AS WE promised last months safety column subject time safety control line circle Unfortunately have active CL flying years material presented comes letters weve received readers articles have appeared club newsletters thank correspondents time have taken put thoughts experiences paper letter Larry Miles Mission KS partly responsible column Larry states As cost oil continues rise cars keep getting smaller cost modeling supplies rises people start looking inexpensive recreation believe CL activity going take sharp turn upward within next few months people will start using school playgrounds parking lots neighborhood parks etc fly new planes pilots will beginners unaware safety hazards unless forewarned believe would worthwhile wrote column basic dos donts would protect spectators participants air craft might also useful suggested engine kit manufacturers print bulletin inclusion within engine package and/or kits similar column Such article would also serve good reminder whove flown number years such basics have faded memories think could stand such reminder agree wholeheartedly Larry list dos donts CL matter also RC FF operations would useful addition promoting safe flying However previously stated CL strong point other hand readers would like have go compiling such list would glad publish comments readers see what could publicize about Any takers can find somebody draft Safety Guidelines CL Operation document per haps can make use some following material have received First another letter Ken McClenahan electrical engineer made some comments previous column concerning electrocution deaths CL fliers due contact overhead power lines Kens letter has some suggestions concerning safe distances keep mind have fly proximity high voltage power lines have unable come up positive recommendation after looking National Electrical Safety Code NESC bible involved string ing power distribution lines etc Ken states refer NESC should keep following mind 1 best knowledge have no experiments subject human waving 60- 70-foot long conductor general direction energized overhead power line should always extremely cautious empirical evidence lacking 2 Control Line pilots prone wander around especially downwind direction Therefore advisable use safe clearance values much conservative listed NESC being expert subject didnt offer values safe clearances now think should offer gut feelings subject anyway because unlikely ever come up truly satisfactory answer Amen JP Let minimum safe distance K eet n number insulators string suspension insulators overhead power line make no recommendation concerning pin post stick-type insulators since no obvious way relate insulator types voltage line K constant following values K lying downwind line K lying crosswind line K lying upwind line Add 60 ft K flying multiple pilot event such Combat clearance should considered distance between outer edge flying circle nearest point directly below nearest phase conductor overhead power line Incidentally site used Combat Nats last year clearance about 30 feet both downwind upwind Neediess say thought extremely hazardous location though flew anyway Perhaps AMA needs have rules subject QIUiUFEtT Frill COMES FIRST month Required reading CL fliers Some good reminders about basic safety factors Also note gasoline plastic fuel tanks John Preston last paragraph Kens letter may have response comment made about CL 1979 Nats last letter him file copy appears have vanished Perhaps indeed AMA should have some rules safe operation CL other types models too recently wrote district VP Chuck Foreman suggesting AMA should have permanent safety committee Chuck introduced motion Executive Council meeting defeated until information submitter idea presented Unfortunately submitter doesnt seem have five minutes himself recently follow up Perhaps busy summer schedule lets up will get back Any comments readers formation safety committee will welcomed Send electrocution may hazard flier CL model being struck model its component parts likely hazard bystander helper have several pieces correspondence subject Unlike RC FF models path CL aircraft fixed unless somebody strays circle collision person should remote possibility However CL fliers know lines can break engines have known come loose reason another have received several letters subject line integrity concerning breakage engine mounts Larry Miles again has some suggestions minimize possibility line breakage due either fatigue abrasion both point line exits end fitting Appar ently end fittings use copper soft brass sleeve usually conjunction brass thimble may suffer problem Figure 3 page 16 current AMA rule book shows such end fitting solution quote Larry drop two epoxy points line would normally abrade against end fitting has proven satisfactory Solder might better though unable get solder adhere cables ran suggestion past Ron McNally chairman CL Contest Board Rons response follows crimped tube ending stranded control lines illustrated AMA rule book Fig 3 p 16 supplied some ready-made lines has number failure modes crimp itself probably always weakens line some extent experience new lines fail during pull test fail crimp Neither factory crimping nor competitor crimping have monopoly form failure Another failure mode occurs because crimp creates concentrated flexure point drop epoxy may help case shouldnt hurt much would recommend solder would create another concentrated flexure