HAVE YOU NOTICED biplane fliers tend also glider fliers nd glider fliers tend also fly biplanes seem worlds apart yet biplanes gliders have something common ro mantic subjects objects beauty air prettiest modern biplanes popular homebuilt Hatz Biplane John Hatz designed Biplane over 16 flying doghouse Unlike popular biplane designs Hatz no speed burner feel biplane looks best flying significantly slower Loops hammerheads should big lazy landings should down glider speed lot wing area high-lift airfoil combined short tail moment distinguishes other bipes club field Having rudder half cowl big built-in muffler Tatone manifold ducts exhaust through /4-in plywood engine mount muffler nose may assembled soon formers cabane struts place Cut out noseblock Fl jigsaw Using sideview mark Fl meets fuselage sides put aside temporarily block forms upper left portion cowl requires years ago drawing plans Hatz has compared Cub two wings open cockpits Dudley Kelly architect former layout engi neer Convair drew plans made available public Mr Kelley will send three-view color photo full-size Hatz $300 address Dudley Kelly Route 4 Ver sailles KY 40383 Like its full-size brother model Hatz simple rugged Yet performs aerobatic maneuvers well enough solo act Blue Eagles air show dem onstration team Air show flying requires ability put good show under difficult field weather conditions Hatz does well sometimes play ing role dreaded Red Baron aerial duel Snoopy famous close prop makes rudder very care making Cut rectangular balsa block length equal distance between Fl F2 width little greater fuselage width Cut block length wise along thrust line left half will cowl block right half will hatch Note left half wider right half Using side view again mark 1/4 x /4 hardwood engine bearer inserted block Cut / X /2 groove block shown side view Section A router table saw perfect tool X-acto blade carving knife will Bevel / X /4 engine bearer slightly shown plans insert X bearer /4 X ve glue either white glue epoxy depending well routed groove Cut 16 Model Aviation effectivespins work time turns flat hammerheads never fail short tail moment requires care ground Landings should well flared full up elevator required low speed taxis especially rough fields Hatz rugged will survive roughest flip-overs have passed beginner stage RC flying like looks bipe ready build Hatz Biplane Construction Conventional construction used plane explained plans However few details bit different will mentioned left notches cowl block hatch block clear cabane struts Hollow side cowl block time hatch block can hollowed later Using side view once again cut bottom nose block glue lower engine bearer place Mark position engine bearers F2 position hatch block cowl block bottom block nose block fuselage see everything fits together blocks fit gether tightly glue blocks place hatch block must lightly tack-glued may released later Complete sheeting top mount opening behind engine un der engine exits noseblock drop Hot Stuff will stiffen steel wool after place Epoxy wire hook bottom hatch another wire hook inside bottom cowl /8 X /s balsa strip hatch another strip mo tor mount guides align hatch rubberband two hooks holds hatch place Secure engine engine mount blind nuts Attach engine mount hardwood bearers screws Dont glue place might want to make interplane struts slip loosely slots wings struts transfer rolling loads between wings tended break away crash Hatz Biplane will fit inside compact cars removing wings wish add scale bracing wires shown plans Fur thermore proportions scale can move up AMA scale adding details see Sport vialion March 1976 excellent article fullsize Hatz David P Andersen fuselage carve entire nose shape An X-acto razor plane good tool Mark outline engine clear ance opening fuselage break hatch block loose Cut engine clearance opening fuselage side hatch block Install iangular stock reinforcements inside nose four places indicated cross-section view seal muffler compartment protect tank exhaust make tin foil form around tank epoxy form engine mount dry coat foil generously two coats sili cone rubber trim make flush fit against F2 tank should fit tightly tank hole F2 prevent oil getting radio compartment seal muffler stuff fine steel wool motor remove later repairs muffler very effective So quiet fact can hear swish pro peller blades cutting through air muffler reduces sharp crack en gine low-pitched thump makes plane sound like prototype perhaps stand-off scale contests should