Slow-Worm 432

AS LONGTIME modeler returning Free Flight after 35-year detour categories CL RC initially found Rubber models appealing first Power efforts began after became comfortable Rubber Later still came Power modelsmore models success found others un doubtedly have along higher performance todays engines come faster crashes complete demolition responsecall obstinacywas dig heels persist After going through numerous models built both kits through own design efforts pattern began take shape successes came fitful tem porary good ships soon found ways wipe out primary problem seemed consistency Moreover Id needlessly concentrated elegance pro longing building time delaying author Slow-Worm next van must have acted fast have ac quired modeler license plate ahead least half other modelers Florida learning process Eventually realizing what needed model could built quickly could crashed came up prescription design would simple medium sized functional care maybe attractive no auto surfaces moderate power en gine today fits description first Slow-Worm built requirements engine selected OS Max 15 FP slightly bored take crankcase pressure hard tank burning 35% nitro turns Cox 7 x 3 prop 19000 rpm As can imagine plenty power 14-oz all-up weight beginners ship no Properly trimmed model will three minutes seven-second run rather thats what does expect itll havent stopped learning course has Slow-Worm got over comprehen Slow-Worm 432 Want learn fly Free Flight Power wont find simpler hot competition ship 09-15-powered 54-in-span 14-oz py lon job helpful mentor trimming flying author U Dave Platt Left The engine-timer-tank setup authors 432-sq-in version engine 05 Max 15 FP swinging 7 x 3 GF Prop Note simple pylon Right building process always faster easier accurate first kit project shown 78 Model Aviation author holds Slow-Worm against sky backlighting translucent MonoKote cov ering give some idea appeal Free Flight Dave says hes built Slow-Worms little day Before passing water-cooled X-Acto knife check temperature Left The stabilizer under construction Because author uses glass-topped worktable employs weights rather pins hold structure flat against plan Note plastic wrap between frame plans Right structurally complete stabilizer Its light weight strong rear geodetIc ribs gussets resist twIsting great feature using heat-shrink covering material sion hump Free Flight Power al lowed move Together few friends Ive built model gamut sizes great little 300-sq-incher aTee Dee 09 onuptoa l190-sq-in hum mer Rossi 60 engine have proven easy adjust quickbuildingsome single day Want make Its simple cut parts two youre Construction notes follow rather minimal touching upon impor tant points Slow-Worms structure sim ple plan self-explanatory After get ting building out way want concentrate trimming flying mod el Wing Make main spar first Cut four lengths hard balsa stock three shorter pieces harder stuff braces Assemble spar over full-size front view Sand bottoms braces level underside spar Relieve three A-in-thick ribs dihedral braces ribs also relieved /16 center section sheeting Glue center A-in rib spar an gle bisecting dihedral angle fron tal view perpendicular plan view same two A-in ribs polyhedral breaks Set assembly over plans build rest wing panel time Youll notice cutting joining leading trailing edges spars center thick rib far easier building separate panels trying mate accurately Frankly its method always use building someone elses design doesnt call Fuselage engine mount may terest Ive used style mount engines up 60 always works well Its light functions engine unlike commercial mounts always avail able need mount also holds skid nicely Caution certain get fuselage straight dont youll have correct later work rest fuselage structure like tail simple enough require no further description Covering Ill confess being snob modelwise Instant hobby products offend Ive always used traditional covering materialssilk Japanese tissue nitrate dope etcand still things have discovered though MonoKote has great advantages used FF Power flying surfaces Among ability retain warp rewarp out creeping priceless consistent results gives MonoKote has greatly helped achieve consistency trim models have surviving much longer just materials virtues recommend MonoKote wings stab regular covering tissue silk glass cloth fuselage Trimming moving RC FF mod els came learn essential difference between two RC hobby dexter ity FF hobby reasoning being found myself hungrily absorbing decent article could find FF model ad justment FF model appearing mags would find quickly turning trimming section Man dont just hate article says Try hand October 1990 79 simple strong effective engine mount landing gear attached Its easily quickly made can built adapt almost engine configuration fuselage being built over plan photo its about halfway finished black strip visible side panel strip 007 x /4-in carbon fiber Its shown plans greatly strengthens fuselage little no weight penalty structurally complete fuselage pylon ready covering engine mount place cutouts timer fuel tank complete Note strong landing gear wire --I --m---r cz II GUSSETE EVOM IRt 4$GB ASACE- Ta- FE 3 i LEFT CENTER PANEL FLAT no WAI UNDSS C0VSTSUC rip qfl SISMEESSSTAB TIP RIB WG Movar 4ax 2 PRUCE C04U43 TED 000CC else tAfl 5 5/3* ~ 5/IS & FELON PI4RTS III -----4DfltUSfl TOM Ak ESS/ME USED-os-. rz-wr sLOw-1JJORm 432 *140 POADS ST 0500 MATE I L#GNTIES#SMT CLASS POkIER FOR Nor 09 I FUSELAGE CROSS-SECTION rO Snr isSBUS 5 AREA 435 wIT AT o IIS lIMES INFUEC TANKNOWECSNUFFER TUBE SefliT IN TUB SICK 505K CMEETS a/3 SNT --t0~DTFUSS -~SNUFFSR TUBE S/SE MOUNTPT BAND glides go power flights have mastered intricacies FF Power adjustment can skip part Im certain other begin ners out need stuff Heck anyone can build darned thingsespe cially Slow-Worm Getting fly right skill art fun found Im going make two specific recoinmendations help out first youve doubtless seen times already Pay careful attention preflight checks really second bit unusual Take text you go flying Reading model does so adjust thus such isnt going help unless have need Youre going remember small details effects etc un 5 less have words right elbow Take magazine Preflight check consists trying blueprint airplane just would blueprint engine optimal perform ance Check CG center-of-gravity course Thats fundamental Make sure its exactly marked adding lead nose tail must get right Check Left wing begins take shape main spar being assembled positioned first Right left center wing panel nears com pletion Note 1A-in-thick ribs being employed dihedral break heavy-duty gussets side rib trailing edges 80 Model Aviation tSn PASTS 40505 sow LAGE conSWUCroN *4 4ft USOSESOTEGI FUSELAGE COPSTRNCflON K1-J 400L NK FRON 2 FUS TCPATE Full-Size Plans Available. Page 194 __I__ I_-- 1KitPRC BUILT$s Rio $oiSIIToPSAR IAIA ffn sea weelOSS NAIOSPAG $ x iM- /44CC FUSTi 01/CO flitS DRAW Ode - / RiGor crmrg .vEc wes i/s WASH/n Ce ci WASP C 14 o ~--------t---~ Se/S 4/500 - ltN 06 Ar saso 0 s//F TOPSTAB NAIOSSAB 15 1/I/A cc 4/Is w s/aCo-carrHa-vEprOdsossers sot StOCk FCC / CS iNDICATE position oc Cd//ICE BUILOIPJS COT-DO NH NYLON 5000CRi/OEM ANCHOR FOR BOOSTER - I AND -Th - Th Z OP LJAE SO/GEFUSELAGE ooes /t& S*flh mc GOTTOSE FaRMERS s/so 0 5/5 ICCO // s/os tori F/P PANELS save Vs WASHOUT Ta cc WiNGOIB 04 $6 C I/ BAils STAB BEAR RIBS TO AgSPSIL STAB BIBLET i $6 2 tEa ftR PLY K S/ETCH SNOWiNG POWESi TI/SN TRIOS WEDGE OWOOI 450 7/pASS/c77//S Il/IRE RETAiBESFE STOCK SERTICAC F/N 5/3* SOT tirI -ri--/- lFI ii \ Jt-Sb DOWEL FOR STAB SANDSliiIIV1 AC FvOcTT11TN iI JHOCE/N75P111C/NDERF/N S SOT Dr C/NO -- COUNTLAND $AICSOA 20 rsr AT/DPI OF fl/BE DETER/A/NE S TIP ANGLE 45 WANTED Os HARDWOOD AS /AOI/NTS /i GLUE tOft/S TI/ 40 F/LF IfiJi wing warps agree plan callouts Glue keys underside wings next wing mount ensure con sistently accurate wing alignment As measure wing tip fin making sure wing square fuselage same stabilizer Thrust line okay Fin straight Lay straightedge along pylon back fin check alignment Most people also tell check incidences wing tail Im going totheyll ad justed during flight testing later anyway Run engine see timer working right Try out DT dethermal izer two three times check tip-up gle too Lastly look tail tilt must come close four degrees indicated plan Alright lets go fly Flying Now field theres something want share call