CONTROL LINE AEROBATICS IN THE LAST COLUMN discussed some state-of-the-art advances Precision Aerobatics models looking later constniction techniques built-up structures such Lost Foam method object course build precise true structures As concept matured however options other merely duplicating standard construction patterns became available Now possible correctly assemble accurate geodetic wings first time time gives such added benefits stiffness inherent geodetic approach also allows reduction structures parts count therefore weight what really after critical point several assumptions necessarily go along driving toward ever-elusive light weight goal Practically speaking doesnt good 45-ounce piped model flexes anything dead air its controls wash out cracks after first few flights structure must rigid maintain accuracy built under sustained heavy flight loads durable capital D tenets compromised youre trouble best example goes back Nationals held Reno Nevada top competitors concerned about altitude heat quite few lightweight models left cars because just too flexible older heavier rigid models flowna bit fasterand did reasonably well Any discussion regarding light weight must deal use composite materials forms carbon fiber have extremely effective reinforcing structures Except few Stunt models however have doubts its potential has reached have used strips 007 014 x 250 inch reinforce structures probably didnt require general design current structures has followed traditional techniques techniques developed using composite technology Paul Walkers work carbon main spars I-beam configuration direction foresee construction technology going always kicker just up-front time investment make jig Lost Foam technique time required design structure draw up composite structure visualize one-piece wing spar construct mold lay up structure epoxy carbon makes tired just thinking about Cataloging whats required infuse type technology brings up question worth process requires lengthy highly accurate work havent seffled specific design could certainly generate lot repetitious effort proven design time can amortized over models possibly commercial application designs such Pattern Master SVl2 series etc So far Ive thinking about interior structure components next logical step major components wings stabs fuselages RC community have successful fiberglass fuselages some carbon reinforcement some designed take-apart sections FAt Team Race community especially Russians have done major work carbon fuselages very limited production viewed examples both T/R FAI Speed 93 Nationals Continued page 104 June 1994 101 Lew McFarland EVSC designs Dolphin Shark 45 held Buddy Barbee L Derek Barry R Randy Smiths Precision Aero 40 its high-quality internal components will available time printed Tom Lowe Midwest PT-19 completed Christmas present son Mike student Southern Illinois University Bart Klapinskis 67 Nats winner Mccoy 40 Note odd-shaped Nobler its piped pilot background R/C BEGINNERS DONT GIVE UP Unfortunately MOST advertised R/C trainers much too fast unstable average beginner take heart because YOU COULD SOLO YOUR VERY FIRST TIME UP No longer mislead Thanks extensive treiner flight-testing ever conducted hobby can now know advance ones will fly slow hands-ofi stable just so-so intermediate trainers grossly misnamed pull no punches Send $350 plus 520 postage br EASE-OF-FLYING RATINGS OF RIC TRAINERS Over 40 models evaluated includingAR Ft Also grades ease-of-build ing explains basic aerodynamics dares address questions poor trainers good trainers marketed does no warn about GUARANTEED enlightening time-saving money-saving R/G publication have ever read money back Also available Flying lessons written especially lone eagle must go alone Lesrning Fly R/C Without Instructor $395 plus 75o postage Includes trouble-shooting flight problems Send check money order JIm Waterman 3818 Deerfield Dr San Antonio TX 78218 5000 different 22000 3-view drawings color FOTOPAAKS including KOKUFAN Antiques Military Civilian Helicopters SilpIa Catalog/Guide $600Overseas CL AerobaticslMcMillan Continued page 101 spectacular showed can done its matter size addition newer lighter forms carbon becoming available Russia just lightweight mat available down 25 ounce per square yard woven material necessary proper strength also becoming available reasonable prices Im sure working carbon will somewhat different fiberglass certainly manageable Again major project because molds investment materiais see viable option save weight improve durability sure would want know design before proceeding flying surfaces another story Sailplane competitors commonly use glassskinned wings fabricated vacuum-bag method superb systems apply skins readily available reasonable prices Because wing types different what mind Stunt wing has much volume perhaps approach other skinning foam may have used Some years ago Al Rabe devised approach working up semiscale MK 22 Spiffire elegant design much style famous Mustangs Bearcats concept molding drive total time investment making semi-scale Stunter down approximately 800 hours yes thats accurate 100-150 hours idea detail molds ail blisters scopes panel lines etc lay up