____first Sbnws WE THOUGHT controversy over maxi mum size model aircraft resolved AMA Executive Cbuncil voted adopt same 55 lb weight limit enforced Canada Australia ever have revised thoughts after attendance Councils October 23 1982 meeting agenda contained no less three items concerning maximum model aircraft size can sum marized follows I Aircraft Size Safety Guidelines sub mitted Council proposal adoption IMAA contain comprehensive guidelines construction operation Giant-sized model aircraft section wing loading sug gests maximum 48 oz sq ft maximum model weight 100 lbs whichever least 2 Letter One-Eighth Air Eorce written Kent Walters requests further study model weight limit consideration weight limit 90-lb range multi-engine models present 44 cu engine displacement limit 53B2 AMA rule book maintained 3 Rules change proposal Gen-84-9 submitted AMA Bill Northrop would establish 40 lbs weight limit model aircraft far majority readers have cor responded us subject maximum model weight regard current 55-lb limit too heasv Rationale consensus differs quite number stated believed Council acted haste should have based its decision something tangible Canadian weight limit also proponents higher weight-limit feel likewise little explained about reasoning 55-lb limit other apparently limit similarly imposed Canada MAAC co incided Eederal-imposed highway speed limit doubt Council based its deci sion latter limit Rather reopen discussion maxi mum model size within itself Council has turned over members AMA Safety Committee resolution committee will asked consider issues concerning model air craft size requirements report back Coun cil recommendation Since happen member Safety Committee would like solicit opinions readers Let said AMA makes snap decisions some dingy basement room Headquarters First look IMAA Safety Guidelines have formulated 1MAA Board Directors copy received form brochure introduction written IMAA President Don Godfrey IMAA seeking recognition special interest group within AMA structure since associa tion has over 3000 members appears logical should selected collective voice Giant-sized-model builder Don states following introduction guidelines IMAA presently working AMA formulate reasonable attitude towards Giant Scale safety regulation IMAA can viable asset AMA within structure IMAAs very own organization IMAA cannot satisfactorily reach proper conclusion problem who-shall-make-Giant Scale regu lations what degree IMAA will have no choice go independent following proposed guidelines understand will also printed next issue High Flight IMAAs quarterly newsletter IMAA Aircraft Size & Safety Guidelines Section Maximunt Wingspan Maximum al lowable wingspan gasoline-powered radio controlled aircraft shall exceed sixteen feet 16 ft 5 percent 5% override may allowa ble aircraft true nature scale dimensions exceed 16-ft span Section IlMaximum Wing Loading Maximum wtng loading shall exceed 48 ounces per square foot wing area hundred pounds 100 lb total aircraft weight whichever least Section III Alaximunt Engine Sizes Single-engine aircraft 46 Cu maximum Twin-engine aircraft 83 cu total Multi-engine aircraft 96 Cu total attempt exceed 12 pounds aircraft per cubic inch engine displacement ignition engines regardless size shall have onboard kill switches either servo-operated man ual glow engines used Giant RC aircrqft shall hase on-board system will stop engine radio command requirements mandator t Section VOn-Board Fuel Capacity minimum per engine 13 to 315 Cu 16 oz fuel tank 37 to 43 Cu 24 oz fuel tank Over 43 Cu engine 32 oz fuel tank Reserve fuel supplies eliminate deadstick land ings Section VRadio Equipment minimum require ment A To standard ECC-approved quality B Servos rated heavy duty min imum 24 inch-ounce thrust non-critical control functions minimum 45 inchounce stress functions use servo per aileron servo stabilizerleft / stabilizer-right strongly recommended Use dual servos recommended C Batteries on-board shall 1000 mAb up 20 lb 1200 mAh 30 lb l800 mAh 40 lb 2000 mAh over 40 lb D Redundant fail-safe battery systems recommended E The use anti-glitch devices long leads recommended Section VI Mechanical Components A Servo arms servo wheels rated heavy duty B Control horns rated heavy duty Continued page 14 12 Model Aviation Ji -/ 511 liii ThAT GUY UP5TAPS S BUILDIN THEM BG AEROTHNG5 AGAIN Now Great Planes World Aerobatic Giant Scale design CAP 21 Easy build easy fly Its latest design France U Heres perfect Giant Scale project winter Great Planes new Cap 21 Cap 21 easy build because incidence downthrust angles molded Plus Cap 21 features Great Planes precision machine cut sanded parts go together right first time new Cap 21 easy fly too dont let its good manners fool Cap 21 loves snap maneuvers its wide speed envelope Cap 21 has challenge enough satisfy seasoned