point soldering heat may seriously weaken lines flux may time also weaken lines Ron concludes saying However really want things right should use method illustrated AMA rule book CL General Fig 2 p 16 method done properly creates ending strong lines themselves difficult properly just dont create kinks sharp bends Another letter pointed out shortcomings crimped ends control lines received Jack Finkenthal Astoria NY Jack also another safety tip offer Flying Control Line models high grass involved presents hazard flier have seen lines snag grass takeoff model turned inward left ground nearly struck pilot Before leaving subject control line integrity word about line clips best end fittings world will help ifthe line clips let go Mike Anderson editor Sunbeam newsletter Ames Sundusters MAC writes uble check clips time walk past Check way center circle Continued page 124 October 1980 69 Model 2 received its current registra tion NC1 lY Transcontinental Westem Air Inc obtained NCL 1 Y NAT November 27 1931 Alpha Model 2 carried loads cargo TWA until February 1932 flown Stearman plant Wichita modifications over Model 4A specifications total 182638 flying hours accumulated NC1 lY time As Model 4A NC1 lY shared TWAs 24-hour coast-to-coast service shared mishaps also first incident Columbus OH March 1 1932 bent streamline wheel fairing resulted mud collecting freezing NC 11 Y suffered several delays due tire blowouts plus hitting obstructions airports boundary lights moved notification Alpha pilots TWA pilot Ted Hereford flying Number 12 TWAs assigned fleet number NC1IY March 15 1933 collided bird departed feathered creature caused six-inch deep 18-inch-wide dent leading edge wing NCL lY would feel hands fame February2l 1933 asCol CharlesA Lindbergh took command cockpit Lindbergh serving Technical Advisor TWA departed Newark NJ air terminal 1030 am stopping North Beach Airport NY pick up Ernest R Breech president General Aviation Mfg Corp Landing Baltimore Lindbergh Breech made inspection single-engine General GA-43 aircraft after Alpha 4A Lone Eagle would return Newark 535 pm Number 12 represented TWA until April 26 1935 sold Frederick B Lee New York Lee outfitted NC1 1 Y floats hoping fly Alpha around world dream never fulfilled Model 4A converted back land-plane August 1937 another New Yorker Harry Spaulding bought NCl 1 Y sell craft Richard E Connely Ridgefield CT December 1937 Passing through several owners Alpha would acquired May 1946 Foster Hannaford Jr Winnetka IL Hannaford would search country Alpha airframes accessories purpose preserving remarkable aircraft posterity However passed away 1971 NC1 lY part sister Alpha bequeathed Experi mental Aircraft Association Hales Corners WI EAA stored Alpha assemblage Burling ton WI fall 1974 trade Model 4A NASM North American XP-5 1 Apache arranged Smithsonian contacted Trans-World Airlines determine Alpha could saved made presentable July 4 1976 bicentennial dedication National Air Spwze Museum Alpha Project set motion TWA volunteers March 1975 Alpha collection gathered EAAs storage barn trans ported TWA Technical Services Center Kansas City MO restoration project such magnitude would normally require two three years yet volunteer TWAers logged 3500 total man-hours completed job eight months TWA Stearman-Northrop Alpha 4A unveiled public ceremonies TWAs giant 747 hangar Kansas City January 26 1976 gleaming gem presented National Air Space Museum February 2 1976 gift aviation history celebration TWAs Golden Anniversary US Bicentennial Safety Preston Continued page 69 way back after flight Check walk lines kinks way back again st check make pull test plane set lines should pulled once day Just give good pull handle someone holds plane youre going pull guts out it might well ground would like draw attention pull test chart can found current AMA rule book page 15 beginners feel forces specified chart appear exces sive would ask watch film footage two multi-engine Scale CL models AMA film Modelings Grand Illusions angie fliers have lean restrain models graphic example forces can generated lines wind up discussion CL safety have some suggestions engine mounting Doug Dahlke Oshkosh WI Doug sent us sketch stunt model profile fuselage showed engine bearers continued rearwards terminate above below wing Doug calls approach profile proof states single important thing can profile improve engine run safety together Appar ently profile kits market bearers terminate some distance ahead wing creating weakness could lead engine parting company fuselage final note before signing off month last safety column stated despite some stories going around modeling circles gasoline does dissolve either Sullivan Kraft fuel tanks During last month have heard Byron Originals has issued bulletin advising against use gasoline Sullivan tank has apparently supplied kits Despite advice have no evidence change previous position John Preston 7012 Elvira Cour Falls Church VA 22042 Drake/Willard Continued page 68 access openingsthe hatch hole wing areamust sealed carefully seal hatch tailor hull structure fit hatch structure almost press fit fly off water run vaseline along edges oozes out insert hatch added 124 Model Aviation WEVE EXPANDEDI \N R/C SCALE DRAWINGS PHOTOS BOOKLETS Christmas Cards free Brochures REPLA TECHLEISURE TIME GRAPHICS NTERNAT DNARO BOX 108A STATEN IS NY 10306 CATALOGS $2006SOO C KNZ B Hwy VOA OBSOCN 974GB
Edition: Model Aviation - 1980/10
