BEEPER BELIEVER feeling familiar anyone has ever flown Free Flighta mix ture joy panic realize model has just maxed Out big thermaland its coming down Thats what feeling got fence about mile downwind annual Pensacola contest last June About time started over fence Jim Bradley pedaled up all-terrain bicycle Jim hopped off bike lifted over fence climbed over pedaled off after Nordic same thermal Wakefield Through small radio receiver Jims hand putting out its static-clouded squawk climbed back truck looped out main gate went driving after Jim Another mile downwind spotted Jims bicycle saw Jim off pasture Neither model sight Jims beeper picking up signal some woods farther downwind headed Brer Rabbit would have felt right home briar patch woods mixed pines hardwoods dense undergrowth bram bles blackberries quite ripe small scanner Jim carrying short whip tenna Jim used body direction finder would hold scanner agalnst chest slowly turn body signal dropped off would about-face head off direction spread out helped him search half hour headed back fly next round Jim stayed search Less hour later Jim pedaled back flight line model Despite several hours searching later afternoon next morning Wake beeper stays bur ied woods Believe next models will have some sort beeper board several com mercial units around Jim Bradley sells individ ual beeper well thats part elec tronic Nordic timer Jim Walston has developed sophisticatedand very lightweighttransmitter receiver directional antenna Gil Morris sells inexpensive transmitter kit Its teresting note folks east Mississippi addresses youd like information Bradley Model Products 1337 Pine Sap Ct Orlando FL 32825 Jim Walston Retrieval Systems 725 Cooper Lake Rd SE Smyrna GA 30080 Gil Morris 2810 Brackicy Rd Columbus OH 43220 Wakefield front ends unit photo graph slick-looking front end Poland Adam Tracy brought back Junior World Championships last sutmner work manship unbelievable looks like piece jewelry model part alumi num parts highly polished look chrome plated balsa nose block spinner finished deep red high-gloss lacquer Besides finish front end incorporates several unusual features bobbin bayonets 70 Model Aviation Free Flight Duration Louis Joyner 3657 Bmokwood Rd Blnnlngham AL 35223 Adam Tracy obtained fabulous Wakefield front end Poland 88 FF Jr World Champs appears production item Maybe some US entrepreneur will import Hooks prop hub rubberbands aid folding blades Info column Also Poland way Arizona aluminum engine mount/front fuselage Randy Archers FiC model Russian-style mechanical timer uses notched disc actuate autosurface functiona stacked-disc scroll dethermalizer actuation Doug Joyces custom fleid box provides preflight nest canard PlC plane Aluminum-skinned wing pops up DT onto rear shaft theres no chance off-center motor causing bobbin wobble hit inside motor tube Instead usual Montreal-style drop pin front end uses pivoting arm thats spring loaded Motor torque holds arm out torque drops off spring swings arm catches notch rim nose block Evidenfly front ends commercially made Lets hope somebody will begin importing drawings limited-production de layed prop release DPR front end Yugoslav ian Wake flier engineer Marjan Klenovsek making Like Russian DPR front end used Andrukov 1981 World Champs units holds propeller blades Out feathered launch After hard vertical launch clock work timer releases line wire arm blades go preset pitch setting begin turn everything works gain height something around 30 ft Note nor variable-pitch VP front end Marjan says tests have shown VP wasnt beneficial DPR DPR front end sells $145 plus postage Marjan also makes light simple reverse-Montreal front end thats $44 plus $4 postage Send payment dol lars check international department local bank sure include both side outside diameters motor tube Marjan can custom-fit front end address Marian Klenovsek Milcinskega 8 63000 Celje Yugoslavia Bending booms Its Catch-22s Free Flight make tail boom light enough wont strong enough After years trying build lightbut stifftail booms Wakefields decided step back take look real problem First question does boom bend Surely aerody namic loads 20% stab What about auto surface DT lines running through boom Thats like Typically control lines enter tail boom top just behind rear motor peg Any tension line will tend bend boom Continued page 173 May 1989 71 Back FF after few years off Ed William son Sarasota FL placed 9th Wake recent team selection finals Sheeted-wing plane has auto-stab rudder twin turbul stars prop blades Ken Denise Phair celebrate Kens 1st FiC Octobers team selection finals also 85 US FAI Power team 0 C5 cQn co LENTY OF FREE PARKING AV SORN ROAD WIMONIUM TIMOffiUM52FAIROROIJNOS lOFAEOEgI TIMOREW S IE MARC SHOW MID ATLANTIC RADIO CONTROL JUNE 3 4 1989 Saturday- 9am 5pm Sunday- Qam 4pm MARYLAND STATE FAIR GROUNDS TIMONIUM MARYLAND Sponsored THE RADIO CONTROL MODELERS OF BALTIMORE SWAP SHOP $10 FULL TABLE PER DAY NO DEALERS PLEASE Pre-Registration CALL DON HANDS 301-788-5962 evenings FOR INFORMATION CONTACT MARC DIRECTORS JOHN KIRK & BRUCE PACKHAM 912 Cromwell Bridge Road Towson MD 21204 301-825-8138 301 -687-4945 Manual 3 control setup manual gives precise pushrod lengths both measure ments full-size pictures servo locations servo throws Its very complete follow Legend will hover perfectly first time out fourth manual Fly Again its good manual will help first-time Hel icopter pilot dont think too people will starting Legend however very stable hover detuned novice levels would acceptable training So theres first impression Legend kit Sparkling performance nice racy appear ance beautiful kit easy build Next month Im going delve little deeper mysteries piloting flybarless ship know lot whispers Out say ing flybarless models difficult cant taken seriously disagree Ive flown lots flybarless machines way American Commanders Horizons Kobe R 22s cutoff pro-heads fly little dif ferently case Legend offer decreased drag rotor simpler setup outstanding response penalty have understand slightly different tenden cies learn let help BCNU Hell Flap/Wang Continued page 67 swers Zillions different elegant lutions await discovery scien tific-minded individual twentieth century would well check possibility Adding flybar weight may improve Helicopter stability 10% playing around paddle properties might build another 5% what happens competitors have done too Adding flap feedback may improve stability 1% Adding Delta-3 might give ex tra 2% changing Bell-Hiller mix ing ratio might provide another 3% Put together though just might have competitive edge over rival contest field techniques have synergistic effect penny saved will lead buck Play around arrive ideal geometry squeezing maximum feedback gains par ticular model Ingenious tinkerers like yourself have helped make America technically progres sive country grass roots experimenta tion keeps technology lead Ap plying feedback concepts might take hours fiddling did anyone ever try tell easy shortcuts win ning contests borrow truism world physical fitness no pain no gain FF Duration/Joyner Continued page 71 up Reducing line tension might solve bending-boom problem will problems auto surfaces DT working HI TECH GLASS EPPLER 214 * 134 WINGSBob Fiorenze TOTAL ENERGY SPAR ASSEMBUES HP CELL WING SHEETING SKINSHobby Center Inc HI PERFORMANCE SAILPIANES otters hign gualOy tine eponres glass ninth keutuf lucoinete HP Cog soing Otteyting