FREE FLIGHT INDOOR 200 ft 8 ft 175 ft 150 ft 12 t Qoft 75ft 5Oft 41 ft 20 inches25 ft IIII 2ft3ft4ft5ft6ft7ft8ft Allowable altitude gain loss during steering Figure 1 Figure 2 Universal templatetop view [] Figure 3 Universal templateend view 69% ______________________________ IlK Figure 4 Airfoil camber STEERING BAN REVISITED Indoor Contest Board rejected proposed ban steering AMA class models initial vote vote affirms steering will remain part AMA contest strategy following passages Competition Regulations can serve review CDs contestants alike regarding important steering parameter change altitude during steering 11 Steering Model Steering intended alter direction flight general location model approaching structure building intent rule avoid influencing either altitude model its rate climb descent during period steering Steering rules AMA events shall identical current rules FAI Indoor Models FlD 347 Steering Model use balloon line rod a Steering must used avert collision structure building its contents other models Movements model must primarily horizontal plane Note If timekeepers opinion models change altitude approaching one-half meter meter 25m altitude whichever larger will warn competitor Continued disregard timekeepers warning will result terminated flight Figure 1 summarizes allowable change altitude model being steered permissible altitude gain/loss ranges approximately 20 inches model altitude 41 feet lower much eight feet altitude 200 feet timers contestants should review information before flying begins Tape Newsletters recent column noted received newsletter letter slipped open end suggested prevent happening Since have received several newsletters improved packaging newsletters assembled clever manner solved problem reduced number operations required prepare newsletter mailing Good work Flying Opportunities sessions listed below latest information available Contact persons other areas included CDs events beginning June 1995 send schedules ASAP listings below include specific announced dates See previous columns listings sites having continuing access Always verify contest date phone before leaving home ConnecticutNorwich Flying sessions held throughout fall winter Teachers Memorial Junior High School Norwich Beginners welcome assistance provided veteran aeromodelers Last session 1994-95 scheduled Saturday April 15 1995 9 am 1 pm Contact John Koptonak 3 Wiemes Ct Waterford CT 06385 Tel 203 442-9003 ConnecticutStratford Flying sessions Fridays Stratford High School 7-930 pm April 28 May 5 May 19 June 2 June 16 1995 site similar Glastonbury except flat ceiling acoustic tile located near Town Hall Fire House Contact John Kagan July 1995 105 Normal ribs 3699 Broadbridge Ave Apt 310 Stratford CT 06497 Tel 203 378-8940 FloridaThe following session Tampa MacDill rounds out Florida Indoor season State Indoor Meet #6 April 22-23 Armed Forces Day meet last State meet MIAMA s 24th Indoor season includes mass launch biplanes May 20-21 1995 Contact John Martin 2180 Tigertail Ave Miami FL 33133 Tel 305 858-6363 IdahoKibbie Dome Kibbie Dome Annual Will held week July 1213 1995 Andy Tagliafico 10039 Quail Post Rd Portland OR 97219 Tel 503 371-0492 Easy B Internation MeetJuly 14 1995 Andy Tagliafico 10039 Quail Post Rd Portland OR 97219 Tel 503 371-0492 Indoor NatsJuly 15-18 1995 Contact Abram Van Dover 112 Tillerson Dr Newport News VA 23602 Tel 804 8772830 New JerseyLakehurst 1994 flying sessions/contests/record trials Hangar #1 scheduled almost weekend between July end October information 1995 season send Gary Underwood SASE 24 Kennebec Ct Bordentown NJ 08505 call 609 3249004 New YorkBrooklyn Indoor contest April 22-23 1994 Blue Nose Hangar Floyd Bennett Field Brooklyn Site has 150 x 450-foot floor 45 feet rafters field truss beam easy retrieval Contact Ed Whitten 67 Riverside Dr #9A New York NY 10024 Tel 212 7240282 PennsylvaniaReading Reading Indoor Air Races DKI Hangar Reading Airport May 6 1995 9 am-5 pm Six FAC Scale events six mass-launch events Contact Tom Sanders Jr 9 Kern Dr Perkasie PA 18944 Tel 215 249-1409 TennesseeJohnson City Add events listed May 93 column MIAMA sponsored Grand Prix Saturday evening Contact John Martin 2180 Tigertail Ave Miami FL 33133 Tel 305 858-6363 VirginiaHampton area Langley Brainbusters winter indoor contest schedule concludes meet Apr 23 1994 1-6 pm contest will held SBH Gym features EZ-13 Limited Pennyplane Bostonian No Cal A-6 8Inch hand-launch glider Mini Stick events count scoring Contact Abram Van Dover 112 Tillerson Dr Newport News VA 23602 Tel 804 8772830 Tan II Lore Shortly after Tan II became available various reports attributed properties good bad new rubber Further experience Tan II has disproved some early reports proving others Energy storage