alarm bell theory works way make adjustment model doesnt respond should alarm bells start ringing always course its just used ignore Result crashed airplanes Now listen something abnormal unexpected Continued page 184 Left center panel supported correct dihedral angle tip panel built over plan attached directly center panel Right completed wing ready final sanding covering little practice wing can built point about two hours October 1990 81 5I2345 BOB HOLMAN PLANS best scale 29 years Plans tram Englands leading scale modeleliers have plans have won everything BEST Show Toledo World Scale Meet Masters Plans Brian Taylor Dennis Bryant Thorpe BROS leading British magazines Catalogs Best Scale $500 Model Aircraft plans Handbook 1989-90 $500 Scale Drawings Plans Handbook $500 RC-Model World Plans Const Guide $500 Catalogs $400 3 shipped togethar order Please donot buy glass FW 190 Kit untill check quality glass work Bob Holman Kits Call BH 714 885-3959 Spit MK 1 69 AfPi Plans $2500A essories $6000 Shipping Messerschmitt 109E 68 Plans $3500 Accessories $6500 Shipping $500 Hawker Hurricane MK Plans $2500 Accessories $6000 Shipping $500 Dornier 17z 74 Plans $2400 Shipping $300 Heinkel 111 74 Plans $3100 Shipping $300 Ju 68 72 Plans $2250 Canopy $1000 Shipping $300 Messerschmitt BFI1O 71 Plans $2500 Accessories $2500 Shipping $500 50th ANNIVERSARY BATHE 2 CG center-of-gravityfore/aft balance point model complete rubber motor 3 Stability marginthe distance between CG AC expressed percent wing chord 4 Tail moment armthe distance measured tween 25% chord points wing stab CG location CG must always ahead AC shown model stable works like models weight acts down ward through CG aerodynamic forces act upward through AC model equi librium flight forces exactly balance model noses up aero force increases enough bring back level flight nose-down condition aero force reduces allowing tail drop distance between CG AC margin leverage aero forces have restore level flight margin drops zero model will have neutral stability will go whatever direction pointed until some outside force diverts CO behind AC model unconditionally unstable nose comes up will continue rise What about too much margin model has very high positive stability margin two undesir able things happen 1 The stability high little can stop After contact between outboard wing tip curved ceiling beam model chugs along turning obstruction invariably hangs up slides down curve optimum mar gin overwound model tends stall turn torque away obstacle con tinue flying 2 The angular difference between wing stab greater giving higher drag power required both climb cruise flight speed higher time high mar gin can help highly turbulent air higher speed helps model penetrate better Outdoor models correct stability mar gin fixed adding weight nose tail adjusting trim fix glide wing Indoor model can properly located respect CO possible set cruise trim new model almost perfectly few two test flights Once margin trim set always fly model same weight rubber used find its CG ballast plane keep same CG location Worlds lightest timer Two photos show works Stan Chiltons gear-retraction mech anism record-holding ROG Stick model shot shows top view retracted gear hinge mechanism other side view stop timer Well can see stop timer too tiny see tiny piece double-sticky transparent tape hinge mechanism both pivot torsion bar retracts gear Stan cocks timer using pair tweezers tape holds couple minutes Al though CO shift gear retracts model very stable shows no apparent ef fect retraction long last photo shows Jim Clems interesting experiments inspired rash loooong Federation ROOs Federa tion ROG no officially recognized AMA classEd prototype version 39 long overall proved slightly unwieldy Jim won individual honors Federation ROG USIC flying 34-in version 751 flight long ones seem fly just about like shorter ones except may have higher potential duration Slow Worm/Platt Continued page 81 happens find Out immediately Lets toss plane once want nice fin glide too close stall models teni toward stally glide get up ani out ground effect should tendenc turn right too pronounced though just tendency model too slov stally add shim under stab leading edge glide too fast divey add shim un der stab trailing edge Precut some hims same size forward stab mount put field kit ua glue place dont want crashed ship over shim compressed fel out Repeat tosses until glide looks good about turn doesnt match abovi descriptionalarm bells Find out th fuselage fin bent misaligned will affec glide circle must corrected youl never get ship flying properly higl speed power flights bring Lets say glide circle okay clos4 enough minor adjustment stab tilt gle fixed means can proceed ha next stage first power flights Set DT want about 20 30 sec onds point Set engine timer abou three seconds Start engine adjusting fo] slightly richer leanest setting Hold thi model around fuselage behind pylon aim dead wind about 80 up trip ha Continued page I8 iXX xxxxxxxxxxxx FREEDM 9O ONLY MUFFLER$1295 xEasily attached 25 108 size engine xsilencers FREEDOM 90 Muffler gives XAMA recommended 90 dBA 9, silencing Xnoise noise cornlaints Ensure X freedom fly Unchwlenged through 90s x FREEDOM 90 X Tested qualified US published engine reviewer Silences 50-98% engine noise WITHOUT POWER LOSSI Uc US SNUF-LER Patent #4858722 \I1SA AND MASTERCARD 1-800-NOW GO RC accepted Add $2S0 far 660-4872 I 2 weeks delivery time Made America II American Technology IdODa. ENGINES RJL Manufactures USA RJL R/C & U/C ENGINES 15 thru 61 Forster Glow & Ignition Engines FACTORY PARTS & SERVICE FOR HB Engines Cox Conquest 15 Kraft 61 Taipan 40 HGK Engines Testor/McCoy Series 21 Forster Remco Viking twin Call er wrre far free information RJL Industries PO Box 5 - Sierra Mack-e CA 91025 818 359-0016 AttT7i 4 BRITIAN COLLECTION Slow Worm/Platt Continued page 184 timer let go utmost observe flight let excitement noise distract Before get what model did lets talk about what want looking steep upward spiral right under power Imagine spring pulled almost straight youre seeing what want now talking about power pattern tran sition glide dealt later Did plane show initial part path described fine Skip couple par agraphs lets see what model did stead likely scenario After climbing fairly straight first airplane veered left roll engine stopped adjust ment small wedge right rudder answer its necessary detail ex pected effects various adjustment options open us Its equally necessary builder begin understand effects some expert eyewitness merely telling what will have no lasting benefit Lets look list Rudder effective during sec ond half power run say threesecond point As speed increases effect creases Small wedges used power adjust ment have little no influence glide Wing warp Similar rudder effective ness rises extra speed provides roll couple yaw Slight effect glide What lit tle makes model glide toward washin typical pylon models including Slow-Worm means right what want anyway Side thrust/downthrust Used correct direc tion during first two three seconds power run Effect diminishes during acceleration drops zero full speed Incidentally effectiveness thrust line adjustments no near great Power ships rubber-powered jobs Slow-Worm Ive ever seen has needed degree two left thrust downthrust seems have strange undesirable effect producing nose-up jump engine stops Therefore avoid possible Tail incidence positive negative will influ ence both power glide influence peaks during power run since speed greater Tail tilt will control size glide circle tilt smaller circle model turns toward high side stab Little no effect under power because tilt works under high-lift conditions During power run gle attack thus lift stab minimum CG shift critical adjustment affecting bott power glide Change CG im perative Most kit plan models have opti mum CG position marked will fly well trim Looping sign CO too far ward too far aft CG will cause model have slow no recovery dive point motor-cut during glide Lets get back Slow-Worm just made its first flight reason need rudder trim wedge wing warp effect left ai leron eventually overcame right turn ten dency shared pylon models due slip stream pylon happened speed got point wing warp became powerful force work Thus need right-turn adjustment like warp must increase its effectiveness speed answer rudder wedge way dont use rudder