Safety Comes First

E-Z push rod con nec tors revisited Balsa pushrod cautions Soft engine mount alert Zenoah G-38 muffler fix Friction starts fires Runway barrier available E-Z CONNECTORS March 1989 Saf ety column discussed letter Alan Pinkstaff related experience club safety officer alleged E-Z connectors safe use flight control functions discussion sparked readers send quite flood letters some discussed June Safety column col umn turn reopened floodgates once filled mailbox letters concerning E Z connectors Some missives related problems experienced modelers used others endorsed use control functions several offered suggestions pre vent problems common fixes suggested readers replace slotted-head straight-blade screwdriver setscrew socket-head cap screw Allen screw As stated letter Canadian modeler Ron Simonson socket-head cap screws hardened can get better bite wire pushrod can also apply torque Allen wrench screwdriver Rons letter also mentioned some newer E-Z connectors come equipped socket-head cap screws Well appears Jim Broberg someone else Du-Bro must read column because some samples newer Du-Bro Heavy Duty E-Z Connectors arrived mail just last week supplied 4-40 socket-head cap screw lock pushrod wire Du-Bro also has version Catalog #490 secured servo arm means steel push nut instructions state cannot removed once is place No Im taking credit new products although aware existence time wrote column June issue Two readers FJ Charavay Lee Bern hardt both submitted same solution pre vent pushrod slipping old-style screwdriver setscrew E-Z connectors run 2-56 tap through pushrod hole connec tor use threaded pushrod threaded coupler using flex cable pushrod Lee uses Loctite prevent rotation pushrod wouldnt necessary rotation pre vented other end pushrod such Z-bend connection clevis soldered place Balsa pushrods discussion E-Z connec 14 Model Aviation tors June column also mentioned two readers Chuck Spencer Milton Peacock both opposed use balsawood pushrods asked comments other modelers Clyde Brothers reported two failures A-in sq balsawood pushrod oc curred Eagle 63 both cases models constructed inexperienced modelers flown about year subjected numerous poor landings failures occurred because elevator pushrod wore away crossed side fuselage other rubbing rud der pushrod other words failures proba bly would have occurred pushrods correctly installed eg rudder pushrod exits left side fuselage rudder servo should installed left elevator servo Another letter Tom McNulty stated feels balsawood pushrods OK 40-size smaller models However Tom mentioned purchased two kits A-in-sq balsa supplied pushrods just too soft and/or knots As courtesy local hobby store owner replaced denser wood Tom also suggests spection balsa pushrods after kind dork models configuration such pushrods cannot removed inspec tion suggests using some other type pushrod material first place Tom also mentioned experienced prob lem somewhat similar reported Dave Gilbert also June column con cerned self-starting Sullivan starter case Tom reaching field box starter fingers brushed strip switch sembly very lightly caused starter energize pinch finger between drive cone motor case Toms theory ex tremes temperature may affect switch starter exposed full sunlight day temperature around 1000 F opposite Dave Gilberts situation cold condition may have reason starter self-started Tall tales previous write-up selfstarting starter another similar incident involved onboard starter self-starting stated latter sounded like tall tale state ment prompted Chuck Spencer write sec ond Dear John letter three months Chuck person originally reported onboard starter incident after personally ob served damage caused recall incident models engine actually started itself middle night Anyway Chuck also another tall tale apparently reported RCM back Six ties docsnt have direct bearing safety thought might get chuckle out Another happening may considered tall tale obnoxious German shepherd dog resided across road early RC flying fields incident reported friend Bob Bailey time ground-based transmitters large batteries state art airplane controlled keying button Continued page 16 John Preston Safety812 Comes Pint Northampton St NW Washington DC 20015 column provided address items concern regarding safety aspects model aviation activities Content column however opinion author does necessarily repsent official position Academy Model Aeronautics A-\ .11JA lb SCALE Wing Span65 Wing Area714 sq Weight7-8 bs Engine61 2c 90 4c MADE IN THE USA Receive FREE cockpit kit PICA standoff scale model purchased between July 1 1989 September 30 1989 sending proof-of-purchase PICA postmarked no later October 31 1989 Proof-of-purchase end label kit box original bill sale will no exceptions dates offer bill sale must clearly show dealers name address Void prohibited law coupon must accompany request MODEL 5CALE SIZE CITY STATE ZIP PICA ENTERPRISES INC NE 188th STREET IFLORIDA 33180 0 305 935-1436 Carry Largest Only Stock Kratt Parts Wee-Id aft alive working KRAFT MIDWEST ILLFLIA Authorized Warranty Service FREOUENCY CONVERSION $1000 Discount Regular Repair Most Makes Models Converted Tuning Done