shells top base color plane assembled trim insignia needed applied back wing designhis design involved three major moldings main section entire leading edge high point top wrapping around leading edge bottom high point section contained full shape wing including dihedral becomes building block assemble interior structure remaining carbon sections Think wing true monocoque structure Some substructure mount components such landing gear retracting gears controls etc will required fullspan full-depth main spar wide caps would installed used support bonding top rear section bottom rear section completes structure Several ribs support outer structure would necessary concept sounds great hasnt done yet leading edge mold developed time early 80s lightweight carbon cloth available reasonable cost As tail surfaces have doubts molded surface can made light some new geodetic structures Certainly reinforcement carbon strips proven method increase strength decrease structure thereby saving weight Having just finished several open-bay geodetic stabs recommend give try did believe strong would until built own Use flat stab rather airfoil since seem track better much easier builders align properly pull together predicting going dont see major components being molded carbon near future see use molded major substructures wing stab spars wont technological jump evolutionary step semi-scales tried again perhaps fully molded composite Stunter will surface New Product Aero Products 1880 Scenic Highway Snellville GA 30278 announces new series Control Line Stunt engines Precision Acro 40 engine designed manufactured Randy Smith Henry Nelson designed specifically CL Aerobatics inside out features mildly timed AAC piston liner dual high-speed ball bearings true venturi engines available four different versions side rear exhaust timing piped standard configurations engine handassembled blueprinted Weight exceptionally light slightly ten ounces Contact Randy above address telephone him 404 979-2035 fax 404 985-5085 Model Aviation J ELECTRONICS 900 Lucy Road Howell Michigan 48843 517-546-2644 U~lService & Repairs Most Radio Control Systems izing Calibrated Test Equipment & Spectrum Analyzers Endorsed AMA/RCMA Sticker Station #105 Futaba Airtronics JR Ace HiTec Tower Cirrus World Engines & WE USE GENUINE FACTORY REPLACEMENT PARTS Complete 1991 Narrow Banding & Upgrades RCD / HITEC R/C DEALER FCC Licensed Speed Control Repairs Quality Service Fast Turn Around Shipping & Insurance ExtraUPSUS Mail CODs _ V&4[FZM w w VISA / N4ASTERCARD & DISCOVER WELCOMED AMA #256123ARRLWB8YSQ
Edition: Model Aviation - 1994/06
Page Numbers: 101, 104
CONTROL LINE AEROBATICS IN THE LAST COLUMN discussed some state-of-the-art advances Precision Aerobatics models looking later constniction techniques built-up structures such Lost Foam method object course build precise true structures As concept matured however options other merely duplicating standard construction patterns became available Now possible correctly assemble accurate geodetic wings first time time gives such added benefits stiffness inherent geodetic approach also allows reduction structures parts count therefore weight what really after critical point several assumptions necessarily go along driving toward ever-elusive light weight goal Practically speaking doesnt good 45-ounce piped model flexes anything dead air its controls wash out cracks after first few flights structure must rigid maintain accuracy built under sustained heavy flight loads durable capital D tenets compromised youre trouble best example goes back Nationals held Reno Nevada top competitors concerned about altitude heat quite few lightweight models left cars because just too flexible older heavier rigid models flowna bit fasterand did reasonably well Any discussion regarding light weight must deal use composite materials forms carbon fiber have extremely effective reinforcing structures Except few Stunt models however have doubts its potential has reached have used strips 007 014 x 250 inch reinforce structures probably didnt require general design current structures has followed traditional techniques techniques developed using composite technology Paul Walkers work carbon main spars I-beam configuration direction foresee construction technology going always kicker just up-front time investment make jig Lost Foam technique time required design structure draw up composite structure visualize one-piece wing spar construct mold lay up structure epoxy carbon makes tired just thinking about Cataloging whats required infuse type technology brings up question worth process requires lengthy highly accurate work havent seffled specific design could certainly generate lot repetitious effort proven design time can amortized over models possibly commercial application designs such Pattern Master SVl2 series etc So far Ive thinking about interior structure components next logical step major components wings stabs fuselages RC community have successful fiberglass fuselages some carbon reinforcement some designed take-apart sections FAt Team Race community especially Russians have done major work carbon fuselages very limited production viewed examples both T/R FAI Speed 