trim tab wedge glued onto rud der may look quite nice has ad vantage being controllable great precisios simply varying length Anyway arent static points FF other hand model showed ten dency fly too much right other correc tion needed did immediately prob ably need rudder wedge left side thi fin model climbed satisfactorily first leveled out raced around righ turn answer will different What have just described loop True maneuver performed angle th groundobliquely likebut its still loop correction thats wanted shim o positive stab incidence Recognizing fligli path what came learn di great secrets FF Power trimming good gen eral rule follow adjustment ha made since last flight engine rul should remain same put othe way around engine time can increased oni last flight safe no correction indicated Meanwhile though DTd early t save time some indication glide will hay become apparent Corrections can made th glide needed go back list se adjustments may also affect power pal tern Tail tilt circle diameter slight amount weight nose tail should needed Sometimes model will stall during th glide occasionally quite severely indica tions pointing need positive tail ir cidence Try Such adjustment often hell power pattern well Thats because di INTERMEDIATE CONTEST/SPORT SAILPLANE DESIGNED TO ALLOW USE OF FLAPS FOR CAMBER CHANGING AND APPROACH CONTROL SPAN89 INCHES WING FROFILE MODIFIED F/lOS AREA 780 SQUARE INCHES FUNCTIONS/ RUDDER ELEVATOR FLAPS WEIGHT/ 45 OUNCES AND UP MOOIFIED SCHUMAN WINO PLANFORM COMPLETE HARDWARE KIT EASY TO REPAiR BALSA/SPRUCE FUSELAGE SOUTH WiND $7495 US FUNDS plus $600 Shipping Handling Continental US MAX MILLS MODELS PO BOX 246 SARCOXIE MO 64862 417-548-6515 DIVISION OF FULL MOON DESIGNS 0 z a. 0 188 Model Aviation GOLDEN GATE HOBBIES PO BOX 27001 FRESNO CAUFORNIA 93729 M/C OR COD HA TORI TETTRA DICICON IMMSK HATORI BLUEPRINT SHOWS ALL EXHAUST ITEMS FULL SIZE 2FT X 4FT $ 5 WE WANT NEW DEALERS ! 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A5 9 TocliO THE SCHNEIDER SPORT PORT MODEL R/C FLOATPLANE RECOMMENDED ENGINES 45/60 2STROKE 60/80 4STROKE QTF FLOATS INCLUDED LENGTH 34 IN CAP 6/10 LBS SPAN 57 IN AREA 600 SQ IN 804 8736604 STREAM INCORPORATED s BIXJE iflE C NUPOR NEWS VL 23606 DEALER INQUIRIES INVITED 4 ower run can actually get away nailer decalage angle demanded lide very effect created VIT ariable incidence tail systems fact Over period five 10 flights youll rease engine run legal limit seven conds Only full run after model reached its ultimate speed can total shape power pattern viewed Ordinarily its uite acceptable settle tight spiral ian full turn safe trim usually gives ood transition well However starting nd gradually carefully taking away ght rudder can give faster verti sI climb model thats troublesome trim outsay O flights its still rightwill invariably rove have incorrect wing warps right ing washin vital keeps right wing lift ig during climb prevent right-hand spiral ive warp excessive however can ad serious difficulties sure sign eed change wing warp model espite healthy amount right rudder tab sts upon swinging over left-roll attitude late climb Heres MonoKote cover ig earns its keep rewarp job easy rids well Readers whod enjoy learning epth article FF adjustment referred o-part series Ralph Prey July Au ust 1979 issues Model Aviation Though article over decade old principles havent changed never will Indoor WCICIemens Continued page 88 barely got watches started Banks mod el badly distorted torque fully wound motor wouldnt climb hit floor after mere 54 seconds Teammate Larry Cailliau using helium balloon reposition model during its first official allowed often effectively used under FM rules inadvertently crum pled wing sent ship spiraling slowly floor time 1241 De spite very respectable 3921 Cailliaus second effort fine 4120 number two Bob Randolph end day found American team fourth place hind Romania Japan Finland dividual standings Randolph second Cailliau 13th Cezar Banks found him self unaccustomed dead last 25th stay would brief Jim Richmond lost no time defend ing title calmly put up two splendid flights 4318 4215 both using same 040 x 060 x 20-in Pirelli motor hed flown victory 1988 FM meet seventh eighth official flights Pirelli motor some good 1982 Pirelli said Jim cranked 2250 2290 turns respec tively two flights second ship miraculously squeezed through girders during circle Official flying began 1 pm Tuesday day two Bob Randolph suffered two midairs including saw dead-sticking descent Romanias Aurel Popa snag ascending model prematurely ending good flights both contestants Reflights al lowed after such collisions no official flights lost reflight doesnt bring back high time lost collision Despite mishaps Randolph ralsed remarkable string 40-minute-plus flights four timings 4114 4046 holding second place individual stand ings 240 over resurgent Cezar Banks Banks 4105 Larry Cailliaus 3921 helped increase American teams total 24110 leapfrog first place team standings position would hold throughout remainder contest GgE hly publication covering International RC Soaring Scene USA $17 yr $22/yr 1st Class Canada/MexIco $22/yr US funds Asia & PacIfic $28/yr US funds Europe & UK $28/yr US funds Surface Mail Foreign $19/yr US funds R/O SOARING DIGEST PO Box 6680 Concord CA 94524 October 1990 189 LENGTH 47 IN iTEIGHT 65 / 70 LB

AS LONGTIME modeler returning Free Flight after 35-year detour categories CL RC initially found Rubber models appealing first Power efforts began after became comfortable Rubber Later still came Power modelsmore models success found others un doubtedly have along higher performance todays engines come faster crashes complete demolition responsecall obstinacywas dig heels persist After going through numerous models built both kits through own design efforts pattern began take shape successes came fitful tem porary good ships soon found ways wipe out primary problem seemed consistency Moreover Id needlessly concentrated elegance pro longing building time delaying author Slow-Worm next van must have acted fast have ac quired modeler license plate ahead least half other modelers Florida learning process Eventually realizing what needed model could built quickly could crashed came up prescription design would simple medium sized functional care maybe attractive no auto surfaces moderate power en gine today fits description first Slow-Worm built requirements engine selected OS Max 15 FP slightly bored take crankcase pressure hard tank burning 35% nitro turns Cox 7 x 3 prop 19000 rpm As can imagine plenty power 14-oz all-up weight beginners ship no Properly trimmed model will three minutes seven-second run rather thats what does expect itll havent stopped learning course has Slow-Worm got over comprehen Slow-Worm 432 Want learn fly Free Flight Power wont find simpler hot competition ship 09-15-powered 54-in-span 14-oz py lon job helpful mentor trimming flying author U Dave Platt Left The engine-timer-tank setup authors 432-sq-in version engine 05 Max 15 FP swinging 7 x 3 GF Prop Note simple pylon Right building process always faster easier accurate first kit project shown 78 Model Aviation author holds Slow-Worm against sky backlighting translucent MonoKote cov ering give some idea appeal Free Flight Dave says hes built Slow-Worms little day Before passing water-cooled X-Acto knife check temperature Left The stabilizer under construction Because author uses glass-topped worktable employs weights rather pins hold structure flat against plan Note plastic wrap between frame plans Right structurally complete stabilizer Its light weight strong rear geodetIc ribs gussets resist twIsting great feature using heat-shrink covering material sion hump Free Flight Power al lowed move Together few friends Ive built model gamut sizes great little 300-sq-incher aTee Dee 09 onuptoa l190-sq-in hum mer Rossi 60 engine have proven easy adjust quickbuildingsome single day Want make Its simple cut parts two youre Construction notes follow rather minimal touching upon impor tant points Slow-Worms structure sim ple plan self-explanatory After get ting building out way want concentrate trimming flying mod el Wing Make main spar first Cut four lengths hard balsa stock three shorter pieces harder stuff braces Assemble spar over full-size front view Sand bottoms braces level underside spar Relieve three A-in-thick ribs dihedral braces ribs also