Key Design Elements Larry Driskill SLOW COMBAT probably intended simple event rules call profile fuselage suction fuel system What could simple Slow Combat intended well slow enough us mortals follow action Slow Combat speeds remain slower AMA Fast Combat However often case restrictions Slow rules did result simple event has continuing trend toward complexity both airframe design engine/fuel system arrangements Fast Combat Fox MK III IV using simple pacifier pressure tank will pull almost design faster us can comfortably fly match other hand quest tightturning quick Slow Combat setup has proven difficult Build light tightturning airplane fuel-feed gremlin will climb aboard shut off power make fancy outside maneu ver Reduce venturi area gain stronger fuel draw goes top speed Successful top-of-the-line Slow designs often sophisticated require testing development comparable Fast designs Examples sophistication chicken hopper soft bladder tanks replaceable wings Phil Cartiers SC-2 tall engine venturis Fox MK IV 36 BBCL flaps Marvin Dennys Flat Iron 1983 FAI Combat Team Trials observed wings several models flex ing couple self-destructed high-G maneuvers Geophysicals distinctive feature geodesic wing structure solves problems As well being lightweight Slow Combat design Geo would make distinctive Stunt trainer sport design John Huntons part article covers construction tasking bit less specific Ill start prop work back explanation key ele ments incorporated Geo design Ill 72 Model Aviation Top Picture Geophysical R appears have just clipped about half opponents streamer Slow Combat important make small cuts rather take oppon ents entire streamer no kill scoring Left Larry Driskill Oco Note asymmetrical flying stab helps provide good line tension minimum tip weight Right Co-author/designer John Hunton uncovered Geo Wing panels tem porarily fitted fuselage Construction lightweight also very rigid strong lxi 4 Above Silhouette view wind flier R sparked idea geodesic Slow Combat design prototype Geophysical L Right full-size plans may ordered Include tem plate sheets 1/16 sheet baisa components wing templates adhered sheet balsa spray adhesive way can transferred several times panels wouldnt think model complexity could competitive CL Slow Combat model flier Larry Driskill believes several approaches get top Slow Combat pyramid design has features helped him win third 1984 National Contest addition authors note excellent sport flier U Larry Driskill John Hunton also share bit Combat philosophy Propellers Although Combat fli ers want go fast Combat purely speed event believe Combat prop should look like Stunt prop like speed prop starting point try 9 x 6 9 x 6A 9 x 7 medium-blade props Engine Geophysical designed Fox 36BBCL MK V long crankshaft allows engine mounted closer wing still complying 5-in nose rule Besides being readily available inex pensive engine has advantage tall intake stack helps ensure good fuel draw try stay away radical timing modifications reduce reli ability Suggested modifications 1 double bubble head button Virginia Craftsman 348 Argyll Circle Highland Springs VA 23075 2 Supertigre needle valve assembly 3 general cleanup ports passages have engine apart extend oil groove crankshaft journal toward front case few very shallow scratches will help prevent galling frontend wear Fuel system two popular ways go 1 soft bladder balloon tank such successfully used Jaden Wooten 1981 Nats 2 chicken hopper type metal tank such sold Triangle Hobbies 1211 Brookgreen Dr Cary NC 27511 bladder lighter may allow larger venturi opening however Ive experi enced consistent performance metal tanks Nose structure Dont eliminate Y1 sq hardwood spreader ties upper lower engine mounts together Slows long noses heavy engines often suffer vibration problems vertical maple spreader helps stiffen front end Spars carbon-fiber reinforcement highly recommended Weight gain negligible strength greatly creased Ive used both 007-in sheet ribbon type success Glue epoxy cyanoacrylate CyA Center gravity Built according plans Geo will probably come up nose-heavy 5-in-nose rule leaves us choice long tail moment tall weight Ive opted tall weight use flat sheets lead bolt 4-40 bolt nylon insert nut way can easily adjust center gravity CG until airplane trimmed suit flying style Bellcrank Use heavy-gauge alumi num bellcrank such large Fox Nylon bellcranks will work openMay1985 73 Left Wing panels can assembled quickly cyanoacrylate adhesive directly over plans Light 1/16 sheet balsa used wing construction Above completed inboard wing panel outboard panel identical except has tip weight no lead-out guides Photos article Bernie Stuecker Full-Size Plans Available. See Page 172 TRAILING EDGE-N --___ mzZILZ7 j-l/BxI/4PARTIALAS /I/4xI/4MAIN SS 27 LEADING EDGE /2 I/2~ TYPICAL GEO-WINS PANEL LINE OF LE BEFORE TRIMMING -END DF007 GRAPHITE NOTE-TRIM LE SPAR REINFORCEMENTTO 3/B RADIUS SPAR NOTCH DETAIL_ PLY V21 NOTE- DO BELLCRAN Ifj NOT USE MOUNTLITEPLY 12 REOD LINE OF PROP CUT WING OU BACKPLATE TO AS REQUIREDOUTBOARD WINPANEL BE 5 MINFOR TANKBALSAMOTION TO LE OFLE IS NONLIMIT WINGISTRUCTURAL 1/16 PLYW 0007 / I/8DIA SOLDER OUTBOARD WING ONLY 9 LEADOUT #GUIDES 4INBOARD WING ONLY 23I NOTE- PART NUMBERS ND ICATE ORDER 35 OF ASSEMBLY OF WING 36 NOTE- OUTBOARD ELEVATOR IS LON GER THAN OTHERA RUBBER TUBING RET I/B QD TUBE - 3/32PLY~ ASSEMBLY GAUGE CAN BE USED TO HOLD JOINTS TRUE FOR ASSEMBLY WITHOUT PINNING 1 ji1 AL j BAtS I - -- ---- -I~RNI Lr9ASOLDER WASHER TOP VIEWI/8DOWELGRAPHITEI TUBEFILAMENT I/2BALSASPAR REINIIOARD WINIIANEL FAIRINGFOR HOLE FOR HOLE FOR GEOPHYSICAL COMPETITION SLOW COMBAT DESIGNLARRY DRISKILL JANUARY 19B4BALLASTSTREAMER JOHN HUNTON ing fuselage may have en larged Set controls pushrod inner hole Fox bellcrank %-in offset pivot bolt helps desensitize controls airplane will stay put youre looking opponents streamer Elevator removable flying stab/ elevator allows replacement eleva tor damaged match As bonus can adjust total elevator throw moving pushrod up down control horn feature together adjustment Z-bend pushrod changing relative amount up/down movement eliminates need adjustable connectors subject failure Increased complexity can mean creased building time expense Faced similar problems fighter aircraft procurement USAF opted mix F-15 F-16 fighters Combat fliers might try same sort fix mix scratch-built wood models such Geo kit/foam models Eagle Slow Triangle Hobbies SC-2 Core House Box 300A RD #2 Palmyra PA 17078 Phantom Competition Corner 101 Forest Dr Advance NC 27006 competitive designs can built quickly Its nice have superior equipment Combat shootout However important ingredient winning Combat combination pilot better pilot 74 Model Aviation ROOT RI Left Elevator temporarily assembled fuselage Note Z-bend pushrod exits canopy easily adjusting pushrod length Above fuselage sembly ready installing wing Note rudder placement bottom fuselage pushrod exit rear canopy Holes 1/4-in carrythrough wing spars evident Fuselage sides 1/18 plywood strength rigidity 0 U 0 U2D 0 on0 U 0 0 0 0 2L WIno Z0 I- ZI L 0 Jaw BC E nIb LaIn La0 5 U ILa r La ua 0I LaIn 2I nI -z LaIDI- mm ICOAT BACK OF PAPER TEMPLATES WITH SPRAY IGEG-WI NGMARK IApHSIvE WHEN DRY PRESS TEMPLATE TO /1611 I4dB SHEET BALSA RE-USE TEMjA1CIJIOUT will win majority close matches Beyond assumptions would guess 20-25 Gb matches won getting air borne first Another 20-25% lost taking whole streamer pass Its always good plan airborne first superior equipment avoid greedy tendencies youre lined up other guys streamer Design Construction Details John Hunton Geodesic construction has appeared peripherally model aviation particular ly Free Flight light rigid construction great importance working years development wind-powered whip models using geodesics same reasons Larry Driskill saw wind model inquired would possible apply construction techniques well-developed Slow Combat designs Geophysical result Larry Driskill pilot USAF presently flying U-2s flew Cessna O-2s Nam has flying Combat years typical good flier also flies other events competition Combat however won first Fast third Slow flying Geo other models 1974 National Contest has won other meets Larry ranks fourth MACA Benefits geodesic wing Geo wing design begin excellent torsional rigidity permits lighter overall structure Geo-wing panel half span will weigh under 2 oz balsa selected properly prototype wing tested uncovered over 25 Gs presuming 24-oz model Since wing structure rigid torsion D-tube leading edge typical needed Without D-tube structural elements necessary carry through fuselage stub spars also simplifies fuselage wing panels can built separatelyconvenient construction wing panel replacement rigid wing panel permits lightweight covering materials used since covering non-structural end result lighter tighter-turning model Another unique feature Geo physical design offset horizontal stabilizer ensure proper line tension during maneuvers traditional solution has provide weight out board wing tip counteract weight control lines extend board wing span increase lift side causing slight bank toward out side circle thereby using wing lift increase line tension problem classical design solution increasing wing area lift board wing drag also increased outside causing model yaw toward circle negating some desired benefits causing model fly untrue offsetting elevator outside circle outward-rolling torque created asymmetric negative lift no negative lift drag centered elevator drag lift outside circle compared larger inboard wing reinforcing other effect using philosophy wing tip weight can reduced further Continued page 78 John Hunton launches Geophysical Tie-wraps used hold fuel tank securely fuselage providing easytank removal replacement Geo would excellent sport model Stunt trainer adding single-wheel gear much tame engine FULL LINE OF ELECTRIC SYSTEMS & Parts Avail SHIPPING & HANDLING 64 Page CATALOGUE Up $800 add $150 $200 PP/isO Class $801 $2000 add $225 copy will sent $2001 $0500 add $300 free-when requested $1501 $7000 add $350 order over $7000 add $000 HOBBY HORN CA Addressees add 6% las15173 Moran St Send MO Visa/MC6--ExpPO Boa 2212 Check allow up tO 30Westminster Ca 92685 days CK clearance 714 8030311 GOD Esact Charges Hdl Cash Only[Aft Hrs 710 89512031 lightening model Building Geo-wiag plans include templates parts build pair wing panels following materials required four sheets x 4 x 36 medium balsa two / x / x 36 hard balsa main spars two / x / x 36 hard balsa spar doublers /2 x /2 x 36 soft balsa leading edge 1/ x / x 18 hardwood carrythrough spar cyanoacrylate glue covering material choice Cut full-sized templates 4-in-wide strips Spray back templates spray adhesive let dry Press templates /16 balsa sug gest have second set balsa sheets handy As cut out parts through templates transfer templates next sheet balsa way can cut out several sheets parts set templates instructions based use cyanoacrylate CyA glue Use thin quick-curing type initial assembly finish thick CyA fill gaps Cut out parts being particularly careful cut rib slots accurate width depth Cut x hard balsa main spars same length trail ing edge parts No 11 12 Notch spars mid-depth 5 end 5-in length spar will removed later step Cut /2 x soft balsa leading edge /16 longer spars Cut four x partial spars extra long trim later Lay wing plan flat work board Cover plan waxed paper pin main spar over plan notch down toward root wing Assemble ribs No 1 2 3 4 spar rib slots up tack-glue ribs spar Add ribs No 5 6 7 8 9 assembly gluing slip rib No 10 Press other main spar place notch up toward root tack-glue place Block up trailing edge part No 11 under trailing edges wing ribs temporarily leading edge part Glue trailing edge place Install other trailing edge part No 12 glue rib intersections Install first root rib part No 13 Attach Ribs 5 10 root rib install tip rib parts 14 15 16 Attach leading edge Ribs 13 14 allow ing project beyond Rib 13 Accu rately align root rib plan attach diagonal rib leading edge wing can now removed bench final assembly Install half-ribs between spars leading edge beginning part No 17 near root continuing through part No 22 Now glue re maining diagonal ribs leading edge Install tip bow part No 23 tip trailing edge parts No 24 25 Glue part 26 spar spreader root ribcentered spar slots Enlarge spar notches ribs No 1 13 install partial spars tackgluing ribs portion main spar remain Remove 5-in portion main spars Install spar gusset parts No 27 28 sheeting parts No 29 30 root rib brace part No 31 Add root sheet parts No 32 33 trimming required Sand root rib flat block sand er except projecting leading edge glue root rib part No 34 crossed grain other root rib Add tip reinforcing parts No 35 36 Go over joints CyA glue Shape leading edge full-round %-in radius sand entire wing smooth long sanding block Trim out webs root ribs Install lead-out guides inboard wing tip weight outboard panel Cover wing Wing pairs should built opposite hand build front plans back ensure geometric symmetry Fuselage tail Basic material list % x Y8 x 9 hardwood engine bearers Y x Y x 36 medium balsa longerons Y x 2 x 9 medium balsa fuselage filler two A6 x 2 x 24 plywood fuselage sides x 2 x 12 plywood sheet bellcrank mounts fin x 2 x 12 medium balsa nose fairing 4 x OD brass tube slip-fit music wire 5 long x 6 dowel stock fuelproof finishing materials choice engine fuel tank sturdy bellcrank A-in music wire pushrod Gluing fuselage parts can accomplished economically using white glue aliphatic resin provide struc tural bond CyA through white glue speed assembly After applying thin coat white glue both sides joint apply spots CyA clamp parts together firmly joint will bond very quickly Cut % balsa fuselage filler shape longerons engine mounts Assemble engine mounts longe rons filler Check fit engine add hardwood spreader cutting accurate length Cut out % balsa tail block Pull longerons glue joints Cut % balsa longeron spreaders length Drill pushrod install Install balsa fairings ahead engine mounts Sand sides fuselage sub assembly flat Drill hole pushrod exit use heated wire have long drill Joggle belicrank end wire pushrod install fuselage Glue fuselage sides Drill engine install blind nuts fairing side mounts Cut A-in balsa fairing wing outline glue place Sand shape Continued page 170 78 Model Aviation Hoiiv Horn Old Timer _ g1t 1 II1014255 8 005 OODEL /l/1odL t7LCE ReeSRO 8EaetR 1901 BROOKLYN DODGER 56 Cabins*s*SNEWESTS