veteran KIT INCLUDES Epoxy-Glass Fuselage Cowl Wheel Pants Aluminum Dural Landing Gear Foam Wing Stabilizer Fin Rudder Clear Plastic Molded Canopy Special Hardware Full Size Rolled Plans Complete Instructions Sheeting 68 long U WingSpan 88 U Wing Area 1144 sq ins U Requires 4 Channel Radio 2 Aileron Servos U Flying Weight 16Y2 18 lbs U DESIGNED FOR QUADRA ENGINE Available favorite R/C dealer *REThMPAN 1ODEL MANUFACTU P0 BOX 2URBANANO S 61001 217/367-2069 C Control surface linkage order preference 1 Cable system push-pull pull-pull 2 Golden Rod Sullivan Push-pull 3 Arrow shaft fiberglass aluminum 1/4in 5/16-in OD 4 Hardwood dowel 3/8-in OD 5 Sig Carbon Rods D Hinges rated heavy duty manu factured Giant RC Aircraft use Home made original-design hinges acceptable determined adequate intended use E Clevis attachment hardware should heavy duty 4/40 thread rod type Rods 2/56 thread size acceptable applications Clevis have lock nuts keepers Section VIIFlight Testing De-Bugging man datory Giant-type RC Aircraft flown IMAA- AMA-sanctioned events must have flown flight tested flight trimmed minimum six 6 flights before such aircraft may safety checked entered fly Section VhfSafety Check mandatory Giant-type RC Aircraft flown IMAA-or AMA-sanctioned events must spected approved flight approved safety personnel event aircraft involved crash acident no matter minor air craft will have inspected Safety Officer once again approved flight providing aircraft repaired made ready additional flying same entered event Section IXProof Flight mandatory Must submitted IMAA- AMA-sanctioned events I Submission photographs showing aircraft flight 2 Signature builder/flier attesting fact Section XIAircraft Exceeding Max Size Regu lations mandatory Aircraft exceed wing loading 48 oz per sq ft 100 lb total may flown IMAA- AMA-sanctioned events under following conditions I Proof adequate insurance special poli cies etc 2 AMA FCC licenses required 3 Event sponsoring organization has purchased additional insurance covering pilot operator spectators minimum $1 million liabil ity coverage 4 Spectators shall assembled no less 100 ft flight line Section XIISafety Officer mandatory IMAA- AMA-sanctioned Giant Scale event shall have appointed Safety Officer turn will appoint Field Marshall addi tional Safety Committee members will responsible safety regulations pilot helpers spotters crowd control fire hazard precau tions smoking regulations pit pass control No prize being offered first person tell us Section X has omitted have deliberately kept IMAA numbering system avoid confusion receive comments second item concerning model aircraft size limits letter Kent Walters written One-Eighth Air Force stationary sent AMA President John Grigg understand entire letter has already published other model magazines conserve space we therefore re Continued page 117 14 Model Aviation Safety/Preston Continued page 14 printing entire letter However anyone desires receive copy SASE address end column will bring Basically what Kent suggesting weight limit around 90 lb multi-engine Scale models rationale permit modeling multi-engine aircraft same scale number popular 60- 90-powered singleengine models claims multi-engine bomber would have about six times weight single-engine fighter modeled same scale other words fighter weighs say 12 15 lb comparable bomber would come out about 72 90 lb letter states may ask make exception weight safety standpoint have seen aircraft flown example made above answer may easy Such aircraft fly relatively slowly very stable aerodynamicallyas would expected comparing performance its full-size counterpart type model also performs very little way serious aerobatic maneu vers reduces probability risk signifi cantly during flight start emphasizing engine displace ment limit such models instead present limiting weight have really placed signifi cant control kinetic energy achieved dur ing flight since aircraft above 55 lb would forced slower velocity attitude letter concludes following state ment Scale modeling community needs opportunity use 60- 90-size engines corresponding size weight airframe model four-engine aircraft achieve what Scale modeler striving fidelity scale nutshell seems should consider last paragraph ask ourselves ques tion Does Scale modeling community need use 60- 90-size engines multi-engine aircraft Bear mind unlike IMAA proposal Kent suggesting engine displacement limit increased last item regarding model size Coun cil referred AMA Safety Committee rules change proposal submitted Bill Nor throp Bills proposal Gen-84-9 published December 1982 issue MA page 114 would add another paragraph Section 4 Gen eral page 7 current rule book paragraph would state 43 Weight Limit Model aircraft weigh ing excess current maximum amount specified AMA competi tion category shall permitted fly AMA-sanctioned