Complete Line Hobby Supplies skin vacuum hugging materials honeycomb bantee tubing tuselages und minge Complete pattial sss Custom US Distributor Yellow Aircraft morS bruchum send 500 SASE 0 sample 60 5000 Now available Fastcover Cterine Material VIGEO TAPE-VHS enttie HP cell song procron P tocluent Out tacount bagging tenboosue 50000 goho Visit Showroom 35 mm mm Disney World Shipeing & Handing HI PERFORMANCE SAILPLANES420 West SR 434 7002 NE thbth St. WOOdionSlo WAOROT2 205 0$T-t72tWinter Springs FL 32708407 327-6353 WE BUILD YOUR HELl TEST YOUR HELl REPAJR YOUR HELl 64% q 322 North 7th St ghton Pa 1823563 WRITE OR CALL FOR INFORMATION May1989 173 can remarkably improve stability per formance wont conquer Everest trio model Helicopter feedback sys tems theyre intended ultimate anlALATHES I179M00oS HETTLS -BOOKS -PREC0SIOIu ORSTOUMENTS ICOOn nf Otnool uCOMPLETE cSTLOG2Ou C ttO Oct00 nnoo Sprvnqfnnln tOn 05505 Conpoct 51513 3z2-0562 118-INCH3648 318-INCH3648 1181/808113/Sn 3182737 1/831161115318 n 1123041 11811413173/8 0 3/44460 1/80 3/81621 1/801/21724_____________________ 1/803/42533 3/18-INCH3048 3/18 3/181317 3/18 01/41419 3/18 3181621 3/16 ol/21825 3/16 0 3/42838 BALSA WOOD STICKS 1/16-INCH3640 1/1801/1808 1/1603/3207 1/181/80811 1/1631160913 1/16x1/41015 1/1603181317 1/181/21620 1/1803142128 3/32-INCH3648 1/4-INCH3848 3/32 3/320811 1/4 ii 1/41821 3/32 01/808131/403181825 3/3203/1610151/40 1/22129 3/32 0 1/413161/4 0 3143142 3/3203181419 3/320 1/21821 3/32 0 3142431 Double Balsa Wood Prices Spruce Basswood Sticks 5/18-INCH3848 5/18 ii 5/162027 5/1603/82230 5/18 o 1/22738 5/1603143952 1/2-INCH3640 1/201/23749 1/2 0 3149270 TRIANGULAR CUT BALSA 1/401/403624 3/8o3/8s3629 1/201/203637 3/4031403647 10103681 BALSA PLANKS 3/4s3036178 102036164 o3o36230 1 odo38303 202036230 203038329 204038484 3s3o38490 304038680 TAIBI BALSA SHEETS 1-INCH3648 1/18012736 3/32 0 13840 1/8013344 3/180 13749 1/4014157 3/8 0 15372 1/2018588 2-INCH3648 1/32023040 1/16023848 3/32 s 24154 1/8024880 3/18 s 25472 1/4028384 3/8s277103 1/302113150 3-INCH3848 1/32034053 1/16034358 3/32 0 35270 1/8036080 3/16037295 1/40384112 5/1603103134 3/803120160 1/203150200 4-INCH3648 1/32 0 46587 1/160473101 3/320482109 1/80495128 3/1604114151 1/404131193 3/804182271 1/2 04219320 BIRCH PLYWOOD 1/640120121751/40601274 1/64o12o243501/4o12o12146 1/640120407201/4012024293 1/6404004028001/4012048580 1/320606493/8012012180 1/32012012973/8o12o24360 1/32s 120241943/8o 12048720 1/320 12040388 _________________1/2 0 120 12202 1/16o6s124912o12o24405 1/16n12n1297l/2o12o48809 1/160 12024164 1/160 12040388 3/320601275 3/32120 12150 3/32 012024300 3/32 012 0 40608 1/80601282 1/8o12o12164 1/80 12024328 1/8012040656 3/16o6s1274 3/16o12012146 3/16 012024293 3/16 012048580 LITE PLYWOOD 1/801201258 1/80 12024112 1/8012040224 TAPERED TRAILING EDGE3648 1/80 1/22230 3/1603142940 1/40 14255 5/160 ir/s4461 3/8015272 Superior Aircraft Materials 12020-G Centralia iian Gardens California 90716 865-3220 Handling Charge-$500 $300 COD mum Order $2000 accept Personal Checks COD fornia Residents add 6% Sales Tax Consistently locked-up ie no auto surfac es model could Bob White has done years mount fuse stab trailing edge No lines no bending booms want use remote DT either fuse timer auto anything will have run some lines through boom solution route lines down center boom way line tension wont tend bend boom up down sideways last two models added t balsa bulkhead about three inches back inside big end boom small block scrap balsa added center 3/3 hole drilled through center ran piece Teflon tubing down through hole top boom just behind tube/boom joint tub ing makes gentle S-curve down through hole bulkhead DT line braided Da cron fishing line runs through tubing straight down center boom Plastic balsa No Im talking about old Aerogloss stuff red tube still make Ratlser Im talking about Rohacell Its rig id foam plastic material can used instead balsa modeling applications Former FlA World Champ Matt Gewain wife Gail run Composite Structures Technology sell Rohacell small quantities well some other high-tech modeling supplies Recently sent few samples play first glance material looks much like familiar pink blue extruded polystyrene foams used insulating houses Rohacell bright white feels much stiffer less spongy polystyrene foams fact compression modulus Rohacell about six times polystyrene close balsa Rohacell comes two densities thinner sheets 10 15 2mni 31 lb per cubic foot thicker stuff 3mm up 2 19 pcf European modelers have using Rohacell over 10 years now Two main construction techniques have developed system uses top bottom wing skins formed thin Rohacell spar inside skins formed jigs shaped match either upper lower airfoil curvature laminated epoxy-impregnated lightweight glass cloth both sides Rohacell skin way theres no need ribs other method involves carving sanding solid wing out thicker Rohacell adding spar covering both top bottom sur faces glass cloth Kevlar Theres very complete description latter method Heiko Rapp-Wurm National Free Flight Societys 1988 Symposium Rohacell can also used conven tional construction example thin Rohacell ribs capped thin carbon fiber will lighter stiffer conventional balsa ribs since theres no grain ribs can cut out sheet minlmum waste Unlike other plastic foams Rohacell affected cyanoacrylate adhesives dope polyester resin melt polystyrene foams Like plastic foam though need use adhesive hardens evapora tion such cyano epoxy thin cyano glue tried seemed take forever set thick stuff little better sure miss being able assemble things add glue didnt try accelerator might speed things up Unlike polystyrene foams Rohacell cant cut using hot wire Supposedly some deadly gas released material easy enough shape sandpaper biggest drawback Rohacell cost stuff expensive example 1 x 2-ft sheet 1mm $850 1 x 2 sheet l-in-thick foam $2850 plus shipping informa tion price list write Composite Structures Technology 3701 Inglewood Ave #268 Re dondo Beach CA 90278-1110 way also carry hard-to-find one-ounce-per-squareyard Kevlar cloth just thought Id pass along obseervation last team selection finals Matt nlfty portable weather station set up momtol wind speed direction Im sure about thc brand two sources similar equip ment Magnaphase Industries Inc 1502 Pike St NW Auburn WA 98001 Wind Weather Albion Street Water Tower PO Box 2320 Mendocino CA 95460 ELECTRIC SEMI-SCALE Radio Control Sport/Trainer Wing Spas 87 3/4 Length 37 1/2 PAUL K GUILLOW INC WAKEFIELD MA 01880 FF Indoor/Tenny Continued page 72 Send $15 $750 age 18 under NFFS 6146 East Cactus Wren Rd Scottsdale AZ 85253 FF Indoor fliers really owe selves support NFFSthe organization sponsors both FF Indoor contests Also dont forget Digest Sympo annual Free Flight Symposium Report two publi cationS make lot good material available us Spealting Free Flight Digest Editor Bob Meuser needs articlesboth FF Indoor Send input Bob 4200 Gregory St Oakland CA 94619 big show coming again 1989 United 174 Model Aviation TWO NEW FLIGHT BOXES Cowoletelo assewbled finished Made USA Both top qaalitp wood construclion Two torso drawers Unique drawer locks Swoll hoc 0 pluo shipping Large Son $12500 plus shippino includes fuel cowpartwentbatlery/power panel cowpartwentad/usfahle fuseluon cradles Mocep hank guarantee Seed $1 opens call 415 3637732 Inane oressuoc Fltghts Fancy erowodefiop P0 Son La Honda Ca 94020
Edition: Model Aviation - 1989/05