Retail $52 95**INTRODUCTORY PRICE5 $3900 1938 Record Breaker 96 $6956 l939Zipper5O$5356 1930 KIsucI King 63 $0230 1901 Brigidier $6 $0076 1901 Super Guaker 78 $3276 1900 So Long 5tS3036 1936 Buccaneer 80 $5996 1938 Clipper MKI 72$0158 1937 Dallaire 108 $75 16 1935 Miss America 85 $7196 1901 Playboy Sr 80 $5116 1901 Playboy Jr 50 $31 16 1938 Powerhouse 86 $53 56 1900 Sailplane 70 $0076 1938 Trenton Terror 72 $0076 1900 Ranger 0653196 1930 Korda Wake 00 $1916 1939 Mercury 72 6 kits qualify fur SAM events FE H/C feature highest quality wacodne cut & sanded parta Superior Competition alt sheet strip wood wire 6 window material Plans orig EF models easily convertible 2ch H/C KITS Sailpianes Electric power Gas Hobby Horn SENSOAR Glider 78 Ss $1000 Midway Msdel GNOME RIG Hand Launch Glider$2000 Jolly Models FLINGER R/C HLG 58 Span $2000 Midway Model FAST EDDIE Acrobatic /05 EIec$1900 Jolly Models ELECTRICUS Electric Glider 00s$3250 Leisure PLAYBOY SR 67 Gear 05 Elect $3000 Astro ASTRO SPORT 37 Direct 05 Elect $2250 Leisure WASP 37 Direct 05 Electrics$2250 Midway ULTRA MK IV 06 Geared 00 PP $3900 Midway FLYING QUAKER 00 00055 stroke $8076 Oks/Midway DENNY JR 72 Alum Cowel$8390 55 lEli-i..y BUZZARD pn~e 1 A6 Slow Combat model has terrible engine runs youre sure isnt fuel engine suspect tank Ive got hot tip Bob Nicks Triangle Hobbies makes various size tanks becoming standard Slow Combat also sells Eagle Slow Combat foam cores plans assort ed other Combat goodies Write him 1211 Brookgreen Dr Gary NC 27511 call 919 467-6720 several other manufacturers Ill mention later columns Charlie Johnson 3716 graham St San Diego CA 92109 619 273-6530 Geophysical Driskill-Hunton Continued page 78 fuselage add fin stabilizer parts fin should mounted slot Install bellcrank mounting plates Install hardwood dowels engine mount crosspiece bellcrank mounting plate limit bellcrank travel rear wing pin Cut elevator parts shape join Sand elevator smooth airfoil shape Apply light giass cloth center section elevator CyA Install hinge tubes epoxy using filament tape reinforcing Finish fuselage elevator assem blies fuel-proof system Make effort keep nose light since tail weight will probably have added make model balance properly Install bellcrank 0021 leadouts Lead-outs can fished through wing piece wire Install elevator elevator horn Joggle rear end pushrod extra jog fine adjustment Install engine fuel system Cut hardwood stub spars length slide fuselage Pre-fit wings can get carbon-fiber material slide %-in-wide piece over stub spar extend 3 onto main wing spar Use CyA anchoring carbon-fiber wings fuselage carbonfiber material available coat joining surfaces epoxy assemble wings Balance model center gravity approximately / ahead center main spar can make controls responsive adding weight tail moving CG rear ward small increments Geophysical light responsive flying skills rusty building sport-stunt trainer begin CG well forward slower con trol response Combat trim hands experienced flier like Larry Driskill Geophysical awesome Blimp/Warner Continued page 85 course ready come down Pedalling tends tire novice easily mentioned earlier found really too crazy about heights though flying has never bothered least before case thrill never forgotten As morning progressed wide vane ty experienced novice pilots took blimp spin Gallagher Bill Charlie Brian couple other old hands certainly rig well hand could make go exactly wanted Newcomers like wife Phyllis Bills 1 2-year-old nephew George lady ran kindergarten tcok first flights mastered ship loved minute Peripatetic Raindrop name registered ultralight aircraft flying weight 1 lb probably lightest ultralights world According Brian Allen ship . ludicrously easy train someone four times strong anything else Besides says Brian other Matched Performance System TOP PERFORMANCE K&B ENGINES 16 Airplane 4 Marine K&B FUELSKAB GLOW PLUGS 7 Blends4 c5oices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER POXY RESIN K&B SUPER POXY THINNER K&B SUPER POXY PRIMERKAB SUPER POXY PAINT K&B MIXING CUPS 170 ModelAviation ML & CRAFT 16th ANNUAL APRIL 27th & 28th LONG BEACH CONVENTION CENTER 300 E OCEAN BLVD LONG BEACH GENERAL ADMISSION ADULTS $400 UNDER 12 $250 / UNDER 6 FREE HOBBY CONTESTS DEMONSTRATIONS EXHIBITIONS Contest Details Local Hobby Shop through Local Club Contact MACS CONTEST DIRECTOR P0 Box 284 Westminster CA 92684 714 891-9559 MACS IS SELLING SHOW New Model Magic Products Model Magic Epoxy Plus 2 Part 8 Mm Use anywhere two part epoxy used 25% lighter Sandable Carveable Excellent Gap Filling Non Sagging Superior Strength Sands Carves Like Basswood II 6 fI oz$895 Equal over 8 wt regular epoxys See dealer firnt Ehen wriRe cBII Model MagIc PudUCtS kc P0 Don 19784 5tu MN 55119 17151425-1397
Edition: Model Aviation - 1985/05
Page Numbers: 72, 73, 74, 75, 78, 170
Key Design Elements Larry Driskill SLOW COMBAT probably intended simple event rules call profile fuselage suction fuel system What could simple Slow Combat intended well slow enough us mortals follow action Slow Combat speeds remain slower AMA Fast Combat However often case restrictions Slow rules did result simple event has continuing trend toward complexity both airframe design engine/fuel system arrangements Fast Combat Fox MK III IV using simple pacifier pressure tank will pull almost design faster us can comfortably fly match other hand quest tightturning quick Slow Combat setup has proven difficult Build light tightturning airplane fuel-feed gremlin will climb aboard shut off power make fancy outside maneu ver Reduce venturi area gain stronger fuel draw goes top speed Successful top-of-the-line Slow designs often sophisticated require testing development comparable Fast designs Examples sophistication chicken hopper soft bladder tanks replaceable wings Phil Cartiers SC-2 tall engine venturis Fox MK IV 36 BBCL flaps Marvin Dennys Flat Iron 1983 FAI Combat Team Trials observed wings several models flex ing couple self-destructed high-G maneuvers Geophysicals distinctive feature geodesic wing structure solves problems As well being lightweight Slow Combat design Geo would make distinctive Stunt trainer sport design John Huntons part article covers construction tasking bit less specific Ill start prop work back explanation key ele ments incorporated Geo design Ill 72 Model Aviation Top Picture Geophysical R appears have just clipped about half opponents streamer Slow Combat important make small cuts rather take oppon ents entire streamer no kill scoring Left Larry Driskill Oco Note asymmetrical flying stab helps provide good line tension minimum tip weight Right Co-author/designer John Hunton uncovered Geo Wing panels tem porarily fitted fuselage Construction lightweight also very rigid strong lxi 4 Above Silhouette view wind flier R sparked idea geodesic Slow Combat design prototype Geophysical L Right full-size plans may ordered Include tem plate sheets 1/16 sheet baisa components wing templates adhered sheet balsa spray adhesive way can transferred several times panels wouldnt think model complexity could competitive CL Slow Combat model flier Larry Driskill believes several approaches get top Slow Combat pyramid design has features helped him win third 1984 National Contest addition authors note excellent sport flier U Larry Driskill John Hunton also share bit Combat philosophy Propellers Although Combat fli ers want go fast Combat purely speed event believe Combat prop should look like Stunt prop like speed prop starting point try 9 x 6 9 x 6A 9 x 7 medium-blade props Engine Geophysical designed Fox 36BBCL MK V long crankshaft allows engine mounted closer wing still complying 5-in nose rule Besides being readily available inex pensive engine has advantage tall intake stack helps ensure good fuel draw try stay away radical timing modifications reduce reli ability Suggested modifications 1 double bubble head button Virginia Craftsman 348 Argyll Circle Highland Springs VA 23075 2 Supertigre needle valve assembly 3 general cleanup ports passages have engine apart extend oil groove crankshaft journal toward front case few very shallow scratches will help prevent galling frontend wear Fuel system two popular ways go 1 soft bladder balloon tank such successfully used Jaden Wooten 1981 Nats 2 chicken hopper type metal tank such sold Triangle Hobbies 1211 Brookgreen Dr Cary NC 27511 bladder lighter may allow larger venturi opening however Ive experi enced consistent performance metal tanks Nose structure Dont eliminate Y1 sq hardwood spreader ties upper lower engine mounts together Slows long noses heavy engines often suffer vibration problems vertical maple spreader helps stiffen front end Spars carbon-fiber reinforcement highly recommended Weight gain negligible strength greatly creased Ive used both 007-in sheet ribbon type success Glue epoxy cyanoacrylate CyA Center gravity Built according plans Geo will probably come up nose-heavy 5-in-nose rule leaves us choice long tail moment tall weight Ive opted tall weight use flat sheets lead bolt 4-40 bolt nylon insert nut way can easily adjust center gravity CG until airplane trimmed suit flying style Bellcrank Use heavy-gauge alumi num bellcrank such large Fox Nylon bellcranks will work openMay1985 73 Left Wing panels can assembled quickly cyanoacrylate adhesive directly over plans Light 1/16 sheet balsa used wing construction Above completed inboard wing panel outboard panel identical except has tip weight no lead-out guides Photos article Bernie Stuecker Full-Size Plans Available. See Page 172 TRAILING EDGE-N --___ mzZILZ7 j-l/BxI/4PARTIALAS /I/4xI/4MAIN SS 27 LEADING EDGE /2 I/2~ TYPICAL GEO-WINS PANEL LINE OF LE BEFORE TRIMMING -END DF007 GRAPHITE NOTE-TRIM LE SPAR REINFORCEMENTTO 3/B RADIUS SPAR NOTCH DETAIL_ PLY V21 NOTE- DO BELLCRAN Ifj NOT USE MOUNTLITEPLY 12 REOD LINE OF PROP CUT WING OU BACKPLATE TO AS REQUIREDOUTBOARD WINPANEL BE 5 MINFOR TANKBALSAMOTION TO LE OFLE IS NONLIMIT WINGISTRUCTURAL 1/16 PLYW 0007 / I/8DIA SOLDER OUTBOARD WING ONLY 9 LEADOUT #GUIDES 4INBOARD WING ONLY 23I NOTE- PART NUMBERS ND ICATE ORDER 35 OF ASSEMBLY OF WING 36 NOTE- OUTBOARD ELEVATOR IS LON GER THAN OTHERA RUBBER TUBING RET I/B QD TUBE - 3/32PLY~ ASSEMBLY GAUGE CAN BE USED TO HOLD JOINTS TRUE FOR ASSEMBLY WITHOUT PINNING 1 ji1 AL j BAtS I - -- ---- -I~RNI Lr9ASOLDER WASHER TOP VIEWI/8DOWELGRAPHITEI TUBEFILAMENT I/2BALSASPAR REINIIOARD WINIIANEL FAIRINGFOR HOLE FOR HOLE FOR GEOPHYSICAL COMPETITION SLOW COMBAT DESIGNLARRY DRISKILL JANUARY 19B4BALLASTSTREAMER JOHN HUNTON ing fuselage may have en larged Set controls pushrod inner hole Fox bellcrank %-in offset pivot bolt helps desensitize controls airplane will stay put youre looking opponents streamer Elevator removable flying stab/ elevator allows replacement eleva tor damaged match As bonus can adjust total elevator throw moving pushrod up down control horn feature together adjustment Z-bend pushrod changing relative amount up/down movement eliminates need adjustable connectors subject failure Increased complexity can mean creased building time expense Faced similar problems fighter aircraft procurement USAF opted mix F-15 F-16 fighters Combat fliers might try same sort fix mix scratch-built wood models such Geo kit/foam models Eagle Slow Triangle Hobbies SC-2 Core House Box 300A RD #2 Palmyra PA 17078 Phantom Competition Corner 101 Forest Dr Advance NC 27006 competitive designs can built quickly Its nice have superior equipment Combat shootout However important ingredient winning Combat combination pilot better pilot 74 Model Aviation ROOT RI Left Elevator temporarily assembled fuselage Note Z-bend pushrod exits canopy easily adjusting pushrod length Above fuselage sembly ready installing wing Note rudder placement bottom fuselage pushrod exit rear canopy Holes 1/4-in carrythrough wing spars evident Fuselage sides 1/18 plywood strength rigidity 0 U 0 U2D 0 on0 U 0 0 0 0 2L WIno Z0 I- ZI L 0 Jaw BC E nIb LaIn La0 5 U ILa r La ua 0I LaIn 2I nI -z LaIDI- mm ICOAT BACK OF PAPER TEMPLATES WITH SPRAY IGEG-WI NGMARK IApHSIvE WHEN DRY PRESS TEMPLATE TO /1611 I4dB SHEET BALSA RE-USE TEMjA1CIJIOUT will win majority close matches Beyond assumptions would guess 20-25 Gb matches won getting air borne first Another 20-25% lost taking whole streamer pass Its always good plan airborne first superior equipment avoid greedy tendencies youre lined up other guys streamer Design Construction Details John Hunton Geodesic construction has appeared peripherally model aviation particular ly Free Flight light rigid construction great importance working years development wind-powered whip models using geodesics same reasons Larry Driskill saw wind model inquired would possible apply construction techniques well-developed Slow Combat designs Geophysical result Larry Driskill pilot USAF presently flying U-2s flew Cessna O-2s Nam has flying Combat years typical good flier also flies other events competition Combat however won first Fast third Slow flying Geo other models 1974 National Contest has won other meets Larry ranks fourth MACA Benefits geodesic wing Geo wing design begin excellent torsional rigidity permits lighter overall structure Geo-wing panel half span will weigh under 2 oz balsa selected properly prototype wing tested uncovered over 25 Gs presuming 24-oz model Since wing structure rigid torsion D-tube leading edge typical needed Without D-tube structural elements necessary carry through fuselage stub spars also simplifies fuselage wing panels can built separatelyconvenient construction wing panel replacement rigid wing panel permits lightweight covering materials used since covering non-structural end result lighter tighter-turning model Another unique feature Geo physical design offset horizontal stabilizer ensure proper line tension during maneuvers traditional solution has provide weight out board wing tip counteract weight control lines extend board wing span increase lift side causing slight bank toward out side circle thereby using wing lift increase line tension problem classical design solution increasing wing area lift board wing drag also increased outside causing model yaw toward circle negating some desired benefits causing model fly untrue offsetting elevator outside circle outward-rolling torque created asymmetric negative lift no negative lift drag centered elevator drag lift outside circle compared larger inboard wing reinforcing other effect using philosophy wing tip weight can reduced further Continued page 78 John