Spectrum Analyzer K- LINE Also Service AU rn/C FutabatrShad Only Full Time Servicenter Midwest 115 East Main St Northvil le Michigan 48167 [upper Level //Sq7 Phone 1-313-348-0085 cord attached transmitter think air plane involved Sterling Monocoupe pow ered Fox 35 recall large model small engine lost inside cowl Anyway canine involved making nuisance himself among fliers after sniffing transmitter suddenly lifted leg same literally received shock life went howling back across road need less say no trouble him last word Chuck believes folly use balsa pushrods Hc says Balsa pushrods might alright Old-Timer May Safety column reprinted letter Fred McClellan described lost model after wing dowel burned away due frictional heating Another tall tale say Well after reading Brian Malloy modeler Florissant MO wrote informed similar experience After reading May 89 column thought might like hear about experi ence wing dowel fire Although expe rience wasnt quite dramatic column thought might like know phenomenon unique taken Spickler Quickee 500 out its maiden flight installed wooden prop Enya 40 mistakenly assumed bal anced prop second flight engine started sound funny became very loud dropped down low flyby see could detect problem What saw muffler hanging its pressure line Continued page 18 16 Model Aviation SCALE Wing Span88/ Wing Area1270 sq Weight12-14 lbs Engine90-18 2c 12-20 4C CONTACT YOUR LOCAL DEALER SPITFIRE Mk IX FREE COCKPIT KIT MA NAME ADDRESS fl3~ Box 1063 Lorain Ohio 44055 EVE EFW Phnna 218 282-8354 PEANUT SCALE Piper Vagabond Piper Cub Stinson 125 Outdoor kits each. 8750 Light Indoor kits OUTDOOR PEANUT Super Scale 0 NEW Micro X Hornet P30. 51395 SPORT SCALE PC-6 Porter Taylor Craft Stinson Voyager Rubber C0 Power Kits each. 8850 SPORT MODELS An Embryo Model 18 Span designed WInI beginners experts. 8850 HARD-TO-FIND ITEMS Early Bird Tissue Antique Aircraft$598 True Olde Japanese Tissue 10 3 colors$896 Japanese Tissue 12 6 colors8396 Microlite Silver8398 Microfilm- $498 Glue $175 Solvent- $150 Plan Service over 17 Scale Sport Scale ft Peanut Scale Rubber Strip 020 thru 085 each 8198 3/32 thru 5/32each 8250 winder 61 Mark 1161 6 Complete Line Brown CO2 Motors BaIss Wood Outdoor ft Indoor Sheets ft Strips Add 10% Postage ostage 8180 COMPLETE CATALOG DESIGNS SPECIFICATIONS Engine size40-50 2 cycle Radio4-5 channel Wing615 sq Weight45 5 lbs Over two years design development have gone WEASEL YOU mind detailed easy understand instructions make WEASEL quick build fun fly Advanced Sport Pattern flyers will appreciate excellent flying characteristics ability customize airframe suit eye need WEASEL can pour power tear up sky pull back cruise afternoon away Terms us currency accept Mastercard Visa COD $300 PP $450 $350 handling Ohio Residents add 6% sales tax Designed Engineered RC Designs 75 Price Dr Wilmington Ohio 45177 382-2158 Business Hours 4 pm 8 pm Weekdays/12 6 pm Saturdays /Sundays chance Expires September 1989 beating against side fuselage vibra tion unbalanced prop backed mufflers securing screws completely out Before next flying session replaced muffler screws installed lock washers balanced prop checked other connections screws conclusion days flying amazed discover wing dowel burned almost half Inspection receiving hole fuselage former also showed heavy charring damage side dowel portion towards bottom aircraft epoxied appropriately sized piece copper tube over damaged portion dowel redrilled receiving hole accommo date tubing hardened thin CyA glue have further problems connection Since did think inspect wing dowel after first flight Im sure dam age caused entirely during running time unbalanced prop Perhaps some damage sustained during run exacer bated normal vibration balanced prop/engine succeeding two flights case guess rubbing two sticks together 16000 strokes minute may cause smoke worse Soft engine mounts may have noticed crease number advertisements modeling press vibration-dampening engine mountscommonly known soft mounts As learned previous letter vibration unbalanced prop can have interesting results balance prop singlecylinder engine will transmit significant vibration airframe doesnt cause dam age has shown add apreciably Continued page 20 1flO Y01 1 YOUR CAP SAYS IT ALL! CLUB LOGO AND MEMBERS NAME AS LOW AS $595 Show off club logo personalized club caps can add members title under name such President VP Instructor no addi tional charge CAP COLORS INK COLORS WNIPiW Eli IEIIEAI BIkCI-IIl J~JTLIUE kEllTIO-IOk CAP PRICES 1-9 $1095 10-24 $895 25-49 $795 50-74 $695 OVER 75 $595 NY REaIOENTa ADO aALE% TAX Just send us clean B/W copy club logo members names title desired wilt specified cop ink colors Any questions please call SANDY NEUMAN PC BOX 1 003 fhLVIEL NY I 77 516 293-5835 18 Model Aviation RC pleased introduce THE WEASEL Customizable monoplane Introductory offer Kit Price$9695 $8695 F ND GIANTS FOR GIANT SCALE BUFFS JN4 Jenny $27 815H Monqoino Rb $42 okke 07 FIn $390 10959 MoqoBonb $35 70 Boylo OenBoe $32 98 5eon PTI7Koydol $56 60 Honno 4 Pe Roon 533-OH N81k Wdooo P61 $69 60 Sop onorine S68 $24 71 Doog DC3 C471 $35 89 Soperononin 56B 535 95 Song $C3 C47 $55 63 Coot ifonnin P-6R $42 86 