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






...

O.S. FS-62V w/F-4050 Silencer (L-OS30600) The second engine in the new V series of O.S. four strokes is targeted at both sports & scale modellers alike. Like the FS-95V, the FS-62V has the same classic overall design that appeals to scale modellers that like their engines to remain in character with the model. The performance, on the other h&, is very much 21st Century & builds on the O.S. tradition of constant technological advancement with each new range. In the case of the V series, there is also a strong emphasis on value for your money. The carburettor remains as the twin-needle type for both power & throttle response & the Jet Stream generation silencer allows both flexibility of orientation as well as effective sound reduction. By sharing the same mounting bolt pattern as the FS-52 Surpass & FSa-56, mounting the FS-62V as a direct replacement is easy & convenient. The angled pushrod & valve layout allows a better shape of combustion chamber, providing better power & efficiency. The cylinder head is also made from a special alloy that is different to the crankcase to balance durability against reduced weight. Only O.S. goes into this kind of original design detail, separating O.S. quality & performance from those that just copy! Specification: Weight: 442g (15.59oz)s w/o Silencer Weight: 486g (17.14ozs) w/ Silencer Propeller Range: 12 x 6, 12 x 7, 13 x 6, 13 x 7, 14 x 6 Displacement: 10.11cc (0.617cu.in) Bore: 25.0mm (0.984in) Stroke: 20.6mm (0.81in) Power Output: 1.1PS @ 10000rpm Practical RPM: 2400
- 11000rpm
...

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. 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


...

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


...

O.S. FSa-56 w/F-4040 Silencer (L-OS34300) The new FSa-56 from O.S. is the first engine in a completely new series of advanced four-strokes. The FS ‘ Alpha’ series draws on the experience gained from the Surpass range to develop & refine standards to a new level. The increased capacity compared to the FS-52 Surpass means more power/torque & the new carburettor provides even better throttle control across the entire RPM range! There are innovative features like incorporating the crankcase breather/oil recirculation system into the crankcase to dispense with external nipples & drain tubes as well as a dramatic & futuristic style. An effective & versatile silencer is supplied as standard. Specification Weight:419g/14.8oz w/o silencer Capacity:9.32cc / 0.569 cu.in. Propeller Range:13x 6-7 12x 6-8 13x 6 Silencer:F-4040 Bore:24.0mm / 0.945in Stroke:20.6mm / 0.811in Power Output:1.0PS @ 10, 000 RPM ...

O.S. FSa-72 w/F-5030 Silencer (L-OS34720) Sharing the same mounting

Dimensions as the old FL-70 & FS-70U, the new

...