OS 160 pump backplate

[Karl G. Mueller]

Eric and all,

I have had the best results on the O.S.160FX running it without
a pump or regulator. This is my setup:
Main tank 16oz. on floor in front of wing tube to get it low enough not 
to siphon. 4 oz. header (hopper) tank behind firewall.
Pipe pressure from the high point of the Pipe, where the expanding 
section ends, into the main tank. Use a fitting with a large hole in it.
The only time I have to use a starter is to start the engine the first time 
of the day. Consecutive starts are flipping prop against compression
by hand. The aircraft weights 11lbs. dry and will go vertical from take 
off without slowing down. Prop is 16.5x12 APC. Easiest setup. never 
touch the needle between flying sessions. If you have any problems 
with siphoning put a big loop in the feed line up to the very top of the 
engine compartment before you hook it up to the needle valve. Try it. 
You'll like it.


Karl G. Mueller
kgamueller at rogers.com

  ----- Original Message ----- 
  From: Grow Pattern 
  To: Discussion 
  Sent: Friday, September 30, 2005 11:36 PM
  Subject: [Bulk] Re: OS 160 pump backplate


  Before you all leap out and spend a bunch of money on an OS pump for your OS 1.60 here is what I found out while experimenting with the OS 1.60's.

  First of all, you cannot buy the pump separately. It comes installed on the 1.40 back plate.approx $150.

  Secondly, the standard OS 1.60 carb did not like the OS pump anywhere near as much as it liked the Cline regulator. (Other 1.60 users swear by the Perry). Either way the OS pump produced too much fuel for the OS 1.60 carb.

  I spent a lot of time working on the pump in the backplate with the std carb. Tried twin pug heads etc. Still could not get a good transition. If I leaned the pump for  a good transition then the engine would go lean in the verticals. I finally had enough of this and went to the OS mix carb (the one that is sadly not available). 

  You, (or at least I, could not) cannot get the std carb to work well with a pipe when the fuel is supplied from an OS 1.40 pump. I did get it to work well with a 1.40 RX carb. This carb is designed for the pump but needs to be drilled and tapped to take 3.5-mm screws to hold it in place.

  The Cline will get you much better results for around $40. (Or Perry if you prefer) and you can use your existing.

  Regards,

  Eric.




  ----- Original Message ----- 
    From: Koenig, Tom 
    To: Discussion 
    Sent: Thursday, September 29, 2005 6:28 PM
    Subject: OS 160 pump backplate


    Gentlemen

    Yes, he does make them available to those that want them. They are machined from billet stock, you will however have to supply your own pump. I think Tower has them at a reasonable price? There are no carby mods neccessary. I have mentioned this about two years ago, maybe thats where Eric got the idea? 

    If people would like one, I believe he charges about $100 AUS for them, that works out about 75 US. Not cheap-but speaking as a YS man-even I have to say his set up is sweet.

    If anyone wants his details, contact me off-line and I will provide you with his e-mail address- so you can speak to the man himself. I am actually doing a section in my column in our next APA newsletter on his set-up.

    Tom
      -----Original Message-----
      From: RUDDERCABL at aol.com [mailto:RUDDERCABL at aol.com]
      Sent: Thursday, 29 September 2005 11:52 PM
      To: Koenig, Tom
      Cc: discussion at nsrca.org
      Subject: Re: Iron Bay Regulator


      In a message dated 9/28/2005 11:36:19 PM Eastern Standard Time, Tom.Koenig at actewagl.com.au writes:
        Wayne- a pattern buddy of mine CNC's backplates for the OS 160 to suit the OS pump unit. His has run faultlessly for years ( apart from bearings ie: the usual maintenance).

        Dunno why OS themselves has not done so either.

        Tom

      Tom 

      Does he make them to sell? If so, where and how can I purchase one. Eric Henderson has that set-up and it is really sweet.

      Robert Gainey
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