d Timers Put Stop Compared glow engine ignition engine has quite good fuel economy youve never dwelt thought before surely will first time timer fails stop engine ship climbs until its out fuel Ohlsson 60 Playboy Senior climbed mere speck sky recently stock tank fuel Over-runs have plagued free fighters decades probably will come thats small consolation Excluding occasional failure start timer launching timer malfunction erraticness just plain mechanical failure can set building schedule back months say nothing cost replacing lost model Some pretty good hardware becoming available contemporary fliers extent engine and/or prop brakes Old-Timer free-fighter still pretty much own far timers con cerned once popular Air-draulic timers made Austin craft others still available will certainly job sport flying However difficult adjust accurately con sistency can vary point suitable competition fliers solve problem simply attaching microswitch modern clock work timer few alterations timer arm enable trip switch positively stopping engine accompanying photos KMart camera timer has adapted use fabrication mounting plate timer microswitch Radio Shack stop-start lever have mounted entire timer sembly built under $7 30 min utes spare time reliability timer tops spare components easily obtainable Ive switched system exclusively word caution new flier Dont use modern fuel shut-off timers ignition system may effectively stop engine allow flight bat teries drain down possible damage ignition components subject timers modelers dislike use fuse-actuated dethermalizers incorporate mechanical timers purpose Commercial timers usually limited five minutes may too short duration some spe cial events photos shows de thermalizer timer made ordinary one-hour kitchen timer fabrication such timer usually requires some experi mental tinkering very satisfactory tim ers can result would want such timer about faint-hearted Texaco flier unwilling commit ship continued page 94 Ckrence Haught Right Bill Cronk AC assist Cloud King built Model Aviation plans 2-channel Expert radio Alternate Fox 35 ST 15 diesel Photo Jerry Farr months old-timer event see text Lanzo Record Breaker 02-powered replica built David Haught flown Antique ever available High fun low cost 1j September 1976 45 Simple inexpensive timer fabricated KMart camera timer Radio Shack microswitch Screw locknut tapped timer wheel actuates switch lever Below Mike Michalask won combined rubber 02 Replica Jr CAMS Old-Timer bash Classic air-draulic timer operates air bleed against opposing spring principle Touchy ad justnot good contest work Radio Technique/Myers continued page 10 read out digits larger number significant digits currently avail able analog instruments Several folks have developed prototype instruments seen mainly around pylon meets commercial digital tachometers available prices around $175 price barrier has hard break since components scratch-built tach ometer usually cost neighborhood $60 order make profit relatively small number sales RC fraternity offers price would larger price RC systems things sat until Modelcraft Electronics PO Box 970 Lomita CA 90717 offered Digivue Tach ometer kit $4950 good friend Bob Aberle W2QPP offered use recently opportunity use field found instrument fits easily hand indicates rpm large bright display Digits about 7/16 high 1/4 wide can seen under lighting conditions except high noon clear sky time some shade wrist necessary can see well enough fly tachometer can see well enough read propeller rpm although found trouble making up its mind under overcast sky discussed problem manufacturer told make sure tachometer could look light-colored background FF Old-Timers/Haught continued page 45 hour needs ten min utes win wind coming up Balsa Board Foot Poring over favorite Old-Timer plan sometimes results some strange least scarce used low-light conditions tried it helped Im sure unit will compared well-proven Heathkit Thumb Tach compared Thumb Tach calibrated 200 rpm units low scale Digivue Tach indicates 100 rpm uncer tainty 50 Id rate about equal margin going Heathkit high scale Heathkit calibrated 1000 rpm units Digivue remains 100 rpm 1 100 Clearly Digivue has accomplished its purpose offers significant digit Heathkit low-light condi tions Heathkit either indicates cor rect rpm nothing Digivue capable locking up wrong answer must exercise some care doubt people would misled once gained some familiarity instrument Heathkit can switched left standing its builtin support use both hands something else As supplied Digivue has switch must held dont like its easy change Overall market tachometer feel either units good buy case hope have now explained benefit have requested schematic diagram digital tachometer dont plan offer column cant beat price boys have requests items would like see column address 70 Froehlich Farm Rd Hicksville NY 11801 balsa sizes times odd sizes further complicated lengths over four ft Perhaps lumber list dream ship runs figures wallet cannot accommodate possible solution problem could looking local lumber yard cities moderate size exists lumber yard carries balsa logs willing special order logs really logs rough sawn boards 4 4 approximately 5 average price locally such log under $5 Densities vary sometimes defect will render portion board unusable part consider able balsa good quality