Page Numbers: 70, 71, 173, 174
BEEPER BELIEVER feeling familiar anyone has ever flown Free Flighta mix ture joy panic realize model has just maxed Out big thermaland its coming down Thats what feeling got fence about mile downwind annual Pensacola contest last June About time started over fence Jim Bradley pedaled up all-terrain bicycle Jim hopped off bike lifted over fence climbed over pedaled off after Nordic same thermal Wakefield Through small radio receiver Jims hand putting out its static-clouded squawk climbed back truck looped out main gate went driving after Jim Another mile downwind spotted Jims bicycle saw Jim off pasture Neither model sight Jims beeper picking up signal some woods farther downwind headed Brer Rabbit would have felt right home briar patch woods mixed pines hardwoods dense undergrowth bram bles blackberries quite ripe small scanner Jim carrying short whip tenna Jim used body direction finder would hold scanner agalnst chest slowly turn body signal dropped off would about-face head off direction spread out helped him search half hour headed back fly next round Jim stayed search Less hour later Jim pedaled back flight line model Despite several hours searching later afternoon next morning Wake beeper stays bur ied woods Believe next models will have some sort beeper board several com mercial units around Jim Bradley sells individ ual beeper well thats part elec tronic Nordic timer Jim Walston has developed sophisticatedand very lightweighttransmitter receiver directional antenna Gil Morris sells inexpensive transmitter kit Its teresting note folks east Mississippi addresses youd like information Bradley Model Products 1337 Pine Sap Ct Orlando FL 32825 Jim Walston Retrieval Systems 725 Cooper Lake Rd SE Smyrna GA 30080 Gil Morris 2810 Brackicy Rd Columbus OH 43220 Wakefield front ends unit photo graph slick-looking front end Poland Adam Tracy brought back Junior World Championships last sutmner work manship unbelievable looks like piece jewelry model part alumi num parts highly polished look chrome plated balsa nose block spinner finished deep red high-gloss lacquer Besides finish front end incorporates several unusual features bobbin bayonets 70 Model Aviation Free Flight Duration Louis Joyner 3657 Bmokwood Rd Blnnlngham AL 35223 Adam Tracy obtained fabulous Wakefield front end Poland 88 FF Jr World Champs appears production item Maybe some US entrepreneur will import Hooks prop hub rubberbands aid folding blades Info column Also Poland way Arizona aluminum engine mount/front fuselage Randy Archers FiC model Russian-style mechanical timer uses notched disc actuate autosurface functiona stacked-disc scroll dethermalizer actuation Doug Joyces custom fleid box provides preflight nest canard PlC plane Aluminum-skinned wing pops up DT onto rear shaft theres no chance off-center motor causing bobbin wobble hit inside motor tube Instead usual Montreal-style drop pin front end uses pivoting arm thats spring loaded Motor torque holds arm out torque drops off spring swings arm catches notch rim nose block Evidenfly front ends commercially made Lets hope somebody will begin importing drawings limited-production de layed prop release DPR front end Yugoslav ian Wake flier engineer Marjan Klenovsek making Like Russian DPR front end used Andrukov 1981 World Champs units holds propeller blades Out feathered launch After hard vertical launch clock work timer releases line wire arm blades go preset pitch setting begin turn everything works gain height something around 30 ft Note nor variable-pitch VP front end Marjan says tests have shown VP wasnt beneficial DPR DPR front end sells $145 plus postage Marjan also makes light simple reverse-Montreal front end thats $44 plus $4 postage Send payment dol lars check international department local bank sure include both side outside diameters motor tube Marjan can custom-fit front end address Marian Klenovsek Milcinskega 8 63000 Celje Yugoslavia Bending booms Its Catch-22s Free Flight make tail boom light enough wont strong enough After years trying build lightbut stifftail booms Wakefields decided step back take look real problem First question does boom bend Surely aerody namic loads 20% stab What about auto surface DT lines running through boom Thats like Typically control lines enter tail boom top just behind rear motor peg Any tension line will tend bend boom Continued page 173 May 1989 71 Back FF after few years off Ed William son Sarasota FL placed 9th Wake recent team selection finals Sheeted-wing plane has auto-stab rudder twin turbul stars prop blades Ken Denise Phair celebrate Kens 1st FiC Octobers team selection finals also 85 US FAI Power team 0 C5 cQn co LENTY OF FREE PARKING AV SORN ROAD WIMONIUM TIMOffiUM52FAIROROIJNOS lOFAEOEgI TIMOREW S IE MARC SHOW MID ATLANTIC RADIO CONTROL JUNE 3 4 1989 Saturday- 9am 5pm Sunday- Qam 4pm MARYLAND STATE FAIR GROUNDS TIMONIUM MARYLAND Sponsored THE RADIO CONTROL MODELERS OF BALTIMORE SWAP SHOP $10 FULL TABLE PER DAY NO DEALERS PLEASE Pre-Registration CALL DON HANDS 301-788-5962 evenings FOR INFORMATION CONTACT MARC DIRECTORS JOHN KIRK & BRUCE PACKHAM 912 Cromwell Bridge Road Towson MD 21204 301-825-8138 301 -687-4945 Manual 3 control setup manual gives precise pushrod lengths both measure ments full-size pictures servo locations servo throws Its very complete follow Legend will hover perfectly first time out fourth manual Fly Again its good manual will help first-time Hel icopter pilot dont think too people will starting Legend however very stable hover detuned novice levels would acceptable training So theres first impression Legend kit Sparkling performance nice racy appear ance beautiful kit easy build Next month Im going delve little deeper mysteries piloting flybarless ship know lot whispers Out say ing flybarless models difficult cant taken seriously disagree Ive flown lots flybarless machines way American Commanders Horizons Kobe R 22s cutoff pro-heads fly little dif ferently case Legend offer decreased drag rotor simpler setup outstanding response penalty have understand slightly different tenden cies learn let help BCNU Hell Flap/Wang Continued page 67 swers Zillions different elegant lutions await discovery scien tific-minded individual twentieth century would well check possibility Adding flybar weight may improve Helicopter stability 10% playing around paddle properties might build another 5% what happens competitors have done too Adding flap feedback may improve stability 1% Adding Delta-3 might give ex tra 2% changing Bell-Hiller mix ing ratio might provide another 3% Put together though just might have competitive edge over rival contest field techniques have synergistic effect penny saved will lead buck Play around arrive ideal geometry squeezing maximum feedback gains par ticular model Ingenious tinkerers like yourself have helped make America technically progres sive country grass roots experimenta tion keeps technology lead Ap plying feedback concepts might take hours fiddling did anyone ever try tell easy shortcuts win ning contests borrow truism world physical fitness no pain no gain FF Duration/Joyner Continued page 71 up Reducing line tension might solve bending-boom problem will problems auto surfaces DT working HI TECH GLASS EPPLER 214 * 134 WINGSBob Fiorenze TOTAL ENERGY SPAR ASSEMBUES HP CELL WING SHEETING SKINSHobby Center Inc HI PERFORMANCE SAILPIANES otters hign gualOy tine eponres glass ninth keutuf lucoinete HP Cog