give points scale sounds well quiet engine takes some getting used Its harder adjust needle valve cans t hear plane air other ships flying pre fer usual engine mount conventional upright engine installation also included plans cabane struts h maple plywood structure direct evolution Wayfarer Hobo biplane designs very rugged easy Flying Start engine taxi away pit area its bumpy field hold full up elevator keep tailwheel firmly ground Now turn wind stop Adjust cap wipe oil off hands check wind ready advance throttle still holding full up elevator Steer rudder gradually ease off elevator plane accelerates Just let lift off itself pick up speed shallow climb Get feel controls test trim set tings making pass over field Turn around sharply banking ailerons pulling back stick tighten turn Level off touch opposite aileron pass field again over center field pull stick about August1977 17 halfway back go up loop Back level off off throttle down side loop Continue release up elevator bottom throttle First hammerhead full pull sharply back stick return neutral elevator nose reaches vertical plane should go straight up slowing gradually Just before stops push full left rudder chop throttle Hatz will rotate 1800 point straight down Neutralize rud der hold little up elevator Pull out dive little up elevator leveling wings aileron control Now three rolls Starting level flight push full left aileron Push just nudge down elevator rolls inverted nudge up elevator rolls up right down again inverted etc being little early elevator nudges plane will turn right rolling ing little late will cause turn left Now lets climb altitude prepara tion spin During Blue Eagles air shows Red Baron flying Hatz gets shot down Snoopy nouncer says Red Baron has hit plane must spin indeed always has Heres its done First throttle back idle Slowly pull back elevator slow down crawl pull full up elevator As plane stalls push full left rudder hold full up full left ailerons neutral true spin wings fully stalled 837 sq stalled wing area creates lot drag Holding full rudder elevator through out spin plane will rotate rapidly will come down slowly stop spin neutralize controls plane will stop rotating transition vertical dive Pull up gently resume level flight Most other maneuvers variations combinations maneuvers just described first landing need get feel planes glide slope making couple simulated landing approaches Throttle back idle approach field straight wind too high rock wings aileron spill excess lift too low apply little throttle Dont stretch glide up elevator use throttle instead Youll have better control speed kept up Try few low slow passes over field before final touch down plane about ten feet above field start flare out Feed up elevator gradually too quickly youll stall Try make tail wheel touch ground first Just before touchdown occurs pull full up elevator will hold tail wheel down prevent bouncing Hatz Biplanes flat-bottom airfoil high-lift airfoil stalls rather high angle attack permits very slow flight allows very pretty landings After rolling stop underscore triumphant flight slow dignified taxi back field box shut off motor radio throttle trim lever References ISponAvjarion March 1976 2 Dudley Kelly Route 4 versailles K 40383 Send $300 3-view color photo 3 Hatz Airplane Shop Route 2 Gleason wt 54435 4 The wooden Muffler Rod Mark Smith RC Modeler Jane 1974 18 Model Aviation Plywood cabane atruta strong simple engine exhaust built-in muffler cornea out bottom keep fuselage clean Music wire landing gear strapped place Authors old faithful Enya 45so terma itfits well within contours aircraft Tatone manifold ducts exhaust built-in muffler sound really muffled Hatz Seven Zero Easy Cleared takeoff model performa aerobatic maneuvers well enough solo act Blue Eagles air show demonstration team Air show flying requires ability put good show under difficult field weather conditions SOFT /4FtTBOOO ORIE1ChAM PLATFORMGOLDBERG HORNBM S OL1O1fX WlTHz\RORTAtEBOR P4TEBCE8BEC LAIN FROM ISBW 1181 INFLYNOOO LL I VB81ET AT T LL B TAP L4 00 AFTER FITTRG CABABE A4WREQ~ BCENTER AIIEETL~ILPMODAl BAA IARSI81ETZEBO ORFO m BOTTOM ROPINED TE 3lBAIAlETTF NARO r 4 TAEOL FORM KBE 2At\S H TOPBBOTTOMI IKNY1ORICdAIBEIICOCSIMTRIANBLELmilI -5TWA SAKW&COLORPHOTOLIWAlLET BELLY NMIFPS BATTERYBFR YPORTAlAATQNOJT1M50 WAD PER10011AlSEETSIR THROW ABIPLANE 0BINDS TIM MWFLER___TflCtO P04 OWIL hUMORS BY BAY IARIORT ENBBIE BOLIRTDSIWED B DRAWN BY DAVID 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