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  
Enya 15 7 $40 JP14 Prop included. Turns freely and has good compression and bearings. 1 broken fin.
Fox 15 7 $30 JP11 Under the dirt is a very good Fox 15 It is matched with JP12 listed below. Turns freely and has excellent compression, and bearings.
Fox 15 7 $30 JP12 Dirty but excellent Fox 15 matcher with JP11 above. Turns freely and has excellent compression and bearings.
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
McCoy 19 9 $30 JP17 This one is so old that baffles were used instead of mufflers. It is great shape. It turns freely and has good compressionand bearings.
Magnum GP 65 9 $65 132  
Magnum Pro 40 8 $50 42  
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 FP 40 7 $45 80  
OS Max FP 40 7 $40 84  
OS Max FP 40 9 $55 79 Bench run once
OS Max FX 46 7- $65 70 Tested with 11x7 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 $110 63  
OS Max H 20 9 $50 15 Not test run because it may be new.
OS Max H 35 7- $40 JP18 dirty but has good compression and bearings and turns freely.
OS Max H 40 9 $60 JP10 Excellent shape. May be new, but has shelf dirt and has probably been test run. Turns freely with excellent compessing and bearings. Comes with the orginal box and an after market muffler.
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 Tested with a 10x6 prop and ran at 11,100 rpm and idled at 2,000. Transition, bearings, and compression good.
OS Max LA 40 6 $30 51  
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 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 runs 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 8 $60 183  
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.