Hunton launches Geophysical Tie-wraps used hold fuel tank securely fuselage providing easytank removal replacement Geo would excellent sport model Stunt trainer adding single-wheel gear much tame engine FULL LINE OF ELECTRIC SYSTEMS & Parts Avail SHIPPING & HANDLING 64 Page CATALOGUE Up $800 add $150 $200 PP/isO Class $801 $2000 add $225 copy will sent $2001 $0500 add $300 free-when requested $1501 $7000 add $350 order over $7000 add $000 HOBBY HORN CA Addressees add 6% las15173 Moran St Send MO Visa/MC6--ExpPO Boa 2212 Check allow up tO 30Westminster Ca 92685 days CK clearance 714 8030311 GOD Esact Charges Hdl Cash Only[Aft Hrs 710 89512031 lightening model Building Geo-wiag plans include templates parts build pair wing panels following materials required four sheets x 4 x 36 medium balsa two / x / x 36 hard balsa main spars two / x / x 36 hard balsa spar doublers /2 x /2 x 36 soft balsa leading edge 1/ x / x 18 hardwood carrythrough spar cyanoacrylate glue covering material choice Cut full-sized templates 4-in-wide strips Spray back templates spray adhesive let dry Press templates /16 balsa sug gest have second set balsa sheets handy As cut out parts through templates transfer templates next sheet balsa way can cut out several sheets parts set templates instructions based use cyanoacrylate CyA glue Use thin quick-curing type initial assembly finish thick CyA fill gaps Cut out parts being particularly careful cut rib slots accurate width depth Cut x hard balsa main spars same length trail ing edge parts No 11 12 Notch spars mid-depth 5 end 5-in length spar will removed later step Cut /2 x soft balsa leading edge /16 longer spars Cut four x partial spars extra long trim later Lay wing plan flat work board Cover plan waxed paper pin main spar over plan notch down toward root wing Assemble ribs No 1 2 3 4 spar rib slots up tack-glue ribs spar Add ribs No 5 6 7 8 9 assembly gluing slip rib No 10 Press other main spar place notch up toward root tack-glue place Block up trailing edge part No 11 under trailing edges wing ribs temporarily leading edge part Glue trailing edge place Install other trailing edge part No 12 glue rib intersections Install first root rib part No 13 Attach Ribs 5 10 root rib install tip rib parts 14 15 16 Attach leading edge Ribs 13 14 allow ing project beyond Rib 13 Accu rately align root rib plan attach diagonal rib leading edge wing can now removed bench final assembly Install half-ribs between spars leading edge beginning part No 17 near root continuing through part No 22 Now glue re maining diagonal ribs leading edge Install tip bow part No 23 tip trailing edge parts No 24 25 Glue part 26 spar spreader root ribcentered spar slots Enlarge spar notches ribs No 1 13 install partial spars tackgluing ribs portion main spar remain Remove 5-in portion main spars Install spar gusset parts No 27 28 sheeting parts No 29 30 root rib brace part No 31 Add root sheet parts No 32 33 trimming required Sand root rib flat block sand er except projecting leading edge glue root rib part No 34 crossed grain other root rib Add tip reinforcing parts No 35 36 Go over joints CyA glue Shape leading edge full-round %-in radius sand entire wing smooth long sanding block Trim out webs root ribs Install lead-out guides inboard wing tip weight outboard panel Cover wing Wing pairs should built opposite hand build front plans back ensure geometric symmetry Fuselage tail Basic material list % x Y8 x 9 hardwood engine bearers Y x Y x 36 medium balsa longerons Y x 2 x 9 medium balsa fuselage filler two A6 x 2 x 24 plywood fuselage sides x 2 x 12 plywood sheet bellcrank mounts fin x 2 x 12 medium balsa nose fairing 4 x OD brass tube slip-fit music wire 5 long x 6 dowel stock fuelproof finishing materials choice engine fuel tank sturdy bellcrank A-in music wire pushrod Gluing fuselage parts can accomplished economically using white glue aliphatic resin provide struc tural bond CyA through white glue speed assembly After applying thin coat white glue both sides joint apply spots CyA clamp parts together firmly joint will bond very quickly Cut % balsa fuselage filler shape longerons engine mounts Assemble engine mounts longe rons filler Check fit engine add hardwood spreader cutting accurate length Cut out % balsa tail block Pull longerons glue joints Cut % balsa longeron spreaders length Drill pushrod install Install balsa fairings ahead engine mounts Sand sides fuselage sub assembly flat Drill hole pushrod exit use heated wire have long drill Joggle belicrank end wire pushrod install fuselage Glue fuselage sides Drill engine install blind nuts fairing side mounts Cut A-in balsa fairing wing outline glue place Sand shape Continued page 170 78 Model Aviation Hoiiv Horn Old Timer _ g1t 1 II1014255 8 005 OODEL /l/1odL t7LCE ReeSRO 8EaetR 1901 BROOKLYN DODGER 56 Cabins*s*SNEWESTS Retail $52 95**INTRODUCTORY PRICE5 $3900 1938 Record Breaker 96 $6956 l939Zipper5O$5356 1930 KIsucI King 63 $0230 1901 Brigidier $6 $0076 1901 Super Guaker 78 $3276 1900 So Long 5tS3036 1936 Buccaneer 80 $5996 1938 Clipper MKI 72$0158 1937 Dallaire 108 $75 16 1935 Miss America 85 $7196 1901 Playboy Sr 80 $5116 1901 Playboy Jr 50 $31 16 1938 Powerhouse 86 $53 56 1900 Sailplane 70 $0076 1938 Trenton Terror 72 $0076 1900 Ranger 0653196 1930 Korda Wake 00 $1916 1939 Mercury 72 6 kits qualify fur SAM events FE H/C feature highest quality wacodne cut & sanded parta Superior Competition alt sheet strip wood wire 6 window material Plans orig EF models easily convertible 2ch H/C KITS Sailpianes Electric power Gas Hobby Horn SENSOAR Glider 78 Ss $1000 Midway Msdel GNOME RIG Hand Launch Glider$2000 Jolly Models FLINGER R/C HLG 58 Span $2000 Midway Model FAST EDDIE Acrobatic /05 EIec$1900 Jolly Models ELECTRICUS Electric Glider 00s$3250 Leisure PLAYBOY SR 67 Gear 05 Elect $3000 Astro ASTRO SPORT 37 Direct 05 Elect $2250 Leisure WASP 37 Direct 05 Electrics$2250 Midway ULTRA MK IV 06 Geared 00 PP $3900 Midway FLYING QUAKER 00 00055 stroke $8076 Oks/Midway DENNY JR 72 Alum Cowel$8390 55 lEli-i..y BUZZARD pn~e 1 A6 Slow Combat model has terrible engine runs youre sure isnt fuel engine suspect tank Ive got hot tip Bob Nicks Triangle Hobbies makes various size tanks becoming standard Slow Combat also sells Eagle Slow Combat foam cores plans assort ed other Combat goodies Write him 1211 Brookgreen Dr Gary NC 27511 call 919 467-6720 several other manufacturers Ill mention later columns Charlie Johnson 3716 graham St San Diego CA 92109 619 273-6530 Geophysical Driskill-Hunton Continued page 78 fuselage add fin stabilizer parts fin should mounted slot Install bellcrank mounting plates Install hardwood dowels engine mount crosspiece bellcrank mounting plate limit bellcrank travel rear wing pin Cut elevator parts shape join Sand elevator smooth airfoil shape Apply light giass cloth center section elevator CyA Install hinge tubes epoxy using filament tape reinforcing Finish fuselage elevator assem blies fuel-proof system Make effort keep nose light since tail weight will probably have added make model balance properly Install bellcrank 0021 leadouts Lead-outs can fished through wing piece wire Install elevator elevator horn Joggle rear end pushrod extra jog fine adjustment Install engine fuel system Cut hardwood stub spars length slide fuselage Pre-fit wings can get carbon-fiber material slide %-in-wide piece over stub spar extend 3 onto main wing spar Use CyA anchoring carbon-fiber wings fuselage carbonfiber material available coat joining surfaces epoxy assemble wings Balance model center gravity approximately / ahead center main spar can make controls responsive adding weight tail moving CG rear ward small increments Geophysical light responsive flying skills rusty building sport-stunt trainer begin CG well forward slower con trol response Combat trim hands experienced flier like Larry Driskill Geophysical awesome Blimp/Warner Continued page 85 course ready come down Pedalling tends tire novice easily mentioned earlier found really too crazy about heights though flying has never bothered least before case thrill never forgotten As morning progressed wide vane ty experienced novice pilots took blimp spin Gallagher Bill Charlie Brian couple other old hands certainly rig well hand could make go exactly wanted Newcomers like wife Phyllis Bills 1 2-year-old nephew George lady ran kindergarten tcok first flights mastered ship loved minute Peripatetic Raindrop name registered ultralight aircraft flying weight 1 lb probably lightest ultralights world According Brian Allen ship . ludicrously easy train someone four times strong anything else Besides says Brian other Matched Performance System TOP PERFORMANCE K&B ENGINES 16 Airplane 4 Marine K&B FUELSKAB GLOW PLUGS 7 Blends4 c5oices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER POXY RESIN K&B SUPER POXY THINNER K&B SUPER POXY PRIMERKAB SUPER POXY PAINT K&B MIXING CUPS 170 ModelAviation ML & CRAFT 16th ANNUAL APRIL 27th & 28th LONG BEACH CONVENTION CENTER 300 E OCEAN BLVD LONG BEACH GENERAL ADMISSION ADULTS $400 UNDER 12 $250 / UNDER 6 FREE HOBBY CONTESTS DEMONSTRATIONS EXHIBITIONS Contest Details Local Hobby Shop through Local Club Contact MACS CONTEST DIRECTOR P0 Box 284 Westminster CA 92684 714 891-9559 MACS IS SELLING SHOW New Model Magic Products Model Magic Epoxy Plus 2 Part 8 Mm Use anywhere two part epoxy used 25% lighter Sandable Carveable Excellent Gap Filling Non Sagging Superior Strength Sands Carves Like Basswood II 6 fI oz$895 Equal over 8 wt regular epoxys See dealer firnt Ehen wriRe cBII Model MagIc PudUCtS kc P0 Don 19784 5tu MN 55119 17151425-1397
Edition: Model Aviation - 1985/05
Page Numbers: 72, 73, 74, 75, 78, 170
Key Design Elements Larry Driskill SLOW COMBAT probably intended simple event rules call profile fuselage suction fuel system What could simple Slow Combat intended well slow enough us mortals follow action Slow Combat speeds remain slower AMA Fast Combat However often case restrictions Slow rules did result simple event has continuing trend toward complexity both airframe design engine/fuel system arrangements Fast Combat Fox MK III IV using simple pacifier pressure tank will pull almost design faster us can comfortably fly match other hand quest tightturning quick Slow Combat setup has proven difficult Build light tightturning airplane fuel-feed gremlin will climb aboard shut off power make fancy outside maneu ver Reduce venturi area gain stronger fuel draw goes top speed Successful top-of-the-line Slow designs often sophisticated require testing development comparable Fast designs Examples sophistication chicken hopper soft bladder tanks replaceable wings Phil Cartiers SC-2 tall engine venturis Fox MK IV 36 BBCL flaps Marvin Dennys Flat Iron 1983 FAI Combat Team Trials observed wings several models flex ing couple self-destructed high-G maneuvers Geophysicals distinctive feature geodesic wing structure solves problems As well being lightweight Slow Combat design Geo would make distinctive Stunt trainer sport design John Huntons part article covers construction tasking bit less specific Ill start prop work back explanation key ele ments incorporated Geo design Ill 72 Model Aviation Top Picture Geophysical R appears have just clipped about half opponents streamer Slow Combat important make small cuts rather take oppon ents entire streamer no kill scoring Left Larry Driskill Oco Note asymmetrical flying stab helps provide good line tension minimum tip weight Right Co-author/designer John Hunton uncovered Geo Wing panels tem porarily fitted fuselage Construction lightweight also very rigid strong lxi 4 Above Silhouette view wind flier R sparked idea geodesic Slow Combat design prototype Geophysical L Right full-size plans may ordered Include tem plate sheets 1/16 sheet baisa components wing templates adhered sheet balsa spray adhesive way can transferred several times panels wouldnt think model complexity could competitive CL Slow Combat model flier Larry Driskill believes several approaches get top Slow Combat pyramid design has features helped him win third 1984 National Contest addition authors note excellent sport flier U Larry Driskill John Hunton also share bit Combat philosophy Propellers Although Combat fli ers want go fast Combat purely speed event believe Combat prop should look like Stunt prop like speed prop starting point try 9 x 6 9 x 6A 9 x 7 medium-blade props Engine Geophysical designed Fox 36BBCL MK V long crankshaft allows engine mounted closer wing still complying 5-in nose rule Besides being readily available inex pensive engine has advantage tall intake stack helps ensure good fuel draw try stay away radical timing modifications reduce reli ability Suggested modifications 1 double bubble head button Virginia Craftsman 348 Argyll Circle Highland Springs VA 23075 2 Supertigre needle valve assembly 3 general cleanup ports passages have engine apart extend oil groove crankshaft journal toward front case few very shallow scratches will help prevent galling frontend wear Fuel system two popular ways go 1 soft bladder balloon tank such successfully used Jaden Wooten 1981 Nats 2 chicken hopper type metal tank such sold Triangle Hobbies 1211 Brookgreen Dr Cary NC 27511 bladder lighter may allow larger venturi opening however Ive experi enced consistent performance metal tanks Nose structure Dont eliminate Y1 sq hardwood spreader ties upper lower engine mounts together Slows long noses heavy engines often suffer vibration problems vertical maple spreader helps stiffen front end Spars carbon-fiber reinforcement highly recommended Weight gain negligible strength greatly creased Ive used both 007-in sheet ribbon type success Glue epoxy cyanoacrylate CyA Center gravity Built according plans Geo will probably come up nose-heavy 5-in-nose rule leaves us choice long tail moment tall weight Ive opted tall weight use flat sheets lead bolt 4-40 bolt nylon insert nut way can easily adjust center gravity CG until airplane trimmed suit flying style Bellcrank Use heavy-gauge alumi num bellcrank such large Fox Nylon bellcranks will work openMay1985 73 Left Wing panels can assembled quickly cyanoacrylate adhesive directly over plans Light 1/16 sheet balsa used wing construction Above completed inboard wing panel outboard panel identical except has tip weight no lead-out guides Photos article Bernie Stuecker Full-Size Plans Available. See Page 172 TRAILING EDGE-N --___ mzZILZ7 j-l/BxI/4PARTIALAS /I/4xI/4MAIN SS 27 LEADING EDGE /2 I/2~ TYPICAL GEO-WINS