FREE FLIGHT DURATION LAST MONTH WE DISCUSSED some basics building two-piece wings time well look some variations Straight wing wires lot simpler make install bent ones what dont want wing flat center panels Well wing thick enough can angle tubes slightly give some dihedral mains Usually tubes located tight against top lower spar wing center against bottom upper spar few inches out easiest way to make main spar separate full-depth subassembly hardwood carbon-fiber top bottoms spars balsa filler between Make both main spars trim length Bevel ends desired dihedral Pin spars down flat surface fronts spars down centers about apart outer ends should desired dihedral Next cut single aluminum tube length should about longer total length wing wire minus width pylon Position over spar mark its location Carefully cut away balsa web until can fit wing tube place should flush back spar level building board Epoxy place After dries saw through exposed section aluminum tube remove finished spars simplest method have found build aluminum wing tubes flat center section model always results accurate two-piece wing what enough depth wing use straight wing wire biggest problem bent wires installing model shallow bends best trick Ive seen Frank Parmenter showed years ago adds piece brass tubing center section wing wire part will go through pylon bends wing wire up both ends just past brass tubing uses piece brass tubing pylon same inside diameter outside diameter tubing wing wire gives just enough clearance insert wing wire pylon need bend wires say dihedral model best system Ive seen Jim Wilson used Simple Toy Nordic gliders builds bent wing wires gluing firmly fuselage slices off top inch fuselage part wing wires Two nylon bolts used reattach piece Besides allowing wing wires removed easy storage also provides some give case crash Plans Simple Toy still available Model Aviation totally different approach make three-piece wing flat slightly dihedraled center section removable tips Lothar Doring Reiner Hofsass used method Espada solid-wing Wakefields successful 1980s one-piece center panel rubber-banded pylon usual manner tip removable held place small-diameter wire high point clever clip trailing edge variation used several Dutch glider fliers breaks wing few inches inboard dihedral break one-piece center section bolted top fuselage Total weight three-piece system probably comes out little less two-piece wing since outboard wing wires can considerably smaller certainly can result very compact model box need some way hold two wing halves together Slipping off wing wires flight could disastrous common method use small rubber band #8 will running hooks wing half can use single band near main wing wire twoone leading edge other trailing edge 114 Model Aviation l rubber band helps hold two wing halves fuselage Jody Millers FlA glider Nylon screws run through tab mounted top F1H pylon Allard van Wallenes foam-wing FlAs have three-piece wing blind mounting nuts wing trailing edge construction One-piece center panel attaches nylon bolts Another approach use plywood aluminum tab fuselage near wing trailing edge Nylon screws run through wing hold trailing edge place can position tab either above wing blind mounting nuts wing locate tab below wing run screws through wing nuts threaded holes tab Youll also need rubber band leading edge best thing about system allows easy adjustment wings differential warps adding shims between tab wing side other two-piece wing will require some beefing-up withstand concentrated loads ends wing wire center ribs traditional stick-and-tissue construction usually involves making first three four ribs out plywood instead balsa holes accurately drilled aluminum tubes also like face root wing plywood rib cut full airfoil size notches spars leading edge trailing edge composite constniction tube wing wire between top bottom spar needed wrapping Kevlar thread hold together wide balsa root rib capped carbon maintains airfoil shape FAI Model Supply about long can remember FAI Supply has source rubber other related hardware owner Ed Dolby has worked long hard give us rubber returns higher higher energy Thirty years ago 2000 foot-pounds per pound considered good stuff Now seeing double specific energy would safe say Eds Tan II rubber has done improve performance todays Wakefields other thing Perhaps has helped too much rumors abound rules changes reduce allowable rubber weight 40 grams 30 Along way Ed has come up some other staples workshop such Zona Saw FAI Supply catalog has also source kits parts cant find average hobby shop After