Foiling around Computer U David Garwood PC-generated rib patterns save time frustration say youd scratch-building demon knew easy way make accurate wing rib patterns youd try new airfoil foam could easily make accurate cutting templates maybe youd repair elliptical-tip sailplane wing didnt have calculate five rib lengths draw graph paper Computer technology can help builders make balsa wing ribs plywood templates eliminates tedious handplotting airfoils graph paper well calculating rib length spacing distances tapered wing sections can computer airfoil plotting program make patterns traditional built-up construction wing ribs same technology will also help template-makers cut foam wing cores project used FOILED AGAIN! PC program published Cygnet Software 3525 Del Mar Heights Road Suite 237 San Diego CA 92130 Tel 619 792-8021 FOILED AGAIN! has excellent instruction manual sample airfoils use additional airfoils type data published books magazines Supplementary airfoil data disks available Cygnet Software plotting program allows options variations experimentation instance its easy change skin thickness drawn plot ribs specified 1A6 skin thickness because ribs will covered balsa sheeting capstrips dont have artist experiment airfoils modifications made entering numbers menu-driven program experimentation done airfoil patterns plotted simple dot-matrix printer times need sizes need paper patterns can used two different ways make ribs First can glued directly balsa cut out individually pairs makes quick work series different-length ribs tapered wing section Second paper pattern can glued plywood make pattern plywood pattern durable enough used guide cutting 52 Model Aviation n SD-7032 plots chord lengths 61/2 9 inches tapered panels light coat spray adhesive tacks paper patterns balsa multiple ribs example 20 ribs needed wings center non tapered panel foam wing makers plywood template can used guide hot wire cutting foam wing cores After ribs templates cut wing construction proceeds usual Making own ribs eliminates fear breaking rib destroying rib removing die-cut sheet disaster causing great consternation angst maybe cussword Replacements broken ribs quickiy easily cut balsa stock duplicate paper pattern Its paper balsa instead hard-to-replace part Computer assisted airfoil plotting clearly step forward builders have artist experiment airfoils. January1994 53 Three center-panel rib stages Top plot wing sheeting thickness center plywood cutting pattern bottom balsa rib made using plywood guide Ribs cut hand using razor knife Two layers balsa cut same timeone side wing Pins hold work steady volume production same-size ribs paper pattern glued /8 plywood used cutting guide Pins keep stack alignment
Edition: Model Aviation - 1994/01
Page Numbers: 52, 53
Foiling around Computer U David Garwood PC-generated rib patterns save time frustration say youd scratch-building demon knew easy way make accurate wing rib patterns youd try new airfoil foam could easily make accurate cutting templates maybe youd repair elliptical-tip sailplane wing didnt have calculate five rib lengths draw graph paper Computer technology can help builders make balsa wing ribs plywood templates eliminates tedious handplotting airfoils graph paper well calculating rib length spacing distances tapered wing sections can computer airfoil plotting program make patterns traditional built-up construction wing ribs same technology will also help template-makers cut foam wing cores project used FOILED AGAIN! PC program published Cygnet Software 3525 Del Mar Heights Road Suite 237 San Diego CA 92130 Tel 619 792-8021 FOILED AGAIN! has excellent instruction manual sample airfoils use additional airfoils type data published books magazines Supplementary airfoil data disks available Cygnet Software plotting program allows options variations experimentation instance its easy change skin thickness drawn plot ribs specified 1A6 skin thickness because ribs will covered balsa sheeting capstrips dont have artist experiment airfoils modifications made entering numbers menu-driven program experimentation done airfoil patterns plotted simple dot-matrix printer times need sizes need paper patterns can used two different ways make ribs First can glued directly balsa cut out individually pairs makes quick work series different-length ribs tapered wing section Second paper pattern can glued plywood make pattern plywood pattern durable enough used guide cutting 52 Model Aviation n SD-7032 plots chord lengths 61/2 9 inches tapered panels light coat spray adhesive tacks paper patterns balsa multiple ribs example 20 ribs needed wings center non tapered panel foam wing makers plywood template can used guide hot wire cutting foam wing cores After ribs templates cut wing construction proceeds usual Making own ribs eliminates fear breaking rib destroying rib removing die-cut sheet disaster causing great consternation angst maybe cussword Replacements broken ribs quickiy easily cut balsa stock duplicate paper pattern Its paper balsa instead hard-to-replace part Computer assisted airfoil plotting clearly step forward builders have artist experiment airfoils. January1994 53 Three center-panel rib stages Top plot wing sheeting thickness center plywood cutting pattern bottom balsa rib made using plywood guide Ribs cut hand using razor knife Two layers balsa cut same timeone side wing Pins hold work steady volume production same-size ribs paper pattern glued /8 plywood used cutting guide Pins keep stack alignment