soing Otteyting Complete Line Hobby Supplies skin vacuum hugging materials honeycomb bantee tubing tuselages und minge Complete pattial sss Custom US Distributor Yellow Aircraft morS bruchum send 500 SASE 0 sample 60 5000 Now available Fastcover Cterine Material VIGEO TAPE-VHS enttie HP cell song procron P tocluent Out tacount bagging tenboosue 50000 goho Visit Showroom 35 mm mm Disney World Shipeing & Handing HI PERFORMANCE SAILPLANES420 West SR 434 7002 NE thbth St. WOOdionSlo WAOROT2 205 0$T-t72tWinter Springs FL 32708407 327-6353 WE BUILD YOUR HELl TEST YOUR HELl REPAJR YOUR HELl 64% q 322 North 7th St ghton Pa 1823563 WRITE OR CALL FOR INFORMATION May1989 173 can remarkably improve stability per formance wont conquer Everest trio model Helicopter feedback sys tems theyre intended ultimate anlALATHES I179M00oS HETTLS -BOOKS -PREC0SIOIu ORSTOUMENTS ICOOn nf Otnool uCOMPLETE cSTLOG2Ou C ttO Oct00 nnoo Sprvnqfnnln tOn 05505 Conpoct 51513 3z2-0562 118-INCH3648 318-INCH3648 1181/808113/Sn 3182737 1/831161115318 n 1123041 11811413173/8 0 3/44460 1/80 3/81621 1/801/21724_____________________ 1/803/42533 3/18-INCH3048 3/18 3/181317 3/18 01/41419 3/18 3181621 3/16 ol/21825 3/16 0 3/42838 BALSA WOOD STICKS 1/16-INCH3640 1/1801/1808 1/1603/3207 1/181/80811 1/1631160913 1/16x1/41015 1/1603181317 1/181/21620 1/1803142128 3/32-INCH3648 1/4-INCH3848 3/32 3/320811 1/4 ii 1/41821 3/32 01/808131/403181825 3/3203/1610151/40 1/22129 3/32 0 1/413161/4 0 3143142 3/3203181419 3/320 1/21821 3/32 0 3142431 Double Balsa Wood Prices Spruce Basswood Sticks 5/18-INCH3848 5/18 ii 5/162027 5/1603/82230 5/18 o 1/22738 5/1603143952 1/2-INCH3640 1/201/23749 1/2 0 3149270 TRIANGULAR CUT BALSA 1/401/403624 3/8o3/8s3629 1/201/203637 3/4031403647 10103681 BALSA PLANKS 3/4s3036178 102036164 o3o36230 1 odo38303 202036230 203038329 204038484 3s3o38490 304038680 TAIBI BALSA SHEETS 1-INCH3648 1/18012736 3/32 0 13840 1/8013344 3/180 13749 1/4014157 3/8 0 15372 1/2018588 2-INCH3648 1/32023040 1/16023848 3/32 s 24154 1/8024880 3/18 s 25472 1/4028384 3/8s277103 1/302113150 3-INCH3848 1/32034053 1/16034358 3/32 0 35270 1/8036080 3/16037295 1/40384112 5/1603103134 3/803120160 1/203150200 4-INCH3648 1/32 0 46587 1/160473101 3/320482109 1/80495128 3/1604114151 1/404131193 3/804182271 1/2 04219320 BIRCH PLYWOOD 1/640120121751/40601274 1/64o12o243501/4o12o12146 1/640120407201/4012024293 1/6404004028001/4012048580 1/320606493/8012012180 1/32012012973/8o12o24360 1/32s 120241943/8o 12048720 1/320 12040388 _________________1/2 0 120 12202 1/16o6s124912o12o24405 1/16n12n1297l/2o12o48809 1/160 12024164 1/160 12040388 3/320601275 3/32120 12150 3/32 012024300 3/32 012 0 40608 1/80601282 1/8o12o12164 1/80 12024328 1/8012040656 3/16o6s1274 3/16o12012146 3/16 012024293 3/16 012048580 LITE PLYWOOD 1/801201258 1/80 12024112 1/8012040224 TAPERED TRAILING EDGE3648 1/80 1/22230 3/1603142940 1/40 14255 5/160 ir/s4461 3/8015272 Superior Aircraft Materials 12020-G Centralia iian Gardens California 90716 865-3220 Handling Charge-$500 $300 COD mum Order $2000 accept Personal Checks COD fornia Residents add 6% Sales Tax Consistently locked-up ie no auto surfac es model could Bob White has done years mount fuse stab trailing edge No lines no bending booms want use remote DT either fuse timer auto anything will have run some lines through boom solution route lines down center boom way line tension wont tend bend boom up down sideways last two models added t balsa bulkhead about three inches back inside big end boom small block scrap balsa added center 3/3 hole drilled through center ran piece Teflon tubing down through hole top boom just behind tube/boom joint tub ing makes gentle S-curve down through hole bulkhead DT line braided Da cron fishing line runs through tubing straight down center boom Plastic balsa No Im talking about old Aerogloss stuff red tube still make Ratlser Im talking about Rohacell Its rig id foam plastic material can used instead balsa modeling applications Former FlA World Champ Matt Gewain wife Gail run Composite Structures Technology sell Rohacell small quantities well some other high-tech modeling supplies Recently sent few samples play first glance material looks much like familiar pink blue extruded polystyrene foams used insulating houses Rohacell bright white feels much stiffer less spongy polystyrene foams fact compression modulus Rohacell about six times polystyrene close balsa Rohacell comes two densities thinner sheets 10 15 2mni 31 lb per cubic foot thicker stuff 3mm up 2 19 pcf European modelers have using Rohacell over 10 years now Two main construction techniques have developed system uses top bottom wing skins formed thin Rohacell spar inside skins formed jigs shaped match either upper lower airfoil curvature laminated epoxy-impregnated lightweight glass cloth both sides Rohacell skin way theres no need ribs other method involves carving sanding solid wing out thicker Rohacell adding spar covering both top bottom sur faces glass cloth Kevlar Theres very complete description latter method Heiko Rapp-Wurm National Free Flight Societys 1988 Symposium Rohacell can also used conven tional construction example thin Rohacell ribs capped thin carbon fiber will lighter stiffer conventional balsa ribs since theres no grain ribs can cut out sheet minlmum waste Unlike other plastic foams Rohacell affected cyanoacrylate adhesives dope polyester resin melt polystyrene foams Like plastic foam though need use adhesive hardens evapora tion such cyano epoxy thin cyano glue tried seemed take forever set thick stuff little better sure miss being able assemble things add glue didnt try accelerator might speed things up Unlike polystyrene foams Rohacell cant cut using hot wire Supposedly some deadly gas released material easy enough shape sandpaper biggest drawback Rohacell cost stuff expensive example 1 x 2-ft sheet 1mm $850 1 x 2 sheet l-in-thick foam $2850 plus shipping informa tion price list write Composite Structures Technology 3701 Inglewood Ave #268 Re dondo Beach CA 90278-1110 way also carry hard-to-find one-ounce-per-squareyard Kevlar cloth just thought Id pass along obseervation last team selection finals Matt nlfty portable weather station set up momtol wind speed direction Im sure about thc brand two sources similar equip ment Magnaphase Industries Inc 1502 Pike St NW Auburn WA 98001 Wind Weather Albion Street Water Tower PO Box 2320 Mendocino CA 95460 ELECTRIC SEMI-SCALE Radio Control Sport/Trainer Wing Spas 87 3/4 Length 37 1/2 PAUL K GUILLOW INC WAKEFIELD MA 01880 FF Indoor/Tenny Continued page 72 Send $15 $750 age 18 under NFFS 6146 East Cactus Wren Rd Scottsdale AZ 85253 FF Indoor fliers really owe selves support NFFSthe organization sponsors both FF Indoor contests Also dont forget Digest Sympo annual Free Flight Symposium Report two publi cationS make lot good material available us Spealting Free Flight Digest Editor Bob Meuser needs articlesboth FF Indoor Send input Bob 4200 Gregory St Oakland CA 94619 big show coming again 1989 United 174 Model Aviation TWO NEW FLIGHT BOXES Cowoletelo assewbled finished Made USA Both top qaalitp wood construclion Two torso drawers Unique drawer locks Swoll hoc 0 pluo shipping Large Son $12500 plus shippino includes fuel cowpartwentbatlery/power panel cowpartwentad/usfahle fuseluon cradles Mocep hank guarantee Seed $1 opens call 415 3637732 Inane oressuoc Fltghts Fancy erowodefiop P0 Son La Honda Ca 94020
Edition: Model Aviation - 1989/05
