OS FS-20
#1
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OS FS-20
Yes, I know it is out of production.
But I got a used one, adjusted the valves, and tested it.
Master Airscrew 9x6 Classic, Powermaster YS 20/20, OS "F" glow plug. 85°F OAT.
10,800 RPM peak.
http://media.putfile.com/OS-Engines-FS-20-Four-Stroke
But I got a used one, adjusted the valves, and tested it.
Master Airscrew 9x6 Classic, Powermaster YS 20/20, OS "F" glow plug. 85°F OAT.
10,800 RPM peak.
http://media.putfile.com/OS-Engines-FS-20-Four-Stroke
#2
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RE: OS FS-20
This is a very timely post. I recently obtained a used OS FS-20 and plan to run it for the 1st time next week. Will be using home brew fuel - 10% nitro, 20% oil (castor/synthetic) and a standard MA 9 x 6 prop.
Mine has the incredibly tiny but cute muffler. Will post RPM results when complete [8D]
Mine has the incredibly tiny but cute muffler. Will post RPM results when complete [8D]
#5
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RE: OS FS-20
Okee dokee - ran the little beastie at the field today. Home brew fuel mixed this morning being 70% methanol, 10% nitro, 15% red Klotz & 5% castor oil (Castrol M). Brand new OS "F" plug, air temp approx 75F & dry.
The RPM Results:
Zingali 9 x 6 = 10,300 (NB: not leaned out as engine was VERY UNHAPPY with this fibreglass (?) prop, made dreadful mechanical noises - perhaps resonance thru the prop [:'(])
MA 9 x 5 = 11,400
MA 10 x 4 = 11,100
Bolly 10.5 x 5 = 9,000
MA 10 x 6 = 8,400
APC 10 x 6 = 8,500 (NB: used the APC prop simply to annoy FBD )
MA 11 x 6 = 7,400
Will post a pic of the tiny muffler later [8D]
The RPM Results:
Zingali 9 x 6 = 10,300 (NB: not leaned out as engine was VERY UNHAPPY with this fibreglass (?) prop, made dreadful mechanical noises - perhaps resonance thru the prop [:'(])
MA 9 x 5 = 11,400
MA 10 x 4 = 11,100
Bolly 10.5 x 5 = 9,000
MA 10 x 6 = 8,400
APC 10 x 6 = 8,500 (NB: used the APC prop simply to annoy FBD )
MA 11 x 6 = 7,400
Will post a pic of the tiny muffler later [8D]
#7
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RE: OS FS-20
Here is the pic of the OS 20FS muffler that came with my engine......as you can see, it's very tiny - 30 mm long & only 13 mm at its widest point. Placed alongside a AA battery for size reference