Page Numbers: 69, 124
AS WE promised last months safety column subject time safety control line circle Unfortunately have active CL flying years material presented comes letters weve received readers articles have appeared club newsletters thank correspondents time have taken put thoughts experiences paper letter Larry Miles Mission KS partly responsible column Larry states As cost oil continues rise cars keep getting smaller cost modeling supplies rises people start looking inexpensive recreation believe CL activity going take sharp turn upward within next few months people will start using school playgrounds parking lots neighborhood parks etc fly new planes pilots will beginners unaware safety hazards unless forewarned believe would worthwhile wrote column basic dos donts would protect spectators participants air craft might also useful suggested engine kit manufacturers print bulletin inclusion within engine package and/or kits similar column Such article would also serve good reminder whove flown number years such basics have faded memories think could stand such reminder agree wholeheartedly Larry list dos donts CL matter also RC FF operations would useful addition promoting safe flying However previously stated CL strong point other hand readers would like have go compiling such list would glad publish comments readers see what could publicize about Any takers can find somebody draft Safety Guidelines CL Operation document per haps can make use some following material have received First another letter Ken McClenahan electrical engineer made some comments previous column concerning electrocution deaths CL fliers due contact overhead power lines Kens letter has some suggestions concerning safe distances keep mind have fly proximity high voltage power lines have unable come up positive recommendation after looking National Electrical Safety Code NESC bible involved string ing power distribution lines etc Ken states refer NESC should keep following mind 1 best knowledge have no experiments subject human waving 60- 70-foot long conductor general direction energized overhead power line should always extremely cautious empirical evidence lacking 2 Control Line pilots prone wander around especially downwind direction Therefore advisable use safe clearance values much conservative listed NESC being expert subject didnt offer values safe clearances now think should offer gut feelings subject anyway because unlikely ever come up truly satisfactory answer Amen JP Let minimum safe distance K eet n number insulators string suspension insulators overhead power line make no recommendation concerning pin post stick-type insulators since no obvious way relate insulator types voltage line K constant following values K lying downwind line K lying crosswind line K lying upwind line Add 60 ft K flying multiple pilot event such Combat clearance should considered distance between outer edge flying circle nearest point directly below nearest phase conductor overhead power line Incidentally site used Combat Nats last year clearance about 30 feet both downwind upwind Neediess say thought extremely hazardous location though flew anyway Perhaps AMA needs have rules subject QIUiUFEtT Frill COMES FIRST month Required reading CL fliers Some good reminders about basic safety factors Also note gasoline plastic fuel tanks John Preston last paragraph Kens letter may have response comment made about CL 1979 Nats last letter him file copy appears have vanished Perhaps indeed AMA should have some rules safe operation CL other types models too recently wrote district VP Chuck Foreman suggesting AMA should have permanent safety committee Chuck introduced motion Executive Council meeting defeated until information submitter idea presented Unfortunately submitter doesnt seem have five minutes himself recently follow up Perhaps busy summer schedule lets up will get back Any comments readers formation safety committee will welcomed Send electrocution may hazard flier CL model being struck model its component parts likely hazard bystander helper have several pieces correspondence subject Unlike RC FF models path CL aircraft fixed unless somebody strays circle collision person should remote possibility However CL fliers know lines can break engines have known come loose reason another have received several letters subject line integrity concerning breakage engine mounts Larry Miles again has some suggestions minimize possibility line breakage due either fatigue abrasion both point line exits end fitting Appar ently end fittings use copper soft brass sleeve usually conjunction brass thimble may suffer problem Figure 3 page 16 current AMA rule book shows such end fitting solution quote Larry drop two epoxy points line would normally abrade against end fitting has proven satisfactory Solder might better though unable get solder adhere cables ran suggestion past Ron McNally chairman CL Contest Board Rons response follows crimped tube ending stranded control lines illustrated AMA rule book Fig 3 p 16 supplied some ready-made lines has number failure modes crimp itself probably always weakens line some extent experience new lines fail during pull test fail crimp Neither factory crimping nor competitor crimping have monopoly form failure Another failure mode occurs because crimp creates concentrated flexure point drop epoxy may help case shouldnt hurt much would recommend solder would create