Most reports now confirm better energy storage Tan Temperature sensitivity Early reports energy sag lower temperatures have always proven out Cat flights 60 degrees could detect sag 94 World Championships US team prepared both Tan Pirelli used Tan II cold no problems fact cold bad info also believed some European teams no Tan Slanic Some outdoor fliers have reported broken strands Coupe motors flown 90-degree weather neither Jim Clem nor experienced breakage mechanical damage 93-degree lowhumidity air Lubbock Nats Under same conditions Stan Chilton experienced high level breakage Either two factors may explain different experiences Jim Clem use either Armor Son Gun automotive vinyl restorers lubricant some part breakin/winding cycle particular dip finger thumb Armor massage knots during final phase winding believe both cools lubricates rubber Also neither Jim nor stretch rubber far Stan does during initial winding Universal Rib Template various times have discussed laminated ribs Techniques used Stan Chilton Andy Tagliafico discussed laminated ribs have included various kinds reinforcement including boron common element has molds forms templates rib station must have separate template sets rib length camber Andys method uses male female form sandwich laminations holds contact until glue has dried After seeing well Jim Clems version Bernard Hunts Easy B flew decided build Easy B patterned after Jims wing has both regular diagonal ribs wing offset three lengths diagonal ribs needed After fretting about building forms idea Suppose curved surface exactly width wing minus spar thickness longer needed lay out diagonal ribs Figure 2 shows top view just such fixture showing ribs laid across form diagonal positions marked fixture same angle wing two three thin strips laid across form top previous strip Finally thin strip plastic food wrap stretched across length rib hold place until glue dries Figure 3 shows end view prototype form 1/16 balsa sheet warped across three support strips form curve Obviously different placement strips will vary curvature thickness sets amount camber plan try 015 styrene sheet curved plate next fixture thin vertical lines located inner boundary spars show cut line after glue has curedWet-molding balsa fashion requires no-stick surface form tried plastic food wrap worked well lot trouble apply wrinkle-free discovered 3M Magic Mending Tape cloudy stuff worked quite well parting agent thinned glue used have settled thinned aliphatic resin Elmers Carpenters Glue source have excellent results using seven eight parts water part resin What Camber Really us tend quote camber thickness percent thickness being same template form Stan Chilton has pointed out real camber higher illustrated Figure 4 rib camber 69 percent additional depth airfoil due spars increases real camber 133 percent section Figure 3 NFFS Digest Fumes Lungs & HealthA safety note Terry Thorkildsen average modeler exposed lot toxic fumes result hobby An OSHA official would probably cringe see average modeler uses paints solvents adhesives Since us should intelligent adults protect lungs exposing yourself fumes can purchase simple mask respirator does good job protecting around $29 major discount chains like Home Depot Standard Brands also sold major paint stores Get has two charcoal chemical filters side Both 3M Norton make good ones strongly suggest painting outside minimize fumes 106 Model Aviation paints epoxies cure area away family epoxies especially bad extra careful using Following practices will help live longer enjoy favorite hobby word about respirators size does fit Faces different masks different better go safety supply house try several masks until get tight store should able test fit something like banana oil can smell oil mask does fit have beard will never get good fit mask will always leak also can buy different canisters different pollutants sure get right canister designed dust will filter out epoxy fumes Impulse Sensitivity Catapult Gliders Lubbock Nats HLG/Catapult time slot 7 am- 2 pm no HLG official Catapult event canceled few HLG fliers plenty air space practice waited see minimum five Catapult fliers would turn out time unofficial Catapult contest After several hours sanding drilling gouging glider lost 20 percent 139 grams weighed USIC just over 11 grams drastically overweight site four hours steady practice got trim zeroed just right also time perfect trajectory circled outside shrouded speakers did split-S pattern past far side scoreboard launch rnbbr six-inch loop 6/94 Tan Ilwhich came 1/s-inch flat ample power actually manageable loop /4-inch flat used Johnson City Part experimentation included using half loopabout three inchesinstead whole loop Since loop stretched same launch length