Hosoko Toonco 13 552 94 C~n Hoonk P6E $56 64 Slon Sky-Con518 74 Doolittln 0811 54$ 72 Coo5251 /4 t&$ $46 95 Mononoopo 5ponl $36 158 Con 03U1/4 L&5 $5685 Ho11 Spr Boildog $43n- 60 Dooglo M2 Moil $24 107 Aeonoo C-3 Spn $35 68 Britol Rolidog FIn $30 62 Honnod Roce Ike $451 59 BononRoce MtA 554 78 Troen WW Ron 035 107 Onorn Reonol P8P $54 63 Con Oohk Fl IC $42 69 Ljndknog NO211 $28 94 Coo Conink FliC824 91 tndbeog NX21 1 $39 66 Delion Coool Roo$24 96 WoNWINov Ron $48 62 HoooMnAAoiSgon$35 74 C Helidno 592C4 025 94 HoonMoMolOgon$45 108 PoiooiPT19 Tn $59 83 Booing P26A Fin836 65Wooo Topon-Wing $36 84 Booing P36A FIn548 95 Wono ToporWing $48 69 Wono C6 Cobb $36 75 WeolId Lyondeo $32 78 Otog $38 150 Wn.Id Lyonde $49 Pond Toinnin 4AT $36 ond Trirol 4AT $48 82 Look 11 Oleolno 84$ 114 62 Olinon 7/W 087 $18 968 $1 011000 T/W 087 $26 93 122 Olinson 71W 087 $38 38 59 BnoloI FIn P28 $30 780 118 Bnitol FIr P28 $4S 124_ 74740, Peoo $45- 65 look Eopoe. oo Woniok P40 834 83 Look Al Rnpne. $26 o8l Conoio 945 $35 77 WWn, 121 RedL $48 80 VogI Coooio P45 $89 63 C Onolonok F7C 1 $45 78 Look LIgklng P38 $38 94 C Oeoionnk F7C 1 $57 56 RopOeo8en An $24 1585k0 028 Annpk $49 74 8epSeo8ee Ann $39 60 Roe og 105 Sport $36 70 Pipen J3 Cob $29 90 Bon no iso spool $49 106 Piper J3 Cob$397 72 Northrop Gonnono $48- 98 Look iiodon 8nk $38 96 Noolhnop Oon,oo $75 4 63 Goon F6F Helinol 528 95 SlinnA Loon 2/14 $56 77 8oeiog 8170 P01 535 60 OlincA Loon 3 /M 842 8o. 8170 Pool $55 130 SIn too 3 14 $82 68 Wnti Whininoind $32 78 Coneol Con PEYSA 042 68 N Anne Nonion $39 104 Con Cot 98Y SA $56 Bononoo VToii $39 65 M Ci no CI opon 065 77 Loenoonke Se4nn $25 97 MCi Ci pper $75 73 NA 825 Bonoken $49 62 Co te NC 4 059 65 MMooooder 826 $49 94 Cort ne NC 4 $69 flUe ores 000ES OnOEtER SIZE Gone 5000 H 5o14 Thin $eoiers Pobno,ok1enl 10 ohonge nen 1400 Morn SOn 59 6134 P09 Alonoy toni Add 10% no nil node, inipp 08 & OS etn $SA Con & Mno EieonReoe II 15% i25% 9 onigi notolog $200 linniodon Pnino Lit Polon i,t* eotion oiooo 51 00 obo foneigo odd $100 LE VELAND MODEL & SUPPLY Co 18387B DETROIT AVE CLBV8LAN$ OHIO U182 nnonnnoneObOOOOrO bone S1SPME ST i0o 0STH3161 9613600 nooe.nrenoonooo Over 237 cowls kit scratch built models Also over 34 round cowls ranging 4 14-7/8 diameter 55 diff size 8 shape wheel pants custom Make Parts Vacuum Form Canopies Pie. mmd $1 ferceplgteht Tin FIENSLASS SPECIALTIES 38824 Mt Kisco Dr. Sterling Hgts MI 48310 PHONE 313 421-8358 hAZED & HEAT-lUAIID WIE GEARS & CUANE PHONE 313 261-9064 bonded engine-mounting studs am aware least two cases such soft mount failed failure occurred after about two minutes running time Don Lowes column Flying Lowe May 1989 issue RCM illustrates system has successfully used 37 cu engine also number other soft-mount de signs vibration-absorbing rubber compression such marketed G&A Products samples recently appeared mailbox design would subject engine separation since has no bonded metal/ rubber components just too model magazines market have subscription So possible article comparing effec tiveness different brands soft mounts re ducing vibration transmitted airframe has already appeared would well worthwhile project somebody access necessary vibration-measuring equipment undertake Runway barrier couple years ago col umn carried photographs RC club flying field used tennis nets along near edge runway prevent out-of-control models entering pit/spectator area sample another product can used model aircraft barrier arrived AMA HeadContinued page 22 Duracraft IflC / 1007 Orchard Grove Dnve Roysi Oak Ml 48067 DuraPlane IlThe trainer rugged enough teach entire club fly Tell hobby shop owner want see toughest model aiplane money can buy IteM csau NO IurAsa products Inc Only certified checks money orders accepted Minimum order 11200 three packages 4 Powerpof eN $350 per package $150 shipping handling CT residents add 15% sales las Prices sabjact change sohce DEALER INQuIRIES INVITED lunthe infornutiOn dealer prices send SASE Business Card SERMOS RIC SNAP CONNECTORS Calar Cm Staten Box 16767 Stanifrrd CT C6 203322-6294 20 Model Aviation noise generated models al ready using soft-mounted engine suggest FIBERGLASS PARTS consider next project However before you might consider word caution relates safety planning use engine having over 061 cu displacement rely solely soft mount rubber cylinder features Performance Blended Fuels \.ORIGINALSINiTHigher Performance ther Running Superior Lubrication ualled Rust Protection SEE YOUR doesnt stock Byron Originals Fuels order direct FREE FREIGHT ii Overseas call shipping quote RETAIL PER GAL ORDER NONITRO CASE Synthetic/CastorBlends 31300040%Prer 31300055%Byrt 31300065%Prer 31300088%Prer 313001010%Byrc 313001110%Prem 313001210%4Cyclc 313001310%Helicop 313001615%Premiurr 313001715%4CycIe 313001815%Helicont 3 13002020%Byro 313002525%Premium 313003535%Premium C 313004545%Premium C 313006060%Premium Cc Straight Synthetic 21200040%Premium F 21200055%Byro-Jet Str 21200065%Premium Spu 212001010%Byro-Jet Strai 212001110%PremiumSporc 212001515%Premium Sport 212002020%Byro-Jec Straig 212002525%Premium Compc 212003535%Premium Compc 212004545%Premium Cop" Minimum Order Quantity--i Byron Originals Inc ox