[NSRCA-discussion] Break-in procedure for OS140

Sun Jun 18 12:02:55 AKDT 2006

Just did some checking - baffle is at 27inches. I ran the airplane today in 32deg C and windy conditions. The 15.5x12 4B was way too much load (at least at that pipe lenght). The plane practically stops on the top corners. I'm looking for 15x11 4B but can't find any...I don't think they are still made.

  How does the re-pitched 3 blade compare? Overall speed, upline performance and downline braking.

  Where can I get one?

  Has anyone tried re-pitching 15.5x12 4B to 15.5x10?

  Colin.

Ron Lockhart <ronlock at comcast.net> wrote:
      My Aeroslave set up on OS 140 is maybe 1/2 inch longer.
  Works nice, tachs  7,800 on ground on 15.75 x 10 3b.
  Idle setting is very lean-   I keep leaning it till it becomes hard to start, then richen a bit.

  Ron Lockhart
    ----- Original Message ----- 
  From: Wayne Galligan 
  To: NSRCA Mailing List 
  Sent: Tuesday, June 13, 2006 5:13 PM
  Subject: Re: [NSRCA-discussion] Break-in procedure for OS140

  Colin,

  What is the length of you setup from the plug to the baffle inside?  If I remember right the baflle is 15" from the inlet.

  Mine is at 26" from the plug and I finaLy was able to get a real good down line braking and richen the low end out.  The Aeroslave pipe will make a ton of power in a shorter length but the engine gets peaky and will come on the pipe or really unload.   One thing about this pipe.  If it is burbly rich in the midrange the length is too short.

  Wayne Galligan
    ----- Original Message ----- 
  From: colin chariandy 
  To: NSRCA Mailing List 
  Sent: Tuesday, June 13, 2006 11:40 AM
  Subject: Re: [NSRCA-discussion] Break-in procedure for OS140

  Worked like a charm!!

  The engine ran flawlessly on the first flight after the run-in. I'm using the Aeroslave pipe and 15.5x12 4 blade. I'm about 1 3/4 out with the high end and parallel with the cylinder for the low end screw. All seems OK.... good/slightly rich top end, reliable idle, rich in the middle but accelerates with no problem, good downline braking. When should I start moving the low end screw and where will the final position be ...typically?

  Colin.

Mike Hester <kerlock at comcast.net> wrote:
          Correction: Bottom end needle.....1/16 of a turn, not 1/8. The bottom end screw is VERY sensitive.

  -Mike
    ----- Original Message ----- 
  From: Mike Hester 
  To: NSRCA Mailing List 
  Sent: Tuesday, June 06, 2006 11:42 AM
  Subject: Re: [NSRCA-discussion] Break-in procedure for OS140

  I am going to write a full "care and feeding" article for the OS 140 for the July K-Factor, but here's a good start.

  First, set your low end screw parallel to the cylinder. 12 o'clock, straight up and down. leave it there for the duration of the break in.

  Use an APC 17x10N prop. use an OS F plug.

  back the high end needle out 2 full turns. if you plane has a chin cowl, remove it. This engine gets hot for the first run or 2 on the ground.

  Crank the engine with a very high idle. Remove the igniter and then advance the throttle to full power after about a minute. It should be spitting rich.

  Turn the high end needle until it gets some good RPM but still very rich. You should be putting out some serious smoke. let it run this way for about 5 minutes, no more.

  Shut the engine off, and let it cool for about 1/2 hour. the more, the better.

  Fill the tank, crank it again, run it to full. This time go in on the needle about 2 clicks and use that for the reference. About every 30-45 seconds, lean it until it goes to max RPM, and not ANY further. Let it run this way for about 5 seconds, and richen it back up. Cycle it this way for about 7 minutes. Shut down the engine, let it cool again.

  Crank the 3rd time, and run it at the same setting for about 2 minutes. Now lean it a couple of more clicks, and it should be still putting out some serious smoke, but a little closer to full. Step back, and let it run wide open for a minute, then begin throttling it back and forth every minute or so. Run the tank out like this.

  put it together and go fly it. Don't touch the needle. When you get to the bottom of the 1st gallon, go in with the needle ONE click every flight until you get max power. When your low end changes, set the low end (always more lean, but not a whole lot. When you play with that bottom end, a little goes a long way. Like 1/8 of a turn or so.

  There are a lot of diffferent ways to do it; some people just set it rich and fly. This way works every time though, and the engines last longer.

  have fun,
  -Mike
    ----- Original Message ----- 
  From: colin chariandy 
  To: NSRCA Mailing List 
  Sent: Tuesday, June 06, 2006 10:55 AM
  Subject: [NSRCA-discussion] Break-in procedure for OS140

  Just got a new OS140. I have'nt broken in one for 5 years...what's the best/current practice for break-in?

  Colin.
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