[NSRCA-discussion] APC 18.1 x 10W props

[Mike Hester]

That's true, it's just a feel thing. I agree with Mike's assessment.

I'm using the 18.1x10 regular and Jim Ivey is using the 18.1x10w clipped. They both work really well. Mine tachs right around 8100, Jim's is really close to that number as well.

The differences in the 2 as I can see, just an impression: The 18.1x10 that I'm using has a really wide speed envelope. Good slow down lines but it will turn into a rocket at full power. It does load the engine down a bit, but I'm running it a little rich.

The 18.1x10W clipped that Jim is using has really good down lines, good top end, but at cruise speed it's turning more RPMs. As a result, he doesn't have to move the stick too much transitioning from level to an upline. it has pretty good flat torque.

I'd say it this way: If your style is slower, try the clipped 10W. if you like to move along a little faster during normal flight, use the regular 10. 

That's just my impressions right now. Note that I haven't tested these props on really hot, humid days, so I can't say for certain if it's too much load or not. Yet.

-Mike

PS it's also important to note that these props are too big for a normal TT 3" 120 cut spinner. Close, but you have to open up the cut outs slightly. At least I had to....
  ----- Original Message ----- 
  From: mike mueller 
  To: NSRCA Mailing List 
  Sent: Wednesday, November 15, 2006 1:04 PM
  Subject: Re: [NSRCA-discussion] APC 18.1 x 10W props


   In my case its just a touchy feely thing. I tend to base most things on it. Mike

  Bob Richards <bob at toprudder.com> wrote: 
    I'm curious about how one comes up with the best prop selection. In my case, it has always been a very subjective thing to determine the in-flight performance.

    Has anyone used any of the dataloggers to measure airspeed on up/down/level lines? IMHO, that would be one way to remove some of the subjectivity of in-flight performance. I think one of my christmas wish-list items is the Eagle Tree system.

    Bob R.


    mike mueller <mups1953 at yahoo.com> wrote:
       From my experience this is the best prop I have tried to date. I have mine on a YS160/Genesis. I was using Biela 3 bladed props,APC 4 bladed props and the 18x10.1 regular APC and this gives the best performance so far. Mike Mueller 

      "Dr. Mike Harrison" <drmikedds at sbcglobal.net> wrote: 
        Peter,
        Hi,
        I am Mike Harrison, I worked with APC to develop these props.  Let me tell you the goal of the prop design.  It is to fly at a moderate to slow constant speed under the noise limit but with good pulling performance.  Therefore, regarding the rpm, the 8000 is about ideal for that prop, turn it much more and you will be above the noise limit.  

        I find it interesting that you determine whether a prop is adequate by first tacking it.  I would think you would fly it first to see if it was adequate.  I would encourage you to do that first.  The OS 140 turns it about the same and it flies very well. 

        The whole purpose was to develop a prop that would fly at a deliberate pace at about 150 meters to compete with the electrics.  

        There is also an 18.5x9.5 which I fly and it turns about 7500 rpm.  I like it better than the 18.1x10.  I am working on a 19x9 at the moment.

        Good luck
        Mike
          From: Peter Pennisi 
          To: 'NSRCA Mailing List' 
          Sent: Tuesday, November 14, 2006 5:48 PM
          Subject: [NSRCA-discussion] APC 18.1 x 10W props


           
          I recently purchased some 18.1 x 10W APC props for my DZ160. Apparently there appears to be another version 18.1 x 10.1.
           
          Could someone please tell me the difference between both?
           
          I tried a quick ground run on this prop (stock) this morning but could barely get 8000 RPM from the engine. I will take advice from a member on this list and lop 1/4inch of each blade. What RPM readings are people getting who are using either of these props on a YS DZ160 engine?
           
           
          Regards,
           
          Peter 

----------------------------------------------------------------------

          _______________________________________________
          NSRCA-discussion mailing list
          NSRCA-discussion at lists.nsrca.org
          http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
        _______________________________________________
        NSRCA-discussion mailing list
        NSRCA-discussion at lists.nsrca.org
        http://lists.nsrca.org/mailman/listinfo/nsrca-discussion



--------------------------------------------------------------------------
      Sponsored Link

      Don't quit your job - take classes online and earn your degree in 1 year. Start Today_______________________________________________
      NSRCA-discussion mailing list
      NSRCA-discussion at lists.nsrca.org
      http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

    _______________________________________________
    NSRCA-discussion mailing list
    NSRCA-discussion at lists.nsrca.org
    http://lists.nsrca.org/mailman/listinfo/nsrca-discussion




------------------------------------------------------------------------------
  Sponsored Link

  Mortgage rates near 39yr lows. $310,000 Mortgage for $999/mo - Calculate new house payment


------------------------------------------------------------------------------


  _______________________________________________
  NSRCA-discussion mailing list
  NSRCA-discussion at lists.nsrca.org
  http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20061115/d3c4e210/attachment.html