Performance Hobbies Helicopter Specialist Stainless Steel Bearing Kit Shuttles $5995 Performance Turnbuckle Kits a Hastle Free Adluslment b No Ball Link Plyers Needed C Comes Complete Adjustment Wrench Most kits Start at 1295 Best Price Around Complete Test Flown Shuttle Packages Slop Hovering Aroundi Call & Order Today 206 939-4000 z PERFORMANCE HOBBIES 711 Auburn Wuy N 0 Auburn WA 98002 quarters last month havent seen yet telephone conversation AMA Technical Di rector Bob Underwood appears similar bright orange plastic mesh safety fences frequently see around construction sites Bob forwarded letter its distributor Twin Ridge Industries Inc contained specifications safety barrier fabri cated high-density polyethylene has enor mous strength two feet high comes rolls 50 100 ft supplied 42-in hardwood stakes five-foot centers ex pected cost around $1 per foot clubs interested Jerry Juskowich General Sales Manager can reached 1-412/5392307 Fireproof model letter Warren Spur geon Santa Barbara CA contained some com ments suggestions prevent onboard fire reported June Safety col umn result muffler Zenoah G-38 coming loose answer G-38 owners changing Tatone JTec muffler have flying Bridi Rearwin Speedster three years have problems muffler bolts coming loose after 20 25 flights have used socket-head Allen bolts Loctite still works loose take apart muffler comes 6-38 engine will see has two spac ers keep two pieces collapsing cinch down bolts Tatone JTec mufflers have spacers So no matter much tighten bolts expansion will warp muffler casing cause bolts loosen remedy can cut two spacers Continued page 131 22 Model Aviation FACTORY PRICE PER GAL CASE OF 4 1-4 CASES 5 CASES & UP $ 640 750 750 810 850 850 850 850 1015 1015 1015 1175 1335 1650 1965 2230 S 640 750 wIth 364-it BLUES CA getting down get protected CA mask Safety Plus mask will eliminate CA fumes epoxy polyester resin vapors air breath Lightweight easy breathing comfortable CA Mask $15a95 Paint Mask $2045 See hobby dealer first doesnt have what need order direct Safety Plus PO Box 1173 Dept 12M Clinton Mississippi 39056 Call toll free 1-800-842-7233 Mississippi dial 601-924-%40 VISA MASTERCARD accepted COD add $250 shipping handling included Dealer Inquiries Invited PLU5 Worlds Largest Range Fiberglass Carbon Fiber Props Sizes 1 12A Quarter Scale 2 3 4 Blades 0 Increased Availability 1989 Send SASE Information TOM DIXON 1938 Peachtree Suite 401 Atlanta GA 30309 Letters Editor Continued page 11 Ni-Cds dont seem affected cold anything like alkaline cells Once problem corrected lit tle Nickle flew flawlessly greatest small three-channel airplanes have ever flown James Harris Marion OH Safety/Preston Continued page 22 fit inside muffler between bolt holes will stop two halves warping have done three G-38s havent problems mufflers coming loose Now respect firewall fire picture column builders Giant aircraft would use engine mounts made engines flat plates come would have air gap behind muffler cool ing gasoline engines run hot dont think put hand hot muffler like did five years ago Thanks have taken time write describe mishaps Without letters would no Safety column wish another safe month Sweepee/DhaII Continued page 37 wont take off until its ready airplanes slow speed flying characteristics indicated also peculiar com ing out near hover increase throttle gradually ease off elevator stick using little down control get some extra speed Try maneuvers safe al titudes beginning youre getting used airplanes foibles might also find need get acquainted its strange appearance air before attempt ing anything too fancy color scheme clearly distinguishes front plane back should come handy low throttle condition flight charac teristics model similar sport airplane until force high angle attack slow speeds gradually increas ing up control seems have little effect airplanes attitudebut does bring model virtual halt point sink rate will high probably will have keep rudder control active keep course However plane shows relatively little tendency stall out condition Im still exploring full range SAFE FLYING IS NO ACCIDENT airplanes flight characteristics Join search Discover Sweepee yourselfand happy backward flying Radio Technique/Myers Continued page 41 must wary transmitters 910 MHz 455 channels away Such transmitters MRS/PRS transmitters find strong signals S SlO5 115 125 135 145 565 575 585 595 605 have consider potential interferences xx5 shorthand code PRS channel 10 kHz above RC channel number given Channel 105 0 MHz Image example strong signal S und 72040 PRS 125 may interfere 5C455 receiver channel 125 RC58 summary find something scan ner note its frequency some mathemat ics see what found might problem Lesson #6 much stuff really inter ference looking signal 72xxx MHz has strength 55 nd can expect signal adjacent channel problem wideband receivers air Expert opinion says 55 al should investigated Try find Out what causing Wet insulators high-tension line might cause condition often clears up after sun burns off morning dew An S ignal should always answered ground range check before flight EVEN Continued page 134 August 1989 131 responding advertisers mention read about ModelAviation I

