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O.S. four-stroke engines (please state size)

Manufacturer: O.S.

Find more products by O.S.

Average Rating
No. of Reviews7
RRPN/A

Richard Allsopp 1 wrote on 08/06/2016:
48 SURPASS
Ease of assembly
0%
Build quality
0%
Flight performance
0%
Value for money
0%
Overall
0%

Kieren MacGregor wrote on 19/12/2012:
120 SURPASSIII P
Strengths: oodles of power and torque good fuel consumption
Weaknesses: Could find none
Overall: Great engine would defiantly buy another one
Ease of assembly
100%
Build quality
100%
Flight performance
100%
Value for money
80%
Overall
80%

Braddock, VC wrote on 17/06/2011:
BEST BLING, WELL MADE, THE TARGET FOR ALL OTHER 4 STROKE MAKERS
Strengths: Flawless engineering, very reliable market leader.
Weaknesses: Prone to internal rusting unless precautions taken.
Overall: I have owned 8, 3 x 26, pre surpass 40, 1 x 52, 1x 61, 1x 80 and 1 x91 surpass, I've kept the 26s, 40 and 52 for vintage models, I love em.
Ease of assembly
100%
Build quality
100%
Flight performance
100%
Value for money
100%
Overall
100%

Ian Skeldon 1 wrote on 14/06/2011:
I HAVE LOTS OF SIZES
Strengths: Used to be the engine to choose for performance at a good price.
Weaknesses: New engines very weak (thin) chrome that wears quickly. Very expensive now
Overall: I am reduced to buying only second hand ones now as the new ones are way too expensive. I now buy Lasers new instead.
Ease of assembly
80%
Build quality
60%
Flight performance
80%
Value for money
40%
Overall
60%

FlyinBrian wrote on 10/06/2011:
OS 91 SURPASS 11
Strengths: Easy to start and set up, powerful and very reliable
Weaknesses: I stripped the glow plug thread but I think this was me being a bit heavy handed
Overall: Excellent
Ease of assembly
0%
Build quality
100%
Flight performance
100%
Value for money
60%
Overall
60%

richard cohen wrote on 01/01/2011:
OS91 PUMPED
Strengths: been in use as a regular flier for 5 years or so. brilliant performer, sounds great and just had one set of bearings in all this time
Weaknesses: if run dry at the end of a session it can sometimes take a while for the pump to prime
Overall: very nice engine which starts easily once pump is primed
Ease of assembly
100%
Build quality
100%
Flight performance
100%
Value for money
100%
Overall
100%

Djay wrote on 09/02/2010:
OS 110 ALPHA, AWESOME POWER, AND SO QUITE
Strengths: lighter then pumped 91, same price same size and more power, very reliable, swings very course pitch prop for good scale flying, can swing a wide variety of prop sizes using standard - 10% fuel
Weaknesses: exhaust could be made to have an adjustable angle for ease of mounting in a scale model
Overall: forget the 91 size, this is lighter, more power and same size, also so quite in flight. very economical on fuel as well
Ease of assembly
100%
Build quality
100%
Flight performance
100%
Value for money
100%
Overall
100%

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