competitions AMA-insured activities AMA-in sured flying sites present time RC Giant Scale Section 53B page 83 rule book permits models up 40 lb weight maximum per mitted competition category So unless Giant Scale weight limit upped 55 lb conflict between Bills proposal Council-established weight limit Since no pro posal submitted increase Giant Scale weight limit Council has referred conflict Safety Committee resolution proper note AMA Safety Code weight-limit factor determines whether model covered AMA insurancenot competition rules comments receive address three items concerning maximum fiorndo PROPELLERS Made polyester boil color Go GRISH .the No 1 propeller True helical pitch airfoil win-power Sizes pitches styles needs AT YOUR DEALER 2 Blade Tractor 53each 5-45354ICc 6364SOc 747678SOc 8486687Db 949-69-7 9810410-6Nc 11411-611-8 1 12412-51264180 2 Blade Pusher 5, 3 5-4 6-36-4 SOc 8-6Nc 9-610-6*1 3 Blade Tractor 5-36364 SOc 3 Blade Pusher 6-3HOc Metalige Aluminum Color Tractor 7678 *1 8688$1 96 06104*150 Pusher106$1 GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes chance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 $7 6810 12 PITCH208 2210 24 13 IN 8 & 10 PITCH26$16 RIGHT HAND TRACTOR GRISH~HN INDIANA 46373 Way maintain nicads e ONLY $1 995 SIMPLE CYCLER pay another charger already own Cycle Rx Tx packs easy way throughout year SIMPLE CYCLER gives audible warning packs discharged level recommended manu facturer safely recharge radio systems charger can easily determine percentage power consumed remaining pack Simple sate cheap Connectors included #RED 22 See local hobby shop ucts made USA Send SASE full information CRam 4736 N Milwaukee Ave ago IL 60630 IF UNAVAILABLE LOCALLY ADD $100 FOR DIRECT ORDER NO COD **SAILPLANE**jam launching equipmentl UUI P40 CARD KIT hi-starts/winches/accessoriesFULL COLOR EXACT REPRODUCTION complete line/best prices/top qualityYt/4 sow $500 REM EMBER HOW send self-addressed stampedONLYWELL THEY FLEW envelope catalog/information -SpcII offr Inoludes roupon reusiring RL F PRODUCTS~ ~FIDo nd1 Te R3 Box 178-V Paoli IN 4745418121723-4310~Ak1UNIQUE NOSTALOIc OIFY model size will passed other members AMA Safety Committee suggest anyone wishing comment promptly column being written end October will see until December Pro con would like have input Have safe month John D Preston 7102 Elvira Ct Falls Church VA 22042 RC AerobaticsNan Putte Cont/nued page 43 other way youll end up balsa skin covered glass cloth toilet paper As toilet paper becomes soaked epoxy unroll turn two paper discard Continue rolling until toilet paper stops soaking up epoxy Look closely thejob did youll notice glass cloth securely stuck balsa skin foot two away becomes invisible can see balsa After allowing epoxy cure excess cloth can trimmed around edges balsa skin use water-soluble contact cement stick skin wing thats prefer ence Use whatever works you wrap skin around leading edge wing forget ammonia trick because glass cloth outside skin prevents crack ing Theres no magic just technique Next month plan cover perform Reverse Outside Loop Ron Van Putte 111 Sleepy Oaks Road Ft Walton Beach FL 32548 February 1983 117
Edition: Model Aviation - 1983/02
Page Numbers: 12, 14, 117
____first Sbnws WE THOUGHT controversy over maxi mum size model aircraft resolved AMA Executive Cbuncil voted adopt same 55 lb weight limit enforced Canada Australia ever have revised thoughts after attendance Councils October 23 1982 meeting agenda contained no less three items concerning maximum model aircraft size can sum marized follows I Aircraft Size Safety Guidelines sub mitted Council proposal adoption IMAA contain comprehensive guidelines construction operation Giant-sized model aircraft section wing loading sug gests maximum 48 oz sq ft maximum model weight 100 lbs whichever least 2 Letter One-Eighth Air Eorce written Kent Walters requests further study model weight limit consideration weight limit 90-lb range multi-engine models present 44 cu engine displacement limit 53B2 AMA rule book maintained 3 Rules change proposal Gen-84-9 submitted AMA Bill Northrop would establish 40 lbs weight limit model aircraft far majority readers have cor responded us subject maximum model weight regard current 55-lb limit too heasv Rationale consensus differs quite number stated believed Council acted haste should have based its decision something tangible Canadian weight limit also proponents higher weight-limit feel likewise little explained about reasoning 55-lb limit other apparently limit similarly imposed Canada MAAC co incided Eederal-imposed highway speed limit doubt Council based its deci sion latter limit Rather reopen discussion maxi mum model size within itself Council has turned over members AMA Safety Committee resolution committee will asked consider issues concerning model air craft