The new FSa-81 is a direct replacement for the FS-70 Surpass II, offering greater power and throttle precision in a compact and lightweight design. The crankcase mounting dimensions allow the FSa-81 to slot into the same mount that an FS -70S II would for an instant power upgrade.
Like the FSa-56, the crankcase breather system has now been incorporated inside the engine to negate the need for an external vent and the excess oil that eminates from it. A propeller locknut assembly is of course standard.
The new F-5030 silencer is very effective, thanks to it's internal baffle and carefully matched internal volumes and opassages. The design allows a huge range of outlet positions to accomodate almost every model. Even the distance away from the engine can now be adjusted.
The latest 60RA carburettor now features a 'constant velocity' inlet for improved throttle response and reduced spitting.
Specification |
Propeller Range: |
13x7-9, 14x6-7 |
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Displacement: |
13.26cc 0.809 cu.in. |
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Power Output: |
1.3PS @ 11,000 |
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Practical RPM: |
2,200 12,000 |
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- Brand: OS Engines
- Part No: L-OS34810
- Barcode: 4531028018662
- Format: Nitro 4 Stroke
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