O.S. FS-200 Surpass w/F-6010 Sil. (L-OS35940) The largest, single-cylinder four-stroke engine that O.S. has ever made draws on unrivalled experience in engine design. This powerful, high-torque engine can turn big propellers & has been created with both scale & sports-scale modellers in mind, its compact external

Dimensions making installation within tight cowlings a real joy. Fuelling is courtesy of a specially designed twin needle carburettor &, like all the latest Surpass series, the internals have been lavished with the engineering care that only O.S. can achieve; top-grade material selection, precision machining & surface finish. Specifications: Capacity: 1.98cu.in. (32.4cc) Bore: 1.5" (38mm) Stroke: 1.13" (28.6mm) Weight: 30.1oz (853g) (w/o silencer) Power Output: 3hp @ 9, 000rpm Propeller Range: 15 x 12"
- 14", 16 x 12"
- 14", 17 x 10"
- 13", 17 x 12"
- 13", 18 x 8"
- 12" Silencer: F-6010






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O.S. FS-95V w/F-5050 Silencer L-OS30900 The first in a completely new series of four stroke engines aimed squarlely at the sport & scale modeller. Stying is deliberately retro & in keeping with the style of the very first OS four strokes. The original FS-120 had twin rocker covers & so do many full size engines in older aircraft. But retro stying does not mean retro technology! The FS-95V is a sophisticated piece of kit, delivering strong power & torque & offers a cost effective alternative to the FSa-81. The 60P carburettor is a twin needle design for great throttle response & reliable idling. There is nothing worse than having your engine cough at the wrong time when you really need a reliable response. The FS-95V will give you that pice of mind & respond just when you want it. That is why so many discerning modellers choose OS time after time! There are many models designed for. 61 2-strokes/.91 4-strokes & the FS-95V was created with that in mind. She will fit in anywhere that an FS-91S does, so model compatibility is not an issue. The added benefit, is far better silencing from the new F-5050, baffled, twin chamber silencer with an O-ring seal between the cast sections & variable length header pipe. Flexibility of silencer outlet position is well suited to scale installations & there are a variety of optional header pipes too, that will cater for just about every model.OS has always been at the forefront of safety, & continued use of a lock nut system for the propeller retention on the FS-95V is proof of this. The new V series of OS four stroke engines is here & setting the industry standards yet again. Specification Weight:592g (20.9oz) ...

O.S. FS30 Surpass w/F-1020 Silencer (L-OS33000) The smallest in the O.S. four stroke range &, at only 9.56 oz, its also the worlds lightest production model four stroke. It has most of the features of the larger single cylinder O.S. four strokes, but it has its camshaft carried in bronze bushes
- backed up by a pair of spherical thrust bearings. Ideal for trainers, scale & sport models. Designed to be used with 9” x 6~7” to 10” x 6” props. Specification: Weight: 279g Propeller Range: 9x 6-7 10x 4 Displacement: 4.89cc 0.299cu. In. Bore: 19.5mm 0.767in. Stroke: 16.4mm 0.648in Practical RPM: 2500-13000
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O.S. FS40 Surpass w/FS40S Silencer (L-OS35220) The original 6.5cc FS-40 was O.S.s second production single cylinder four stroke & the first to have the front mounted helical driven camshaft now common to all their single cylinder O.S. four stroke engines. The current FS-40S is an all-new design which is much more powerful & closely related to the FS-48, though smaller both internally & externally. Supplied complete with silencer, the FS-40S is ideal for sport & scale models & is designed for use with 10” x 7.5” to 12” x 6” propellers. Specification: Weight: 355g 12.52oz Propeller Range: 10x 7-7.5 11x 6 11x 7 12x 5-6 Displacement: 6.49cc 0.40cc. In. Bore: 21.20mm 0.835in. Stroke: 18.4mm 0.724in Power Output: 0.65PS@12000RPM Practical RPM: 2200-12000 ...

O.S. FSa-110 w/F-5040 Silencer (L-OS35410) Designed specifically to offer more power & torque compared to a. 91 size four stroke, yet still fit in the same mounting

Dimensions, the FSa-110 is a real compact powerhouse. Like all FSa series engines, the FSa-110 has near perfect carburation across the RPM range, & thanks to the carefully designed exhaust, a soft yet authoritive note to minimise your presence to the neighbours. Precision carburation, internal oil recirculation & dramatic styling are all features of the FSa range & put this & the other derivatives that cut above the opposition. Specification: Weight: 600g (672g w/silencer) Displacement: 18.0cc Bore: 30.4mm Stroke: 24.8mm Power Output: 1.8PS @ 10, 000RPMPractical RPM: 2, 000
- 11, 000


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O.S. FSa-110 w/F-5040 Silencer (L-OS35410) Designed specifically to offer more power & torque compared to a. 91 size four stroke, yet still fit in the same mounting

Dimensions, the FSa-110 is a real compact powerhouse. Like all FSa series engines, the FSa-110 has near perfect carburation across the RPM range, & thanks to the carefully designed exhaust, a soft yet authoritive note to minimise your presence to the neighbours. Precision carburation, internal oil recirculation & dramatic styling are all features of the FSa range & put this & the other derivatives that cut above the opposition. Specification: Weight: 600g (672g w/silencer) Displacement: 18.0cc Bore: 30.4mm Stroke: 24.8mm Power Output: 1.8PS @ 10, 000RPMPractical RPM: 2, 000
- 11, 000


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