size requirements report back Coun cil recommendation Since happen member Safety Committee would like solicit opinions readers Let said AMA makes snap decisions some dingy basement room Headquarters First look IMAA Safety Guidelines have formulated 1MAA Board Directors copy received form brochure introduction written IMAA President Don Godfrey IMAA seeking recognition special interest group within AMA structure since associa tion has over 3000 members appears logical should selected collective voice Giant-sized-model builder Don states following introduction guidelines IMAA presently working AMA formulate reasonable attitude towards Giant Scale safety regulation IMAA can viable asset AMA within structure IMAAs very own organization IMAA cannot satisfactorily reach proper conclusion problem who-shall-make-Giant Scale regu lations what degree IMAA will have no choice go independent following proposed guidelines understand will also printed next issue High Flight IMAAs quarterly newsletter IMAA Aircraft Size & Safety Guidelines Section Maximunt Wingspan Maximum al lowable wingspan gasoline-powered radio controlled aircraft shall exceed sixteen feet 16 ft 5 percent 5% override may allowa ble aircraft true nature scale dimensions exceed 16-ft span Section IlMaximum Wing Loading Maximum wtng loading shall exceed 48 ounces per square foot wing area hundred pounds 100 lb total aircraft weight whichever least Section III Alaximunt Engine Sizes Single-engine aircraft 46 Cu maximum Twin-engine aircraft 83 cu total Multi-engine aircraft 96 Cu total attempt exceed 12 pounds aircraft per cubic inch engine displacement ignition engines regardless size shall have onboard kill switches either servo-operated man ual glow engines used Giant RC aircrqft shall hase on-board system will stop engine radio command requirements mandator t Section VOn-Board Fuel Capacity minimum per engine 13 to 315 Cu 16 oz fuel tank 37 to 43 Cu 24 oz fuel tank Over 43 Cu engine 32 oz fuel tank Reserve fuel supplies eliminate deadstick land ings Section VRadio Equipment minimum require ment A To standard ECC-approved quality B Servos rated heavy duty min imum 24 inch-ounce thrust non-critical control functions minimum 45 inchounce stress functions use servo per aileron servo stabilizerleft / stabilizer-right strongly recommended Use dual servos recommended C Batteries on-board shall 1000 mAb up 20 lb 1200 mAh 30 lb l800 mAh 40 lb 2000 mAh over 40 lb D Redundant fail-safe battery systems recommended E The use anti-glitch devices long leads recommended Section VI Mechanical Components A Servo arms servo wheels rated heavy duty B Control horns rated heavy duty Continued page 14 12 Model Aviation Ji -/ 511 liii ThAT GUY UP5TAPS S BUILDIN THEM BG AEROTHNG5 AGAIN Now Great Planes World Aerobatic Giant Scale design CAP 21 Easy build easy fly Its latest design France U Heres perfect Giant Scale project winter Great Planes new Cap 21 Cap 21 easy build because incidence downthrust angles molded Plus Cap 21 features Great Planes precision machine cut sanded parts go together right first time new Cap 21 easy fly too dont let its good manners fool Cap 21 loves snap maneuvers its wide speed envelope Cap 21 has challenge enough satisfy seasoned veteran KIT INCLUDES Epoxy-Glass Fuselage Cowl Wheel Pants Aluminum Dural Landing Gear Foam Wing Stabilizer Fin Rudder Clear Plastic Molded Canopy Special Hardware Full Size Rolled Plans Complete Instructions Sheeting 68 long U WingSpan 88 U Wing Area 1144 sq ins U Requires 4 Channel Radio 2 Aileron Servos U Flying Weight 16Y2 18 lbs U DESIGNED FOR QUADRA ENGINE Available favorite R/C dealer *REThMPAN 1ODEL MANUFACTU P0 BOX 2URBANANO S 61001 217/367-2069 C Control surface linkage order preference 1 Cable system push-pull pull-pull 2 Golden Rod Sullivan Push-pull 3 Arrow shaft fiberglass aluminum 1/4in 5/16-in OD 4 Hardwood dowel 3/8-in OD 5 Sig Carbon Rods D Hinges rated heavy duty manu factured Giant RC Aircraft use Home made original-design hinges acceptable determined adequate intended use E Clevis attachment hardware should heavy duty 4/40 thread rod type Rods 2/56 thread size acceptable applications Clevis have lock nuts keepers Section VIIFlight Testing De-Bugging man datory Giant-type RC Aircraft flown IMAA- AMA-sanctioned events must have flown flight tested flight trimmed minimum six 6 flights before such aircraft may safety checked entered fly Section VhfSafety Check mandatory Giant-type RC Aircraft flown IMAA-or AMA-sanctioned events must spected approved flight approved safety personnel event aircraft involved crash acident no matter minor air craft will have inspected Safety Officer once again approved flight providing aircraft repaired made ready additional flying same entered event Section IXProof Flight mandatory Must submitted IMAA- AMA-sanctioned events I Submission photographs