short loop gave model much higher initial accelerationwhat rocket guys call impulse trajectory different high low impulse levels probably should surprise PAl Power fliers deal kind problem using auto flaps auto rudders other stuff difference power model set up essentially zero-zero accelerates continuously until auto-stuff cuts catapult glider necessity zerozero moving fastest ihstant release cant use auto-stuff pitching moments wing stab lift must nearly uniform across range speed launch glide Im sure varying launch impulse useful technique hope someone will try Im lucky have access site three hours year HLG/Catapult activity cant count time experiment SAM 86 Newsletter Some Food Thought About Rubberby Moe Whittemore Mostly scientific some subjective might interest modelers Losses due friction among strands wound motor negligible virtual equivalence between stretched wound motors Lube forget friction approximately /3 energy wind motor lost hysteresis during unwinding Hysteresis due 1 Latent heat crystalization 2 Breaking weak cross-links 3 Possible slippage among molecular chains reducing hysteresis losses requires changes manufacturing including adjustments quantity sulphur used vulcanization Costs money Vulcanization heating raw rubber sulphur 2840F Vulcanization reduces tendency rubber crystallize An 8 % sulphur/natural rubber vulcanizate showed little-if-any crystallization 26 % considered normal production value come dont get stuff knee curve marks onset crystalization extension ratio point 572 vulcanized rubber Since ratio 80 good rule-of-thumb marker good contest rubber crystalize time lag can seconds hours between application stress appearance crystallization X-ray diffraction pattern Thats wound motors occasionally blow up after launch extension ratios less three internal energy losses negligible winds wimpy Processing carbon black increases tensile strength abrasion resistance Sounds like FAI black Softening agents mineral oils paraffin etc cause swelling rubber Beware castor oil Now know what know Tipsfrom NFFS Digest Potato peelers stamped kind long pointing slotted blade found store sells kitchen gadgets great carving leading edges blocks props wear out time Corn files plastic boards similar emery board about 35 inches long except embedded fairly coarse black abrasive material Theyre good rough-shaping nose blocks cowlings leading edges etc washable clogged emergency can used corns callouses Found Dr Scholls foot aid displays drug variety stores Capital Area Antique Modelers Association ISRMI newsletter February 1993 issue 1995 107 Build Full-Size Aircraft Fly Find out can build own kitplane ultralight aircraft t yoursefl Join EAA get EXPERIMENTFR Magazine $28 Learn techniques composite wood metal tube fabric applications Join local FAA Chapter take advantage programs like FAAs Flight Advisors Technical Counselors Information Services cially helpful first time builders FAA also offers comprehensive aviation finance insurance packages Call 1 -800-JOIN EAA 1-800-564-6322 put FUN Flying Experimental Aircraft Association PO Box 3086 Oshkosh WI 54903-3086Aug
Edition: Model Aviation - 1995/07
Page Numbers: 105, 106, 107
Edition: Model Aviation - 1995/07
Page Numbers: 105, 106, 107
FREE FLIGHT INDOOR 200 ft 8 ft 175 ft 150 ft 12 t Qoft 75ft 5Oft 41 ft 20 inches25 ft IIII 2ft3ft4ft5ft6ft7ft8ft Allowable altitude gain loss during steering Figure 1 Figure 2 Universal templatetop view [] Figure 3 Universal templateend view 69% ______________________________ IlK Figure 4 Airfoil camber STEERING BAN REVISITED Indoor Contest Board rejected proposed ban steering AMA class models initial vote vote affirms steering will remain part AMA contest strategy following passages Competition Regulations can serve review CDs contestants alike regarding important steering parameter change altitude during steering 11 Steering Model Steering intended alter direction flight general location model approaching structure building intent rule avoid influencing either altitude model its rate climb descent during period steering Steering rules AMA events shall identical current rules FAI Indoor Models FlD 347 Steering Model use balloon line rod a Steering must used avert collision structure building its contents other models Movements model must primarily horizontal plane Note If timekeepers opinion models change altitude approaching one-half meter meter 25m altitude whichever larger will warn competitor Continued disregard timekeepers warning will result terminated flight Figure 1 summarizes allowable change altitude model being steered permissible altitude gain/loss ranges approximately 20 inches model altitude 41 feet lower much eight feet altitude 200 feet timers contestants should review information before