relieved /16 center section sheeting Glue center A-in rib spar an gle bisecting dihedral angle fron tal view perpendicular plan view same two A-in ribs polyhedral breaks Set assembly over plans build rest wing panel time Youll notice cutting joining leading trailing edges spars center thick rib far easier building separate panels trying mate accurately Frankly its method always use building someone elses design doesnt call Fuselage engine mount may terest Ive used style mount engines up 60 always works well Its light functions engine unlike commercial mounts always avail able need mount also holds skid nicely Caution certain get fuselage straight dont youll have correct later work rest fuselage structure like tail simple enough require no further description Covering Ill confess being snob modelwise Instant hobby products offend Ive always used traditional covering materialssilk Japanese tissue nitrate dope etcand still things have discovered though MonoKote has great advantages used FF Power flying surfaces Among ability retain warp rewarp out creeping priceless consistent results gives MonoKote has greatly helped achieve consistency trim models have surviving much longer just materials virtues recommend MonoKote wings stab regular covering tissue silk glass cloth fuselage Trimming moving RC FF mod els came learn essential difference between two RC hobby dexter ity FF hobby reasoning being found myself hungrily absorbing decent article could find FF model ad justment FF model appearing mags would find quickly turning trimming section Man dont just hate article says Try hand October 1990 79 simple strong effective engine mount landing gear attached Its easily quickly made can built adapt almost engine configuration fuselage being built over plan photo its about halfway finished black strip visible side panel strip 007 x /4-in carbon fiber Its shown plans greatly strengthens fuselage little no weight penalty structurally complete fuselage pylon ready covering engine mount place cutouts timer fuel tank complete Note strong landing gear wire --I --m---r cz II GUSSETE EVOM IRt 4$GB ASACE- Ta- FE 3 i LEFT CENTER PANEL FLAT no WAI UNDSS C0VSTSUC rip qfl SISMEESSSTAB TIP RIB WG Movar 4ax 2 PRUCE C04U43 TED 000CC else tAfl 5 5/3* ~ 5/IS & FELON PI4RTS III -----4DfltUSfl TOM Ak ESS/ME USED-os-. rz-wr sLOw-1JJORm 432 *140 POADS ST 0500 MATE I L#GNTIES#SMT CLASS POkIER FOR Nor 09 I FUSELAGE CROSS-SECTION rO Snr isSBUS 5 AREA 435 wIT AT o IIS lIMES INFUEC TANKNOWECSNUFFER TUBE SefliT IN TUB SICK 505K CMEETS a/3 SNT --t0~DTFUSS -~SNUFFSR TUBE S/SE MOUNTPT BAND glides go power flights have mastered intricacies FF Power adjustment can skip part Im certain other begin ners out need stuff Heck anyone can build darned thingsespe cially Slow-Worm Getting fly right skill art fun found Im going make two specific recoinmendations help out first youve doubtless seen times already Pay careful attention preflight checks really second bit unusual Take text you go flying Reading model does so adjust thus such isnt going help unless have need Youre going remember small details effects etc un 5 less have words right elbow Take magazine Preflight check consists trying blueprint airplane just would blueprint engine optimal perform ance Check CG center-of-gravity course Thats fundamental Make sure its exactly marked adding lead nose tail must get right Check Left wing begins take shape main spar being assembled positioned first Right left center wing panel nears com pletion Note 1A-in-thick ribs being employed dihedral break heavy-duty gussets side rib trailing edges 80 Model Aviation tSn PASTS 40505 sow LAGE conSWUCroN *4 4ft USOSESOTEGI FUSELAGE COPSTRNCflON K1-J 400L NK FRON 2 FUS TCPATE Full-Size Plans Available. Page 194 __I__ I_-- 1KitPRC BUILT$s Rio $oiSIIToPSAR IAIA ffn sea weelOSS NAIOSPAG $ x iM- /44CC FUSTi 01/CO flitS DRAW Ode - / RiGor crmrg .vEc wes i/s WASH/n Ce ci WASP C 14 o ~--------t---~ Se/S 4/500 - ltN 06 Ar saso 0 s//F TOPSTAB NAIOSSAB 15 1/I/A cc 4/Is w s/aCo-carrHa-vEprOdsossers sot StOCk FCC / CS iNDICATE position oc Cd//ICE BUILOIPJS COT-DO NH NYLON 5000CRi/OEM ANCHOR FOR BOOSTER - I AND -Th - Th Z OP LJAE SO/GEFUSELAGE ooes /t& S*flh mc GOTTOSE FaRMERS s/so 0 5/5 ICCO // s/os tori F/P PANELS save Vs WASHOUT Ta cc WiNGOIB 04 $6 C I/ BAils STAB BEAR RIBS TO AgSPSIL STAB BIBLET i $6 2 tEa ftR PLY K S/ETCH SNOWiNG POWESi TI/SN TRIOS WEDGE OWOOI 450 7/pASS/c77//S Il/IRE RETAiBESFE STOCK SERTICAC F/N 5/3* SOT tirI -ri--/- lFI ii \ Jt-Sb DOWEL FOR STAB SANDSliiIIV1 AC FvOcTT11TN iI JHOCE/N75P111C/NDERF/N S SOT Dr C/NO -- COUNTLAND $AICSOA 20 rsr AT/DPI OF fl/BE DETER/A/NE S TIP ANGLE 45 WANTED Os HARDWOOD AS /AOI/NTS /i GLUE tOft/S TI/ 40 F/LF IfiJi wing warps agree plan callouts Glue keys underside wings next wing mount ensure con sistently accurate wing alignment As measure wing tip fin making sure wing square fuselage same stabilizer Thrust line okay Fin straight Lay straightedge along pylon back fin check alignment Most people also tell check incidences wing tail Im going totheyll ad justed during flight testing later anyway Run engine see timer working right Try out DT dethermal izer two three times check tip-up gle too Lastly look tail tilt must come close four degrees indicated plan Alright lets go fly Flying Now field theres something want share call alarm bell theory works way make adjustment model doesnt respond should alarm bells start ringing always course its just used ignore Result crashed airplanes Now listen something abnormal unexpected Continued page 184 Left center panel supported correct dihedral angle tip panel built over plan attached directly center panel Right completed wing ready final sanding covering little practice wing can built point about two hours October 1990 81 5I2345 BOB HOLMAN PLANS best scale 29 years Plans tram Englands leading scale modeleliers have plans have won everything BEST Show Toledo World Scale Meet Masters Plans Brian Taylor Dennis Bryant Thorpe BROS leading British magazines Catalogs Best Scale $500 Model Aircraft plans Handbook 1989-90 $500 Scale Drawings Plans Handbook $500 RC-Model World Plans Const Guide $500 Catalogs $400 3 shipped togethar order Please donot buy glass FW 190 Kit untill check quality glass work Bob Holman Kits Call BH 714 885-3959 Spit MK 1 69 AfPi Plans $2500A essories $6000 Shipping Messerschmitt 109E 68 Plans $3500 Accessories $6500 Shipping $500 Hawker Hurricane MK Plans $2500 Accessories $6000 Shipping $500 Dornier 17z 74 Plans $2400 Shipping $300 Heinkel 111 74 Plans $3100 Shipping $300 Ju 68 72 Plans $2250 Canopy $1000 Shipping $300 Messerschmitt BFI1O 71 Plans $2500 Accessories $2500 Shipping $500 50th ANNIVERSARY BATHE 2 CG center-of-gravityfore/aft balance point model complete rubber motor 3 Stability marginthe distance between CG AC expressed percent wing chord 4 Tail moment armthe distance measured tween 25% chord points wing stab CG location CG must always ahead AC shown model stable works like models weight acts down ward through CG aerodynamic forces act upward through AC model equi librium flight forces exactly balance model noses up aero force increases enough bring back level flight nose-down condition aero force reduces allowing tail drop distance between CG AC margin leverage aero forces have restore level flight margin drops zero model will have neutral stability will go whatever direction pointed until some outside force diverts CO behind AC model unconditionally unstable nose comes up will continue rise What about too much margin model has very high positive stability margin two undesir able things happen 1 The stability high little can stop After contact between outboard wing tip curved ceiling beam model chugs along turning obstruction invariably hangs up slides down curve optimum mar gin overwound model tends stall turn torque away obstacle con tinue flying 2 The angular difference between wing stab greater giving higher drag power required both climb cruise flight speed higher time high mar gin can help highly turbulent air higher speed helps model penetrate better Outdoor models correct stability mar gin fixed adding weight nose tail adjusting trim fix glide wing Indoor model can properly located respect CO possible set cruise trim new model almost perfectly few two test flights Once margin trim set always fly model same weight rubber used find its CG ballast plane keep same CG