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If you only had one engine to use, which one would it be.

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Braddock, VC10/03/2019 13:29:19
1645 forum posts
82 photos

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.

Braddock, VC10/03/2019 13:33:35
1645 forum posts
82 photos

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

john stones 110/03/2019 13:39:33
11102 forum posts
1498 photos

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.

Percy Verance10/03/2019 13:41:47
8108 forum posts
155 photos

I don't do engines anymore, but a couple I've had have stood out over the years.

1. MVVS .28 superb performance in a small package. Easily as good as an OS.

2. OS .48 Surpass solid and reliable. Probably the best small four stroke OS have ever made.

Peter Miller10/03/2019 13:49:24
10717 forum posts
1254 photos
10 articles

OS 40 Surpass. A close second would be the SC 32.

Rich too10/03/2019 14:03:43
3057 forum posts
1070 photos

I have modest experience compared to most on here but would have to be my DA70.

Don Fry10/03/2019 14:09:39
4557 forum posts
54 photos

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.

cymaz10/03/2019 14:15:46
9003 forum posts
1187 photos

Kolm 4 stroke petrol, if only for the sound and money no object

Martin Harris10/03/2019 14:18:08
9154 forum posts
229 photos

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.

ken anderson.10/03/2019 14:20:51
8543 forum posts
776 photos

any of the OS engines...…..forever and a day...but now electric is my chosen power plant.

ken dept.

Paul Marsh10/03/2019 14:33:49
3832 forum posts
1110 photos

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

J D 810/03/2019 15:00:47
1384 forum posts
79 photos

Irvine 46, been in my go to hack for some twenty years and still going strong.Irvine 46

Brian Hammond10/03/2019 15:10:19
337 forum posts

Same as Percy but the two best engines were a n Oliver Tiger in the 1950s and later on an OS 70 Surpass.

Chris Channon10/03/2019 15:25:23
546 forum posts

Saito .40 brilliant little engine.



Paul Marsh10/03/2019 15:37:49
3832 forum posts
1110 photos

MDS 40? ....devil


Braddock, VC10/03/2019 15:40:12
1645 forum posts
82 photos
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.Irvine 46

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.

Andrew Ray10/03/2019 15:41:21
755 forum posts
19 photos

Like Don, my old Laser 75 has given years of service, easy to start, economical, reliable and just keeps going on and on. Although today if I was limited to one engine it would have to be one of my Laser 80s, same size as the 75 but more power.

Edited By Andrew Ray on 10/03/2019 15:42:17

Don Fry10/03/2019 15:58:27
4557 forum posts
54 photos

Yea, I bought a new Laser 80 last year. Astonishing difference in power. Still wish it had a pump.

michael kuss10/03/2019 16:11:00
12 forum posts

Saito 82 for a 4st and a supertigre 34 for a 2st .

Bob Cotsford10/03/2019 16:17:21
8230 forum posts
454 photos

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

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