almost 30 years business Ed decided time retire new owner longtime friend Eds John Clapp John wife Sally will operating FAI Supply hometown Sayre Pennsylvania addition keeping us supplied better better rubber John plans expand catalog offerings copy new catalog send $2 stamped selfaddressed envelope FAI Model Supply Box 366 Sayre PA 18840-0366 Tel/fax717 882-9873 Dirty 30 Longtime designer writer Dave Linstrum sent along photo Dirty 30 rubber model uses simple wing construction developed 30 years ago E Jedelsky front third wing carved hand-launch glider style /s sheet rest wing /20 sheet curved slightly over A6 ribs wing covered results very thin highly cambered wing can withstand lot abuse fuselage rolled balsa tube Tyvek FedEx envelope spiral-wrapped outside Although extra weight all-balsa construction might keep being competitive P-30 certainly would good beginners model Easy Wakefield Wing After building half-dozen carbon-fiber wings Wakefields decided try easy some might say lazy way wrote check Starline International few weeks later received finished wing ready cover No vacuum bagging no carbon dust over workshop no work wing built Ukranian husband wife least good can domaybe better features D-box formed single thickness woven carbon cloth carbon-fiber spars trailing edge 1mm balsa ribs spaced 10mm apart D-box 30mm apart aft spar ribs capped carbon spar wrapped aramid thread way out tip root rib 1 mm carbon As best can tell epoxy resin used exclusively assembly Best finished uncovered weight just under 42 grams Covered Starlines Polyspan all-up weight should around 52-54g Total span two-piece wing about 16 meters 63 inches projected area 1618 sq din cant quite place airfoil bit thinner slightly cambered typical Ukranian-Russian Wakes Thickness root 56mm chord 1135mm break numbers 515 100 tip its 35 785 Glide should excellent price $160 plus shipping Starline International 6146 E Cactus Wren Rd Scottsdale AZ 85253 Tel 948-5798 might want give owner Sal Fruciano call first doublecheck availability h1996 115 P-30 by Dave Linstrum uses Jedeisky wing construction Might good beginners project can find light wood Ready-to-cover 63-inch-span FiB wing Starline International features carbon-fiber D-box spars ribs
Edition: Model Aviation - 1996/03
Page Numbers: 114, 115
Edition: Model Aviation - 1996/03
Page Numbers: 114, 115
FREE FLIGHT DURATION LAST MONTH WE DISCUSSED some basics building two-piece wings time well look some variations Straight wing wires lot simpler make install bent ones what dont want wing flat center panels Well wing thick enough can angle tubes slightly give some dihedral mains Usually tubes located tight against top lower spar wing center against bottom upper spar few inches out easiest way to make main spar separate full-depth subassembly hardwood carbon-fiber top bottoms spars balsa filler between Make both main spars trim length Bevel ends desired dihedral Pin spars down flat surface fronts spars down centers about apart outer ends should desired dihedral Next cut single aluminum tube length should about longer total length wing wire minus width pylon Position over spar mark its location Carefully cut away balsa web until can fit wing tube place should flush back spar level building board Epoxy place After dries saw through exposed section aluminum tube remove finished spars simplest method have found build aluminum wing tubes flat center section model always results accurate two-piece wing what enough depth wing use straight wing wire biggest problem bent wires installing model shallow bends best trick Ive seen Frank Parmenter showed years ago adds piece brass tubing center section wing wire part will go through pylon bends wing wire up both ends just past brass tubing uses piece brass tubing pylon same inside diameter outside diameter tubing wing wire gives just enough clearance insert wing wire pylon need bend wires say dihedral model best system Ive seen Jim Wilson used Simple Toy Nordic gliders builds bent wing wires gluing firmly fuselage slices off top inch fuselage part wing wires Two nylon bolts used reattach piece Besides allowing wing wires removed easy storage also provides some give case crash Plans Simple Toy still available Model Aviation totally different approach make three-piece wing flat slightly dihedraled center section removable tips Lothar Doring Reiner Hofsass used method Espada solid-wing Wakefields successful 1980s one-piece center panel rubber-banded pylon usual manner tip removable held place small-diameter wire high point clever clip trailing edge variation used several Dutch