location Worlds lightest timer Two photos show works Stan Chiltons gear-retraction mech anism record-holding ROG Stick model shot shows top view retracted gear hinge mechanism other side view stop timer Well can see stop timer too tiny see tiny piece double-sticky transparent tape hinge mechanism both pivot torsion bar retracts gear Stan cocks timer using pair tweezers tape holds couple minutes Al though CO shift gear retracts model very stable shows no apparent ef fect retraction long last photo shows Jim Clems interesting experiments inspired rash loooong Federation ROOs Federa tion ROG no officially recognized AMA classEd prototype version 39 long overall proved slightly unwieldy Jim won individual honors Federation ROG USIC flying 34-in version 751 flight long ones seem fly just about like shorter ones except may have higher potential duration Slow Worm/Platt Continued page 81 happens find Out immediately Lets toss plane once want nice fin glide too close stall models teni toward stally glide get up ani out ground effect should tendenc turn right too pronounced though just tendency model too slov stally add shim under stab leading edge glide too fast divey add shim un der stab trailing edge Precut some hims same size forward stab mount put field kit ua glue place dont want crashed ship over shim compressed fel out Repeat tosses until glide looks good about turn doesnt match abovi descriptionalarm bells Find out th fuselage fin bent misaligned will affec glide circle must corrected youl never get ship flying properly higl speed power flights bring Lets say glide circle okay clos4 enough minor adjustment stab tilt gle fixed means can proceed ha next stage first power flights Set DT want about 20 30 sec onds point Set engine timer abou three seconds Start engine adjusting fo] slightly richer leanest setting Hold thi model around fuselage behind pylon aim dead wind about 80 up trip ha Continued page I8 iXX xxxxxxxxxxxx FREEDM 9O ONLY MUFFLER$1295 xEasily attached 25 108 size engine xsilencers FREEDOM 90 Muffler gives XAMA recommended 90 dBA 9, silencing Xnoise noise cornlaints Ensure X freedom fly Unchwlenged through 90s x FREEDOM 90 X Tested qualified US published engine reviewer Silences 50-98% engine noise WITHOUT POWER LOSSI Uc US SNUF-LER Patent #4858722 \I1SA AND MASTERCARD 1-800-NOW GO RC accepted Add $2S0 far 660-4872 I 2 weeks delivery time Made America II American Technology IdODa. ENGINES RJL Manufactures USA RJL R/C & U/C ENGINES 15 thru 61 Forster Glow & Ignition Engines FACTORY PARTS & SERVICE FOR HB Engines Cox Conquest 15 Kraft 61 Taipan 40 HGK Engines Testor/McCoy Series 21 Forster Remco Viking twin Call er wrre far free information RJL Industries PO Box 5 - Sierra Mack-e CA 91025 818 359-0016 AttT7i 4 BRITIAN COLLECTION Slow Worm/Platt Continued page 184 timer let go utmost observe flight let excitement noise distract Before get what model did lets talk about what want looking steep upward spiral right under power Imagine spring pulled almost straight youre seeing what want now talking about power pattern tran sition glide dealt later Did plane show initial part path described fine Skip couple par agraphs lets see what model did stead likely scenario After climbing fairly straight first airplane veered left roll engine stopped adjust ment small wedge right rudder answer its necessary detail ex pected effects various adjustment options open us Its equally necessary builder begin understand effects some expert eyewitness merely telling what will have no lasting benefit Lets look list Rudder effective during sec ond half power run say threesecond point As speed increases effect creases Small wedges used power adjust ment have little no influence glide Wing warp Similar rudder effective ness rises extra speed provides roll couple yaw Slight effect glide What lit tle makes model glide toward washin typical pylon models including Slow-Worm means right what want anyway Side thrust/downthrust Used correct direc tion during first two three seconds power run Effect diminishes during acceleration drops zero full speed Incidentally effectiveness thrust line adjustments no near great Power ships rubber-powered jobs Slow-Worm Ive ever seen has needed degree two left thrust downthrust seems have strange undesirable effect producing nose-up jump engine stops Therefore avoid possible Tail incidence positive negative will influ ence both power glide influence peaks during power run since speed greater Tail tilt will control size glide circle tilt smaller circle model turns toward high side stab Little no effect under power because tilt works under high-lift conditions During power run gle attack thus lift stab minimum CG shift critical adjustment affecting bott power glide Change CG im perative Most kit plan models have opti mum CG position marked will fly well trim Looping sign CO too far ward too far aft CG will cause model have slow no recovery dive point motor-cut during glide Lets get back Slow-Worm just made its first flight reason need rudder trim wedge wing warp effect left ai leron eventually overcame right turn ten dency shared pylon models due slip stream pylon happened speed got point wing warp became powerful force work Thus need right-turn adjustment like warp must increase its effectiveness speed answer rudder wedge way dont use rudder trim tab wedge glued onto rud der may look quite nice has ad vantage being controllable great precisios simply varying length Anyway arent static points FF other hand model showed ten dency fly too much right other correc tion needed did immediately prob ably need rudder wedge left side thi fin model climbed satisfactorily first leveled out raced around righ turn answer will different What have just described loop True maneuver performed angle th groundobliquely likebut its still loop correction thats wanted shim o positive stab incidence Recognizing fligli path what came learn di great secrets FF Power trimming good gen eral rule follow adjustment ha made since last flight engine rul should remain same put othe way around engine time can increased oni last flight safe no correction indicated Meanwhile though DTd early t save time some indication glide will hay become apparent Corrections can made th glide needed go back list se adjustments may also affect power pal tern Tail tilt circle diameter slight amount weight nose tail should needed Sometimes model will stall during th glide occasionally quite severely indica tions pointing need positive tail ir cidence Try Such adjustment often hell power pattern well Thats because di INTERMEDIATE CONTEST/SPORT SAILPLANE DESIGNED TO ALLOW USE OF FLAPS FOR CAMBER CHANGING AND APPROACH CONTROL SPAN89 INCHES WING FROFILE MODIFIED F/lOS AREA 780 SQUARE INCHES FUNCTIONS/ RUDDER ELEVATOR FLAPS WEIGHT/ 45 OUNCES AND UP MOOIFIED SCHUMAN WINO PLANFORM COMPLETE HARDWARE KIT EASY TO REPAiR BALSA/SPRUCE FUSELAGE SOUTH WiND $7495 US FUNDS plus $600 Shipping Handling Continental US MAX MILLS MODELS PO BOX 246 SARCOXIE MO 64862 417-548-6515 DIVISION OF FULL MOON DESIGNS 0 z a. 0 188 Model Aviation GOLDEN GATE HOBBIES PO BOX 27001 FRESNO CAUFORNIA 93729 M/C OR COD HA TORI TETTRA DICICON IMMSK HATORI BLUEPRINT SHOWS ALL EXHAUST ITEMS FULL SIZE 2FT X 4FT $ 5 WE WANT NEW DEALERS ! HATORI 650 LONG PIPE $4350 TO DEALERS CATALOG $ 200 OR FREE M11-I ORDERS CHECK EM ALL OUT English Leather CALENDAR GIRL CASILENGE AWK FUN FLY NEW STARHAWK BIPLANE NEW MISS STARHAWK POSTER 19 AUG RC MODELER NW 503 646-4531 PORTLAND OR 26 AUG JOES HOBBY CTR 313 933-6567 DETROIT MI 9/22123 CENTRAL PENN 717 564-3280 HARRISBURG PA See your Starhawk Dealer details write Thorpe Engineering Corporation 1715 E Fairfield AZ 85203 Poster $500 P&H Prepaid 7. A5 9 TocliO THE SCHNEIDER SPORT PORT MODEL R/C FLOATPLANE RECOMMENDED ENGINES 45/60 2STROKE 60/80 4STROKE QTF FLOATS INCLUDED LENGTH 34 IN CAP 6/10 LBS SPAN 57 IN AREA 600 SQ IN 804 8736604 STREAM INCORPORATED s BIXJE iflE C NUPOR NEWS VL 23606 DEALER INQUIRIES INVITED 4 ower run can actually get away nailer decalage angle demanded lide very effect created VIT ariable incidence tail systems fact Over period five 10 flights youll rease engine run legal limit seven conds Only full run after model reached its ultimate speed can total shape power pattern viewed Ordinarily its uite acceptable settle tight spiral ian full turn safe trim usually gives ood transition well However starting nd