PANEL LINE OF LE BEFORE TRIMMING -END DF007 GRAPHITE NOTE-TRIM LE SPAR REINFORCEMENTTO 3/B RADIUS SPAR NOTCH DETAIL_ PLY V21 NOTE- DO BELLCRAN Ifj NOT USE MOUNTLITEPLY 12 REOD LINE OF PROP CUT WING OU BACKPLATE TO AS REQUIREDOUTBOARD WINPANEL BE 5 MINFOR TANKBALSAMOTION TO LE OFLE IS NONLIMIT WINGISTRUCTURAL 1/16 PLYW 0007 / I/8DIA SOLDER OUTBOARD WING ONLY 9 LEADOUT #GUIDES 4INBOARD WING ONLY 23I NOTE- PART NUMBERS ND ICATE ORDER 35 OF ASSEMBLY OF WING 36 NOTE- OUTBOARD ELEVATOR IS LON GER THAN OTHERA RUBBER TUBING RET I/B QD TUBE - 3/32PLY~ ASSEMBLY GAUGE CAN BE USED TO HOLD JOINTS TRUE FOR ASSEMBLY WITHOUT PINNING 1 ji1 AL j BAtS I - -- ---- -I~RNI Lr9ASOLDER WASHER TOP VIEWI/8DOWELGRAPHITEI TUBEFILAMENT I/2BALSASPAR REINIIOARD WINIIANEL FAIRINGFOR HOLE FOR HOLE FOR GEOPHYSICAL COMPETITION SLOW COMBAT DESIGNLARRY DRISKILL JANUARY 19B4BALLASTSTREAMER JOHN HUNTON ing fuselage may have en larged Set controls pushrod inner hole Fox bellcrank %-in offset pivot bolt helps desensitize controls airplane will stay put youre looking opponents streamer Elevator removable flying stab/ elevator allows replacement eleva tor damaged match As bonus can adjust total elevator throw moving pushrod up down control horn feature together adjustment Z-bend pushrod changing relative amount up/down movement eliminates need adjustable connectors subject failure Increased complexity can mean creased building time expense Faced similar problems fighter aircraft procurement USAF opted mix F-15 F-16 fighters Combat fliers might try same sort fix mix scratch-built wood models such Geo kit/foam models Eagle Slow Triangle Hobbies SC-2 Core House Box 300A RD #2 Palmyra PA 17078 Phantom Competition Corner 101 Forest Dr Advance NC 27006 competitive designs can built quickly Its nice have superior equipment Combat shootout However important ingredient winning Combat combination pilot better pilot 74 Model Aviation ROOT RI Left Elevator temporarily assembled fuselage Note Z-bend pushrod exits canopy easily adjusting pushrod length Above fuselage sembly ready installing wing Note rudder placement bottom fuselage pushrod exit rear canopy Holes 1/4-in carrythrough wing spars evident Fuselage sides 1/18 plywood strength rigidity 0 U 0 U2D 0 on0 U 0 0 0 0 2L WIno Z0 I- ZI L 0 Jaw BC E nIb LaIn La0 5 U ILa r La ua 0I LaIn 2I nI -z LaIDI- mm ICOAT BACK OF PAPER TEMPLATES WITH SPRAY IGEG-WI NGMARK IApHSIvE WHEN DRY PRESS TEMPLATE TO /1611 I4dB SHEET BALSA RE-USE TEMjA1CIJIOUT will win majority close matches Beyond assumptions would guess 20-25 Gb matches won getting air borne first Another 20-25% lost taking whole streamer pass Its always good plan airborne first superior equipment avoid greedy tendencies youre lined up other guys streamer Design Construction Details John Hunton Geodesic construction has appeared peripherally model aviation particular ly Free Flight light rigid construction great importance working years development wind-powered whip models using geodesics same reasons Larry Driskill saw wind model inquired would possible apply construction techniques well-developed Slow Combat designs Geophysical result Larry Driskill pilot USAF presently flying U-2s flew Cessna O-2s Nam has flying Combat years typical good flier also flies other events competition Combat however won first Fast third Slow flying Geo other models 1974 National Contest has won other meets Larry ranks fourth MACA Benefits geodesic wing Geo wing design begin excellent torsional rigidity permits lighter overall structure Geo-wing panel half span will weigh under 2 oz balsa selected properly prototype wing tested uncovered over 25 Gs presuming 24-oz model Since wing structure rigid torsion D-tube leading edge typical needed Without D-tube structural elements necessary carry through fuselage stub spars also simplifies fuselage wing panels can built separatelyconvenient construction wing panel replacement rigid wing panel permits lightweight covering materials used since covering non-structural end result lighter tighter-turning model Another unique feature Geo physical design offset horizontal stabilizer ensure proper line tension during maneuvers traditional solution has provide weight out board wing tip counteract weight control lines extend board wing span increase lift side causing slight bank toward out side circle thereby using wing lift increase line tension problem classical design solution increasing wing area lift board wing drag also increased outside causing model yaw toward circle negating some desired benefits causing model fly untrue offsetting elevator outside circle outward-rolling torque created asymmetric negative lift no negative lift drag centered elevator drag lift outside circle compared larger inboard wing reinforcing other effect using philosophy wing tip weight can reduced further Continued page 78 John Hunton launches Geophysical Tie-wraps used hold fuel tank securely fuselage providing easytank removal replacement Geo would excellent sport model Stunt trainer adding single-wheel gear much tame engine FULL LINE OF ELECTRIC SYSTEMS & Parts Avail SHIPPING & HANDLING 64 Page CATALOGUE Up $800 add $150 $200 PP/isO Class $801 $2000 add $225 copy will sent $2001 $0500 add $300 free-when requested $1501 $7000 add $350 order over $7000 add $000 HOBBY HORN CA Addressees add 6% las15173 Moran St Send MO Visa/MC6--ExpPO Boa 2212 Check allow up tO 30Westminster Ca 92685 days CK clearance 714 8030311 GOD Esact Charges Hdl Cash Only[Aft Hrs 710 89512031 lightening model Building Geo-wiag plans include templates parts build pair wing panels following materials required four sheets x 4 x 36 medium balsa two / x / x 36 hard balsa main spars two / x / x 36 hard balsa spar doublers /2 x /2 x 36 soft balsa leading edge 1/ x / x 18 hardwood carrythrough spar cyanoacrylate glue covering material choice Cut full-sized templates 4-in-wide strips Spray back templates spray adhesive let dry Press templates /16 balsa sug gest have second set balsa sheets handy As cut out parts through templates transfer templates next sheet balsa way can cut out several sheets parts set templates instructions based use cyanoacrylate CyA glue Use thin quick-curing type initial assembly finish thick CyA fill gaps Cut out parts being particularly careful cut rib slots accurate width depth Cut x hard balsa main spars same length trail ing edge parts No 11 12 Notch spars mid-depth 5 end 5-in length spar will removed later step Cut /2 x soft balsa leading edge /16 longer spars Cut four x partial spars extra long trim later Lay wing plan flat work board Cover plan waxed paper pin main spar over plan notch down toward root wing Assemble ribs No 1 2 3 4 spar rib slots up tack-glue ribs spar Add ribs No 5 6 7 8 9 assembly gluing slip rib No 10 Press other main spar place notch up toward root tack-glue place Block up trailing edge part No 11 under trailing edges wing ribs temporarily leading edge part Glue trailing edge place Install other trailing edge part No 12 glue rib intersections Install first root rib part No 13 Attach Ribs 5 10 root rib install tip rib parts 14 15 16 Attach leading edge Ribs 13 14 allow ing project beyond Rib 13 Accu rately align root rib plan attach diagonal rib leading edge wing can now removed bench final assembly Install half-ribs between spars leading edge beginning part No 17 near root continuing through part No 22 Now glue re maining diagonal ribs leading edge Install tip bow part No 23 tip trailing edge parts No 24 25 Glue part 26 spar spreader root ribcentered spar slots Enlarge spar notches ribs No 1 13 install partial spars tackgluing ribs portion main spar remain Remove 5-in portion main spars Install spar gusset parts No 27 28 sheeting parts No 29 30 root rib brace part No 31 Add root sheet parts No 32 33 trimming required Sand root rib flat block sand er except projecting leading edge glue root rib part No 34 crossed grain other root rib Add tip reinforcing parts No 35 36 Go over joints CyA glue Shape leading edge full-round %-in radius sand entire wing smooth long sanding block Trim out webs root ribs Install lead-out guides inboard wing tip weight outboard panel Cover wing Wing pairs should built opposite hand build front plans back ensure geometric symmetry Fuselage tail Basic material list % x Y8 x 9 hardwood engine bearers Y x Y x 36 medium balsa longerons Y x 2 x 9 medium balsa fuselage filler two A6 x 2 x 24 plywood fuselage sides x 2 x 12 plywood sheet bellcrank mounts fin x 2 x 12 medium balsa nose fairing 4 x OD brass tube slip-fit music wire 5 long x 6 dowel stock fuelproof finishing materials choice engine fuel tank sturdy bellcrank A-in music wire pushrod Gluing fuselage parts can accomplished economically using white glue aliphatic resin provide struc tural bond CyA through white glue speed assembly After applying thin coat white glue both sides joint apply spots CyA clamp parts together firmly joint will bond very quickly Cut % balsa fuselage filler shape longerons engine mounts Assemble engine mounts longe rons filler Check fit engine add hardwood spreader cutting accurate length Cut out % balsa tail block Pull longerons glue joints Cut % balsa longeron spreaders length Drill pushrod install Install balsa fairings ahead engine mounts Sand sides fuselage sub assembly flat Drill hole pushrod exit use heated wire have long drill Joggle belicrank end wire pushrod install fuselage Glue fuselage sides Drill engine install blind nuts fairing side mounts Cut A-in balsa fairing wing outline glue place Sand shape Continued page 170 78 Model Aviation Hoiiv Horn Old Timer _ g1t 1 II1014255 8 005 OODEL /l/1odL t7LCE ReeSRO 8EaetR 1901 BROOKLYN DODGER 56 Cabins*s*SNEWESTS Retail $52 95**INTRODUCTORY PRICE5 $3900 1938 Record Breaker 96 $6956 l939Zipper5O$5356 1930 KIsucI King 63 $0230 1901 Brigidier $6 $0076 1901 Super Guaker 78 $3276 1900 So Long 5tS3036 1936 Buccaneer 80 $5996 1938 Clipper MKI 72$0158 1937 Dallaire 108 $75 16 1935 Miss America 85 $7196 1901 Playboy Sr 80 $5116 1901 Playboy Jr 50 $31 16 1938 Powerhouse 86 $53 56 1900 Sailplane 70 $0076 1938 Trenton Terror 72 $0076 1900 Ranger 0653196 1930 Korda Wake 00 $1916 1939 Mercury 72 6 kits qualify fur SAM events FE H/C feature highest quality wacodne cut & sanded parta Superior Competition alt sheet strip wood wire 6 window material Plans orig EF models easily convertible 2ch H/C KITS Sailpianes Electric power Gas Hobby Horn SENSOAR Glider 78 Ss $1000 Midway Msdel GNOME RIG Hand Launch Glider$2000 Jolly Models FLINGER R/C HLG 58 Span $2000 Midway Model FAST EDDIE Acrobatic /05 EIec$1900 Jolly Models ELECTRICUS Electric Glider 00s$3250 Leisure PLAYBOY SR 67 Gear 05 Elect $3000 Astro ASTRO SPORT 37 Direct 05 Elect $2250 Leisure WASP 37 Direct 05 Electrics$2250 Midway ULTRA MK IV 06 Geared 00 PP $3900 Midway FLYING QUAKER 00 00055 stroke $8076 Oks/Midway DENNY JR 72 Alum Cowel$8390 55 lEli-i..y BUZZARD pn~e 1 A6 Slow Combat model has terrible engine runs youre sure isnt fuel engine suspect tank Ive got hot tip Bob Nicks Triangle Hobbies makes various size tanks becoming standard Slow Combat also sells Eagle Slow Combat foam cores plans assort ed other Combat goodies Write him 1211 Brookgreen Dr Gary NC 27511 call 919 467-6720 several other manufacturers Ill mention later columns Charlie Johnson 3716 graham St San Diego CA 92109 619 273-6530 Geophysical Driskill-Hunton Continued page 78 fuselage add fin stabilizer parts fin should mounted slot Install bellcrank mounting plates Install hardwood dowels engine mount crosspiece bellcrank mounting plate limit bellcrank travel rear wing pin Cut elevator parts shape join Sand elevator smooth airfoil shape Apply light giass cloth center section elevator CyA Install hinge tubes epoxy using filament tape reinforcing Finish fuselage elevator assem blies fuel-proof system Make effort keep nose light since tail weight will probably have added make model balance properly Install bellcrank 0021 leadouts Lead-outs can fished through wing piece wire Install elevator elevator horn Joggle rear end pushrod extra jog fine adjustment Install engine fuel system Cut hardwood stub spars length slide fuselage Pre-fit wings can get carbon-fiber material slide %-in-wide piece over stub spar extend 3 onto main wing spar Use CyA anchoring carbon-fiber wings fuselage carbonfiber material available coat joining surfaces epoxy assemble wings Balance model center gravity approximately / ahead center main spar can make controls responsive adding weight tail moving CG rear ward small increments Geophysical light responsive flying skills rusty building sport-stunt trainer begin CG well forward slower con trol response Combat trim hands experienced flier like Larry Driskill Geophysical awesome Blimp/Warner Continued page 85 course ready come down Pedalling tends tire novice easily mentioned earlier found really too crazy about heights though flying has never bothered least before case thrill never forgotten As morning progressed wide vane ty experienced novice pilots took blimp spin Gallagher Bill Charlie Brian couple other old hands certainly rig well hand could make go exactly wanted Newcomers like wife Phyllis Bills 1 2-year-old nephew George lady ran kindergarten tcok first flights mastered ship loved minute Peripatetic Raindrop name registered ultralight aircraft flying weight 1 lb probably lightest ultralights world According Brian Allen ship . ludicrously easy train someone four times strong anything else Besides says Brian other Matched Performance System TOP PERFORMANCE K&B ENGINES 16 Airplane 4 Marine K&B FUELSKAB GLOW PLUGS 7 Blends4 c5oices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER POXY RESIN K&B SUPER POXY THINNER K&B SUPER POXY PRIMERKAB SUPER POXY PAINT K&B MIXING CUPS 170 ModelAviation ML & CRAFT 16th ANNUAL APRIL 27th & 28th LONG BEACH CONVENTION CENTER 300 E OCEAN BLVD LONG BEACH GENERAL ADMISSION ADULTS $400 UNDER 12 $250 / UNDER 6 FREE HOBBY CONTESTS DEMONSTRATIONS EXHIBITIONS Contest Details Local Hobby Shop through Local Club Contact MACS CONTEST DIRECTOR P0 Box 284 Westminster CA 92684 714 891-9559 MACS IS SELLING SHOW New Model Magic Products Model Magic Epoxy Plus 2 Part 8 Mm Use anywhere two part epoxy used 25% lighter Sandable Carveable Excellent Gap Filling Non Sagging Superior Strength Sands Carves Like Basswood II 6 fI oz$895 Equal over 8 wt regular epoxys See dealer firnt Ehen wriRe cBII Model MagIc PudUCtS kc P0 Don 19784 5tu MN 55119 17151425-1397
Edition: Model Aviation - 1985/05
Page Numbers: 72, 73, 74, 75, 78, 170