another concentrated flexure point soldering heat may seriously weaken lines flux may time also weaken lines Ron concludes saying However really want things right should use method illustrated AMA rule book CL General Fig 2 p 16 method done properly creates ending strong lines themselves difficult properly just dont create kinks sharp bends Another letter pointed out shortcomings crimped ends control lines received Jack Finkenthal Astoria NY Jack also another safety tip offer Flying Control Line models high grass involved presents hazard flier have seen lines snag grass takeoff model turned inward left ground nearly struck pilot Before leaving subject control line integrity word about line clips best end fittings world will help ifthe line clips let go Mike Anderson editor Sunbeam newsletter Ames Sundusters MAC writes uble check clips time walk past Check way center circle Continued page 124 October 1980 69 Model 2 received its current registra tion NC1 lY Transcontinental Westem Air Inc obtained NCL 1 Y NAT November 27 1931 Alpha Model 2 carried loads cargo TWA until February 1932 flown Stearman plant Wichita modifications over Model 4A specifications total 182638 flying hours accumulated NC1 lY time As Model 4A NC1 lY shared TWAs 24-hour coast-to-coast service shared mishaps also first incident Columbus OH March 1 1932 bent streamline wheel fairing resulted mud collecting freezing NC 11 Y suffered several delays due tire blowouts plus hitting obstructions airports boundary lights moved notification Alpha pilots TWA pilot Ted Hereford flying Number 12 TWAs assigned fleet number NC1IY March 15 1933 collided bird departed feathered creature caused six-inch deep 18-inch-wide dent leading edge wing NCL lY would feel hands fame February2l 1933 asCol CharlesA Lindbergh took command cockpit Lindbergh serving Technical Advisor TWA departed Newark NJ air terminal 1030 am stopping North Beach Airport NY pick up Ernest R Breech president General Aviation Mfg Corp Landing Baltimore Lindbergh Breech made inspection single-engine General GA-43 aircraft after Alpha 4A Lone Eagle would return Newark 535 pm Number 12 represented TWA until April 26 1935 sold Frederick B Lee New York Lee outfitted NC1 1 Y floats hoping fly Alpha around world dream never fulfilled Model 4A converted back land-plane August 1937 another New Yorker Harry Spaulding bought NCl 1 Y sell craft Richard E Connely Ridgefield CT December 1937 Passing through several owners Alpha would acquired May 1946 Foster Hannaford Jr Winnetka IL Hannaford would search country Alpha airframes accessories purpose preserving remarkable aircraft posterity However passed away 1971 NC1 lY part sister Alpha bequeathed Experi mental Aircraft Association Hales Corners WI EAA stored Alpha assemblage Burling ton WI fall 1974 trade Model 4A NASM North American XP-5 1 Apache arranged Smithsonian contacted Trans-World Airlines determine Alpha could saved made presentable July 4 1976 bicentennial dedication National Air Spwze Museum Alpha Project set motion TWA volunteers March 1975 Alpha collection gathered EAAs storage barn trans ported TWA Technical Services Center Kansas City MO restoration project such magnitude would normally require two three years yet volunteer TWAers logged 3500 total man-hours completed job eight months TWA Stearman-Northrop Alpha 4A unveiled public ceremonies TWAs giant 747 hangar Kansas City January 26 1976 gleaming gem presented National Air Space Museum February 2 1976 gift aviation history celebration TWAs Golden Anniversary US Bicentennial Safety Preston Continued page 69 way back after flight Check walk lines kinks way back again st check make pull test plane set lines should pulled once day Just give good pull handle someone holds plane youre going pull guts out it might well ground would like draw attention pull test chart can found current AMA rule book page 15 beginners feel forces specified chart appear exces sive would ask watch film footage two multi-engine Scale CL models AMA film Modelings Grand Illusions angie fliers have lean restrain models graphic example forces can generated lines wind up discussion CL safety have some suggestions engine mounting Doug Dahlke Oshkosh WI Doug sent us sketch stunt model profile fuselage showed engine bearers continued rearwards terminate above below wing Doug calls approach profile proof states single important thing can profile improve engine run safety together Appar ently profile kits market bearers terminate some distance ahead wing creating weakness could lead engine parting company fuselage final note before signing off month last safety column stated despite some stories going around modeling circles gasoline does dissolve either Sullivan Kraft fuel tanks During last month have heard Byron Originals has issued bulletin advising against use gasoline Sullivan tank has apparently supplied kits Despite advice have no evidence change previous position John Preston 7012 Elvira Cour Falls Church VA 22042 Drake/Willard Continued page 68 access openingsthe hatch hole wing areamust sealed carefully seal hatch tailor hull structure fit hatch structure almost press fit fly off water run vaseline along edges oozes out insert hatch added 124 Model Aviation WEVE EXPANDEDI \N R/C SCALE DRAWINGS PHOTOS BOOKLETS Christmas Cards free Brochures REPLA TECHLEISURE TIME GRAPHICS NTERNAT DNARO BOX 108A STATEN IS NY 10306 CATALOGS $2006SOO C KNZ B Hwy VOA OBSOCN 974GB