flying begins Tape Newsletters recent column noted received newsletter letter slipped open end suggested prevent happening Since have received several newsletters improved packaging newsletters assembled clever manner solved problem reduced number operations required prepare newsletter mailing Good work Flying Opportunities sessions listed below latest information available Contact persons other areas included CDs events beginning June 1995 send schedules ASAP listings below include specific announced dates See previous columns listings sites having continuing access Always verify contest date phone before leaving home ConnecticutNorwich Flying sessions held throughout fall winter Teachers Memorial Junior High School Norwich Beginners welcome assistance provided veteran aeromodelers Last session 1994-95 scheduled Saturday April 15 1995 9 am 1 pm Contact John Koptonak 3 Wiemes Ct Waterford CT 06385 Tel 203 442-9003 ConnecticutStratford Flying sessions Fridays Stratford High School 7-930 pm April 28 May 5 May 19 June 2 June 16 1995 site similar Glastonbury except flat ceiling acoustic tile located near Town Hall Fire House Contact John Kagan July 1995 105 Normal ribs 3699 Broadbridge Ave Apt 310 Stratford CT 06497 Tel 203 378-8940 FloridaThe following session Tampa MacDill rounds out Florida Indoor season State Indoor Meet #6 April 22-23 Armed Forces Day meet last State meet MIAMA s 24th Indoor season includes mass launch biplanes May 20-21 1995 Contact John Martin 2180 Tigertail Ave Miami FL 33133 Tel 305 858-6363 IdahoKibbie Dome Kibbie Dome Annual Will held week July 1213 1995 Andy Tagliafico 10039 Quail Post Rd Portland OR 97219 Tel 503 371-0492 Easy B Internation MeetJuly 14 1995 Andy Tagliafico 10039 Quail Post Rd Portland OR 97219 Tel 503 371-0492 Indoor NatsJuly 15-18 1995 Contact Abram Van Dover 112 Tillerson Dr Newport News VA 23602 Tel 804 8772830 New JerseyLakehurst 1994 flying sessions/contests/record trials Hangar #1 scheduled almost weekend between July end October information 1995 season send Gary Underwood SASE 24 Kennebec Ct Bordentown NJ 08505 call 609 3249004 New YorkBrooklyn Indoor contest April 22-23 1994 Blue Nose Hangar Floyd Bennett Field Brooklyn Site has 150 x 450-foot floor 45 feet rafters field truss beam easy retrieval Contact Ed Whitten 67 Riverside Dr #9A New York NY 10024 Tel 212 7240282 PennsylvaniaReading Reading Indoor Air Races DKI Hangar Reading Airport May 6 1995 9 am-5 pm Six FAC Scale events six mass-launch events Contact Tom Sanders Jr 9 Kern Dr Perkasie PA 18944 Tel 215 249-1409 TennesseeJohnson City Add events listed May 93 column MIAMA sponsored Grand Prix Saturday evening Contact John Martin 2180 Tigertail Ave Miami FL 33133 Tel 305 858-6363 VirginiaHampton area Langley Brainbusters winter indoor contest schedule concludes meet Apr 23 1994 1-6 pm contest will held SBH Gym features EZ-13 Limited Pennyplane Bostonian No Cal A-6 8Inch hand-launch glider Mini Stick events count scoring Contact Abram Van Dover 112 Tillerson Dr Newport News VA 23602 Tel 804 8772830 Tan II Lore Shortly after Tan II became available various reports attributed properties good bad new rubber Further experience Tan II has disproved some early reports proving others Energy storage Most reports now confirm better energy storage Tan Temperature sensitivity Early reports energy sag lower temperatures have always proven out Cat flights 60 degrees could detect sag 94 World Championships US team prepared both Tan Pirelli used Tan II cold no problems fact cold bad info also believed some European teams no Tan Slanic Some outdoor fliers have reported broken strands Coupe motors flown 90-degree weather neither Jim Clem nor experienced breakage mechanical damage 93-degree lowhumidity air Lubbock Nats Under same conditions Stan Chilton experienced high level breakage Either two factors may explain different experiences Jim Clem use either Armor Son Gun automotive vinyl restorers lubricant some part breakin/winding cycle particular dip finger thumb Armor massage knots during final phase winding believe both cools lubricates rubber Also neither Jim nor stretch rubber far Stan does during initial winding Universal Rib Template various times have discussed laminated ribs Techniques used Stan Chilton Andy Tagliafico discussed laminated ribs have included various kinds reinforcement including boron common element has molds forms templates rib station must have separate template sets rib length camber Andys method uses male female form sandwich laminations holds contact until glue has dried After seeing well Jim Clems version Bernard Hunts Easy B flew decided build Easy B patterned after Jims wing has both regular diagonal ribs wing offset three lengths diagonal ribs needed After fretting about