Key Design Elements Larry Driskill SLOW COMBAT probably intended simple event rules call profile fuselage suction fuel system What could simple Slow Combat intended well slow enough us mortals follow action Slow Combat speeds remain slower AMA Fast Combat However often case restrictions Slow rules did result simple event has continuing trend toward complexity both airframe design engine/fuel system arrangements Fast Combat Fox MK III IV using simple pacifier pressure tank will pull almost design faster us can comfortably fly match other hand quest tightturning quick Slow Combat setup has proven difficult Build light tightturning airplane fuel-feed gremlin will climb aboard shut off power make fancy outside maneu ver Reduce venturi area gain stronger fuel draw goes top speed Successful top-of-the-line Slow designs often sophisticated require testing development comparable Fast designs Examples sophistication chicken hopper soft bladder tanks replaceable wings Phil Cartiers SC-2 tall engine venturis Fox MK IV 36 BBCL flaps Marvin Dennys Flat Iron 1983 FAI Combat Team Trials observed wings several models flex ing couple self-destructed high-G maneuvers Geophysicals distinctive feature geodesic wing structure solves problems As well being lightweight Slow Combat design Geo would make distinctive Stunt trainer sport design John Huntons part article covers construction tasking bit less specific Ill start prop work back explanation key ele ments incorporated Geo design Ill 72 Model Aviation Top Picture Geophysical R appears have just clipped about half opponents streamer Slow Combat important make small cuts rather take oppon ents entire streamer no kill scoring Left Larry Driskill Oco Note asymmetrical flying stab helps provide good line tension minimum tip weight Right Co-author/designer John Hunton uncovered Geo Wing panels tem porarily fitted fuselage Construction lightweight also very rigid strong lxi 4 Above Silhouette view wind flier R sparked idea geodesic Slow Combat design prototype Geophysical L Right full-size plans may ordered Include tem plate sheets 1/16 sheet baisa components wing templates adhered sheet balsa spray adhesive way can transferred several times panels wouldnt think model complexity could competitive CL Slow Combat model flier Larry Driskill believes several approaches get top Slow Combat pyramid design has features helped him win third 1984 National Contest addition authors note excellent sport flier U Larry Driskill John Hunton also share bit Combat philosophy Propellers Although Combat fli ers want go fast Combat purely speed event believe Combat prop should look like Stunt prop like speed prop starting point try 9 x 6 9 x 6A 9 x 7 medium-blade props Engine Geophysical designed Fox 36BBCL MK V long crankshaft allows engine mounted closer wing still complying 5-in nose rule Besides being readily available inex pensive engine has advantage tall intake stack helps ensure good fuel draw try stay away radical timing modifications reduce reli ability Suggested modifications 1 double bubble head button Virginia Craftsman 348 Argyll Circle Highland Springs VA 23075 2 Supertigre needle valve assembly 3 general cleanup ports passages have engine apart extend oil groove crankshaft journal toward front case few very shallow scratches will help prevent galling frontend wear Fuel system two popular ways go 1 soft bladder balloon tank such successfully used Jaden Wooten 1981 Nats 2 chicken hopper type metal tank such sold Triangle Hobbies 1211 Brookgreen Dr Cary NC 27511 bladder lighter may allow larger venturi opening however Ive experi enced consistent performance metal tanks Nose structure Dont eliminate Y1 sq hardwood spreader ties upper lower engine mounts together Slows long noses heavy engines often suffer vibration problems vertical maple spreader helps stiffen front end Spars carbon-fiber reinforcement highly recommended Weight gain negligible strength greatly creased Ive used both 007-in sheet ribbon type success Glue epoxy cyanoacrylate CyA Center gravity Built according plans Geo will probably come up nose-heavy 5-in-nose rule leaves us choice long tail moment tall weight Ive opted tall weight use flat sheets lead bolt 4-40 bolt nylon insert nut way can easily adjust center gravity CG until airplane trimmed suit flying style Bellcrank Use heavy-gauge alumi num bellcrank such large Fox Nylon bellcranks will work openMay1985 73 Left Wing panels can assembled quickly cyanoacrylate adhesive directly over plans Light 1/16 sheet balsa used wing construction Above completed inboard wing panel outboard panel identical except has tip weight no lead-out guides Photos article Bernie Stuecker Full-Size Plans Available. See Page 172 TRAILING EDGE-N --___ mzZILZ7 j-l/BxI/4PARTIALAS /I/4xI/4MAIN SS 27 LEADING EDGE /2 I/2~ TYPICAL GEO-WINS PANEL LINE OF LE BEFORE TRIMMING -END DF007 GRAPHITE NOTE-TRIM LE SPAR REINFORCEMENTTO 3/B RADIUS SPAR NOTCH DETAIL_ PLY V21 NOTE- DO BELLCRAN Ifj NOT USE MOUNTLITEPLY 12 REOD LINE OF PROP CUT WING OU BACKPLATE TO AS REQUIREDOUTBOARD WINPANEL BE 5 MINFOR TANKBALSAMOTION TO LE OFLE IS NONLIMIT WINGISTRUCTURAL 1/16 PLYW 0007 / I/8DIA SOLDER OUTBOARD WING ONLY 9 LEADOUT #GUIDES 4INBOARD WING ONLY 23I NOTE- PART NUMBERS ND ICATE ORDER 35 OF ASSEMBLY OF WING 36 NOTE- OUTBOARD ELEVATOR IS LON GER THAN OTHERA RUBBER TUBING RET I/B QD TUBE - 3/32PLY~ ASSEMBLY GAUGE CAN BE USED TO HOLD JOINTS TRUE FOR ASSEMBLY WITHOUT PINNING 1 ji1 AL j BAtS I - -- ---- -I~RNI Lr9ASOLDER WASHER TOP VIEWI/8DOWELGRAPHITEI TUBEFILAMENT I/2BALSASPAR REINIIOARD WINIIANEL FAIRINGFOR HOLE FOR HOLE FOR GEOPHYSICAL COMPETITION SLOW COMBAT DESIGNLARRY DRISKILL JANUARY 19B4BALLASTSTREAMER JOHN HUNTON ing fuselage may have en larged Set controls pushrod inner hole Fox bellcrank %-in offset pivot bolt helps desensitize controls airplane will stay put youre looking opponents streamer Elevator removable flying stab/ elevator allows replacement eleva tor damaged match As bonus can adjust total elevator throw moving pushrod up down control horn feature together adjustment Z-bend pushrod changing relative amount up/down movement eliminates need adjustable connectors subject failure Increased complexity can mean creased building time expense Faced similar problems fighter aircraft procurement USAF opted mix F-15 F-16 fighters Combat fliers might try same sort fix mix scratch-built wood models such Geo kit/foam models Eagle Slow Triangle Hobbies SC-2 Core House Box 300A RD #2 Palmyra PA 17078 Phantom Competition Corner 101 Forest Dr Advance NC 27006 competitive designs can built quickly Its nice have superior equipment Combat shootout However important ingredient winning Combat combination pilot better pilot 74 Model Aviation ROOT RI Left Elevator temporarily assembled fuselage Note Z-bend pushrod exits canopy easily adjusting pushrod length Above fuselage sembly ready installing wing Note rudder placement bottom fuselage pushrod exit rear canopy Holes 1/4-in carrythrough wing spars evident Fuselage sides 1/18 plywood strength rigidity 0 U 0 U2D 0 on0 U 0 0 0 0 2L WIno Z0 I- ZI L 0 Jaw BC E nIb LaIn La0 5 U ILa r La ua 0I LaIn 2I nI -z LaIDI- mm ICOAT BACK OF PAPER TEMPLATES WITH SPRAY IGEG-WI NGMARK IApHSIvE WHEN DRY PRESS TEMPLATE TO /1611 I4dB SHEET BALSA RE-USE TEMjA1CIJIOUT will win majority close matches Beyond assumptions would guess 20-25 Gb matches won getting air borne first Another 20-25% lost taking whole streamer pass Its always good plan airborne first superior equipment avoid greedy tendencies youre lined up other guys streamer Design Construction Details John Hunton Geodesic construction has appeared peripherally model aviation particular ly Free Flight light rigid construction great importance working years development wind-powered whip models using geodesics same reasons Larry Driskill saw wind model inquired would possible apply construction techniques well-developed Slow Combat designs Geophysical result Larry Driskill pilot USAF presently flying U-2s flew Cessna O-2s Nam has flying Combat years typical good flier also flies other events competition Combat however won first Fast third Slow flying Geo other models 1974 National Contest has won other meets Larry ranks fourth MACA Benefits geodesic wing Geo wing design begin excellent torsional rigidity permits lighter overall structure Geo-wing panel half span will weigh under 2 oz balsa selected properly prototype wing tested uncovered over 25 Gs presuming 24-oz model Since wing structure rigid torsion D-tube leading edge typical needed Without D-tube structural elements necessary carry through fuselage stub spars also simplifies fuselage wing panels can built separatelyconvenient construction wing panel replacement rigid wing panel permits lightweight covering materials used since covering non-structural end result lighter tighter-turning model Another unique feature Geo physical design offset horizontal stabilizer ensure proper line tension during maneuvers traditional solution has provide weight out board wing tip counteract weight control lines extend board wing span increase lift side causing slight bank toward out side circle thereby using wing lift increase line tension problem classical design solution increasing wing area lift board wing drag also increased outside causing model yaw toward circle negating some desired benefits causing model fly untrue offsetting elevator outside circle outward-rolling torque created asymmetric negative lift no negative lift drag centered elevator drag lift outside circle compared larger inboard wing reinforcing other effect using philosophy wing tip weight can reduced further Continued page 78 John Hunton launches Geophysical Tie-wraps used hold fuel tank securely fuselage providing easytank removal replacement Geo would excellent sport model Stunt trainer adding single-wheel gear much tame engine FULL LINE OF ELECTRIC SYSTEMS & Parts Avail SHIPPING & HANDLING 64 Page CATALOGUE Up $800 add $150 $200 PP/isO Class $801 $2000 add $225 copy will sent $2001 $0500 add $300 free-when requested $1501 $7000 add $350 order over $7000 add $000 HOBBY HORN CA Addressees add 6% las15173 Moran St Send MO Visa/MC6--ExpPO Boa 2212 Check allow up tO 30Westminster Ca 92685 days CK clearance 714 8030311 GOD Esact Charges Hdl Cash Only[Aft Hrs 710 89512031 lightening model Building Geo-wiag plans include templates parts build pair wing panels following materials required four sheets x 4 x 36 medium balsa two / x / x 36 hard balsa main spars two / x / x 36 hard balsa spar doublers /2 x /2 x 36 soft balsa leading edge 1/ x / x 18 hardwood carrythrough spar cyanoacrylate glue covering material choice Cut full-sized templates 4-in-wide strips Spray back templates spray adhesive let dry Press templates /16 balsa sug gest have second set balsa sheets handy As cut out parts through templates transfer templates next sheet balsa way can cut out several sheets parts set templates instructions based use cyanoacrylate CyA glue Use thin quick-curing type initial assembly finish thick CyA fill gaps Cut out parts being particularly careful cut rib slots accurate width depth Cut x hard balsa main spars same length trail ing edge parts No 11 12 Notch spars mid-depth 5 end 5-in length spar will removed later step Cut /2 x soft balsa leading edge /16 longer spars Cut four x partial spars extra long trim later Lay wing plan flat work board Cover plan waxed paper pin main spar over plan notch down toward root wing Assemble ribs No 1 2 3 4 spar rib slots up tack-glue ribs spar Add ribs No 5 6 7 8 9 assembly gluing slip rib No 10 Press other main spar place notch up toward root tack-glue place Block up trailing edge part No 11 under trailing edges wing ribs temporarily leading edge part Glue trailing edge place Install other trailing edge part No 12 glue rib intersections Install first root rib part No 13 Attach Ribs 5 10 root rib install tip rib parts 14 15 16 Attach leading edge Ribs 13 14 allow ing project beyond Rib 13 Accu rately align root rib plan attach diagonal rib leading edge wing can now removed bench final assembly Install half-ribs between spars leading edge beginning part No 17 near root continuing through part No 22 Now glue re maining diagonal ribs leading edge Install tip bow part No 23 tip trailing edge parts No 24 25 Glue part 26 spar spreader root ribcentered spar slots Enlarge spar notches ribs No 1 13 install partial spars tackgluing ribs portion main spar remain Remove 5-in portion main spars Install spar gusset parts No 27 28 sheeting parts No 29 30 root rib brace part No 31 Add root sheet parts No 32 33 trimming required Sand root rib flat block sand er except projecting leading edge glue root rib part No 34 crossed grain other root rib Add tip reinforcing parts No 35 36 Go over joints CyA glue Shape leading edge full-round %-in radius sand entire wing smooth long sanding block Trim out webs root ribs Install lead-out guides inboard wing tip weight outboard panel Cover wing Wing pairs should built opposite hand build front plans back ensure geometric symmetry Fuselage tail Basic material list % x Y8 x 9 hardwood engine bearers Y x Y x 36 medium balsa longerons Y x 2 x 9 medium balsa fuselage filler two A6 x 2 x 24 plywood fuselage sides x 2 x 12 plywood sheet bellcrank mounts fin x 2 x 12 medium balsa nose fairing 4 x OD brass tube slip-fit music wire 5 long x 6 dowel stock fuelproof finishing materials choice engine fuel tank sturdy bellcrank A-in music wire pushrod Gluing fuselage parts can accomplished economically using white glue aliphatic resin provide struc tural bond CyA through white glue speed assembly After applying thin coat white glue both sides joint apply spots CyA clamp parts together firmly joint will bond very quickly Cut % balsa fuselage filler shape longerons engine mounts Assemble engine mounts longe rons filler Check fit engine add hardwood spreader cutting accurate length Cut out % balsa tail block Pull longerons glue joints Cut % balsa longeron spreaders length Drill pushrod install Install balsa fairings ahead engine mounts Sand sides fuselage sub assembly flat Drill hole pushrod exit use heated wire have long drill Joggle belicrank end wire pushrod install fuselage Glue fuselage sides Drill engine install blind nuts fairing side mounts Cut A-in balsa fairing wing outline glue place Sand shape Continued page 170 78 Model Aviation Hoiiv Horn Old Timer _ g1t 1 II1014255 8 005 OODEL /l/1odL t7LCE ReeSRO 8EaetR 1901 BROOKLYN DODGER 56 