RC Sport Flyer Thrust Test - O.S. GF40 Four-stroke Gasoline Engine
This video demonstrates a test run of the O.S. GF40 four-stroke gas engine, which will be featured in an upcoming issue of RC Sport Flyer Magazine. What a nice running, sweet sounding engine!

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OS 40 FP First Run

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OS Engines Four Stroke Camshaft Timing

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Bills lovely UMS 9 cyl radial 115cc

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Starting and Tuning a 4 cycle OS FS-91 Surpass

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Rare Old Engines Starting Up Sound That Will Blow Your Ears ▶19

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Testing my RARE flying military boat

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Insane Aviation & Sky Fails Caught on Camera

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How To: Basic 4 Stroke Troubleshooting

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Tiny 3.5 cc NITRO ENGINE on a BICYCLE

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Every WW2 Battle Tank Ranked — WORST to BEST

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O.S. GT33 Gasoline Engine -- PC Controlled Thrust Test

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I Make This Tiny 2-Stroke Engine From Scratch

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SAITO FG 33R3 mount WACO YMF 5C

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Rare Old Engines Starting Up Sound That Will Blow Your Ears ▶18

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Setup and test run of vintage OS Engines 15 RC glow engine.

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0-1000 mph in 22 Seconds

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OS FT 160 Gemini twin glow engine Test run after setup

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