E-Z push rod con nec tors revisited Balsa pushrod cautions Soft engine mount alert Zenoah G-38 muffler fix Friction starts fires Runway barrier available E-Z CONNECTORS March 1989 Saf ety column discussed letter Alan Pinkstaff related experience club safety officer alleged E-Z connectors safe use flight control functions discussion sparked readers send quite flood letters some discussed June Safety column col umn turn reopened floodgates once filled mailbox letters concerning E Z connectors Some missives related problems experienced modelers used others endorsed use control functions several offered suggestions pre vent problems common fixes suggested readers replace slotted-head straight-blade screwdriver setscrew socket-head cap screw Allen screw As stated letter Canadian modeler Ron Simonson socket-head cap screws hardened can get better bite wire pushrod can also apply torque Allen wrench screwdriver Rons letter also mentioned some newer E-Z connectors come equipped socket-head cap screws Well appears Jim Broberg someone else Du-Bro must read column because some samples newer Du-Bro Heavy Duty E-Z Connectors arrived mail just last week supplied 4-40 socket-head cap screw lock pushrod wire Du-Bro also has version Catalog #490 secured servo arm means steel push nut instructions state cannot removed once is place No Im taking credit new products although aware existence time wrote column June issue Two readers FJ Charavay Lee Bern hardt both submitted same solution pre vent pushrod slipping old-style screwdriver setscrew E-Z connectors run 2-56 tap through pushrod hole connec tor use threaded pushrod threaded coupler using flex cable pushrod Lee uses Loctite prevent rotation pushrod wouldnt necessary rotation pre vented other end pushrod such Z-bend connection clevis soldered place Balsa pushrods discussion E-Z connec 14 Model Aviation tors June column also mentioned two readers Chuck Spencer Milton Peacock both opposed use balsawood pushrods asked comments other modelers Clyde Brothers reported two failures A-in sq balsawood pushrod oc curred Eagle 63 both cases models constructed inexperienced modelers flown about year subjected numerous poor landings failures occurred because elevator pushrod wore away crossed side fuselage other rubbing rud der pushrod other words failures proba bly would have occurred pushrods correctly installed eg rudder pushrod exits left side fuselage rudder servo should installed left elevator servo Another letter Tom McNulty stated feels balsawood pushrods OK 40-size smaller models However Tom mentioned purchased two kits A-in-sq balsa supplied pushrods just too soft and/or knots As courtesy local hobby store owner replaced denser wood Tom also suggests spection balsa pushrods after kind dork models configuration such pushrods cannot removed inspec tion suggests using some other type pushrod material first place Tom also mentioned experienced prob lem somewhat similar reported Dave Gilbert also June column con cerned self-starting Sullivan starter case Tom reaching field box starter fingers brushed strip switch sembly very lightly caused starter energize pinch finger between drive cone motor case Toms theory ex tremes temperature may affect switch starter exposed full sunlight day temperature around 1000 F opposite Dave Gilberts situation cold condition may have reason starter self-started Tall tales previous write-up selfstarting starter another similar incident involved onboard starter self-starting stated latter sounded like tall tale state ment prompted Chuck Spencer write sec ond Dear John letter three months Chuck person originally reported onboard starter incident after personally ob served damage caused recall incident models engine actually started itself middle night Anyway Chuck also another tall tale apparently reported RCM back Six ties docsnt have direct bearing safety thought might get chuckle out Another happening may considered tall tale obnoxious German shepherd dog resided across road early RC flying fields incident reported friend Bob Bailey time ground-based transmitters large batteries state art airplane controlled keying button Continued page 16 John Preston Safety812 Comes Pint Northampton St NW Washington DC 20015 column provided address items concern regarding safety aspects model aviation activities Content column however opinion author does necessarily repsent official position Academy Model Aeronautics A-\ .11JA lb SCALE Wing Span65 Wing Area714 sq Weight7-8 bs Engine61 2c 90 4c MADE IN THE USA Receive FREE cockpit kit PICA standoff scale model purchased between July 1 1989 September 30 1989 sending proof-of-purchase PICA postmarked no later October 31 1989 Proof-of-purchase end label kit box original bill sale will no exceptions dates offer bill sale must clearly show dealers name address Void prohibited law coupon must accompany request MODEL 5CALE SIZE CITY STATE ZIP PICA ENTERPRISES INC NE 188th STREET IFLORIDA 33180 0 305 935-1436 Carry Largest Only Stock Kratt Parts Wee-Id aft alive working KRAFT MIDWEST ILLFLIA Authorized Warranty Service FREOUENCY CONVERSION $1000 Discount Regular Repair Most Makes Models Converted Tuning Done Spectrum