Cabins*s*SNEWESTS Retail $52 95**INTRODUCTORY PRICE5 $3900 1938 Record Breaker 96 $6956 l939Zipper5O$5356 1930 KIsucI King 63 $0230 1901 Brigidier $6 $0076 1901 Super Guaker 78 $3276 1900 So Long 5tS3036 1936 Buccaneer 80 $5996 1938 Clipper MKI 72$0158 1937 Dallaire 108 $75 16 1935 Miss America 85 $7196 1901 Playboy Sr 80 $5116 1901 Playboy Jr 50 $31 16 1938 Powerhouse 86 $53 56 1900 Sailplane 70 $0076 1938 Trenton Terror 72 $0076 1900 Ranger 0653196 1930 Korda Wake 00 $1916 1939 Mercury 72 6 kits qualify fur SAM events FE H/C feature highest quality wacodne cut & sanded parta Superior Competition alt sheet strip wood wire 6 window material Plans orig EF models easily convertible 2ch H/C KITS Sailpianes Electric power Gas Hobby Horn SENSOAR Glider 78 Ss $1000 Midway Msdel GNOME RIG Hand Launch Glider$2000 Jolly Models FLINGER R/C HLG 58 Span $2000 Midway Model FAST EDDIE Acrobatic /05 EIec$1900 Jolly Models ELECTRICUS Electric Glider 00s$3250 Leisure PLAYBOY SR 67 Gear 05 Elect $3000 Astro ASTRO SPORT 37 Direct 05 Elect $2250 Leisure WASP 37 Direct 05 Electrics$2250 Midway ULTRA MK IV 06 Geared 00 PP $3900 Midway FLYING QUAKER 00 00055 stroke $8076 Oks/Midway DENNY JR 72 Alum Cowel$8390 55 lEli-i..y BUZZARD pn~e 1 A6 Slow Combat model has terrible engine runs youre sure isnt fuel engine suspect tank Ive got hot tip Bob Nicks Triangle Hobbies makes various size tanks becoming standard Slow Combat also sells Eagle Slow Combat foam cores plans assort ed other Combat goodies Write him 1211 Brookgreen Dr Gary NC 27511 call 919 467-6720 several other manufacturers Ill mention later columns Charlie Johnson 3716 graham St San Diego CA 92109 619 273-6530 Geophysical Driskill-Hunton Continued page 78 fuselage add fin stabilizer parts fin should mounted slot Install bellcrank mounting plates Install hardwood dowels engine mount crosspiece bellcrank mounting plate limit bellcrank travel rear wing pin Cut elevator parts shape join Sand elevator smooth airfoil shape Apply light giass cloth center section elevator CyA Install hinge tubes epoxy using filament tape reinforcing Finish fuselage elevator assem blies fuel-proof system Make effort keep nose light since tail weight will probably have added make model balance properly Install bellcrank 0021 leadouts Lead-outs can fished through wing piece wire Install elevator elevator horn Joggle rear end pushrod extra jog fine adjustment Install engine fuel system Cut hardwood stub spars length slide fuselage Pre-fit wings can get carbon-fiber material slide %-in-wide piece over stub spar extend 3 onto main wing spar Use CyA anchoring carbon-fiber wings fuselage carbonfiber material available coat joining surfaces epoxy assemble wings Balance model center gravity approximately / ahead center main spar can make controls responsive adding weight tail moving CG rear ward small increments Geophysical light responsive flying skills rusty building sport-stunt trainer begin CG well forward slower con trol response Combat trim hands experienced flier like Larry Driskill Geophysical awesome Blimp/Warner Continued page 85 course ready come down Pedalling tends tire novice easily mentioned earlier found really too crazy about heights though flying has never bothered least before case thrill never forgotten As morning progressed wide vane ty experienced novice pilots took blimp spin Gallagher Bill Charlie Brian couple other old hands certainly rig well hand could make go exactly wanted Newcomers like wife Phyllis Bills 1 2-year-old nephew George lady ran kindergarten tcok first flights mastered ship loved minute Peripatetic Raindrop name registered ultralight aircraft flying weight 1 lb probably lightest ultralights world According Brian Allen ship . ludicrously easy train someone four times strong anything else Besides says Brian other Matched Performance System TOP PERFORMANCE K&B ENGINES 16 Airplane 4 Marine K&B FUELSKAB GLOW PLUGS 7 Blends4 c5oices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER POXY RESIN K&B SUPER POXY THINNER K&B SUPER POXY PRIMERKAB SUPER POXY PAINT K&B MIXING CUPS 170 ModelAviation ML & CRAFT 16th ANNUAL APRIL 27th & 28th LONG BEACH CONVENTION CENTER 300 E OCEAN BLVD LONG BEACH GENERAL ADMISSION ADULTS $400 UNDER 12 $250 / UNDER 6 FREE HOBBY CONTESTS DEMONSTRATIONS EXHIBITIONS Contest Details Local Hobby Shop through Local Club Contact MACS CONTEST DIRECTOR P0 Box 284 Westminster CA 92684 714 891-9559 MACS IS SELLING SHOW New Model Magic Products Model Magic Epoxy Plus 2 Part 8 Mm Use anywhere two part epoxy used 25% lighter Sandable Carveable Excellent Gap Filling Non Sagging Superior Strength Sands Carves Like Basswood II 6 fI oz$895 Equal over 8 wt regular epoxys See dealer firnt Ehen wriRe cBII Model MagIc PudUCtS kc P0 Don 19784 5tu MN 55119 17151425-1397
Edition: Model Aviation - 1985/05
Page Numbers: 72, 73, 74, 75, 78, 170
Key Design Elements Larry Driskill SLOW COMBAT probably intended simple event rules call profile fuselage suction fuel system What could simple Slow Combat intended well slow enough us mortals follow action Slow Combat speeds remain slower AMA Fast Combat However often case restrictions Slow rules did result simple event has continuing trend toward complexity both airframe design engine/fuel system arrangements Fast Combat Fox MK III IV using simple pacifier pressure tank will pull almost design faster us can comfortably fly match other hand quest tightturning quick Slow Combat setup has proven difficult Build light tightturning airplane fuel-feed gremlin will climb aboard shut off power make fancy outside maneu ver Reduce venturi area gain stronger fuel draw goes top speed Successful top-of-the-line Slow designs often sophisticated require testing development comparable Fast designs Examples sophistication chicken hopper soft bladder tanks replaceable wings Phil Cartiers SC-2 tall engine venturis Fox MK IV 36 BBCL flaps Marvin Dennys Flat Iron 1983 FAI Combat Team Trials observed wings several models flex ing couple self-destructed high-G maneuvers Geophysicals distinctive feature geodesic wing structure solves problems As well being lightweight Slow Combat design Geo would make distinctive Stunt trainer sport design John Huntons part article covers construction tasking bit less specific Ill start prop work back explanation key ele ments incorporated Geo design Ill 72 Model Aviation Top Picture Geophysical R appears have just clipped about half opponents streamer Slow Combat important make small cuts rather take oppon ents entire streamer no kill scoring Left Larry Driskill Oco Note asymmetrical flying stab helps provide good line tension minimum tip weight Right Co-author/designer John Hunton uncovered Geo Wing panels tem porarily fitted fuselage Construction lightweight also very rigid strong lxi 4 Above Silhouette view wind flier R sparked idea geodesic Slow Combat design prototype Geophysical L Right full-size plans may ordered Include tem plate sheets 1/16 sheet baisa components wing templates adhered sheet balsa spray adhesive way can transferred several times panels wouldnt think model complexity could competitive CL Slow Combat model flier Larry Driskill believes several approaches get top Slow Combat pyramid design has features helped him win third 1984 National Contest addition authors note excellent sport flier U Larry Driskill John Hunton also share bit Combat philosophy Propellers Although Combat fli ers want go fast Combat purely speed event believe Combat prop should look like Stunt prop like speed prop starting point try 9 x 6 9 x 6A 9 x 7 medium-blade props Engine Geophysical designed Fox 36BBCL MK V long crankshaft allows engine mounted closer wing still complying 5-in nose rule Besides being readily available inex pensive engine has advantage tall intake stack helps ensure good fuel draw try stay away radical timing modifications reduce reli ability Suggested modifications 1 double bubble head button Virginia Craftsman 348 Argyll Circle Highland Springs VA 23075 2 Supertigre needle valve assembly 3 general cleanup ports passages have engine apart extend oil groove crankshaft journal toward front case few very shallow scratches will help prevent galling frontend wear Fuel system two popular ways go 1 soft bladder balloon tank such successfully used Jaden Wooten 1981 Nats 2 chicken hopper type metal tank such sold Triangle Hobbies 1211 Brookgreen Dr Cary NC 27511 bladder lighter may allow larger venturi opening however Ive experi enced consistent performance metal tanks Nose structure Dont eliminate Y1 sq hardwood spreader ties upper lower engine mounts together Slows long noses heavy engines often suffer vibration problems vertical maple spreader helps stiffen front end Spars carbon-fiber reinforcement highly recommended Weight gain negligible strength greatly creased Ive used both 007-in sheet ribbon type success Glue epoxy cyanoacrylate CyA Center gravity Built according plans Geo will probably come up nose-heavy 5-in-nose rule leaves us choice long tail moment tall weight Ive opted tall weight use flat sheets lead bolt 4-40 bolt nylon insert nut way can easily adjust center gravity CG until airplane trimmed suit flying style Bellcrank Use heavy-gauge alumi num bellcrank such large Fox Nylon bellcranks will work openMay1985 73 Left Wing panels can assembled quickly cyanoacrylate adhesive directly over plans Light 1/16 sheet balsa used wing construction Above completed inboard wing panel outboard panel identical except has tip weight no lead-out guides Photos article Bernie Stuecker Full-Size Plans Available. See Page 172 TRAILING EDGE-N --___ mzZILZ7 j-l/BxI/4PARTIALAS /I/4xI/4MAIN SS 27 LEADING EDGE /2 I/2~ TYPICAL GEO-WINS PANEL LINE OF LE BEFORE TRIMMING -END DF007 GRAPHITE NOTE-TRIM LE SPAR REINFORCEMENTTO 3/B RADIUS SPAR NOTCH DETAIL_ PLY V21 NOTE- DO BELLCRAN Ifj NOT USE MOUNTLITEPLY 12 REOD LINE OF PROP CUT WING OU BACKPLATE TO AS REQUIREDOUTBOARD WINPANEL BE 5 MINFOR TANKBALSAMOTION TO LE OFLE IS NONLIMIT WINGISTRUCTURAL 1/16 PLYW 0007 / I/8DIA SOLDER OUTBOARD WING ONLY 9 LEADOUT #GUIDES 4INBOARD WING ONLY 23I NOTE- PART NUMBERS ND ICATE ORDER 35 OF ASSEMBLY OF WING 36 NOTE- OUTBOARD ELEVATOR IS LON GER THAN OTHERA RUBBER TUBING RET I/B QD TUBE - 3/32PLY~ ASSEMBLY GAUGE CAN BE USED TO HOLD JOINTS TRUE FOR ASSEMBLY WITHOUT PINNING 1 ji1 AL j BAtS I - -- ---- -I~RNI Lr9ASOLDER WASHER TOP VIEWI/8DOWELGRAPHITEI TUBEFILAMENT I/2BALSASPAR REINIIOARD WINIIANEL FAIRINGFOR HOLE FOR HOLE FOR GEOPHYSICAL COMPETITION SLOW COMBAT DESIGNLARRY DRISKILL JANUARY 19B4BALLASTSTREAMER JOHN HUNTON ing fuselage may have en larged Set controls pushrod inner hole Fox bellcrank %-in offset pivot bolt helps desensitize controls airplane will stay put youre looking opponents streamer Elevator removable flying stab/ elevator allows replacement eleva tor damaged match As bonus can adjust total elevator throw moving pushrod up down control horn feature together adjustment Z-bend pushrod changing relative amount up/down movement eliminates need adjustable connectors subject failure Increased complexity can mean creased building time expense Faced similar problems fighter aircraft procurement USAF opted mix F-15 F-16 fighters Combat fliers might try same sort fix mix scratch-built wood models such Geo kit/foam models Eagle Slow Triangle Hobbies SC-2 Core House Box 300A RD #2 Palmyra PA 17078 Phantom Competition Corner 101 Forest Dr Advance NC 27006 competitive designs can built quickly Its nice have superior equipment Combat shootout However important ingredient winning Combat combination pilot better pilot 74 Model Aviation ROOT RI Left Elevator temporarily assembled fuselage Note Z-bend pushrod exits canopy easily adjusting pushrod length Above fuselage sembly ready installing wing Note rudder placement bottom fuselage pushrod exit rear canopy Holes 1/4-in carrythrough wing spars evident Fuselage sides 1/18 plywood strength rigidity 0 U 0 U2D 0 on0 U 0 0 0 0 2L WIno Z0 I- ZI L 0 Jaw BC E nIb LaIn La0 5 U ILa r La ua 0I LaIn 2I nI -z LaIDI- mm ICOAT BACK OF PAPER TEMPLATES WITH SPRAY IGEG-WI NGMARK IApHSIvE WHEN DRY PRESS TEMPLATE TO /1611 I4dB SHEET BALSA RE-USE TEMjA1CIJIOUT will win majority close matches Beyond assumptions would guess 20-25 Gb matches won getting air borne first Another 20-25% lost taking whole streamer pass Its always good plan airborne first superior equipment avoid greedy tendencies youre lined up other guys streamer Design Construction Details John Hunton Geodesic construction has appeared peripherally model aviation particular ly Free Flight light rigid construction great importance working years development wind-powered whip models using geodesics same reasons Larry Driskill saw wind model inquired would possible apply construction techniques well-developed Slow Combat designs Geophysical result Larry Driskill pilot USAF presently flying U-2s flew Cessna O-2s Nam has flying Combat years typical good flier also flies other events competition Combat however won first Fast third Slow flying Geo other models 1974 National Contest has won other meets Larry ranks fourth MACA Benefits geodesic wing Geo wing design begin excellent torsional rigidity permits lighter overall structure Geo-wing panel half span will weigh under 2 oz balsa selected properly prototype wing tested uncovered over 25 Gs presuming 24-oz model Since wing structure rigid torsion D-tube leading edge typical needed Without D-tube structural elements necessary carry through fuselage stub spars also simplifies fuselage wing panels can built separatelyconvenient construction wing panel replacement rigid wing panel permits lightweight covering materials used since covering non-structural end result lighter tighter-turning model Another unique feature Geo physical design offset horizontal stabilizer ensure proper line tension during maneuvers traditional solution has provide weight out board wing tip counteract weight control lines extend board wing span increase lift side causing slight bank toward out side circle thereby using wing lift increase line tension problem classical design solution increasing wing area lift board wing drag also increased outside causing model yaw toward circle negating some desired benefits causing model fly untrue offsetting elevator outside circle outward-rolling torque created asymmetric negative lift no negative lift drag centered elevator drag lift outside circle compared larger inboard wing reinforcing other effect using philosophy wing tip weight can reduced further Continued