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
CS 46 10 $50 4  
Enya 25 10 $50 9  
Enya 29 10 $50 8  
Enya 29 3 $15 6  
Evolution 46 8 $55 97  
Evolution NT 61 10 $90 99  
Evolution NT 61 10 $90 90  
Evolution NT 61 10 $90 98  
HB 25 8 $40 1  
HB 61 10 $85 13  
Irvine 40 6 $40 68 Idles at 2,300 rpm, otherwise great
K & B 61 7 $40 59 Muffler is patched, but engine is great!
Magnum GP 65 9 $70 132 Engine bench run once.
Magnum XL 25 7 $40 49 One of a pair used on a P61. Carefully broken in and flown 8 times. Plane wrecked without effecting the engines.
Magnum XL 25 7 $40 48 One of a pair used on a P61. Carefully broken in and flown 8 times. Plane wrecked withuut effecting the engines.
MAGNUM XL 28 9 $50 41 Mounted but never run
Magnum XL 46 6 $35 69 Idles at 2,400 otherwise great
Magnum XL 46 7 $50 47  
Magnum XL 46 10 $65 50  
Magnum XL 52 10 $75 85  
Magnum XL 53 6 $50 95  
Magnum XL 61 9 $65 93 Evolution muffler and OS carb. runs exceptionally well
Magnum XL 61 10 $80 94  
MDS 40 5 $30 jp5  
OS Max AX 46 7 $80 62  
OS Max AX 46 8 $90 60 FX muffler
OS Max AX 75 8 $140 52  
OS Max FP 35 7 $40 89  
OS Mas FP 40 7 $40 91 Rear mounted needle
OS Max FP 40 5 $35 80 Idles at 2,500, should be 2,200
OS MAX FP 60 7 $65 82 Semico strap on muffler
OS Max FP 60 7 $65 81 Small chip out of the top of carb throat
OS Max FX 61 7 $100 53 Runs like a fine machine.
OS Max FX 61 7 $105 58  
OS Max FX 91 7 $130 63  
OS Max FX 91 7 $125 67  
OS Max LA 25 8 $45 56  
OS Max LA 40 7 $45 55  
OS Max LA 65 6 $65 71 Chipped fin reduced it to a 6 rating
OS Max SF 46 7 $55 65  
OS Max SF 61 7 $100 64 Ringed version
OS Max SR 40 7 $50 61 New Ring
OS Max SR 45 6 $45 66 Case retapped to secure muffler.
OS Max SR 60 7 $110 54 My best 60 engine new or used!
RJL 61 7 $95 70  
SK 50 7 $50 7  
Super Tiger 40 4 $35 189 Roars at top speed, but idles poorly
Super Tiger 45 7 $60 195 Made in Italy
Super Tiger 45 9 $75 191 New bearings
Thunder Tiger Pro 46 10 $85 73 Priced down to 9 because of light shelf patina
Thunder Tiger Pro 61 7 $75 142  
Thunder Tiger Pro 61 8 $85 140  
Thunder Tiger Pro 61 9 $90 72  
Webra 40 7 $50 75 performs like an #8, but used more than an #8. Semico strap-on muffler
Webra Speed 61 7 $65 79  
Webra 61 7 $60 78