They call Engine Exhaust Sound Frequency Divider What does make must add commercially protected individuals free cook up DID ever wish screaming 60 latest super scale model sounded like engine fullscale prototype tremendous popu larity ignition chain-saw engine model use has produced some im provement realism exhaust note bigger scale models what about convention al sized models still abound local flying field Well about try ing Engine Exhaust Sound Frequency Divider gadget originally conceived means shift sound frequency RPV engines lower range human ear less responsive mid-range frequencies proto type shown photographs rather cumbersome bench version built prove principle would feasible model airplane engines operation slotted distributor con tained within muffler gear-driven crankshaft using PIC gears directs exhaust pulses different exhaust pipes five pipes gear ratio drives distribu tor 04 revolutions per crankshaft revo Engine Exhaust Sound Frequency Divider K&B 61-powered PT-22 will have sound full-scale Kinner-engine vehicle Noise level low engine run indoors Photos John Preston Roar view left shows housing containing slotted shaft distributor direct sound five pipes Right Hefty components Identify prototype breadboard version test theory Yes worked wonder what effects various length pipes would have LA MnrIl Aviation engine sound like real airplane enginein case 5-cylinder Kinner whatever magic hearts desire U John Hunton lution exhaust directed other pipe turn Imagine will sound Kinner radial being emit ted K&B 61 other gear ratios pipe arrangements perhaps might simulate 16-cylinder Rolls Royce Merlin does Engine Exhaust Sound Frequency Divider affect fre quency engine noise also very effective muffler Coupled advantages also have engine block idle goes PA TU TA KA POP PA TU TA KA POP. Left Stock PlC gears need hardened since carry essentially no load gear ratio 104 Pipes extending like arms suggest 5barrel model might dubbed Pentapus Rear Huge throttle actuation arm rear hand-test operation running block I0
Edition: Model Aviation - 1979/05
Page Numbers: 44, 45
They call Engine Exhaust Sound Frequency Divider What does make must add commercially protected individuals free cook up DID ever wish screaming 60 latest super scale model sounded like engine fullscale prototype tremendous popu larity ignition chain-saw engine model use has produced some im provement realism exhaust note bigger scale models what about convention al sized models still abound local flying field Well about try ing Engine Exhaust Sound Frequency Divider gadget originally conceived means shift sound frequency RPV engines lower range human ear less responsive mid-range frequencies proto type shown photographs rather cumbersome bench version built prove principle would feasible model airplane engines operation slotted distributor con tained within muffler gear-driven crankshaft using PIC gears directs exhaust pulses different exhaust pipes five pipes gear ratio drives distribu tor 04 revolutions per crankshaft revo Engine Exhaust Sound Frequency Divider K&B 61-powered PT-22 will have sound full-scale Kinner-engine vehicle Noise level low engine run indoors Photos John Preston Roar view left shows housing containing slotted shaft distributor direct sound five pipes Right Hefty components Identify prototype breadboard version test theory Yes worked wonder what effects various length pipes would have LA MnrIl Aviation engine sound like real airplane enginein case 5-cylinder Kinner whatever magic hearts desire U John Hunton lution exhaust directed other pipe turn Imagine will sound Kinner radial being emit ted K&B 61 other gear ratios pipe arrangements perhaps might simulate 16-cylinder Rolls Royce Merlin does Engine Exhaust Sound Frequency Divider affect fre quency engine noise also very effective muffler Coupled advantages also have engine block idle goes PA TU TA KA POP PA TU TA KA POP. Left Stock PlC gears need hardened since carry essentially no load gear ratio 104 Pipes extending like arms suggest 5barrel model might dubbed Pentapus Rear Huge throttle actuation arm rear hand-test operation running block I0