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

Brand: O.S.

Overall:
3
Ease of assembly:
3
Build quality:
4
Flight performance:
4
Value for money:
3

READER REVIEWS
Richard Allsopp 1  |  Jun 08, 2016

Strengths:
. . . .
Weaknesses:
. . . .
Overall:
. . . .

Overall:
0
Ease of assembly:
0
Build quality:
0
Flight performance:
0
Value for money:
0
Kieren MacGregor  |  Dec 19, 2012

Strengths:
oodles of power and torque good fuel consumption. . . .
Weaknesses:
Could find none. . . .
Overall:
Great engine would defiantly buy another one. . . .

Overall:
4
Ease of assembly:
5
Build quality:
5
Flight performance:
5
Value for money:
4
Braddock, VC  |  Jun 17, 2011

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. . . .

Overall:
5
Ease of assembly:
5
Build quality:
5
Flight performance:
5
Value for money:
5
Ian Skeldon 1  |  Jun 14, 2011

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. . .

Overall:
3
Ease of assembly:
4
Build quality:
3
Flight performance:
4
Value for money:
2
FlyinBrian  |  Jun 10, 2011

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. . . .

Overall:
3
Ease of assembly:
0
Build quality:
5
Flight performance:
5
Value for money:
3
richard cohen  |  Jan 01, 2011

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. . . .

Overall:
5
Ease of assembly:
5
Build quality:
5
Flight performance:
5
Value for money:
5
Djay  |  Feb 09, 2010

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. . .

Overall:
5
Ease of assembly:
5
Build quality:
5
Flight performance:
5
Value for money:
5
X