showing aircraft flight 2 Signature builder/flier attesting fact Section XIAircraft Exceeding Max Size Regu lations mandatory Aircraft exceed wing loading 48 oz per sq ft 100 lb total may flown IMAA- AMA-sanctioned events under following conditions I Proof adequate insurance special poli cies etc 2 AMA FCC licenses required 3 Event sponsoring organization has purchased additional insurance covering pilot operator spectators minimum $1 million liabil ity coverage 4 Spectators shall assembled no less 100 ft flight line Section XIISafety Officer mandatory IMAA- AMA-sanctioned Giant Scale event shall have appointed Safety Officer turn will appoint Field Marshall addi tional Safety Committee members will responsible safety regulations pilot helpers spotters crowd control fire hazard precau tions smoking regulations pit pass control No prize being offered first person tell us Section X has omitted have deliberately kept IMAA numbering system avoid confusion receive comments second item concerning model aircraft size limits letter Kent Walters written One-Eighth Air Force stationary sent AMA President John Grigg understand entire letter has already published other model magazines conserve space we therefore re Continued page 117 14 Model Aviation Safety/Preston Continued page 14 printing entire letter However anyone desires receive copy SASE address end column will bring Basically what Kent suggesting weight limit around 90 lb multi-engine Scale models rationale permit modeling multi-engine aircraft same scale number popular 60- 90-powered singleengine models claims multi-engine bomber would have about six times weight single-engine fighter modeled same scale other words fighter weighs say 12 15 lb comparable bomber would come out about 72 90 lb letter states may ask make exception weight safety standpoint have seen aircraft flown example made above answer may easy Such aircraft fly relatively slowly very stable aerodynamicallyas would expected comparing performance its full-size counterpart type model also performs very little way serious aerobatic maneu vers reduces probability risk signifi cantly during flight start emphasizing engine displace ment limit such models instead present limiting weight have really placed signifi cant control kinetic energy achieved dur ing flight since aircraft above 55 lb would forced slower velocity attitude letter concludes following state ment Scale modeling community needs opportunity use 60- 90-size engines corresponding size weight airframe model four-engine aircraft achieve what Scale modeler striving fidelity scale nutshell seems should consider last paragraph ask ourselves ques tion Does Scale modeling community need use 60- 90-size engines multi-engine aircraft Bear mind unlike IMAA proposal Kent suggesting engine displacement limit increased last item regarding model size Coun cil referred AMA Safety Committee rules change proposal submitted Bill Nor throp Bills proposal Gen-84-9 published December 1982 issue MA page 114 would add another paragraph Section 4 Gen eral page 7 current rule book paragraph would state 43 Weight Limit Model aircraft weigh ing excess current maximum amount specified AMA competi tion category shall permitted fly AMA-sanctioned competitions AMA-insured activities AMA-in sured flying sites present time RC Giant Scale Section 53B page 83 rule book permits models up 40 lb weight maximum per mitted competition category So unless Giant Scale weight limit upped 55 lb conflict between Bills proposal Council-established weight limit Since no pro posal submitted increase Giant Scale weight limit Council has referred conflict Safety Committee resolution proper note AMA Safety Code weight-limit factor determines whether model covered AMA insurancenot competition rules comments receive address three items concerning maximum fiorndo PROPELLERS Made polyester boil color Go GRISH .the No 1 propeller True helical pitch airfoil win-power Sizes pitches styles needs AT YOUR DEALER 2 Blade Tractor 53each 5-45354ICc 6364SOc 747678SOc 8486687Db 949-69-7 9810410-6Nc 11411-611-8 1 12412-51264180 2 Blade Pusher 5, 3 5-4 6-36-4 SOc 8-6Nc 9-610-6*1 3 Blade Tractor 5-36364 SOc 3 Blade Pusher 6-3HOc Metalige Aluminum Color Tractor 7678 *1 8688$1 96 06104*150 Pusher106$1 GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes chance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 $7 6810 12 PITCH208 2210 24 13 IN 8 & 10 PITCH26$16 RIGHT HAND TRACTOR GRISH~HN INDIANA 46373 Way maintain nicads e ONLY $1 995 SIMPLE CYCLER pay another charger already own Cycle Rx Tx packs easy way throughout year SIMPLE CYCLER gives audible warning packs discharged level recommended manu facturer safely recharge radio systems charger can easily determine percentage power consumed remaining pack Simple sate cheap Connectors included #RED 22 See local hobby