OS 1.60 Issues

[Karl G. Mueller]

Re O.S. 160FX issues.

Engines with remote needle valves don't like to run with pumps or regulators very well. I went through all of these setups and none were satisfactory.
This is the least troublesome setup. No pump or regulator or check valve.
I have my two engines running and pulling better than a DZ.
The speed is actually too fast and I have to try to load them up with more prop.
At the moment I am using a 16.5 x 12 APC.  A heavier prop might change the 
pipe length a little. 
I'm using a 3" header extension between my header, which meassures
about 6" straight back from the glow plug, to a Mac's 15cc quiet pipe. 
I also did some mod's on the exhaust timing to allow for running on the
pipe. A 4oz header (or hopper ) tank behind the firewall, which I use on all 
setups now, and the main tank just in front of the wing tube. Had to move it down
on the floor of the fuselage because of siphoning. Pressure line from the high
point of the pipe into the main tank. Good idle and midrange as well as transition
to high speed.  Actually too much power.
But than again too much is just enough!!!

Karl G. Mueller
kgamueller at rogers.com


  ----- Original Message ----- 
  From: JonLowe at aol.com 
  To: discussion at nsrca.org 
  Sent: Tuesday, June 01, 2004 8:09 AM
  Subject: OS 1.60 Issues


  I have a Titan, OS 1.60, Mueller header, Greve pipe, Ironbay regulator before the needle valve, OS #8 plug, running a 17x13 with 15%.   Tank is monted over the CG.  Hyde mount.  As near as I can measure around the header, I am at the length that Piedmont recommends for these pipes on their site.  Good power at full throttle, but midrange stinks, wanting to load up at 3/4 throttle, and not transition to full throttle.  Also, the mixture changes in the air, upright to inverted, going rich inverted.  I have the regulator mounted horizontally about 1.5 inches from the needle, do I need to mount it fore-aft like a Cline?  Do you think I need to extend the length of the pipe?  Any carb adjustment tricks?  I'm new to pipes, so any info will help.

  BTW, the original  pressure check valve went bad before I even got to fly it.  I got a check valve (Foremost) from my local hobby shop that seems to work, developing pressure and holding it well.  Have others had problems with the Ironbay valves?

  Thanks.

  Jon Lowe
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