gradually carefully taking away ght rudder can give faster verti sI climb model thats troublesome trim outsay O flights its still rightwill invariably rove have incorrect wing warps right ing washin vital keeps right wing lift ig during climb prevent right-hand spiral ive warp excessive however can ad serious difficulties sure sign eed change wing warp model espite healthy amount right rudder tab sts upon swinging over left-roll attitude late climb Heres MonoKote cover ig earns its keep rewarp job easy rids well Readers whod enjoy learning epth article FF adjustment referred o-part series Ralph Prey July Au ust 1979 issues Model Aviation Though article over decade old principles havent changed never will Indoor WCICIemens Continued page 88 barely got watches started Banks mod el badly distorted torque fully wound motor wouldnt climb hit floor after mere 54 seconds Teammate Larry Cailliau using helium balloon reposition model during its first official allowed often effectively used under FM rules inadvertently crum pled wing sent ship spiraling slowly floor time 1241 De spite very respectable 3921 Cailliaus second effort fine 4120 number two Bob Randolph end day found American team fourth place hind Romania Japan Finland dividual standings Randolph second Cailliau 13th Cezar Banks found him self unaccustomed dead last 25th stay would brief Jim Richmond lost no time defend ing title calmly put up two splendid flights 4318 4215 both using same 040 x 060 x 20-in Pirelli motor hed flown victory 1988 FM meet seventh eighth official flights Pirelli motor some good 1982 Pirelli said Jim cranked 2250 2290 turns respec tively two flights second ship miraculously squeezed through girders during circle Official flying began 1 pm Tuesday day two Bob Randolph suffered two midairs including saw dead-sticking descent Romanias Aurel Popa snag ascending model prematurely ending good flights both contestants Reflights al lowed after such collisions no official flights lost reflight doesnt bring back high time lost collision Despite mishaps Randolph ralsed remarkable string 40-minute-plus flights four timings 4114 4046 holding second place individual stand ings 240 over resurgent Cezar Banks Banks 4105 Larry Cailliaus 3921 helped increase American teams total 24110 leapfrog first place team standings position would hold throughout remainder contest GgE hly publication covering International RC Soaring Scene USA $17 yr $22/yr 1st Class Canada/MexIco $22/yr US funds Asia & PacIfic $28/yr US funds Europe & UK $28/yr US funds Surface Mail Foreign $19/yr US funds R/O SOARING DIGEST PO Box 6680 Concord CA 94524 October 1990 189 LENGTH 47 IN iTEIGHT 65 / 70 LB

AS LONGTIME modeler returning Free Flight after 35-year detour categories CL RC initially found Rubber models appealing first Power efforts began after became comfortable Rubber Later still came Power modelsmore models success found others un doubtedly have along higher performance todays engines come faster crashes complete demolition responsecall obstinacywas dig heels persist After going through numerous models built both kits through own design efforts pattern began take shape successes came fitful tem porary good ships soon found ways wipe out primary problem seemed consistency Moreover Id needlessly concentrated elegance pro longing building time delaying author Slow-Worm next van must have acted fast have ac quired modeler license plate ahead least half other modelers Florida learning process Eventually realizing what needed model could built quickly could crashed came up prescription design would simple medium sized functional care maybe attractive no auto surfaces moderate power en gine today fits description first Slow-Worm built requirements engine selected OS Max 15 FP slightly bored take crankcase pressure hard tank burning 35% nitro turns Cox 7 x 3 prop 19000 rpm As can imagine plenty power 14-oz all-up weight beginners ship no Properly trimmed model will three minutes seven-second run rather thats what does expect itll havent stopped learning course has Slow-Worm got over comprehen Slow-Worm 432 Want learn fly Free Flight Power wont find simpler hot competition ship 09-15-powered 54-in-span 14-oz py lon job helpful mentor trimming flying author U Dave Platt Left The engine-timer-tank setup authors 432-sq-in version engine 05 Max 15 FP swinging 7 x 3 GF Prop Note simple pylon Right building process always faster easier accurate first kit project shown 78 Model Aviation author holds Slow-Worm against sky backlighting translucent MonoKote cov ering give some idea appeal Free Flight Dave says hes built Slow-Worms little day Before passing water-cooled X-Acto knife check temperature Left The stabilizer under construction Because author uses glass-topped worktable employs weights rather pins hold structure flat against plan Note plastic wrap between frame plans Right structurally complete stabilizer Its light weight strong rear geodetIc ribs gussets resist twIsting great feature using heat-shrink covering material sion hump Free Flight Power al lowed move Together few friends Ive built model gamut sizes great little 300-sq-incher aTee Dee 09 onuptoa l190-sq-in hum mer Rossi 60 engine have proven easy adjust quickbuildingsome single day Want make Its simple cut parts two youre Construction notes follow rather minimal touching upon impor tant points Slow-Worms structure sim ple plan self-explanatory After get ting building out way want concentrate trimming flying mod el Wing Make main spar first Cut four lengths hard balsa stock three shorter pieces harder stuff braces Assemble spar over full-size front view Sand bottoms braces level underside spar Relieve three A-in-thick ribs dihedral braces ribs also relieved /16 center section sheeting Glue center A-in rib spar an gle bisecting dihedral angle fron tal view perpendicular plan view same two A-in ribs polyhedral breaks Set assembly over plans build rest wing panel time Youll notice cutting joining leading trailing edges spars center thick rib far easier building separate panels trying mate accurately Frankly its method always use building someone elses design doesnt call Fuselage engine mount may terest Ive used style mount engines up 60 always works well Its light functions engine unlike commercial mounts always avail able need mount also holds skid nicely Caution certain get fuselage straight dont youll have correct later work rest fuselage structure like tail simple enough require no further description Covering Ill confess being snob modelwise Instant hobby products offend Ive always used traditional covering materialssilk Japanese tissue nitrate dope etcand still things have discovered though MonoKote has great advantages used FF Power flying surfaces Among ability retain warp rewarp out creeping priceless consistent results gives MonoKote has greatly helped achieve consistency trim models have surviving much longer just materials virtues recommend MonoKote wings stab regular covering tissue silk glass cloth fuselage Trimming moving RC FF mod els came learn essential difference between two RC hobby dexter ity FF hobby reasoning being found myself hungrily absorbing decent article could find FF model ad justment FF model appearing mags would find quickly turning trimming section Man dont just hate article says Try hand October 1990 79 simple strong effective engine mount landing gear attached Its easily quickly made can built adapt almost engine configuration fuselage being built over plan photo its about halfway finished black strip visible side panel strip 007 x /4-in carbon fiber Its shown plans greatly strengthens fuselage little no weight penalty structurally complete fuselage pylon ready covering engine mount place cutouts timer fuel tank complete Note strong landing gear wire --I --m---r cz II GUSSETE EVOM IRt 4$GB ASACE- Ta- FE 3 i LEFT CENTER PANEL FLAT no WAI UNDSS C0VSTSUC rip qfl SISMEESSSTAB TIP RIB WG Movar 4ax 2 PRUCE C04U43 TED 000CC else tAfl 5 5/3* ~ 5/IS & FELON PI4RTS III -----4DfltUSfl TOM Ak ESS/ME USED-os-. rz-wr sLOw-1JJORm 432 *140 POADS ST 0500 MATE I L#GNTIES#SMT CLASS POkIER FOR Nor 09 I FUSELAGE CROSS-SECTION rO Snr isSBUS 5 AREA 435 wIT AT o IIS lIMES INFUEC TANKNOWECSNUFFER TUBE SefliT IN TUB SICK 505K CMEETS a/3 SNT --t0~DTFUSS -~SNUFFSR TUBE S/SE MOUNTPT BAND glides go power flights have mastered intricacies FF Power adjustment can skip part Im