93 Nationals Continued page 104 June 1994 101 Lew McFarland EVSC designs Dolphin Shark 45 held Buddy Barbee L Derek Barry R Randy Smiths Precision Aero 40 its high-quality internal components will available time printed Tom Lowe Midwest PT-19 completed Christmas present son Mike student Southern Illinois University Bart Klapinskis 67 Nats winner Mccoy 40 Note odd-shaped Nobler its piped pilot background R/C BEGINNERS DONT GIVE UP Unfortunately MOST advertised R/C trainers much too fast unstable average beginner take heart because YOU COULD SOLO YOUR VERY FIRST TIME UP No longer mislead Thanks extensive treiner flight-testing ever conducted hobby can now know advance ones will fly slow hands-ofi stable just so-so intermediate trainers grossly misnamed pull no punches Send $350 plus 520 postage br EASE-OF-FLYING RATINGS OF RIC TRAINERS Over 40 models evaluated includingAR Ft Also grades ease-of-build ing explains basic aerodynamics dares address questions poor trainers good trainers marketed does no warn about GUARANTEED enlightening time-saving money-saving R/G publication have ever read money back Also available Flying lessons written especially lone eagle must go alone Lesrning Fly R/C Without Instructor $395 plus 75o postage Includes trouble-shooting flight problems Send check money order JIm Waterman 3818 Deerfield Dr San Antonio TX 78218 5000 different 22000 3-view drawings color FOTOPAAKS including KOKUFAN Antiques Military Civilian Helicopters SilpIa Catalog/Guide $600Overseas CL AerobaticslMcMillan Continued page 101 spectacular showed can done its matter size addition newer lighter forms carbon becoming available Russia just lightweight mat available down 25 ounce per square yard woven material necessary proper strength also becoming available reasonable prices Im sure working carbon will somewhat different fiberglass certainly manageable Again major project because molds investment materiais see viable option save weight improve durability sure would want know design before proceeding flying surfaces another story Sailplane competitors commonly use glassskinned wings fabricated vacuum-bag method superb systems apply skins readily available reasonable prices Because wing types different what mind Stunt wing has much volume perhaps approach other skinning foam may have used Some years ago Al Rabe devised approach working up semiscale MK 22 Spiffire elegant design much style famous Mustangs Bearcats concept molding drive total time investment making semi-scale Stunter down approximately 800 hours yes thats accurate 100-150 hours idea detail molds ail blisters scopes panel lines etc lay up shells top base color plane assembled trim insignia needed applied back wing designhis design involved three major moldings main section entire leading edge high point top wrapping around leading edge bottom high point section contained full shape wing including dihedral becomes building block assemble interior structure remaining carbon sections Think wing true monocoque structure Some substructure mount components such landing gear retracting gears controls etc will required fullspan full-depth main spar wide caps would installed used support bonding top rear section bottom rear section completes structure Several ribs support outer structure would necessary concept sounds great hasnt done yet leading edge mold developed time early 80s lightweight carbon cloth available reasonable cost As tail surfaces have doubts molded surface can made light some new geodetic structures Certainly reinforcement carbon strips proven method increase strength decrease structure thereby saving weight Having just finished several open-bay geodetic stabs recommend give try did believe strong would until built own Use flat stab rather airfoil since seem track better much easier builders align properly pull together predicting going dont see major components being molded carbon near future see use molded major substructures wing stab spars wont technological jump evolutionary step semi-scales tried again perhaps fully molded composite Stunter will surface New Product Aero Products 1880 Scenic Highway Snellville GA 30278 announces new series Control Line Stunt engines Precision Acro 40 engine designed manufactured Randy Smith Henry Nelson designed specifically CL Aerobatics inside out features mildly timed AAC piston liner dual high-speed ball bearings true venturi engines available four different versions side rear exhaust timing piped standard configurations engine handassembled blueprinted Weight exceptionally light slightly ten ounces Contact Randy above address telephone him 404 979-2035 fax 404 985-5085 Model Aviation J ELECTRONICS 900 Lucy Road Howell Michigan 48843 517-546-2644 U~lService & Repairs Most Radio Control Systems izing Calibrated Test Equipment & Spectrum Analyzers Endorsed AMA/RCMA Sticker Station #105 Futaba Airtronics JR Ace HiTec Tower Cirrus World Engines & WE USE GENUINE FACTORY REPLACEMENT PARTS Complete 1991 Narrow Banding & Upgrades RCD / HITEC R/C DEALER FCC Licensed Speed Control Repairs Quality Service Fast Turn Around Shipping & Insurance ExtraUPSUS Mail CODs _ V&4[FZM w w VISA / N4ASTERCARD & DISCOVER WELCOMED AMA #256123ARRLWB8YSQ