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OS 160 FX

Old 03-15-2010, 09:05 PM
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1/4 Scale
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Default OS 160 FX

I currently put an OS 160 FX in a CMP PT-40 Warhawk with a 16x10 Master Airscrew wood prop. Instructions say 1,800-10,000 operating range. I am currently getting 9,400 rpm and thought that was perfect. I realize in the air it will be much higher. Should I go to an 18x10 and does anyone know how many rpm it will drop.
Old 03-15-2010, 09:23 PM
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Default RE: OS 160 FX

18x10, and 18.1x10 APC are common props on the 160 in pattern world. Don't know the numbers off the top of my head but people seem to like the combination of speed and breaking.
Old 03-16-2010, 02:25 AM
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Default RE: OS 160 FX


ORIGINAL: 1/4 Scale

I currently put an OS 160 FX in a CMP PT-40 Warhawk with a 16x10 Master Airscrew wood prop. Instructions say 1,800-10,000 operating range. I am currently getting 9,400 rpm and thought that was perfect. I realize in the air it will be much higher. Should I go to an 18x10 and does anyone know how many rpm it will drop.


G'day Mate,
I found that judicious throttle control will stop the engine over revving with a 16x10 APC, or try a 17x10 APC, the 16x10 will give more pulling power for uplines, as it won't slow down as quickly as a 17x10.
Try em & decide for yourself.
Old 03-16-2010, 02:34 AM
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Default RE: OS 160 FX


ORIGINAL: gaRCfield

18x10, and 18.1x10 APC are common props on the 160 in pattern world. Don't know the numbers off the top of my head but people seem to like the combination of speed and breaking.
Joe,
That's on pipe. A warbird would look silly with a tuned pipe but maybe he has one on it. On regular muffler, he's better off with the 16x12, 17x10 or there abouts. On muffler, the 18.1x10 will drop him to around mid 7s or lower. 18x6 or 8 is probably better choice. Should turn those around 7.8k to 8k on 15% nitro

MattK
Old 03-16-2010, 01:08 PM
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jaka
 
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Default RE: OS 160 FX

Hi!
Try 18x6! The MA (white tipped) prop is the worst you can use.
Old 03-21-2010, 08:18 PM
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Default RE: OS 160 FX

Thanks for all the info.
Old 03-22-2010, 06:08 AM
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Default RE: OS 160 FX

I don't know anyone that can read RPM in flight....if you're in the RPM range I say you're good to go.....Good flyin
Old 03-22-2010, 11:03 PM
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Default RE: OS 160 FX

I run the 18.1x10 APC on my KMP Sea Fury. I have never tached the motor, but it pulls the 18 pound plane like a rocket. 120+mph in level flight easily. Had it at Joe Nall and none of the 50cc warbirds could keep up!
Old 03-23-2010, 01:24 AM
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Default RE: OS 160 FX

Wow. If that is 18 lbs I might need to fly half throttle for a while. This plane is designed for a 1.20 size max. I'm guessing it only weighs around 10-12 lbs. At full throttle itmight come apart.
Old 03-23-2010, 12:31 PM
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Default RE: OS 160 FX

At your lightish weight with that much pitch, you MIGHT have a hard time slowing that warbird down for landings. I like my 18x6w and 160FX combo on my Giles, and with a 16x10 I could not get it to slow down enough for good landings. Just my 2 cents worth! Jon
Old 03-23-2010, 12:36 PM
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Default RE: OS 160 FX

Yeah my Sea Fury takes some time to slow down, but it also has huge split flaps that I get as close to 90 degrees as possible. I wanted the completely unexpected absurd top end, so I was willing to sacrifice the ability to slow down. However, the 1.60 idles so low, it does land relatively normal for a heavy warbird.

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