can obtained boards moderate price cut board usable and/or cus tom sizes first have two opposite sides trued up thickness planer Dimensional stock can now cut ordinary table saw using hollow ground blade may have cut both sides thicker pieces avoid overloading saw cut stock slightly oversize finish sanding disc table saw will get considerable balsa dust over thing operation its good cause wont run balsa suppliers out business cutting own will find awkward sizes no longer problem splicing length forgotten curse Scraps make good wing tip blocks other filler pieces dont throw away Old-Timer Event Month020 Replica If have never flown OldTimer before idea kind intrigues 020 Replica painless way try wings speak 020 Replica categorized special event Soci ety Antique Modelers offered nearly Old-Timer contest often included Old-Time event AMA contests SAM defines 020 Replica model gas model kitted plans published prior January 1943 Power restricted 020 engines no minimum weight rules fine kits available through commercial sources Old-Timer possible subject scaled down event fact some old class-A ships al ready right size about 36-in span need beefing down structurally ideal Keep structure same reduce wood sizes save weight Most old class-A ships Y8-in sq 3/16-in sq longerons 3/32-in q will suffice 020 Replica popularity event readily ap parent observing entry lists con tests offering class Some designs course competitive others models have appearing greater numbers Some contests late have dividing Old-Timer Antique categories order provide better com petitive base has move right direction Antique models would defined designed published prior De cember 31 1938 classic designs popularized during period few match later pylon ships would surprised 020 Replica continues grow see further break down between cabin pylon models 020 Replicas usually easy adjust fly require large building benches consume large amounts materials supplies conven ient transport flying field beware contagious truly great way get Old-Timer Just received word Bill Hale Con test Coordinator 10th Annual Na tional Old-Timer Championships held Dayton OH July 31 through August 2 bean fest evening fore July 30 Contact Bill 334 N Remington Rd Columbus OH 43209 enter separate events B C Cabin Pylon plus 30-second Antique 020 Replica Scale Combined Rubber 049 Old-Timer Power free fighters Radio Control events Texaco Antique Class B C Ohio just place years family vaca tion Keep sending cards letters RouteS Box 16 Coeur dAlene ID 83814 94 Model Aviation Lower timer commercial Tatone microswitch added Upper timer DT made ordinary 1-hr kitchen timer Reduces worry
Edition: Model Aviation - 1976/09
Page Numbers: 45, 94
d Timers Put Stop Compared glow engine ignition engine has quite good fuel economy youve never dwelt thought before surely will first time timer fails stop engine ship climbs until its out fuel Ohlsson 60 Playboy Senior climbed mere speck sky recently stock tank fuel Over-runs have plagued free fighters decades probably will come thats small consolation Excluding occasional failure start timer launching timer malfunction erraticness just plain mechanical failure can set building schedule back months say nothing cost replacing lost model Some pretty good hardware becoming available contemporary fliers extent engine and/or prop brakes Old-Timer free-fighter still pretty much own far timers con cerned once popular Air-draulic timers made Austin craft others still available will certainly job sport flying However difficult adjust accurately con sistency can vary point suitable competition fliers solve problem simply attaching microswitch modern clock work timer few alterations timer arm enable trip switch positively stopping engine accompanying photos KMart camera timer has adapted use fabrication mounting plate timer microswitch Radio Shack stop-start lever have mounted entire timer sembly built under $7 30 min utes spare time reliability timer tops spare components easily obtainable Ive switched system exclusively word caution new flier Dont use modern fuel shut-off timers ignition system may effectively stop engine allow flight bat teries drain down possible damage ignition components subject timers modelers dislike use fuse-actuated dethermalizers incorporate mechanical timers purpose Commercial timers usually limited five minutes may too short duration some spe cial events photos shows de thermalizer timer made ordinary one-hour kitchen timer fabrication such timer usually requires some experi mental tinkering very satisfactory tim ers can result would want such timer about faint-hearted Texaco flier unwilling commit ship continued page 94 Ckrence Haught Right Bill Cronk AC assist Cloud King built Model Aviation plans 2-channel Expert radio Alternate Fox 35 ST 15 diesel Photo Jerry Farr months old-timer event see text Lanzo Record Breaker 02-powered replica built David Haught flown Antique ever available High fun low cost 1j September 1976 45 Simple inexpensive timer fabricated KMart camera timer Radio Shack microswitch Screw locknut tapped timer wheel actuates switch lever Below Mike Michalask won combined rubber 02 Replica Jr CAMS Old-Timer bash Classic air-draulic timer operates air bleed against opposing spring principle Touchy ad justnot good contest work Radio Technique/Myers continued page 10 read out