Page Numbers: 70, 71, 173, 174
BEEPER BELIEVER feeling familiar anyone has ever flown Free Flighta mix ture joy panic realize model has just maxed Out big thermaland its coming down Thats what feeling got fence about mile downwind annual Pensacola contest last June About time started over fence Jim Bradley pedaled up all-terrain bicycle Jim hopped off bike lifted over fence climbed over pedaled off after Nordic same thermal Wakefield Through small radio receiver Jims hand putting out its static-clouded squawk climbed back truck looped out main gate went driving after Jim Another mile downwind spotted Jims bicycle saw Jim off pasture Neither model sight Jims beeper picking up signal some woods farther downwind headed Brer Rabbit would have felt right home briar patch woods mixed pines hardwoods dense undergrowth bram bles blackberries quite ripe small scanner Jim carrying short whip tenna Jim used body direction finder would hold scanner agalnst chest slowly turn body signal dropped off would about-face head off direction spread out helped him search half hour headed back fly next round Jim stayed search Less hour later Jim pedaled back flight line model Despite several hours searching later afternoon next morning Wake beeper stays bur ied woods Believe next models will have some sort beeper board several com mercial units around Jim Bradley sells individ ual beeper well thats part elec tronic Nordic timer Jim Walston has developed sophisticatedand very lightweighttransmitter receiver directional antenna Gil Morris sells inexpensive transmitter kit Its teresting note folks east Mississippi addresses youd like information Bradley Model Products 1337 Pine Sap Ct Orlando FL 32825 Jim Walston Retrieval Systems 725 Cooper Lake Rd SE Smyrna GA 30080 Gil Morris 2810 Brackicy Rd Columbus OH 43220 Wakefield front ends unit photo graph slick-looking front end Poland Adam Tracy brought back Junior World Championships last sutmner work manship unbelievable looks like piece jewelry model part alumi num parts highly polished look chrome plated balsa nose block spinner finished deep red high-gloss lacquer Besides finish front end incorporates several unusual features bobbin bayonets 70 Model Aviation Free Flight Duration Louis Joyner 3657 Bmokwood Rd Blnnlngham AL 35223 Adam Tracy obtained fabulous Wakefield front end Poland 88 FF Jr World Champs appears production item Maybe some US entrepreneur will import Hooks prop hub rubberbands aid folding blades Info column Also Poland way Arizona aluminum engine mount/front fuselage Randy Archers FiC model Russian-style mechanical timer uses notched disc actuate autosurface functiona stacked-disc scroll dethermalizer actuation Doug Joyces custom fleid box provides preflight nest canard PlC plane Aluminum-skinned wing pops up DT onto rear shaft theres no chance off-center motor causing bobbin wobble hit inside motor tube Instead usual Montreal-style drop pin front end uses pivoting arm thats spring loaded Motor torque holds arm out torque drops off spring swings arm catches notch rim nose block Evidenfly front ends commercially made Lets hope somebody will begin importing drawings limited-production de layed prop release DPR front end Yugoslav ian Wake flier engineer Marjan Klenovsek making Like Russian DPR front end used Andrukov 1981 World Champs units holds propeller blades Out feathered launch After hard vertical launch clock work timer releases line wire arm blades go preset pitch setting begin turn everything works gain height something around 30 ft Note nor variable-pitch VP front end Marjan says tests have shown VP wasnt beneficial DPR DPR front end sells $145 plus postage Marjan also makes light simple reverse-Montreal front end thats $44 plus $4 postage Send payment dol lars check international department local bank sure include both side outside diameters motor tube Marjan can custom-fit front end address Marian Klenovsek Milcinskega 8 63000 Celje Yugoslavia Bending booms Its Catch-22s Free Flight make tail boom light enough wont strong enough After years trying build lightbut stifftail booms Wakefields decided step back take look real problem First question does boom bend Surely aerody namic loads 20% stab What about auto surface DT lines running through boom Thats like Typically control lines enter tail boom top just behind rear motor peg Any tension line will tend bend boom Continued page 173 May 1989 71 Back FF after few years off Ed William son Sarasota FL placed 9th Wake recent team selection finals Sheeted-wing plane has auto-stab rudder twin turbul stars prop blades Ken Denise Phair celebrate Kens 1st FiC Octobers team selection finals also 85 US FAI Power team 0 C5 cQn co LENTY OF FREE PARKING AV SORN ROAD WIMONIUM TIMOffiUM52FAIROROIJNOS lOFAEOEgI TIMOREW S IE MARC SHOW MID ATLANTIC RADIO CONTROL JUNE 3 4 1989 Saturday- 9am 5pm Sunday- Qam 4pm MARYLAND STATE FAIR GROUNDS TIMONIUM MARYLAND Sponsored THE RADIO CONTROL MODELERS OF BALTIMORE SWAP SHOP $10 FULL TABLE PER DAY NO DEALERS PLEASE Pre-Registration CALL DON HANDS 301-788-5962 evenings FOR INFORMATION CONTACT MARC DIRECTORS JOHN KIRK & BRUCE PACKHAM 912 Cromwell Bridge Road Towson MD 21204 301-825-8138 301 -687-4945 Manual 3 control setup manual gives precise pushrod lengths both measure ments full-size pictures servo locations servo throws Its very complete follow Legend will hover perfectly first time out fourth manual Fly Again its good manual will help first-time Hel icopter pilot dont think too people will starting Legend however very stable hover detuned novice levels would acceptable training So theres first impression Legend kit Sparkling performance nice racy appear ance beautiful kit easy build Next month Im going delve little deeper mysteries piloting flybarless ship know lot whispers Out say ing flybarless models difficult cant taken seriously disagree Ive flown lots flybarless machines way American Commanders Horizons Kobe R 22s cutoff pro-heads fly little dif ferently case Legend offer decreased drag rotor simpler setup outstanding response penalty have understand slightly different tenden cies learn let help BCNU Hell Flap/Wang Continued page 67 swers Zillions different elegant lutions await discovery scien tific-minded individual twentieth century would well check possibility Adding flybar weight may improve Helicopter stability 10% playing around paddle properties might build another 5% what happens competitors have done too Adding flap feedback may improve stability 1% Adding Delta-3 might give ex tra 2% changing Bell-Hiller mix ing ratio might provide another 3% Put together though just might have competitive edge over rival contest field techniques have synergistic effect penny saved will lead buck Play around arrive ideal geometry squeezing maximum feedback gains par ticular model Ingenious tinkerers like yourself have helped make America technically progres sive country grass roots experimenta tion keeps technology lead Ap plying feedback concepts might take hours fiddling did anyone ever try tell easy shortcuts win ning contests borrow truism world physical fitness no pain no gain FF Duration/Joyner Continued page 71 up Reducing line tension might solve bending-boom problem will problems auto surfaces DT working HI TECH GLASS EPPLER 214 * 134 WINGSBob Fiorenze TOTAL ENERGY SPAR ASSEMBUES HP CELL WING SHEETING SKINSHobby Center Inc HI PERFORMANCE SAILPIANES otters hign gualOy tine eponres glass ninth keutuf