page 78 John Hunton launches Geophysical Tie-wraps used hold fuel tank securely fuselage providing easytank removal replacement Geo would excellent sport model Stunt trainer adding single-wheel gear much tame engine FULL LINE OF ELECTRIC SYSTEMS & Parts Avail SHIPPING & HANDLING 64 Page CATALOGUE Up $800 add $150 $200 PP/isO Class $801 $2000 add $225 copy will sent $2001 $0500 add $300 free-when requested $1501 $7000 add $350 order over $7000 add $000 HOBBY HORN CA Addressees add 6% las15173 Moran St Send MO Visa/MC6--ExpPO Boa 2212 Check allow up tO 30Westminster Ca 92685 days CK clearance 714 8030311 GOD Esact Charges Hdl Cash Only[Aft Hrs 710 89512031 lightening model Building Geo-wiag plans include templates parts build pair wing panels following materials required four sheets x 4 x 36 medium balsa two / x / x 36 hard balsa main spars two / x / x 36 hard balsa spar doublers /2 x /2 x 36 soft balsa leading edge 1/ x / x 18 hardwood carrythrough spar cyanoacrylate glue covering material choice Cut full-sized templates 4-in-wide strips Spray back templates spray adhesive let dry Press templates /16 balsa sug gest have second set balsa sheets handy As cut out parts through templates transfer templates next sheet balsa way can cut out several sheets parts set templates instructions based use cyanoacrylate CyA glue Use thin quick-curing type initial assembly finish thick CyA fill gaps Cut out parts being particularly careful cut rib slots accurate width depth Cut x hard balsa main spars same length trail ing edge parts No 11 12 Notch spars mid-depth 5 end 5-in length spar will removed later step Cut /2 x soft balsa leading edge /16 longer spars Cut four x partial spars extra long trim later Lay wing plan flat work board Cover plan waxed paper pin main spar over plan notch down toward root wing Assemble ribs No 1 2 3 4 spar rib slots up tack-glue ribs spar Add ribs No 5 6 7 8 9 assembly gluing slip rib No 10 Press other main spar place notch up toward root tack-glue place Block up trailing edge part No 11 under trailing edges wing ribs temporarily leading edge part Glue trailing edge place Install other trailing edge part No 12 glue rib intersections Install first root rib part No 13 Attach Ribs 5 10 root rib install tip rib parts 14 15 16 Attach leading edge Ribs 13 14 allow ing project beyond Rib 13 Accu rately align root rib plan attach diagonal rib leading edge wing can now removed bench final assembly Install half-ribs between spars leading edge beginning part No 17 near root continuing through part No 22 Now glue re maining diagonal ribs leading edge Install tip bow part No 23 tip trailing edge parts No 24 25 Glue part 26 spar spreader root ribcentered spar slots Enlarge spar notches ribs No 1 13 install partial spars tackgluing ribs portion main spar remain Remove 5-in portion main spars Install spar gusset parts No 27 28 sheeting parts No 29 30 root rib brace part No 31 Add root sheet parts No 32 33 trimming required Sand root rib flat block sand er except projecting leading edge glue root rib part No 34 crossed grain other root rib Add tip reinforcing parts No 35 36 Go over joints CyA glue Shape leading edge full-round %-in radius sand entire wing smooth long sanding block Trim out webs root ribs Install lead-out guides inboard wing tip weight outboard panel Cover wing Wing pairs should built opposite hand build front plans back ensure geometric symmetry Fuselage tail Basic material list % x Y8 x 9 hardwood engine bearers Y x Y x 36 medium balsa longerons Y x 2 x 9 medium balsa fuselage filler two A6 x 2 x 24 plywood fuselage sides x 2 x 12 plywood sheet bellcrank mounts fin x 2 x 12 medium balsa nose fairing 4 x OD brass tube slip-fit music wire 5 long x 6 dowel stock fuelproof finishing materials choice engine fuel tank sturdy bellcrank A-in music wire pushrod Gluing fuselage parts can accomplished economically using white glue aliphatic resin provide struc tural bond CyA through white glue speed assembly After applying thin coat white glue both sides joint apply spots CyA clamp parts together firmly joint will bond very quickly Cut % balsa fuselage filler shape longerons engine mounts Assemble engine mounts longe rons filler Check fit engine add hardwood spreader cutting accurate length Cut out % balsa tail block Pull longerons glue joints Cut % balsa longeron spreaders length Drill pushrod install Install balsa fairings ahead engine mounts Sand sides fuselage sub assembly flat Drill hole pushrod exit use heated wire have long drill Joggle belicrank end wire pushrod install fuselage Glue fuselage sides Drill engine install blind nuts fairing side mounts Cut A-in balsa fairing wing outline glue place Sand shape Continued page 170 78 Model Aviation Hoiiv Horn Old Timer _ g1t 1 II1014255 8 005 OODEL /l/1odL t7LCE ReeSRO 8EaetR 1901 BROOKLYN DODGER 56 Cabins*s*SNEWESTS Retail $52 95**INTRODUCTORY PRICE5 $3900 1938 Record Breaker 96 $6956 l939Zipper5O$5356 1930 KIsucI King 63 $0230 1901 Brigidier $6 $0076 1901 Super Guaker 78 $3276 1900 So Long 5tS3036 1936 Buccaneer 80 $5996 1938 Clipper MKI 72$0158 1937 Dallaire 108 $75 16 1935 Miss America 85 $7196 1901 Playboy Sr 80 $5116 1901 Playboy Jr 50 $31 16 1938 Powerhouse 86 $53 56 1900 Sailplane 70 $0076 1938 Trenton Terror 72 $0076 1900 Ranger 0653196 1930 Korda Wake 00 $1916 1939 Mercury 72 6 kits qualify fur SAM events FE H/C feature highest quality wacodne cut & sanded parta Superior Competition alt sheet strip wood wire 6 window material Plans orig EF models easily convertible 2ch H/C KITS Sailpianes Electric power Gas Hobby Horn SENSOAR Glider 78 Ss $1000 Midway Msdel GNOME RIG Hand Launch Glider$2000 Jolly Models FLINGER R/C HLG 58 Span $2000 Midway Model FAST EDDIE Acrobatic /05 EIec$1900 Jolly Models ELECTRICUS Electric Glider 00s$3250 Leisure PLAYBOY SR 67 Gear 05 Elect $3000 Astro ASTRO SPORT 37 Direct 05 Elect $2250 Leisure WASP 37 Direct 05 Electrics$2250 Midway ULTRA MK IV 06 Geared 00 PP $3900 Midway FLYING QUAKER 00 00055 stroke $8076 Oks/Midway DENNY JR 72 Alum Cowel$8390 55 lEli-i..y BUZZARD pn~e 1 A6 Slow Combat model has terrible engine runs youre sure isnt fuel engine suspect tank Ive got hot tip Bob Nicks Triangle Hobbies makes various size tanks becoming standard Slow Combat also sells Eagle Slow Combat foam cores plans assort ed other Combat goodies Write him 1211 Brookgreen Dr Gary NC 27511 call 919 467-6720 several other manufacturers Ill mention later columns Charlie Johnson 3716 graham St San Diego CA 92109 619 273-6530 Geophysical Driskill-Hunton Continued page 78 fuselage add fin stabilizer parts fin should mounted slot Install bellcrank mounting plates Install hardwood dowels engine mount crosspiece bellcrank mounting plate limit bellcrank travel rear wing pin Cut elevator parts shape join Sand elevator smooth airfoil shape Apply light giass cloth center section elevator CyA Install hinge tubes epoxy using filament tape reinforcing Finish fuselage elevator assem blies fuel-proof system Make effort keep nose light since tail weight will probably have added make model balance properly Install bellcrank 0021 leadouts Lead-outs can fished through wing piece wire Install elevator elevator horn Joggle rear end pushrod extra jog fine adjustment Install engine fuel system Cut hardwood stub spars length slide fuselage Pre-fit wings can get carbon-fiber material slide %-in-wide piece over stub spar extend 3 onto main wing spar Use CyA anchoring carbon-fiber wings fuselage carbonfiber material available coat joining surfaces epoxy assemble wings Balance model center gravity approximately / ahead center main spar can make controls responsive adding weight tail moving CG rear ward small increments Geophysical light responsive flying skills rusty building sport-stunt trainer begin CG well forward slower con trol response Combat trim hands experienced flier like Larry Driskill Geophysical awesome Blimp/Warner Continued page 85 course ready come down Pedalling tends tire novice easily mentioned earlier found really too crazy about heights though flying has never bothered least before case thrill never forgotten As morning progressed wide vane ty experienced novice pilots took blimp spin Gallagher Bill Charlie Brian couple other old hands certainly rig well hand could make go exactly wanted Newcomers like wife Phyllis Bills 1 2-year-old nephew George lady ran kindergarten tcok first flights mastered ship loved minute Peripatetic Raindrop name registered ultralight aircraft flying weight 1 lb probably lightest ultralights world According Brian Allen ship . ludicrously easy train someone four times strong anything else Besides says Brian other Matched Performance System TOP PERFORMANCE K&B ENGINES 16 Airplane 4 Marine K&B FUELSKAB GLOW PLUGS 7 Blends4 c5oices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER POXY RESIN K&B SUPER POXY THINNER K&B SUPER POXY PRIMERKAB SUPER POXY PAINT K&B MIXING CUPS 170 ModelAviation ML & CRAFT 16th ANNUAL APRIL 27th & 28th LONG BEACH CONVENTION CENTER 300 E OCEAN BLVD LONG BEACH GENERAL ADMISSION ADULTS $400 UNDER 12 $250 / UNDER 6 FREE HOBBY CONTESTS DEMONSTRATIONS EXHIBITIONS Contest Details Local Hobby Shop through Local Club Contact MACS CONTEST DIRECTOR P0 Box 284 Westminster CA 92684 714 891-9559 MACS IS SELLING SHOW New Model Magic Products Model Magic Epoxy Plus 2 Part 8 Mm Use anywhere two part epoxy used 25% lighter Sandable Carveable Excellent Gap Filling Non Sagging Superior Strength Sands Carves Like Basswood II 6 fI oz$895 Equal over 8 wt regular epoxys See dealer firnt Ehen wriRe cBII Model MagIc PudUCtS kc P0 Don 19784 5tu MN 55119 17151425-1397
Edition: Model Aviation - 1985/05
Page Numbers: 72, 73, 74, 75, 78, 170
Key Design Elements Larry Driskill SLOW COMBAT probably intended simple event rules call profile fuselage suction fuel system What could simple Slow Combat intended well slow enough us mortals follow action Slow Combat speeds remain slower AMA Fast Combat However often case restrictions Slow rules did result simple event has continuing trend toward complexity both airframe design engine/fuel system arrangements Fast Combat Fox MK III IV using simple pacifier pressure tank will pull almost design faster us can comfortably fly match other hand quest tightturning quick Slow Combat setup has proven difficult Build light tightturning airplane fuel-feed gremlin will climb aboard shut off power make fancy outside maneu ver Reduce venturi area gain stronger fuel draw goes top speed Successful top-of-the-line Slow designs often sophisticated require testing development comparable Fast designs Examples sophistication chicken hopper soft bladder tanks replaceable wings Phil Cartiers SC-2 tall engine venturis Fox MK IV 36 BBCL flaps Marvin Dennys Flat Iron 1983 FAI Combat Team Trials observed wings several models flex ing couple self-destructed high-G maneuvers Geophysicals distinctive feature geodesic wing structure solves problems As well being lightweight Slow Combat design Geo would make distinctive Stunt trainer sport design John Huntons part article covers construction tasking bit less specific Ill start prop work back explanation key ele ments incorporated Geo design Ill 72 Model Aviation Top Picture Geophysical R appears have just clipped about half opponents streamer Slow Combat important make small cuts rather take oppon ents entire streamer no kill scoring Left Larry Driskill Oco Note asymmetrical flying stab helps provide good line tension minimum tip weight Right Co-author/designer John Hunton uncovered Geo Wing panels tem porarily fitted fuselage Construction lightweight also very rigid strong lxi 4 Above Silhouette view wind flier R sparked idea geodesic Slow Combat design prototype Geophysical L Right full-size plans may ordered Include tem plate sheets 1/16 sheet baisa components wing templates adhered sheet balsa spray adhesive way can transferred several times panels wouldnt think model complexity could competitive CL Slow Combat model flier Larry Driskill believes several approaches get top Slow Combat pyramid design has features helped him win third 1984 National Contest addition authors note excellent sport flier U Larry Driskill John Hunton also share bit Combat philosophy Propellers Although Combat fli ers want go fast Combat purely speed event believe Combat prop should look like Stunt prop like speed prop starting point try 9 x 6 9 x 6A 9 x 7 medium-blade props Engine Geophysical designed Fox 36BBCL MK V long crankshaft allows engine mounted closer wing still complying 5-in nose rule Besides being readily available inex pensive engine has advantage tall intake stack helps ensure good fuel draw try stay away radical timing modifications reduce reli ability Suggested modifications 1 double bubble head button Virginia Craftsman 348 Argyll Circle Highland Springs VA 23075 2 Supertigre needle valve assembly 3 general cleanup ports passages have engine apart extend oil groove crankshaft journal toward front case few very shallow scratches will help prevent galling frontend wear Fuel system two popular ways go 1 soft bladder balloon tank such successfully used Jaden Wooten 1981 Nats 2 chicken hopper type metal tank such sold Triangle Hobbies 1211 Brookgreen Dr Cary NC 27511 bladder lighter may allow larger venturi opening however Ive experi enced consistent performance metal tanks Nose structure Dont eliminate Y1 sq hardwood spreader ties upper lower engine mounts together Slows long noses heavy engines often suffer vibration problems vertical maple spreader helps stiffen front end Spars carbon-fiber reinforcement highly recommended Weight gain negligible strength greatly creased Ive used both 007-in sheet ribbon type success Glue epoxy cyanoacrylate CyA Center gravity Built according plans Geo will probably come up nose-heavy 5-in-nose rule leaves us choice long tail moment tall weight Ive opted tall weight use flat sheets lead bolt 4-40 bolt nylon insert nut way can easily adjust center gravity CG until airplane trimmed suit flying style Bellcrank Use heavy-gauge alumi num bellcrank such large Fox Nylon bellcranks will work openMay1985 73 Left Wing panels can assembled quickly cyanoacrylate adhesive directly over plans Light 1/16 sheet balsa used wing construction Above completed inboard wing panel outboard panel identical except has tip weight no lead-out guides Photos article Bernie Stuecker Full-Size Plans Available. See Page 172 TRAILING EDGE-N --___ mzZILZ7 j-l/BxI/4PARTIALAS /I/4xI/4MAIN SS 27 LEADING EDGE /2 I/2~ TYPICAL GEO-WINS PANEL LINE OF LE BEFORE TRIMMING -END DF007 GRAPHITE NOTE-TRIM LE SPAR REINFORCEMENTTO 3/B RADIUS SPAR NOTCH DETAIL_ PLY V21 NOTE- DO BELLCRAN Ifj NOT USE MOUNTLITEPLY 12 REOD LINE OF PROP CUT WING OU BACKPLATE TO AS REQUIREDOUTBOARD WINPANEL BE 5 MINFOR TANKBALSAMOTION TO LE OFLE IS NONLIMIT WINGISTRUCTURAL 1/16 PLYW 0007 / I/8DIA SOLDER OUTBOARD WING ONLY 9 LEADOUT #GUIDES 4INBOARD WING ONLY 23I NOTE- PART NUMBERS ND ICATE ORDER 35 OF ASSEMBLY OF WING 36 NOTE- OUTBOARD ELEVATOR IS LON GER THAN OTHERA RUBBER TUBING RET I/B QD TUBE - 3/32PLY~ ASSEMBLY GAUGE CAN BE USED TO HOLD JOINTS TRUE FOR ASSEMBLY WITHOUT PINNING 1 ji1 AL j BAtS I - -- ---- -I~RNI Lr9ASOLDER WASHER TOP VIEWI/8DOWELGRAPHITEI TUBEFILAMENT I/2BALSASPAR REINIIOARD WINIIANEL FAIRINGFOR HOLE FOR HOLE FOR GEOPHYSICAL COMPETITION SLOW COMBAT DESIGNLARRY DRISKILL JANUARY 19B4BALLASTSTREAMER JOHN HUNTON ing fuselage may have en larged Set controls pushrod inner hole Fox bellcrank %-in offset pivot bolt helps desensitize controls airplane will stay put youre looking opponents streamer Elevator removable flying stab/ elevator allows replacement eleva tor damaged match As bonus can adjust total elevator throw moving pushrod up down control horn feature together adjustment Z-bend pushrod changing relative amount up/down movement eliminates need adjustable connectors subject failure Increased complexity can mean creased building time expense Faced similar problems fighter aircraft procurement USAF opted mix F-15 F-16 fighters Combat fliers might try same sort fix mix scratch-built wood models such Geo kit/foam models Eagle Slow Triangle Hobbies SC-2 Core House Box 300A RD #2 Palmyra PA 17078 Phantom Competition Corner 101 Forest Dr Advance NC 27006 competitive designs can built quickly Its nice have superior equipment Combat shootout However important ingredient winning Combat combination pilot better pilot 74 Model Aviation ROOT RI Left Elevator temporarily assembled fuselage Note Z-bend pushrod exits canopy easily adjusting pushrod length Above fuselage sembly ready installing wing Note rudder placement bottom fuselage pushrod exit rear canopy Holes 1/4-in carrythrough wing spars evident Fuselage sides 1/18 plywood strength rigidity 0 U 0 U2D 0 on0 U 0 0 0 0 2L WIno Z0 I- ZI L 0 Jaw BC E nIb LaIn La0 5 U ILa r La ua 0I LaIn 2I nI -z LaIDI- mm ICOAT BACK OF PAPER TEMPLATES WITH SPRAY IGEG-WI NGMARK IApHSIvE WHEN DRY PRESS TEMPLATE TO /1611 I4dB SHEET BALSA RE-USE TEMjA1CIJIOUT will win majority close matches Beyond assumptions would guess 20-25 Gb matches won getting air borne first Another 20-25% lost taking whole streamer pass Its always good plan airborne first superior equipment avoid greedy tendencies youre lined up other guys streamer Design Construction Details John Hunton Geodesic construction has appeared peripherally model aviation particular ly Free Flight light rigid construction great importance working years development wind-powered whip models using geodesics same reasons Larry Driskill saw wind model inquired would possible apply construction techniques well-developed Slow Combat designs Geophysical result Larry Driskill pilot USAF presently flying U-2s flew Cessna O-2s Nam has flying Combat years typical good flier also flies other events competition Combat however won first Fast third Slow flying Geo other models 1974 National Contest has won other meets Larry ranks fourth MACA Benefits geodesic wing Geo wing design begin excellent torsional rigidity permits lighter overall structure Geo-wing panel half span will weigh under 2 oz balsa selected properly prototype wing tested uncovered over 25 Gs presuming 24-oz model Since wing structure rigid torsion D-tube leading edge typical needed Without D-tube structural elements necessary carry through fuselage stub spars also simplifies fuselage wing panels can built separatelyconvenient construction wing panel replacement rigid wing panel permits lightweight covering materials used since covering non-structural end result lighter tighter-turning model Another unique feature Geo physical design offset horizontal stabilizer ensure proper line tension during maneuvers traditional solution has provide weight out board wing tip counteract weight control lines extend board wing span increase lift side causing slight bank toward out side circle thereby using wing lift increase line tension problem classical design solution increasing wing area lift board wing drag also increased outside causing model yaw toward circle negating some desired benefits causing model fly untrue offsetting elevator outside circle outward-rolling torque created asymmetric negative lift no negative lift drag centered elevator drag lift outside circle compared larger inboard wing reinforcing other effect using philosophy wing tip weight can reduced further Continued page 78 John Hunton launches Geophysical Tie-wraps used hold fuel tank securely fuselage providing easytank removal replacement Geo would excellent sport model Stunt trainer adding single-wheel gear much tame engine FULL LINE OF ELECTRIC SYSTEMS & Parts Avail SHIPPING & HANDLING 64 Page CATALOGUE Up $800 add $150 $200 PP/isO Class $801 $2000 add $225 copy will sent $2001 $0500 add $300 free-when requested $1501 $7000 add $350 order over $7000 add $000 HOBBY HORN CA Addressees add 6% las15173 Moran St Send MO Visa/MC6--ExpPO Boa 2212 Check allow up tO 30Westminster Ca 92685 days CK clearance 714 8030311 GOD Esact Charges Hdl Cash Only[Aft Hrs 710 89512031 lightening model Building Geo-wiag plans include templates parts build pair wing panels following materials required four sheets x 4 x 36 medium balsa two / x / x 36 hard balsa main spars two / x / x 36 hard balsa spar doublers /2 x /2 x 36 soft balsa leading edge 1/ x / x 18 hardwood carrythrough spar cyanoacrylate glue covering material choice Cut full-sized templates 4-in-wide strips Spray back templates spray adhesive let dry Press templates /16 balsa sug gest have second set balsa sheets handy As cut out parts through templates transfer templates next sheet balsa way can cut out several sheets parts set templates instructions based use cyanoacrylate CyA glue Use thin quick-curing type initial assembly finish thick CyA fill gaps Cut out parts being particularly careful cut rib slots accurate width depth Cut x hard balsa main spars same length trail ing edge parts No 11 12 Notch spars mid-depth 5 end 5-in length spar will removed later step Cut /2 x soft balsa leading edge /16 longer spars Cut four x partial spars extra long trim later Lay wing plan flat work board Cover plan waxed paper pin main spar over plan notch down toward root wing Assemble ribs No 1 2 3 4 spar rib slots up tack-glue ribs spar Add ribs No 5 6 7 8 9 assembly gluing slip rib No 10 Press other main spar place notch up toward root tack-glue place Block up trailing edge part No 11 under trailing edges wing ribs temporarily leading edge part Glue trailing edge place Install other trailing edge part No 12 glue rib intersections Install first root rib part No 13 Attach Ribs 5 10 root rib install tip rib parts 14 15 16 Attach leading edge Ribs 13 14 allow ing project beyond Rib 13 Accu rately align root rib plan attach diagonal rib leading edge wing can now removed bench final assembly Install half-ribs between spars leading edge beginning part No 17 near root continuing through part No 22 Now glue re maining diagonal ribs leading edge Install tip bow part No 23 tip trailing edge parts No 24 25 Glue part 26 spar spreader root ribcentered spar slots Enlarge spar notches ribs No 1 13 install partial spars tackgluing ribs portion main spar remain Remove 5-in portion main spars Install spar gusset parts No 27 28 sheeting parts No 29 30 root rib brace part No 31 Add root sheet parts No 32 33 trimming required Sand root rib flat block sand er except projecting leading edge glue root rib part No 34 crossed grain other root rib Add tip reinforcing parts No 35 36 Go over joints CyA glue Shape leading edge full-round %-in radius sand entire wing smooth long sanding block Trim out webs root ribs Install lead-out guides inboard wing tip weight outboard panel Cover wing Wing pairs should built opposite hand build front plans back ensure geometric symmetry Fuselage tail Basic material list % x Y8 x 9 hardwood engine bearers Y x Y x 36 medium balsa longerons Y x 2 x 9 medium balsa fuselage filler two A6 x 2 x 24 plywood fuselage sides x 2 x 12 plywood sheet bellcrank mounts fin x 2 x 12 medium balsa nose fairing 4 x OD brass tube slip-fit music wire 5 long x 6 dowel stock fuelproof finishing materials choice engine fuel tank sturdy bellcrank A-in music wire pushrod Gluing fuselage parts can accomplished economically using white glue aliphatic resin provide struc tural bond CyA through white glue speed assembly After applying thin coat white glue both sides joint apply spots CyA clamp parts together firmly joint will bond very quickly Cut % balsa fuselage filler shape longerons engine mounts Assemble engine mounts longe rons filler Check fit engine add hardwood spreader cutting accurate length Cut out % balsa tail block Pull longerons glue joints Cut % balsa longeron spreaders length Drill pushrod install Install balsa fairings ahead engine mounts Sand sides fuselage sub assembly flat Drill hole pushrod exit use heated wire have long drill Joggle belicrank end wire pushrod install fuselage Glue fuselage sides Drill engine install blind nuts fairing side mounts Cut A-in balsa fairing wing outline glue place Sand shape Continued page 170 78 Model Aviation Hoiiv Horn Old Timer _ g1t 1 II1014255 8 005 OODEL /l/1odL t7LCE ReeSRO 8EaetR 1901 BROOKLYN DODGER 56 Cabins*s*SNEWESTS Retail $52 95**INTRODUCTORY PRICE5 $3900 1938 Record Breaker 96 $6956 l939Zipper5O$5356 1930 KIsucI King 63 $0230 1901 Brigidier $6 $0076 1901 Super Guaker 78 $3276 1900 So Long 5tS3036 1936 Buccaneer 80 $5996 1938 Clipper MKI 72$0158 1937 Dallaire 108 $75 16 1935 Miss America 85 $7196 1901 Playboy Sr 80 $5116 1901 Playboy Jr 50 $31 16 1938 Powerhouse 86 $53 56 1900 Sailplane 70 $0076 1938 Trenton Terror 72 $0076 1900 Ranger 0653196 1930 Korda Wake 00 $1916 1939 Mercury 72 6 kits qualify fur SAM events FE H/C feature highest quality wacodne cut & sanded parta Superior Competition alt sheet strip wood wire 6 window material Plans orig EF models easily convertible 2ch H/C KITS Sailpianes Electric power Gas Hobby Horn SENSOAR Glider 78 Ss $1000 Midway Msdel GNOME RIG Hand Launch Glider$2000 Jolly Models FLINGER R/C HLG 58 Span $2000 Midway Model FAST EDDIE Acrobatic /05 EIec$1900 Jolly Models ELECTRICUS Electric Glider 00s$3250 Leisure PLAYBOY SR 67 Gear 05 Elect $3000 Astro ASTRO SPORT 37 Direct 05 Elect $2250 Leisure WASP 37 Direct 05 Electrics$2250 Midway ULTRA MK IV 06 Geared 00 PP $3900 Midway FLYING QUAKER 00 00055 stroke $8076 Oks/Midway DENNY JR 72 Alum Cowel$8390 55 lEli-i..y BUZZARD pn~e 1 A6 Slow Combat model has terrible engine runs youre sure isnt fuel engine suspect tank Ive got hot tip Bob Nicks Triangle Hobbies makes various size tanks becoming standard Slow Combat also sells Eagle Slow Combat foam cores plans assort ed other Combat goodies Write him 1211 Brookgreen Dr Gary NC 27511 call 919 467-6720 several other manufacturers Ill mention later columns Charlie Johnson 3716 graham St San Diego CA 92109 619 273-6530 Geophysical Driskill-Hunton Continued page 78 fuselage add fin stabilizer parts fin should mounted slot Install bellcrank mounting plates Install hardwood dowels engine mount crosspiece bellcrank mounting plate limit bellcrank travel rear wing pin Cut elevator parts shape join Sand elevator smooth airfoil shape Apply light giass cloth center section elevator CyA Install hinge tubes epoxy using filament tape reinforcing Finish fuselage elevator assem blies fuel-proof system Make effort keep nose light since tail weight will probably have added make model balance properly Install bellcrank 0021 leadouts Lead-outs can fished through wing piece wire Install elevator elevator horn Joggle rear end pushrod extra jog fine adjustment Install engine fuel system Cut hardwood stub spars length slide fuselage Pre-fit wings can get carbon-fiber material slide %-in-wide piece over stub spar extend 3 onto main wing spar Use CyA anchoring carbon-fiber wings fuselage carbonfiber material available coat joining surfaces epoxy assemble wings Balance model center gravity approximately / ahead center main spar can make controls responsive adding weight tail moving CG rear ward small increments Geophysical light responsive flying skills rusty building sport-stunt trainer begin CG well forward slower con trol response Combat trim hands experienced flier like Larry Driskill Geophysical awesome Blimp/Warner Continued page 85 course ready come down Pedalling tends tire novice easily mentioned earlier found really too crazy about heights though flying has never bothered least before case thrill never forgotten As morning progressed wide vane ty experienced novice pilots took blimp spin Gallagher Bill Charlie Brian couple other old hands certainly rig well hand could make go exactly wanted Newcomers like wife Phyllis Bills 1 2-year-old nephew George lady ran kindergarten tcok first flights mastered ship loved minute Peripatetic Raindrop name registered ultralight aircraft flying weight 1 lb probably lightest ultralights world According Brian Allen ship . ludicrously easy train someone four times strong anything else Besides says Brian other Matched Performance System TOP PERFORMANCE K&B ENGINES 16 Airplane 4 Marine K&B FUELSKAB GLOW PLUGS 7 Blends4 c5oices Matched Finish System BEST APPEARANCE K&B FIBERGLASS CLOTH K&B Micro-Balloons FILLER K&B SUPER POXY RESIN K&B SUPER POXY THINNER K&B SUPER POXY PRIMERKAB SUPER POXY PAINT K&B MIXING CUPS 170 ModelAviation ML & CRAFT 16th ANNUAL APRIL 27th & 28th LONG BEACH CONVENTION CENTER 300 E OCEAN BLVD LONG BEACH GENERAL ADMISSION ADULTS $400 UNDER 12 $250 / UNDER 6 FREE HOBBY CONTESTS DEMONSTRATIONS EXHIBITIONS Contest Details Local Hobby Shop through Local Club Contact MACS CONTEST DIRECTOR P0 Box 284 Westminster CA 92684 714 891-9559 MACS IS SELLING SHOW New Model Magic Products Model Magic Epoxy Plus 2 Part 8 Mm Use anywhere two part epoxy used 25% lighter Sandable Carveable Excellent Gap Filling Non Sagging Superior Strength Sands Carves Like Basswood II 6 fI oz$895 Equal over 8 wt regular epoxys See dealer firnt Ehen wriRe cBII Model MagIc PudUCtS kc P0 Don 19784 5tu MN 55119 17151425-1397