digits larger number significant digits currently avail able analog instruments Several folks have developed prototype instruments seen mainly around pylon meets commercial digital tachometers available prices around $175 price barrier has hard break since components scratch-built tach ometer usually cost neighborhood $60 order make profit relatively small number sales RC fraternity offers price would larger price RC systems things sat until Modelcraft Electronics PO Box 970 Lomita CA 90717 offered Digivue Tach ometer kit $4950 good friend Bob Aberle W2QPP offered use recently opportunity use field found instrument fits easily hand indicates rpm large bright display Digits about 7/16 high 1/4 wide can seen under lighting conditions except high noon clear sky time some shade wrist necessary can see well enough fly tachometer can see well enough read propeller rpm although found trouble making up its mind under overcast sky discussed problem manufacturer told make sure tachometer could look light-colored background FF Old-Timers/Haught continued page 45 hour needs ten min utes win wind coming up Balsa Board Foot Poring over favorite Old-Timer plan sometimes results some strange least scarce used low-light conditions tried it helped Im sure unit will compared well-proven Heathkit Thumb Tach compared Thumb Tach calibrated 200 rpm units low scale Digivue Tach indicates 100 rpm uncer tainty 50 Id rate about equal margin going Heathkit high scale Heathkit calibrated 1000 rpm units Digivue remains 100 rpm 1 100 Clearly Digivue has accomplished its purpose offers significant digit Heathkit low-light condi tions Heathkit either indicates cor rect rpm nothing Digivue capable locking up wrong answer must exercise some care doubt people would misled once gained some familiarity instrument Heathkit can switched left standing its builtin support use both hands something else As supplied Digivue has switch must held dont like its easy change Overall market tachometer feel either units good buy case hope have now explained benefit have requested schematic diagram digital tachometer dont plan offer column cant beat price boys have requests items would like see column address 70 Froehlich Farm Rd Hicksville NY 11801 balsa sizes times odd sizes further complicated lengths over four ft Perhaps lumber list dream ship runs figures wallet cannot accommodate possible solution problem could looking local lumber yard cities moderate size exists lumber yard carries balsa logs willing special order logs really logs rough sawn boards 4 4 approximately 5 average price locally such log under $5 Densities vary sometimes defect will render portion board unusable part consider able balsa good quality can obtained boards moderate price cut board usable and/or cus tom sizes first have two opposite sides trued up thickness planer Dimensional stock can now cut ordinary table saw using hollow ground blade may have cut both sides thicker pieces avoid overloading saw cut stock slightly oversize finish sanding disc table saw will get considerable balsa dust over thing operation its good cause wont run balsa suppliers out business cutting own will find awkward sizes no longer problem splicing length forgotten curse Scraps make good wing tip blocks other filler pieces dont throw away Old-Timer Event Month020 Replica If have never flown OldTimer before idea kind intrigues 020 Replica painless way try wings speak 020 Replica categorized special event Soci ety Antique Modelers offered nearly Old-Timer contest often included Old-Time event AMA contests SAM defines 020 Replica model gas model kitted plans published prior January 1943 Power restricted 020 engines no minimum weight rules fine kits available through commercial sources Old-Timer possible subject scaled down event fact some old class-A ships al ready right size about 36-in span need beefing down structurally ideal Keep structure same reduce wood sizes save weight Most old class-A ships Y8-in sq 3/16-in sq longerons 3/32-in q will suffice 020 Replica popularity event readily ap parent observing entry lists con tests offering class Some designs course competitive others models have appearing greater numbers Some contests late have dividing Old-Timer Antique categories order provide better com petitive base has move right direction Antique models would defined designed published prior De cember 31 1938 classic designs popularized during period few match later pylon ships would surprised 020 Replica continues grow see further break down between cabin pylon models 020 Replicas usually easy adjust fly require large building benches consume large amounts materials supplies conven ient transport flying field beware contagious truly great way get Old-Timer Just received word Bill Hale Con test Coordinator 10th Annual Na tional Old-Timer Championships held Dayton OH July 31 through August 2 bean fest evening fore July 30 Contact Bill 334 N Remington Rd Columbus OH 43209 enter separate events B C Cabin Pylon plus 30-second Antique 020 Replica Scale Combined Rubber 049 Old-Timer Power free fighters Radio Control events Texaco Antique Class B C Ohio just place years family vaca tion Keep sending cards letters RouteS Box 16 Coeur dAlene ID 83814 94 Model Aviation Lower timer commercial Tatone microswitch added Upper timer DT made ordinary 1-hr kitchen timer Reduces worry