lucoinete HP Cog soing Otteyting Complete Line Hobby Supplies skin vacuum hugging materials honeycomb bantee tubing tuselages und minge Complete pattial sss Custom US Distributor Yellow Aircraft morS bruchum send 500 SASE 0 sample 60 5000 Now available Fastcover Cterine Material VIGEO TAPE-VHS enttie HP cell song procron P tocluent Out tacount bagging tenboosue 50000 goho Visit Showroom 35 mm mm Disney World Shipeing & Handing HI PERFORMANCE SAILPLANES420 West SR 434 7002 NE thbth St. WOOdionSlo WAOROT2 205 0$T-t72tWinter Springs FL 32708407 327-6353 WE BUILD YOUR HELl TEST YOUR HELl REPAJR YOUR HELl 64% q 322 North 7th St ghton Pa 1823563 WRITE OR CALL FOR INFORMATION May1989 173 can remarkably improve stability per formance wont conquer Everest trio model Helicopter feedback sys tems theyre intended ultimate anlALATHES I179M00oS HETTLS -BOOKS -PREC0SIOIu ORSTOUMENTS ICOOn nf Otnool uCOMPLETE cSTLOG2Ou C ttO Oct00 nnoo Sprvnqfnnln tOn 05505 Conpoct 51513 3z2-0562 118-INCH3648 318-INCH3648 1181/808113/Sn 3182737 1/831161115318 n 1123041 11811413173/8 0 3/44460 1/80 3/81621 1/801/21724_____________________ 1/803/42533 3/18-INCH3048 3/18 3/181317 3/18 01/41419 3/18 3181621 3/16 ol/21825 3/16 0 3/42838 BALSA WOOD STICKS 1/16-INCH3640 1/1801/1808 1/1603/3207 1/181/80811 1/1631160913 1/16x1/41015 1/1603181317 1/181/21620 1/1803142128 3/32-INCH3648 1/4-INCH3848 3/32 3/320811 1/4 ii 1/41821 3/32 01/808131/403181825 3/3203/1610151/40 1/22129 3/32 0 1/413161/4 0 3143142 3/3203181419 3/320 1/21821 3/32 0 3142431 Double Balsa Wood Prices Spruce Basswood Sticks 5/18-INCH3848 5/18 ii 5/162027 5/1603/82230 5/18 o 1/22738 5/1603143952 1/2-INCH3640 1/201/23749 1/2 0 3149270 TRIANGULAR CUT BALSA 1/401/403624 3/8o3/8s3629 1/201/203637 3/4031403647 10103681 BALSA PLANKS 3/4s3036178 102036164 o3o36230 1 odo38303 202036230 203038329 204038484 3s3o38490 304038680 TAIBI BALSA SHEETS 1-INCH3648 1/18012736 3/32 0 13840 1/8013344 3/180 13749 1/4014157 3/8 0 15372 1/2018588 2-INCH3648 1/32023040 1/16023848 3/32 s 24154 1/8024880 3/18 s 25472 1/4028384 3/8s277103 1/302113150 3-INCH3848 1/32034053 1/16034358 3/32 0 35270 1/8036080 3/16037295 1/40384112 5/1603103134 3/803120160 1/203150200 4-INCH3648 1/32 0 46587 1/160473101 3/320482109 1/80495128 3/1604114151 1/404131193 3/804182271 1/2 04219320 BIRCH PLYWOOD 1/640120121751/40601274 1/64o12o243501/4o12o12146 1/640120407201/4012024293 1/6404004028001/4012048580 1/320606493/8012012180 1/32012012973/8o12o24360 1/32s 120241943/8o 12048720 1/320 12040388 _________________1/2 0 120 12202 1/16o6s124912o12o24405 1/16n12n1297l/2o12o48809 1/160 12024164 1/160 12040388 3/320601275 3/32120 12150 3/32 012024300 3/32 012 0 40608 1/80601282 1/8o12o12164 1/80 12024328 1/8012040656 3/16o6s1274 3/16o12012146 3/16 012024293 3/16 012048580 LITE PLYWOOD 1/801201258 1/80 12024112 1/8012040224 TAPERED TRAILING EDGE3648 1/80 1/22230 3/1603142940 1/40 14255 5/160 ir/s4461 3/8015272 Superior Aircraft Materials 12020-G Centralia iian Gardens California 90716 865-3220 Handling Charge-$500 $300 COD mum Order $2000 accept Personal Checks COD fornia Residents add 6% Sales Tax Consistently locked-up ie no auto surfac es model could Bob White has done years mount fuse stab trailing edge No lines no bending booms want use remote DT either fuse timer auto anything will have run some lines through boom solution route lines down center boom way line tension wont tend bend boom up down sideways last two models added t balsa bulkhead about three inches back inside big end boom small block scrap balsa added center 3/3 hole drilled through center ran piece Teflon tubing down through hole top boom just behind tube/boom joint tub ing makes gentle S-curve down through hole bulkhead DT line braided Da cron fishing line runs through tubing straight down center boom Plastic balsa No Im talking about old Aerogloss stuff red tube still make Ratlser Im talking about Rohacell Its rig id foam plastic material can used instead balsa modeling applications Former FlA World Champ Matt Gewain wife Gail run Composite Structures Technology sell Rohacell small quantities well some other high-tech modeling supplies Recently sent few samples play first glance material looks much like familiar pink blue extruded polystyrene foams used insulating houses Rohacell bright white feels much stiffer less spongy polystyrene foams fact compression modulus Rohacell about six times polystyrene close balsa Rohacell comes two densities thinner sheets 10 15 2mni 31 lb per cubic foot thicker stuff 3mm up 2 19 pcf European modelers have using Rohacell over 10 years now Two main construction techniques have developed system uses top bottom wing skins formed thin Rohacell spar inside skins formed jigs shaped match either upper lower airfoil curvature laminated epoxy-impregnated lightweight glass cloth both sides Rohacell skin way theres no need ribs other method involves carving sanding solid wing out thicker Rohacell adding spar covering both top bottom sur faces glass cloth Kevlar Theres very complete description latter method Heiko Rapp-Wurm National Free Flight Societys 1988 Symposium Rohacell can also used conven tional construction example thin Rohacell ribs capped thin carbon fiber will lighter stiffer conventional balsa ribs since theres no grain ribs can cut out sheet minlmum waste Unlike other plastic foams Rohacell affected cyanoacrylate adhesives dope polyester resin melt polystyrene foams Like plastic foam though need use adhesive hardens evapora tion such cyano epoxy thin cyano glue tried seemed take forever set thick stuff little better sure miss being able assemble things add glue didnt try accelerator might speed things up Unlike polystyrene foams Rohacell cant cut using hot wire Supposedly some deadly gas released material easy enough shape sandpaper biggest drawback Rohacell cost stuff expensive example 1 x 2-ft sheet 1mm $850 1 x 2 sheet l-in-thick foam $2850 plus shipping informa tion price list write Composite Structures Technology 3701 Inglewood Ave #268 Re dondo Beach CA 90278-1110 way also carry hard-to-find one-ounce-per-squareyard Kevlar cloth just thought Id pass along obseervation last team selection finals Matt nlfty portable weather station set up momtol wind speed direction Im sure about thc brand two sources similar equip ment Magnaphase Industries Inc 1502 Pike St NW Auburn WA 98001 Wind Weather Albion Street Water Tower PO Box 2320 Mendocino CA 95460 ELECTRIC SEMI-SCALE Radio Control Sport/Trainer Wing Spas 87 3/4 Length 37 1/2 PAUL K GUILLOW INC WAKEFIELD MA 01880 FF Indoor/Tenny Continued page 72 Send $15 $750 age 18 under NFFS 6146 East Cactus Wren Rd Scottsdale AZ 85253 FF Indoor fliers really owe selves support NFFSthe organization sponsors both FF Indoor contests Also dont forget Digest Sympo annual Free Flight Symposium Report two publi cationS make lot good material available us Spealting Free Flight Digest Editor Bob Meuser needs articlesboth FF Indoor Send input Bob 4200 Gregory St Oakland CA 94619 big show coming again 1989 United 174 Model Aviation TWO NEW FLIGHT BOXES Cowoletelo assewbled finished Made USA Both top qaalitp wood construclion Two torso drawers Unique drawer locks Swoll hoc 0 pluo shipping Large Son $12500 plus shippino includes fuel cowpartwentbatlery/power panel cowpartwentad/usfahle fuseluon cradles Mocep hank guarantee Seed $1 opens call 415 3637732 Inane oressuoc Fltghts Fancy erowodefiop P0 Son La Honda Ca 94020