Analyzer K- LINE Also Service AU rn/C FutabatrShad Only Full Time Servicenter Midwest 115 East Main St Northvil le Michigan 48167 [upper Level //Sq7 Phone 1-313-348-0085 cord attached transmitter think air plane involved Sterling Monocoupe pow ered Fox 35 recall large model small engine lost inside cowl Anyway canine involved making nuisance himself among fliers after sniffing transmitter suddenly lifted leg same literally received shock life went howling back across road need less say no trouble him last word Chuck believes folly use balsa pushrods Hc says Balsa pushrods might alright Old-Timer May Safety column reprinted letter Fred McClellan described lost model after wing dowel burned away due frictional heating Another tall tale say Well after reading Brian Malloy modeler Florissant MO wrote informed similar experience After reading May 89 column thought might like hear about experi ence wing dowel fire Although expe rience wasnt quite dramatic column thought might like know phenomenon unique taken Spickler Quickee 500 out its maiden flight installed wooden prop Enya 40 mistakenly assumed bal anced prop second flight engine started sound funny became very loud dropped down low flyby see could detect problem What saw muffler hanging its pressure line Continued page 18 16 Model Aviation SCALE Wing Span88/ Wing Area1270 sq Weight12-14 lbs Engine90-18 2c 12-20 4C CONTACT YOUR LOCAL DEALER SPITFIRE Mk IX FREE COCKPIT KIT MA NAME ADDRESS fl3~ Box 1063 Lorain Ohio 44055 EVE EFW Phnna 218 282-8354 PEANUT SCALE Piper Vagabond Piper Cub Stinson 125 Outdoor kits each. 8750 Light Indoor kits OUTDOOR PEANUT Super Scale 0 NEW Micro X Hornet P30. 51395 SPORT SCALE PC-6 Porter Taylor Craft Stinson Voyager Rubber C0 Power Kits each. 8850 SPORT MODELS An Embryo Model 18 Span designed WInI beginners experts. 8850 HARD-TO-FIND ITEMS Early Bird Tissue Antique Aircraft$598 True Olde Japanese Tissue 10 3 colors$896 Japanese Tissue 12 6 colors8396 Microlite Silver8398 Microfilm- $498 Glue $175 Solvent- $150 Plan Service over 17 Scale Sport Scale ft Peanut Scale Rubber Strip 020 thru 085 each 8198 3/32 thru 5/32each 8250 winder 61 Mark 1161 6 Complete Line Brown CO2 Motors BaIss Wood Outdoor ft Indoor Sheets ft Strips Add 10% Postage ostage 8180 COMPLETE CATALOG DESIGNS SPECIFICATIONS Engine size40-50 2 cycle Radio4-5 channel Wing615 sq Weight45 5 lbs Over two years design development have gone WEASEL YOU mind detailed easy understand instructions make WEASEL quick build fun fly Advanced Sport Pattern flyers will appreciate excellent flying characteristics ability customize airframe suit eye need WEASEL can pour power tear up sky pull back cruise afternoon away Terms us currency accept Mastercard Visa COD $300 PP $450 $350 handling Ohio Residents add 6% sales tax Designed Engineered RC Designs 75 Price Dr Wilmington Ohio 45177 382-2158 Business Hours 4 pm 8 pm Weekdays/12 6 pm Saturdays /Sundays chance Expires September 1989 beating against side fuselage vibra tion unbalanced prop backed mufflers securing screws completely out Before next flying session replaced muffler screws installed lock washers balanced prop checked other connections screws conclusion days flying amazed discover wing dowel burned almost half Inspection receiving hole fuselage former also showed heavy charring damage side dowel portion towards bottom aircraft epoxied appropriately sized piece copper tube over damaged portion dowel redrilled receiving hole accommo date tubing hardened thin CyA glue have further problems connection Since did think inspect wing dowel after first flight Im sure dam age caused entirely during running time unbalanced prop Perhaps some damage sustained during run exacer bated normal vibration balanced prop/engine succeeding two flights case guess rubbing two sticks together 16000 strokes minute may cause smoke worse Soft engine mounts may have noticed crease number advertisements modeling press vibration-dampening engine mountscommonly known soft mounts As learned previous letter vibration unbalanced prop can have interesting results balance prop singlecylinder engine will transmit significant vibration airframe doesnt cause dam age has shown add apreciably Continued page 20 1flO Y01 1 YOUR CAP SAYS IT ALL! CLUB LOGO AND MEMBERS NAME AS LOW AS $595 Show off club logo personalized club caps can add members title under name such President VP Instructor no addi tional charge CAP COLORS INK COLORS WNIPiW Eli IEIIEAI BIkCI-IIl J~JTLIUE kEllTIO-IOk CAP PRICES 1-9 $1095 10-24 $895 25-49 $795 50-74 $695 OVER 75 $595 NY REaIOENTa ADO aALE% TAX Just send us clean B/W copy club logo members names title desired wilt specified cop ink colors Any questions please call SANDY NEUMAN PC BOX 1 003 fhLVIEL NY I 77 516 293-5835 18 Model Aviation RC pleased introduce THE WEASEL Customizable monoplane Introductory offer Kit Price$9695 $8695 F ND GIANTS FOR GIANT SCALE BUFFS JN4 Jenny $27 815H Monqoino Rb $42 okke 07 FIn $390 10959 MoqoBonb $35 70 Boylo OenBoe $32 98 5eon PTI7Koydol $56 60 Honno 4 Pe Roon 533-OH N81k Wdooo P61 $69 60 Sop onorine S68 $24 71 Doog DC3 C471 $35 89 Soperononin 56B 535 95 Song $C3 C47 $55 63 Coot ifonnin P-6R $42 86 Hosoko Toonco 