certain other begin ners out need stuff Heck anyone can build darned thingsespe cially Slow-Worm Getting fly right skill art fun found Im going make two specific recoinmendations help out first youve doubtless seen times already Pay careful attention preflight checks really second bit unusual Take text you go flying Reading model does so adjust thus such isnt going help unless have need Youre going remember small details effects etc un 5 less have words right elbow Take magazine Preflight check consists trying blueprint airplane just would blueprint engine optimal perform ance Check CG center-of-gravity course Thats fundamental Make sure its exactly marked adding lead nose tail must get right Check Left wing begins take shape main spar being assembled positioned first Right left center wing panel nears com pletion Note 1A-in-thick ribs being employed dihedral break heavy-duty gussets side rib trailing edges 80 Model Aviation tSn PASTS 40505 sow LAGE conSWUCroN *4 4ft USOSESOTEGI FUSELAGE COPSTRNCflON K1-J 400L NK FRON 2 FUS TCPATE Full-Size Plans Available. Page 194 __I__ I_-- 1KitPRC BUILT$s Rio $oiSIIToPSAR IAIA ffn sea weelOSS NAIOSPAG $ x iM- /44CC FUSTi 01/CO flitS DRAW Ode - / RiGor crmrg .vEc wes i/s WASH/n Ce ci WASP C 14 o ~--------t---~ Se/S 4/500 - ltN 06 Ar saso 0 s//F TOPSTAB NAIOSSAB 15 1/I/A cc 4/Is w s/aCo-carrHa-vEprOdsossers sot StOCk FCC / CS iNDICATE position oc Cd//ICE BUILOIPJS COT-DO NH NYLON 5000CRi/OEM ANCHOR FOR BOOSTER - I AND -Th - Th Z OP LJAE SO/GEFUSELAGE ooes /t& S*flh mc GOTTOSE FaRMERS s/so 0 5/5 ICCO // s/os tori F/P PANELS save Vs WASHOUT Ta cc WiNGOIB 04 $6 C I/ BAils STAB BEAR RIBS TO AgSPSIL STAB BIBLET i $6 2 tEa ftR PLY K S/ETCH SNOWiNG POWESi TI/SN TRIOS WEDGE OWOOI 450 7/pASS/c77//S Il/IRE RETAiBESFE STOCK SERTICAC F/N 5/3* SOT tirI -ri--/- lFI ii \ Jt-Sb DOWEL FOR STAB SANDSliiIIV1 AC FvOcTT11TN iI JHOCE/N75P111C/NDERF/N S SOT Dr C/NO -- COUNTLAND $AICSOA 20 rsr AT/DPI OF fl/BE DETER/A/NE S TIP ANGLE 45 WANTED Os HARDWOOD AS /AOI/NTS /i GLUE tOft/S TI/ 40 F/LF IfiJi wing warps agree plan callouts Glue keys underside wings next wing mount ensure con sistently accurate wing alignment As measure wing tip fin making sure wing square fuselage same stabilizer Thrust line okay Fin straight Lay straightedge along pylon back fin check alignment Most people also tell check incidences wing tail Im going totheyll ad justed during flight testing later anyway Run engine see timer working right Try out DT dethermal izer two three times check tip-up gle too Lastly look tail tilt must come close four degrees indicated plan Alright lets go fly Flying Now field theres something want share call alarm bell theory works way make adjustment model doesnt respond should alarm bells start ringing always course its just used ignore Result crashed airplanes Now listen something abnormal unexpected Continued page 184 Left center panel supported correct dihedral angle tip panel built over plan attached directly center panel Right completed wing ready final sanding covering little practice wing can built point about two hours October 1990 81 5I2345 BOB HOLMAN PLANS best scale 29 years Plans tram Englands leading scale modeleliers have plans have won everything BEST Show Toledo World Scale Meet Masters Plans Brian Taylor Dennis Bryant Thorpe BROS leading British magazines Catalogs Best Scale $500 Model Aircraft plans Handbook 1989-90 $500 Scale Drawings Plans Handbook $500 RC-Model World Plans Const Guide $500 Catalogs $400 3 shipped togethar order Please donot buy glass FW 190 Kit untill check quality glass work Bob Holman Kits Call BH 714 885-3959 Spit MK 1 69 AfPi Plans $2500A essories $6000 Shipping Messerschmitt 109E 68 Plans $3500 Accessories $6500 Shipping $500 Hawker Hurricane MK Plans $2500 Accessories $6000 Shipping $500 Dornier 17z 74 Plans $2400 Shipping $300 Heinkel 111 74 Plans $3100 Shipping $300 Ju 68 72 Plans $2250 Canopy $1000 Shipping $300 Messerschmitt BFI1O 71 Plans $2500 Accessories $2500 Shipping $500 50th ANNIVERSARY BATHE 2 CG center-of-gravityfore/aft balance point model complete rubber motor 3 Stability marginthe distance between CG AC expressed percent wing chord 4 Tail moment armthe distance measured tween 25% chord points wing stab CG location CG must always ahead AC shown model stable works like models weight acts down ward through CG aerodynamic forces act upward through AC model equi librium flight forces exactly balance model noses up aero force increases enough bring back level flight nose-down condition aero force reduces allowing tail drop distance between CG AC margin leverage aero forces have restore level flight margin drops zero model will have neutral stability will go whatever direction pointed until some outside force diverts CO behind AC model unconditionally unstable nose comes up will continue rise What about too much margin model has very high positive stability margin two undesir able things happen 1 The stability high little can stop After contact between outboard wing tip curved ceiling beam model chugs along turning obstruction invariably hangs up slides down curve optimum mar gin overwound model tends stall turn torque away obstacle con tinue flying 2 The angular difference between wing stab greater giving higher drag power required both climb cruise flight speed higher time high mar gin can help highly turbulent air higher speed helps model penetrate better Outdoor models correct stability mar gin fixed adding weight nose tail adjusting trim fix glide wing Indoor model can properly located respect CO possible set cruise trim new model almost perfectly few two test flights Once margin trim set always fly model same weight rubber used find its CG ballast plane keep same CG location Worlds lightest timer Two photos show works Stan Chiltons gear-retraction mech anism record-holding ROG Stick model shot shows top view retracted gear hinge mechanism other side view stop timer Well can see stop timer too tiny see tiny piece double-sticky transparent tape hinge mechanism both pivot torsion bar retracts gear Stan cocks timer using pair tweezers tape holds couple minutes Al though CO shift gear retracts model very stable shows no apparent ef fect retraction long last photo shows Jim Clems interesting experiments inspired rash loooong Federation ROOs Federa tion ROG no officially recognized AMA classEd prototype version 39 long overall proved slightly unwieldy Jim won individual honors Federation ROG USIC flying 34-in version 751 flight long ones seem fly just about like shorter ones except may have higher potential duration Slow Worm/Platt Continued page 81 happens find Out immediately Lets toss plane once want nice fin glide too close stall models teni toward stally glide get up ani out ground effect should tendenc turn right too pronounced though just tendency model too slov stally add shim under stab leading edge glide too fast divey add shim un der stab trailing edge Precut some hims same size forward stab mount put field kit ua glue place dont want crashed ship over shim compressed fel out Repeat tosses until glide looks good about turn doesnt match abovi descriptionalarm bells Find out th fuselage fin bent misaligned will affec glide circle must corrected youl never get ship flying properly higl speed power flights bring Lets say glide circle okay clos4 enough minor adjustment stab tilt gle fixed means can proceed ha next stage first power flights Set DT want about 20 30 sec onds point Set engine timer abou three seconds Start engine adjusting fo] slightly richer leanest setting Hold thi model around fuselage behind pylon aim dead wind about 80 up trip ha Continued page I8 iXX xxxxxxxxxxxx FREEDM 9O ONLY MUFFLER$1295 xEasily attached 25 108 size engine xsilencers FREEDOM 90 Muffler gives XAMA recommended 90 dBA 9, silencing Xnoise noise cornlaints Ensure X freedom fly Unchwlenged through 90s x FREEDOM 90 X Tested qualified US published engine reviewer Silences 50-98% engine noise WITHOUT POWER LOSSI Uc US SNUF-LER Patent #4858722 \I1SA AND MASTERCARD 1-800-NOW GO RC accepted Add $2S0 far 660-4872 I 2 weeks delivery time Made America II American Technology IdODa. ENGINES RJL Manufactures USA RJL R/C & U/C ENGINES 15 thru 61 Forster Glow & Ignition Engines FACTORY PARTS & SERVICE FOR HB Engines Cox Conquest 15 Kraft 61 Taipan 40 HGK Engines Testor/McCoy Series 21 Forster Remco Viking twin Call er wrre far free