shop ucts made USA Send SASE full information CRam 4736 N Milwaukee Ave ago IL 60630 IF UNAVAILABLE LOCALLY ADD $100 FOR DIRECT ORDER NO COD **SAILPLANE**jam launching equipmentl UUI P40 CARD KIT hi-starts/winches/accessoriesFULL COLOR EXACT REPRODUCTION complete line/best prices/top qualityYt/4 sow $500 REM EMBER HOW send self-addressed stampedONLYWELL THEY FLEW envelope catalog/information -SpcII offr Inoludes roupon reusiring RL F PRODUCTS~ ~FIDo nd1 Te R3 Box 178-V Paoli IN 4745418121723-4310~Ak1UNIQUE NOSTALOIc OIFY model size will passed other members AMA Safety Committee suggest anyone wishing comment promptly column being written end October will see until December Pro con would like have input Have safe month John D Preston 7102 Elvira Ct Falls Church VA 22042 RC AerobaticsNan Putte Cont/nued page 43 other way youll end up balsa skin covered glass cloth toilet paper As toilet paper becomes soaked epoxy unroll turn two paper discard Continue rolling until toilet paper stops soaking up epoxy Look closely thejob did youll notice glass cloth securely stuck balsa skin foot two away becomes invisible can see balsa After allowing epoxy cure excess cloth can trimmed around edges balsa skin use water-soluble contact cement stick skin wing thats prefer ence Use whatever works you wrap skin around leading edge wing forget ammonia trick because glass cloth outside skin prevents crack ing Theres no magic just technique Next month plan cover perform Reverse Outside Loop Ron Van Putte 111 Sleepy Oaks Road Ft Walton Beach FL 32548 February 1983 117
Edition: Model Aviation - 1983/02
Page Numbers: 12, 14, 117
____first Sbnws WE THOUGHT controversy over maxi mum size model aircraft resolved AMA Executive Cbuncil voted adopt same 55 lb weight limit enforced Canada Australia ever have revised thoughts after attendance Councils October 23 1982 meeting agenda contained no less three items concerning maximum model aircraft size can sum marized follows I Aircraft Size Safety Guidelines sub mitted Council proposal adoption IMAA contain comprehensive guidelines construction operation Giant-sized model aircraft section wing loading sug gests maximum 48 oz sq ft maximum model weight 100 lbs whichever least 2 Letter One-Eighth Air Eorce written Kent Walters requests further study model weight limit consideration weight limit 90-lb range multi-engine models present 44 cu engine displacement limit 53B2 AMA rule book maintained 3 Rules change proposal Gen-84-9 submitted AMA Bill Northrop would establish 40 lbs weight limit model aircraft far majority readers have cor responded us subject maximum model weight regard current 55-lb limit too heasv Rationale consensus differs quite number stated believed Council acted haste should have based its decision something tangible Canadian weight limit also proponents higher weight-limit feel likewise little explained about reasoning 55-lb limit other apparently limit similarly imposed Canada MAAC co incided Eederal-imposed highway speed limit doubt Council based its deci sion latter limit Rather reopen discussion maxi mum model size within itself Council has turned over members AMA Safety Committee resolution committee will asked consider issues concerning model air craft size requirements report back Coun cil recommendation Since happen member Safety Committee would like solicit opinions readers Let said AMA makes snap decisions some dingy basement room Headquarters First look IMAA Safety Guidelines have formulated 1MAA Board Directors copy received form brochure introduction written IMAA President Don Godfrey IMAA seeking recognition special interest group within AMA structure since associa tion has over 3000 members appears logical should selected collective voice Giant-sized-model builder Don states following introduction guidelines IMAA presently working AMA formulate reasonable attitude towards Giant Scale safety regulation IMAA can viable asset AMA within structure IMAAs very own organization IMAA cannot satisfactorily reach proper conclusion problem who-shall-make-Giant Scale regu lations what degree IMAA will have no choice go independent following proposed guidelines understand will also printed next issue High Flight IMAAs quarterly newsletter IMAA Aircraft Size & Safety Guidelines Section Maximunt Wingspan Maximum al lowable wingspan gasoline-powered radio controlled aircraft shall exceed sixteen feet 16 ft 5 percent 5% override may allowa ble aircraft true nature scale dimensions exceed 16-ft span Section IlMaximum Wing Loading Maximum wtng loading shall exceed 48 ounces per square foot wing area hundred pounds 100 lb total aircraft weight whichever least Section III Alaximunt Engine Sizes Single-engine aircraft 46 Cu maximum Twin-engine aircraft 83 cu total Multi-engine aircraft 96 Cu total attempt exceed 12 pounds aircraft per cubic inch engine