Edition: Model Aviation - 1989/05
Page Numbers: 70, 71, 173, 174
BEEPER BELIEVER feeling familiar anyone has ever flown Free Flighta mix ture joy panic realize model has just maxed Out big thermaland its coming down Thats what feeling got fence about mile downwind annual Pensacola contest last June About time started over fence Jim Bradley pedaled up all-terrain bicycle Jim hopped off bike lifted over fence climbed over pedaled off after Nordic same thermal Wakefield Through small radio receiver Jims hand putting out its static-clouded squawk climbed back truck looped out main gate went driving after Jim Another mile downwind spotted Jims bicycle saw Jim off pasture Neither model sight Jims beeper picking up signal some woods farther downwind headed Brer Rabbit would have felt right home briar patch woods mixed pines hardwoods dense undergrowth bram bles blackberries quite ripe small scanner Jim carrying short whip tenna Jim used body direction finder would hold scanner agalnst chest slowly turn body signal dropped off would about-face head off direction spread out helped him search half hour headed back fly next round Jim stayed search Less hour later Jim pedaled back flight line model Despite several hours searching later afternoon next morning Wake beeper stays bur ied woods Believe next models will have some sort beeper board several com mercial units around Jim Bradley sells individ ual beeper well thats part elec tronic Nordic timer Jim Walston has developed sophisticatedand very lightweighttransmitter receiver directional antenna Gil Morris sells inexpensive transmitter kit Its teresting note folks east Mississippi addresses youd like information Bradley Model Products 1337 Pine Sap Ct Orlando FL 32825 Jim Walston Retrieval Systems 725 Cooper Lake Rd SE Smyrna GA 30080 Gil Morris 2810 Brackicy Rd Columbus OH 43220 Wakefield front ends unit photo graph slick-looking front end Poland Adam Tracy brought back Junior World Championships last sutmner work manship unbelievable looks like piece jewelry model part alumi num parts highly polished look chrome plated balsa nose block spinner finished deep red high-gloss lacquer Besides finish front end incorporates several unusual features bobbin bayonets 70 Model Aviation Free Flight Duration Louis Joyner 3657 Bmokwood Rd Blnnlngham AL 35223 Adam Tracy obtained fabulous Wakefield front end Poland 88 FF Jr World Champs appears production item Maybe some US entrepreneur will import Hooks prop hub rubberbands aid folding blades Info column Also Poland way Arizona aluminum engine mount/front fuselage Randy Archers FiC model Russian-style mechanical timer uses notched disc actuate autosurface functiona stacked-disc scroll dethermalizer actuation Doug Joyces custom fleid box provides preflight nest canard PlC plane Aluminum-skinned wing pops up DT onto rear shaft theres no chance off-center motor causing bobbin wobble hit inside motor tube Instead usual Montreal-style drop pin front end uses pivoting arm thats spring loaded Motor torque holds arm out torque drops off spring swings arm catches notch rim nose block Evidenfly front ends commercially made Lets hope somebody will begin importing drawings limited-production de layed prop release DPR front end Yugoslav ian Wake flier engineer Marjan Klenovsek making Like Russian DPR front end used Andrukov 1981 World Champs units holds propeller blades Out feathered launch After hard vertical launch clock work timer releases line wire arm blades go preset pitch setting begin turn everything works gain height something around 30 ft Note nor variable-pitch VP front end Marjan says tests have shown VP wasnt beneficial DPR DPR front end sells $145 plus postage Marjan also makes light simple reverse-Montreal front end thats $44 plus $4 postage Send payment dol lars check international department local bank sure include both side outside diameters motor tube Marjan can custom-fit front end address Marian Klenovsek Milcinskega 8 63000 Celje Yugoslavia Bending booms Its Catch-22s Free Flight make tail boom light enough wont strong enough After years trying build lightbut stifftail booms Wakefields decided step back take look real problem First question does boom bend Surely aerody namic loads 20% stab What about auto surface DT lines running through boom Thats like Typically control lines enter tail boom top just behind rear motor peg Any tension line will tend bend boom Continued page 173 May 1989 71 Back FF after few years off Ed William son Sarasota FL placed 9th Wake recent team selection finals Sheeted-wing plane has auto-stab rudder twin turbul stars prop blades Ken Denise Phair celebrate Kens 1st FiC Octobers team selection finals also 85 US FAI Power team 0 C5 cQn co LENTY OF FREE PARKING AV SORN ROAD WIMONIUM TIMOffiUM52FAIROROIJNOS lOFAEOEgI TIMOREW S IE MARC SHOW MID ATLANTIC RADIO CONTROL JUNE 3 4 1989 Saturday- 9am 5pm Sunday- Qam 4pm MARYLAND STATE FAIR GROUNDS TIMONIUM MARYLAND Sponsored THE RADIO CONTROL MODELERS OF BALTIMORE SWAP SHOP $10 FULL TABLE PER DAY NO DEALERS PLEASE Pre-Registration CALL DON HANDS 301-788-5962 evenings FOR INFORMATION CONTACT MARC DIRECTORS JOHN KIRK & BRUCE PACKHAM 912 Cromwell Bridge Road Towson MD 21204 301-825-8138 301 -687-4945 Manual 3 control setup manual gives precise pushrod lengths both measure ments full-size pictures servo locations servo throws Its very complete follow Legend will hover perfectly first time out fourth manual Fly Again its good manual will help first-time Hel icopter pilot dont think too people will starting Legend however very stable hover detuned novice levels would acceptable training So theres first impression Legend kit Sparkling performance nice racy appear ance beautiful kit easy build Next month Im going delve little deeper mysteries piloting flybarless ship know lot whispers Out say ing flybarless models difficult cant taken seriously disagree Ive flown lots flybarless machines way American Commanders Horizons Kobe R 22s cutoff pro-heads fly little dif ferently case Legend offer decreased drag rotor simpler setup outstanding response penalty have understand slightly different tenden cies learn let help BCNU Hell Flap/Wang Continued page 67 swers Zillions different elegant lutions await discovery scien tific-minded individual twentieth century would well check possibility Adding flybar weight may improve Helicopter stability 10% playing around paddle properties might build another 5% what happens competitors have done too Adding flap feedback may improve stability 1% Adding Delta-3 might give ex tra 2% changing Bell-Hiller mix ing ratio might provide another 3% Put together though just might have competitive edge over rival contest field techniques have synergistic effect penny saved will lead buck Play around arrive ideal geometry squeezing maximum feedback gains par ticular model Ingenious tinkerers like yourself have helped make America technically progres sive country grass roots experimenta tion keeps technology lead Ap plying feedback concepts might take hours fiddling did anyone ever try tell easy shortcuts win ning contests borrow truism world physical fitness no pain no gain FF Duration/Joyner Continued page 71 up Reducing line tension might solve bending-boom problem will problems auto surfaces DT working HI TECH GLASS EPPLER 214 * 134 WINGSBob Fiorenze TOTAL ENERGY SPAR ASSEMBUES HP CELL WING SHEETING SKINSHobby Center Inc HI PERFORMANCE SAILPIANES otters hign gualOy tine eponres glass