information RJL Industries PO Box 5 - Sierra Mack-e CA 91025 818 359-0016 AttT7i 4 BRITIAN COLLECTION Slow Worm/Platt Continued page 184 timer let go utmost observe flight let excitement noise distract Before get what model did lets talk about what want looking steep upward spiral right under power Imagine spring pulled almost straight youre seeing what want now talking about power pattern tran sition glide dealt later Did plane show initial part path described fine Skip couple par agraphs lets see what model did stead likely scenario After climbing fairly straight first airplane veered left roll engine stopped adjust ment small wedge right rudder answer its necessary detail ex pected effects various adjustment options open us Its equally necessary builder begin understand effects some expert eyewitness merely telling what will have no lasting benefit Lets look list Rudder effective during sec ond half power run say threesecond point As speed increases effect creases Small wedges used power adjust ment have little no influence glide Wing warp Similar rudder effective ness rises extra speed provides roll couple yaw Slight effect glide What lit tle makes model glide toward washin typical pylon models including Slow-Worm means right what want anyway Side thrust/downthrust Used correct direc tion during first two three seconds power run Effect diminishes during acceleration drops zero full speed Incidentally effectiveness thrust line adjustments no near great Power ships rubber-powered jobs Slow-Worm Ive ever seen has needed degree two left thrust downthrust seems have strange undesirable effect producing nose-up jump engine stops Therefore avoid possible Tail incidence positive negative will influ ence both power glide influence peaks during power run since speed greater Tail tilt will control size glide circle tilt smaller circle model turns toward high side stab Little no effect under power because tilt works under high-lift conditions During power run gle attack thus lift stab minimum CG shift critical adjustment affecting bott power glide Change CG im perative Most kit plan models have opti mum CG position marked will fly well trim Looping sign CO too far ward too far aft CG will cause model have slow no recovery dive point motor-cut during glide Lets get back Slow-Worm just made its first flight reason need rudder trim wedge wing warp effect left ai leron eventually overcame right turn ten dency shared pylon models due slip stream pylon happened speed got point wing warp became powerful force work Thus need right-turn adjustment like warp must increase its effectiveness speed answer rudder wedge way dont use rudder trim tab wedge glued onto rud der may look quite nice has ad vantage being controllable great precisios simply varying length Anyway arent static points FF other hand model showed ten dency fly too much right other correc tion needed did immediately prob ably need rudder wedge left side thi fin model climbed satisfactorily first leveled out raced around righ turn answer will different What have just described loop True maneuver performed angle th groundobliquely likebut its still loop correction thats wanted shim o positive stab incidence Recognizing fligli path what came learn di great secrets FF Power trimming good gen eral rule follow adjustment ha made since last flight engine rul should remain same put othe way around engine time can increased oni last flight safe no correction indicated Meanwhile though DTd early t save time some indication glide will hay become apparent Corrections can made th glide needed go back list se adjustments may also affect power pal tern Tail tilt circle diameter slight amount weight nose tail should needed Sometimes model will stall during th glide occasionally quite severely indica tions pointing need positive tail ir cidence Try Such adjustment often hell power pattern well Thats because di INTERMEDIATE CONTEST/SPORT SAILPLANE DESIGNED TO ALLOW USE OF FLAPS FOR CAMBER CHANGING AND APPROACH CONTROL SPAN89 INCHES WING FROFILE MODIFIED F/lOS AREA 780 SQUARE INCHES FUNCTIONS/ RUDDER ELEVATOR FLAPS WEIGHT/ 45 OUNCES AND UP MOOIFIED SCHUMAN WINO PLANFORM COMPLETE HARDWARE KIT EASY TO REPAiR BALSA/SPRUCE FUSELAGE SOUTH WiND $7495 US FUNDS plus $600 Shipping Handling Continental US MAX MILLS MODELS PO BOX 246 SARCOXIE MO 64862 417-548-6515 DIVISION OF FULL MOON DESIGNS 0 z a. 0 188 Model Aviation GOLDEN GATE HOBBIES PO BOX 27001 FRESNO CAUFORNIA 93729 M/C OR COD HA TORI TETTRA DICICON IMMSK HATORI BLUEPRINT SHOWS ALL EXHAUST ITEMS FULL SIZE 2FT X 4FT $ 5 WE WANT NEW DEALERS ! HATORI 650 LONG PIPE $4350 TO DEALERS CATALOG $ 200 OR FREE M11-I ORDERS CHECK EM ALL OUT English Leather CALENDAR GIRL CASILENGE AWK FUN FLY NEW STARHAWK BIPLANE NEW MISS STARHAWK POSTER 19 AUG RC MODELER NW 503 646-4531 PORTLAND OR 26 AUG JOES HOBBY CTR 313 933-6567 DETROIT MI 9/22123 CENTRAL PENN 717 564-3280 HARRISBURG PA See your Starhawk Dealer details write Thorpe Engineering Corporation 1715 E Fairfield AZ 85203 Poster $500 P&H Prepaid 7. A5 9 TocliO THE SCHNEIDER SPORT PORT MODEL R/C FLOATPLANE RECOMMENDED ENGINES 45/60 2STROKE 60/80 4STROKE QTF FLOATS INCLUDED LENGTH 34 IN CAP 6/10 LBS SPAN 57 IN AREA 600 SQ IN 804 8736604 STREAM INCORPORATED s BIXJE iflE C NUPOR NEWS VL 23606 DEALER INQUIRIES INVITED 4 ower run can actually get away nailer decalage angle demanded lide very effect created VIT ariable incidence tail systems fact Over period five 10 flights youll rease engine run legal limit seven conds Only full run after model reached its ultimate speed can total shape power pattern viewed Ordinarily its uite acceptable settle tight spiral ian full turn safe trim usually gives ood transition well However starting nd gradually carefully taking away ght rudder can give faster verti sI climb model thats troublesome trim outsay O flights its still rightwill invariably rove have incorrect wing warps right ing washin vital keeps right wing lift ig during climb prevent right-hand spiral ive warp excessive however can ad serious difficulties sure sign eed change wing warp model espite healthy amount right rudder tab sts upon swinging over left-roll attitude late climb Heres MonoKote cover ig earns its keep rewarp job easy rids well Readers whod enjoy learning epth article FF adjustment referred o-part series Ralph Prey July Au ust 1979 issues Model Aviation Though article over decade old principles havent changed never will Indoor WCICIemens Continued page 88 barely got watches started Banks mod el badly distorted torque fully wound motor wouldnt climb hit floor after mere 54 seconds Teammate Larry Cailliau using helium balloon reposition model during its first official allowed often effectively used under FM rules inadvertently crum pled wing sent ship spiraling slowly floor time 1241 De spite very respectable 3921 Cailliaus second effort fine 4120 number two Bob Randolph end day found American team fourth place hind Romania Japan Finland dividual standings Randolph second Cailliau 13th Cezar Banks found him self unaccustomed dead last 25th stay would brief Jim Richmond lost no time defend ing title calmly put up two splendid flights 4318 4215 both using same 040 x 060 x 20-in Pirelli motor hed flown victory 1988 FM meet seventh eighth official flights Pirelli motor some good 1982 Pirelli said Jim cranked 2250 2290 turns respec tively two flights second ship miraculously squeezed through girders during circle Official flying began 1 pm Tuesday day two Bob Randolph suffered two midairs including saw dead-sticking descent Romanias Aurel Popa snag ascending model prematurely ending good flights both contestants Reflights al lowed after such collisions no official flights lost reflight doesnt bring back high time lost collision Despite mishaps Randolph ralsed remarkable string 40-minute-plus flights four timings 4114 4046 holding second place individual stand ings 240 over resurgent Cezar Banks Banks 4105 Larry Cailliaus 3921 helped increase American teams total 24110 leapfrog first place team standings position would hold throughout remainder contest GgE hly publication covering International RC Soaring Scene USA $17 yr $22/yr 1st Class Canada/MexIco $22/yr US funds Asia & PacIfic $28/yr US funds Europe & UK $28/yr US funds Surface Mail Foreign $19/yr US funds R/O SOARING DIGEST PO Box 6680 Concord CA 94524 October 1990 189 LENGTH 47 IN iTEIGHT 65 / 70 LB