building forms idea Suppose curved surface exactly width wing minus spar thickness longer needed lay out diagonal ribs Figure 2 shows top view just such fixture showing ribs laid across form diagonal positions marked fixture same angle wing two three thin strips laid across form top previous strip Finally thin strip plastic food wrap stretched across length rib hold place until glue dries Figure 3 shows end view prototype form 1/16 balsa sheet warped across three support strips form curve Obviously different placement strips will vary curvature thickness sets amount camber plan try 015 styrene sheet curved plate next fixture thin vertical lines located inner boundary spars show cut line after glue has curedWet-molding balsa fashion requires no-stick surface form tried plastic food wrap worked well lot trouble apply wrinkle-free discovered 3M Magic Mending Tape cloudy stuff worked quite well parting agent thinned glue used have settled thinned aliphatic resin Elmers Carpenters Glue source have excellent results using seven eight parts water part resin What Camber Really us tend quote camber thickness percent thickness being same template form Stan Chilton has pointed out real camber higher illustrated Figure 4 rib camber 69 percent additional depth airfoil due spars increases real camber 133 percent section Figure 3 NFFS Digest Fumes Lungs & HealthA safety note Terry Thorkildsen average modeler exposed lot toxic fumes result hobby An OSHA official would probably cringe see average modeler uses paints solvents adhesives Since us should intelligent adults protect lungs exposing yourself fumes can purchase simple mask respirator does good job protecting around $29 major discount chains like Home Depot Standard Brands also sold major paint stores Get has two charcoal chemical filters side Both 3M Norton make good ones strongly suggest painting outside minimize fumes 106 Model Aviation paints epoxies cure area away family epoxies especially bad extra careful using Following practices will help live longer enjoy favorite hobby word about respirators size does fit Faces different masks different better go safety supply house try several masks until get tight store should able test fit something like banana oil can smell oil mask does fit have beard will never get good fit mask will always leak also can buy different canisters different pollutants sure get right canister designed dust will filter out epoxy fumes Impulse Sensitivity Catapult Gliders Lubbock Nats HLG/Catapult time slot 7 am- 2 pm no HLG official Catapult event canceled few HLG fliers plenty air space practice waited see minimum five Catapult fliers would turn out time unofficial Catapult contest After several hours sanding drilling gouging glider lost 20 percent 139 grams weighed USIC just over 11 grams drastically overweight site four hours steady practice got trim zeroed just right also time perfect trajectory circled outside shrouded speakers did split-S pattern past far side scoreboard launch rnbbr six-inch loop 6/94 Tan Ilwhich came 1/s-inch flat ample power actually manageable loop /4-inch flat used Johnson City Part experimentation included using half loopabout three inchesinstead whole loop Since loop stretched same launch length short loop gave model much higher initial accelerationwhat rocket guys call impulse trajectory different high low impulse levels probably should surprise PAl Power fliers deal kind problem using auto flaps auto rudders other stuff difference power model set up essentially zero-zero accelerates continuously until auto-stuff cuts catapult glider necessity zerozero moving fastest ihstant release cant use auto-stuff pitching moments wing stab lift must nearly uniform across range speed launch glide Im sure varying launch impulse useful technique hope someone will try Im lucky have access site three hours year HLG/Catapult activity cant count time experiment SAM 86 Newsletter Some Food Thought About Rubberby Moe Whittemore Mostly scientific some subjective might interest modelers Losses due friction among strands wound motor negligible virtual equivalence between stretched wound motors Lube forget friction approximately /3 energy wind motor lost hysteresis during unwinding Hysteresis due 1 Latent heat crystalization 2 Breaking weak cross-links 3 Possible slippage among molecular chains reducing hysteresis losses requires changes manufacturing including adjustments quantity sulphur used vulcanization Costs money Vulcanization heating raw rubber sulphur 2840F Vulcanization reduces tendency rubber crystallize An 8 % sulphur/natural rubber vulcanizate showed little-if-any crystallization 26 % considered normal production value come dont get stuff knee curve marks onset crystalization extension ratio point 572 