OS 61 SF Engine Featured Engine: OS 61 SF

I have had people tell me that the future of power for RC airplanes lies with electric motors or gasoline engines. But I find that two stroke nitro engines are still a very effecient, reliable, and inexpensive way to fly medium sized planes. A sport flyer would be remiss not to consider two stroke nitro engines for power. Listed here are a number of preowned new and used options that might interest you.

BRAND SIZE RATING PRICE SKU DESCRIPTION
Evolution NT 61 10 $90 90  
FOX 45 7 $50 56  
Fuji 40 8 $60 31 May be a 9
Irvine 46 7- $60 14 very small leak at needle, otherwise great
Irvine 61 6+ $50 13 Runs well for an older used engine.
Magnum GP 65 9 $65 132  
Magnum Pro 40 8 $50 42  
Magnum XL 46 5 $35 91 Looks ugly. Tested woith 12x5 prop (11x5 would be better fit). Ran at 10,200rpm and idled at 2,800. Transition, bearings and compression good. IDle is the problem.
Magnum XL 61 7 $60 96  
Magnum XL 61 10 $80 95  
Magnum XL 61 7 $55 97  
OS Max AX 46 7 $75 68  
OS Max AX 55 7 $95 89 Tested with a12x5 porp. Ran at 10,540 and idled at 2,100. New bearings. compression, and transition good.
OS MAX FP 40 7 $45 80  
OS Max FP 40 7 $40 84  
OS Max FX 46 7- $65 70 Tested with 11xx7 prop (11x5 better fit.) Ran at 11,070 and idled at 1,800. Transitin, comprssion and bearings good. Bit dirty, but runs well.
OS Max FX 46 7 $70 75  
OS Max FX 46 7 $75 73  
OS Max FX 61 7 $90 53 Runs like a fine machine.
OS Max FX 61 7 $90 58  
OS Max FX 61 7 $90 35  
OS Max FX 91 7 $120 63  
OS Max H 20 9 $50 15 Not test run because it may be new.
OS MAX H 40 6 $40 50 Idles at 2,300, otherwise is impressive.
OS Max LA 40 7 $40 55  
OS Max LA 40 7 $45 30  
OS Max LA 40 6 $30 51  
OS Max LA 65 8 $75 82  
OS Max SF 40 7+ $65 71 Tested with 11x6 prop. Ran at 11,600 rpm and idled at 1,950. Transition, bearings, and compression excellent. Strong solid engine.
OS Max SF 46 10 $95 59 Ringed
OS Max SF 61 7- $85 52 Tested with 12x6 prop. Ran at 12,040 and idled at 1,860. Transition, bearings and compression excellent. Clunky after market muffler.
OS Max SF 61 8 $110 57 Ringed
OS Max SR 60 6 $90 60 Still run great!
OS Max SR 60 7 $110 54 My best 60 engine new or used!
OS Max SR 60 7 $120 48 Or, this might be my best 60 engine!
OS Max SR 60 7+ $125 64 This one is also my best 60 engine! Tested aith 11x7.5 prop. Ran at 12,040 rpm and idled at 2,000. Compression, bearings, tand transition good.
Super Tiger 40 7 $50 187 Italian made
Super Tiger 40 7 $50 186 Made in Italy. Looks lightly used. Starts immediately. Transition, compression, bearings, high speed and idle excellent. Very responsive.
Super Tiger 45 6 $50 183 chiped outer corner and repaired muffler mount
Super Tiger 45 8 $60 185  
Super Tiger 61 6 $60 197 0lder round head style. Tested with 12x8 prop (a better fit would be 11x7) Ran at 10,400 rpm and idled at 2,400. Rpm numbers will be better with the smaller prop. Compression, bearings, ansition good.
Super Tiger 61 7 $75 182  
Super Tiger 61 7 $75 188  
Super Tiger 75 8- $90 87  
Super Tiger 90 6+ $90 62 Runs impressively. Older round head style, made in Italy.