13 552 94 C~n Hoonk P6E $56 64 Slon Sky-Con518 74 Doolittln 0811 54$ 72 Coo5251 /4 t&$ $46 95 Mononoopo 5ponl $36 158 Con 03U1/4 L&5 $5685 Ho11 Spr Boildog $43n- 60 Dooglo M2 Moil $24 107 Aeonoo C-3 Spn $35 68 Britol Rolidog FIn $30 62 Honnod Roce Ike $451 59 BononRoce MtA 554 78 Troen WW Ron 035 107 Onorn Reonol P8P $54 63 Con Oohk Fl IC $42 69 Ljndknog NO211 $28 94 Coo Conink FliC824 91 tndbeog NX21 1 $39 66 Delion Coool Roo$24 96 WoNWINov Ron $48 62 HoooMnAAoiSgon$35 74 C Helidno 592C4 025 94 HoonMoMolOgon$45 108 PoiooiPT19 Tn $59 83 Booing P26A Fin836 65Wooo Topon-Wing $36 84 Booing P36A FIn548 95 Wono ToporWing $48 69 Wono C6 Cobb $36 75 WeolId Lyondeo $32 78 Otog $38 150 Wn.Id Lyonde $49 Pond Toinnin 4AT $36 ond Trirol 4AT $48 82 Look 11 Oleolno 84$ 114 62 Olinon 7/W 087 $18 968 $1 011000 T/W 087 $26 93 122 Olinson 71W 087 $38 38 59 BnoloI FIn P28 $30 780 118 Bnitol FIr P28 $4S 124_ 74740, Peoo $45- 65 look Eopoe. oo Woniok P40 834 83 Look Al Rnpne. $26 o8l Conoio 945 $35 77 WWn, 121 RedL $48 80 VogI Coooio P45 $89 63 C Onolonok F7C 1 $45 78 Look LIgklng P38 $38 94 C Oeoionnk F7C 1 $57 56 RopOeo8en An $24 1585k0 028 Annpk $49 74 8epSeo8ee Ann $39 60 Roe og 105 Sport $36 70 Pipen J3 Cob $29 90 Bon no iso spool $49 106 Piper J3 Cob$397 72 Northrop Gonnono $48- 98 Look iiodon 8nk $38 96 Noolhnop Oon,oo $75 4 63 Goon F6F Helinol 528 95 SlinnA Loon 2/14 $56 77 8oeiog 8170 P01 535 60 OlincA Loon 3 /M 842 8o. 8170 Pool $55 130 SIn too 3 14 $82 68 Wnti Whininoind $32 78 Coneol Con PEYSA 042 68 N Anne Nonion $39 104 Con Cot 98Y SA $56 Bononoo VToii $39 65 M Ci no CI opon 065 77 Loenoonke Se4nn $25 97 MCi Ci pper $75 73 NA 825 Bonoken $49 62 Co te NC 4 059 65 MMooooder 826 $49 94 Cort ne NC 4 $69 flUe ores 000ES OnOEtER SIZE Gone 5000 H 5o14 Thin $eoiers Pobno,ok1enl 10 ohonge nen 1400 Morn SOn 59 6134 P09 Alonoy toni Add 10% no nil node, inipp 08 & OS etn $SA Con & Mno EieonReoe II 15% i25% 9 onigi notolog $200 linniodon Pnino Lit Polon i,t* eotion oiooo 51 00 obo foneigo odd $100 LE VELAND MODEL & SUPPLY Co 18387B DETROIT AVE CLBV8LAN$ OHIO U182 nnonnnoneObOOOOrO bone S1SPME ST i0o 0STH3161 9613600 nooe.nrenoonooo Over 237 cowls kit scratch built models Also over 34 round cowls ranging 4 14-7/8 diameter 55 diff size 8 shape wheel pants custom Make Parts Vacuum Form Canopies Pie. mmd $1 ferceplgteht Tin FIENSLASS SPECIALTIES 38824 Mt Kisco Dr. Sterling Hgts MI 48310 PHONE 313 421-8358 hAZED & HEAT-lUAIID WIE GEARS & CUANE PHONE 313 261-9064 bonded engine-mounting studs am aware least two cases such soft mount failed failure occurred after about two minutes running time Don Lowes column Flying Lowe May 1989 issue RCM illustrates system has successfully used 37 cu engine also number other soft-mount de signs vibration-absorbing rubber compression such marketed G&A Products samples recently appeared mailbox design would subject engine separation since has no bonded metal/ rubber components just too model magazines market have subscription So possible article comparing effec tiveness different brands soft mounts re ducing vibration transmitted airframe has already appeared would well worthwhile project somebody access necessary vibration-measuring equipment undertake Runway barrier couple years ago col umn carried photographs RC club flying field used tennis nets along near edge runway prevent out-of-control models entering pit/spectator area sample another product can used model aircraft barrier arrived AMA HeadContinued page 22 Duracraft IflC / 1007 Orchard Grove Dnve Roysi Oak Ml 48067 DuraPlane IlThe trainer rugged enough teach entire club fly Tell hobby shop owner want see toughest model aiplane money can buy IteM csau NO IurAsa products Inc Only certified checks money orders accepted Minimum order 11200 three packages 4 Powerpof eN $350 per package $150 shipping handling CT residents add 15% sales las Prices sabjact change sohce DEALER INQuIRIES INVITED lunthe infornutiOn dealer prices send SASE Business Card SERMOS RIC SNAP CONNECTORS Calar Cm Staten Box 16767 Stanifrrd CT C6 203322-6294 20 Model Aviation noise generated models al ready using soft-mounted engine suggest FIBERGLASS PARTS consider next project However before you might consider word caution relates safety planning use engine having over 061 cu displacement rely solely soft mount rubber cylinder features Performance Blended Fuels \.ORIGINALSINiTHigher Performance ther Running Superior Lubrication ualled Rust Protection SEE YOUR doesnt stock Byron Originals Fuels order direct FREE FREIGHT ii Overseas call shipping quote RETAIL PER GAL ORDER NONITRO CASE Synthetic/CastorBlends 31300040%Prer 31300055%Byrt 31300065%Prer 31300088%Prer 313001010%Byrc 313001110%Prem 313001210%4Cyclc 313001310%Helicop 313001615%Premiurr 313001715%4CycIe 313001815%Helicont 3 13002020%Byro 313002525%Premium 313003535%Premium C 313004545%Premium C 313006060%Premium Cc Straight Synthetic 21200040%Premium F 21200055%Byro-Jet Str 21200065%Premium Spu 212001010%Byro-Jet Strai 212001110%PremiumSporc 212001515%Premium Sport 212002020%Byro-Jec Straig 212002525%Premium Compc 212003535%Premium Compc 212004545%Premium Cop" Minimum Order Quantity--i Byron Originals Inc ox Performance