vulcanized rubber Since ratio 80 good rule-of-thumb marker good contest rubber crystalize time lag can seconds hours between application stress appearance crystallization X-ray diffraction pattern Thats wound motors occasionally blow up after launch extension ratios less three internal energy losses negligible winds wimpy Processing carbon black increases tensile strength abrasion resistance Sounds like FAI black Softening agents mineral oils paraffin etc cause swelling rubber Beware castor oil Now know what know Tipsfrom NFFS Digest Potato peelers stamped kind long pointing slotted blade found store sells kitchen gadgets great carving leading edges blocks props wear out time Corn files plastic boards similar emery board about 35 inches long except embedded fairly coarse black abrasive material Theyre good rough-shaping nose blocks cowlings leading edges etc washable clogged emergency can used corns callouses Found Dr Scholls foot aid displays drug variety stores Capital Area Antique Modelers Association ISRMI newsletter February 1993 issue 1995 107 Build Full-Size Aircraft Fly Find out can build own kitplane ultralight aircraft t yoursefl Join EAA get EXPERIMENTFR Magazine $28 Learn techniques composite wood metal tube fabric applications Join local FAA Chapter take advantage programs like FAAs Flight Advisors Technical Counselors Information Services cially helpful first time builders FAA also offers comprehensive aviation finance insurance packages Call 1 -800-JOIN EAA 1-800-564-6322 put FUN Flying Experimental Aircraft Association PO Box 3086 Oshkosh WI 54903-3086Aug
Edition: Model Aviation - 1995/07
Page Numbers: 105, 106, 107
FREE FLIGHT INDOOR 200 ft 8 ft 175 ft 150 ft 12 t Qoft 75ft 5Oft 41 ft 20 inches25 ft IIII 2ft3ft4ft5ft6ft7ft8ft Allowable altitude gain loss during steering Figure 1 Figure 2 Universal templatetop view [] Figure 3 Universal templateend view 69% ______________________________ IlK Figure 4 Airfoil camber STEERING BAN REVISITED Indoor Contest Board rejected proposed ban steering AMA class models initial vote vote affirms steering will remain part AMA contest strategy following passages Competition Regulations can serve review CDs contestants alike regarding important steering parameter change altitude during steering 11 Steering Model Steering intended alter direction flight general location model approaching structure building intent rule avoid influencing either altitude model its rate climb descent during period steering Steering rules AMA events shall identical current rules FAI Indoor Models FlD 347 Steering Model use balloon line rod a Steering must used avert collision structure building its contents other models Movements model must primarily horizontal plane Note If timekeepers opinion models change altitude approaching one-half meter meter 25m altitude whichever larger will warn competitor Continued disregard timekeepers warning will result terminated flight Figure 1 summarizes allowable change altitude model being steered permissible altitude gain/loss ranges approximately 20 inches model altitude 41 feet lower much eight feet altitude 200 feet timers contestants should review information before flying begins Tape Newsletters recent column noted received newsletter letter slipped open end suggested prevent happening Since have received several newsletters improved packaging newsletters assembled clever manner solved problem reduced number operations required prepare newsletter mailing Good work Flying Opportunities sessions listed below latest information available Contact persons other areas included CDs events beginning June 1995 send schedules ASAP listings below include specific announced dates See previous columns listings sites having continuing access Always verify contest date phone before leaving home ConnecticutNorwich Flying sessions held throughout fall winter Teachers Memorial Junior High School Norwich Beginners welcome assistance provided veteran aeromodelers Last session 1994-95 scheduled Saturday April 15 1995 9 am 1 pm Contact John Koptonak 3 Wiemes Ct Waterford CT 06385 Tel 203 442-9003 ConnecticutStratford Flying sessions Fridays Stratford High School 7-930 pm April 28 May 5 May 19 June 2 June 16 1995 site similar Glastonbury except flat ceiling acoustic tile located near Town Hall Fire House Contact John Kagan July 1995 105 Normal ribs 3699 Broadbridge Ave Apt 310 Stratford CT 06497 Tel 203 378-8940 FloridaThe following session Tampa MacDill rounds out Florida Indoor season State Indoor Meet #6 April 22-23 Armed Forces Day meet last State meet MIAMA s 24th Indoor season includes mass launch biplanes May 20-21 1995 Contact John Martin 2180 Tigertail Ave Miami FL 33133 Tel 305 858-6363 IdahoKibbie Dome Kibbie Dome Annual Will held week July 