans Bill Dunlop found necessary cut away small portion pylon order move wing far enough forward balance properly adding dead weight tail Epoxy pylon place its properly located close up finish area First flights should hand glides shoulder height Assuming CG correct adjust stab incidence block get flat penetrating glide right glide turn accomplished tilting right side stab upward yiewed rear approximately same height dihedral angle right main wing panel right glide turn should flat notmushy plane dives pack up incidence block 1/64-in time First powered flights should begin no 3-sec engine run full power Launch plane steep angle tilted slightly right right wing does want stay up warp -in washin main panel polyhedral breakeither steam plane covered silkspan tissue MonoKote iron plane covered plastic film Another way creating washin add small about 2-in piece trailing edge stock bottom right wing panel just inboard polyhedral break ship goes too hard right add bit left engine thrust add left rudder plane goes straight up left add very small 1/32-in right rudder tab reduce left thrust bit problem aware low-thrustline airplanes possibility plane going right keeping right wing up after adding washin Potential solutions 1 decrease right rudder tab 2 increase left thrust 3 decrease incidence latter solution should kept well mind Its amazing models will right themselves scramble altitude once excessive incidence removed trimmed correctly plane should make about complete rotation snap out top power pattern right glide turn engine cuts Because its short nose moment will transition well end ofa5sec engine run will end 7 sec Proven under contest conditions Witch Hawk 500 offers consistency winning flight potential time its launched 68 Model Aviation i-rant end ot Dunlops model snows ott tuel plumbing detail K&U engine K-Mart clockwork timerpacifier pressure fuel tank Stabilizer Dunlops model dethermalized mode uses remotely-located fuse actuationrear location shown plans Bonnie Jenkins helps husband Bill get ready last winning max flight Tulsa Glue Dobbers Annual Meet Witch Hawk 500s designer Jim Clem left gets ready check Dun lops engine run Especially flyoffs engine run must precise