Hobbies Helicopter Specialist Stainless Steel Bearing Kit Shuttles $5995 Performance Turnbuckle Kits a Hastle Free Adluslment b No Ball Link Plyers Needed C Comes Complete Adjustment Wrench Most kits Start at 1295 Best Price Around Complete Test Flown Shuttle Packages Slop Hovering Aroundi Call & Order Today 206 939-4000 z PERFORMANCE HOBBIES 711 Auburn Wuy N 0 Auburn WA 98002 quarters last month havent seen yet telephone conversation AMA Technical Di rector Bob Underwood appears similar bright orange plastic mesh safety fences frequently see around construction sites Bob forwarded letter its distributor Twin Ridge Industries Inc contained specifications safety barrier fabri cated high-density polyethylene has enor mous strength two feet high comes rolls 50 100 ft supplied 42-in hardwood stakes five-foot centers ex pected cost around $1 per foot clubs interested Jerry Juskowich General Sales Manager can reached 1-412/5392307 Fireproof model letter Warren Spur geon Santa Barbara CA contained some com ments suggestions prevent onboard fire reported June Safety col umn result muffler Zenoah G-38 coming loose answer G-38 owners changing Tatone JTec muffler have flying Bridi Rearwin Speedster three years have problems muffler bolts coming loose after 20 25 flights have used socket-head Allen bolts Loctite still works loose take apart muffler comes 6-38 engine will see has two spac ers keep two pieces collapsing cinch down bolts Tatone JTec mufflers have spacers So no matter much tighten bolts expansion will warp muffler casing cause bolts loosen remedy can cut two spacers Continued page 131 22 Model Aviation FACTORY PRICE PER GAL CASE OF 4 1-4 CASES 5 CASES & UP $ 640 750 750 810 850 850 850 850 1015 1015 1015 1175 1335 1650 1965 2230 S 640 750 wIth 364-it BLUES CA getting down get protected CA mask Safety Plus mask will eliminate CA fumes epoxy polyester resin vapors air breath Lightweight easy breathing comfortable CA Mask $15a95 Paint Mask $2045 See hobby dealer first doesnt have what need order direct Safety Plus PO Box 1173 Dept 12M Clinton Mississippi 39056 Call toll free 1-800-842-7233 Mississippi dial 601-924-%40 VISA MASTERCARD accepted COD add $250 shipping handling included Dealer Inquiries Invited PLU5 Worlds Largest Range Fiberglass Carbon Fiber Props Sizes 1 12A Quarter Scale 2 3 4 Blades 0 Increased Availability 1989 Send SASE Information TOM DIXON 1938 Peachtree Suite 401 Atlanta GA 30309 Letters Editor Continued page 11 Ni-Cds dont seem affected cold anything like alkaline cells Once problem corrected lit tle Nickle flew flawlessly greatest small three-channel airplanes have ever flown James Harris Marion OH Safety/Preston Continued page 22 fit inside muffler between bolt holes will stop two halves warping have done three G-38s havent problems mufflers coming loose Now respect firewall fire picture column builders Giant aircraft would use engine mounts made engines flat plates come would have air gap behind muffler cool ing gasoline engines run hot dont think put hand hot muffler like did five years ago Thanks have taken time write describe mishaps Without letters would no Safety column wish another safe month Sweepee/DhaII Continued page 37 wont take off until its ready airplanes slow speed flying characteristics indicated also peculiar com ing out near hover increase throttle gradually ease off elevator stick using little down control get some extra speed Try maneuvers safe al titudes beginning youre getting used airplanes foibles might also find need get acquainted its strange appearance air before attempt ing anything too fancy color scheme clearly distinguishes front plane back should come handy low throttle condition flight charac teristics model similar sport airplane until force high angle attack slow speeds gradually increas ing up control seems have little effect airplanes attitudebut does bring model virtual halt point sink rate will high probably will have keep rudder control active keep course However plane shows relatively little tendency stall out condition Im still exploring full range SAFE FLYING IS NO ACCIDENT airplanes flight characteristics Join search Discover Sweepee yourselfand happy backward flying Radio Technique/Myers Continued page 41 must wary transmitters 910 MHz 455 channels away Such transmitters MRS/PRS transmitters find strong signals S SlO5 115 125 135 145 565 575 585 595 605 have consider potential interferences xx5 shorthand code PRS channel 10 kHz above RC channel number given Channel 105 0 MHz Image example strong signal S und 72040 PRS 125 may interfere 5C455 receiver channel 125 RC58 summary find something scan ner note its frequency some mathemat ics see what found might problem Lesson #6 much stuff really inter ference looking signal 72xxx MHz has strength 55 nd can expect signal adjacent channel problem wideband receivers air Expert opinion says 55 al should investigated Try find Out what causing Wet insulators high-tension line might cause condition often clears up after sun burns off morning dew An S ignal should always answered ground range check before flight EVEN Continued page 134 August 1989 131 responding advertisers mention read about ModelAviation I