1213 1995 Andy Tagliafico 10039 Quail Post Rd Portland OR 97219 Tel 503 371-0492 Easy B Internation MeetJuly 14 1995 Andy Tagliafico 10039 Quail Post Rd Portland OR 97219 Tel 503 371-0492 Indoor NatsJuly 15-18 1995 Contact Abram Van Dover 112 Tillerson Dr Newport News VA 23602 Tel 804 8772830 New JerseyLakehurst 1994 flying sessions/contests/record trials Hangar #1 scheduled almost weekend between July end October information 1995 season send Gary Underwood SASE 24 Kennebec Ct Bordentown NJ 08505 call 609 3249004 New YorkBrooklyn Indoor contest April 22-23 1994 Blue Nose Hangar Floyd Bennett Field Brooklyn Site has 150 x 450-foot floor 45 feet rafters field truss beam easy retrieval Contact Ed Whitten 67 Riverside Dr #9A New York NY 10024 Tel 212 7240282 PennsylvaniaReading Reading Indoor Air Races DKI Hangar Reading Airport May 6 1995 9 am-5 pm Six FAC Scale events six mass-launch events Contact Tom Sanders Jr 9 Kern Dr Perkasie PA 18944 Tel 215 249-1409 TennesseeJohnson City Add events listed May 93 column MIAMA sponsored Grand Prix Saturday evening Contact John Martin 2180 Tigertail Ave Miami FL 33133 Tel 305 858-6363 VirginiaHampton area Langley Brainbusters winter indoor contest schedule concludes meet Apr 23 1994 1-6 pm contest will held SBH Gym features EZ-13 Limited Pennyplane Bostonian No Cal A-6 8Inch hand-launch glider Mini Stick events count scoring Contact Abram Van Dover 112 Tillerson Dr Newport News VA 23602 Tel 804 8772830 Tan II Lore Shortly after Tan II became available various reports attributed properties good bad new rubber Further experience Tan II has disproved some early reports proving others Energy storage Most reports now confirm better energy storage Tan Temperature sensitivity Early reports energy sag lower temperatures have always proven out Cat flights 60 degrees could detect sag 94 World Championships US team prepared both Tan Pirelli used Tan II cold no problems fact cold bad info also believed some European teams no Tan Slanic Some outdoor fliers have reported broken strands Coupe motors flown 90-degree weather neither Jim Clem nor experienced breakage mechanical damage 93-degree lowhumidity air Lubbock Nats Under same conditions Stan Chilton experienced high level breakage Either two factors may explain different experiences Jim Clem use either Armor Son Gun automotive vinyl restorers lubricant some part breakin/winding cycle particular dip finger thumb Armor massage knots during final phase winding believe both cools lubricates rubber Also neither Jim nor stretch rubber far Stan does during initial winding Universal Rib Template various times have discussed laminated ribs Techniques used Stan Chilton Andy Tagliafico discussed laminated ribs have included various kinds reinforcement including boron common element has molds forms templates rib station must have separate template sets rib length camber Andys method uses male female form sandwich laminations holds contact until glue has dried After seeing well Jim Clems version Bernard Hunts Easy B flew decided build Easy B patterned after Jims wing has both regular diagonal ribs wing offset three lengths diagonal ribs needed After fretting about building forms idea Suppose curved surface exactly width wing minus spar thickness longer needed lay out diagonal ribs Figure 2 shows top view just such fixture showing ribs laid across form diagonal positions marked fixture same angle wing two three thin strips laid across form top previous strip Finally thin strip plastic food wrap stretched across length rib hold place until glue dries Figure 3 shows end view prototype form 1/16 balsa sheet warped across three support strips form curve Obviously different placement strips will vary curvature thickness sets amount camber plan try 015 styrene sheet curved plate next fixture thin vertical lines located inner boundary spars show cut line after glue has curedWet-molding balsa fashion requires no-stick surface form tried plastic food wrap worked well lot trouble apply wrinkle-free discovered 3M Magic Mending Tape cloudy stuff worked quite well parting agent thinned glue used have settled thinned aliphatic resin Elmers Carpenters Glue source have excellent results using seven eight parts water part resin What Camber Really us tend quote camber thickness percent thickness being same template form Stan Chilton has pointed out real camber higher illustrated Figure 4 rib camber 69 percent additional depth airfoil due spars increases real camber 133 percent section Figure 3 NFFS Digest Fumes Lungs & HealthA safety note Terry Thorkildsen average modeler exposed lot toxic fumes result hobby An OSHA official would probably cringe see average modeler uses paints solvents adhesives Since us should intelligent adults protect lungs