displacement ignition engines regardless size shall have onboard kill switches either servo-operated man ual glow engines used Giant RC aircrqft shall hase on-board system will stop engine radio command requirements mandator t Section VOn-Board Fuel Capacity minimum per engine 13 to 315 Cu 16 oz fuel tank 37 to 43 Cu 24 oz fuel tank Over 43 Cu engine 32 oz fuel tank Reserve fuel supplies eliminate deadstick land ings Section VRadio Equipment minimum require ment A To standard ECC-approved quality B Servos rated heavy duty min imum 24 inch-ounce thrust non-critical control functions minimum 45 inchounce stress functions use servo per aileron servo stabilizerleft / stabilizer-right strongly recommended Use dual servos recommended C Batteries on-board shall 1000 mAb up 20 lb 1200 mAh 30 lb l800 mAh 40 lb 2000 mAh over 40 lb D Redundant fail-safe battery systems recommended E The use anti-glitch devices long leads recommended Section VI Mechanical Components A Servo arms servo wheels rated heavy duty B Control horns rated heavy duty Continued page 14 12 Model Aviation Ji -/ 511 liii ThAT GUY UP5TAPS S BUILDIN THEM BG AEROTHNG5 AGAIN Now Great Planes World Aerobatic Giant Scale design CAP 21 Easy build easy fly Its latest design France U Heres perfect Giant Scale project winter Great Planes new Cap 21 Cap 21 easy build because incidence downthrust angles molded Plus Cap 21 features Great Planes precision machine cut sanded parts go together right first time new Cap 21 easy fly too dont let its good manners fool Cap 21 loves snap maneuvers its wide speed envelope Cap 21 has challenge enough satisfy seasoned veteran KIT INCLUDES Epoxy-Glass Fuselage Cowl Wheel Pants Aluminum Dural Landing Gear Foam Wing Stabilizer Fin Rudder Clear Plastic Molded Canopy Special Hardware Full Size Rolled Plans Complete Instructions Sheeting 68 long U WingSpan 88 U Wing Area 1144 sq ins U Requires 4 Channel Radio 2 Aileron Servos U Flying Weight 16Y2 18 lbs U DESIGNED FOR QUADRA ENGINE Available favorite R/C dealer *REThMPAN 1ODEL MANUFACTU P0 BOX 2URBANANO S 61001 217/367-2069 C Control surface linkage order preference 1 Cable system push-pull pull-pull 2 Golden Rod Sullivan Push-pull 3 Arrow shaft fiberglass aluminum 1/4in 5/16-in OD 4 Hardwood dowel 3/8-in OD 5 Sig Carbon Rods D Hinges rated heavy duty manu factured Giant RC Aircraft use Home made original-design hinges acceptable determined adequate intended use E Clevis attachment hardware should heavy duty 4/40 thread rod type Rods 2/56 thread size acceptable applications Clevis have lock nuts keepers Section VIIFlight Testing De-Bugging man datory Giant-type RC Aircraft flown IMAA- AMA-sanctioned events must have flown flight tested flight trimmed minimum six 6 flights before such aircraft may safety checked entered fly Section VhfSafety Check mandatory Giant-type RC Aircraft flown IMAA-or AMA-sanctioned events must spected approved flight approved safety personnel event aircraft involved crash acident no matter minor air craft will have inspected Safety Officer once again approved flight providing aircraft repaired made ready additional flying same entered event Section IXProof Flight mandatory Must submitted IMAA- AMA-sanctioned events I Submission photographs showing aircraft flight 2 Signature builder/flier attesting fact Section XIAircraft Exceeding Max Size Regu lations mandatory Aircraft exceed wing loading 48 oz per sq ft 100 lb total may flown IMAA- AMA-sanctioned events under following conditions I Proof adequate insurance special poli cies etc 2 AMA FCC licenses required 3 Event sponsoring organization has purchased additional insurance covering pilot operator spectators minimum $1 million liabil ity coverage 4 Spectators shall assembled no less 100 ft flight line Section XIISafety Officer mandatory IMAA- AMA-sanctioned Giant Scale event shall have appointed Safety Officer turn will appoint Field Marshall addi tional Safety Committee members will responsible safety regulations pilot helpers spotters crowd control fire hazard precau tions smoking regulations pit pass control No prize being offered first person tell us Section X has omitted have deliberately kept IMAA numbering system avoid confusion receive comments second item concerning model aircraft size limits letter Kent Walters written One-Eighth Air Force stationary sent AMA President John Grigg understand entire letter has already published other model magazines conserve space we therefore re Continued page 117 14 Model Aviation Safety/Preston Continued page 14 printing entire letter However anyone desires receive copy SASE address end column will bring Basically what Kent suggesting weight limit around 90 lb multi-engine Scale models rationale permit modeling multi-engine aircraft same scale number popular 60- 90-powered singleengine models claims multi-engine bomber would have