YS 1.40 Vs OS 1.60 Who got Power
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RE: YS 1.40 Vs OS 1.60 Who got Power
ORIGINAL: seanychen
About the OMP MCP, maybe they mean 1000 rpm gain from stock muffler, which may be weaker than BCM Pitts. That stock muffler is next to useless: heavy (10 oz, 1/3 of engine weight, structurally unsound, and now power robbing? The only virtue of that muffler is perhaps providing back pressure and muffles.)
About the OMP MCP, maybe they mean 1000 rpm gain from stock muffler, which may be weaker than BCM Pitts. That stock muffler is next to useless: heavy (10 oz, 1/3 of engine weight, structurally unsound, and now power robbing? The only virtue of that muffler is perhaps providing back pressure and muffles.)
I will answer my own questions here as now I have the answers and others in the market I am sure would like to know.
Header length is 10" - Macs standard header. Total length from beginning of header to end of stinger is about 32"
No it will not fit in pipe channel. It is about 4" to long, but is not to bad hanging out.
The + 1000 RPM is with 18 x6apc prop--This sounded like a lot to me and on my recent bench test the pipe yielded this for me:
I had a chance to get out and get some test stand #'s on the OMP pipe today. OS160FX , VP30 Perry Pump & CP10%/Omega 5% 70/30 blend fuel. Thank you aerobob for a properly broke in 160FX—it is turning the XXXX out of the 18x6W!
With Bison pits & APC 18 x6w 8940 peak wav file -- bad sound quality http://home.comcast.net/~ccrsfield/18_6W_bis2.wav Spool was fine for 3D
With Bison pitts & SKorepa 8800 not peak - very fast spool http://home.comcast.net/~ccrsfield/18_6SK_bis.wav
With OMP pipe & APC 18 x6w 9080 peak fast spool, very loud down low! http://home.comcast.net/~ccrsfield/18_6W_pipe2.wav
Open face & -----APC 18 x6w 9200 peak Good spool http://home.comcast.net/~ccrsfield/18_6W_open.wav Motor ran good with no backpressure
The pipe was very loud at low rpm. At low rpm it had a rap sound that does not come across in the sound file very well. I think that in IMAC it would earn a big fat 0 on sound and they would ask me to change my pipe. Also, I don’t think my club would be happy with me running this pipe. If they did a sound check there is no way it would pass at idle. It did not seem to get any louder with increased RPM.
Performance increase over Bison muffler with 18X6W prop was a dismal 140 RPM. There was no tuned effect as the open face reading was almost 100 rpm more. Spool did improve from the Bisson muffler with the 18x6W, so I think the pipe is long and would benefit from a shortened header or heaver load prop.
http://www.rcuniverse.com/forum/m_30...tm.htm#3541924 post#807
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RE: YS 1.40 Vs OS 1.60 Who got Power
OS 160 makes more power than the ys 140,
But YS 140 would be better overall engine because of wider power band and it is naturally pumped...Many people like having the fuel tank at the CG so that is a nice bonus...By the time you buy a muffler and a pump for the OS 160 its cost is about the same as a ys140
But YS 140 would be better overall engine because of wider power band and it is naturally pumped...Many people like having the fuel tank at the CG so that is a nice bonus...By the time you buy a muffler and a pump for the OS 160 its cost is about the same as a ys140
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RE: YS 1.40 Vs OS 1.60 Who got Power
ORIGINAL: DiscoWings
OS 160 makes more power than the ys 140,
But YS 140 would be better overall engine because of wider power band and it is naturally pumped...Many people like having the fuel tank at the CG so that is a nice bonus...By the time you buy a muffler and a pump for the OS 160 its cost is about the same as a ys140
OS 160 makes more power than the ys 140,
But YS 140 would be better overall engine because of wider power band and it is naturally pumped...Many people like having the fuel tank at the CG so that is a nice bonus...By the time you buy a muffler and a pump for the OS 160 its cost is about the same as a ys140
There is nothing narrow about the power band of the OS160--with the right prop spool is instantaneous(Skorepa 18x6). It does need a pump and proper adjustment to get it metering decent thru the entire range of the motor & fast spool.
You might find this interesting....
OS 1.60 v.s. YS 1.40 DZ Cost Analysis -
http://www.rcaerobats.net/MotorCostComparison.htm
Notice the fuel usage between the two motors on the same pattern plane flying the same sequence? The OS is much less to operate.
I like YS's though...just cost a lot more to run one. And not worth it to me.
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RE: YS 1.40 Vs OS 1.60 Who got Power
Got a chance to get out and try my new macs clone pipe. It is very quiet--prop is louder than pipe. Seems to work good. I don't have the right prop for it yet (19x7 Skorepa) so I tested it with the APC18x6w. Pipe is 5.75oz and feels very substantial. Should work O.K. Tuned length should be for the low 8's and it was turning the 18x6w a little over 9. I
See 2 mb film clip:
http://home.comcast.net/~ccrsfield/OS16_Pipe.wmv
See 2 mb film clip:
http://home.comcast.net/~ccrsfield/OS16_Pipe.wmv
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RE: YS 1.40 Vs OS 1.60 Who got Power
I have the motor on the plane. Still am waiting for the right prop, but did a thrust test with the 18x6w. It was spinning in the low 9's(coming off the pipe need to load motor in the mid 8's) and pulled almost 19 pounds of thrust.
See video of run up with thrust test.
http://home.comcast.net/~ccrsfield/giles2.wmv
See video of run up with thrust test.
http://home.comcast.net/~ccrsfield/giles2.wmv