exposing yourself fumes can purchase simple mask respirator does good job protecting around $29 major discount chains like Home Depot Standard Brands also sold major paint stores Get has two charcoal chemical filters side Both 3M Norton make good ones strongly suggest painting outside minimize fumes 106 Model Aviation paints epoxies cure area away family epoxies especially bad extra careful using Following practices will help live longer enjoy favorite hobby word about respirators size does fit Faces different masks different better go safety supply house try several masks until get tight store should able test fit something like banana oil can smell oil mask does fit have beard will never get good fit mask will always leak also can buy different canisters different pollutants sure get right canister designed dust will filter out epoxy fumes Impulse Sensitivity Catapult Gliders Lubbock Nats HLG/Catapult time slot 7 am- 2 pm no HLG official Catapult event canceled few HLG fliers plenty air space practice waited see minimum five Catapult fliers would turn out time unofficial Catapult contest After several hours sanding drilling gouging glider lost 20 percent 139 grams weighed USIC just over 11 grams drastically overweight site four hours steady practice got trim zeroed just right also time perfect trajectory circled outside shrouded speakers did split-S pattern past far side scoreboard launch rnbbr six-inch loop 6/94 Tan Ilwhich came 1/s-inch flat ample power actually manageable loop /4-inch flat used Johnson City Part experimentation included using half loopabout three inchesinstead whole loop Since loop stretched same launch length short loop gave model much higher initial accelerationwhat rocket guys call impulse trajectory different high low impulse levels probably should surprise PAl Power fliers deal kind problem using auto flaps auto rudders other stuff difference power model set up essentially zero-zero accelerates continuously until auto-stuff cuts catapult glider necessity zerozero moving fastest ihstant release cant use auto-stuff pitching moments wing stab lift must nearly uniform across range speed launch glide Im sure varying launch impulse useful technique hope someone will try Im lucky have access site three hours year HLG/Catapult activity cant count time experiment SAM 86 Newsletter Some Food Thought About Rubberby Moe Whittemore Mostly scientific some subjective might interest modelers Losses due friction among strands wound motor negligible virtual equivalence between stretched wound motors Lube forget friction approximately /3 energy wind motor lost hysteresis during unwinding Hysteresis due 1 Latent heat crystalization 2 Breaking weak cross-links 3 Possible slippage among molecular chains reducing hysteresis losses requires changes manufacturing including adjustments quantity sulphur used vulcanization Costs money Vulcanization heating raw rubber sulphur 2840F Vulcanization reduces tendency rubber crystallize An 8 % sulphur/natural rubber vulcanizate showed little-if-any crystallization 26 % considered normal production value come dont get stuff knee curve marks onset crystalization extension ratio point 572 vulcanized rubber Since ratio 80 good rule-of-thumb marker good contest rubber crystalize time lag can seconds hours between application stress appearance crystallization X-ray diffraction pattern Thats wound motors occasionally blow up after launch extension ratios less three internal energy losses negligible winds wimpy Processing carbon black increases tensile strength abrasion resistance Sounds like FAI black Softening agents mineral oils paraffin etc cause swelling rubber Beware castor oil Now know what know Tipsfrom NFFS Digest Potato peelers stamped kind long pointing slotted blade found store sells kitchen gadgets great carving leading edges blocks props wear out time Corn files plastic boards similar emery board about 35 inches long except embedded fairly coarse black abrasive material Theyre good rough-shaping nose blocks cowlings leading edges etc washable clogged emergency can used corns callouses Found Dr Scholls foot aid displays drug variety stores Capital Area Antique Modelers Association ISRMI newsletter February 1993 issue 1995 107 Build Full-Size Aircraft Fly Find out can build own kitplane ultralight aircraft t yoursefl Join EAA get EXPERIMENTFR Magazine $28 Learn techniques composite wood metal tube fabric applications Join local FAA Chapter take advantage programs like FAAs Flight Advisors Technical Counselors Information Services cially helpful first time builders FAA also offers comprehensive aviation finance insurance packages Call 1 -800-JOIN EAA 1-800-564-6322 put FUN Flying Experimental Aircraft Association PO Box 3086 Oshkosh WI 54903-3086Aug