glider fliers breaks wing few inches inboard dihedral break one-piece center section bolted top fuselage Total weight three-piece system probably comes out little less two-piece wing since outboard wing wires can considerably smaller certainly can result very compact model box need some way hold two wing halves together Slipping off wing wires flight could disastrous common method use small rubber band #8 will running hooks wing half can use single band near main wing wire twoone leading edge other trailing edge 114 Model Aviation l rubber band helps hold two wing halves fuselage Jody Millers FlA glider Nylon screws run through tab mounted top F1H pylon Allard van Wallenes foam-wing FlAs have three-piece wing blind mounting nuts wing trailing edge construction One-piece center panel attaches nylon bolts Another approach use plywood aluminum tab fuselage near wing trailing edge Nylon screws run through wing hold trailing edge place can position tab either above wing blind mounting nuts wing locate tab below wing run screws through wing nuts threaded holes tab Youll also need rubber band leading edge best thing about system allows easy adjustment wings differential warps adding shims between tab wing side other two-piece wing will require some beefing-up withstand concentrated loads ends wing wire center ribs traditional stick-and-tissue construction usually involves making first three four ribs out plywood instead balsa holes accurately drilled aluminum tubes also like face root wing plywood rib cut full airfoil size notches spars leading edge trailing edge composite constniction tube wing wire between top bottom spar needed wrapping Kevlar thread hold together wide balsa root rib capped carbon maintains airfoil shape FAI Model Supply about long can remember FAI Supply has source rubber other related hardware owner Ed Dolby has worked long hard give us rubber returns higher higher energy Thirty years ago 2000 foot-pounds per pound considered good stuff Now seeing double specific energy would safe say Eds Tan II rubber has done improve performance todays Wakefields other thing Perhaps has helped too much rumors abound rules changes reduce allowable rubber weight 40 grams 30 Along way Ed has come up some other staples workshop such Zona Saw FAI Supply catalog has also source kits parts cant find average hobby shop After almost 30 years business Ed decided time retire new owner longtime friend Eds John Clapp John wife Sally will operating FAI Supply hometown Sayre Pennsylvania addition keeping us supplied better better rubber John plans expand catalog offerings copy new catalog send $2 stamped selfaddressed envelope FAI Model Supply Box 366 Sayre PA 18840-0366 Tel/fax717 882-9873 Dirty 30 Longtime designer writer Dave Linstrum sent along photo Dirty 30 rubber model uses simple wing construction developed 30 years ago E Jedelsky front third wing carved hand-launch glider style /s sheet rest wing /20 sheet curved slightly over A6 ribs wing covered results very thin highly cambered wing can withstand lot abuse fuselage rolled balsa tube Tyvek FedEx envelope spiral-wrapped outside Although extra weight all-balsa construction might keep being competitive P-30 certainly would good beginners model Easy Wakefield Wing After building half-dozen carbon-fiber wings Wakefields decided try easy some might say lazy way wrote check Starline International few weeks later received finished wing ready cover No vacuum bagging no carbon dust over workshop no work wing built Ukranian husband wife least good can domaybe better features D-box formed single thickness woven carbon cloth carbon-fiber spars trailing edge 1mm balsa ribs spaced 10mm apart D-box 30mm apart aft spar ribs capped carbon spar wrapped aramid thread way out tip root rib 1 mm carbon As best can tell epoxy resin used exclusively assembly Best finished uncovered weight just under 42 grams Covered Starlines Polyspan all-up weight should around 52-54g Total span two-piece wing about 16 meters 63 inches projected area 1618 sq din cant quite place airfoil bit thinner slightly cambered typical Ukranian-Russian Wakes Thickness root 56mm chord 1135mm break numbers 515 100 tip its 35 785 Glide should excellent price $160 plus shipping Starline International 6146 E Cactus Wren Rd Scottsdale AZ 85253 Tel 948-5798 might want give owner Sal Fruciano call first doublecheck availability h1996 115 P-30 by Dave Linstrum uses Jedeisky wing construction Might good beginners project can find light wood Ready-to-cover 63-inch-span FiB wing Starline International features carbon-fiber D-box spars ribs