ninth keutuf lucoinete HP Cog soing Otteyting Complete Line Hobby Supplies skin vacuum hugging materials honeycomb bantee tubing tuselages und minge Complete pattial sss Custom US Distributor Yellow Aircraft morS bruchum send 500 SASE 0 sample 60 5000 Now available Fastcover Cterine Material VIGEO TAPE-VHS enttie HP cell song procron P tocluent Out tacount bagging tenboosue 50000 goho Visit Showroom 35 mm mm Disney World Shipeing & Handing HI PERFORMANCE SAILPLANES420 West SR 434 7002 NE thbth St. WOOdionSlo WAOROT2 205 0$T-t72tWinter Springs FL 32708407 327-6353 WE BUILD YOUR HELl TEST YOUR HELl REPAJR YOUR HELl 64% q 322 North 7th St ghton Pa 1823563 WRITE OR CALL FOR INFORMATION May1989 173 can remarkably improve stability per formance wont conquer Everest trio model Helicopter feedback sys tems theyre intended ultimate anlALATHES I179M00oS HETTLS -BOOKS -PREC0SIOIu ORSTOUMENTS ICOOn nf Otnool uCOMPLETE cSTLOG2Ou C ttO Oct00 nnoo Sprvnqfnnln tOn 05505 Conpoct 51513 3z2-0562 118-INCH3648 318-INCH3648 1181/808113/Sn 3182737 1/831161115318 n 1123041 11811413173/8 0 3/44460 1/80 3/81621 1/801/21724_____________________ 1/803/42533 3/18-INCH3048 3/18 3/181317 3/18 01/41419 3/18 3181621 3/16 ol/21825 3/16 0 3/42838 BALSA WOOD STICKS 1/16-INCH3640 1/1801/1808 1/1603/3207 1/181/80811 1/1631160913 1/16x1/41015 1/1603181317 1/181/21620 1/1803142128 3/32-INCH3648 1/4-INCH3848 3/32 3/320811 1/4 ii 1/41821 3/32 01/808131/403181825 3/3203/1610151/40 1/22129 3/32 0 1/413161/4 0 3143142 3/3203181419 3/320 1/21821 3/32 0 3142431 Double Balsa Wood Prices Spruce Basswood Sticks 5/18-INCH3848 5/18 ii 5/162027 5/1603/82230 5/18 o 1/22738 5/1603143952 1/2-INCH3640 1/201/23749 1/2 0 3149270 TRIANGULAR CUT BALSA 1/401/403624 3/8o3/8s3629 1/201/203637 3/4031403647 10103681 BALSA PLANKS 3/4s3036178 102036164 o3o36230 1 odo38303 202036230 203038329 204038484 3s3o38490 304038680 TAIBI BALSA SHEETS 1-INCH3648 1/18012736 3/32 0 13840 1/8013344 3/180 13749 1/4014157 3/8 0 15372 1/2018588 2-INCH3648 1/32023040 1/16023848 3/32 s 24154 1/8024880 3/18 s 25472 1/4028384 3/8s277103 1/302113150 3-INCH3848 1/32034053 1/16034358 3/32 0 35270 1/8036080 3/16037295 1/40384112 5/1603103134 3/803120160 1/203150200 4-INCH3648 1/32 0 46587 1/160473101 3/320482109 1/80495128 3/1604114151 1/404131193 3/804182271 1/2 04219320 BIRCH PLYWOOD 1/640120121751/40601274 1/64o12o243501/4o12o12146 1/640120407201/4012024293 1/6404004028001/4012048580 1/320606493/8012012180 1/32012012973/8o12o24360 1/32s 120241943/8o 12048720 1/320 12040388 _________________1/2 0 120 12202 1/16o6s124912o12o24405 1/16n12n1297l/2o12o48809 1/160 12024164 1/160 12040388 3/320601275 3/32120 12150 3/32 012024300 3/32 012 0 40608 1/80601282 1/8o12o12164 1/80 12024328 1/8012040656 3/16o6s1274 3/16o12012146 3/16 012024293 3/16 012048580 LITE PLYWOOD 1/801201258 1/80 12024112 1/8012040224 TAPERED TRAILING EDGE3648 1/80 1/22230 3/1603142940 1/40 14255 5/160 ir/s4461 3/8015272 Superior Aircraft Materials 12020-G Centralia iian Gardens California 90716 865-3220 Handling Charge-$500 $300 COD mum Order $2000 accept Personal Checks COD fornia Residents add 6% Sales Tax Consistently locked-up ie no auto surfac es model could Bob White has done years mount fuse stab trailing edge No lines no bending booms want use remote DT either fuse timer auto anything will have run some lines through boom solution route lines down center boom way line tension wont tend bend boom up down sideways last two models added t balsa bulkhead about three inches back inside big end boom small block scrap balsa added center 3/3 hole drilled through center ran piece Teflon tubing down through hole top boom just behind tube/boom joint tub ing makes gentle S-curve down through hole bulkhead DT line braided Da cron fishing line runs through tubing straight down center boom Plastic balsa No Im talking about old Aerogloss stuff red tube still make Ratlser Im talking about Rohacell Its rig id foam plastic material can used instead balsa modeling applications Former FlA World Champ Matt Gewain wife Gail run Composite Structures Technology sell Rohacell small quantities well some other high-tech modeling supplies Recently sent few samples play first glance material looks much like familiar pink blue extruded polystyrene foams used insulating houses Rohacell bright white feels much stiffer less spongy polystyrene foams fact compression modulus Rohacell about six times polystyrene close balsa Rohacell comes two densities thinner sheets 10 15 2mni 31 lb per cubic foot thicker stuff 3mm up 2 19 pcf European modelers have using Rohacell over 10 years now Two main construction techniques have developed system uses top bottom wing skins formed thin Rohacell spar inside skins formed jigs shaped match either upper lower airfoil curvature laminated epoxy-impregnated lightweight glass cloth both sides Rohacell skin way theres no need ribs other method involves carving sanding solid wing out thicker Rohacell adding spar covering both top bottom sur faces glass cloth Kevlar Theres very complete description latter method Heiko Rapp-Wurm National Free Flight Societys 1988 Symposium Rohacell can also used conven tional construction example thin Rohacell ribs capped thin carbon fiber will lighter stiffer conventional balsa ribs since theres no grain ribs can cut out sheet minlmum waste Unlike other plastic foams Rohacell affected cyanoacrylate adhesives dope polyester resin melt polystyrene foams Like plastic foam though need use adhesive hardens evapora tion such cyano epoxy thin cyano glue tried seemed take forever set thick stuff little better sure miss being able assemble things add glue didnt try accelerator might speed things up Unlike polystyrene foams Rohacell cant cut using hot wire Supposedly some deadly gas released material easy enough shape sandpaper biggest drawback Rohacell cost stuff expensive example 1 x 2-ft sheet 1mm $850 1 x 2 sheet l-in-thick foam $2850 plus shipping informa tion price list write Composite Structures Technology 3701 Inglewood Ave #268 Re dondo Beach CA 90278-1110 way also carry hard-to-find one-ounce-per-squareyard Kevlar cloth just thought Id pass along obseervation last team selection finals Matt nlfty portable weather station set up momtol wind speed direction Im sure about thc brand two sources similar equip ment Magnaphase Industries Inc 1502 Pike St NW Auburn WA 98001 Wind Weather Albion Street Water Tower PO Box 2320 Mendocino CA 95460 ELECTRIC SEMI-SCALE Radio Control Sport/Trainer Wing Spas 87 3/4 Length 37 1/2 PAUL K GUILLOW INC WAKEFIELD MA 01880 FF Indoor/Tenny Continued page 72 Send $15 $750 age 18 under NFFS 6146 East Cactus Wren Rd Scottsdale AZ 85253 FF Indoor fliers really owe selves support NFFSthe organization sponsors both FF Indoor contests Also dont forget Digest Sympo annual Free Flight Symposium Report two publi cationS make lot good material available us Spealting Free Flight Digest Editor Bob Meuser needs articlesboth FF Indoor Send input Bob 4200 Gregory St Oakland CA 94619 big show coming again 1989 United 174 Model Aviation TWO NEW FLIGHT BOXES Cowoletelo assewbled finished Made USA Both top qaalitp wood construclion Two torso drawers Unique drawer locks Swoll hoc 0 pluo shipping Large Son $12500 plus shippino includes fuel cowpartwentbatlery/power panel cowpartwentad/usfahle fuseluon cradles Mocep hank guarantee Seed $1 opens call 415 3637732 Inane oressuoc Fltghts Fancy erowodefiop P0 Son La Honda Ca 94020