about six times weight single-engine fighter modeled same scale other words fighter weighs say 12 15 lb comparable bomber would come out about 72 90 lb letter states may ask make exception weight safety standpoint have seen aircraft flown example made above answer may easy Such aircraft fly relatively slowly very stable aerodynamicallyas would expected comparing performance its full-size counterpart type model also performs very little way serious aerobatic maneu vers reduces probability risk signifi cantly during flight start emphasizing engine displace ment limit such models instead present limiting weight have really placed signifi cant control kinetic energy achieved dur ing flight since aircraft above 55 lb would forced slower velocity attitude letter concludes following state ment Scale modeling community needs opportunity use 60- 90-size engines corresponding size weight airframe model four-engine aircraft achieve what Scale modeler striving fidelity scale nutshell seems should consider last paragraph ask ourselves ques tion Does Scale modeling community need use 60- 90-size engines multi-engine aircraft Bear mind unlike IMAA proposal Kent suggesting engine displacement limit increased last item regarding model size Coun cil referred AMA Safety Committee rules change proposal submitted Bill Nor throp Bills proposal Gen-84-9 published December 1982 issue MA page 114 would add another paragraph Section 4 Gen eral page 7 current rule book paragraph would state 43 Weight Limit Model aircraft weigh ing excess current maximum amount specified AMA competi tion category shall permitted fly AMA-sanctioned competitions AMA-insured activities AMA-in sured flying sites present time RC Giant Scale Section 53B page 83 rule book permits models up 40 lb weight maximum per mitted competition category So unless Giant Scale weight limit upped 55 lb conflict between Bills proposal Council-established weight limit Since no pro posal submitted increase Giant Scale weight limit Council has referred conflict Safety Committee resolution proper note AMA Safety Code weight-limit factor determines whether model covered AMA insurancenot competition rules comments receive address three items concerning maximum fiorndo PROPELLERS Made polyester boil color Go GRISH .the No 1 propeller True helical pitch airfoil win-power Sizes pitches styles needs AT YOUR DEALER 2 Blade Tractor 53each 5-45354ICc 6364SOc 747678SOc 8486687Db 949-69-7 9810410-6Nc 11411-611-8 1 12412-51264180 2 Blade Pusher 5, 3 5-4 6-36-4 SOc 8-6Nc 9-610-6*1 3 Blade Tractor 5-36364 SOc 3 Blade Pusher 6-3HOc Metalige Aluminum Color Tractor 7678 *1 8688$1 96 06104*150 Pusher106$1 GRISH LARGE WOOD PROPELLERS HARDWOOD too hard minimizes chance costly plane engine damage True pitch airfoil fully finished balanced ready coating 3/8 BOREALL SIZES IN18 $7 6810 12 PITCH208 2210 24 13 IN 8 & 10 PITCH26$16 RIGHT HAND TRACTOR GRISH~HN INDIANA 46373 Way maintain nicads e ONLY $1 995 SIMPLE CYCLER pay another charger already own Cycle Rx Tx packs easy way throughout year SIMPLE CYCLER gives audible warning packs discharged level recommended manu facturer safely recharge radio systems charger can easily determine percentage power consumed remaining pack Simple sate cheap Connectors included #RED 22 See local hobby shop ucts made USA Send SASE full information CRam 4736 N Milwaukee Ave ago IL 60630 IF UNAVAILABLE LOCALLY ADD $100 FOR DIRECT ORDER NO COD **SAILPLANE**jam launching equipmentl UUI P40 CARD KIT hi-starts/winches/accessoriesFULL COLOR EXACT REPRODUCTION complete line/best prices/top qualityYt/4 sow $500 REM EMBER HOW send self-addressed stampedONLYWELL THEY FLEW envelope catalog/information -SpcII offr Inoludes roupon reusiring RL F PRODUCTS~ ~FIDo nd1 Te R3 Box 178-V Paoli IN 4745418121723-4310~Ak1UNIQUE NOSTALOIc OIFY model size will passed other members AMA Safety Committee suggest anyone wishing comment promptly column being written end October will see until December Pro con would like have input Have safe month John D Preston 7102 Elvira Ct Falls Church VA 22042 RC AerobaticsNan Putte Cont/nued page 43 other way youll end up balsa skin covered glass cloth toilet paper As toilet paper becomes soaked epoxy unroll turn two paper discard Continue rolling until toilet paper stops soaking up epoxy Look closely thejob did youll notice glass cloth securely stuck balsa skin foot two away becomes invisible can see balsa After allowing epoxy cure excess cloth can trimmed around edges balsa skin use water-soluble contact cement stick skin wing thats prefer ence Use whatever works you wrap skin around leading edge wing forget ammonia trick because glass cloth outside skin prevents crack ing Theres no magic just technique Next month plan cover perform Reverse Outside Loop Ron Van Putte 111 Sleepy Oaks Road Ft Walton Beach FL 32548 February 1983 117