Braddock, VC Posted March 10, 2019 Share Posted March 10, 2019 This seems to be a common theme on many websites, I tried to be disciplined and finally came down to an OS 91 Fx. My 91 has been in very many airplanes from a kit built acrowot with a 14x7 3 bladed graupner up to an Xtrawot with a 14x6 apc and with two dragon ladies, two WM midget mustangs, one BH midget mustang and a Goldberg ultimate in between. There may be a couple of others but I can't remember what they were but basically anything 60 sized. I used to swap engines quite a bit and the 91Fx shares the same mounting footprint as the O 91 FS, saito 125 FS, Yamada 110/115 FZ and not forgetting my OS 61 FX. It's been the most reliable engine I've ever had and I can't remember the last time I changed a plug. Most of its time with me it's been fed 10% liquid gold but recently I've upped to 15% liquid gold and it still hand starts easily. Quote Link to comment Share on other sites More sharing options...
Braddock, VC Posted March 10, 2019 Author Share Posted March 10, 2019 The two I forgot were a hangar 9 pulse 60 and a kyosho Calmato 60 low wing. Duties were shared with both SC61 and 91 two strokes. Suffice to say I've swapped or sold all the engines mentioned except the 91Fx and the 61Fx. Edited By Braddock, VC on 10/03/2019 13:34:16 Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted March 10, 2019 Share Posted March 10, 2019 Good choice, I felt the same about mine, O.S 32 SX ran it close, Winner would be O.S 120 pumped, no faffing where tank goes, sounds/runs beautiful and a thing of beauty. Quote Link to comment Share on other sites More sharing options...
Former Member Posted March 10, 2019 Share Posted March 10, 2019 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted March 10, 2019 Share Posted March 10, 2019 OS 40 Surpass. A close second would be the SC 32. Quote Link to comment Share on other sites More sharing options...
Rich too Posted March 10, 2019 Share Posted March 10, 2019 I have modest experience compared to most on here but would have to be my DA70. Quote Link to comment Share on other sites More sharing options...
Don Fry Posted March 10, 2019 Share Posted March 10, 2019 I've always liked my old Laser 75. Tough, reliable, had it many years, done a lot of hours, and still plods on. Wish it was pumped though. Quote Link to comment Share on other sites More sharing options...
cymaz Posted March 10, 2019 Share Posted March 10, 2019 Kolm 4 stroke petrol, if only for the sound and money no object Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted March 10, 2019 Share Posted March 10, 2019 I've thought about this long and hard and I can only say that I'd do everything within my power not to have only one engine. Quote Link to comment Share on other sites More sharing options...
ken anderson. Posted March 10, 2019 Share Posted March 10, 2019 any of the OS engines...…..forever and a day...but now electric is my chosen power plant. ken anderson...ne...1.engine dept. Quote Link to comment Share on other sites More sharing options...
Paul Marsh Posted March 10, 2019 Share Posted March 10, 2019 OS 120FS Pump. Have quite a few of them and powerfull sound nice and keep going. One has been in 2 arframes and had 100's of flights, and replaced the bearings a few years ago. Edited By Paul Marsh on 10/03/2019 14:39:56 Quote Link to comment Share on other sites More sharing options...
J D 8 Posted March 10, 2019 Share Posted March 10, 2019 Irvine 46, been in my go to hack for some twenty years and still going strong. Quote Link to comment Share on other sites More sharing options...
Brian Hammond Posted March 10, 2019 Share Posted March 10, 2019 Same as Percy but the two best engines were a n Oliver Tiger in the 1950s and later on an OS 70 Surpass. Quote Link to comment Share on other sites More sharing options...
Chris Channon Posted March 10, 2019 Share Posted March 10, 2019 Saito .40 brilliant little engine. Regards Chris.C. Quote Link to comment Share on other sites More sharing options...
Paul Marsh Posted March 10, 2019 Share Posted March 10, 2019 MDS 40? .... Quote Link to comment Share on other sites More sharing options...
Braddock, VC Posted March 10, 2019 Author Share Posted March 10, 2019 Posted by J D 8 on 10/03/2019 15:00:47: Irvine 46, been in my go to hack for some twenty years and still going strong. I like the old jupiter, I've got a part kit of it in my loft, missing the fittings regrettably but I'll get them some day. Quote Link to comment Share on other sites More sharing options...
Former Member Posted March 10, 2019 Share Posted March 10, 2019 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Don Fry Posted March 10, 2019 Share Posted March 10, 2019 Yea, I bought a new Laser 80 last year. Astonishing difference in power. Still wish it had a pump. Quote Link to comment Share on other sites More sharing options...
michael kuss Posted March 10, 2019 Share Posted March 10, 2019 Saito 82 for a 4st and a supertigre 34 for a 2st . Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted March 10, 2019 Share Posted March 10, 2019 Not so long ago it would have been my old Enya 60-IIIBB, more recently I used nearly all 4 strokes so I guess I'd plump for the Laser 80, though the OS91 Surpass-II would run it close. Nowadays it would have to be an SK3 5055 430kv. Edited By Bob Cotsford on 10/03/2019 16:17:53 Quote Link to comment Share on other sites More sharing options...
Stearman65 Posted March 10, 2019 Share Posted March 10, 2019 OS40 FS, had about 4 in my IC modelling years. Quote Link to comment Share on other sites More sharing options...
Wingman Posted March 10, 2019 Share Posted March 10, 2019 My Saito FG33R3 - lovely to look at and I could listen to its tick-over all day! Quote Link to comment Share on other sites More sharing options...
John Duncker Posted March 10, 2019 Share Posted March 10, 2019 MDS 38 It was bought to power a Limbo dancer it's brothers powered a couple of helis. The Limbo Dancer spent a lot of time pretending to be a heli. The original towed Ripmax Trainer round the skies for years. It then was the only engine I held on to when Isold up on retirement and moved into an RV for a couple of years when we explored North America. I have no idea how many gallons of 5 % it consumed but it was a lot. Utterly reliable, almost always a first flick start and no messing around with the needle just two clicks richer in winter.After 12 years I sold it still on the original bearings. Quote Link to comment Share on other sites More sharing options...
Peter Jenkins Posted March 10, 2019 Share Posted March 10, 2019 Irvine 53 Mk 2. Powerful, easy to start and goes on for ever! Wish they were still making them but I guess it took too much business away from the OS55. Second choice would be DLE 35RA. My second petrol engine and with a JMB can quieter than many 60 size glows. Easy to start, economical and powerful. Quote Link to comment Share on other sites More sharing options...
Robert Putley 1 Posted March 10, 2019 Share Posted March 10, 2019 Laser 80. Beautiful motor.. 1st flick starts, runs beautifully, and so quiet. And looks gorgeous. As a fellow club member remarked, a beautiful motor. Quote Link to comment Share on other sites More sharing options...
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